Wintrust Financial (WTFC) 10-K 28 Feb 14 2013 FY Annual report Financial data

Document_And_Entity_Informatio

Document And Entity Information (USD $)	12 Months Ended
	Dec. 31, 2013	Feb. 21, 2014	Jun. 30, 2013
Document And Entity Information [Abstract]	'	'	'
Document Type	'10-K	'	'
Amendment Flag	'false	'	'
Document Period End Date	31-Dec-13	'	'
Document Fiscal Period Focus	'FY	'	'
Document Fiscal Year Focus	'2013	'	'
Trading Symbol	'WTFC	'	'
Entity Registrant Name	'WINTRUST FINANCIAL CORP	'	'
Entity Central Index Key	'0001015328	'	'
Current Fiscal Year End Date	'--12-31	'	'
Entity Filer Category	'Large Accelerated Filer	'	'
Entity Common Stock, Shares Outstanding	'	46,208,380	'
Entity Well-known Seasoned Issuer	'Yes	'	'
Entity Public Float	'	'	$1,419,767,800
Entity Current Reporting Status	'Yes	'	'
Entity Voluntary Filers	'No	'	'

Consolidated_Statements_Of_Con

Consolidated Statements Of Condition (USD $)	Dec. 31, 2013	Dec. 31, 2012
Assets	'	'
Cash and due from banks	$253,408,000	$284,731,000
Federal funds sold and securities purchased under resale agreements	10,456,000	30,297,000
Interest-bearing deposits with other banks	495,574,000	1,035,743,000
Available-for-sale securities, at fair value	2,176,290,000	1,796,076,000
Trading account securities	497,000	583,000
Federal Home Loan Bank and Federal Reserve Bank stock	79,261,000	79,564,000
Brokerage customer receivables	30,953,000	24,864,000
Mortgage loans held-for-sale, at fair value	332,485,000	385,033,000
Mortgage loans held-for-sale, at lower of cost or market	1,842,000	27,167,000
Loans, net of unearned income, excluding covered loans	12,896,602,000	11,828,943,000
Covered loans	346,431,000	560,087,000
Total loans	13,243,033,000	12,389,030,000
Less: Allowance for loan losses	96,922,000	107,351,000
Less: Allowance for covered loan losses	10,092,000	13,454,000
Net loans	13,136,019,000	12,268,225,000
Premises and equipment, net	531,947,000	501,205,000
FDIC indemnification asset	85,672,000	208,160,000
Accrued interest receivable and other assets	569,619,000	511,617,000
Goodwill	374,547,000	345,401,000
Other intangible assets	19,213,000	20,947,000
Total assets	18,097,783,000	17,519,613,000
Deposits:	'	'
Non-interest bearing	2,721,771,000	2,396,264,000
Interest bearing	11,947,018,000	12,032,280,000
Total deposits	14,668,789,000	14,428,544,000
Notes payable	364,000	2,093,000
Federal Home Loan Bank advances	417,762,000	414,122,000
Other borrowings	254,740,000	274,411,000
Secured borrowings - owed to securitization investors	0	0
Subordinated notes	0	15,000,000
Junior subordinated debentures	249,493,000	249,493,000
Trade date securities payable	303,088,000	0
Accrued interest payable and other liabilities	302,958,000	331,245,000
Total liabilities	16,197,194,000	15,714,908,000
Preferred stock, no par value; 20,000,000 shares authorized:	'	'
Common stock, no par value; $1.00 stated value; 100,000,000 shares authorized at December 31, 2013 and 2012; 46,181,588 shares and 37,107,684 shares issued at December 31, 2013 and 2012, respectively	46,181,000	37,108,000
Surplus	1,117,032,000	1,036,295,000
Treasury stock, at cost, 65,005 shares and 249,329 shares at December 31, 2013 and 2012, respectively	-3,000,000	-7,838,000
Retained earnings	676,935,000	555,023,000
Accumulated other comprehensive (loss) income	-63,036,000	7,711,000
Total shareholders' equity	1,900,589,000	1,804,705,000
Total liabilities and shareholders' equity	$18,097,783,000	$17,519,613,000

Consolidated_Statements_Of_Con1

Consolidated Statements Of Condition (Parenthetical) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
			Series A - $1,000 liquidation value; No shares issued and outstanding at December 31, 2013 and 50,000 shares issued and outstanding at December 31, 2012	Series A - $1,000 liquidation value; No shares issued and outstanding at December 31, 2013 and 50,000 shares issued and outstanding at December 31, 2012	Series C - $1,000 liquidation value; 126,477 and 126,500 shares issued and outstanding at December 31, 2013 and 2012, respectively	Series C - $1,000 liquidation value; 126,477 and 126,500 shares issued and outstanding at December 31, 2013 and 2012, respectively
Preferred stock, par value	$0	$0	'	'	'	'
Preferred stock, shares authorized	20,000,000	20,000,000	'	'	'	'
Preferred stock, liquidation value	'	'	$1,000	$1,000	$1,000	$1,000
Preferred stock, shares issued	126,477	176,500	0	50,000	126,477	126,500
Preferred stock, shares outstanding	126,477	176,500	0	50,000	126,477	126,500
Common stock, par value	$0	$0	'	'	'	'
Common stock, stated value	$1	$1	'	'	'	'
Common stock, shares authorized	100,000,000	100,000,000	'	'	'	'
Common stock, shares issued	46,181,588	37,107,684	'	'	'	'
Treasury stock, shares	65,005	249,329	'	'	'	'

Consolidated_Statements_Of_Inc

Consolidated Statements Of Income (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Interest income	'	'	'
Interest and fees on loans	$588,435	$583,872	$552,938
Interest bearing deposits with banks	1,644	1,552	3,419
Federal funds sold and securities purchased under resale agreements	27	38	116
Securities	37,025	38,134	46,219
Trading account securities	25	28	44
Federal Home Loan Bank and Federal Reserve Bank stock	2,773	2,550	2,297
Brokerage customer receivables	780	847	760
Total interest income	630,709	627,021	605,793
Interest expense	'	'	'
Interest on deposits	53,191	68,305	87,938
Interest on Federal Home Loan Bank advances	11,014	12,103	16,320
Interest on notes payable and other borrowings	4,341	8,966	11,023
Interest on secured borrowings - owed to securitization investors	0	5,087	12,113
Interest on subordinated notes	167	428	750
Interest on junior subordinated debentures	11,369	12,616	16,272
Total interest expense	80,082	107,505	144,416
Net interest income	550,627	519,516	461,377
Provision for credit losses	46,033	76,436	102,638
Net interest income after provision for credit losses	504,594	443,080	358,739
Non-interest income	'	'	'
Wealth management	63,042	52,680	44,517
Mortgage banking	106,857	109,970	56,942
Service charges on deposit accounts	20,366	16,971	14,963
(Losses) gains on available-for-sale securities, net	-3,000	4,895	1,792
Fees from covered call options	4,773	10,476	13,570
Gain on bargain purchases, net	0	7,503	37,974
Trading gains (losses), net	892	-1,900	337
Other	29,467	25,497	19,603
Total non-interest income	222,397	226,092	189,698
Non-interest expense	'	'	'
Salaries and employee benefits	308,794	288,589	237,785
Equipment	26,450	23,222	18,267
Occupancy, net	36,633	32,294	28,764
Data processing	18,672	15,739	14,568
Advertising and marketing	11,051	9,438	8,380
Professional fees	14,922	15,262	16,874
Amortization of other intangible assets	4,627	4,324	3,425
FDIC insurance	12,728	13,422	14,143
OREO expenses, net	5,834	22,103	26,340
Other	62,840	64,647	51,858
Total non-interest expense	502,551	489,040	420,404
Income before taxes	224,440	180,132	128,033
Income tax expense	87,230	68,936	50,458
Net income	137,210	111,196	77,575
Preferred stock dividends and discount accretion	8,395	9,093	4,128
Net income applicable to common shares	$128,815	$102,103	$73,447
Net income per common share - Basic (in usd per share)	$3.33	$2.81	$2.08
Net income per common share - Diluted (in usd per share)	$2.75	$2.31	$1.67
Cash dividends declared per common share (in usd per share)	$0.18	$0.18	$0.18
Weighted average common shares outstanding (in shares)	38,699	36,365	35,355
Dilutive potential common shares (in shares)	11,249	11,669	8,636
Average common shares and dilutive common shares (in shares)	49,948	48,034	43,991

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Comprehensive Income [Abstract]	'	'	'
Net income	$137,210	$111,196	$77,575
Unrealized (losses) gains on securities	'	'	'
Before tax	-102,790	8,793	4,467
Tax effect	40,608	-3,332	-1,862
Net of tax	-62,182	5,461	2,605
Less: Reclassification of net (losses) gains included in net income	'	'	'
Before tax	-3,000	4,895	1,792
Tax effect	1,193	-1,940	-712
Net of tax	-1,807	2,955	1,080
Net unrealized (losses) gains on securities	-60,375	2,506	1,525
Unrealized gains on derivative instruments	'	'	'
Before tax	4,702	2,960	1,690
Tax effect	-1,872	-1,170	-581
Net unrealized gains on derivative instruments	2,830	1,790	1,109
Foreign currency translation adjustment	'	'	'
Before tax	-17,564	8,249	0
Tax effect	4,362	-1,956	0
Net foreign currency translation adjustment	-13,202	6,293	0
Total other comprehensive (loss) income	-70,747	10,589	2,634
Comprehensive income	$66,463	$121,785	$80,209

Consolidated_Statements_Of_Cha

Consolidated Statements Of Changes In Shareholders' Equity (USD $)

Total

Preferred stock

Common stock

Surplus

Treasury stock

Retained earnings

Accumulated other comprehensive income (loss)

Series A Preferred Stock [Member]

Series A Preferred Stock [Member]

Series A Preferred Stock [Member]

Series A Preferred Stock [Member]

Series A Preferred Stock [Member]

Series A Preferred Stock [Member]

Series A Preferred Stock [Member]

Series C Preferred Stock [Member]

Series C Preferred Stock [Member]

Series C Preferred Stock [Member]

Series C Preferred Stock [Member]

Series C Preferred Stock [Member]

Series C Preferred Stock [Member]

Series C Preferred Stock [Member]

Preferred stock

Common stock

Surplus

Treasury stock

Retained earnings

Accumulated other comprehensive income (loss)

Preferred stock

Common stock

Surplus

Treasury stock

Retained earnings

Accumulated other comprehensive income (loss)

Balance at Dec. 31, 2010

$1,436,549,000

$49,640,000

$34,864,000

$965,203,000

$0

$392,354,000

($5,512,000)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Increase (Decrease) in Stockholders' Equity [Roll Forward]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net income

77,575,000

0

0

0

0

77,575,000

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Other comprehensive income (loss), net of tax

2,634,000

0

0

0

0

0

2,634,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Cash dividends declared on common stock

-6,344,000

0

0

0

0

-6,344,000

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Dividends on preferred stock

-4,000,000

0

0

0

0

-4,000,000

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Accretion on preferred stock

0

128,000

0

0

0

-128,000

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock repurchases

112,000

0

0

0

112,000

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock-based compensation

5,692,000

0

0

5,692,000

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock issued for:

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Acquisitions

26,486,000

0

883,000

25,603,000

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Exercise of stock options and warrants

1,590,000

0

86,000

1,504,000

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Restricted stock awards

-75,000

0

57,000

-132,000

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Employee stock purchase plan

2,099,000

0

67,000

2,032,000

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Director compensation plan

1,439,000

0

25,000

1,414,000

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Balance at Dec. 31, 2011

1,543,533,000

49,768,000

35,982,000

1,001,316,000

-112,000

459,457,000

-2,878,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Increase (Decrease) in Stockholders' Equity [Roll Forward]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net income

111,196,000

0

0

0

0

111,196,000

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Other comprehensive income (loss), net of tax

10,589,000

0

0

0

0

0

10,589,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Cash dividends declared on common stock

-6,537,000

0

0

0

0

-6,537,000

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Dividends on preferred stock

-8,955,000

0

0

0

0

-8,955,000

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Accretion on preferred stock

0

138,000

0

0

0

-138,000

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock-based compensation

-9,072,000

0

0

-9,072,000

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Issuance of Series C preferred stock

'

126,500,000

0

-3,810,000

0

0

0

'

'

'

'

'

'

'

122,690,000

'

'

'

'

'

'

Common stock issued for:

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Acquisitions

14,560,000

0

398,000

14,162,000

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Exercise of stock options and warrants

5,690,000

0

503,000

11,904,000

-6,717,000

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Restricted stock awards

-994,000

0

132,000

-117,000

-1,009,000

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Employee stock purchase plan

2,325,000

0

71,000

2,254,000

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Director compensation plan

1,536,000

0

22,000

1,514,000

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Balance at Dec. 31, 2012

1,804,705,000

176,406,000

37,108,000

1,036,295,000

-7,838,000

555,023,000

7,711,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Increase (Decrease) in Stockholders' Equity [Roll Forward]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net income

137,210,000

0

0

0

0

137,210,000

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Other comprehensive income (loss), net of tax

-70,747,000

0

0

0

0

0

-70,747,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Cash dividends declared on common stock

-6,903,000

0

0

0

0

-6,903,000

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Dividends on preferred stock

-8,325,000

0

0

0

0

-8,325,000

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Accretion on preferred stock

0

70,000

0

0

0

-70,000

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock-based compensation

6,799,000

0

0

6,799,000

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Conversion of Series _ preferred stock to common stock

'

'

'

'

'

'

'

0

-49,976,000

1,944,000

48,032,000

0

0

0

0

-23,000

1,000

22,000

0

0

0

Settlement of prepaid common stock purchase contracts

'

0

5,870,000

-14,212,000

8,342,000

0

0

'

'

'

'

'

'

'

0

'

'

'

'

'

'

Common stock issued for:

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Acquisitions

23,070,000

0

648,000

22,422,000

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Exercise of stock options and warrants

10,770,000

0

372,000

13,613,000

-3,215,000

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Restricted stock awards

38,000

0

145,000

182,000

-289,000

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Employee stock purchase plan

2,459,000

0

62,000

2,397,000

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Director compensation plan

1,513,000

0

31,000

1,482,000

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Balance at Dec. 31, 2013

$1,900,589,000

$126,477,000

$46,181,000

$1,117,032,000

($3,000,000)

$676,935,000

($63,036,000)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Consolidated_Statements_Of_Cas

Consolidated Statements Of Cash Flows (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Activities:	'	'	'
Net income	$137,210,000	$111,196,000	$77,575,000
Adjustments to reconcile net income to net cash provided by operating activities:	'	'	'
Provision for credit losses	46,033,000	76,436,000	102,638,000
Depreciation and amortization	26,180,000	24,676,000	19,469,000
Deferred income tax expense (benefit)	1,539,000	-23,315,000	-639,000
Stock-based compensation expense	6,799,000	9,072,000	5,692,000
Tax (expense) benefit from stock-based compensation arrangements	-831,000	1,392,000	129,000
Excess tax benefits from stock-based compensation arrangements	-474,000	-841,000	-306,000
Net amortization (accretion) of premium on securities	-2,934,000	1,034,000	-4,434,000
Mortgage servicing rights fair value change, net	-1,739,000	4,101,000	4,673,000
Originations and purchases of mortgage loans held-for-sale	-3,708,364,000	-3,866,012,000	-2,545,385,000
Proceeds from sales of mortgage loans held-for-sale	3,862,030,000	3,865,863,000	2,638,162,000
Bank owned life insurance income, net of claims	-3,446,000	-2,920,000	-2,569,000
Decrease in trading securities, net	86,000	1,907,000	2,389,000
Net (increase) decrease in brokerage customer receivables	6,089,000	-3,061,000	3,376,000
Gain on mortgage loans sold	-75,793,000	-91,527,000	-41,854,000
Losses (gains) on available-for-sale securities, net	-3,000,000	4,895,000	1,792,000
Gain on bargain purchases, net	0	-7,503,000	-37,974,000
Loss on sales of premises and equipment, net	23,000	333,000	29,000
Net loss on sales and fair value adjustments of other real estate owned	136,000	15,316,000	20,110,000
Decrease in accrued interest receivable and other assets, net	54,300,000	15,605,000	12,582,000
(Decrease) increase in accrued interest payable and other liabilities, net	-21,749,000	137,743,000	-9,720,000
Net Cash Provided by Operating Activities	321,785,000	268,654,000	244,267,000
Investing Activities:	'	'	'
Proceeds from maturities of available-for-sale securities	295,807,000	588,281,000	1,483,986,000
Proceeds from sales of available-for-sale securities	138,274,000	2,399,035,000	1,265,046,000
Purchases of available-for-sale securities	-489,131,000	-2,570,373,000	-3,087,864,000
Net cash (paid) received for acquisitions	14,491,000	-64,351,000	-91,571,000
Divestiture of operations	-149,100,000	0	0
Proceeds from sales of other real estate owned	100,162,000	88,633,000	59,076,000
Proceeds received from the FDIC related to reimbursement on covered assets	53,443,000	169,689,000	92,595,000
Net decrease (increase) in interest-bearing deposits with banks	643,626,000	-212,564,000	140,684,000
Net increase in loans	-781,693,000	-948,601,000	-802,926,000
Purchases of premises and equipment, net	-37,694,000	-74,326,000	-79,132,000
Net Cash Used for Investing Activities	-240,797,000	-495,875,000	-836,964,000
Financing Activities:	'	'	'
(Decrease) increase in deposit accounts	-78,946,000	1,251,792,000	385,335,000
(Decrease) increase in other borrowings, net	-22,396,000	-306,786,000	226,050,000
Decrease in Federal Home Loan Bank advances, net	-18,000,000	-70,000,000	0
Repayment of subordinated notes	15,000,000	20,000,000	15,000,000
Payoff of secured borrowing	0	-600,000,000	0
Excess tax benefits from stock-based compensation arrangements	474,000	841,000	306,000
Net proceeds from issuance of Series C preferred stock	0	122,690,000	0
Issuance of common shares resulting from exercise of stock options, employee stock purchase plan and conversion of common stock warrants	19,113,000	14,891,000	3,586,000
Common stock repurchases	-3,504,000	-7,726,000	-112,000
Dividends paid	-13,893,000	-13,157,000	-10,344,000
Net Cash (Used for) Provided by Financing Activities	-132,152,000	372,545,000	589,821,000
Net (Decrease) Increase in Cash and Cash Equivalents	-51,164,000	145,324,000	-2,876,000
Cash and Cash Equivalents at Beginning of Period	315,028,000	169,704,000	172,580,000
Cash and Cash Equivalents at End of Period	263,864,000	315,028,000	169,704,000
Cash paid during the year for:	'	'	'
Interest	83,395,000	109,173,000	146,982,000
Income taxes, net	97,703,000	82,067,000	57,474,000
Acquisitions:	'	'	'
Fair value of assets acquired, including cash and cash equivalents	559,694,000	1,158,925,000	1,257,085,000
Value ascribed to goodwill and other intangible assets	35,056,000	42,588,000	37,198,000
Fair value of liabilities assumed	511,603,000	1,160,084,000	1,220,189,000
Non-cash activities	'	'	'
Transfer to other real estate owned from loans	81,526,000	30,651,000	59,669,000
Common stock issued for acquisitions	$23,070,000	$14,560,000	$27,091,000

Summary_Of_Significant_Account

Summary Of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Summary of Significant Accounting Policies	'
	Summary of Significant Accounting Policies
	The accounting and reporting policies of Wintrust and its subsidiaries conform to generally accepted accounting principles in the United States and prevailing practices of the banking industry. In the preparation of the consolidated financial statements, management is required to make certain estimates and assumptions that affect the reported amounts contained in the consolidated financial statements. Management believes that the estimates made are reasonable; however, changes in estimates may be required if economic or other conditions change beyond management’s expectations. Reclassifications of certain prior year amounts have been made to conform to the current year presentation. The following is a summary of the Company’s more significant accounting policies.
	Principles of Consolidation
	The consolidated financial statements of Wintrust include the accounts of the Company and its subsidiaries. All significant intercompany accounts and transactions have been eliminated in the consolidated financial statements.
	Earnings per Share
	Basic earnings per share is computed by dividing income available to common shareholders by the weighted-average number of common shares outstanding for the period. Diluted earnings per share reflects the potential dilution that would occur if securities or other contracts to issue common stock were exercised or converted into common stock or resulted in the issuance of common stock that then shared in the earnings of the Company. The weighted-average number of common shares outstanding is increased by the assumed conversion of outstanding convertible preferred stock and tangible equity unit shares from the beginning of the year or date of issuance, if later, and the number of common shares that would be issued assuming the exercise of stock options, the issuance of restricted shares and stock warrants using the treasury stock method. The adjustments to the weighted-average common shares outstanding are only made when such adjustments will dilute earnings per common share. Net income applicable to common shares used in the diluted earnings per share calculation can be affected by the conversion of the Company's preferred stock. Where the effect of this conversion would reduce the loss per share or increase the income per share, net income applicable to common shares is not adjusted by the associated preferred dividends.
	Business Combinations
	The Company accounts for business combinations under the acquisition method of accounting in accordance with ASC 805, “Business Combinations” (“ASC 805”). The Company recognizes the full fair value of the assets acquired and liabilities assumed, immediately expenses transaction costs and accounts for restructuring plans separately from the business combination. There is no separate recognition of the acquired allowance for loan losses on the acquirer’s balance sheet as credit related factors are incorporated directly into the fair value of the loans recorded at the acquisition date. The excess of the cost of the acquisition over the fair value of the net tangible and intangible assets acquired is recorded as goodwill. Alternatively, a gain is recorded equal to the amount by which the fair value of assets purchased exceeds the fair value of liabilities assumed and consideration paid.
	Results of operations of the acquired business are included in the income statement from the effective date of acquisition.
	Cash Equivalents
	For purposes of the consolidated statements of cash flows, Wintrust considers cash on hand, cash items in the process of collection, non-interest bearing amounts due from correspondent banks, federal funds sold and securities purchased under resale agreements with original maturities of three months or less, to be cash equivalents.
	Securities
	The Company classifies securities upon purchase in one of three categories: trading, held-to-maturity, or available-for-sale. Debt and equity securities held for resale are classified as trading securities. Debt securities for which the Company has the ability and positive intent to hold until maturity are classified as held-to-maturity. All other securities are classified as available-for-sale as they may be sold prior to maturity in response to changes in the Company’s interest rate risk profile, funding needs, demand for collateralized deposits by public entities or other reasons.
	Held-to-maturity securities are stated at amortized cost, which represents actual cost adjusted for premium amortization and discount accretion using methods that approximate the effective interest method. Available-for-sale securities are stated at fair value, with unrealized gains and losses, net of related taxes, included in shareholders’ equity as a separate component of other comprehensive income.
	Trading account securities are stated at fair value. Realized and unrealized gains and losses from sales and fair value adjustments are included in other non-interest income.
	Declines in the fair value of investment securities available for sale (with certain exceptions for debt securities noted below) that are deemed to be other-than-temporary are charged to earnings as a realized loss, and a new cost basis for the securities is established. In evaluating other-than-temporary impairment, management considers the length of time and extent to which the fair value has been less than cost, the financial condition and near-term prospects of the issuer, and the intent and ability of the Corporation to retain its investment in the issuer for a period of time sufficient to allow for any anticipated recovery in fair value in the near term. Declines in the fair value of debt securities below amortized cost are deemed to be other-than-temporary in circumstances where: (1) the Corporation has the intent to sell a security; (2) it is more likely than not that the Corporation will be required to sell the security before recovery of its amortized cost basis; or (3) the Corporation does not expect to recover the entire amortized cost basis of the security. If the Corporation intends to sell a security or if it is more likely than not that the Corporation will be required to sell the security before recovery, an other-than-temporary impairment write-down is recognized in earnings equal to the difference between the security’s amortized cost basis and its fair value. If an entity does not intend to sell the security or it is not more likely than not that it will be required to sell the security before recovery, the other-than-temporary impairment write-down is separated into an amount representing credit loss, which is recognized in earnings, and an amount related to all other factors, which is recognized in other comprehensive income.
	Interest and dividends, including amortization of premiums and accretion of discounts, are recognized as interest income when earned. Realized gains and losses on sales (using the specific identification method) and declines in value judged to be other-than-temporary are included in non-interest income.
	Federal Home Loan Bank and Federal Reserve Bank Stock
	Investments in Federal Home Loan Bank and Federal Reserve Bank stock are restricted as to redemption and are carried at cost.
	Securities Purchased Under Resale Agreements and Securities Sold Under Repurchase Agreements
	Securities purchased under resale agreements and securities sold under repurchase agreements are generally treated as collateralized financing transactions and are recorded at the amount at which the securities were acquired or sold plus accrued interest. Securities, generally U.S. government and Federal agency securities, pledged as collateral under these financing arrangements cannot be sold by the secured party. The fair value of collateral either received from or provided to a third party is monitored and additional collateral is obtained or requested to be returned as deemed appropriate.
	Brokerage Customer Receivables
	The Company, under an agreement with an out-sourced securities clearing firm, extends credit to its brokerage customers to finance their purchases of securities on margin. The Company receives income from interest charged on such extensions of credit. Brokerage customer receivables represent amounts due on margin balances. Securities owned by customers are held as collateral for these receivables.
	Mortgage Loans Held-for-Sale
	Mortgage loans are classified as held-for-sale when originated or acquired with the intent to sell the loan into the secondary market. Market conditions or other developments may change management’s intent with respect to the disposition of these loans and loans previously classified as mortgage loans held-for-sale may be reclassified to the loan portfolio.
	ASC 825, “Financial Instruments” provides entities with an option to report selected financial assets and liabilities at fair value. Mortgage loans originated by Wintrust Mortgage are measured at fair value which is determined by reference to investor prices for loan products with similar characteristics. Changes in fair value are recognized in mortgage banking revenue.
	Loans, Allowance for Loan Losses, Allowance for Covered Loan Losses and Allowance for Losses on Lending-Related Commitments
	Loans are generally reported at the principal amount outstanding, net of unearned income. Interest income is recognized when earned. Loan origination fees and certain direct origination costs are deferred and amortized over the expected life of the loan as an adjustment to the yield using methods that approximate the effective interest method. Finance charges on premium finance receivables are earned over the term of the loan, using a method which approximates the effective yield method.
	Interest income is not accrued on loans where management has determined that the borrowers may be unable to meet contractual principal and/or interest obligations, or where interest or principal is 90 days or more past due, unless the loans are adequately secured and in the process of collection. Cash receipts on non-accrual loans are generally applied to the principal balance until the remaining balance is considered collectible, at which time interest income may be recognized when received.
	The Company maintains its allowance for loan losses at a level believed appropriate by management to absorb probable losses inherent in the loan portfolio and is based on the size and current risk characteristics of the loan portfolio, an assessment of internal problem loan reporting system loans and actual loss experience, changes in the composition of the loan portfolio, historical loss experience, changes in lending policies and procedures, including underwriting standards and collections, charge-off and recovery practices, changes in experience, ability and depth of lending management and staff, changes in national and local economic and business conditions and developments, including the condition of various market segments and changes in the volume and severity of past due and classified loans and trends in the volume of non-accrual loans, troubled debt restructurings and other loan modifications. The allowance for loan losses also includes an element for estimated probable but undetected losses and for imprecision in the credit risk models used to calculate the allowance. Loans with a credit risk rating of a 6 through 9 are reviewed on a monthly basis to determine if (a) an amount is deemed uncollectible (a charge-off) or (b) it is probable that the Company will be unable to collect amounts due in accordance with the original contractual terms of the loan (an impaired loan). If a loan is impaired, the carrying amount of the loan is compared to the expected payments to be received, discounted at the loan’s original rate, or for collateral dependent loans, to the fair value of the collateral less the estimated cost to sell. Any shortfall is recorded as a specific reserve. For loans with a credit risk rating of 7 or better, reserves are established based on the type of loan collateral, if any, and the assigned credit risk rating. Determination of the allowance is inherently subjective as it requires significant estimates, including the amounts and timing of expected future cash flows on impaired loans, estimated losses on pools of homogeneous loans based on the average historical loss experience over a three year period, and consideration of current environmental factors and economic trends, all of which may be susceptible to significant change. Loan losses are charged off against the allowance, while recoveries are credited to the allowance. A provision for credit losses is charged to operations based on management’s periodic evaluation of the factors previously mentioned, as well as other pertinent factors. Evaluations are conducted at least quarterly and more frequently if deemed necessary.
	Under accounting guidance applicable to loans acquired with evidence of credit quality deterioration since origination, the excess of cash flows expected at acquisition over the estimated fair value is referred to as the accretable yield and is recognized in interest income over the remaining estimated life of the loans, using the effective-interest method. The difference between contractually required payments at acquisition and the cash flows expected to be collected at acquisition is referred to as the nonaccretable difference. Changes in the expected cash flows from the date of acquisition will either impact the accretable yield or result in a charge to the provision for credit losses. Subsequent decreases to expected principal cash flows will result in a charge to provision for credit losses and a corresponding increase to allowance for loan losses. Subsequent increases in expected principal cash flows will result in recovery of any previously recorded allowance for loan losses, to the extent applicable, and a reclassification from nonaccretable difference to accretable yield for any remaining increase. All changes in expected interest cash flows, including the impact of prepayments, will result in reclassifications to/from nonaccretable differences.
	In estimating expected losses, the Company evaluates loans for impairment in accordance ASC 310, “Receivables.” A loan is considered impaired when, based on current information and events, it is probable that a creditor will be unable to collect all amounts due pursuant to the contractual terms of the loan. Impaired loans include non-accrual loans, restructured loans or loans with principal and/or interest at risk, even if the loan is current with all payments of principal and interest. Impairment is measured by estimating the fair value of the loan based on the present value of expected cash flows, the market price of the loan, or the fair value of the underlying collateral less costs to sell. If the estimated fair value of the loan is less than the recorded book value, a valuation allowance is established as a component of the allowance for loan losses. For restructured loans in which impairment is calculated by the present value of future cash flows, the Company records interest income representing the decrease in impairment resulting from the passage of time during the respective period, which differs from interest income from contractually required interest on these specific loans.
	The Company also maintains an allowance for lending-related commitments, specifically unfunded loan commitments and letters of credit, to provide for the risk of loss inherent in these arrangements. The allowance is computed using a methodology similar to that used to determine the allowance for loan losses. This allowance is included in other liabilities on the statement of condition while the corresponding provision for these losses is recorded as a component of the provision for credit losses.
	Mortgage Servicing Rights
	Mortgage Servicing Rights (“MSRs”) are recorded in the Consolidated Statements of Condition at fair value in accordance with ASC 860, “Transfers and Servicing.” The Company originates mortgage loans for sale to the secondary market, the majority of which are sold without retaining servicing rights. There are certain loans, however, that are originated and sold with servicing rights retained. MSRs associated with loans originated and sold, where servicing is retained, are capitalized at the time of sale at fair value based on the future net cash flows expected to be realized for performing the servicing activities, and included in other assets in the Consolidated Statements of Condition. The change in the fair value of MSRs is recorded as a component of mortgage banking revenue in non-interest income in the Consolidated Statements of Income. For purposes of measuring fair value, a third party valuation is obtained. This valuation stratifies the servicing rights into pools based on homogenous characteristics, such as product type and interest rate. The fair value of each servicing rights pool is calculated based on the present value of estimated future cash flows using a discount rate commensurate with the risk associated with that pool, given current market conditions. Estimates of fair value include assumptions about prepayment speeds, interest rates and other factors which are subject to change over time. Changes in these underlying assumptions could cause the fair value of MSRs to change significantly in the future.
	Premises and Equipment
	Premises and equipment are stated at cost less accumulated depreciation and amortization. Depreciation and amortization are computed using the straight-line method over the estimated useful lives of the related assets. Useful lives range from two to ten years for furniture, fixtures and equipment, two to five years for software and computer-related equipment and seven to 39 years for buildings and improvements. Land improvements are amortized over a period of 15 years and leasehold improvements are amortized over the shorter of the useful life of the improvement or the term of the respective lease. Land and antique furnishings and artwork are not subject to depreciation. Expenditures for major additions and improvements are capitalized, and maintenance and repairs are charged to expense as incurred. Internal costs related to the configuration and installation of new software and the modification of existing software that provides additional functionality are capitalized.
	Long-lived depreciable assets are evaluated periodically for impairment when events or changes in circumstances indicate the carrying amount may not be recoverable. Impairment exists when the expected undiscounted future cash flows of a long-lived asset are less than its carrying value. In that event, a loss is recognized for the difference between the carrying value and the estimated fair value of the asset based on a quoted market price, if applicable, or a discounted cash flow analysis. Impairment losses are recognized in other non-interest expense.
	FDIC Indemnification Asset
	In conjunction with FDIC-assisted transactions, the Company entered into loss share agreements with the FDIC. These agreements cover realized losses on loans, foreclosed real estate and certain other assets. These loss share assets are measured separately from the loan portfolios because they are not contractually embedded in the loans and are not transferable with the loans should the Company choose to dispose of them. Fair values at the acquisition dates were estimated based on projected cash flows available for loss-share based on the credit adjustments estimated for each loan pool and the loss share percentages. The loss share assets are also separately measured from the related loans and foreclosed real estate and recorded as FDIC indemnification assets on the Consolidated Statements of Condition. Subsequent to the acquisition date, reimbursements received from the FDIC for actual incurred losses will reduce the loss share assets. Reductions to expected losses, to the extent such reductions to expected losses are the result of an improvement to the actual or expected cash flows from the covered assets, will also reduce the loss share assets. Additional expected losses, to the extent such expected losses result in the recognition of an allowance for loan losses, will increase the loss share assets. The corresponding accretion is recorded as a component of non-interest income on the Consolidated Statements of Income. Although these assets are contractual receivables from the FDIC, there are no contractual interest rates.
	Other Real Estate Owned
	Other real estate owned is comprised of real estate acquired in partial or full satisfaction of loans and is included in other assets. Other real estate owned is recorded at its estimated fair value less estimated selling costs at the date of transfer, with any excess of the related loan balance over the fair value less expected selling costs charged to the allowance for loan losses. Subsequent changes in value are reported as adjustments to the carrying amount and are recorded in other non-interest expense. Gains and losses upon sale, if any, are also charged to other non-interest expense.
	Goodwill and Other Intangible Assets
	Goodwill represents the excess of the cost of an acquisition over the fair value of net assets acquired. Other intangible assets represent purchased assets that also lack physical substance but can be distinguished from goodwill because of contractual or other legal rights or because the asset is capable of being sold or exchanged either on its own or in combination with a related contract, asset or liability. In accordance with accounting standards, goodwill is not amortized, but rather is tested for impairment on an annual basis or more frequently when events warrant, using a qualitative or quantitative approach. Intangible assets which have finite lives are amortized over their estimated useful lives and also are subject to impairment testing. All of the Company’s other intangible assets have finite lives and are amortized over varying periods not exceeding twenty years.
	Bank-Owned Life Insurance
	The Company owns BOLI on certain executives. BOLI balances are recorded at their cash surrender values and are included in other assets. Changes in the cash surrender values are included in non-interest income. At December 31, 2013 and 2012, BOLI totaled $118.5 million and $104.6 million, respectively.
	Derivative Instruments
	The Company enters into derivative transactions principally to protect against the risk of adverse price or interest rate movements on the future cash flows or the value of certain assets and liabilities. The Company is also required to recognize certain contracts and commitments, including certain commitments to fund mortgage loans held-for-sale, as derivatives when the characteristics of those contracts and commitments meet the definition of a derivative. The Company accounts for derivatives in accordance with ASC 815, “Derivatives and Hedging”, which requires that all derivative instruments be recorded in the statement of condition at fair value. The accounting for changes in the fair value of a derivative instrument depends on whether it has been designated and qualifies as part of a hedging relationship and further, on the type of hedging relationship.
	Derivative instruments designated in a hedge relationship to mitigate exposure to changes in the fair value of an asset or liability attributable to a particular risk, such as interest rate risk, are considered fair value hedges. Derivative instruments designated in a hedge relationship to mitigate exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges. Formal documentation of the relationship between a derivative instrument and a hedged asset or liability, as well as the risk-management objective and strategy for undertaking each hedge transaction and an assessment of effectiveness is required at inception to apply hedge accounting. In addition, formal documentation of ongoing effectiveness testing is required to maintain hedge accounting.
	Fair value hedges are accounted for by recording the changes in the fair value of the derivative instrument and the changes in the fair value related to the risk being hedged of the hedged asset or liability on the statement of condition with corresponding offsets recorded in the income statement. The adjustment to the hedged asset or liability is included in the basis of the hedged item, while the fair value of the derivative is recorded as a freestanding asset or liability. Actual cash receipts or payments and related amounts accrued during the period on derivatives included in a fair value hedge relationship are recorded as adjustments to the interest income or expense recorded on the hedged asset or liability.
	Cash flow hedges are accounted for by recording the changes in the fair value of the derivative instrument on the statement of condition as either a freestanding asset or liability, with a corresponding offset recorded in other comprehensive income within shareholders’ equity, net of deferred taxes. Amounts are reclassified from accumulated other comprehensive income to interest expense in the period or periods the hedged forecasted transaction affects earnings.
	Under both the fair value and cash flow hedge scenarios, changes in the fair value of derivatives not considered to be highly effective in hedging the change in fair value or the expected cash flows of the hedged item are recognized in earnings as non-interest income during the period of the change.
	Derivative instruments that are not designated as hedges according to accounting guidance are reported on the statement of condition at fair value and the changes in fair value are recognized in earnings as non-interest income during the period of the change.
	Commitments to fund mortgage loans (interest rate locks) to be sold into the secondary market and forward commitments for the future delivery of these mortgage loans are accounted for as derivatives and are not designated in hedging relationships. Fair values of these mortgage derivatives are estimated based on changes in mortgage rates from the date of the commitments. Changes in the fair values of these derivatives are included in mortgage banking revenue.
	Forward currency contracts used to manage foreign exchange risk associated with certain foreign currency denominated assets are accounted for as derivatives and are not designated in hedging relationships. Foreign currency derivatives are recorded at fair value based on prevailing currency exchange rates at the measurement date. Changes in the fair values of these derivatives resulting from fluctuations in currency rates are recognized in earnings as non-interest income during the period of change.
	Periodically, the Company sells options to an unrelated bank or dealer for the right to purchase certain securities held within the banks’ investment portfolios (“covered call options”). These option transactions are designed primarily as an economic hedge to increase the total return associated with holding these securities as earning assets. These transactions are not designated in hedging relationships pursuant to accounting guidance and, accordingly, changes in fair values of these contracts, are reported in other non-interest income.
	Trust Assets, Assets Under Management and Brokerage Assets
	Assets held in fiduciary or agency capacity for customers are not included in the consolidated financial statements as they are not assets of Wintrust or its subsidiaries. Fee income is recognized on an accrual basis and is included as a component of non-interest income.
	Income Taxes
	Wintrust and its subsidiaries file a consolidated Federal income tax return. Income tax expense is based upon income in the consolidated financial statements rather than amounts reported on the income tax return. Deferred tax assets and liabilities are recognized for the estimated future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using currently enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized as an income tax benefit or income tax expense in the period that includes the enactment date.
	Positions taken in the Company’s tax returns may be subject to challenge by the taxing authorities upon examination. In accordance with applicable accounting guidance, uncertain tax positions are initially recognized in the financial statements when it is more likely than not the positions will be sustained upon examination by the tax authorities. Such tax positions are both initially and subsequently measured as the largest amount of tax benefit that is greater than 50% likely being realized upon settlement with the tax authority, assuming full knowledge of the position and all relevant facts. Interest and penalties on income tax uncertainties are classified within income tax expense in the income statement.
	Stock-Based Compensation Plans
	In accordance with ASC 718, “Compensation — Stock Compensation”, compensation cost is measured as the fair value of the awards on their date of grant. A Black-Scholes model is utilized to estimate the fair value of stock options and the market price of the Company’s stock at the date of grant is used to estimate the fair value of restricted stock awards. Compensation cost is recognized over the required service period, generally defined as the vesting period. For awards with graded vesting, compensation cost is recognized on a straight-line basis over the requisite service period for the entire award.
Accounting guidance requires the recognition of stock based compensation for the number of awards that are ultimately expected to vest. As a result, recognized compensation expense for stock options and restricted share awards is reduced for estimated forfeitures prior to vesting. Forfeitures rates are estimated for each type of award based on historical forfeiture experience. Estimated forfeitures will be reassessed in subsequent periods and may change based on new facts and circumstances.
The Company issues new shares to satisfy option exercises and vesting of restricted shares.
Comprehensive Income
Comprehensive income consists of net income and other comprehensive income. Other comprehensive income includes unrealized gains and losses on securities available-for-sale, net of deferred taxes, adjustments related to cash flow hedges, net of deferred taxes and foreign currency translation adjustments, net of taxes.
Stock Repurchases
The Company periodically repurchases shares of its outstanding common stock through open market purchases or other methods. Repurchased shares are recorded as treasury shares on the trade date using the treasury stock method, and the cash paid is recorded as treasury stock.
Foreign Currency Translation
The Company revalues assets, liabilities, revenue and expense denominated in non-U.S. currencies into U.S. dollars at the end of each month using applicable exchange rates.
Gains and losses relating to translating functional currency financial statements for U.S. reporting are included in other comprehensive income. Gains and losses relating to nonfunctional currency transactions are reported in the Consolidated Statements of Income.

Recent_Accounting_Pronouncemen

Recent Accounting Pronouncements	12 Months Ended
	Dec. 31, 2013
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]	'
Recent Accounting Pronouncements	'
	Recent Accounting Pronouncements
	Repossession of Residential Real Estate Collateral
	In January 2014, the FASB issued ASU No. 2014-04, “Receivables - Troubled Debt Restructurings by Creditors (Topic 310-40): Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure,” to address diversity in practice and clarify guidance regarding the accounting for an in-substance repossession or foreclosure of residential real estate collateral. This ASU clarifies that an in-substance repossession or foreclosure occurs upon either the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure or the borrower conveying all interest in the residential real estate property to the creditor. Additionally, this ASU requires disclosure of both the amount of foreclosed residential real estate property held by the Company and the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure. This guidance is effective for fiscal years beginning after December 15, 2014. Other than requiring additional disclosures, the Company does not expect adoption of this guidance to have a material impact on the Company’s consolidated financial statements.

AvailableForSale_Securities

Available-For-Sale Securities	12 Months Ended
	Dec. 31, 2013
Available-for-sale Securities [Abstract]	'
Available-for-Sale Securities	'
	Available-for-Sale Securities
	A summary of the available-for-sale securities portfolio presenting carrying amounts and gross unrealized gains and losses as of December 31, 2013 and 2012 is as follows:
			December 31, 2013												31-Dec-12
	(Dollars in thousands)		Amortized			Gross			Gross			Fair Value			Amortized		Gross			Gross			Fair Value
			Cost			unrealized			unrealized						Cost		unrealized			unrealized
						gains			losses								gains			losses
	U.S. Treasury		$	354,262		$	141		$	(18,308	)	$	336,095		$	220,226	$	198		$	(937	)	$	219,487
	U.S. Government agencies		950,086			1,680			(56,078		)	895,688			986,186		4,839			(986		)	990,039
	Municipal		154,463			2,551			(4,298		)	152,716			107,868		2,899			(296		)	110,471
	Corporate notes:
	Financial issuers		129,362			1,993			(2,411		)	128,944			142,205		2,452			(3,982		)	140,675
	Other		5,994			105			(5		)	6,094			13,911		220			—			14,131
	Mortgage-backed: (1)
	Mortgage-backed securities		562,708			3,537			(18,047		)	548,198			188,485		8,805			(30		)	197,260
	Collateralized mortgage obligations		57,711			258			(942		)	57,027			73,386		928			—			74,314
	Other equity securities		50,532			1,493			(497		)	51,528			52,846		215			(3,362		)	49,699
	Total available-for-sale securities		$	2,265,118		$	11,758		$	(100,586	)	$	2,176,290		$	1,785,113	$	20,556		$	(9,593	)	$	1,796,076
	-1	Consisting entirely of residential mortgage-backed securities, none of which are subprime.
	The following table presents the portion of the Company’s available-for-sale securities portfolio which has gross unrealized losses, reflecting the length of time that individual securities have been in a continuous unrealized loss position at December 31, 2013:
			Continuous unrealized						Continuous unrealized						Total
			losses existing for less						losses existing for
			than 12 months						greater than 12 months
	(Dollars in thousands)		Fair value			Unrealized			Fair value			Unrealized			Fair value		Unrealized
						losses						losses					losses
	U.S. Treasury		$	75,695		$	(62	)	$	181,922		$	(18,246	)	$	257,617	$	(18,308	)
	U.S. Government agencies		399,982			(47,860		)	53,431			(8,218		)	453,413		(56,078		)
	Municipal		66,368			(3,757		)	10,529			(541		)	76,897		(4,298		)
	Corporate notes:
	Financial issuers		21,296			(49		)	66,834			(2,362		)	88,130		(2,411		)
	Other		995			(5		)	—			—			995		(5		)
	Mortgage-backed:
	Mortgage-backed securities		270,522			(18,008		)	2,922			(39		)	273,444		(18,047		)
	Collateralized mortgage obligations		40,449			(942		)	—			—			40,449		(942		)
	Other equity securities		8,272			(205		)	5,709			(292		)	13,981		(497		)
	Total		$	883,579		$	(70,888	)	$	321,347		$	(29,698	)	$	1,204,926	$	(100,586	)
	The following table presents the portion of the Company’s available-for-sale securities portfolio which has gross unrealized losses, reflecting the length of time that individual securities have been in a continuous unrealized loss position at December 31, 2012:
			Continuous unrealized						Continuous unrealized						Total
			losses existing for less						losses existing for
			than 12 months						greater than 12 months
	(Dollars in thousands)		Fair value			Unrealized			Fair			Unrealized			Fair value		Unrealized
						losses			value			losses					losses
	U.S. Treasury		$	199,250		$	(937	)	$	—		$	—		$	199,250	$	(937	)
	U.S. Government agencies		200,408			(986		)	—			—			200,408		(986		)
	Municipal		26,782			(295		)	512			(1		)	27,294		(296		)
	Corporate notes:
	Financial issuers		4,644			(13		)	91,970			(3,969		)	96,614		(3,982		)
	Other		—			—			—			—			—		—
	Mortgage-backed:
	Mortgage-backed securities		20,198			(30		)	—			—			20,198		(30		)
	Collateralized mortgage obligations		—			—			—			—			—		—
	Other equity securities		5,960			(40		)	22,078			(3,322		)	28,038		(3,362		)
	Total		$	457,242		$	(2,301	)	$	114,560		$	(7,292	)	$	571,802	$	(9,593	)
	The Company conducts a regular assessment of its investment securities to determine whether securities are other-than-temporarily impaired considering, among other factors, the nature of the securities, credit ratings or financial condition of the issuer, the extent and duration of the unrealized loss, expected cash flows, market conditions and the Company’s ability to hold the securities through the anticipated recovery period.
	The Company does not consider securities with unrealized losses at December 31, 2013 to be other-than-temporarily impaired. The Company does not intend to sell these investments and it is more likely than not that the Company will not be required to sell these investments before recovery of the amortized cost bases, which may be the maturity dates of the securities. The unrealized losses within each category have occurred as a result of changes in interest rates, market spreads and market conditions subsequent to purchase. Securities with continuous unrealized losses existing for more than twelve months were primarily treasury notes, corporate securities of financial issuers, and agency bonds. Unrealized losses recognized on treasury notes and agency bonds are the result of increases in yields for similar types of securities which have a longer duration and maturity. The unrealized losses on corporate securities of financial issuers were comprised primarily of three trust-preferred securities. These securities continue to make contractual interest payments and have issuers with strong capital ratios.
	In the fourth quarter of 2013, the Company recorded an other-than-temporary impairment charge related to a money market preferred security. The Company recognized this charge because it estimated that it would not be able to recover its amortized basis prior to its anticipated sale of the security as a result of the Volcker Rule.
	The following table provides information as to the amount of gross gains and gross losses realized, other-than-temporary impairment charges and proceeds received through the sales of available-for-sale investment securities:
			Years Ended December 31,
	(Dollars in thousands)		2013			2012			2011
	Realized gains		$	434		$	4,918		$	1,874
	Realized losses		(106		)	(23		)	(82		)
	Net realized gains		$	328		$	4,895		$	1,792
	Other than temporary impairment charges		(3,328		)	—			—
	(Losses) gains on available-for-sale securities, net		$	(3,000	)	$	4,895		$	1,792
Proceeds from sales of available-for-sale securities, net		$	138,274		$	2,399,035		$	1,265,046
Net losses on available-for-sale securities resulted in an income tax benefit included in total income tax expense of $1.2 million in 2013. Net gains on available-for-sale securities resulted in income tax expense of $1.9 million in 2012 and $705,000 in 2011.
The amortized cost and fair value of securities as of December 31, 2013 and December 31, 2012, by contractual maturity, are shown in the following table. Contractual maturities may differ from actual maturities as borrowers may have the right to call or repay obligations with or without call or prepayment penalties. Mortgage-backed securities are not included in the maturity categories in the following maturity summary as actual maturities may differ from contractual maturities because the underlying mortgages may be called or prepaid without penalties:
		December 31, 2013						December 31, 2012
(Dollars in thousands)		Amortized			Fair Value			Amortized			Fair Value
		Cost						Cost
Due in one year or less		$	268,847		$	269,168		$	188,594		$	189,015
Due in one to five years		358,108			358,357			419,588			419,654
Due in five to ten years		350,372			330,020			361,037			362,135
Due after ten years		616,840			561,992			501,177			503,999
Mortgage-backed		620,419			605,225			261,871			271,574
Other equity securities		50,532			51,528			52,846			49,699
Total available-for-sale securities		$	2,265,118		$	2,176,290		$	1,785,113		$	1,796,076
At December 31, 2013 and December 31, 2012, securities having a carrying value of $1.2 billion and $1.1 billion, respectively, which include securities traded but not yet settled, were pledged as collateral for public deposits, trust deposits, FHLB advances, securities sold under repurchase agreements and derivatives. At December 31, 2013, there were no securities of a single issuer, other than U.S. Government-sponsored agency securities, which exceeded 10% of shareholders’ equity.

Loans

Loans	12 Months Ended
	Dec. 31, 2013
Loans and Leases Receivable Disclosure [Abstract]	'
Loans	'
	Loans
	A summary of the loan portfolio at December 31, 2013 and 2012 is as follows:
	(Dollars in thousands)		December 31,			December 31,
			2013			2012
	Balance:
	Commercial		$	3,253,687		$	2,914,798
	Commercial real-estate		4,230,035			3,864,118
	Home equity		719,137			788,474
	Residential real-estate		434,992			367,213
	Premium finance receivables—commercial		2,167,565			1,987,856
	Premium finance receivables—life insurance		1,923,698			1,725,166
	Indirect consumer		50,680			77,333
	Consumer and other		116,808			103,985
	Total loans, net of unearned income, excluding covered loans		$	12,896,602		$	11,828,943
	Covered loans		346,431			560,087
	Total loans		$	13,243,033		$	12,389,030
	Mix:
	Commercial		25		%	24		%
	Commercial real-estate		32			31
	Home equity		5			6
	Residential real-estate		3			3
	Premium finance receivables—commercial		16			16
	Premium finance receivables—life insurance		15			14
	Indirect consumer		—			1
	Consumer and other		1			1
	Total loans, net of unearned income, excluding covered loans		97		%	96		%
	Covered loans		3			4
	Total loans		100		%	100		%
	Certain premium finance receivables are recorded net of unearned income. The unearned income portions of such premium finance receivables were $41.9 million and $41.1 million at December 31, 2013 and 2012, respectively. Certain life insurance premium finance receivables attributable to the life insurance premium finance loan acquisition in 2009 as well as loans acquired with evidence of credit quality deterioration since origination are recorded net of credit discounts. See “Acquired Loan Information at Acquisition,” below.
	Total loans, excluding loans acquired with evidence of credit quality deterioration since origination, include net deferred loan fees and costs and fair value purchase accounting adjustments totaling $(9.2) million and $13.2 million at December 31, 2013 and 2012, respectively. The net credit balance at December 31, 2013 is primarily the result of purchase accounting adjustments related to the acquisition of FNBI and Diamond during 2013.
	Certain real estate loans, including mortgage loans held-for-sale, and home equity loans with balances totaling approximately $2.9 billion and $2.5 billion at December 31, 2013 and 2012, respectively, were pledged as collateral to secure the availability of borrowings from certain federal agency banks. At December 31, 2013, approximately $2.4 billion of these pledged loans are included in a blanket pledge of qualifying loans to the FHLB. The remaining $461.2 million of pledged loans was used to secure potential borrowings at the Federal Reserve Bank discount window. At December 31, 2013 and 2012, the banks borrowed $417.8 million and $414.1 million, respectively, from the FHLB in connection with these collateral arrangements. See Note 13 – Federal Home Loan Bank Advances for a summary of these borrowings.
	The Company’s loan portfolio is generally comprised of loans to consumers and small to medium-sized businesses located within the geographic market areas that the banks serve. The premium finance receivables portfolios are made to customers throughout the United States and Canada and the majority of the indirect consumer loans were generated through a network of local automobile dealers. The Company strives to maintain a loan portfolio that is diverse in terms of loan type, industry, borrower and geographic concentrations. Such diversification reduces the exposure to economic downturns that may occur in different segments of the economy or in different industries.
	It is the policy of the Company to review each prospective credit in order to determine the appropriateness and, when required, the adequacy of security or collateral necessary to obtain when making a loan. The type of collateral, when required, will vary from liquid assets to real estate. The Company seeks to assure access to collateral, in the event of default, through adherence to state lending laws and the Company’s credit monitoring procedures.
	Acquired Loan Information at Acquisition — Loans with evidence of credit quality deterioration since origination
	As part of our previous acquisitions, we acquired loans for which there was evidence of credit quality deterioration since origination and we determined that it was probable that the Company would be unable to collect all contractually required principal and interest payments. The following table presents the unpaid principal balance and carrying value for these acquired loans:
			31-Dec-13						31-Dec-12
	(Dollars in thousands)		Unpaid			Carrying			Unpaid			Carrying
			Principal			Value			Principal			Value
			Balance						Balance
	Bank acquisitions		$	453,944		$	338,517		$	674,868		$	503,837
	Life insurance premium finance loans acquisition		437,155			423,906			536,503			514,459
	The following table provides estimated details on loans acquired in 2013 as of the date of acquisition:
	(Dollars in thousands)		FNBI			Diamond
	Contractually required payments including interest		$	32,022		$	47,853
	Less: Nonaccretable difference		8,890			12,898
	Cash flows expected to be collected (1)		23,132			34,955
	Less: Accretable yield		2,055			3,451
	Fair value of loans acquired with evidence of credit quality deterioration since origination		$	21,077		$	31,504
	-1	Represents undiscounted expected principal and interest cash flows at acquisition.
	See Note 5 – Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans for further discussion regarding the allowance for loan losses associated with loans acquired with evidence of credit quality deterioration since origination at December 31, 2013.
	Accretable Yield Activity — Loans with evidence of credit quality deterioration since origination
	Changes in expected cash flows may vary from period to period as the Company periodically updates its cash flow model assumptions for loans acquired with evidence of credit quality deterioration since origination. The factors that most significantly affect the estimates of gross cash flows expected to be collected, and accordingly the accretable yield, include changes in the benchmark interest rate indices for variable-rate products and changes in prepayment assumptions and loss estimates. The following table provides activity for the accretable yield of loans acquired with evidence of credit quality deterioration since origination.
			Years Ended December 31,
			2013						2012
	(Dollars in thousands)		Bank			Life Insurance			Bank			Life Insurance
			Acquisitions			Premium			Acquisitions			Premium
						Finance Loans						Finance Loans
	Accretable yield, beginning balance		$	143,224		$	13,055		$	173,120		$	18,861
	Acquisitions		5,428			—			8,217			—
	Accretable yield amortized to interest income		(36,898		)	(8,795		)	(52,101		)	(11,441		)
	Accretable yield amortized to indemnification asset (1)		(36,202		)	—			(66,798		)	—
	Reclassification from non-accretable difference (2)		50,873			2,840			64,603			4,096
	(Decreases) increases in interest cash flows due to payments and changes in interest rates		(18,770		)	1,154			16,183			1,539
Accretable yield, ending balance (3)		$	107,655		$	8,254		$	143,224		$	13,055
-1	Represents the portion of the current period accreted yield, resulting from lower expected losses, applied to reduce the loss share indemnfication asset.
-2	Reclassification is the result of subsequent increases in expected principal cash flows.
-3	As of December 31, 2013, the Company estimates that the remaining accretable yield balance to be amortized to the indemnification asset for the bank acquisitions is $33.7 million. The remainder of the accretable yield related to bank acquisitions is expected to be amortized to interest income.
Accretion to interest income from loans acquired in bank acquisitions totaled $36.9 million and $52.1 million in 2013 and 2012, respectively.  These amounts include accretion from both covered and non-covered loans, and are included together within interest and fees on loans in the Consolidated Statements of Income.

Allowance_for_Loan_Losses_Allo

Allowance for Loan Losses Allowance for Losses on Lending-Related Commitments and Impaired Loans	12 Months Ended
	Dec. 31, 2013
Loans and Leases Receivable, Allowance [Abstract]	'
Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments nd Impaired Loans	'
	Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans
	The tables below show the aging of the Company’s loan portfolio at December 31, 2013 and 2012:
	As of December 31, 2013		Nonaccrual				90+ days				60-89				30-59			Current			Total Loans
	(Dollars in thousands)						and still				days past				days past
							accruing				due				due
	Loan Balances:
	Commercial
	Commercial and industrial		$	10,143			$	—			$	4,938			$	7,404		$	1,813,721		$	1,836,206
	Franchise		—				—				400				—			219,983			220,383
	Mortgage warehouse lines of credit		—				—				—				—			67,470			67,470
	Community Advantage — homeowners association		—				—				—				—			90,894			90,894
	Aircraft		—				—				—				—			10,241			10,241
	Asset-based lending		637				—				388				1,878			732,190			735,093
	Tax exempt		—				—				—				—			161,239			161,239
	Leases		—				—				—				788			109,043			109,831
	Other		—				—				—				—			11,147			11,147
	Purchased non-covered		—				274				156				1,685			9,068			11,183
	commercial (1)
	Total commercial		10,780				274				5,882				11,755			3,224,996			3,253,687
	Commercial real-estate:
	Residential construction		149				—				—				—			38,351			38,500
	Commercial construction		6,969				—				—				505			129,232			136,706
	Land		2,814				—				4,224				619			99,128			106,785
	Office		10,087				—				2,265				3,862			626,027			642,241
	Industrial		5,654				—				585				914			626,785			633,938
	Retail		10,862				—				837				2,435			642,125			656,259
	Multi-family		2,035				—				—				348			564,154			566,537
	Mixed use and other		8,088				230				3,943				15,949			1,344,244			1,372,454
	Purchased non-covered commercial real-estate (1)		—				18,582				3,540				5,238			49,255			76,615
	Total commercial real-estate		46,658				18,812				15,394				29,870			4,119,301			4,230,035
	Home equity		10,071				—				1,344				3,060			704,662			719,137
	Residential real estate		14,974				—				1,689				5,032			410,430			432,125
	Purchased non-covered residential real estate (1)		—				1,988				—				—			879			2,867
	Premium finance receivables
	Commercial insurance loans		10,537				8,842				6,912				24,094			2,117,180			2,167,565
	Life insurance loans		—				—				2,524				1,808			1,495,460			1,499,792
	Purchased life insurance loans (1)		—				—				—				—			423,906			423,906
	Indirect consumer		55				105				29				353			50,138			50,680
	Consumer and other		1,082				—				47				657			113,818			115,604
	Purchased non-covered consumer and other (1)		—				181				—				—			1,023			1,204
	Total loans, net of unearned income, excluding covered loans		$	94,157			$	30,202			$	33,821			$	76,629		$	12,661,793		$	12,896,602
	Covered loans		9,425				56,282				5,877				7,937			266,910			346,431
	Total loans, net of unearned income		$	103,582			$	86,484			$	39,698			$	84,566		$	12,928,703		$	13,243,033
	-1	Purchased loans represent loans acquired with evidence of credit quality deterioration since origination, in accordance with ASC 310-30. Loan agings are based upon contractually required payments. See Note 4 - Loans for further discussion of these purchased loans.
	As of December 31, 2012		Nonaccrual				90+ days				60-89				30-59			Current			Total Loans
	(Dollars in thousands)						and still				days past				days past
							accruing				due				due
	Loan Balances:
	Commercial
	Commercial and industrial		$	19,409			$	—			$	5,520			$	15,410		$	1,587,864		$	1,628,203
	Franchise		1,792				—				—				—			194,603			196,395
	Mortgage warehouse lines of credit		—				—				—				—			215,076			215,076
	Community Advantage — homeowners association		—				—				—				—			81,496			81,496
	Aircraft		—				—				148				—			17,216			17,364
	Asset-based lending		536				—				1,126				6,622			564,154			572,438
	Tax exempt		—				—				—				—			91,824			91,824
	Leases		—				—				—				896			89,547			90,443
	Other		—				—				—				—			16,549			16,549
	Purchased non-covered		—				496				432				7			4,075			5,010
	commercial (1)
	Total commercial		21,737				496				7,226				22,935			2,862,404			2,914,798
	Commercial real-estate
	Residential construction		3,110				—				4				41			37,246			40,401
Commercial construction		2,159				—				885				386			167,525			170,955
Land		11,299				—				632				9,014			113,252			134,197
Office		4,196				—				1,889				3,280			560,346			569,711
Industrial		2,089				—				6,042				4,512			565,294			577,937
Retail		7,792				—				1,372				998			558,734			568,896
Multi-family		2,586				—				3,949				1,040			389,116			396,691
Mixed use and other		16,742				—				6,660				13,349			1,312,503			1,349,254
Purchased non-covered commercial real-estate (1)		—				749				2,663				2,508			50,156			56,076
Total commercial real-estate		49,973				749				24,096				35,128			3,754,172			3,864,118
Home equity		13,423				100				1,592				5,043			768,316			788,474
Residential real estate		11,728				—				2,763				8,250			343,616			366,357
Purchased non-covered residential real estate (1)		—				—				200				—			656			856
Premium finance receivables
Commercial insurance loans		9,302				10,008				6,729				19,597			1,942,220			1,987,856
Life insurance loans		25				—				—				5,531			1,205,151			1,210,707
Purchased life insurance loans (1)		—				—				—				—			514,459			514,459
Indirect consumer		55				189				51				442			76,596			77,333
Consumer and other		1,511				32				167				433			99,010			101,153
Purchased non-covered consumer and other (1)		—				66				32				101			2,633			2,832
Total loans, net of unearned income, excluding covered loans		$	107,754			$	11,640			$	42,856			$	97,460		$	11,569,233		$	11,828,943
Covered loans		1,988				122,350				16,108				7,999			411,642			560,087
Total loans, net of unearned income		$	109,742			$	133,990			$	58,964			$	105,459		$	11,980,875		$	12,389,030
-1	Purchased loans represent loans acquired with evidence of credit quality deterioration since origination, in accordance with ASC 310-30. Loan agings are based upon contractually required payments. See Note 4 - Loans for further discussion of these purchased loans.
Our ability to manage credit risk depends in large part on our ability to properly identify and manage problem loans. To do so, we operate a credit risk rating system under which our credit management personnel assign a credit risk rating (1 to 10 rating) to each loan at the time of origination and review loans on a regular basis.
Each loan officer is responsible for monitoring his or her loan portfolio, recommending a credit risk rating for each loan in his or her portfolio and ensuring the credit risk ratings are appropriate. These credit risk ratings are then ratified by the bank’s chief credit officer and/or concurrence credit officer. Credit risk ratings are determined by evaluating a number of factors including: a borrower’s financial strength, cash flow coverage, collateral protection and guarantees.
The Company’s Problem Loan Reporting system automatically includes all loans with credit risk ratings of 6 through 9. This system is designed to provide an on-going detailed tracking mechanism for each problem loan. Once management determines that a loan has deteriorated to a point where it has a credit risk rating of 6 or worse, the Company’s Managed Asset Division performs an overall credit and collateral review. As part of this review, all underlying collateral is identified and the valuation methodology is analyzed and tracked. As a result of this initial review by the Company’s Managed Asset Division, the credit risk rating is reviewed and a portion of the outstanding loan balance may be deemed uncollectible or an impairment reserve may be established. The Company’s impairment analysis utilizes an independent re-appraisal of the collateral (unless such a third-party evaluation is not possible due to the unique nature of the collateral, such as a closely-held business or thinly traded securities). In the case of commercial real estate collateral, an independent third party appraisal is ordered by the Company’s Real Estate Services Group to determine if there has been any change in the underlying collateral value. These independent appraisals are reviewed by the Real Estate Services Group and sometimes by independent third party valuation experts and may be adjusted depending upon market conditions.
Through the credit risk rating process, loans are reviewed to determine if they are performing in accordance with the original contractual terms. If the borrower has failed to comply with the original contractual terms, further action may be required by the Company, including a downgrade in the credit risk rating, movement to non-accrual status, a charge-off or the establishment of a specific impairment reserve. If we determine that a loan amount or portion thereof is uncollectible the loan’s credit risk rating is immediately downgraded to an 8 or 9 and the uncollectible amount is charged-off. Any loan that has a partial charge-off continues to be assigned a credit risk rating of an 8 or 9 for the duration of time that a balance remains outstanding. The Company undertakes a thorough and ongoing analysis to determine if additional impairment and/or charge-offs are appropriate and to begin a workout plan for the credit to minimize actual losses.
If, based on current information and events, it is probable that the Company will be unable to collect all amounts due to it according to the contractual terms of the loan agreement, a specific impairment reserve is established. In determining the appropriate charge-off for collateral-dependent loans, the Company considers the results of appraisals for the associated collateral.
Non-performing loans include all non-accrual loans (8 and 9 risk ratings) as well as loans 90 days past due and still accruing interest, excluding loans acquired with evidence of credit quality deterioration since origination. The remainder of the portfolio is considered performing under the contractual terms of the loan agreement. The following table presents the recorded investment based on performance of loans by class, excluding covered loans, per the most recent analysis at December 31, 2013 and 2012:
		Performing								Non-performing							Total
		December 31,				December 31,				December 31,				December 31,			December 31,			December 31,
(Dollars in thousands)		2013				2012				2013				2012			2013			2012
Loan Balances:
Commercial
Commercial and industrial		$	1,826,063			$	1,608,794			$	10,143			$	19,409		$	1,836,206		$	1,628,203
Franchise		220,383				194,603				—				1,792			220,383			196,395
Mortgage warehouse lines of credit		67,470				215,076				—				—			67,470			215,076
Community Advantage—homeowners association		90,894				81,496				—				—			90,894			81,496
Aircraft		10,241				17,364				—				—			10,241			17,364
Asset-based lending		734,456				571,902				637				536			735,093			572,438
Tax exempt		161,239				91,824				—				—			161,239			91,824
Leases		109,831				90,443				—				—			109,831			90,443
Other		11,147				16,549				—				—			11,147			16,549
Purchased non-covered commercial (1)		11,183				5,010				—				—			11,183			5,010
Total commercial		3,242,907				2,893,061				10,780				21,737			3,253,687			2,914,798
Commercial real-estate
Residential construction		38,351				37,291				149				3,110			38,500			40,401
Commercial construction		129,737				168,796				6,969				2,159			136,706			170,955
Land		103,971				122,898				2,814				11,299			106,785			134,197
Office		632,154				565,515				10,087				4,196			642,241			569,711
Industrial		628,284				575,848				5,654				2,089			633,938			577,937
Retail		645,397				561,104				10,862				7,792			656,259			568,896
Multi-family		564,502				394,105				2,035				2,586			566,537			396,691
Mixed use and other		1,364,136				1,332,512				8,318				16,742			1,372,454			1,349,254
Purchased non-covered commercial real-estate (1)		76,615				56,076				—				—			76,615			56,076
Total commercial real-estate		4,183,147				3,814,145				46,888				49,973			4,230,035			3,864,118
Home equity		709,066				774,951				10,071				13,523			719,137			788,474
Residential real estate		417,151				354,629				14,974				11,728			432,125			366,357
Purchased non-covered residential real estate (1)		2,867				856				—				—			2,867			856
Premium finance receivables
Commercial insurance loans		2,148,186				1,968,546				19,379				19,310			2,167,565			1,987,856
Life insurance loans		1,499,792				1,210,682				—				25			1,499,792			1,210,707
Purchased life insurance loans (1)		423,906				514,459				—				—			423,906			514,459
Indirect consumer		50,520				77,089				160				244			50,680			77,333
Consumer and other		114,522				99,610				1,082				1,543			115,604			101,153
Purchased non-covered consumer and other (1)		1,204				2,832				—				—			1,204			2,832
Total loans, net of unearned income, excluding covered loans		$	12,793,268			$	11,710,860			$	103,334			$	118,083		$	12,896,602		$	11,828,943
-1	Purchased loans represent loans acquired with evidence of credit quality deterioration since origination, in accordance with ASC 310-30. See Note 4 - Loans for further discussion of these purchased loans.
A summary of the activity in the allowance for credit losses by loan portfolio (excluding covered loans) for the years ended December 31, 2013 and 2012 is as follows:
Year Ended		Commercial				Commercial				Home				Residential			Premium			Indirect			Consumer			Total,
December 31, 2013						Real-estate				Equity				Real-estate			Finance			Consumer			and Other			Excluding
(Dollars in thousands)																	Receivable									Covered
																										Loans
Allowance for credit losses
Allowance for loan losses at beginning of period		$	28,794			$	52,135			$	12,734			$	5,560		$	6,096		$	267		$	1,765		$	107,351
Other adjustments		(51		)		(783		)		3				(88		)	(19		)	—			—			(938		)
Reclassification to/from allowance for unfunded lending-related commitments		—				640				—				—			—			—			—			640
Charge-offs		(14,123		)		(32,745		)		(6,361		)		(2,958		)	(5,080		)	(130		)	(980		)	(62,377		)
Recoveries		1,655				2,526				432				289			1,121			53			186			6,262
Provision for credit losses		6,817				26,885				5,803				2,305			3,465			(8		)	717			45,984
Allowance for loan losses at period end		$	23,092			$	48,658			$	12,611			$	5,108		$	5,583		$	182		$	1,688		$	96,922
Allowance for unfunded lending-related commitments at period end		$	—			$	719			$	—			$	—		$	—		$	—		$	—		$	719
Allowance for credit losses at period end		$	23,092			$	49,377			$	12,611			$	5,108		$	5,583		$	182		$	1,688		$	97,641
Individually evaluated for impairment		1,392				4,653				1,593				655			—			—			109			8,402
Collectively evaluated for impairment		21,637				44,724				11,018				4,390			5,583			182			1,578			89,112
Loans acquired with deteriorated credit quality		63				—				—				63			—			—			1			127
Loans at period end
Individually evaluated for impairment		$	17,628			$	117,149			$	10,297			$	17,901		$	—		$	55		$	1,534		$	164,564
Collectively evaluated for impairment		3,224,876				4,036,271				708,840				414,224			3,667,357			50,625			114,070			12,216,263
Loans acquired with deteriorated credit quality		11,183				76,615				—				2,867			423,906			—			1,204			515,775
Year Ended		Commercial				Commercial				Home				Residential			Premium			Indirect			Consumer			Total,
December 31, 2012						Real-estate				Equity				Real-estate			Finance			Consumer			and Other			Excluding
(Dollars in thousands)																	Receivable									Covered
																										Loans
Allowance for credit losses
Allowance for loan losses at beginning of period		$	31,237			$	56,405			$	7,712			$	5,028		$	7,214		$	645		$	2,140		$	110,381
Other adjustments		(151		)		(1,054		)		(4		)		(124		)	—			—			—			(1,333		)
Reclassification to/from allowance for unfunded lending-related commitments		45				648				—				—			—			—			—			693
Charge-offs		(22,405		)		(43,539		)		(9,361		)		(4,060		)	(3,780		)	(221		)	(1,024		)	(84,390		)
Recoveries		1,220				6,635				428				22			940			103			240			9,588
Provision for credit losses		18,848				33,040				13,959				4,694			1,722			(260		)	409			72,412
Allowance for loan losses at period end		$	28,794			$	52,135			$	12,734			$	5,560		$	6,096		$	267		$	1,765		$	107,351
Allowance for unfunded lending-related commitments at period end		$	—			$	14,647			$	—			$	—		$	—		$	—		$	—		$	14,647
Allowance for credit losses at period end		$	28,794			$	66,782			$	12,734			$	5,560		$	6,096		$	267		$	1,765		$	121,998
Individually evaluated for impairment		$	3,296			$	20,481			$	2,569			$	1,169		$	—		$	—		$	142		$	27,657
Collectively evaluated for impairment		$	25,471			$	46,233			$	10,165			$	4,388		$	6,096		$	267		$	1,623		$	94,243
Loans acquired with deteriorated credit quality		$	27			$	68			$	—			$	3		$	—		$	—		$	—		$	98
Loans at period end
Individually evaluated for impairment		$	33,608			$	139,878			$	14,590			$	14,810		$	—		$	53		$	1,606		$	204,545
Collectively evaluated for impairment		2,876,180				3,668,164				773,884				351,547			3,198,563			77,280			99,547			11,045,165
Loans acquired with deteriorated credit quality		5,010				56,076				—				856			514,459			—			2,832			579,233
A summary of activity in the allowance for covered loan losses for the years ended December 31, 2013 and 2012 is as follows:
		Years Ended
		December 31,				December 31,
(Dollars in thousands)		2013				2012
Balance at beginning of period		$	13,454			$	12,977
Provision for covered loan losses before benefit attributable to FDIC loss share agreements		246				20,282
Benefit attributable to FDIC loss share agreements		(197		)		(16,258		)
Net provision for covered loan losses		49				4,024
Increase in FDIC indemnification asset		197				16,258
Loans charged-off		(15,085		)		(19,921		)
Recoveries of loans charged-off		11,477				116
Net charge-offs		(3,608		)		(19,805		)
Balance at end of period		$	10,092			$	13,454
In conjunction with FDIC-assisted transactions, the Company entered into loss share agreements with the FDIC. Additional expected losses, to the extent such expected losses result in the recognition of an allowance for loan losses, will increase the FDIC indemnification asset. The allowance for loan losses for loans acquired in FDIC-assisted transactions is determined without giving consideration to the amounts recoverable through loss share agreements (since the loss share agreements are separately accounted for and thus presented “gross” on the balance sheet). On the Consolidated Statements of Income, the provision for credit losses is reported net of changes in the amount recoverable under the loss share agreements. Reductions to expected losses, to the extent such reductions to expected losses are the result of an improvement to the actual or expected cash flows from the covered assets, will reduce the FDIC indemnification asset. Additions to expected losses will require an increase to the allowance for loan losses, and a corresponding increase to the FDIC indemnification asset. See "FDIC-Assisted Transactions" within Note 8 - Business Combinations for more detail.
Impaired Loans
A summary of impaired loans, including TDRs, at December 31, 2013 and 2012 is as follows:
(Dollars in thousands)		2013				2012
Impaired loans (included in non-performing and restructured loans):
Impaired loans with an allowance for loan loss required (1)		$	92,184			$	89,983
Impaired loans with no allowance for loan loss required		70,045				114,562
Total impaired loans (2)		$	162,229			$	204,545
Allowance for loan losses related to impaired loans		$	8,265			$	13,575
Troubled debt restructurings		$	107,103			$	126,473
Reduction of interest income from non-accrual loans		$	3,971			$	3,866
Interest income recognized on impaired loans		$	8,920			$	10,819
-1	These impaired loans require an allowance for loan losses because the estimated fair value of the loans or related collateral is less than the recorded investment in the loans.
-2	Impaired loans are considered by the Company to be non-accrual loans, TDRs or loans with principal and/or interest at risk, even if the loan is current with all payments of principal and interest.
The following tables present impaired loans evaluated for impairment by loan class as of December 31, 2013 and 2012:
		As of												For the Year Ended
December 31, 2013		Recorded				Unpaid				Related				Average			Interest Income
(Dollars in thousands)		Investment				Principal				Allowance				Recorded			Recognized
						Balance								Investment
Impaired loans with a related ASC 310 allowance recorded
Commercial
Commercial and industrial		$	6,297			$	7,001			$	1,078			$	6,611		$	354
Franchise		—				—				—				—			—
Mortgage warehouse lines of credit		—				—				—				—			—
Community Advantage—homeowners association		—				—				—				—			—
Aircraft		—				—				—				—			—
Asset-based lending		282				294				282				295			14
Tax exempt		—				—				—				—			—
Leases		—				—				—				—			—
Other		—				—				—				—			—
Commercial real-estate
Residential construction		—				—				—				—			—
Commercial construction		3,099				3,099				18				3,098			115
Land		10,518				11,871				259				10,323			411
Office		7,792				8,444				1,253				8,148			333
Industrial		3,385				3,506				193				3,638			179
Retail		17,511				17,638				1,253				17,678			724
Multi-family		3,237				3,730				235				2,248			139
Mixed use and other		28,935				29,051				1,366				26,792			1,194
Home equity		3,985				5,238				1,593				4,855			236
Residential real estate		6,876				7,023				626				6,335			273
Premium finance receivables
Commercial insurance		—				—				—				—			—
Life insurance		—				—				—				—			—
Purchased life insurance		—				—				—				—			—
Indirect consumer		—				—				—				—			—
Consumer and other		267				269				109				273			11
Impaired loans with no related ASC 310 allowance recorded
Commercial
Commercial and industrial		$	9,890			$	16,333			$	—			$	13,928		$	1,043
Franchise		—				—				—				—			—
Mortgage warehouse lines of credit		—				—				—				—			—
Community Advantage—homeowners association		—				—				—				—			—
Aircraft		—				—				—				—			—
Asset-based lending		354				2,311				—				2,162			121
Tax exempt		—				—				—				—			—
Leases		—				—				—				—			—
Other		—				—				—				—			—
Commercial real-estate
Residential construction		1,463				1,530				—				1,609			64
Commercial construction		7,710				13,227				—				9,680			722
Land		5,035				8,813				—				5,384			418
Office		10,379				11,717				—				10,925			610
Industrial		5,087				5,267				—				5,160			328
Retail		7,047				8,610				—				8,462			400
Multi-family		608				1,030				—				903			47
Mixed use and other		4,077				6,213				—				5,046			352
Home equity		6,312				7,790				—				6,307			324
Residential real estate		10,761				13,585				—				9,443			393
Premium finance receivables
Commercial insurance		—				—				—				—			—
Life insurance		—				—				—				—			—
Purchased life insurance		—				—				—				—			—
Indirect consumer		55				61				—				48			6
Consumer and other		1,267				1,804				—				1,307			109
Total loans, net of unearned income, excluding covered loans		$	162,229			$	195,455			$	8,265			$	170,658		$	8,920
		As of												For the Year Ended
December 31, 2012		Recorded				Unpaid				Related				Average			Interest Income
(Dollars in thousands)		Investment				Principal				Allowance				Recorded			Recognized
						Balance								Investment
Impaired loans with a related ASC 310 allowance recorded
Commercial
Commercial and industrial		$	11,010			$	12,562			$	1,982			$	13,312		$	881
Franchise		1,792				1,792				1,259				1,792			122
Mortgage warehouse lines of credit		—				—				—				—			—
Community Advantage—homeowners association		—				—				—				—			—
Aircraft		—				—				—				—			—
Asset-based lending		511				511				55				484			26
Tax exempt		—				—				—				—			—
Leases		—				—				—				—			—
Other		—				—				—				—			—
Commercial real-estate
Residential construction		2,007				2,007				389				2,007			98
Commercial construction		1,865				1,865				70				1,865			78
Land		12,184				12,860				1,414				12,673			483
Office		5,829				5,887				622				5,936			246
Industrial		1,150				1,200				224				1,208			75
Retail		13,240				13,314				343				13,230			584
Multi-family		3,954				3,954				348				3,972			157
Mixed use and other		22,249				23,166				2,989				23,185			1,165
Home equity		7,270				7,313				2,569				7,282			271
Residential real estate		6,420				6,931				1,169				6,424			226
Premium finance receivables
Commercial insurance		—				—				—				—			—
Life insurance		—				—				—				—			—
Purchased life insurance		—				—				—				—			—
Indirect consumer		—				—				—				—			—
Consumer and other		502				502				142				502			26
Impaired loans with no related ASC 310 allowance recorded
Commercial
Commercial and industrial		$	20,270			$	27,574			$	—			$	23,877		$	1,259
Franchise		—				—				—				—			—
Mortgage warehouse lines of credit		—				—				—				—			—
Community Advantage—homeowners association		—				—				—				—			—
Aircraft		—				—				—				—			—
Asset-based lending		25				1,362				—				252			76
Tax exempt		—				—				—				—			—
Leases		—				—				—				—			—
Other		—				—				—				—			—
Commercial real-estate
Residential construction		4,085				4,440				—				4,507			143
Commercial construction		12,263				13,395				—				13,635			540
Land		12,163				17,141				—				14,646			906
Office		8,939				9,521				—				9,432			437
Industrial		3,598				3,776				—				3,741			181
Retail		18,073				18,997				—				19,067			892
Multi-family		2,817				4,494				—				4,120			222
Mixed use and other		15,462				17,210				—				16,122			912
Home equity		7,320				8,758				—				8,164			376
Residential real estate		8,390				9,189				—				9,069			337
Premium finance receivables
Commercial insurance		—				—				—				—			—
Life insurance		—				—				—				—			—
Purchased life insurance		—				—				—				—			—
Indirect consumer		53				61				—				65			6
Consumer and other		1,104				1,558				—				1,507			94
Total loans, net of unearned income, excluding covered loans		$	204,545			$	231,340			$	13,575			$	222,076		$	10,819
Average recorded investment in impaired loans for the years ended December 31, 2013, 2012, and 2011 were $170.7 million, $222.1 million, and $247.1 million, respectively. Interest income recognized on impaired loans was $8.9 million, $10.8 million, and $12.5 million for the years ended December 31, 2013, 2012, and 2011, respectively.
TDRs
At December 31, 2013, the Company had $107.1 million in loans modified in TDRs. The $107.1 million in TDRs represents 149 credits in which economic concessions were granted to certain borrowers to better align the terms of their loans with their current ability to pay.
The Company’s approach to restructuring loans, excluding those acquired with evidence of credit quality deterioration since origination, is built on its credit risk rating system which requires credit management personnel to assign a credit risk rating to each loan. In each case, the loan officer is responsible for recommending a credit risk rating for each loan and ensuring the credit risk ratings are appropriate. These credit risk ratings are then reviewed and approved by the bank’s chief credit officer and/or concurrence credit officer. Credit risk ratings are determined by evaluating a number of factors including a borrower’s financial strength, cash flow coverage, collateral protection and guarantees. The Company’s credit risk rating scale is one through ten with higher scores indicating higher risk. In the case of loans rated six or worse following modification, the Company’s Managed Assets Division evaluates the loan and the credit risk rating and determines that the loan has been restructured to be reasonably assured of repayment and of performance according to the modified terms and is supported by a current, well-documented credit assessment of the borrower’s financial condition and prospects for repayment under the revised terms.
A modification of a loan, excluding those acquired with evidence of credit quality deterioration since origination, with an existing credit risk rating of six or worse or a modification of any other credit, which will result in a restructured credit risk rating of six or worse must be reviewed for possible TDR classification. In that event, our Managed Assets Division conducts an overall credit and collateral review. A modification of these loans is considered to be a TDR if both (1) the borrower is experiencing financial difficulty and (2) for economic or legal reasons, the bank grants a concession to a borrower that it would not otherwise consider. The modification of a loan, excluding those acquired with evidence of credit quality deterioration since origination, where the credit risk rating is five or better both before and after such modification is not considered to be a TDR. Based on the Company’s credit risk rating system, it considers that borrowers whose credit risk rating is five or better are not experiencing financial difficulties and therefore, are not considered TDRs.
All credits determined to be a TDR will continue to be classified as a TDR in all subsequent periods, unless the borrower has been in compliance with the loan’s modified terms for a period of six months (including over a calendar year-end) and the modified interest rate represented a market rate at the time of a restructuring. The Managed Assets Division, in consultation with the respective loan officer, determines whether the modified interest rate represented a current market rate at the time of restructuring. Using knowledge of current market conditions and rates, competitive pricing on recent loan originations, and an assessment of various characteristics of the modified loan (including collateral position and payment history), an appropriate market rate for a new borrower with similar risk is determined. If the modified interest rate meets or exceeds this market rate for a new borrower with similar risk, the modified interest rate represents a market rate at the time of restructuring. Additionally, before removing a loan from TDR classification, a review of the current or previously measured impairment on the loan and any concerns related to future performance by the borrower is conducted. If concerns exist about the future ability of the borrower to meet its obligations under the loans based on a credit review by the Managed Assets Division, the TDR classification is not removed from the loan. Loans classified as TDRs that are re-modified subsequent to the initial determination will continue to be classified as a TDRs following the re-modification, unless the requirements for removal from TDR classification discussed above are satisfied at the time of the re-modification.
TDRs are reviewed at the time of modification and on a quarterly basis to determine if a specific reserve is necessary. The carrying amount of the loan is compared to the expected payments to be received, discounted at the loan’s original rate, or for collateral dependent loans, to the fair value of the collateral less the estimated cost to sell. Any shortfall is recorded as a specific reserve. The Company, in accordance with ASC 310-10, continues to individually measure impairment of these loans after the TDR classification is removed.
Each TDR was reviewed for impairment at December 31, 2013 and approximately $4.8 million of impairment was present and appropriately reserved for through the Company’s normal reserving methodology in the Company’s allowance for loan losses. For TDRs in which impairment is calculated by the present value of future cash flows, the Company records interest income representing the decrease in impairment resulting from the passage of time during the respective period, which differs from interest income from contractually required interest on these specific loans. For the year-ended December 31, 2013 and 2012, the Company recorded $901,000 and $1.3 million, respectively, in interest income representing this decrease in impairment.
The tables below present a summary of the post-modification balance of loans restructured during the years ended December 31, 2013, 2012, and 2011, which represent TDRs:
Year ended		Total (1)(2)							Extension at							Reduction of					Modification to					Forgiveness of Debt (2)
December 31, 2013									Below Market							Interest Rate (2)					Interest-only
									Terms (2)												Payments (2)
(Dollars in thousands)		Count			Balance				Count			Balance				Count		Balance			Count		Balance			Count			Balance
Commercial
Commercial and industrial		6			$	708			5			$	573			4		$	553		2		$	185		—			$	—
Commercial real-estate
Residential construction		—			—				—			—				—		—			—		—			—			—
Commercial construction		3			6,120				3			6,120				—		—			3		6,120			—			—
Land		3			2,639				3			2,639				2		287			—		—			1			73
Office		4			4,021				4			4,021				1		556			—		—			—			—
Industrial		1			949				1			949				1		949			—		—			—			—
Retail		1			200				1			200				1		200			—		—			—			—
Multi-family		1			705				1			705				1		705			—		—			—			—
Mixed use and other		6			5,042				6			5,042				5		4,947			1		932			—			—
Residential real estate and other		10			2,296				6			1,613				7		931			2		234			1			1,000
Total loans		35			$	22,680			30			$	21,862			22		$	9,128		8		$	7,471		2			$	1,073
Year ended		Total (1)(2)							Extension at							Reduction of					Modification to					Forgiveness of Debt (2)
December 31, 2012									Below Market							Interest Rate (2)					Interest-only
									Terms (2)												Payments (2)
(Dollars in thousands)		Count			Balance				Count			Balance				Count		Balance			Count		Balance			Count			Balance
Commercial
Commercial and industrial		18			$	14,311			11			$	3,603			11		$	13,691		7		$	10,579		3			$	2,311
Commercial real-estate
Residential construction		3			2,147				3			2,147				1		496			1		496			—			—
Commercial construction		2			622				2			622				2		622			2		622			—			—
Land		17			31,836				17			31,836				14		30,561			13		26,511			—			—
Office		—			—				—			—				—		—			—		—			—			—
Industrial		1			727				1			727				1		727			—		—			—			—
Retail		8			13,518				8			13,518				6		8,865			6		12,897			—			—
Multi-family		1			380				—			—				1		380			1		380			—			—
Mixed use and other		15			7,333				9			4,769				11		6,268			8		3,974			—			—
Residential real estate and other		10			1,638				8			1,390				6		631			3		924			1			29
Total loans		75			$	72,512			59			$	58,612			53		$	62,241		41		$	56,383		4			$	2,340
Year ended		Total (1)(2)							Extension at							Reduction of					Modification to					Forgiveness of Debt (2)
December 31, 2011									Below Market							Interest Rate (2)					Interest-only
									Terms (2)												Payments (2)
(Dollars in thousands)		Count			Balance				Count			Balance				Count		Balance			Count		Balance			Count			Balance
Commercial
Commercial and industrial		24			$	6,956			11			$	2,273			14		$	1,933		13		$	3,780		2			$	135
Commercial real-estate
Residential construction		1			1,105				1			1,105				—		—			1		1,105			—			—
Commercial construction		8			12,140				7			11,673				3		9,402			1		467			—			—
Land		7			7,971				7			7,971				2		2,981			—		—			—			—
Office		9			8,870				6			4,780				6		4,036			3		4,292			—			—
Industrial		5			5,334				5			5,334				4		3,494			2		2,181			—			—
Retail		14			19,113				11			16,981				5		3,963			5		5,191			—			—
Multi-family		6			4,415				6			4,415				5		3,866			—		—			—			—
Mixed use and other		33			28,708				21			14,775				28		25,921			10		8,068			—			—
Residential real estate and other		16			5,916				7			2,326				13		5,262			4		1,390			—			—
Total loans		123			$	100,528			82			$	71,633			80		$	60,858		39		$	26,474		2			$	135
-1	TDRs may have more than one modification representing a concession. As such, TDRs during the period may be represented in more than one of the categories noted above.
-2	Balances represent the recorded investment in the loan at the time of the restructuring.
During the year ended December 31, 2013, $22.7 million, or 35 loans, were determined to be TDRs, compared to $72.5 million, or 75 loans, and $100.5 million, or 123 loans, in the years ended 2012 and 2011, respectively. Of these loans extended at below market terms, the weighted average extension had a term of approximately 18 months in 2013 compared to nine months in 2012 and 11 months in 2011. Further, the weighted average decrease in the stated interest rate for loans with a reduction of interest rate during the period was approximately 184 basis points, 157 basis points and 192 basis points during the years ended December 31, 2013, 2012, and 2011, respectively. Interest-only payment terms were approximately 11 months during the year ended 2013 compared to five months and nine months for the years ended 2012 and 2011, respectively. Additionally, approximately $1.0 million of principal balance was forgiven during 2013, compared to $800,000 and $67,000 forgiven during 2012 and 2011, respectively.
The tables below present a summary of all loans restructured in TDRs during the years ended December 31, 2013, 2012, and 2011, and such loans which were in payment default under the restructured terms during the respective periods:
		Year Ended December 31, 2013														Year Ended December 31, 2012										Year Ended December 31, 2011
		Total (1)(3)							Payments in							Total (1)(3)					Payments in					Total (1)(3)					Payments in
									Default  (2)(3)												Default  (2)(3)										Default  (2)(3)
(Dollars in thousands)		Count			Balance				Count			Balance				Count		Balance			Count		Balance			Count			Balance		Count	Balance
Commercial
Commercial and industrial		6			$	708			1			$	20			18		$	14,311		4		$	9,925		24			$	6,956	6	$	1,742
Commercial real-estate
Residential construction		—			—				—			—				3		2,147			—		—			1			1,105		—	—
Commercial construction		3			6,120				—			—				2		622			2		622			8			12,140		1	467
Land		3			2,639				1			215				17		31,836			2		3,786			7			7,971		2	1,667
Office		4			4,021				1			1,648				—		—			—		—			9			8,870		2	2,239
Industrial		1			949				—			—				1		727			—		—			5			5,334		2	3,224
Retail		1			200				—			—				8		13,518			1		3,607			14			19,113		2	2,694
Multi-family		1			705				1			705				1		380			—		—			6			4,415		—	—
Mixed use and other		6			5,042				1			95				15		7,333			4		1,445			33			28,708		6	5,283
Residential real estate and other		10			2,296				—			—				10		1,638			5		1,168			16			5,916		4	908
Total loans		35			$	22,680			5			$	2,683			75		$	72,512		18		$	20,553		123			$	100,528	25	$	18,224
-1	Total TDRs represent all loans restructured in TDRs during the year indicated.
-2	TDRs considered to be in payment default are over 30 days past-due subsequent to the restructuring.
-3	Balances represent the recorded investment in the loan at the time of the restructuring.

Loan_Securitization

Loan Securitization	12 Months Ended
	Dec. 31, 2013
Transfers and Servicing [Abstract]	'
Loan Securitization	'
	Loan Securitization
	During the third quarter of 2009, the Company entered into a revolving period securitization transaction sponsored by FIFC. In connection with the securitization, premium finance receivables – commercial were transferred to FIFC Premium Funding, LLC (the “securitization entity”). Principal collections on loans in the securitization entity were used to acquire and transfer additional loans into the securitization entity during the stated revolving period. At December 31, 2011, the stated revolving period ended and the majority of collections began accumulating to pay off the issued instruments as scheduled.
	Instruments issued by the securitization entity included $600 million Class A notes bearing an annual interest rate of one-month LIBOR plus 1.45%. At the time of issuance, the Notes were eligible collateral under the New York Fed's TALF. Class B and Class C notes (“subordinated securities”), which were recorded in the form of zero coupon bonds, were also issued and were retained by the Company.
	This securitization transaction was accounted for as a secured borrowing and the securitization entity is treated as a consolidated subsidiary of the Company under ASC 810, “Consolidation”. The securitization entity’s receivables underlying third-party investors’ interests were recorded in loans, net of unearned income, excluding covered loans, an allowance for loan losses was established and the related debt issued was reported in secured borrowings—owed to securitization investors. Additionally, the Company’s retained interests in the transaction, principally consisting of subordinated securities, cash collateral, and overcollateralization of loans, constituted intercompany positions, which were eliminated in the preparation of the Company’s Consolidated Statements of Condition.
	Upon transfer of premium finance receivables – commercial to the securitization entity, the receivables and certain cash flows derived from them became restricted for use in meeting obligations to the securitization entity’s creditors. The securitization entity had ownership of interest-bearing deposit balances that also had restrictions, the amounts of which were reported in interest-bearing deposits with other banks. With the exception of the seller’s interest in the transferred receivables, the Company’s interests in the securitization entity’s assets were generally subordinate to the interests of third-party investors.
	During 2012, the Company purchased portions of the Notes in the open market in the amount of $239.2 million, effectively reducing the outstanding Notes, on a consolidated basis, to $360.8 million. On August 15, 2012, the securitization entity paid off the $360.8 million of Notes held by third party investors as well as the $239.2 million owed to the Company. Additionally, the Company received payment of $49.6 million related to the subordinated securities held by the Company. As of December 31, 2013, the securitization entity held no assets or borrowings. As of December 31, 2012, the securitization entity held no loans or borrowings but retained approximately $36,000 in unrestricted cash.
	Mortgage Servicing Rights
	Following is a summary of the changes in the carrying value of MSRs, accounted for at fair value, for the years ending December 31, 2013, 2012 and 2011:
		December 31,			December 31,			December 31,
	(Dollars in thousands)	2013			2012			2011
	Balance at beginning of year	$	6,750		$	6,700		$	8,762
	Additions from loans sold with servicing retained	523			4,151			2,611
	Estimate of changes in fair value due to:
	Payoffs and paydowns	(941		)	(3,808		)	(2,430		)
	Changes in valuation inputs or assumptions	2,614			(293		)	(2,243		)
	Fair value at end of year	$	8,946		$	6,750		$	6,700
	Unpaid principal balance of mortgage loans serviced for others	$	961,619		$	1,005,372		$	958,749
	The Company recognizes MSR assets upon the sale of residential real estate loans when it retains the obligation to service the loans and the servicing fee is more than adequate compensation. The recognition of MSR assets and subsequent change in fair value are recognized in mortgage banking revenue. MSRs are subject to changes in value from actual and expected prepayment of the underlying loans. The Company does not specifically hedge the value of its MSRs.
	The Company uses a third party to assist in the valuation of its MSRs. Fair values are determined by using a discounted cash flow model that incorporates the objective characteristics of the portfolio as well as subjective valuation parameters that purchasers of servicing would apply to such portfolios sold into the secondary market. The subjective factors include loan prepayment speeds, interest rates, servicing costs and other economic factors.

Mortgage_Servicing_Rights

Mortgage Servicing Rights	12 Months Ended
	Dec. 31, 2013
Disclosures Pertaining to Servicing Assets and Servicing Liabilities [Abstract]	'
Mortgage Servicing Rights	'
	Loan Securitization
	During the third quarter of 2009, the Company entered into a revolving period securitization transaction sponsored by FIFC. In connection with the securitization, premium finance receivables – commercial were transferred to FIFC Premium Funding, LLC (the “securitization entity”). Principal collections on loans in the securitization entity were used to acquire and transfer additional loans into the securitization entity during the stated revolving period. At December 31, 2011, the stated revolving period ended and the majority of collections began accumulating to pay off the issued instruments as scheduled.
	Instruments issued by the securitization entity included $600 million Class A notes bearing an annual interest rate of one-month LIBOR plus 1.45%. At the time of issuance, the Notes were eligible collateral under the New York Fed's TALF. Class B and Class C notes (“subordinated securities”), which were recorded in the form of zero coupon bonds, were also issued and were retained by the Company.
	This securitization transaction was accounted for as a secured borrowing and the securitization entity is treated as a consolidated subsidiary of the Company under ASC 810, “Consolidation”. The securitization entity’s receivables underlying third-party investors’ interests were recorded in loans, net of unearned income, excluding covered loans, an allowance for loan losses was established and the related debt issued was reported in secured borrowings—owed to securitization investors. Additionally, the Company’s retained interests in the transaction, principally consisting of subordinated securities, cash collateral, and overcollateralization of loans, constituted intercompany positions, which were eliminated in the preparation of the Company’s Consolidated Statements of Condition.
	Upon transfer of premium finance receivables – commercial to the securitization entity, the receivables and certain cash flows derived from them became restricted for use in meeting obligations to the securitization entity’s creditors. The securitization entity had ownership of interest-bearing deposit balances that also had restrictions, the amounts of which were reported in interest-bearing deposits with other banks. With the exception of the seller’s interest in the transferred receivables, the Company’s interests in the securitization entity’s assets were generally subordinate to the interests of third-party investors.
	During 2012, the Company purchased portions of the Notes in the open market in the amount of $239.2 million, effectively reducing the outstanding Notes, on a consolidated basis, to $360.8 million. On August 15, 2012, the securitization entity paid off the $360.8 million of Notes held by third party investors as well as the $239.2 million owed to the Company. Additionally, the Company received payment of $49.6 million related to the subordinated securities held by the Company. As of December 31, 2013, the securitization entity held no assets or borrowings. As of December 31, 2012, the securitization entity held no loans or borrowings but retained approximately $36,000 in unrestricted cash.
	Mortgage Servicing Rights
	Following is a summary of the changes in the carrying value of MSRs, accounted for at fair value, for the years ending December 31, 2013, 2012 and 2011:
		December 31,			December 31,			December 31,
	(Dollars in thousands)	2013			2012			2011
	Balance at beginning of year	$	6,750		$	6,700		$	8,762
	Additions from loans sold with servicing retained	523			4,151			2,611
	Estimate of changes in fair value due to:
	Payoffs and paydowns	(941		)	(3,808		)	(2,430		)
	Changes in valuation inputs or assumptions	2,614			(293		)	(2,243		)
	Fair value at end of year	$	8,946		$	6,750		$	6,700
	Unpaid principal balance of mortgage loans serviced for others	$	961,619		$	1,005,372		$	958,749
	The Company recognizes MSR assets upon the sale of residential real estate loans when it retains the obligation to service the loans and the servicing fee is more than adequate compensation. The recognition of MSR assets and subsequent change in fair value are recognized in mortgage banking revenue. MSRs are subject to changes in value from actual and expected prepayment of the underlying loans. The Company does not specifically hedge the value of its MSRs.
	The Company uses a third party to assist in the valuation of its MSRs. Fair values are determined by using a discounted cash flow model that incorporates the objective characteristics of the portfolio as well as subjective valuation parameters that purchasers of servicing would apply to such portfolios sold into the secondary market. The subjective factors include loan prepayment speeds, interest rates, servicing costs and other economic factors.

Business_Combinations

Business Combinations	12 Months Ended
	Dec. 31, 2013
Business Combinations [Abstract]	'
Business Combinations	'
	Business Combinations
	Non-FDIC Assisted Bank Acquisitions
	On October 18, 2013, the Company acquired Diamond. Diamond was the parent company of Diamond Bank, which operated four banking locations in Chicago, Schaumburg, Elmhurst, and Northbrook, Illinois. As part of the transaction, Diamond Bank was merged into North Shore Bank. The Company acquired assets with a fair value of approximately $172.5 million, including approximately $91.7 million of loans, and assumed liabilities with a fair value of approximately $169.1 million, including approximately $140.2 million of deposits. Additionally, the Company recorded goodwill of $8.4 million on the acquisition.
	On May 1, 2013, the Company acquired FLB. FLB was the parent company of FNBI, which operated seven banking locations in the south and southwest suburbs of Chicago, as well as one location in northwest Indiana. As part of this transaction, FNBI was merged into Old Plank Trail Bank. The Company acquired assets with a fair value of approximately $373.4 million, including approximately $123.0 million of loans, and assumed liabilities with a fair value of approximately $334.7 million, including approximately $331.4 million of deposits. Additionally, the Company recorded goodwill of $14.0 million on the acquisition.
	On December 12, 2012, the Company acquired HPK. HPK was the parent company of Hyde Park Bank, which operated two banking locations in the Hyde Park neighborhood of Chicago, Illinois. As part of this transaction, Hyde Park Bank was merged into Beverly Bank. The Company acquired assets with a fair value of approximately $371.6 million, including approximately $118.5 million of loans, and assumed liabilities with a fair value of approximately $344.1 million, including approximately $243.8 million of deposits. Additionally, the Company recorded goodwill of $12.6 million on the acquisition.
	On April 13, 2012, the Company acquired a branch of Suburban located in Orland Park, Illinois. Through this transaction, the Company acquired approximately $52 million of deposits and $3 million of loans. The Company recorded goodwill of $1.5 million on the branch acquisition.
	On September 30, 2011, the Company acquired ESBI. ESBI was the parent company of Elgin State Bank, which operated three banking locations in Elgin, Illinois. As part of this transaction, Elgin State Bank was merged into St. Charles Bank. The Company acquired assets with a fair value of approximately $263.2 million, including $146.7 million of loans, and assumed liabilities with a fair value of approximately $248.4 million, including $241.1 million of deposits. Additionally, the Company recorded goodwill of $5.0 million on the acquisition.
	FDIC Assisted Bank Acquisitions
	In 2010 and 2011, the Company acquired the banking operations, including the acquisition of certain assets and the assumption of liabilities, of six financial institutions in FDIC-assisted transactions.
	Since January 1, 2012, the Company has acquired the banking operations, including the acquisition of certain assets and the assumption of liabilities, of three financial institutions in FDIC-assisted transactions. The following table presents details related to these three transactions:
	(Dollars in thousands)		Charter			Second			First United Bank
			National			Federal (1)
	Date of acquisition		February 10,			July 20,			September 28,
			2012			2012			2012
	Fair value of assets acquired, at the acquisition date		$	92,355		$	171,625		$	328,408
	Fair value of loans acquired, at the acquisition date		45,555			—			77,964
	Fair value of liabilities assumed, at the acquisition date		91,570			171,582			321,734
	Fair value of reimbursable losses, at the acquisition date(2)		13,164			—			67,190
	Gain on bargain purchase recognized		785			43			6,675
	-1	Subsequent to the acquisition of Second Federal, deposits and banking operations were divested to an unaffiliated financial institution. See "Divestiture of Previous FDIC-Assisted Acquisition" below for further discussion.
	-2	As no assets subject to loss sharing agreements were acquired in the acquisition of Second Federal, there was no fair value of reimbursable losses.
	Loans comprise the majority of the assets acquired in nearly all of these FDIC-assisted transactions since 2010, most of which are subject to loss sharing agreements with the FDIC whereby the FDIC has agreed to reimburse the Company for 80% of losses incurred on the purchased loans, OREO, and certain other assets. Additionally, the loss share agreements with the FDIC require the Company to reimburse the FDIC in the event that actual losses on covered assets are lower than the original loss estimates agreed upon with the FDIC with respect of such assets in the loss share agreements. The Company refers to the loans subject to these loss-sharing agreements as “covered loans” and uses the term “covered assets” to refer to covered loans, covered OREO and certain other covered assets. The agreements with the FDIC require that the Company follow certain servicing procedures or risk losing the FDIC reimbursement of covered asset losses.
	On their respective acquisition dates in 2012, the Company announced that its wholly−owned subsidiary banks, Old Plank Trail Bank, Hinsdale Bank and Barrington Bank, acquired certain assets and liabilities and the banking operations of First United Bank, Second Federal and Charter National, respectively, in FDIC−assisted transactions. The loans covered by the loss sharing agreements are classified and presented as covered loans and the estimated reimbursable losses are recorded as an FDIC indemnification asset in the Consolidated Statements of Condition. The Company recorded the acquired assets and liabilities at their estimated fair values at the acquisition date. The fair value for loans reflected expected credit losses at the acquisition date. Therefore, the Company will only recognize a provision for credit losses and charge-offs on the acquired loans for any further credit deterioration subsequent to the acquisition date. See Note 5 - Allowance for Loan Losses, Allowance for Losses on Lending−Related Commitments and Impaired Loans for further discussion of the allowance on covered loans.
	The loss share agreements with the FDIC cover realized losses on loans, foreclosed real estate and certain other assets. These loss share assets are measured separately from the loan portfolios because they are not contractually embedded in the loans and are not transferable with the loans should the Company choose to dispose of them. Fair values at the acquisition dates were estimated based on projected cash flows available for loss−share based on the credit adjustments estimated for each loan pool and the loss share percentages. The loss share assets are recorded as FDIC indemnification assets on the Consolidated Statements of Condition. Subsequent to the acquisition date, reimbursements received from the FDIC for actual incurred losses will reduce the FDIC indemnification assets. Reductions to expected losses, to the extent such reductions to expected losses are the result of an improvement to the actual or expected cash flows from the covered assets, will also reduce the FDIC indemnification assets. Although these assets are contractual receivables from the FDIC, there are no contractual interest rates. Additions to expected losses will require an increase to the allowance for loan losses and a corresponding increase to the FDIC indemnification assets. The corresponding accretion is recorded as a component of non−interest income on the Consolidated Statements of Income.
	The following table summarizes the activity in the Company’s FDIC indemnification asset during the periods indicated:
			Year Ended December 31,
	(Dollars in thousands)		2013			2012
	Balance at beginning of period		$	208,160		$	344,251
	Additions from acquisitions		—			80,354
	Additions from reimbursable expenses		13,022			21,859
	Amortization		(7,556		)	(7,209		)
	Changes in expected reimbursements from the FDIC for changes in expected credit losses		(74,511		)	(61,406		)
	Payments received from the FDIC		(53,443		)	(169,689		)
	Balance at end of period		$	85,672		$	208,160
	Divestiture of Previous FDIC-Assisted Acquisition
	On February 1, 2013, the Company completed the divestiture of the deposits and current banking operations of Second Federal to an unaffiliated financial institution. Through this transaction, the Company divested approximately $149 million of related deposits.
	Specialty Finance Acquisition
	On June 8, 2012, the Company completed its acquisition of Macquarie Premium Funding Inc., the Canadian insurance premium funding business of Macquarie Group. Through this transaction, the Company acquired approximately $213 million of gross premium finance receivables. The Company recorded goodwill of approximately $21.9 million at the time of the acquisition.
	Wealth Management Acquisitions
	On March 30, 2012, CTC acquired the trust operations of Suburban. Through this transaction, CTC acquired trust accounts having assets under administration of approximately $160 million, in addition to land trust accounts. The Company recorded goodwill of $1.8 million on this trust operations acquisition.
	On July 1, 2011, the Company acquired Great Lakes Advisors, a Chicago-based investment manager with approximately $2.4 billion in assets under management. The Company acquired assets with a fair value of approximately $26.0 million and assumed liabilities with a fair value of approximately $8.8 million. The Company recorded goodwill of $15.7 million on the acquisition.
	Mortgage Banking Acquisitions
	On October 1, 2013, the Company acquired certain assets and assumed certain liabilities of the mortgage banking business of Surety of Sherman Oaks, California. Surety had five offices located in southern California which originated approximately$1.0 billion in the twelve months prior to the acquisition date. The Company recorded goodwill of $9.5 million on the acquisition.
	On April 13, 2011, the Company acquired certain assets and assumed certain liabilities of the mortgage banking business of River City of Bloomington, Minnesota. Licensed to originate loans in five states, and with offices in Minnesota, Nebraska and North Dakota, River City originated nearly $500 million in mortgage loans in 2010.
	On February 3, 2011, the Company acquired certain assets and assumed certain liabilities of the mortgage banking business of Woodfield of Rolling Meadows, Illinois. With offices in Rolling Meadows, Illinois and Crystal Lake, Illinois, Woodfield originated approximately $180 million in mortgage loans in 2010.
	Purchased loans with evidence of credit quality deterioration since origination
	Purchased loans acquired in a business combination are recorded at estimated fair value on their purchase date. Expected future cash flows at the purchase date in excess of the fair value of loans are recorded as interest income over the life of the loans if the timing and amount of the future cash flows is reasonably estimable (“accretable yield”). The difference between contractually required payments and the cash flows expected to be collected at acquisition is referred to as the non-accretable difference and represents probable losses in the portfolio.
	In determining the acquisition date fair value of purchased impaired loans, and in subsequent accounting, the Company aggregates these purchased loans into pools of loans by common risk characteristics, such as credit risk rating and loan type. Subsequent to the purchase date, increases in cash flows over those expected at the purchase date are recognized as interest income prospectively. Subsequent decreases to the expected cash flows will result in a provision for loan losses.
	The Company purchased a portfolio of life insurance premium finance receivables in 2009. These purchased life insurance premium finance receivables are valued on an individual basis with the accretable component being recognized into interest income using the effective yield method over the estimated remaining life of the loans. The non-accretable portion is evaluated each quarter and if the loans’ credit related conditions improve, a portion is transferred to the accretable component and accreted over future periods. In the event a specific loan prepays in whole, any remaining accretable and non-accretable discount is recognized in income immediately. If credit related conditions deteriorate, an allowance related to these loans will be established as part of the provision for credit losses.
	See Note 4 — Loans, for more information on loans acquired with evidence of credit quality deterioration since origination.

Goodwill_and_Other_Intangible_

Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill and Other Intangible Assets	'
	Goodwill and Other Intangible Assets
	A summary of the Company’s goodwill assets by business segment is presented in the following table:
	(Dollars in thousands)		January 1,			Goodwill			Impairment		Goodwill Adjustments			December 31,
			2013			Acquired			Loss					2013
	Community banking		$	274,963		$	31,846		$	—	$	(1,496	)	$	305,313
	Specialty finance		38,574			—			—		(1,204		)	37,370
	Wealth management		31,864			—			—		—			31,864
	Total		$	345,401		$	31,846		$	—	$	(2,700	)	$	374,547
	The community banking segment's goodwill increased $31.8 million in 2013 as a result of the acquisitions of FNBI, Surety and Diamond, partially offset by $1.5 million in subsequent purchase adjustments related to the acquisition of Hyde Park Bank. Additionally, the specialty finance segment's goodwill decreased $1.2 million during this same period as a result of subsequent purchase adjustments and foreign currency translation adjustments related to the acquisition of Macquarie Premium Funding Inc. in 2012.
	A summary of finite-lived intangible assets as of the dates shown and the expected amortization as of December 31, 2013 is as follows:
			December 31,
	(Dollars in thousands)		2013			2012
	Community banking segment:
	Core deposit intangibles:
	Gross carrying amount		$	40,770		$	38,176
	Accumulated amortization		(29,189		)	(25,159		)
	Net carrying amount		$	11,581		$	13,017
	Specialty finance segment:
	Customer list intangibles:
	Gross carrying amount		$	1,800		$	1,800
	Accumulated amortization		(805		)	(645		)
	Net carrying amount		$	995		$	1,155
	Wealth management segment:
	Customer list and other intangibles:
	Gross carrying amount		$	7,690		$	7,390
	Accumulated amortization		(1,053		)	(615		)
	Net carrying amount		$	6,637		$	6,775
	Total other intangible assets, net		$	19,213		$	20,947
	Estimated amortization
	Estimated—2014	$	4,369
	Estimated—2015	2,791
	Estimated—2016	2,180
	Estimated—2017	1,764
	Estimated—2018	1,544
	The increase in core deposit intangibles from 2012 was primarily from the acquisitions of FNBI and Diamond, partially offset by the divestiture of the deposits and current banking locations of Second Federal in 2013. The core deposit intangibles recognized in connection with these acquisitions are being amortized over ten-year periods on an accelerated basis.
	The customer list intangibles recognized in connection with the purchase of life insurance premium finance assets in 2009 are being amortized over an 18-year period on an accelerated basis.
	The increase in intangibles within the wealth management segment was related to the Company’s acquisition of the trust operations of FNBI during 2013. The customer list intangible recognized in connection with the acquisition is being amortized over a ten-year period on a straight-line basis.
	Total amortization expense associated with finite-lived intangibles in 2013, 2012 and 2011 was $4.6 million, $4.3 million and $3.4 million, respectively.

Premises_and_Equipment_Net

Premises and Equipment, Net	12 Months Ended
	Dec. 31, 2013
Property, Plant and Equipment [Abstract]	'
Premises and Equipment, Net	'
	Premises and Equipment, Net
	A summary of premises and equipment at December 31, 2013 and 2012 is as follows:
		December 31,
	(Dollars in thousands)	2013		2012
	Land	$	116,906	$	105,427
	Buildings and leasehold improvements	440,456		415,502
	Furniture, equipment, and computer software	144,854		134,945
	Construction in progress	17,966		10,353
		720,182		666,227
	Less: Accumulated depreciation and amortization	188,235		165,022
	Total premises and equipment, net	$	531,947	$	501,205
	Depreciation and amortization expense related to premises and equipment, totaled $26.0 million in 2013, $23.1 million in 2012 and $19.1 million in 2011.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2013
Deposits [Abstract]	'
Deposits	'
	Deposits
	The following is a summary of deposits at December 31, 2013 and 2012:
	(Dollars in thousands)	2013			2012
	Balance:
	Non-interest bearing	$	2,721,771		$	2,396,264
	NOW	1,953,882			2,022,957
	Wealth management deposits	1,013,850			991,902
	Money market	3,359,999			2,761,498
	Savings	1,392,575			1,275,012
	Time certificates of deposit	4,226,712			4,980,911
	Total deposits	$	14,668,789		$	14,428,544
	Mix:
	Non-interest bearing	19		%	17		%
	NOW	13			14
	Wealth management deposits	7			7
	Money market	23			19
	Savings	9			9
	Time certificates of deposit	29			34
	Total deposits	100		%	100		%
	Wealth management deposits represent deposit balances (primarily money market accounts) at the Company’s subsidiary banks from brokerage customers of WHI, trust and asset management customers of CTC and brokerage customers from unaffiliated companies.
	The scheduled maturities of time certificates of deposit at December 31, 2013 and 2012 are as follows:
	(Dollars in thousands)	2013			2012
	Due within one year	$	2,640,757		$	3,314,646
	Due in one to two years	908,443			1,042,769
	Due in two to three years	465,788			377,180
	Due in three to four years	131,455			135,003
	Due in four to five years	74,647			105,944
	Due after five years	5,622			5,369
	Total time certificate of deposits	$	4,226,712		$	4,980,911
	The following table sets forth the scheduled maturities of time deposits in denominations of $100,000 or more at December 31, 2013 and 2012:
	(Dollars in thousands)	2013			2012
	Maturing within three months	$	584,948		$	591,901
	After three but within six months	395,118			719,425
	After six but within 12 months	647,389			982,407
	After 12 months	1,088,954			1,073,016
	Total	$	2,716,409		$	3,366,749

Notes_Payable

Notes Payable	12 Months Ended
	Dec. 31, 2013
Notes Payable [Abstract]	'
Notes Payable	'
	Notes Payable
	At December 31, 2013, the Company had notes payable of $364,000, which represents an unsecured promissory note to a Great Lakes Advisor shareholder ("Unsecured Promissory Note") assumed by the Company as a result of the respective acquisition. Under the Unsecured Promissory Note, the Company will make quarterly principal payments and pay interest at a rate of the federal funds rate plus 100 basis points until its maturity on September 30, 2014. As of December 31, 2013, the current interest rate was 1.25%. At December 31, 2012, this Unsecured Promissory Note had an outstanding balance of $1.1 million.
	The Company previously had a $101.0 million loan agreement (“Agreement”) with unaffiliated banks. The Agreement consisted of a $100.0 million revolving credit facility, maturing on October 25, 2013, and a $1.0 million term loan maturing on June 1, 2015. The Agreement was amended in 2013, effectively extending the maturity date on the revolving credit facility from October 25, 2013 to November 6, 2014. Additionally, the Company repaid and terminated its $1.0 million term loan at that time. At December 31, 2013, no amount was outstanding on the $100.0 million revolving credit facility. Borrowings under the Agreement that are considered “Base Rate Loans” will bear interest at a rate equal to the higher of (1) 350 basis points and (2) for the applicable period, the highest of (a) the federal funds rate plus 100 basis points, (b) the lender’s prime rate plus 50 basis points, and (c) the Eurodollar Rate (as defined below) that would be applicable for an interest period of one month plus 150 basis points. Borrowings under the Agreement that are considered “Eurodollar Rate Loans” will bear interest at a rate equal to the higher of (1) the British Bankers Association’s LIBOR rate for the applicable period plus 250 basis points (the “Eurodollar Rate”) and (2) 350 basis points. A commitment fee is payable quarterly equal to 0.375% of the actual daily amount by which the lenders’ commitment under the revolving note exceeded the amount outstanding under such facility.
	Borrowings under the Agreement are secured by the stock of some of the banks and contains several restrictive covenants, including the maintenance of various capital adequacy levels, asset quality and profitability ratios, and certain restrictions on dividends and other indebtedness. At December 31, 2013, the Company was in compliance with all debt covenants. The credit facility is available to be utilized, as needed, to provide capital to fund continued growth at the Company’s banks and to serve as an interim source of funds for acquisitions, common stock repurchases or other general corporate purposes.

Federal_Home_Loan_Bank_Advance

Federal Home Loan Bank Advances	12 Months Ended
	Dec. 31, 2013
Advances from Federal Home Loan Banks [Abstract]	'
Federal Home Loan Bank Advances	'
	Federal Home Loan Bank Advances
	A summary of the outstanding FHLB advances at December 31, 2013 and 2012, is as follows:
	(Dollars in thousands)	2013		2012
	1.45% advance due July 2013	—		26,000
	0.13% advance due January 2014	30,000		—
	1.94% advance due July 2014	10,000		10,000
	1.58% advance due September 2014	25,127		25,300
	1.63% advance due September 2014	25,135		25,322
	0.72% advance due February 2015	141,000		141,000
	0.73% advance due February 2015	5,000		5,000
	0.99% advance due February 2016	26,500		26,500
	1.25% advance due February 2017	25,000		25,000
	3.47% advance due November 2017	10,000		10,000
	1.49% advance due February 2018	95,000		95,000
	4.18% advance due February 2022	25,000		25,000
	Total Federal Home Loan Bank advances	$	417,762	$	414,122
	Federal Home Loan Bank advances consist of obligations of the banks and are collateralized by qualifying residential real estate and home equity loans and certain securities. FHLB advances are stated at par value of the debt adjusted for unamortized fair value adjustments recorded in connection with advances acquired through acquisitions. In order to achieve lower interest rates and to extend maturities, the Company restructured $292.5 million of FHLB advances in 2012, paying $22.4 million in prepayment fees. The Company did not restructure any FHLB advances in 2013. These prepayment fees are classified in other assets on the Consolidated Statements of Condition and are amortized as an adjustment to interest expense using the effective interest method.
	Approximately $35.0 million of the FHLB advances outstanding at December 31, 2013, have varying put dates in February 2014. At December 31, 2013, the weighted average contractual interest rate on FHLB advances was 1.31% and the weighted average effective interest rate, which reflects amortization of fair value adjustments associated with FHLB advances acquired through acquisitions, was 1.22%.
	The banks have arrangements with the FHLB whereby, based on available collateral, they could have borrowed an additional $771.1 million at December 31, 2013.

Subordinated_Notes

Subordinated Notes	12 Months Ended
	Dec. 31, 2013
Subordinated Borrowings [Abstract]	'
Subordinated Notes	'
	Subordinated Notes
	At December 31, 2013, the Company had no outstanding subordinated notes. At December 31, 2012, the Company had an obligation for one note issued in October 2005 with a remaining balance of $15.0 million and a maturity in May 2015. In November 2013, this note was paid-off prior to maturity with a remaining balance of $10.0 million at that time. During 2012, two subordinated notes issued in October 2002 and April 2003 with remaining balances of $5.0 million and $10.0 million, respectively, were paid-off prior to maturity.
	The interest rate on each subordinated note was calculated at a rate equal to LIBOR plus 130 basis points. At December 31, 2012, the weighted average contractual interest rate on the subordinated notes was 1.61%. In connection with the issuances of subordinated notes, the Company incurred costs totaling $1.0 million. These costs were included in other assets and were amortized to interest expense using a method that approximates the effective interest method. At December 31, 2013 the balances of these costs were fully amortized. At December 31, 2012, the unamortized balances of these costs were approximately $3,000. These subordinated notes qualified as Tier II capital under the regulatory capital requirements, subject to restrictions.

Other_Borrowings

Other Borrowings	12 Months Ended
	Dec. 31, 2013
Other Borrowings [Abstract]	'
Other Borrowings	'
	Other Borrowings
	The following is a summary of other borrowings at December 31, 2013 and 2012:
	(Dollars in thousands)	2013		2012
	Securities sold under repurchase agreements	$	235,347	$	238,401
	Other	19,393		36,010
	Secured borrowings — owed to securitization investors	—		—
	Total other borrowings	$	254,740	$	274,411
	Securities sold under repurchase agreements represent $55.3 million and $55.0 million of customer sweep accounts in connection with master repurchase agreements at the banks at December 31, 2013 and 2012, respectively, as well as $180.0 million and $183.4 million of short-term borrowings from banks and brokers at December 31, 2013 and 2012, respectively. The Company records securities sold under repurchase agreements at their gross value and does not offset positions on the Consolidated Statements of Condition. As of December 31, 2013, the Company had pledged securities related to its customer balances in sweep accounts and short-term borrowing from brokers of $60.0 million and $191.3 million, respectively, which exceed the outstanding borrowings resulting in no net credit exposure. Securities pledged for customer balances in sweep accounts are maintained under the Company’s control and consist of U.S. Government agency, mortgage-backed and corporate securities. These securities are included in the available-for-sale securities portfolio as reflected on the Company’s Consolidated Statements of Condition.
	Other borrowings at December 31, 2013 primarily represent a fixed-rate promissory note issued by the Company in August 2012 ("Fixed-rate Promissory Note") related to and secured by an office building owned by the Company. At December 31, 2013, the Fixed-rate Promissory Note had an outstanding balance of $19.3 million. Under the Fixed-rate Promissory Note, the Company will make monthly principal payments and pay interest at a fixed rate of 3.75% until maturity on September 1, 2017.
	Junior subordinated amortizing notes issued by the Company in connection with the issuance of the TEU's in December 2010 were paid off in 2013. At issuance, the junior subordinated notes were recorded at their initial principal balance of $44.7 million, net of issuance costs. These notes had a stated interest rate of 9.5% and required quarterly principal and interest payments of $4.3 million, with an initial payment of $4.6 million that was paid on March 15, 2011. The issuance costs were being amortized to interest expense using the effective-interest method. The final installment payment on the notes was made as scheduled on December 15, 2013. See Note 24 — Shareholders’ Equity for further discussion of the TEUs.
	During the third quarter of 2009, the Company entered into an off-balance sheet securitization transaction sponsored by FIFC. In connection with the securitization, premium finance receivables — commercial were transferred to FIFC Premium Funding, LLC, a QSPE. The QSPE issued $600 million Class A notes, which were reflected on the Company's Consolidated Statements of Condition as secured borrowings owed to securitization investors, that had an annual interest rate of one-month LIBOR plus 1.45%. At the time of issuance, the Notes were eligible collateral under TALF. During 2012, the Company purchased $239.2 million of the Notes in the open market effectively defeasing a portion of the Notes. During the third quarter of 2012, the Company completely paid the remaining portion of these Notes. See Note 6 — Loan Securitization, for more information on the QSPE.

Junior_Subordinated_Debentures

Junior Subordinated Debentures	12 Months Ended
	Dec. 31, 2013
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust [Abstract]	'
Junior Subordinated Debentures	'
	Junior Subordinated Debentures
	As of December 31, 2013, the Company owned 100% of the common securities of nine trusts, Wintrust Capital Trust III, Wintrust Statutory Trust IV, Wintrust Statutory Trust V, Wintrust Capital Trust VII, Wintrust Capital Trust VIII, Wintrust Capital Trust IX, Northview Capital Trust I, Town Bankshares Capital Trust I, and First Northwest Capital Trust I (the “Trusts”) set up to provide long- term financing. The Northview, Town and First Northwest capital trusts were acquired as part of the acquisitions of Northview Financial Corporation, Town Bankshares, Ltd., and First Northwest Bancorp, Inc., respectively. The Trusts were formed for purposes of issuing trust preferred securities to third-party investors and investing the proceeds from the issuance of the trust preferred securities and common securities solely in junior subordinated debentures issued by the Company (or assumed by the Company in connection with an acquisition), with the same maturities and interest rates as the trust preferred securities. The junior subordinated debentures are the sole assets of each of the Trusts. In each Trust, the common securities represent approximately 3% of the junior subordinated debentures and the trust preferred securities represent approximately 97% of the junior subordinated debentures.
	The Trusts are reported in the Company’s consolidated financial statements as unconsolidated subsidiaries. Accordingly, in the Consolidated Statements of Condition, the junior subordinated debentures issued by the Company to the Trusts are reported as liabilities and the common securities of the Trusts, all of which are owned by the Company, are included in available-for-sale securities.
	The following table provides a summary of the Company’s junior subordinated debentures as of December 31, 2013 and 2012. The junior subordinated debentures represent the par value of the obligations owed to the Trusts.
		Common Securities		Trust Preferred Securities		Junior				Rate Structure	Contractual rate at 12/31/2013			Maturity Date	Earliest Redemption Date
						Subordinated
						Debentures
	(Dollars in thousands)					2013		2012					Issue Date
	Wintrust Capital Trust III	$	774	$	25,000	$	25,774	$	25,774	L+3.25	3.49	%	Apr-03	Apr-33	Apr-08
	Wintrust Statutory Trust IV	619		20,000		20,619		20,619		L+2.80	3.05	%	Dec-03	Dec-33	Dec-08
	Wintrust Statutory Trust V	1,238		40,000		41,238		41,238		L+2.60	2.85	%	May-04	May-34	Jun-09
	Wintrust Capital Trust VII	1,550		50,000		51,550		51,550		L+1.95	2.19	%	Dec-04	Mar-35	Mar-10
	Wintrust Capital Trust VIII	1,238		40,000		41,238		41,238		L+1.45	1.7	%	Aug-05	Sep-35	Sep-10
	Wintrust Capital Trust IX	1,547		50,000		51,547		51,547		L+1.63	1.87	%	Sep-06	Sep-36	Sep-11
	Northview Capital Trust I	186		6,000		6,186		6,186		L+3.00	3.24	%	Aug-03	Nov-33	Aug-08
	Town Bankshares Capital Trust I	186		6,000		6,186		6,186		L+3.00	3.24	%	Aug-03	Nov-33	Aug-08
	First Northwest Capital Trust I	155		5,000		5,155		5,155		L+3.00	3.25	%	May-04	May-34	May-09
	Total					$	249,493	$	249,493		2.43	%
	The junior subordinated debentures totaled $249.5 million at December 31, 2013 and 2012.
	The interest rates on the variable rate junior subordinated debentures are based on the three-month LIBOR rate and reset on a quarterly basis. The interest rate on the Wintrust Capital Trust IX junior subordinated debentures, previously fixed at 6.84%, changed to a variable rate equal to three-month LIBOR plus 1.63% effective September 15, 2011. At December 31, 2013, the weighted average contractual interest rate on the junior subordinated debentures was 2.43%. The Company entered into interest rate swaps and caps with an aggregate notional value of $225 million to hedge the variable cash flows on certain junior subordinated debentures. Two of these interest rate caps, which were purchased in the second quarter of 2013 with an aggregate notional amount of $90 million, replaced two interest swaps that matured in September 2013. The hedge-adjusted rate on the junior subordinated debentures as of December 31, 2013, was 3.21%. Distributions on the common and preferred securities issued by the Trusts are payable quarterly at a rate per annum equal to the interest rates being earned by the Trusts on the junior subordinated debentures. Interest expense on the junior subordinated debentures is deductible for income tax purposes.
	The Company has guaranteed the payment of distributions and payments upon liquidation or redemption of the trust preferred securities, in each case to the extent of funds held by the Trusts. The Company and the Trusts believe that, taken together, the obligations of the Company under the guarantees, the junior subordinated debentures, and other related agreements provide, in the aggregate, a full, irrevocable and unconditional guarantee, on a subordinated basis, of all of the obligations of the Trusts under the trust preferred securities. Subject to certain limitations, the Company has the right to defer the payment of interest on the junior subordinated debentures at any time, or from time to time, for a period not to exceed 20 consecutive quarters. The trust preferred securities are subject to mandatory redemption, in whole or in part, upon repayment of the junior subordinated debentures at maturity or their earlier redemption. The junior subordinated debentures are redeemable in whole or in part prior to maturity at any time after the earliest redemption dates shown in the table, and earlier at the discretion of the Company if certain conditions are met, and, in any event, only after the Company has obtained Federal Reserve approval, if then required under applicable guidelines or regulations.
	The junior subordinated debentures, subject to certain limitations, qualify as Tier 1 capital of the Company for regulatory purposes. The amount of junior subordinated debentures and certain other capital elements in excess of those certain limitations could be included in Tier 2 capital, subject to restrictions. At December 31, 2013, all of the junior subordinated debentures, net of the Common Securities, were included in the Company’s Tier 1 regulatory capital.

Minimum_Lease_Commitments

Minimum Lease Commitments	12 Months Ended
	Dec. 31, 2013
Leases [Abstract]	'
Minimum Lease Commitments	'
	Minimum Lease Commitments
	The Company occupies certain facilities under operating lease agreements. Gross rental expense related to the Company’s operating leases was $9.1 million in 2013 and $7.9 million in 2012 and 2011. The Company also leases certain owned premises and receives rental income from such lease agreements. Gross rental income related to the Company’s buildings totaled $7.0 million, $4.7 million and $3.8 million, in 2013, 2012 and 2011, respectively. The approximate minimum annual gross rental payments and gross rental income under noncancelable agreements for office space with remaining terms in excess of one year as of December 31, 2013, are as follows (in thousands):
		Payments		Income
	2014	$	5,112	$	5,089
	2015	5,180		4,941
	2016	4,852		4,248
	2017	4,343		3,636
	2018	3,693		3,025
	2019 and thereafter	9,851		4,330
	Total minimum future amounts	$	33,031	$	25,269

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	Income Taxes
	Income tax expense (benefit) for the years ended December 31, 2013, 2012 and 2011 is summarized as follows:
		Years Ended December 31,
	(Dollars in thousands)	2013			2012			2011
	Current income taxes:
	Federal	$	67,449		$	74,109		$	40,312
	State	16,046			16,224			10,785
	Foreign	2,196			1,918			—
	Total current income taxes	$	85,691		$	92,251		$	51,097
	Deferred income taxes:
	Federal	1,813			(19,550		)	(555		)
	State	(114		)	(4,206		)	(84		)
	Foreign	(160		)	441			—
	Total deferred income taxes	1,539			(23,315		)	(639		)
	Total income tax expense	$	87,230		$	68,936		$	50,458
	The tax effect of fair value adjustments on securities available-for-sale and derivative instruments in cash flow hedges are recorded directly to shareholders' equity as part of other comprehensive income (loss). In addition, tax expense (benefit) of $831,000, ($1.4 million) and ($129,000) in 2013, 2012 and 2011, respectively, related to the exercise and expiration of certain stock options and vesting and issuance of restricted shares pursuant to the Stock Incentive Plans and the issuance of shares pursuant to the Directors Deferred Fee and Stock Plan, were recorded directly to shareholders’ equity.
	A reconciliation of the differences between taxes computed using the statutory Federal income tax rate of 35% and actual income tax expense is as follows:
		Years Ended December 31,
	(Dollars in thousands)	2013			2012			2011
	Income tax expense based upon the Federal statutory rate on income before income taxes	$	78,554		$	63,046		$	44,812
	Increase (decrease) in tax resulting from:
	Tax-exempt interest, net of interest expense disallowance	(1,423		)	(1,294		)	(1,139		)
	State taxes, net of federal tax benefit	10,355			7,811			6,955
	Income earned on bank owned life insurance	(1,157		)	(974		)	(854		)
	Non-deductible compensation costs	654			1,156			644
	Meals, entertainment and related expenses	993			931			802
	Foreign subsidiary, net	588			1,991			—
	Foreign tax credits	—			(2,177		)	—
	Tax credits, excluding foreign tax credits	(1,553		)	(1,906		)	(562		)
	Other, net	219			352			(200		)
	Income tax expense	$	87,230		$	68,936		$	50,458
	The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and liabilities at December 31, 2013 and 2012 are as follows:
		Years Ended December 31,
	(Dollars in thousands)	2013			2012
	Deferred tax assets:
	Allowance for credit losses	$	37,525		$	42,480
	Net unrealized losses on derivatives included in other comprehensive income	1,574			3,442
	Net unrealized losses on securities included in other comprehensive income	35,216			—
	Deferred compensation	16,089			7,453
	Stock-based compensation	10,340			11,333
	Nonaccrued interest	1,895			3,053
	Other real estate owned	6,405			9,193
	Mortgage banking recourse obligation	1,503			1,706
	Covered assets	13,616			7,527
	Pension plan liabilities	1,035			916
	Federal net operating loss carryforward	2,452			—
	AMT credit carryforward	1,346			345
	State tax losses carryforward	3,294			130
	Foreign tax credit carryforward	—			1,042
	Other	2,149			2,072
	Total gross deferred tax assets	134,439			90,692
	Deferred tax liabilities:
	Discount on purchased loans	5,718			27,458
	Premises and equipment	36,847			29,725
	Goodwill and intangible assets	1,683			338
	Deferred loan fees and costs	4,533			4,487
	FHLB stock dividends	1,431			1,610
	Capitalized servicing rights	3,547			2,670
	Net unrealized gains on securities included in other comprehensive income	—			4,336
	Fair value adjustments on loans	6,947			6,634
	Other	3,606			2,680
	Total gross deferred liabilities	64,312			79,938
	Valuation allowance	—			1,042
Net deferred tax assets	$	70,127		$	9,712
In 2013, a tax law change related to active financing was enacted and made retro-active to 2012. As a result, the deferred tax asset for foreign tax credit carryforwards and related valuation allowance which were established in 2012, were reversed and recognized through other comprehensive income. Management has determined that a valuation allowance is not required for the deferred tax assets at December 31, 2013 because it is more likely than not that these assets could be realized through carry back to taxable income in prior years, future reversals of existing taxable temporary differences and future taxable income. This conclusion is based on the Company's historical earnings, its current level of earnings and prospects for continued growth and profitability.
The Company has an AMT credit carryforward of $1.3 million which has no expiration date and a Federal NOL carryforward of $7.0 million that begins to expire in 2029 and is subject to Internal Revenue Code Section 382 annual limitation. Management believes it is more likely than not it will be able to fully utilize the Federal NOL in future tax years. In addition, the Company has an Illinois net loss deduction carryforward of $53.3 million. The Illinois net loss deduction begins to expire in 2017 and is not subject to any annual limitation. Management believes that it is more likely than not it will be able to fully utilize the Illinois net loss deduction under the current Illinois state tax laws. These credit and loss carryforwards were a result of acquisitions made in 2012 and 2013.
The Company is required to record a liability (or a reduction of an asset) for the uncertainty associated with certain tax positions. This liability, if any, reflects the fact that the Company has not recognized the benefit associated with the tax position. The Company had no unrecognized tax benefits at December 31, 2012 and it did not have increases or decreases in unrecognized tax benefits during 2013 and does not have any tax positions for which unrecognized tax benefits must be recorded at December 31, 2013. In addition, for the year ended December 31, 2013, the Company has no interest or penalties relating to income tax positions recognized in the income statement or in the balance sheet. If the Company were to record interest and penalties associated with uncertain tax positions or as a result of an audit by a tax jurisdiction, the interest and penalties would be included in income tax expense. The Company does not believe it is reasonably possible that unrecognized tax benefits will significantly change in the next 12 months.
The Company and its subsidiaries are subject to U.S. federal income tax as well as income tax in numerous state jurisdictions and in Canada. In the ordinary course of business we are routinely subject to audit by the taxing authorities of these jurisdictions. Currently, the Company's federal income tax returns are open and subject to audit for the 2010 tax return year forward, and in general, the Company's state income tax returns are open and subject to audit from the 2010 tax return year forward, subject to individual state statutes of limitation.

Stock_Compensation_Plans_and_O

Stock Compensation Plans and Other Employee Benefit Plans	12 Months Ended
	Dec. 31, 2013
Share-based Compensation [Abstract]	'
Stock Compensation Plans and Other Employee Benefit Plans	'
	Stock Compensation Plans and Other Employee Benefit Plans
	Stock Incentive Plan
	The 2007 Stock Incentive Plan (“the 2007 Plan”), which was approved by the Company’s shareholders in January 2007, permits the grant of incentive stock options, nonqualified stock options, rights and restricted stock, as well as the conversion of outstanding options of acquired companies to Wintrust options. The 2007 Plan initially provided for the issuance of up to 500,000 shares of common stock. In May 2009 and May 2011, the Company’s shareholders approved an additional 325,000 shares and 2,860,000 shares, respectively, of common stock that may be offered under the 2007 Plan. All grants made after 2006 have been made pursuant to the 2007 Plan, and as of December 31, 2013, 752,491 shares were available for future grants (assuming the maximum number of shares are issued in the performance awards outstanding). The 2007 Plan replaced the Wintrust Financial Corporation 1997 Stock Incentive Plan (“the 1997 Plan”) which had substantially similar terms. The 2007 Plan and the 1997 Plan are collectively referred to as “the Plans.” The Plans cover substantially all employees of Wintrust. The Compensation Committee of the Board of Directors administers all stock-based compensation programs and authorizes all awards granted pursuant to the Plans.
	The Company historically awarded stock-based compensation in the form of nonqualified stock options and time-vested restricted share awards (“restricted shares”). In general, the grants of options provide for the purchase shares of Wintrust’s common stock at the fair market value of the stock on the date the options are granted. Options under the 2007 Plan generally vest ratably over periods of three to five years and have a maximum term of seven years from the date of grant. Stock options granted under the 1997 Plan provided for a maximum term of 10 years. Restricted shares entitle the holders to receive, at no cost, shares of the Company’s common stock. Restricted shares generally vest over periods of one to five years from the date of grant.
	The Long-Term Incentive Program (“LTIP”) is designed in part to align the interests of management with the interests of shareholders, foster retention, create a long-term focus based on sustainable results and provide participants a target long-term incentive opportunity. It is administered under the 2007 Plan. Grants have been made pursuant to the LTIP annually since 2011, and it is anticipated that LTIP awards will continue to be granted annually. LTIP grants to date have consisted of time-vested stock options and performance-based stock and cash awards that are contingent upon the achievement of pre-established long-term performance goals set in advance by the Compensation Committee over a three-year period, with overlapping performance periods starting at the beginning of each calendar year. Stock options granted under the LTIP have a term of seven years and vest equally over three years based on continued service. The actual performance-based stock and performance-based cash award payouts will vary based on the achievement of the pre-established targets at the end of the performance period and can range from 0% to 200% of the target award.
	Holders of restricted share awards and performance-based stock awards received under the Plans are not entitled to vote or receive cash dividends (or cash payments equal to the cash dividends) on the underlying common shares until the awards are vested. Except in limited circumstances, these awards are canceled upon termination of employment without any payment of consideration by the Company.
	Stock-based compensation is measured as the fair value of an award on the date of grant, and the measured cost is recognized over the period which the recipient is required to provide service in exchange for the award. The fair values of restricted shares and performance-based stock awards are determined based on the average of the high and low trading prices on the grant date, and the fair value of stock options is estimated using a Black-Scholes option-pricing model that utilizes the assumptions outlined in the following table. Option-pricing models require the input of highly subjective assumptions and are sensitive to changes in the option’s expected life and the price volatility of the underlying stock, which can materially affect the fair value estimate. Options granted in 2011, 2012 and 2013, were primarily granted as LTIP awards. The expected life of the options granted pursuant to the LTIP awards is based on the safe harbor rule of the SEC Staff Accounting Bulletin No. 107 “Share-Based Payment” as the Company believes historical exercise data may not provide a reasonable basis to estimate the expected term of these options. Expected stock price volatility is based on historical volatility of the Company’s common stock, which correlates with the expected life of the options, and the risk-free interest rate is based on comparable U.S. Treasury rates. Management reviews and adjusts the assumptions used to calculate the fair value of an option on a periodic basis to better reflect expected trends.
	The following table presents the weighted average assumptions used to determine the fair value of options granted in the years ending December 31, 2013, 2012 and 2011:
			2013		2012		2011
	Expected dividend yield		0.5	%	0.6	%	0.5	%
	Expected volatility		59	%	62.6	%	61.8	%
	Risk-free rate		1	%	0.7	%	1	%
	Expected option life (in years)		4.5		4.5		4.4
	Stock based compensation is recognized based on the number of awards that are ultimately expected to vest. Forfeitures are estimated based on historical forfeiture experience. For performance-based stock awards, an estimate is made of the number of shares expected to vest as a result of actual performance against the performance criteria to determine the amount of compensation expense to be recognized. The estimate is reevaluated quarterly and total compensation expense is adjusted for any change in the current period.
	Stock-based compensation expense recognized in the Consolidated Statements of Income was $6.7 million, $9.1 million and $5.6 million and the related tax benefits were $2.5 million, $3.3 million and $1.8 million in 2013, 2012 and 2011, respectively.
	A summary of the Plans’ stock option activity for the years ended December 31, 2013, 2012 and 2011 is as follows:
	Stock Options		Common		Weighted Average			Remaining		Intrinsic Value(2)
			Shares		Strike Price			Contractual Term(1)		$0
	Outstanding at January 1, 2011		2,040,701		$	38.92
	Granted		221,003		33.15
	Exercised		(85,706	)	17.2
	Forfeited or canceled		(111,464	)	46.01
	Outstanding at December 31, 2011		2,064,534		$	38.83		2.7		$	3,809
	Exercisable at December 31, 2011		1,779,218		$	39.93		2.3		$	3,558
	Outstanding at January 1, 2012		2,064,534		$	38.83
	Granted		250,997		31.16
	Exercised		(484,709	)	21.43
	Forfeited or canceled		(85,395	)	43.7
	Outstanding at December 31, 2012		1,745,427		$	42.31		3.1		$	3,836
	Exercisable at December 31, 2012		1,346,287		$	45.57		2.3		$	1,677
	Outstanding at January 1, 2013		1,745,427		$	42.31
	Granted		236,120		38.01
	Exercised		(371,826	)	40.46
	Forfeited or canceled		(85,049	)	44.12
	Outstanding at December 31, 2013		1,524,672		$	42		2.6		$	11,021
	Exercisable at December 31, 2013		1,097,836		$	44.82		1.5		$	6,165
	Vested or expected to vest at December 31, 2013		1,522,161		$	42.02
	-1	Represents the weighted average contractual remaining life in years.
	-2	Aggregate intrinsic value represents the total pretax intrinsic value (i.e., the difference between the Company’s stock price at year end and the option exercise price, multiplied by the number of shares) that would have been received by the option holders if they had exercised their options on the last day of the year. Options with exercise prices above the year end stock price are excluded from the calculation of intrinsic value. The intrinsic value will change based on the fair market value of the Company’s stock.
	The weighted average per share grant date fair value of options granted during the years ended December 31, 2013, 2012 and 2011 was $17.49, $15.00 and $15.84, respectively. The aggregate intrinsic value of options exercised during the years ended December 31, 2013, 2012 and 2011, was $1.2 million, $5.4 million and $1.2 million, respectively. The actual tax benefit realized for the tax deductions from option exercises totaled $485,000, $2.1 million and $468,000 for 2013, 2012 and 2011, respectively. Cash received from option exercises under the Plans for the years ended December 31, 2013, 2012 and 2011 was $15.0 million, $10.4 million and $1.5 million, respectively.
	A summary of the Plans’ restricted share and performance-based stock award activity for the years ended December 31, 2013, 2012 and 2011 is as follows:
			2013					2012					2011
	Restricted Shares		Common		Weighted			Common			Weighted		Common		Weighted
			Shares		Average			Shares			Average		Shares		Average
					Grant-Date						Grant-Date				Grant-Date
					Fair Value						Fair Value				Fair Value
	Outstanding at January 1		314,226		$	37.99		336,709			$	38.29	299,040		$	39.44
	Granted		16,932		42.14			111,207			32.37		98,394		32.85
	Vested and issued		(144,860	)	31.83			(132,337	)		34.12		(56,641	)	35.17
	Forfeited		(4,776	)	33.93			(1,353	)		30.99		(4,084	)	34.73
	Outstanding at end of year		181,522		$	43.39		314,226			$	37.99	336,709		$	38.29
	Vested, but not issuable at end of year		85,000		$	51.88		85,000			$	51.88	85,000		$	51.88
	Performance Shares
	Outstanding at January 1		153,915		$	31.78		72,158			$	33.25	—		$	—
	Granted		106,268		37.9			119,476			31.1		100,993		33.25
	Vested and issued		—		—			—			—		—		—
	Net decrease due to estimated performance		(106,005	)	34.17			(33,147	)		32.5		(28,062	)	33.25
	Forfeited		(10,322	)	34.19			(4,572	)		31.98		(773	)	33.28
	Outstanding at end of year		143,856		$	34.37		153,915			$	31.78	72,158		$	33.25
	The number of performance shares granted is reflected in the above table at the 100% target performance level. The actual performance- based award payouts will vary based on the achievement of the pre-established targets and can range from 0% to 200% of the target amount. The outstanding number of performance shares reflected in the table represents the number of shares expected to be awarded based on estimated achievement of the goals as of year end. However, at December 31, 2013, the maximum number of performance-based shares that could be issued if performance is attained at 200% of target based on the grants made to date was approximately 615,000 shares.
	The actual tax benefit realized upon the vesting of restricted shares is based on the fair value of the shares on the vesting date and the estimated tax benefit of the awards is based on fair value of the awards on the grant date. The actual tax benefit realized upon the vesting of restricted shares in 2013, 2012 and 2011 was $329,000, $15,000 and $(72,000), respectively, more/(less) than the estimated tax benefit for those shares. These differences in actual and estimated tax benefits were recorded directly to shareholders’ equity.
	As of December 31, 2013, there was $8.7 million of total unrecognized compensation cost related to non-vested share based arrangements under the Plans. That cost is expected to be recognized over a weighted average period of approximately two years. The total fair value of shares vested during the years ended December 31, 2013, 2012 and 2011 was $7.4 million, $6.4 million and $4.1 million, respectively.
	The Company issues new shares to satisfy its obligation to issue shares granted pursuant to the Plans.
Cash Incentive and Retention Plan
In April 2008, the Company approved a Cash Incentive and Retention Plan (“CIRP”) which allows the Company to provide cash compensation to the Company’s and its subsidiaries’ officers and employees. The CIRP is administered by the Compensation Committee of the Board of Directors. The CIRP generally provides for the grants of cash awards, which may be earned pursuant to the achievement of performance criteria established by the Compensation Committee and/or continued employment. The performance criteria, if any, established by the Compensation Committee must relate to one or more of the criteria specified in the CIRP, which includes: earnings, earnings growth, revenues, stock price, return on assets, return on equity, improvement of financial ratings, achievement of balance sheet or income statement objectives and expenses. These criteria may relate to the Company, a particular line of business or a specific subsidiary of the Company. The Company’s expense related to the CIRP was approximately $115,000, $357,000 and $295,000 in 2013, 2012 and 2011, respectively. In December 2012, the Company paid $1.2 million in vested CIRP awards. No awards were paid in 2013, but $473,000 was paid in January 2014 for awards with performance periods ending in December 2013.
Other Employee Benefits
Wintrust and its subsidiaries also provide 401(k) Retirement Savings Plans (“401(k) Plans”). The 401(k) Plans cover all employees meeting certain eligibility requirements. Contributions by employees are made through salary deferrals at their direction, subject to certain Plan and statutory limitations. Employer contributions to the 401(k) Plans are made at the employer’s discretion. Generally, participants completing 501 hours of service are eligible to share in an allocation of employer contributions. The Company’s expense for the employer contributions to the 401(k) Plans was approximately $4.9 million in 2013, $4.3 million in 2012, and $4.0 million in 2011.
The Wintrust Financial Corporation Employee Stock Purchase Plan (“ESPP”) is designed to encourage greater stock ownership among employees, thereby enhancing employee commitment to the Company. The ESPP gives eligible employees the right to accumulate funds over an offering period to purchase shares of common stock. All shares offered under the ESPP will be either newly issued shares of the Company or shares issued from treasury, if any. In accordance with the ESPP, the purchase price of the shares of common stock may not be lower than the lesser of 85% of the fair market value per share of the common stock on the first day of the offering period or 85% of the fair market value per share of the common stock on the last date for the offering period. The Company’s Board of Directors authorized a purchase price calculation at 90% of fair market value for each of the offering periods. During 2013, 2012 and 2011, a total of 62,096 shares, 66,237 shares and 71,077 shares, respectively, were earned by participants and approximately $355,000, $421,000 and $300,000, respectively, was recognized as compensation expense. The current offering period concludes on March 31, 2014. The Company plans to continue to periodically offer common stock through this ESPP subsequent to March 31, 2014. In May 2012, the Company's shareholders authorized an additional 300,000 shares of common stock that may be offered under the ESPP. At December 31, 2013, the Company had an obligation to issue 13,012 shares of common stock to participants and has 259,020 shares available for future grants under the ESPP.
As a result of the Company's acquisition of HPK in December 2012, the Company assumed the obligations of a noncontributory pension plan, (“the HPK Plan”), that covers approximately 100 participants with benefits based on years of service and compensation prior to retirement. The HPK Plan was “frozen” as of December 31, 2006, with no additional years of credit earned for service or compensation paid. As of December 31, 2013, the projected benefit obligation was $6.7 million and the fair value of the plan's assets was $5.9 million. Similarly, in connection with the Company's acquisition of Diamond in October 2013, the Company assumed the obligation of Diamond's pension plan, which covers approximately 35 participants. The Diamond Plan was frozen as of December 31, 2004, and only service and compensation prior to this date is considered in determining benefits. As of December 31, 2013, the projected benefit obligation was $3.3 million and the fair value of the plan's assets was $2.9 million. The Company has accrued liabilities for these plans and is in the process of terminating both of these pension plans.
The Company does not currently offer other postretirement benefits such as health care or other pension plans.
Directors Deferred Fee and Stock Plan
The Wintrust Financial Corporation Directors Deferred Fee and Stock Plan (“DDFS Plan”) allows directors of the Company and its subsidiaries to choose to receive payment of directors’ fees in either cash or common stock of the Company and to defer the receipt of the fees. The DDFS Plan is designed to encourage stock ownership by directors. All shares offered under the DDFS Plan will be either newly issued shares of the Company or shares issued from treasury. The number of shares issued is determined on a quarterly basis based on the fees earned during the quarter and the fair market value per share of the common stock on the last trading day of the preceding quarter. The shares are issued annually and the directors are entitled to dividends and voting rights upon the issuance of the shares. During 2013, 2012 and 2011, a total of 30,547 shares, 22,220 shares and 25,242 shares, respectively, were issued to directors. For those directors that elect to defer the receipt of the common stock, the Company maintains records of stock units representing an obligation to issue shares of common stock. The number of stock units equals the number of shares that would have been issued had the director not elected to defer receipt of the shares. Additional stock units are credited at the time dividends are paid, however no voting rights are associated with the stock units. The shares of common stock represented by the stock units are issued in the year specified by the directors in their participation agreements. At December 31, 2013, the Company has an obligation to issue 251,523 shares of common stock to directors and has 66,282 shares available for future grants under the DDFS Plan.

Regulatory_Matters

Regulatory Matters	12 Months Ended
	Dec. 31, 2013
Regulatory Capital Requirements [Abstract]	'
Regulatory Matters	'
	Regulatory Matters
	Banking laws place restrictions upon the amount of dividends which can be paid to Wintrust by the banks. Based on these laws, the banks could, subject to minimum capital requirements, declare dividends to Wintrust without obtaining regulatory approval in an amount not exceeding (a) undivided profits, and (b) the amount of net income reduced by dividends paid for the current and prior two years. During 2013, 2012 and 2011, cash dividends totaling $112.8 million, $45.0 million and $27.8 million, respectively, were paid to Wintrust by the banks. As of January 1, 2013, the banks had approximately $147.4 million available to be paid as dividends to Wintrust without prior regulatory approval and without reducing their capital below the well-capitalized level.
	The banks are also required by the Federal Reserve Act to maintain reserves against deposits. Reserves are held either in the form of vault cash or balances maintained with the Federal Reserve Bank and are based on the average daily deposit balances and statutory reserve ratios prescribed by the type of deposit account. At December 31, 2013 and 2012, reserve balances of approximately $213.2 million and $160.2 million, respectively, were required to be maintained at the Federal Reserve Bank.
	The Company and the banks are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory — and possibly additional discretionary—actions by regulators that, if undertaken, could have a direct material effect on the Company’s financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company and the banks must meet specific capital guidelines that involve quantitative measures of the Company’s assets, liabilities, and certain off-balance-sheet items as calculated under regulatory accounting practices. The Company’s and the banks’ capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings, and other factors.
	Quantitative measures established by regulation to ensure capital adequacy require the Company and the banks to maintain minimum amounts and ratios of total and Tier 1 capital (as defined in the regulations) to risk-weighted assets (as defined) and Tier 1 leverage capital (as defined) to average quarterly assets (as defined).
	The Federal Reserve’s capital guidelines require bank holding companies to maintain a minimum ratio of qualifying total capital to risk-weighted assets of 8.0%, of which at least 4.0% must be in the form of Tier 1 Capital. The Federal Reserve also requires a minimum tangible Tier 1 leverage ratio (Tier 1 Capital to total assets) of 3.0% for strong bank holding companies (those rated a composite “1” under the Federal Reserve’s rating system). For all other banking holding companies, the minimum tangible Tier 1 leverage ratio is 4.0%. In addition, the Federal Reserve continues to consider the tangible Tier 1 leverage ratio in evaluating proposals for expansion or new activities. As reflected in the following table, the Company met all minimum capital requirements at December 31, 2013 and 2012:
		2013		2012
	Total Capital to Risk Weighted Assets	12.9	%	13.1	%
	Tier 1 Capital to Risk Weighted Assets	12.2	%	12.1	%
	Tier 1 Leverage Ratio	10.5	%	10	%
	Wintrust is designated as a financial holding company. Bank holding companies approved as financial holding companies may engage in an expanded range of activities, including the businesses conducted by its wealth management subsidiaries. As a financial holding company, Wintrust’s banks are required to maintain their capital positions at the “well-capitalized” level. As of December 31, 2013, the banks were categorized as well capitalized under the regulatory framework for prompt corrective action. The ratios required for the banks to be “well capitalized” by regulatory definition are 10.0%, 6.0%, and 5.0% for Total Capital to Risk-Weighted Assets, Tier 1 Capital to Risk-Weighted Assets and Tier 1 Leverage Ratio, respectively.
	The banks’ actual capital amounts and ratios as of December 31, 2013 and 2012 are presented in the following table:
	(Dollars in thousands)	December 31, 2013									December 31, 2012
		Actual					To Be Well				Actual				To Be Well
							Capitalized by								Capitalized by
							Regulatory Definition								Regulatory Definition
		Amount			Ratio		Amount		Ratio		Amount		Ratio		Amount		Ratio
	Total Capital (to Risk Weighted Assets):
	Lake Forest Bank	$	236,055		11.7	%	$	202,443	10	%	$	226,234	11	%	$	205,188	10	%
	Hinsdale Bank	152,266			11.4		134,106		10		154,677		12.2		126,837		10
	North Shore Community Bank	232,454			11.6		200,806		10		202,823		11.5		176,124		10
	Libertyville Bank	111,396			11.4		97,777		10		116,818		11.9		97,880		10
	Barrington Bank	128,924			11		117,103		10		148,382		13.5		109,526		10
	Crystal Lake Bank	85,922			13		66,066		10		84,310		14.5		58,091		10
	Northbrook Bank	142,512			11		130,208		10		139,603		12.2		114,057		10
	Schaumburg Bank	70,728			11.4		62,130		10		68,305		11.8		57,946		10
	Village Bank	95,359			11		86,435		10		92,787		11.5		80,441		10
	Beverly Bank	70,754			11.2		63,251		10		61,994		11.1		55,697		10
	Town Bank	85,647			11.2		76,234		10		83,144		11.5		72,373		10
	Wheaton Bank	77,177			13		59,354		10		71,097		13.6		52,450		10
	State Bank of the Lakes	73,248			11.9		61,698		10		71,178		11.5		61,886		10
	Old Plank Trail Bank	96,495			12.7		75,834		10		74,445		14.7		50,582		10
	St. Charles Bank	71,170			11.4		62,669		10		66,079		11.3		58,341		10
	Tier 1 Capital (to Risk Weighted Assets):
	Lake Forest Bank	$	222,577		11	%	$	121,466	6	%	$	209,699	10.2	%	$	123,113	6	%
	Hinsdale Bank	144,196			10.8		80,463		6		145,380		11.5		76,102		6
	North Shore Community Bank	162,903			8.1		120,484		6		145,488		8.3		105,675		6
	Libertyville Bank	103,895			10.6		58,666		6		105,251		10.8		58,728		6
	Barrington Bank	122,664			10.5		70,262		6		140,037		12.8		65,716		6
	Crystal Lake Bank	79,878			12.1		39,640		6		77,962		13.4		34,855		6
	Northbrook Bank	131,591			10.1		78,125		6		125,192		11		68,434		6
	Schaumburg Bank	64,263			10.3		37,278		6		62,538		10.8		34,768		6
	Village Bank	88,961			10.3		51,861		6		86,435		10.7		48,265		6
	Beverly Bank	65,385			10.3		37,951		6		59,440		10.7		33,418		6
	Town Bank	79,843			10.5		45,741		6		76,824		10.6		43,424		6
	Wheaton Bank	69,730			11.8		35,613		6		64,509		12.3		31,470		6
	State Bank of the Lakes	68,399			11.1		37,019		6		61,521		9.9		37,131		6
	Old Plank Trail Bank	92,694			12.2		45,500		6		66,170		13.1		30,349		6
	St. Charles Bank	64,922			10.4		37,601		6		60,753		10.4		35,004		6
	Tier 1 Leverage Ratio:
	Lake Forest Bank	$	222,577		9.6	%	$	116,340	5	%	$	209,699	8.8	%	$	119,601	5	%
	Hinsdale Bank	144,196			9.5		75,822		5		145,380		8.7		83,238		5
	North Shore Community Bank	162,903			7.2		113,580		5		145,488		7.2		101,553		5
	Libertyville Bank	103,895			9.2		56,703		5		105,251		8.9		59,379		5
	Barrington Bank	122,664			8.9		69,270		5		140,037		9.7		72,531		5
	Crystal Lake Bank	79,878			10.2		39,108		5		77,962		10.3		37,971		5
	Northbrook Bank	131,591			8.1		80,876		5		125,192		7.5		83,244		5
	Schaumburg Bank	64,263			9		35,571		5		62,538		8.7		36,061		5
	Village Bank	88,961			9.4		47,549		5		86,435		9		48,068		5
	Beverly Bank	65,385			8.8		37,281		5		59,440		12.3		24,127		5
	Town Bank	79,843			9.5		42,164		5		76,824		9.4		40,671		5
	Wheaton Bank	69,730			9.3		37,498		5		64,509		8.9		36,205		5
	State Bank of the Lakes	68,399			9.8		34,784		5		61,521		8.4		36,570		5
Old Plank Trail Bank	92,694			8.7		53,603		5		66,170		8.9		37,380		5
St. Charles Bank	64,922			9.6		33,975		5		60,753		9.4		32,170		5
Wintrust’s mortgage banking division and broker/dealer subsidiary are also required to maintain minimum net worth capital requirements with various governmental agencies. The mortgage banking division’s net worth requirements are governed by the Department of Housing and Urban Development and the broker/dealer’s net worth requirements are governed by the SEC. As of December 31, 2013, these business units met their minimum net worth capital requirements.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	Commitments and Contingencies
	The Company has outstanding, at any time, a number of commitments to extend credit. These commitments include revolving home equity line and other credit agreements, term loan commitments and standby and commercial letters of credit. Standby and commercial letters of credit are conditional commitments issued to guarantee the performance of a customer to a third party. Standby letters of credit are contingent upon the failure of the customer to perform according to the terms of the underlying contract with the third party, while commercial letters of credit are issued specifically to facilitate commerce and typically result in the commitment being drawn on when the underlying transaction is consummated between the customer and the third party.
	These commitments involve, to varying degrees, elements of credit and interest rate risk in excess of the amounts recognized in the Consolidated Statements of Condition. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Company uses the same credit policies in making commitments as it does for on-balance sheet instruments. Commitments to extend commercial, commercial real estate and construction loans totaled $2.7 billion and $2.6 billion as of December 31, 2013 and 2012, respectively, and unused home equity lines totaled $747.1 million and $750.9 million as of December 31, 2013 and 2012, respectively. Standby and commercial letters of credit totaled $166.2 million at December 31, 2013 and $174.3 million at December 31, 2012.
	In addition, at December 31, 2013 and 2012, the Company had approximately $194.3 million and $457.7 million, respectively, in commitments to fund residential mortgage loans to be sold into the secondary market. These lending commitments are also considered derivative instruments. The Company also enters into forward contracts for the future delivery of residential mortgage loans at specified interest rates to reduce the interest rate risk associated with commitments to fund loans as well as mortgage loans held-for-sale. These forward contracts are also considered derivative instruments and had contractual amounts of approximately $472.1 million at December 31, 2013 and $858.1 million at December 31, 2012. See Note 22 for further discussion on derivative instruments.
	The Company enters into residential mortgage loan sale agreements with investors in the normal course of business. These agreements usually require certain representations concerning credit information, loan documentation, collateral and insurability. On occasion, investors have requested the Company to indemnify them against losses on certain loans or to repurchase loans which the investors believe do not comply with applicable representations. Management maintains a liability for estimated losses on loans expected to be repurchased or on which indemnification is expected to be provided and regularly evaluates the adequacy of this recourse liability based on trends in repurchase and indemnification requests, actual loss experience, known and inherent risks in the loans, and current economic conditions.
	The Company sold approximately $3.7 billion of mortgage loans in 2013 and $3.9 billion in 2012. The liability for estimated losses on repurchase and indemnification claims for residential mortgage loans previously sold to investors was $3.8 million and $4.3 million at December 31, 2013 and 2012, respectively, and was included in other liabilities on the Consolidated Statements of Condition. Losses charged against the liability were $327,000 in 2013 as compared to $284,000 in 2012. These losses primarily relate to mortgages obtained through wholesale and correspondent channels which experienced early payment and other defaults meeting certain representation and warranty recourse requirements.
	The Company utilizes an out-sourced securities clearing platform and has agreed to indemnify the clearing broker of WHI for losses that it may sustain from the customer accounts introduced by WHI. As of December 31, 2013, the total amount of customer balances maintained by the clearing broker and subject to indemnification was approximately $29.9 million. WHI seeks to control the risks associated with its customers’ activities by requiring customers to maintain margin collateral in compliance with various regulatory and internal guidelines.
	In the ordinary course of business, there are legal proceedings pending against the Company and its subsidiaries. Management does not believe that a material loss related to these matters is reasonably possible.

Derivative_Financial_Instrumen

Derivative Financial Instruments	12 Months Ended
	Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Derivative Financial Instruments	'
	Derivative Financial Instruments
	The Company primarily enters into derivative financial instruments as part of its strategy to manage its exposure to changes in interest rates. Derivative instruments represent contracts between parties that result in one party delivering cash to the other party based on a notional amount and an underlying (such as a rate, security price or price index) as specified in the contract. The amount of cash delivered from one party to the other is determined based on the interaction of the notional amount of the contract with the underlying. Derivatives are also implicit in certain contracts and commitments.
	The derivative financial instruments currently used by the Company to manage its exposure to interest rate risk include: (1) interest rate swaps and caps to manage the interest rate risk of certain fixed and variable rate assets and variable rate liabilities; (2) interest rate lock commitments provided to customers to fund certain mortgage loans to be sold into the secondary market; (3) forward commitments for the future delivery of such mortgage loans to protect the Company from adverse changes in interest rates and corresponding changes in the value of mortgage loans available-for-sale; and (4) covered call options to economically hedge specific investment securities and receive fee income effectively enhancing the overall yield on such securities. The Company also enters into derivatives (typically interest rate swaps) with certain qualified borrowers to facilitate the borrowers’ risk management strategies and concurrently enters into mirror-image derivatives with a third party counterparty, effectively making a market in the derivatives for such borrowers. Additionally, the Company enters into foreign currency contracts to manage foreign exchange risk associated with certain foreign currency denominated assets.
	The Company has purchased interest rate cap derivatives to hedge or manage its own risk exposures. Certain interest rate cap derivatives have been designated as cash flow hedge derivatives of the variable cash outflows associated with interest expense on the Company’s junior subordinated debentures. Other cap derivatives are not designated for hedge accounting but are economic hedges of the Company's overall portfolio, therefore any mark to market changes in the value of these caps are recognized in earnings.
	Below is a summary of the interest rate cap derivatives held by the Company as of December 31, 2013:
	(Dollars in thousands)
			Notional			Accounting	Fair Value as of
	Effective Date	Maturity Date	Amount			Treatment	31-Dec-13
	30-Sep-11	30-Sep-14	$	20,000		Cash Flow Hedging	$	—
	30-Sep-11	30-Sep-14	40,000			Cash Flow Hedging	—
	3-May-12	3-May-15	77,000			Non-Hedge Designated	3
	3-May-12	3-May-16	215,000			Non-Hedge Designated	532
	1-Jun-12	1-Apr-15	96,530			Non-Hedge Designated	2
	29-Aug-12	29-Aug-16	216,500			Non-Hedge Designated	979
	22-Feb-13	22-Aug-16	100,000			Non-Hedge Designated	526
	21-Mar-13	21-Mar-17	100,000			Non-Hedge Designated	1,158
	16-May-13	16-Nov-16	75,000			Non-Hedge Designated	558
	15-Sep-13	15-Sep-17	50,000			Cash Flow Hedging	970
	30-Sep-13	30-Sep-17	40,000			Cash Flow Hedging	806
			$	1,030,030			$	5,534
	The Company recognizes derivative financial instruments in the consolidated financial statements at fair value regardless of the purpose or intent for holding the instrument. The Company records derivative assets and derivative liabilities on the Consolidated Statements of Condition within accrued interest receivable and other assets and accrued interest payable and other liabilities, respectively. Changes in the fair value of derivative financial instruments are either recognized in income or in shareholders’ equity as a component of other comprehensive income depending on whether the derivative financial instrument qualifies for hedge accounting and, if so, whether it qualifies as a fair value hedge or cash flow hedge. Generally, changes in fair values of derivatives accounted for as fair value hedges are recorded in income in the same period and in the same income statement line as changes in the fair values of the hedged items that relate to the hedged risk(s). Changes in fair values of derivative financial instruments accounted for as cash flow hedges, to the extent they are effective hedges, are recorded as a component of other comprehensive income, net of deferred taxes, and reclassified to earnings when the hedged transaction affects earnings. Changes in fair values of derivative financial instruments not designated in a hedging relationship pursuant to ASC 815, including changes in fair value related to the ineffective portion of cash flow hedges, are reported in non-interest income during the period of the change. Derivative financial instruments are valued by a third party and are corroborated by comparison with valuations provided by the respective counterparties. Fair values of certain mortgage banking derivatives (interest rate lock commitments and forward commitments to sell mortgage loans on a best efforts basis) are estimated based on changes in mortgage interest rates from the date of the loan commitment. The fair value of foreign currency derivatives is computed based on changes in foreign currency rates stated in the contract compared to those prevailing at the measurement date.
	The table below presents the fair value of the Company’s derivative financial instruments as of December 31, 2013 and December 31, 2012:
		Derivative Assets									Derivative Liabilities
		Fair Value									Fair Value
	(Dollars in thousands)		December 31, 2013				December 31, 2012					December 31, 2013				December 31, 2012
	Derivatives designated as hedging instruments under ASC 815:
	Interest rate derivatives designated as Cash Flow Hedges		$	1,776			$	2				$	3,160			$	7,988
	Interest rate derivatives designated as Fair Value Hedges		$	107			$	104				$	1			$	—
	Total derivatives designated as hedging instruments under ASC 815		$	1,883			$	106				$	3,161			$	7,988
	Derivatives not designated as hedging instruments under ASC 815:
	Interest rate derivatives		36,073				47,440					31,646				45,767
	Interest rate lock commitments		7,500				6,069					147				937
	Forward commitments to sell mortgage loans		2,761				277					2,310				3,057
	Foreign exchange contracts		4				14					—				2
	Total derivatives not designated as hedging instruments under ASC 815		$	46,338			$	53,800				$	34,103			$	49,763
	Total derivatives		$	48,221			$	53,906				$	37,264			$	57,751
	Cash Flow Hedges of Interest Rate Risk
	The Company’s objectives in using interest rate derivatives are to add stability to net interest income and to manage its exposure to interest rate movements. To accomplish these objectives, the Company primarily uses interest rate swaps and interest rate caps as part of its interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable-rate amounts from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreements without the exchange of the underlying notional amount. Interest rate caps designated as cash flow hedges involve the receipt of payments at the end of each period in which the interest rate specified in the contract exceeds the agreed upon strike price.
	As of December 31, 2013, the Company had two interest rate swaps and four interest rate caps with an aggregate notional amount of $225 million that were designated as cash flow hedges of interest rate risk. The table below provides details on each of these cash flow hedges as of December 31, 2013:
	(Dollars in thousands)		31-Dec-13
	Maturity Date		Notional				Fair Value
			Amount				Asset (Liability)
	Interest Rate Swaps:
	Sep-16		50,000				(2,083		)
	Oct-16		25,000				(1,077		)
	Total Interest Rate Swaps		75,000				(3,160		)
	Interest Rate Caps:
	Sep-14		20,000				—
	Sep-14		40,000				—
	Sep-17		50,000				970
	Sep-17		40,000				806
	Total Interest Rate Caps		150,000				1,776
	Total Cash Flow Hedges		$	225,000			$	(1,384	)
	Since entering into these interest rate derivatives, the Company has used them to hedge the variable cash outflows associated with interest expense on the Company’s junior subordinated debentures. The effective portion of changes in the fair value of these cash flow hedges is recorded in accumulated other comprehensive income and is subsequently reclassified to interest expense as interest payments are made on the Company’s variable rate junior subordinated debentures. The changes in fair value (net of tax) are separately disclosed in the Consolidated Statements of Comprehensive Income. The ineffective portion of the change in fair value of these derivatives is recognized directly in earnings; however, no hedge ineffectiveness was recognized during 2013 or 2012. The Company uses the hypothetical derivative method to assess and measure effectiveness.
	A rollforward of the amounts in accumulated other comprehensive income related to interest rate derivatives designated as cash flow hedges follows:
			December 31,
	(Dollars in thousands)		2013				2012
	Unrealized loss at beginning of period		$	(8,673	)		$	(11,633	)
	Amount reclassified from accumulated other comprehensive income to interest expense on junior subordinated debentures		5,115				5,850
	Amount of loss recognized in other comprehensive income		(413		)		(2,890		)
	Unrealized loss at end of period		$	(3,971	)		$	(8,673	)
	As of December 31, 2013, the Company estimates that during the next twelve months, $1.9 million will be reclassified from accumulated other comprehensive income as an increase to interest expense.
	Fair Value Hedges of Interest Rate Risk
Interest rate swaps designated as fair value hedges involve the payment of fixed amounts to a counterparty in exchange for the Company receiving variable payments over the life of the agreements without the exchange of the underlying notional amount. As of December 31, 2013, the Company has three interest rate swaps with an aggregate notional amount of $6.1 million that were designated as fair value hedges associated with fixed rate commercial franchise loans.
For derivatives designated and that qualify as fair value hedges, the gain or loss on the derivative as well as the offsetting loss or gain on the hedged item attributable to the hedged risk are recognized in earnings. The Company includes the gain or loss on the hedged item in the same line item as the offsetting loss or gain on the related derivatives. The Company recognized net gains of $12,000 in other income related to hedge ineffectiveness for the year ended December 31, 2013. The Company also recognized net decreases in interest income of $28,000 in 2013 related to net settlements on the derivatives.
On June 1, 2013, the Company de-designated a $96.5 million cap which was previously designated as a fair value hedge of interest rate risk associated with an embedded cap in one of the Company’s floating rate loans. The hedged loan was restructured which resulted in the interest rate cap no longer qualifying as an effective fair value hedge. As such, the interest rate cap derivative is no longer accounted for under hedge accounting and all changes in value subsequent to June 1, 2013 are recorded in earnings. Additionally, in the year ended December 31, 2013 the Company recorded amortization of the basis in the previously hedged item as a reduction to interest income of $192,000.
The following table presents the gain/(loss) and hedge ineffectiveness recognized on derivative instruments and the related hedged items that are designated as a fair value hedge accounting relationship as of December 31, 2013 and 2012:
(Dollars in thousands)	Location of Gain or (Loss)		Amount of Gain or (Loss) Recognized							Amount of Gain or (Loss) Recognized							Income Statement Gain/
	Recognized in Income on		in Income on Derivative							in Income on Hedged Item							(Loss) due to Hedge
	Derivative		Year Ended December 31,							Year Ended December 31,							Ineffectiveness
																	Year Ended December 31,
Derivatives in Fair Value
Hedging Relationships			2013				2012			2013				2012			2013		2012
Interest rate products	Other income		$	67			(480	)		$	(55	)		535			$	12	55
Non-Designated Hedges
The Company does not use derivatives for speculative purposes. Derivatives not designated as hedges are used to manage the Company’s exposure to interest rate movements and other identified risks but do not meet the strict hedge accounting requirements of ASC 815. Changes in the fair value of derivatives not designated in hedging relationships are recorded directly in earnings.
Interest Rate Derivatives—The Company has interest rate derivatives, including swaps and option products, resulting from a service the Company provides to certain qualified borrowers. The Company’s banking subsidiaries execute certain derivative products (typically interest rate swaps) directly with qualified commercial borrowers to facilitate their respective risk management strategies. For example, these arrangements allow the Company’s commercial borrowers to effectively convert a variable rate loan to a fixed rate. In order to minimize the Company’s exposure on these transactions, the Company simultaneously executes offsetting derivatives with third parties. In most cases, the offsetting derivatives have mirror-image terms, which result in the positions’ changes in fair value substantially offsetting through earnings each period. However, to the extent that the derivatives are not a mirror-image and because of differences in counterparty credit risk, changes in fair value will not completely offset resulting in some earnings impact each period. Changes in the fair value of these derivatives are included in other non-interest income. At December 31, 2013, the Company had interest rate derivative transactions with an aggregate notional amount of approximately $2.8 billion (all interest rate swaps and caps with customers and third parties) related to this program. These interest rate derivatives had maturity dates ranging from February 2014 to January 2033.
Mortgage Banking Derivatives—These derivatives include interest rate lock commitments provided to customers to fund certain mortgage loans to be sold into the secondary market and forward commitments for the future delivery of such loans. It is the Company’s practice to enter into forward commitments for the future delivery of a portion of our residential mortgage loan production when interest rate lock commitments are entered into in order to economically hedge the effect of future changes in interest rates on its commitments to fund the loans as well as on its portfolio of mortgage loans held-for-sale. The Company’s mortgage banking derivatives have not been designated as being in hedge relationships. At December 31, 2013, the Company had forward commitments to sell mortgage loans with an aggregate notional amount of approximately $472.1 million and interest rate lock commitments with an aggregate notional amount of approximately $194.3 million. Additionally, the Company’s total mortgage loans held-for-sale at December 31, 2013 was $334.3 million. The fair values of these derivatives were estimated based on changes in mortgage rates from the dates of the commitments. Changes in the fair value of these mortgage banking derivatives are included in mortgage banking revenue.
Foreign Currency Derivatives—These derivatives include foreign currency contracts used to manage the foreign exchange risk associated with foreign currency denominated assets and transactions. Foreign currency contracts, which include spot and forward contracts, represent agreements to exchange the currency of one country for the currency of another country at an agreed-upon price on an agreed-upon settlement date. As a result of fluctuations in foreign currencies, the U.S. dollar-equivalent value of the foreign currency denominated assets or forecasted transactions increase or decrease. Gains or losses on the derivative instruments related to these foreign currency denominated assets or forecasted transactions are expected to substantially offset this variability. As of December 31, 2013 the Company held foreign currency derivatives with an aggregate notional amount of approximately $1.0 million.
Other Derivatives—Periodically, the Company will sell options to a bank or dealer for the right to purchase certain securities held within the banks’ investment portfolios (covered call options). These option transactions are designed primarily as an economic hedge to increase the total return associated with the investment securities portfolio. These options do not qualify as hedges pursuant to ASC 815, and, accordingly, changes in fair value of these contracts are recognized as other non-interest income. There were no covered call options outstanding as of December 31, 2013 or December 31, 2012.
As discussed above, the Company has entered into interest rate cap derivatives to protect the Company in a rising rate environment against increased margin compression due to the repricing of variable rate liabilities and lack of repricing of fixed rate loans and/or securities. The Company entered into three interest rate cap derivative contracts in the second quarter of 2012 (one of which was initially designated as a fair value hedge), one interest rate cap derivative contract in the third quarter of 2012, two interest rate cap derivative contracts in the first quarter of 2013 and one interest rate cap derivative contract in the second quarter of 2013 (see summary earlier in the footnote). As of December 31, 2013, the seven interest rate cap derivative contracts, which are not designated in hedge relationships, have an aggregate notional value of $880.0 million.
Amounts included in the Consolidated Statements of Income related to derivative instruments not designated in hedge relationships were as follows:
(Dollars in thousands)				December 31,
Derivative		Location in income statement		2013				2012
Interest rate swaps and caps		Other income		$	853			$	(1,974	)
Mortgage banking derivatives		Mortgage banking revenue		6,026				1,659
Covered call options		Fees from covered call options		4,773				10,476
Foreign exchange contracts		Other income		(11		)		12
Credit Risk
Derivative instruments have inherent risks, primarily market risk and credit risk. Market risk is associated with changes in interest rates and credit risk relates to the risk that the counterparty will fail to perform according to the terms of the agreement. The amounts potentially subject to market and credit risks are the streams of interest payments under the contracts and the market value of the derivative instrument and not the notional principal amounts used to express the volume of the transactions. Market and credit risks are managed and monitored as part of the Company’s overall asset-liability management process, except that the credit risk related to derivatives entered into with certain qualified borrowers is managed through the Company’s standard loan underwriting process since these derivatives are secured through collateral provided by the loan agreements. Actual exposures are monitored against various types of credit limits established to contain risk within parameters. When deemed necessary, appropriate types and amounts of collateral are obtained to minimize credit exposure.
The Company has agreements with certain of its interest rate derivative counterparties that contain cross-default provisions, which provide that if the Company defaults on any of its indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender, then the Company could also be declared in default on its derivative obligations. The Company also has agreements with certain of its derivative counterparties that contain a provision allowing the counterparty to terminate the derivative positions if the Company fails to maintain its status as a well or adequately capitalized institution, which would require the Company to settle its obligations under the agreements. As of December 31, 2013 the fair value of interest rate derivatives in a net liability position, which includes accrued interest related to these agreements, was $23.1 million. If the Company had breached any of these provisions at December 31, 2013 it would have been required to settle its obligations under the agreements at the termination value and would have been required to pay any additional amounts due in excess of amounts previously posted as collateral with the respective counterparty.
The Company is also exposed to the credit risk of its commercial borrowers who are counterparties to interest rate derivatives with the banks. This counterparty risk related to the commercial borrowers is managed and monitored through the banks’ standard underwriting process applicable to loans since these derivatives are secured through collateral provided by the loan agreement. The counterparty risk associated with the mirror-image swaps executed with third parties is monitored and managed in connection with the Company’s overall asset liability management process.
The Company records interest rate derivatives subject to master netting agreements at their gross value and does not offset derivative assets and liabilities on the Consolidated Statements of Condition. The tables below summarize the Company's interest rate derivatives and offsetting positions as of the dates shown.
	Derivative Assets								Derivative Liabilities
	Fair Value								Fair Value
(Dollars in thousands)	31-Dec-13				31-Dec-12				31-Dec-13				31-Dec-12
Gross Amounts Recognized	$	37,956			$	47,546			$	34,807			$	53,755
Less: Amounts offset in the Statements of Condition	$	—			$	—			$	—			$	—
Net amount presented in the Statements of Condition	$	37,956			$	47,546			$	34,807			$	53,755
Gross amounts not offset in the Statements of Condition
Offsetting Derivative Positions	(8,826		)		(339		)		(8,826		)		(339		)
Securities Collateral Posted (1)	—				—				(25,981		)		(46,811		)
Cash Collateral Posted	—				—				—				(6,605		)
Net Credit Exposure	$	29,130			$	47,207			$	—			$	—
(1) As of December 31, 2013 and 2012, the Company posted securities collateral of $34.6 million and $49.9 million, respectively which resulted in excess collateral with its counterparties. For purposes of this disclosure, the amount of posted collateral is limited to the amount offsetting the derivative liability.

Fair_Value_of_Assets_and_Liabi

Fair Value of Assets and Liabilities	12 Months Ended
	Dec. 31, 2013
Fair Value Disclosures [Abstract]	'
Fair Value of Assets and Liabilities	'
	Fair Value of Assets and Liabilities
	The Company measures, monitors and discloses certain of its assets and liabilities on a fair value basis. These financial assets and financial liabilities are measured at fair value in three levels, based on the markets in which the assets and liabilities are traded and the observability of the inputs used to determine fair value. These levels are:
	•	Level 1 — unadjusted quoted prices in active markets for identical assets or liabilities.
	•	Level 2 — inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. These include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability or inputs that are derived principally from or corroborated by observable market data by correlation or other means.
	•	Level 3 — significant unobservable inputs that reflect the Company’s own assumptions that market participants would use in pricing the assets or liabilities. Level 3 assets and liabilities include financial instruments whose value is determined using pricing models, discounted cash flow methodologies, or similar techniques, as well as instruments for which the determination of fair value requires significant management judgment or estimation.
	A financial instrument’s categorization within the above valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment, and considers factors specific to the assets or liabilities. Following is a description of the valuation methodologies used for the Company’s assets and liabilities measured at fair value on a recurring basis.
	Available-for-sale and trading account securities—Fair values for available-for-sale and trading securities are typically based on prices obtained from independent pricing vendors. Securities measured with these valuation techniques are generally classified as Level 2 of the fair value hierarchy. Typically, standard inputs such as benchmark yields, reported trades for similar securities, issuer spreads, benchmark securities, bids, offers and reference data including market research publications are used to fair value a security. When these inputs are not available, broker/dealer quotes may be obtained by the vendor to determine the fair value of the security. We review the vendor’s pricing methodologies to determine if observable market information is being used, versus unobservable inputs. Fair value measurements using significant inputs that are unobservable in the market due to limited activity or a less liquid market are classified as Level 3 in the fair value hierarchy.
	The Company’s Investment Operations Department is responsible for the valuation of Level 3 available-for-sale securities. The methodology and variables used as inputs in pricing Level 3 securities are derived from a combination of observable and unobservable inputs. The unobservable inputs are determined through internal assumptions that may vary from period to period due to external factors, such as market movement and credit rating adjustments.
	At December 31, 2013, the Company classified $36.4 million of municipal securities as Level 3. These municipal securities are bond issues for various municipal government entities, including park districts, located in the Chicago metropolitan area and southeastern Wisconsin and are privately placed, non-rated bonds without CUSIP numbers. The Company’s methodology for pricing the non-rated bonds focuses on three distinct inputs: equivalent rating, yield and other pricing terms. To determine the rating for a given non-rated municipal bond, the Investment Operations Department references a publicly issued bond by the same issuer if available. A reduction is then applied to the rating obtained from the comparable bond, as the Company believes if liquidated, a non-rated bond would be valued less than a similar bond with a verifiable rating. The reduction applied by the Company is one complete rating grade (i.e. a “AA” rating for a comparable bond would be reduced to “A” for the Company’s valuation). In 2013, all of the ratings derived in the above process by Investment Operations were BBB or better, for both bonds with and without comparable bond proxies. The fair value measurement of municipal bonds is sensitive to the rating input, as a higher rating typically results in an increased valuation. The remaining pricing inputs used in the bond valuation are observable. Based on the rating determined in the above process, Investment Operations obtains a corresponding current market yield curve available to market participants. Other terms including coupon, maturity date, redemption price, number of coupon payments per year, and accrual method are obtained from the individual bond term sheets. Certain municipal bonds held by the Company at December 31, 2013 have a call date that has passed, and are now continuously callable. When valuing these bonds, the fair value is capped at par value as the Company assumes a market participant would not pay more than par for a continuously callable bond.
	At December 31, 2013, the Company held $22.2 million of other equity securities classified as Level 3. The securities in Level 3 are primarily comprised of auction rate preferred securities. The Company utilizes an independent pricing vendor to provide a fair market valuation of these securities. The vendor’s valuation methodology includes modeling the contractual cash flows of the underlying preferred securities and applying a discount to these cash flows by a credit spread derived from the market price of the securities underlying debt. At December 31, 2013, the vendor considered five different securities whose implied credit spreads were believed to provide a proxy for the Company’s auction rate preferred securities. The credit spreads ranged from 1.94%-3.06% with an average of 2.54% which was added to three-month LIBOR to be used as the discount rate input to the vendor’s model. Fair value of the securities is sensitive to the discount rate utilized as a higher discount rate results in a decreased fair value measurement.
	Mortgage loans held-for-sale—Mortgage loans originated by Wintrust Mortgage are carried at fair value. The fair value of mortgage loans held-for-sale is determined by reference to investor price sheets for loan products with similar characteristics.
	Mortgage servicing rights—Fair value for mortgage servicing rights is determined utilizing a third party valuation model which stratifies the servicing rights into pools based on product type and interest rate. The fair value of each servicing rights pool is calculated based on the present value of estimated future cash flows using a discount rate commensurate with the risk associated with that pool, given current market conditions. At December 31, 2013, the Company classified $8.9 million of mortgage servicing rights as Level 3. The weighted average discount rate used as an input to value the pool of mortgage servicing rights at December 31, 2013 was 10.16% with discount rates applied ranging from 10%-13.5%. The higher the rate utilized to discount estimated future cash flows, the lower the fair value measurement. Additionally, fair value estimates include assumptions about prepayment speeds which ranged from 10%-15% or a weighted average prepayment speed of 11.94% used as an input to value the pool of mortgage servicing rights at December 31, 2013. Prepayment speeds are inversely related to the fair value of mortgage servicing rights as an increase in prepayment speeds results in a decreased valuation.
	Derivative instruments—The Company’s derivative instruments include interest rate swaps and caps, commitments to fund mortgages for sale into the secondary market (interest rate locks), forward commitments to end investors for the sale of mortgage loans and foreign currency contracts. Interest rate swaps and caps are valued by a third party, using models that primarily use market observable inputs, such as yield curves, and are validated by comparison with valuations provided by the respective counterparties. The fair value for mortgage derivatives is based on changes in mortgage rates from the date of the commitments. The fair value of foreign currency derivatives is computed based on change in foreign currency rates stated in the contract compared to those prevailing at the measurement date. In conjunction with the FASB’s fair value measurement guidance, the Company made an accounting policy election in the first quarter of 2012 to measure the credit risk of its derivative financial instruments that are subject to master netting agreements on a net basis by counterparty portfolio.
	Nonqualified deferred compensation assets—The underlying assets relating to the nonqualified deferred compensation plan are included in a trust and primarily consist of non-exchange traded institutional funds which are priced based by an independent third party service.
	The following tables present the balances of assets and liabilities measured at fair value on a recurring basis for the periods presented:
			31-Dec-13
	(Dollars in thousands)		Total			Level 1			Level 2			Level 3
	Available-for-sale securities
	U.S. Treasury		$	336,095		$	—		$	336,095		$	—
	U.S. Government agencies		895,688			—			895,688			—
	Municipal		152,716			—			116,330			36,386
	Corporate notes		135,038			—			135,038			—
	Mortgage-backed		605,225			—			605,225			—
	Equity securities		51,528			—			29,365			22,163
	Trading account securities		497			—			497			—
	Mortgage loans held-for-sale		332,485			—			332,485			—
	Mortgage servicing rights		8,946			—			—			8,946
	Nonqualified deferred compensations assets		7,222			—			7,222			—
	Derivative assets		48,221			—			48,221			—
	Total		$	2,573,661		$	—		$	2,506,166		$	67,495
	Derivative liabilities		$	37,264		$	—		$	37,264		$	—
			31-Dec-12
	(Dollars in thousands)		Total			Level 1			Level 2			Level 3
	Available-for-sale securities
	U.S. Treasury		$	219,487		$	—		$	219,487		$	—
	U.S. Government agencies		990,039			—			990,039			—
	Municipal		110,471			—			79,701			30,770
	Corporate notes		154,806			—			154,806			—
	Mortgage-backed		271,574			—			271,574			—
	Equity securities		49,699			—			27,530			22,169
	Trading account securities		583			—			583			—
	Mortgage loans held-for-sale		385,033			—			385,033			—
	Mortgage servicing rights		6,750			—			—			6,750
	Nonqualified deferred compensations assets		5,532			—			5,532			—
	Derivative assets		53,906			—			53,906			—
	Total		$	2,247,880		$	—		$	2,188,191		$	59,689
	Derivative liabilities		$	57,751		$	—		$	57,751		$	—
	The aggregate remaining contractual principal balance outstanding as of December 31, 2013 and 2012 for mortgage loans held- for-sale measured at fair value under ASC 825 was $314.9 million and $379.5 million, respectively, while the aggregate fair value of mortgage loans held-for-sale was $332.5 million and $385.0 million, respectively, as shown in the above tables. There were no nonaccrual loans or loans past due greater than 90 days and still accruing in the mortgage loans held-for-sale portfolio measured at fair value as of December 31, 2013 and 2012.
	The changes in Level 3 assets measured at fair value on a recurring basis during the year ended December 31, 2013 are summarized as follows:
					Equity securities			Mortgage
	(Dollars in thousands)	Municipal						servicing rights
	Balance at January 1, 2013	$	30,770		$	22,169		$	6,750
	Total net (losses) gains included in:
	Net income (1)	—			(3,328		)	2,196
	Other comprehensive (loss) income	(296		)	3,322			—
	Purchases	22,209			—			—
	Issuances	—			—			—
	Sales	—			—			—
	Settlements	(16,297		)	—			—
	Net transfers into/out of Level 3	—			—			—
	Balance at December 31, 2013	$	36,386		$	22,163		$	8,946
	-1	Changes in the balance of mortgage servicing rights are recorded as a component of mortgage banking revenue in non-interest income.
	The changes in Level 3 assets measured at fair value on a recurring basis during the year ended December 31, 2012 are summarized as follows:
(Dollars in thousands)	Municipal			Equity securities			Mortgage servicing rights
Balance at January 1, 2012	$	24,211		$	18,971		$	6,700
Total net gains included in:
Net income (1)	—			—			50
Other comprehensive income	27			3,198			—
Purchases	20,967			—			—
Issuances	—			—			—
Sales	—			—			—
Settlements	(12,033		)	—			—
Net transfers out of Level 3 (2)	(2,402		)	—			—
Balance at December 31, 2012	$	30,770		$	22,169		$	6,750
-1	Changes in the balance of mortgage servicing rights are recorded as a component of mortgage banking revenue in non-interest income.
-2	During the first quarter of 2012, one municipal security was transferred out of Level 3 into Level 2 as observable market information was available that market participants would use in pricing these securities. Transfers out of Level 3 are recognized at the end of the reporting period.
Also, the Company may be required, from time to time, to measure certain other financial assets at fair value on a nonrecurring basis in accordance with GAAP. These adjustments to fair value usually result from application of lower of cost or market accounting or impairment charges of individual assets. For assets measured at fair value on a nonrecurring basis that were still held in the balance sheet at the end of the period, the following table provides the carrying value of the related individual assets or portfolios at December 31, 2013.
		December 31, 2013											Twelve Months
													Ended
													December 31,
													2013
													Fair Value
													Losses
(Dollars in thousands)		Total			Level 1			Level 2			Level 3		Recognized
Impaired loans-collateral based		$	55,127		$	—		$	—		$	55,127	$	38,430
Other real estate owned, including covered other real estate owned (1)		136,288			—			—			136,288		10,924
Mortgage loans held-for-sale, at lower of cost or market		1,842			—			1,842			—		—
Total		$	193,257		$	—		$	1,842		$	191,415	$	49,354
-1	Fair value losses recognized on other real estate owned include valuation adjustments and charge-offs during the respective period.
Impaired loans—A loan is considered to be impaired when, based on current information and events, it is probable that the Company will be unable to collect all amounts due pursuant to the contractual terms of the loan agreement. A loan restructured in a troubled debt restructuring is an impaired loan according to applicable accounting guidance. Impairment is measured by estimating the fair value of the loan based on the present value of expected cash flows, the market price of the loan, or the fair value of the underlying collateral. Impaired loans are considered a fair value measurement where an allowance is established based on the fair value of collateral. Appraised values, which may require adjustments to market-based valuation inputs, are generally used on real estate collateral-dependent impaired loans.
The Company’s Managed Assets Division is primarily responsible for the valuation of Level 3 measurements of impaired loans. For more information on the Managed Assets Division review of impaired loans refer to Note 5 – Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans. At December 31, 2013, the Company had $162.2 million of impaired loans classified as Level 3. Of the $162.2 million of impaired loans, $55.1 million were measured at fair value based on the underlying collateral of the loan as shown in the table above. The remaining $107.1 million were valued based on discounted cash flows in accordance with ASC 310.
Other real estate owned (including covered other real estate owned)—Other real estate owned is comprised of real estate acquired in partial or full satisfaction of loans and is included in other assets. Other real estate owned is recorded at its estimated fair value less estimated selling costs at the date of transfer, with any excess of the related loan balance over the fair value less expected selling costs charged to the allowance for loan losses. Subsequent changes in value are reported as adjustments to the carrying amount and are recorded in other non-interest expense. Gains and losses upon sale, if any, are also charged to other non-interest expense. Fair value is generally based on third party appraisals and internal estimates and is therefore considered a Level 3 valuation.
The Company’s Managed Assets Division and Purchased Assets Divisions are primarily responsible for the valuation of Level 3 measurements for non-covered other real estate owned and covered other real estate owned, respectively. At December 31, 2013, the Company had $136.3 million of other real estate owned classified as Level 3. The unobservable input applied to other real estate owned relates to the valuation adjustment determined by the Company’s appraisals. The impairment adjustments applied to other real estate owned range from 0%-100% of the carrying value prior to impairment adjustments at December 31, 2013, with a weighted average input of 2.94%. An increased impairment adjustment applied to the carrying value results in a decreased valuation.
Mortgage loans held-for-sale, at lower of cost or market—Fair value is based on either quoted prices for the same or similar loans, or values obtained from third parties, or is estimated for portfolios of loans with similar financial characteristics and is therefore considered a Level 2 valuation.
The valuation techniques and significant unobservable inputs used to measure both recurring and non-recurring Level 3 fair value measurements at December 31, 2013 were as follows:
(Dollars in thousands)
	Fair Value			Valuation Methodology		Significant Unobservable Input	Range		Weighted	Impact to valuation
							of Inputs		Average	from an increased or
									of Inputs	higher input value
Measured at fair value on a recurring basis:
Municipal Securities	$	36,386		Bond pricing		Equivalent rating	BBB-AA+		N/A	Increase
Other Equity Securities	22,163			Discounted cash flows		Discount rate	1.94%-3.06%		2.54%	Decrease
Mortgage Servicing Rights	8,946			Discounted cash flows		Discount rate	10%-13.5%		10.16%	Decrease
						Constant prepayment rate (CPR)	10%-15%		11.94%	Decrease
Measured at fair value on a non-recurring basis:
Impaired loans—collateral based	55,127			Appraisal value		N/A	N/A		N/A	N/A
Other real estate owned	136,288			Appraisal value		Property specific impairment adjustment	0%-100%		2.94%	Decrease
The Company is required under applicable accounting guidance to report the fair value of all financial instruments on the consolidated statements of condition, including those financial instruments carried at cost. The carrying amounts and estimated fair values of the Company’s financial instruments as of the dates shown:
		31-Dec-13						31-Dec-12
(Dollars in thousands)		Carrying			Fair			Carrying			Fair
		Value			Value			Value			Value
Financial Assets:
Cash and cash equivalents		$	263,864		$	263,864		$	315,028		$	315,028
Interest bearing deposits with banks		495,574			495,574			1,035,743			1,035,743
Available-for-sale securities		2,176,290			2,176,290			1,796,076			1,796,076
Trading account securities		497			497			583			583
Brokerage customer receivables		30,953			30,953			24,864			24,864
Federal Home Loan Bank and Federal Reserve Bank stock, at cost		79,261			79,261			79,564			79,564
Mortgage loans held-for-sale, at fair value		332,485			332,485			385,033			385,033
Mortgage loans held-for-sale, at lower of cost or market		1,842			1,857			27,167			27,568
Total loans		13,243,033			13,867,255			12,389,030			13,053,101
Mortgage servicing rights		8,946			8,946			6,750			6,750
Nonqualified deferred compensation assets		7,222			7,222			5,532			5,532
Derivative assets		48,221			48,221			53,906			53,906
FDIC indemnification asset		85,672			85,672			208,160			208,160
Accrued interest receivable and other		163,732			163,732			157,157			157,157
Total financial assets		$	16,937,592		$	17,561,829		$	16,484,593		$	17,149,065
Financial Liabilities
Non-maturity deposits		$	10,442,077		$	10,442,077		$	9,447,633		$	9,447,633
Deposits with stated maturities		4,226,712			4,242,172			4,980,911			5,013,757
Notes payable		364			364			2,093			2,093
Federal Home Loan Bank advances		417,762			422,750			414,122			425,431
Subordinated notes		—			—			15,000			15,000
Other borrowings		254,740			254,740			274,411			274,411
Junior subordinated debentures		249,493			250,672			249,493			250,428
Derivative liabilities		37,264			37,264			57,751			57,751
Accrued interest payable and other		8,556			8,556			11,589			11,589
Total financial liabilities		$	15,636,968		$	15,658,595		$	15,453,003		$	15,498,093
Not all the financial instruments listed in the table above are subject to the disclosure provisions of ASC Topic 820, as certain assets and liabilities result in their carrying value approximating fair value. These include cash and cash equivalents, interest bearing deposits with banks, brokerage customer receivables, FHLB and FRB stock, FDIC indemnification asset, accrued interest receivable and accrued interest payable, non-maturity deposits, notes payable, subordinated notes and other borrowings.
The following methods and assumptions were used by the Company in estimating fair values of financial instruments that were not previously disclosed.
Loans. Fair values are estimated for portfolios of loans with similar financial characteristics. Loans are analyzed by type such as commercial, residential real estate, etc. Each category is further segmented by interest rate type (fixed and variable) and term. For variable-rate loans that reprice frequently, estimated fair values are based on carrying values. The fair value of residential loans is based on secondary market sources for securities backed by similar loans, adjusted for differences in loan characteristics. The fair value for other fixed rate loans is estimated by discounting scheduled cash flows through the estimated maturity using estimated market discount rates that reflect credit and interest rate risks inherent in the loan. The primary impact of credit risk on the present value of the loan portfolio, however, was accommodated through the use of the allowance for loan losses, which is believed to represent the current fair value of probable incurred losses for purposes of the fair value calculation. In accordance with ASC 820, the Company has categorized loans as a Level 3 fair value measurement.
Deposits with stated maturities. The fair value of certificates of deposit is based on the discounted value of contractual cash flows. The discount rate is estimated using the rates currently in effect for deposits of similar remaining maturities. In accordance with ASC 820, the Company has categorized deposits with stated maturities as a Level 3 fair value measurement.
Federal Home Loan Bank advances. The fair value of Federal Home Loan Bank advances is obtained from the Federal Home Loan Bank which uses a discounted cash flow analysis based on current market rates of similar maturity debt securities to discount cash flows. In accordance with ASC 820, the Company has categorized Federal Home Loan Bank advances as a Level 3 fair value measurement.
Junior subordinated debentures. The fair value of the junior subordinated debentures is based on the discounted value of contractual cash flows. In accordance with ASC 820, the Company has categorized junior subordinated debentures as a Level 3 fair value measurement.

Shareholders_Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2013
Stockholders' Equity Note [Abstract]	'
Shareholders' Equity	'
	Shareholders’ Equity
	A summary of the Company’s common and preferred stock at December 31, 2013 and 2012 is as follows:
			2013			2012
	Common Stock:
	Shares authorized		100,000,000			100,000,000
	Shares issued		46,181,588			37,107,684
	Shares outstanding		46,116,583			36,858,355
	Cash dividend per share		$	0.18		$	0.18
	Preferred Stock:
	Shares authorized		20,000,000			20,000,000
	Shares issued		126,477			176,500
	Shares outstanding		126,477			176,500
	The Company reserves shares of its authorized common stock specifically for its Stock Incentive Plan, its Employee Stock Purchase Plan and its Directors Deferred Fee and Stock Plan. The reserved shares and these plans are detailed in Note 19 -Employee Benefit and Stock Plans. The Company also reserves its authorized common stock for conversion of convertible preferred stock and common stock warrants.
	Tangible Equity Units
	In December 2010, the Company sold 4.6 million 7.50% TEU's at a public offering price of $50.00 per unit. The Company received net proceeds of $222.7 million after deducting underwriting discounts and commissions and estimated offering expenses. Each tangible equity unit was composed of a prepaid common stock purchase contract and a junior subordinated amortizing note due December 15, 2013. The prepaid stock purchase contracts were recorded as surplus (a component of shareholders’ equity), net of issuance costs, and the junior subordinated amortizing notes were recorded as debt within other borrowings. Issuance costs associated with the debt component were recorded as a discount within other borrowings and were amortized over the term of the instrument to December 15, 2013 at which time they were paid off. The Company allocated the proceeds from the issuance of the TEU to equity and debt based on the relative fair values of the respective components of each unit.
	The aggregate fair values assigned to each component of the TEU offering were as follows:
	(Dollars and units in thousands, except unit price)		Equity			Debt			TEU
			Component			Component			Total
	Units issued (1)		4,600			4,600			4,600
	Unit price		$	40.271818		$	9.728182		$	50
	Gross proceeds		185,250			44,750			230,000
	Issuance costs, including discount		5,934			1,419			7,353
	Net proceeds		$	179,316		$	43,331		$	222,647
	Balance sheet impact
	Other borrowings		—			43,331			43,331
	Surplus		179,316			—			179,316
	-1	TEUs consisted of two components: one unit of the equity component and one unit of the debt component.
	The fair value of the debt component was determined using a discounted cash flow model using the following assumptions: (1) quarterly cash payments of 7.5%; (2) a maturity date of December 15, 2013; and (3) an assumed discount rate of 9.5%. The discount rate used for estimating the fair value was determined by obtaining yields for comparably-rated issuers trading in the market. The debt component was recorded at fair value, and the discount was amortized using the level yield method over the term of the instrument to the settlement date of December 15, 2013.
	The fair value of the equity component was determined using Black-Scholes valuation models applied to the range of stock prices contemplated by the terms of the TEU and using the following assumptions: (1) risk-free interest rate of 0.95%; (2) expected stock price volatility in the range of 35%-45%; (3) dividend yield plus stock borrow cost of 0.85%; and (4) term of 3.02 years.
	Each junior subordinated amortizing note, which had an initial principal amount of $9.728182, had a stated interest rate of 9.50% per annum, and had a scheduled final installment payment date of December 15, 2013. On each March 15, June 15, September 15 and December 15, the Company paid equal quarterly installments of $0.9375 on each amortizing note. The quarterly installment payable at March 15, 2011, however, was $0.989583. Each payment constituted a payment of interest and a partial repayment of principal. The issuance costs were amortized to interest expense using the effective-interest method.
	Each prepaid common stock purchase contract automatically settled on December 15, 2013 and the Company delivered 1.3333 shares of its common stock based on the applicable market value at that time (the average of the volume weighted average price of Company common stock for the twenty (20) consecutive trading days ending on the third trading day immediately preceding December 15, 2013). Upon settlement, an amount equal to $1.00 per common share issued was reclassified from surplus to common stock.
	Series A Preferred Stock
	In August 2008, the Company issued and sold 50,000 shares of non-cumulative perpetual convertible preferred stock, Series A, liquidation preference $1,000 per share for $50 million in a private transaction. Dividends on the Series A Preferred Stock were payable quarterly in arrears at a rate of 8.00% per annum. The Series A Preferred Stock was convertible into common stock at the option of the holder at a conversion rate of 38.88 shares of common stock per share of Series A Preferred Stock. On July 19, 2013, pursuant to such terms, the holder of the Series A Preferred Stock elected to convert all 50,000 shares of Series A Preferred Stock into 1,944,000 shares of the Company's common stock, no par value.
	Series C Preferred Stock
	In March 2012, the Company issued and sold 126,500 shares of non−cumulative perpetual convertible preferred stock, Series C, liquidation preference $1,000 per share for $126.5 million in an equity offering. If declared, dividends on the Series C Preferred Stock are payable quarterly in arrears at a rate of 5.00% per annum. The Series C Preferred Stock is convertible into common stock at the option of the holder at a conversion rate of 24.3132 shares of common stock per share of Series C Preferred Stock. In 2013, pursuant to such terms, certain holders of the Series C Preferred Stock elected to convert 23 shares of Series C Preferred Stock into 559 shares of the Company's common stock, no par value. On and after April 15, 2017, the Company will have the right under certain circumstances to cause the Series C Preferred Stock to be converted into common stock if the closing price of the Company’s common stock exceeds a certain amount.
	Common Stock Warrants
	Pursuant to the U.S. Department of the Treasury’s Capital Purchase Program, on December 19, 2008, the Company issued to the U.S. Treasury, a warrant to purchase 1,643,295 shares of Wintrust common stock at a per share exercise price of $22.82 and with a term of 10 years. In February 2011, the U.S. Treasury sold all of its interest in the warrant issued to it in a secondary underwritten public offering. At December 31, 2013, the warrant to purchase 1,643,295 shares remained outstanding.
	The Company previously issued other warrants to acquire common stock. These warrants entitle the holders to purchase one share of the Company’s common stock at a purchase price of $30.50 per share. Of the 19,000 warrants previously outstanding, 18,000 were exercised in March 2012 and 1,000 were exercised in February 2013. As a result, none of these warrants were outstanding at December 31, 2013 and 1,000 were outstanding at December 31, 2012.
	Other
	In May 2013, the Company issued 648,286 shares of its common stock in the acquisition of FNBI. In December 2012, the Company issued 372,530 shares of its common stock in the acquisition of HPK. In August 2012, the Company issued 25,493 shares of its common stock in settlement of contingent consideration related to the previously completed acquisition of Great Lakes Advisors, which is in addition to the 529,087 shares issued in July 2011 at the time of the acquisition. In September 2011, the Company issued 353,650 shares of its common stock in the acquisition of ESBI.
	At the January 2014 Board of Directors meeting, a quarterly cash dividend of $0.10 per share ($0.40 on an annualized basis) was declared. It was paid on February 20, 2014 to shareholders of record as of February 6, 2014.
	The following tables summarize the components of other comprehensive income (loss), including the related income tax effects, for the years ending December 31, 2013, 2012 and 2011:
	(In thousands)		Accumulated			Accumulated			Accumulated			Total
			Unrealized			Unrealized			Foreign			Accumulated
			Gains			(Losses) Gains on			Currency			Other
			(Losses) on			Derivative			Translation			Comprehensive
			Securities			Instruments			Adjustments			Income (Loss)
	Balance at January 1, 2013		$	6,710		$	(5,292	)	$	6,293		$	7,711
	Other comprehensive loss during the period, net of tax, before reclassification		(62,182		)	(251		)	(13,202		)	(75,635		)
	Amount reclassified from accumulated other comprehensive income, net of tax		$	1,807		$	3,081		$	—		$	4,888
	Net other comprehensive (loss) income during the period, net of tax		$	(60,375	)	$	2,830		$	(13,202	)	$	(70,747	)
	Balance at December 31, 2013		$	(53,665	)	$	(2,462	)	$	(6,909	)	$	(63,036	)
	Balance at January 1, 2012		$	4,204		$	(7,082	)	$	—		$	(2,878	)
	Other comprehensive income (loss) during the period, net of tax, before reclassification		5,461			(1,713		)	6,293			10,041
	Amount reclassified from accumulated other comprehensive (loss) income, net of tax		(2,955		)	3,503			—			548
	Net other comprehensive income during the period, net of tax		$	2,506		$	1,790		$	6,293		$	10,589
	Balance at December 31, 2012		$	6,710		$	(5,292	)	$	6,293		$	7,711
	Balance at January 1, 2011		$	2,679		$	(8,191	)	$	—		$	(5,512	)
	Other comprehensive income (loss) during the period, net of tax, before reclassifications		2,605			(3,818		)	—			(1,213		)
	Amount reclassified from accumulated other comprehensive (loss) income, net of tax		(1,080		)	4,927			—			3,847
	Net other comprehensive income during the period, net of tax		$	1,525		$	1,109		$	—		$	2,634
	Balance at December 31, 2011		$	4,204		$	(7,082	)	$	—		$	(2,878	)
			Amount Reclassified from Accumulated Other Comprehensive Income for the Year Ended,
Details Regarding the Component of Accumulated Other Comprehensive Income		December 31,						Impacted Line on the Consolidated Statements of Income
		2013			2012
Accumulated unrealized gains (losses) on securities
(Losses) gains included in net income		$	(3,000	)	$	4,895		(Losses) gains on available-for-sale securities, net
		(3,000		)	4,895			Income before taxes
Tax effect		$	1,193		$	(1,940	)	Income tax expense
Net of tax		$	(1,807	)	$	2,955		Net income
Accumulated unrealized (losses) gains on derivative instruments
Amount reclassified to interest expense on junior subordinated debentures		$	5,116		$	5,850		Interest on junior subordinated debentures
		(5,116		)	(5,850		)	Income before taxes
Tax effect		$	2,035		$	2,347		Income tax expense
Net of tax		$	(3,081	)	$	(3,503	)	Net income

Segment_Information

Segment Information	12 Months Ended
	Dec. 31, 2013
Segment Reporting [Abstract]	'
Segment Information	'
	Segment Information
	The Company’s operations consist of three primary segments: community banking, specialty finance and wealth management.
	The three reportable segments are strategic business units that are separately managed as they offer different products and services and have different marketing strategies. In addition, each segment’s customer base has varying characteristics and each segment has a different regulatory environment. While the Company’s management monitors each of the fifteen bank subsidiaries’ operations and profitability separately, these subsidiaries have been aggregated into one reportable operating segment due to the similarities in products and services, customer base, operations, profitability measures and economic characteristics.
	As of December 31, 2013, management made changes in its approach to measure segment profitability. For purposes of internal segment profitability, management allocates certain intersegment and parent company balances. Management allocates a portion of revenues to the specialty finance segment related to loans originated by the specialty finance segment and sold to the community banking segment. Similarly, for purposes of analyzing the contribution from the wealth management segment, management allocates a portion of the net interest income earned by the community banking segment on deposit balances of customers of the wealth management segment to the wealth management segment. See Note 11 — Deposits, for more information on these deposits. Finally, expenses incurred at the Wintrust parent company are allocated to each segment based on each segment's risk-weighted assets.
	The segment financial information provided in the following tables has been derived from the internal profitability reporting system used by management to monitor and manage the financial performance of the Company. The accounting policies of the segments are generally the same as those described in the Summary of Significant Accounting Policies in Note 1. The Company evaluates segment performance based on after-tax profit or loss and other appropriate profitability measures common to each segment.
	The following is a summary of certain operating information for reportable segments:
	(Dollars in thousands)	Community		Specialty		Wealth	Total Operating Segments	Intersegment Eliminations		Consolidated
		Banking		Finance		Management
	2013
	Net interest income	$	448,173	73,903		14,118	536,194	14,433		550,627
	Provision for credit losses	45,396		637		—	46,033	—		46,033
	Non-interest income	150,543		30,890		65,597	247,030	(24,633	)	222,397
	Non-interest expense	409,780		40,529		62,442	512,751	(10,200	)	502,551
	Income tax expense	55,161		25,508		6,561	87,230	—		87,230
	Net income	$	88,379	38,119		10,712	137,210	—		137,210
	Total assets at end of year	$	15,132,912	2,470,832		494,039	18,097,783	—		18,097,783
	2012						—	—		—
	Net interest income	$	430,405	64,048		12,324	506,777	12,739		519,516
	Provision for credit losses	74,975		1,461		—	76,436	—		76,436
	Non-interest income	166,296		26,845		54,519	247,660	(21,568	)	226,092
	Non-interest expense	403,228		38,394		56,247	497,869	(8,829	)	489,040
	Income tax expense	45,170		19,660		4,106	68,936	—		68,936
	Net income	$	73,328	31,378		6,490	111,196	—		111,196
	Total assets at end of year	$	14,787,221	2,295,284		437,108	17,519,613	—		17,519,613
	2011						—			—
	Net interest income	$	370,733	72,893		11,228	454,854	6,523		461,377
	Provision for credit losses	102,902		(264	)	—	102,638	—		102,638
	Non-interest income	139,248		15,133		47,755	202,136	(12,438	)	189,698
	Non-interest expense	342,283		32,829		51,207	426,319	(5,915	)	420,404
	Income tax expense	24,681		22,511		3,266	50,458	—		50,458
	Net income	$	40,115	32,950		4,510	77,575	—		77,575
	Total assets at end of year	$	13,286,432	2,185,214		422,162	15,893,808	—		15,893,808

Condensed_Parent_Company_Finan

Condensed Parent Company Financial Statements	12 Months Ended
	Dec. 31, 2013
Condensed Financial Information of Parent Company Only Disclosure [Abstract]	'
Condensed Parent Company Financial Statements	'
	Condensed Parent Company Financial Statements
	Condensed parent company only financial statements of Wintrust follow:
	Statement of Financial Condition
		December 31,
	(In thousands)	2013			2012
	Assets
	Cash	$	80,869		$	55,011
	Available-for-sale securities, at fair value	12,839			9,647
	Investment in and receivable from subsidiaries	1,971,018			1,935,556
	Loans, net of unearned income	3,768			1,760
	Less: Allowance for loan losses	81			—
	Net Loans	3,687			1,760
	Goodwill	8,371			8,347
	Other assets	113,930			111,786
	Total assets	$	2,190,714		$	2,122,107
	Liabilities and Shareholders’ Equity
	Other liabilities	$	21,292		$	15,899
	Notes payable	—			1,000
	Subordinated notes	—			15,000
	Other borrowings	19,340			36,010
	Junior subordinated debentures	249,493			249,493
	Shareholders’ equity	1,900,589			1,804,705
	Total liabilities and shareholders’ equity	$	2,190,714		$	2,122,107
	Statements of Income
		Years Ended December 31,
	(In thousands)	2013			2012			2011
	Income
	Dividends and interest from subsidiaries	$	114,241		$	47,295		$	30,783
	Gains on available-for-sale securities, net	111			64			164
	Other income	4,529			605			(487		)
	Total income	118,881			47,964			30,460
	Expenses
	Interest expense	13,424			16,840			21,342
	Salaries and employee benefits	17,831			20,042			12,435
	Other expenses	24,739			27,428			14,037
	Total expenses	55,994			64,310			47,814
	Income (loss) before income taxes and equity in undistributed loss of subsidiaries	62,887			(16,346		)	(17,354		)
	Income tax benefit	18,599			23,127			16,573
	Income (loss) before equity in undistributed net income of subsidiaries	81,486			6,781			(781		)
	Equity in undistributed net income of subsidiaries	55,724			104,415			78,356
	Net income	$	137,210		$	111,196		$	77,575
	Statements of Cash Flows
		Years Ended December 31,
	(In thousands)	2013			2012			2011
	Operating Activities:
	Net income	$	137,210		$	111,196		$	77,575
	Adjustments to reconcile net income to net cash provided by (used for) operating activities
	Provision for credit losses	1,765			8,050			608
	Gains on available-for-sale securities, net	(111		)	(64		)	(164		)
	Depreciation and amortization	3,744			3,072			2,178
	Deferred income tax expense (benefit)	1,217			2,224			(1,785		)
	Stock-based compensation expense	6,799			9,072			2,008
	Tax (expense) benefit from stock-based compensation arrangements	(831		)	1,392			129
	Excess tax benefits from stock-based compensation arrangements	(112		)	(483		)	(19		)
	Increase in other assets	(3,051		)	(53,892		)	(28,389		)
	(Decrease) increase in other liabilities	(4,517		)	(1,619		)	122
	Equity in undistributed net income of subsidiaries	(55,724		)	(104,415		)	(78,356		)
	Net Cash Provided by (Used for) Operating Activities	86,389			(25,467		)	(26,093		)
	Investing Activities:
	Capital contributions to subsidiaries, net	(8,293		)	(53,807		)	(22,361		)
	Other investing activity, net	(21,206		)	(12,284		)	440
	Net Cash Used for Investing Activities	(29,499		)	(66,091		)	(21,921		)
	Financing Activities:
(Decrease) increase in notes payable and other borrowings, net	(17,860		)	(44,887		)	36,337
Repayment of subordinated note	(15,000		)	(20,000		)	(15,000		)
Excess tax benefits from stock-based compensation arrangements	112			483			19
Net proceeds from issuance of Series C preferred stock	—			122,690			—
Issuance of common shares resulting from exercise of stock options, employee stock purchase plan and conversion of common stock warrants	19,113			14,891			3,586
Dividends paid	(13,893		)	(13,157		)	(10,344		)
Common stock repurchases	(3,504		)	(7,726		)	(112		)
Net Cash (Used For) Provided by Financing Activities	(31,032		)	52,294			14,486
Net Increase (Decrease) in Cash and Cash Equivalents	25,858			(39,264		)	(33,528		)
Cash and Cash Equivalents at Beginning of Year	55,011			94,275			127,803
Cash and Cash Equivalents at End of Year	$	80,869		$	55,011		$	94,275
Statements of Cash Flows
	Years Ended December 31,
(In thousands)	2013			2012			2011
Operating Activities:
Net income	$	137,210		$	111,196		$	77,575
Adjustments to reconcile net income to net cash provided by (used for) operating activities
Provision for credit losses	1,765			8,050			608
Gains on available-for-sale securities, net	(111		)	(64		)	(164		)
Depreciation and amortization	3,744			3,072			2,178
Deferred income tax expense (benefit)	1,217			2,224			(1,785		)
Stock-based compensation expense	6,799			9,072			2,008
Tax (expense) benefit from stock-based compensation arrangements	(831		)	1,392			129
Excess tax benefits from stock-based compensation arrangements	(112		)	(483		)	(19		)
Increase in other assets	(3,051		)	(53,892		)	(28,389		)
(Decrease) increase in other liabilities	(4,517		)	(1,619		)	122
Equity in undistributed net income of subsidiaries	(55,724		)	(104,415		)	(78,356		)
Net Cash Provided by (Used for) Operating Activities	86,389			(25,467		)	(26,093		)
Investing Activities:
Capital contributions to subsidiaries, net	(8,293		)	(53,807		)	(22,361		)
Other investing activity, net	(21,206		)	(12,284		)	440
Net Cash Used for Investing Activities	(29,499		)	(66,091		)	(21,921		)
Financing Activities:
(Decrease) increase in notes payable and other borrowings, net	(17,860		)	(44,887		)	36,337
Repayment of subordinated note	(15,000		)	(20,000		)	(15,000		)
Excess tax benefits from stock-based compensation arrangements	112			483			19
Net proceeds from issuance of Series C preferred stock	—			122,690			—
Issuance of common shares resulting from exercise of stock options, employee stock purchase plan and conversion of common stock warrants	19,113			14,891			3,586
Dividends paid	(13,893		)	(13,157		)	(10,344		)
Common stock repurchases	(3,504		)	(7,726		)	(112		)
Net Cash (Used For) Provided by Financing Activities	(31,032		)	52,294			14,486
Net Increase (Decrease) in Cash and Cash Equivalents	25,858			(39,264		)	(33,528		)
Cash and Cash Equivalents at Beginning of Year	55,011			94,275			127,803
Cash and Cash Equivalents at End of Year	$	80,869		$	55,011		$	94,275

Earnings_Per_Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2013
Earnings Per Share [Abstract]	'
Earnings Per Share	'
	Earnings Per Share
	The following table sets forth the computation of basic and diluted earnings per common share for 2013 , 2012 and 2011:
	(In thousands, except per share data)		2013		2012		2011
	Net income		$	137,210	$	111,196	$	77,575
	Less: Preferred stock dividends and discount accretion		8,395		9,093		4,128
	Net income applicable to common shares—Basic	(A)	128,815		102,103		73,447
	Add: Dividends on convertible preferred stock		8,325		8,955		—
	Net income applicable to common shares—Diluted	(B)	137,140		111,058		73,447
	Weighted average common shares outstanding	(C)	38,699		36,365		35,355
	Effect of dilutive potential common shares:
	Common stock equivalents		7,108		7,313		8,636
	Convertible preferred stock, if dilutive		4,141		4,356		—
	Total dilutive potential common shares		11,249		11,669		8,636
	Weighted average common shares and effect of dilutive potential common shares	(D)	49,948		48,034		43,991
	Net income per common share:
	Basic	(A/C)	$	3.33	$	2.81	$	2.08
	Diluted	(B/D)	$	2.75	$	2.31	$	1.67
	Potentially dilutive common shares can result from stock options, restricted stock unit awards, stock warrants, the Company’s convertible preferred stock, tangible equity unit shares and shares to be issued under the ESPP and the DDFS Plan, being treated as if they had been either exercised or issued, computed by application of the treasury stock method. While potentially dilutive common shares are typically included in the computation of diluted earnings per share, potentially dilutive common shares are excluded from this computation in periods in which the effect would reduce the loss per share or increase the income per share. For diluted earnings per share, net income applicable to common shares can be affected by the conversion of the Company’s convertible preferred stock. Where the effect of this conversion would reduce the loss per share or increase the income per share, net income applicable to common shares is not adjusted by the associated preferred dividends.

Quarterly_Financial_Summary_Un

Quarterly Financial Summary (Unaudited)	12 Months Ended
	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]	'
Quarterly Financial Summary (Unaudited)	'
	Quarterly Financial Summary (Unaudited)
	The following is a summary of quarterly financial information for the years ended December 31, 2013 and 2012:
		2013 Quarters						2012 Quarters
	(In thousands, except per share data)	First		Second	Third	Fourth		First		Second	Third	Fourth
	Interest income	$	152,313	156,646	161,168	160,582		$	156,486	155,691	158,201	156,643
	Interest expense	21,600		20,822	19,386	18,274		30,591		27,421	25,626	23,867
	Net interest income	130,713		135,824	141,782	142,308		125,895		128,270	132,575	132,776
	Provision for credit losses	15,687		15,382	11,114	3,850		17,400		20,691	18,799	19,546
	Net interest income after provision for credit losses	115,026		120,442	130,668	138,458		108,495		107,579	113,776	113,230
	Non-interest income, excluding net securities gains (losses)	57,128		63,993	54,587	49,689		46,207		49,826	62,536	62,628
	Net securities gains (losses)	251		2	75	(3,328	)	816		1,109	409	2,561
	Non-interest expense	120,119		128,187	127,248	126,997		117,759		117,185	124,548	129,548
	Income before income taxes	52,286		56,250	58,082	57,822		37,759		41,329	52,173	48,871
	Income tax expense	20,234		21,943	22,519	22,534		14,549		15,734	19,871	18,782
	Net income	$	32,052	34,307	35,563	35,288		$	23,210	25,595	32,302	30,089
	Preferred stock dividends and discount accretion	2,616		2,617	1,581	1,581		1,246		2,644	2,616	2,616
	Net income applicable to common shares	$	29,436	31,690	33,982	33,707		$	21,964	22,951	29,686	27,473
	Net income per common share:
	Basic	0.8		0.85	0.86	0.82		0.61		0.63	0.82	0.75
	Diluted	0.65		0.69	0.71	0.7		0.5		0.52	0.66	0.61
	Cash dividends declared per common share	0.09		—	0.09	—		0.09		—	0.09	—

Summary_Of_Significant_Account1

Summary Of Significant Accounting Policies (Policy)	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Principles of Consolidation	'
	Principles of Consolidation
	The consolidated financial statements of Wintrust include the accounts of the Company and its subsidiaries. All significant intercompany accounts and transactions have been eliminated in the consolidated financial statements.
	This securitization transaction was accounted for as a secured borrowing and the securitization entity is treated as a consolidated subsidiary of the Company under ASC 810, “Consolidation”. The securitization entity’s receivables underlying third-party investors’ interests were recorded in loans, net of unearned income, excluding covered loans, an allowance for loan losses was established and the related debt issued was reported in secured borrowings—owed to securitization investors. Additionally, the Company’s retained interests in the transaction, principally consisting of subordinated securities, cash collateral, and overcollateralization of loans, constituted intercompany positions, which were eliminated in the preparation of the Company’s Consolidated Statements of Condition.
Earnings per Share	'
	Earnings per Share
	Basic earnings per share is computed by dividing income available to common shareholders by the weighted-average number of common shares outstanding for the period. Diluted earnings per share reflects the potential dilution that would occur if securities or other contracts to issue common stock were exercised or converted into common stock or resulted in the issuance of common stock that then shared in the earnings of the Company. The weighted-average number of common shares outstanding is increased by the assumed conversion of outstanding convertible preferred stock and tangible equity unit shares from the beginning of the year or date of issuance, if later, and the number of common shares that would be issued assuming the exercise of stock options, the issuance of restricted shares and stock warrants using the treasury stock method. The adjustments to the weighted-average common shares outstanding are only made when such adjustments will dilute earnings per common share. Net income applicable to common shares used in the diluted earnings per share calculation can be affected by the conversion of the Company's preferred stock. Where the effect of this conversion would reduce the loss per share or increase the income per share, net income applicable to common shares is not adjusted by the associated preferred dividends.
	Potentially dilutive common shares can result from stock options, restricted stock unit awards, stock warrants, the Company’s convertible preferred stock, tangible equity unit shares and shares to be issued under the ESPP and the DDFS Plan, being treated as if they had been either exercised or issued, computed by application of the treasury stock method. While potentially dilutive common shares are typically included in the computation of diluted earnings per share, potentially dilutive common shares are excluded from this computation in periods in which the effect would reduce the loss per share or increase the income per share. For diluted earnings per share, net income applicable to common shares can be affected by the conversion of the Company’s convertible preferred stock. Where the effect of this conversion would reduce the loss per share or increase the income per share, net income applicable to common shares is not adjusted by the associated preferred dividends.
Business Combinations	'
	Business Combinations
	The Company accounts for business combinations under the acquisition method of accounting in accordance with ASC 805, “Business Combinations” (“ASC 805”). The Company recognizes the full fair value of the assets acquired and liabilities assumed, immediately expenses transaction costs and accounts for restructuring plans separately from the business combination. There is no separate recognition of the acquired allowance for loan losses on the acquirer’s balance sheet as credit related factors are incorporated directly into the fair value of the loans recorded at the acquisition date. The excess of the cost of the acquisition over the fair value of the net tangible and intangible assets acquired is recorded as goodwill. Alternatively, a gain is recorded equal to the amount by which the fair value of assets purchased exceeds the fair value of liabilities assumed and consideration paid.
	Results of operations of the acquired business are included in the income statement from the effective date of acquisition.
	Loans comprise the majority of the assets acquired in nearly all of these FDIC-assisted transactions since 2010, most of which are subject to loss sharing agreements with the FDIC whereby the FDIC has agreed to reimburse the Company for 80% of losses incurred on the purchased loans, OREO, and certain other assets. Additionally, the loss share agreements with the FDIC require the Company to reimburse the FDIC in the event that actual losses on covered assets are lower than the original loss estimates agreed upon with the FDIC with respect of such assets in the loss share agreements. The Company refers to the loans subject to these loss-sharing agreements as “covered loans” and uses the term “covered assets” to refer to covered loans, covered OREO and certain other covered assets. The agreements with the FDIC require that the Company follow certain servicing procedures or risk losing the FDIC reimbursement of covered asset losses.
	On their respective acquisition dates in 2012, the Company announced that its wholly−owned subsidiary banks, Old Plank Trail Bank, Hinsdale Bank and Barrington Bank, acquired certain assets and liabilities and the banking operations of First United Bank, Second Federal and Charter National, respectively, in FDIC−assisted transactions. The loans covered by the loss sharing agreements are classified and presented as covered loans and the estimated reimbursable losses are recorded as an FDIC indemnification asset in the Consolidated Statements of Condition. The Company recorded the acquired assets and liabilities at their estimated fair values at the acquisition date. The fair value for loans reflected expected credit losses at the acquisition date. Therefore, the Company will only recognize a provision for credit losses and charge-offs on the acquired loans for any further credit deterioration subsequent to the acquisition date. See Note 5 - Allowance for Loan Losses, Allowance for Losses on Lending−Related Commitments and Impaired Loans for further discussion of the allowance on covered loans.
	The loss share agreements with the FDIC cover realized losses on loans, foreclosed real estate and certain other assets. These loss share assets are measured separately from the loan portfolios because they are not contractually embedded in the loans and are not transferable with the loans should the Company choose to dispose of them. Fair values at the acquisition dates were estimated based on projected cash flows available for loss−share based on the credit adjustments estimated for each loan pool and the loss share percentages. The loss share assets are recorded as FDIC indemnification assets on the Consolidated Statements of Condition. Subsequent to the acquisition date, reimbursements received from the FDIC for actual incurred losses will reduce the FDIC indemnification assets. Reductions to expected losses, to the extent such reductions to expected losses are the result of an improvement to the actual or expected cash flows from the covered assets, will also reduce the FDIC indemnification assets. Although these assets are contractual receivables from the FDIC, there are no contractual interest rates. Additions to expected losses will require an increase to the allowance for loan losses and a corresponding increase to the FDIC indemnification assets. The corresponding accretion is recorded as a component of non−interest income on the Consolidated Statements of Income.
Cash Equivalents	'
	Cash Equivalents
	For purposes of the consolidated statements of cash flows, Wintrust considers cash on hand, cash items in the process of collection, non-interest bearing amounts due from correspondent banks, federal funds sold and securities purchased under resale agreements with original maturities of three months or less, to be cash equivalents.
Securities	'
	Securities
	The Company classifies securities upon purchase in one of three categories: trading, held-to-maturity, or available-for-sale. Debt and equity securities held for resale are classified as trading securities. Debt securities for which the Company has the ability and positive intent to hold until maturity are classified as held-to-maturity. All other securities are classified as available-for-sale as they may be sold prior to maturity in response to changes in the Company’s interest rate risk profile, funding needs, demand for collateralized deposits by public entities or other reasons.
	Held-to-maturity securities are stated at amortized cost, which represents actual cost adjusted for premium amortization and discount accretion using methods that approximate the effective interest method. Available-for-sale securities are stated at fair value, with unrealized gains and losses, net of related taxes, included in shareholders’ equity as a separate component of other comprehensive income.
	Trading account securities are stated at fair value. Realized and unrealized gains and losses from sales and fair value adjustments are included in other non-interest income.
	Declines in the fair value of investment securities available for sale (with certain exceptions for debt securities noted below) that are deemed to be other-than-temporary are charged to earnings as a realized loss, and a new cost basis for the securities is established. In evaluating other-than-temporary impairment, management considers the length of time and extent to which the fair value has been less than cost, the financial condition and near-term prospects of the issuer, and the intent and ability of the Corporation to retain its investment in the issuer for a period of time sufficient to allow for any anticipated recovery in fair value in the near term. Declines in the fair value of debt securities below amortized cost are deemed to be other-than-temporary in circumstances where: (1) the Corporation has the intent to sell a security; (2) it is more likely than not that the Corporation will be required to sell the security before recovery of its amortized cost basis; or (3) the Corporation does not expect to recover the entire amortized cost basis of the security. If the Corporation intends to sell a security or if it is more likely than not that the Corporation will be required to sell the security before recovery, an other-than-temporary impairment write-down is recognized in earnings equal to the difference between the security’s amortized cost basis and its fair value. If an entity does not intend to sell the security or it is not more likely than not that it will be required to sell the security before recovery, the other-than-temporary impairment write-down is separated into an amount representing credit loss, which is recognized in earnings, and an amount related to all other factors, which is recognized in other comprehensive income.
	Interest and dividends, including amortization of premiums and accretion of discounts, are recognized as interest income when earned. Realized gains and losses on sales (using the specific identification method) and declines in value judged to be other-than-temporary are included in non-interest income.
Federal Home Loan Bank and Federal Reserve Bank Stock	'
	Federal Home Loan Bank and Federal Reserve Bank Stock
	Investments in Federal Home Loan Bank and Federal Reserve Bank stock are restricted as to redemption and are carried at cost.
Securities Purchased Under Resale Agreements and Securities Sold Under Repurchase Agreements	'
	Securities Purchased Under Resale Agreements and Securities Sold Under Repurchase Agreements
	Securities purchased under resale agreements and securities sold under repurchase agreements are generally treated as collateralized financing transactions and are recorded at the amount at which the securities were acquired or sold plus accrued interest. Securities, generally U.S. government and Federal agency securities, pledged as collateral under these financing arrangements cannot be sold by the secured party. The fair value of collateral either received from or provided to a third party is monitored and additional collateral is obtained or requested to be returned as deemed appropriate.
Brokerage Customer Receivables	'
	Brokerage Customer Receivables
	The Company, under an agreement with an out-sourced securities clearing firm, extends credit to its brokerage customers to finance their purchases of securities on margin. The Company receives income from interest charged on such extensions of credit. Brokerage customer receivables represent amounts due on margin balances. Securities owned by customers are held as collateral for these receivables.
Mortgage Loans Held-for-Sale	'
	Mortgage Loans Held-for-Sale
	Mortgage loans are classified as held-for-sale when originated or acquired with the intent to sell the loan into the secondary market. Market conditions or other developments may change management’s intent with respect to the disposition of these loans and loans previously classified as mortgage loans held-for-sale may be reclassified to the loan portfolio.
	ASC 825, “Financial Instruments” provides entities with an option to report selected financial assets and liabilities at fair value. Mortgage loans originated by Wintrust Mortgage are measured at fair value which is determined by reference to investor prices for loan products with similar characteristics. Changes in fair value are recognized in mortgage banking revenue.
Loans, Allowance for Loan Losses, Allowance for Covered Loan Losses and Allowance for Losses on Lending-Related Commitments	'
	Loans, Allowance for Loan Losses, Allowance for Covered Loan Losses and Allowance for Losses on Lending-Related Commitments
	Loans are generally reported at the principal amount outstanding, net of unearned income. Interest income is recognized when earned. Loan origination fees and certain direct origination costs are deferred and amortized over the expected life of the loan as an adjustment to the yield using methods that approximate the effective interest method. Finance charges on premium finance receivables are earned over the term of the loan, using a method which approximates the effective yield method.
	Interest income is not accrued on loans where management has determined that the borrowers may be unable to meet contractual principal and/or interest obligations, or where interest or principal is 90 days or more past due, unless the loans are adequately secured and in the process of collection. Cash receipts on non-accrual loans are generally applied to the principal balance until the remaining balance is considered collectible, at which time interest income may be recognized when received.
	The Company maintains its allowance for loan losses at a level believed appropriate by management to absorb probable losses inherent in the loan portfolio and is based on the size and current risk characteristics of the loan portfolio, an assessment of internal problem loan reporting system loans and actual loss experience, changes in the composition of the loan portfolio, historical loss experience, changes in lending policies and procedures, including underwriting standards and collections, charge-off and recovery practices, changes in experience, ability and depth of lending management and staff, changes in national and local economic and business conditions and developments, including the condition of various market segments and changes in the volume and severity of past due and classified loans and trends in the volume of non-accrual loans, troubled debt restructurings and other loan modifications. The allowance for loan losses also includes an element for estimated probable but undetected losses and for imprecision in the credit risk models used to calculate the allowance. Loans with a credit risk rating of a 6 through 9 are reviewed on a monthly basis to determine if (a) an amount is deemed uncollectible (a charge-off) or (b) it is probable that the Company will be unable to collect amounts due in accordance with the original contractual terms of the loan (an impaired loan). If a loan is impaired, the carrying amount of the loan is compared to the expected payments to be received, discounted at the loan’s original rate, or for collateral dependent loans, to the fair value of the collateral less the estimated cost to sell. Any shortfall is recorded as a specific reserve. For loans with a credit risk rating of 7 or better, reserves are established based on the type of loan collateral, if any, and the assigned credit risk rating. Determination of the allowance is inherently subjective as it requires significant estimates, including the amounts and timing of expected future cash flows on impaired loans, estimated losses on pools of homogeneous loans based on the average historical loss experience over a three year period, and consideration of current environmental factors and economic trends, all of which may be susceptible to significant change. Loan losses are charged off against the allowance, while recoveries are credited to the allowance. A provision for credit losses is charged to operations based on management’s periodic evaluation of the factors previously mentioned, as well as other pertinent factors. Evaluations are conducted at least quarterly and more frequently if deemed necessary.
	Under accounting guidance applicable to loans acquired with evidence of credit quality deterioration since origination, the excess of cash flows expected at acquisition over the estimated fair value is referred to as the accretable yield and is recognized in interest income over the remaining estimated life of the loans, using the effective-interest method. The difference between contractually required payments at acquisition and the cash flows expected to be collected at acquisition is referred to as the nonaccretable difference. Changes in the expected cash flows from the date of acquisition will either impact the accretable yield or result in a charge to the provision for credit losses. Subsequent decreases to expected principal cash flows will result in a charge to provision for credit losses and a corresponding increase to allowance for loan losses. Subsequent increases in expected principal cash flows will result in recovery of any previously recorded allowance for loan losses, to the extent applicable, and a reclassification from nonaccretable difference to accretable yield for any remaining increase. All changes in expected interest cash flows, including the impact of prepayments, will result in reclassifications to/from nonaccretable differences.
	In estimating expected losses, the Company evaluates loans for impairment in accordance ASC 310, “Receivables.” A loan is considered impaired when, based on current information and events, it is probable that a creditor will be unable to collect all amounts due pursuant to the contractual terms of the loan. Impaired loans include non-accrual loans, restructured loans or loans with principal and/or interest at risk, even if the loan is current with all payments of principal and interest. Impairment is measured by estimating the fair value of the loan based on the present value of expected cash flows, the market price of the loan, or the fair value of the underlying collateral less costs to sell. If the estimated fair value of the loan is less than the recorded book value, a valuation allowance is established as a component of the allowance for loan losses. For restructured loans in which impairment is calculated by the present value of future cash flows, the Company records interest income representing the decrease in impairment resulting from the passage of time during the respective period, which differs from interest income from contractually required interest on these specific loans.
	The Company also maintains an allowance for lending-related commitments, specifically unfunded loan commitments and letters of credit, to provide for the risk of loss inherent in these arrangements. The allowance is computed using a methodology similar to that used to determine the allowance for loan losses. This allowance is included in other liabilities on the statement of condition while the corresponding provision for these losses is recorded as a component of the provision for credit losses.
	In conjunction with FDIC-assisted transactions, the Company entered into loss share agreements with the FDIC. Additional expected losses, to the extent such expected losses result in the recognition of an allowance for loan losses, will increase the FDIC indemnification asset. The allowance for loan losses for loans acquired in FDIC-assisted transactions is determined without giving consideration to the amounts recoverable through loss share agreements (since the loss share agreements are separately accounted for and thus presented “gross” on the balance sheet). On the Consolidated Statements of Income, the provision for credit losses is reported net of changes in the amount recoverable under the loss share agreements. Reductions to expected losses, to the extent such reductions to expected losses are the result of an improvement to the actual or expected cash flows from the covered assets, will reduce the FDIC indemnification asset. Additions to expected losses will require an increase to the allowance for loan losses, and a corresponding increase to the FDIC indemnification asset. See "FDIC-Assisted Transactions" within Note 8 - Business Combinations for more detail.
Transfers and Servicing of Financial Assets, Policy [Policy Text Block]	'
	Mortgage Servicing Rights
	Mortgage Servicing Rights (“MSRs”) are recorded in the Consolidated Statements of Condition at fair value in accordance with ASC 860, “Transfers and Servicing.” The Company originates mortgage loans for sale to the secondary market, the majority of which are sold without retaining servicing rights. There are certain loans, however, that are originated and sold with servicing rights retained. MSRs associated with loans originated and sold, where servicing is retained, are capitalized at the time of sale at fair value based on the future net cash flows expected to be realized for performing the servicing activities, and included in other assets in the Consolidated Statements of Condition. The change in the fair value of MSRs is recorded as a component of mortgage banking revenue in non-interest income in the Consolidated Statements of Income. For purposes of measuring fair value, a third party valuation is obtained. This valuation stratifies the servicing rights into pools based on homogenous characteristics, such as product type and interest rate. The fair value of each servicing rights pool is calculated based on the present value of estimated future cash flows using a discount rate commensurate with the risk associated with that pool, given current market conditions. Estimates of fair value include assumptions about prepayment speeds, interest rates and other factors which are subject to change over time. Changes in these underlying assumptions could cause the fair value of MSRs to change significantly in the future.
	The Company recognizes MSR assets upon the sale of residential real estate loans when it retains the obligation to service the loans and the servicing fee is more than adequate compensation. The recognition of MSR assets and subsequent change in fair value are recognized in mortgage banking revenue. MSRs are subject to changes in value from actual and expected prepayment of the underlying loans. The Company does not specifically hedge the value of its MSRs.
	The Company uses a third party to assist in the valuation of its MSRs. Fair values are determined by using a discounted cash flow model that incorporates the objective characteristics of the portfolio as well as subjective valuation parameters that purchasers of servicing would apply to such portfolios sold into the secondary market. The subjective factors include loan prepayment speeds, interest rates, servicing costs and other economic factors.
Premises and Equipment	'
	Premises and Equipment
	Premises and equipment are stated at cost less accumulated depreciation and amortization. Depreciation and amortization are computed using the straight-line method over the estimated useful lives of the related assets. Useful lives range from two to ten years for furniture, fixtures and equipment, two to five years for software and computer-related equipment and seven to 39 years for buildings and improvements. Land improvements are amortized over a period of 15 years and leasehold improvements are amortized over the shorter of the useful life of the improvement or the term of the respective lease. Land and antique furnishings and artwork are not subject to depreciation. Expenditures for major additions and improvements are capitalized, and maintenance and repairs are charged to expense as incurred. Internal costs related to the configuration and installation of new software and the modification of existing software that provides additional functionality are capitalized.
	Long-lived depreciable assets are evaluated periodically for impairment when events or changes in circumstances indicate the carrying amount may not be recoverable. Impairment exists when the expected undiscounted future cash flows of a long-lived asset are less than its carrying value. In that event, a loss is recognized for the difference between the carrying value and the estimated fair value of the asset based on a quoted market price, if applicable, or a discounted cash flow analysis. Impairment losses are recognized in other non-interest expense.
FDIC Indemnification Asset	'
	FDIC Indemnification Asset
	In conjunction with FDIC-assisted transactions, the Company entered into loss share agreements with the FDIC. These agreements cover realized losses on loans, foreclosed real estate and certain other assets. These loss share assets are measured separately from the loan portfolios because they are not contractually embedded in the loans and are not transferable with the loans should the Company choose to dispose of them. Fair values at the acquisition dates were estimated based on projected cash flows available for loss-share based on the credit adjustments estimated for each loan pool and the loss share percentages. The loss share assets are also separately measured from the related loans and foreclosed real estate and recorded as FDIC indemnification assets on the Consolidated Statements of Condition. Subsequent to the acquisition date, reimbursements received from the FDIC for actual incurred losses will reduce the loss share assets. Reductions to expected losses, to the extent such reductions to expected losses are the result of an improvement to the actual or expected cash flows from the covered assets, will also reduce the loss share assets. Additional expected losses, to the extent such expected losses result in the recognition of an allowance for loan losses, will increase the loss share assets. The corresponding accretion is recorded as a component of non-interest income on the Consolidated Statements of Income. Although these assets are contractual receivables from the FDIC, there are no contractual interest rates.
Other Real Estate Owned	'
	Other Real Estate Owned
	Other real estate owned is comprised of real estate acquired in partial or full satisfaction of loans and is included in other assets. Other real estate owned is recorded at its estimated fair value less estimated selling costs at the date of transfer, with any excess of the related loan balance over the fair value less expected selling costs charged to the allowance for loan losses. Subsequent changes in value are reported as adjustments to the carrying amount and are recorded in other non-interest expense. Gains and losses upon sale, if any, are also charged to other non-interest expense.
Goodwill and Other Intangible Assets	'
	Goodwill and Other Intangible Assets
	Goodwill represents the excess of the cost of an acquisition over the fair value of net assets acquired. Other intangible assets represent purchased assets that also lack physical substance but can be distinguished from goodwill because of contractual or other legal rights or because the asset is capable of being sold or exchanged either on its own or in combination with a related contract, asset or liability. In accordance with accounting standards, goodwill is not amortized, but rather is tested for impairment on an annual basis or more frequently when events warrant, using a qualitative or quantitative approach. Intangible assets which have finite lives are amortized over their estimated useful lives and also are subject to impairment testing. All of the Company’s other intangible assets have finite lives and are amortized over varying periods not exceeding twenty years.
Bank-Owned Life Insurance	'
	Bank-Owned Life Insurance
	The Company owns BOLI on certain executives. BOLI balances are recorded at their cash surrender values and are included in other assets. Changes in the cash surrender values are included in non-interest income.
Derivative Instruments	'
	Derivative Instruments
	The Company enters into derivative transactions principally to protect against the risk of adverse price or interest rate movements on the future cash flows or the value of certain assets and liabilities. The Company is also required to recognize certain contracts and commitments, including certain commitments to fund mortgage loans held-for-sale, as derivatives when the characteristics of those contracts and commitments meet the definition of a derivative. The Company accounts for derivatives in accordance with ASC 815, “Derivatives and Hedging”, which requires that all derivative instruments be recorded in the statement of condition at fair value. The accounting for changes in the fair value of a derivative instrument depends on whether it has been designated and qualifies as part of a hedging relationship and further, on the type of hedging relationship.
	Derivative instruments designated in a hedge relationship to mitigate exposure to changes in the fair value of an asset or liability attributable to a particular risk, such as interest rate risk, are considered fair value hedges. Derivative instruments designated in a hedge relationship to mitigate exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges. Formal documentation of the relationship between a derivative instrument and a hedged asset or liability, as well as the risk-management objective and strategy for undertaking each hedge transaction and an assessment of effectiveness is required at inception to apply hedge accounting. In addition, formal documentation of ongoing effectiveness testing is required to maintain hedge accounting.
	Fair value hedges are accounted for by recording the changes in the fair value of the derivative instrument and the changes in the fair value related to the risk being hedged of the hedged asset or liability on the statement of condition with corresponding offsets recorded in the income statement. The adjustment to the hedged asset or liability is included in the basis of the hedged item, while the fair value of the derivative is recorded as a freestanding asset or liability. Actual cash receipts or payments and related amounts accrued during the period on derivatives included in a fair value hedge relationship are recorded as adjustments to the interest income or expense recorded on the hedged asset or liability.
	Cash flow hedges are accounted for by recording the changes in the fair value of the derivative instrument on the statement of condition as either a freestanding asset or liability, with a corresponding offset recorded in other comprehensive income within shareholders’ equity, net of deferred taxes. Amounts are reclassified from accumulated other comprehensive income to interest expense in the period or periods the hedged forecasted transaction affects earnings.
	Under both the fair value and cash flow hedge scenarios, changes in the fair value of derivatives not considered to be highly effective in hedging the change in fair value or the expected cash flows of the hedged item are recognized in earnings as non-interest income during the period of the change.
	Derivative instruments that are not designated as hedges according to accounting guidance are reported on the statement of condition at fair value and the changes in fair value are recognized in earnings as non-interest income during the period of the change.
	Commitments to fund mortgage loans (interest rate locks) to be sold into the secondary market and forward commitments for the future delivery of these mortgage loans are accounted for as derivatives and are not designated in hedging relationships. Fair values of these mortgage derivatives are estimated based on changes in mortgage rates from the date of the commitments. Changes in the fair values of these derivatives are included in mortgage banking revenue.
	Forward currency contracts used to manage foreign exchange risk associated with certain foreign currency denominated assets are accounted for as derivatives and are not designated in hedging relationships. Foreign currency derivatives are recorded at fair value based on prevailing currency exchange rates at the measurement date. Changes in the fair values of these derivatives resulting from fluctuations in currency rates are recognized in earnings as non-interest income during the period of change.
	Periodically, the Company sells options to an unrelated bank or dealer for the right to purchase certain securities held within the banks’ investment portfolios (“covered call options”). These option transactions are designed primarily as an economic hedge to increase the total return associated with holding these securities as earning assets. These transactions are not designated in hedging relationships pursuant to accounting guidance and, accordingly, changes in fair values of these contracts, are reported in other non-interest income.
Trust Assets, Assets Under Management and Brokerage Assets	'
	Trust Assets, Assets Under Management and Brokerage Assets
	Assets held in fiduciary or agency capacity for customers are not included in the consolidated financial statements as they are not assets of Wintrust or its subsidiaries. Fee income is recognized on an accrual basis and is included as a component of non-interest income.
Income Taxes	'
	Income Taxes
	Wintrust and its subsidiaries file a consolidated Federal income tax return. Income tax expense is based upon income in the consolidated financial statements rather than amounts reported on the income tax return. Deferred tax assets and liabilities are recognized for the estimated future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using currently enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized as an income tax benefit or income tax expense in the period that includes the enactment date.
	Positions taken in the Company’s tax returns may be subject to challenge by the taxing authorities upon examination. In accordance with applicable accounting guidance, uncertain tax positions are initially recognized in the financial statements when it is more likely than not the positions will be sustained upon examination by the tax authorities. Such tax positions are both initially and subsequently measured as the largest amount of tax benefit that is greater than 50% likely being realized upon settlement with the tax authority, assuming full knowledge of the position and all relevant facts. Interest and penalties on income tax uncertainties are classified within income tax expense in the income statement.
	The tax effect of fair value adjustments on securities available-for-sale and derivative instruments in cash flow hedges are recorded directly to shareholders' equity as part of other comprehensive income (loss). In addition, tax expense (benefit) of $831,000, ($1.4 million) and ($129,000) in 2013, 2012 and 2011, respectively, related to the exercise and expiration of certain stock options and vesting and issuance of restricted shares pursuant to the Stock Incentive Plans and the issuance of shares pursuant to the Directors Deferred Fee and Stock Plan, were recorded directly to shareholders’ equity.
Stock-Based Compensation Plans	'
	Stock-Based Compensation Plans
	In accordance with ASC 718, “Compensation — Stock Compensation”, compensation cost is measured as the fair value of the awards on their date of grant. A Black-Scholes model is utilized to estimate the fair value of stock options and the market price of the Company’s stock at the date of grant is used to estimate the fair value of restricted stock awards. Compensation cost is recognized over the required service period, generally defined as the vesting period. For awards with graded vesting, compensation cost is recognized on a straight-line basis over the requisite service period for the entire award.
	Accounting guidance requires the recognition of stock based compensation for the number of awards that are ultimately expected to vest. As a result, recognized compensation expense for stock options and restricted share awards is reduced for estimated forfeitures prior to vesting. Forfeitures rates are estimated for each type of award based on historical forfeiture experience. Estimated forfeitures will be reassessed in subsequent periods and may change based on new facts and circumstances.
	The Company issues new shares to satisfy option exercises and vesting of restricted shares.
	That cost is expected to be recognized over a weighted average period of approximately two years.
	The actual tax benefit realized upon the vesting of restricted shares is based on the fair value of the shares on the vesting date and the estimated tax benefit of the awards is based on fair value of the awards on the grant date. The actual tax benefit realized upon the vesting of restricted shares in 2013, 2012 and 2011 was $329,000, $15,000 and $(72,000), respectively, more/(less) than the estimated tax benefit for those shares. These differences in actual and estimated tax benefits were recorded directly to shareholders’ equity.
	Stock-based compensation is measured as the fair value of an award on the date of grant, and the measured cost is recognized over the period which the recipient is required to provide service in exchange for the award. The fair values of restricted shares and performance-based stock awards are determined based on the average of the high and low trading prices on the grant date, and the fair value of stock options is estimated using a Black-Scholes option-pricing model that utilizes the assumptions outlined in the following table. Option-pricing models require the input of highly subjective assumptions and are sensitive to changes in the option’s expected life and the price volatility of the underlying stock, which can materially affect the fair value estimate. Options granted in 2011, 2012 and 2013, were primarily granted as LTIP awards. The expected life of the options granted pursuant to the LTIP awards is based on the safe harbor rule of the SEC Staff Accounting Bulletin No. 107 “Share-Based Payment” as the Company believes historical exercise data may not provide a reasonable basis to estimate the expected term of these options. Expected stock price volatility is based on historical volatility of the Company’s common stock, which correlates with the expected life of the options, and the risk-free interest rate is based on comparable U.S. Treasury rates. Management reviews and adjusts the assumptions used to calculate the fair value of an option on a periodic basis to better reflect expected trends.
Comprehensive Income	'
	Comprehensive Income
	Comprehensive income consists of net income and other comprehensive income. Other comprehensive income includes unrealized gains and losses on securities available-for-sale, net of deferred taxes, adjustments related to cash flow hedges, net of deferred taxes and foreign currency translation adjustments, net of taxes.
Stock Repurchases	'
	Stock Repurchases
	The Company periodically repurchases shares of its outstanding common stock through open market purchases or other methods. Repurchased shares are recorded as treasury shares on the trade date using the treasury stock method, and the cash paid is recorded as treasury stock.
Foreign Currency Transactions and Translations Policy [Policy Text Block]	'
	Foreign Currency Translation
	The Company revalues assets, liabilities, revenue and expense denominated in non-U.S. currencies into U.S. dollars at the end of each month using applicable exchange rates.
	Gains and losses relating to translating functional currency financial statements for U.S. reporting are included in other comprehensive income. Gains and losses relating to nonfunctional currency transactions are reported in the Consolidated Statements of Income.
Loans and Leases Receivable, Troubled Debt Restructuring Policy [Policy Text Block]	'
	The Company’s approach to restructuring loans, excluding those acquired with evidence of credit quality deterioration since origination, is built on its credit risk rating system which requires credit management personnel to assign a credit risk rating to each loan. In each case, the loan officer is responsible for recommending a credit risk rating for each loan and ensuring the credit risk ratings are appropriate. These credit risk ratings are then reviewed and approved by the bank’s chief credit officer and/or concurrence credit officer. Credit risk ratings are determined by evaluating a number of factors including a borrower’s financial strength, cash flow coverage, collateral protection and guarantees. The Company’s credit risk rating scale is one through ten with higher scores indicating higher risk. In the case of loans rated six or worse following modification, the Company’s Managed Assets Division evaluates the loan and the credit risk rating and determines that the loan has been restructured to be reasonably assured of repayment and of performance according to the modified terms and is supported by a current, well-documented credit assessment of the borrower’s financial condition and prospects for repayment under the revised terms.
	A modification of a loan, excluding those acquired with evidence of credit quality deterioration since origination, with an existing credit risk rating of six or worse or a modification of any other credit, which will result in a restructured credit risk rating of six or worse must be reviewed for possible TDR classification. In that event, our Managed Assets Division conducts an overall credit and collateral review. A modification of these loans is considered to be a TDR if both (1) the borrower is experiencing financial difficulty and (2) for economic or legal reasons, the bank grants a concession to a borrower that it would not otherwise consider. The modification of a loan, excluding those acquired with evidence of credit quality deterioration since origination, where the credit risk rating is five or better both before and after such modification is not considered to be a TDR. Based on the Company’s credit risk rating system, it considers that borrowers whose credit risk rating is five or better are not experiencing financial difficulties and therefore, are not considered TDRs.
	All credits determined to be a TDR will continue to be classified as a TDR in all subsequent periods, unless the borrower has been in compliance with the loan’s modified terms for a period of six months (including over a calendar year-end) and the modified interest rate represented a market rate at the time of a restructuring. The Managed Assets Division, in consultation with the respective loan officer, determines whether the modified interest rate represented a current market rate at the time of restructuring. Using knowledge of current market conditions and rates, competitive pricing on recent loan originations, and an assessment of various characteristics of the modified loan (including collateral position and payment history), an appropriate market rate for a new borrower with similar risk is determined. If the modified interest rate meets or exceeds this market rate for a new borrower with similar risk, the modified interest rate represents a market rate at the time of restructuring. Additionally, before removing a loan from TDR classification, a review of the current or previously measured impairment on the loan and any concerns related to future performance by the borrower is conducted. If concerns exist about the future ability of the borrower to meet its obligations under the loans based on a credit review by the Managed Assets Division, the TDR classification is not removed from the loan. Loans classified as TDRs that are re-modified subsequent to the initial determination will continue to be classified as a TDRs following the re-modification, unless the requirements for removal from TDR classification discussed above are satisfied at the time of the re-modification.
	TDRs are reviewed at the time of modification and on a quarterly basis to determine if a specific reserve is necessary. The carrying amount of the loan is compared to the expected payments to be received, discounted at the loan’s original rate, or for collateral dependent loans, to the fair value of the collateral less the estimated cost to sell. Any shortfall is recorded as a specific reserve. The Company, in accordance with ASC 310-10, continues to individually measure impairment of these loans after the TDR classification is removed.
	Each TDR was reviewed for impairment at December 31, 2013 and approximately $4.8 million of impairment was present and appropriately reserved for through the Company’s normal reserving methodology in the Company’s allowance for loan losses. For TDRs in which impairment is calculated by the present value of future cash flows, the Company records interest income representing the decrease in impairment resulting from the passage of time during the respective period, which differs from interest income from contractually required interest on these specific loans. For the year-ended December 31, 2013 and 2012, the Company recorded $901,000 and $1.3 million, respectively, in interest income representing this decrease in impairment.
Finance, Loan and Lease Receivables, Held-for-investment, Allowance and Nonperforming Loans, Nonperforming Loans Policy [Policy Text Block]	'
	Non-performing loans include all non-accrual loans (8 and 9 risk ratings) as well as loans 90 days past due and still accruing interest, excluding loans acquired with evidence of credit quality deterioration since origination. The remainder of the portfolio is considered performing under the contractual terms of the loan agreement.
Finance, Loans and Leases Receivable, Policy [Policy Text Block]	'
	Certain premium finance receivables are recorded net of unearned income. The unearned income portions of such premium finance receivables were $41.9 million and $41.1 million at December 31, 2013 and 2012, respectively. Certain life insurance premium finance receivables attributable to the life insurance premium finance loan acquisition in 2009 as well as loans acquired with evidence of credit quality deterioration since origination are recorded net of credit discounts. See “Acquired Loan Information at Acquisition,” below.
	Total loans, excluding loans acquired with evidence of credit quality deterioration since origination, include net deferred loan fees and costs and fair value purchase accounting adjustments totaling $(9.2) million and $13.2 million at December 31, 2013 and 2012, respectively.
Receivables, Policy [Policy Text Block]	'
	Purchased loans acquired in a business combination are recorded at estimated fair value on their purchase date. Expected future cash flows at the purchase date in excess of the fair value of loans are recorded as interest income over the life of the loans if the timing and amount of the future cash flows is reasonably estimable (“accretable yield”). The difference between contractually required payments and the cash flows expected to be collected at acquisition is referred to as the non-accretable difference and represents probable losses in the portfolio.
	In determining the acquisition date fair value of purchased impaired loans, and in subsequent accounting, the Company aggregates these purchased loans into pools of loans by common risk characteristics, such as credit risk rating and loan type. Subsequent to the purchase date, increases in cash flows over those expected at the purchase date are recognized as interest income prospectively. Subsequent decreases to the expected cash flows will result in a provision for loan losses.
	The Company purchased a portfolio of life insurance premium finance receivables in 2009. These purchased life insurance premium finance receivables are valued on an individual basis with the accretable component being recognized into interest income using the effective yield method over the estimated remaining life of the loans. The non-accretable portion is evaluated each quarter and if the loans’ credit related conditions improve, a portion is transferred to the accretable component and accreted over future periods. In the event a specific loan prepays in whole, any remaining accretable and non-accretable discount is recognized in income immediately. If credit related conditions deteriorate, an allowance related to these loans will be established as part of the provision for credit losses.
	See Note 4 — Loans, for more information on loans acquired with evidence of credit quality deterioration since origination.
Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block]	'
	The customer list intangibles recognized in connection with the purchase of life insurance premium finance assets in 2009 are being amortized over an 18-year period on an accelerated basis.
	The core deposit intangibles recognized in connection with these acquisitions are being amortized over ten-year periods on an accelerated basis.
	The customer list intangible recognized in connection with the acquisition is being amortized over a ten-year period on a straight-line basis.
Debt, Policy [Policy Text Block]	'
	These prepayment fees are classified in other assets on the Consolidated Statements of Condition and are amortized as an adjustment to interest expense using the effective interest method.
	FHLB advances are stated at par value of the debt adjusted for unamortized fair value adjustments recorded in connection with advances acquired through acquisitions.
	In connection with the issuances of subordinated notes, the Company incurred costs totaling $1.0 million. These costs were included in other assets and were amortized to interest expense using a method that approximates the effective interest method. At December 31, 2013 the balances of these costs were fully amortized. At December 31, 2012, the unamortized balances of these costs were approximately $3,000.
	At issuance, the junior subordinated notes were recorded at their initial principal balance of $44.7 million, net of issuance costs.
	The QSPE issued $600 million Class A notes, which were reflected on the Company's Consolidated Statements of Condition as secured borrowings owed to securitization investors, that had an annual interest rate of one-month LIBOR plus 1.45%.
	The issuance costs were being amortized to interest expense using the effective-interest method.
Repurchase Agreements, Collateral, Policy [Policy Text Block]	'
	The Company records securities sold under repurchase agreements at their gross value and does not offset positions on the Consolidated Statements of Condition. As of December 31, 2013, the Company had pledged securities related to its customer balances in sweep accounts and short-term borrowing from brokers of $60.0 million and $191.3 million, respectively, which exceed the outstanding borrowings resulting in no net credit exposure. Securities pledged for customer balances in sweep accounts are maintained under the Company’s control and consist of U.S. Government agency, mortgage-backed and corporate securities. These securities are included in the available-for-sale securities portfolio as reflected on the Company’s Consolidated Statements of Condition.
Junior Subordinated Debentures Policy [Policy Text Block]	'
	The Trusts are reported in the Company’s consolidated financial statements as unconsolidated subsidiaries. Accordingly, in the Consolidated Statements of Condition, the junior subordinated debentures issued by the Company to the Trusts are reported as liabilities and the common securities of the Trusts, all of which are owned by the Company, are included in available-for-sale securities.
Income Tax Uncertainties, Policy [Policy Text Block]	'
	The Company is required to record a liability (or a reduction of an asset) for the uncertainty associated with certain tax positions. This liability, if any, reflects the fact that the Company has not recognized the benefit associated with the tax position. The Company had no unrecognized tax benefits at December 31, 2012 and it did not have increases or decreases in unrecognized tax benefits during 2013 and does not have any tax positions for which unrecognized tax benefits must be recorded at December 31, 2013. In addition, for the year ended December 31, 2013, the Company has no interest or penalties relating to income tax positions recognized in the income statement or in the balance sheet. If the Company were to record interest and penalties associated with uncertain tax positions or as a result of an audit by a tax jurisdiction, the interest and penalties would be included in income tax expense. The Company does not believe it is reasonably possible that unrecognized tax benefits will significantly change in the next 12 months.
Tangible Equity Unit Policy [Policy Text Block]	'
	The prepaid stock purchase contracts were recorded as surplus (a component of shareholders’ equity), net of issuance costs, and the junior subordinated amortizing notes were recorded as debt within other borrowings. Issuance costs associated with the debt component were recorded as a discount within other borrowings and were amortized over the term of the instrument to December 15, 2013 at which time they were paid off. The Company allocated the proceeds from the issuance of the TEU to equity and debt based on the relative fair values of the respective components of each unit.
	The aggregate fair values assigned to each component of the TEU offering were as follows:
	(Dollars and units in thousands, except unit price)		Equity		Debt		TEU
			Component		Component		Total
	Units issued (1)		4,600		4,600		4,600
	Unit price		$	40.271818	$	9.728182	$	50
	Gross proceeds		185,250		44,750		230,000
	Issuance costs, including discount		5,934		1,419		7,353
	Net proceeds		$	179,316	$	43,331	$	222,647
	Balance sheet impact
	Other borrowings		—		43,331		43,331
	Surplus		179,316		—		179,316
	-1	TEUs consisted of two components: one unit of the equity component and one unit of the debt component.
	The fair value of the debt component was determined using a discounted cash flow model using the following assumptions: (1) quarterly cash payments of 7.5%; (2) a maturity date of December 15, 2013; and (3) an assumed discount rate of 9.5%. The discount rate used for estimating the fair value was determined by obtaining yields for comparably-rated issuers trading in the market. The debt component was recorded at fair value, and the discount was amortized using the level yield method over the term of the instrument to the settlement date of December 15, 2013.
	The fair value of the equity component was determined using Black-Scholes valuation models applied to the range of stock prices contemplated by the terms of the TEU and using the following assumptions: (1) risk-free interest rate of 0.95%; (2) expected stock price volatility in the range of 35%-45%; (3) dividend yield plus stock borrow cost of 0.85%; and (4) term of 3.02 years.
	Each junior subordinated amortizing note, which had an initial principal amount of $9.728182, had a stated interest rate of 9.50% per annum, and had a scheduled final installment payment date of December 15, 2013. On each March 15, June 15, September 15 and December 15, the Company paid equal quarterly installments of $0.9375 on each amortizing note. The quarterly installment payable at March 15, 2011, however, was $0.989583. Each payment constituted a payment of interest and a partial repayment of principal. The issuance costs were amortized to interest expense using the effective-interest method.
	Each prepaid common stock purchase contract automatically settled on December 15, 2013 and the Company delivered 1.3333 shares of its common stock based on the applicable market value at that time (the average of the volume weighted average price of Company common stock for the twenty (20) consecutive trading days ending on the third trading day immediately preceding December 15, 2013). Upon settlement, an amount equal to $1.00 per common share issued was reclassified from surplus to common stock.

AvailableForSale_Securities_Ta

Available-For-Sale Securities (Tables)	12 Months Ended
	Dec. 31, 2013
Available-for-sale Securities [Abstract]	'
Summary of the Available-for-Sale Securities Portfolio	'
	A summary of the available-for-sale securities portfolio presenting carrying amounts and gross unrealized gains and losses as of December 31, 2013 and 2012 is as follows:
			December 31, 2013												31-Dec-12
	(Dollars in thousands)		Amortized			Gross			Gross			Fair Value			Amortized		Gross			Gross			Fair Value
			Cost			unrealized			unrealized						Cost		unrealized			unrealized
						gains			losses								gains			losses
	U.S. Treasury		$	354,262		$	141		$	(18,308	)	$	336,095		$	220,226	$	198		$	(937	)	$	219,487
	U.S. Government agencies		950,086			1,680			(56,078		)	895,688			986,186		4,839			(986		)	990,039
	Municipal		154,463			2,551			(4,298		)	152,716			107,868		2,899			(296		)	110,471
	Corporate notes:
	Financial issuers		129,362			1,993			(2,411		)	128,944			142,205		2,452			(3,982		)	140,675
	Other		5,994			105			(5		)	6,094			13,911		220			—			14,131
	Mortgage-backed: (1)
	Mortgage-backed securities		562,708			3,537			(18,047		)	548,198			188,485		8,805			(30		)	197,260
	Collateralized mortgage obligations		57,711			258			(942		)	57,027			73,386		928			—			74,314
	Other equity securities		50,532			1,493			(497		)	51,528			52,846		215			(3,362		)	49,699
	Total available-for-sale securities		$	2,265,118		$	11,758		$	(100,586	)	$	2,176,290		$	1,785,113	$	20,556		$	(9,593	)	$	1,796,076
	-1	Consisting entirely of residential mortgage-backed securities, none of which are subprime.
Schedule of Available-for-Sale Securities Portfolio Continuous Unrealized Loss Position	'
	The following table presents the portion of the Company’s available-for-sale securities portfolio which has gross unrealized losses, reflecting the length of time that individual securities have been in a continuous unrealized loss position at December 31, 2013:
			Continuous unrealized						Continuous unrealized						Total
			losses existing for less						losses existing for
			than 12 months						greater than 12 months
	(Dollars in thousands)		Fair value			Unrealized			Fair value			Unrealized			Fair value		Unrealized
						losses						losses					losses
	U.S. Treasury		$	75,695		$	(62	)	$	181,922		$	(18,246	)	$	257,617	$	(18,308	)
	U.S. Government agencies		399,982			(47,860		)	53,431			(8,218		)	453,413		(56,078		)
	Municipal		66,368			(3,757		)	10,529			(541		)	76,897		(4,298		)
	Corporate notes:
	Financial issuers		21,296			(49		)	66,834			(2,362		)	88,130		(2,411		)
	Other		995			(5		)	—			—			995		(5		)
	Mortgage-backed:
	Mortgage-backed securities		270,522			(18,008		)	2,922			(39		)	273,444		(18,047		)
	Collateralized mortgage obligations		40,449			(942		)	—			—			40,449		(942		)
	Other equity securities		8,272			(205		)	5,709			(292		)	13,981		(497		)
	Total		$	883,579		$	(70,888	)	$	321,347		$	(29,698	)	$	1,204,926	$	(100,586	)
	The following table presents the portion of the Company’s available-for-sale securities portfolio which has gross unrealized losses, reflecting the length of time that individual securities have been in a continuous unrealized loss position at December 31, 2012:
			Continuous unrealized						Continuous unrealized						Total
			losses existing for less						losses existing for
			than 12 months						greater than 12 months
	(Dollars in thousands)		Fair value			Unrealized			Fair			Unrealized			Fair value		Unrealized
						losses			value			losses					losses
	U.S. Treasury		$	199,250		$	(937	)	$	—		$	—		$	199,250	$	(937	)
	U.S. Government agencies		200,408			(986		)	—			—			200,408		(986		)
	Municipal		26,782			(295		)	512			(1		)	27,294		(296		)
	Corporate notes:
	Financial issuers		4,644			(13		)	91,970			(3,969		)	96,614		(3,982		)
	Other		—			—			—			—			—		—
	Mortgage-backed:
	Mortgage-backed securities		20,198			(30		)	—			—			20,198		(30		)
	Collateralized mortgage obligations		—			—			—			—			—		—
	Other equity securities		5,960			(40		)	22,078			(3,322		)	28,038		(3,362		)
	Total		$	457,242		$	(2,301	)	$	114,560		$	(7,292	)	$	571,802	$	(9,593	)
Schedule of Available-for-Sale Investment Securities Gross Gains and Gross Losses Realized	'
	The following table provides information as to the amount of gross gains and gross losses realized, other-than-temporary impairment charges and proceeds received through the sales of available-for-sale investment securities:
			Years Ended December 31,
	(Dollars in thousands)		2013			2012			2011
	Realized gains		$	434		$	4,918		$	1,874
	Realized losses		(106		)	(23		)	(82		)
	Net realized gains		$	328		$	4,895		$	1,792
	Other than temporary impairment charges		(3,328		)	—			—
	(Losses) gains on available-for-sale securities, net		$	(3,000	)	$	4,895		$	1,792
	Proceeds from sales of available-for-sale securities, net		$	138,274		$	2,399,035		$	1,265,046
Contractual Maturities of Available-for-Sale Securities	'
	The amortized cost and fair value of securities as of December 31, 2013 and December 31, 2012, by contractual maturity, are shown in the following table. Contractual maturities may differ from actual maturities as borrowers may have the right to call or repay obligations with or without call or prepayment penalties. Mortgage-backed securities are not included in the maturity categories in the following maturity summary as actual maturities may differ from contractual maturities because the underlying mortgages may be called or prepaid without penalties:
			December 31, 2013						December 31, 2012
	(Dollars in thousands)		Amortized			Fair Value			Amortized			Fair Value
			Cost						Cost
	Due in one year or less		$	268,847		$	269,168		$	188,594		$	189,015
	Due in one to five years		358,108			358,357			419,588			419,654
	Due in five to ten years		350,372			330,020			361,037			362,135
	Due after ten years		616,840			561,992			501,177			503,999
	Mortgage-backed		620,419			605,225			261,871			271,574
	Other equity securities		50,532			51,528			52,846			49,699
	Total available-for-sale securities		$	2,265,118		$	2,176,290		$	1,785,113		$	1,796,076

Loans_Tables

Loans (Tables)	12 Months Ended
	Dec. 31, 2013
Loans and Leases Receivable Disclosure [Abstract]	'
Summary of Loan Portfolio	'
	A summary of the loan portfolio at December 31, 2013 and 2012 is as follows:
	(Dollars in thousands)		December 31,			December 31,
			2013			2012
	Balance:
	Commercial		$	3,253,687		$	2,914,798
	Commercial real-estate		4,230,035			3,864,118
	Home equity		719,137			788,474
	Residential real-estate		434,992			367,213
	Premium finance receivables—commercial		2,167,565			1,987,856
	Premium finance receivables—life insurance		1,923,698			1,725,166
	Indirect consumer		50,680			77,333
	Consumer and other		116,808			103,985
	Total loans, net of unearned income, excluding covered loans		$	12,896,602		$	11,828,943
	Covered loans		346,431			560,087
	Total loans		$	13,243,033		$	12,389,030
	Mix:
	Commercial		25		%	24		%
	Commercial real-estate		32			31
	Home equity		5			6
	Residential real-estate		3			3
	Premium finance receivables—commercial		16			16
	Premium finance receivables—life insurance		15			14
	Indirect consumer		—			1
	Consumer and other		1			1
	Total loans, net of unearned income, excluding covered loans		97		%	96		%
	Covered loans		3			4
	Total loans		100		%	100		%
Unpaid Principal Balance and Carrying Value of Acquired Loans	'
	The following table presents the unpaid principal balance and carrying value for these acquired loans:
			31-Dec-13						31-Dec-12
	(Dollars in thousands)		Unpaid			Carrying			Unpaid			Carrying
			Principal			Value			Principal			Value
			Balance						Balance
	Bank acquisitions		$	453,944		$	338,517		$	674,868		$	503,837
	Life insurance premium finance loans acquisition		437,155			423,906			536,503			514,459
Estimated Details on Loans Acquired	'
	The following table provides estimated details on loans acquired in 2013 as of the date of acquisition:
	(Dollars in thousands)		FNBI			Diamond
	Contractually required payments including interest		$	32,022		$	47,853
	Less: Nonaccretable difference		8,890			12,898
	Cash flows expected to be collected (1)		23,132			34,955
	Less: Accretable yield		2,055			3,451
	Fair value of loans acquired with evidence of credit quality deterioration since origination		$	21,077		$	31,504
	-1	Represents undiscounted expected principal and interest cash flows at acquisition.
Activity Related to Accretable Yield of Loans Acquired with Evidence of Credit Quality Deterioration Since Origination	'
	Changes in expected cash flows may vary from period to period as the Company periodically updates its cash flow model assumptions for loans acquired with evidence of credit quality deterioration since origination. The factors that most significantly affect the estimates of gross cash flows expected to be collected, and accordingly the accretable yield, include changes in the benchmark interest rate indices for variable-rate products and changes in prepayment assumptions and loss estimates. The following table provides activity for the accretable yield of loans acquired with evidence of credit quality deterioration since origination.
			Years Ended December 31,
			2013						2012
	(Dollars in thousands)		Bank			Life Insurance			Bank			Life Insurance
			Acquisitions			Premium			Acquisitions			Premium
						Finance Loans						Finance Loans
	Accretable yield, beginning balance		$	143,224		$	13,055		$	173,120		$	18,861
	Acquisitions		5,428			—			8,217			—
	Accretable yield amortized to interest income		(36,898		)	(8,795		)	(52,101		)	(11,441		)
	Accretable yield amortized to indemnification asset (1)		(36,202		)	—			(66,798		)	—
	Reclassification from non-accretable difference (2)		50,873			2,840			64,603			4,096
	(Decreases) increases in interest cash flows due to payments and changes in interest rates		(18,770		)	1,154			16,183			1,539
	Accretable yield, ending balance (3)		$	107,655		$	8,254		$	143,224		$	13,055
	-1	Represents the portion of the current period accreted yield, resulting from lower expected losses, applied to reduce the loss share indemnfication asset.
	-2	Reclassification is the result of subsequent increases in expected principal cash flows.
	-3	As of December 31, 2013, the Company estimates that the remaining accretable yield balance to be amortized to the indemnification asset for the bank acquisitions is $33.7 million. The remainder of the accretable yield related to bank acquisitions is expected to be amortized to interest income.

Allowance_for_Loan_Losses_Allo1

Allowance for Loan Losses Allowance for Losses on Lending-Related Commitments and Impaired Loans (Tables)	12 Months Ended
	Dec. 31, 2013
Loans and Leases Receivable, Allowance [Abstract]	'
Schedule of Aging of the Company's Loan Portfolio	'
	The tables below show the aging of the Company’s loan portfolio at December 31, 2013 and 2012:
	As of December 31, 2013		Nonaccrual				90+ days				60-89				30-59			Current			Total Loans
	(Dollars in thousands)						and still				days past				days past
							accruing				due				due
	Loan Balances:
	Commercial
	Commercial and industrial		$	10,143			$	—			$	4,938			$	7,404		$	1,813,721		$	1,836,206
	Franchise		—				—				400				—			219,983			220,383
	Mortgage warehouse lines of credit		—				—				—				—			67,470			67,470
	Community Advantage — homeowners association		—				—				—				—			90,894			90,894
	Aircraft		—				—				—				—			10,241			10,241
	Asset-based lending		637				—				388				1,878			732,190			735,093
	Tax exempt		—				—				—				—			161,239			161,239
	Leases		—				—				—				788			109,043			109,831
	Other		—				—				—				—			11,147			11,147
	Purchased non-covered		—				274				156				1,685			9,068			11,183
	commercial (1)
	Total commercial		10,780				274				5,882				11,755			3,224,996			3,253,687
	Commercial real-estate:
	Residential construction		149				—				—				—			38,351			38,500
	Commercial construction		6,969				—				—				505			129,232			136,706
	Land		2,814				—				4,224				619			99,128			106,785
	Office		10,087				—				2,265				3,862			626,027			642,241
	Industrial		5,654				—				585				914			626,785			633,938
	Retail		10,862				—				837				2,435			642,125			656,259
	Multi-family		2,035				—				—				348			564,154			566,537
	Mixed use and other		8,088				230				3,943				15,949			1,344,244			1,372,454
	Purchased non-covered commercial real-estate (1)		—				18,582				3,540				5,238			49,255			76,615
	Total commercial real-estate		46,658				18,812				15,394				29,870			4,119,301			4,230,035
	Home equity		10,071				—				1,344				3,060			704,662			719,137
	Residential real estate		14,974				—				1,689				5,032			410,430			432,125
	Purchased non-covered residential real estate (1)		—				1,988				—				—			879			2,867
	Premium finance receivables
	Commercial insurance loans		10,537				8,842				6,912				24,094			2,117,180			2,167,565
	Life insurance loans		—				—				2,524				1,808			1,495,460			1,499,792
	Purchased life insurance loans (1)		—				—				—				—			423,906			423,906
	Indirect consumer		55				105				29				353			50,138			50,680
	Consumer and other		1,082				—				47				657			113,818			115,604
	Purchased non-covered consumer and other (1)		—				181				—				—			1,023			1,204
	Total loans, net of unearned income, excluding covered loans		$	94,157			$	30,202			$	33,821			$	76,629		$	12,661,793		$	12,896,602
	Covered loans		9,425				56,282				5,877				7,937			266,910			346,431
	Total loans, net of unearned income		$	103,582			$	86,484			$	39,698			$	84,566		$	12,928,703		$	13,243,033
	-1	Purchased loans represent loans acquired with evidence of credit quality deterioration since origination, in accordance with ASC 310-30. Loan agings are based upon contractually required payments. See Note 4 - Loans for further discussion of these purchased loans.
	As of December 31, 2012		Nonaccrual				90+ days				60-89				30-59			Current			Total Loans
	(Dollars in thousands)						and still				days past				days past
							accruing				due				due
	Loan Balances:
	Commercial
	Commercial and industrial		$	19,409			$	—			$	5,520			$	15,410		$	1,587,864		$	1,628,203
	Franchise		1,792				—				—				—			194,603			196,395
	Mortgage warehouse lines of credit		—				—				—				—			215,076			215,076
	Community Advantage — homeowners association		—				—				—				—			81,496			81,496
	Aircraft		—				—				148				—			17,216			17,364
	Asset-based lending		536				—				1,126				6,622			564,154			572,438
	Tax exempt		—				—				—				—			91,824			91,824
	Leases		—				—				—				896			89,547			90,443
	Other		—				—				—				—			16,549			16,549
	Purchased non-covered		—				496				432				7			4,075			5,010
	commercial (1)
	Total commercial		21,737				496				7,226				22,935			2,862,404			2,914,798
	Commercial real-estate
	Residential construction		3,110				—				4				41			37,246			40,401
	Commercial construction		2,159				—				885				386			167,525			170,955
Land		11,299				—				632				9,014			113,252			134,197
Office		4,196				—				1,889				3,280			560,346			569,711
Industrial		2,089				—				6,042				4,512			565,294			577,937
Retail		7,792				—				1,372				998			558,734			568,896
Multi-family		2,586				—				3,949				1,040			389,116			396,691
Mixed use and other		16,742				—				6,660				13,349			1,312,503			1,349,254
Purchased non-covered commercial real-estate (1)		—				749				2,663				2,508			50,156			56,076
Total commercial real-estate		49,973				749				24,096				35,128			3,754,172			3,864,118
Home equity		13,423				100				1,592				5,043			768,316			788,474
Residential real estate		11,728				—				2,763				8,250			343,616			366,357
Purchased non-covered residential real estate (1)		—				—				200				—			656			856
Premium finance receivables
Commercial insurance loans		9,302				10,008				6,729				19,597			1,942,220			1,987,856
Life insurance loans		25				—				—				5,531			1,205,151			1,210,707
Purchased life insurance loans (1)		—				—				—				—			514,459			514,459
Indirect consumer		55				189				51				442			76,596			77,333
Consumer and other		1,511				32				167				433			99,010			101,153
Purchased non-covered consumer and other (1)		—				66				32				101			2,633			2,832
Total loans, net of unearned income, excluding covered loans		$	107,754			$	11,640			$	42,856			$	97,460		$	11,569,233		$	11,828,943
Covered loans		1,988				122,350				16,108				7,999			411,642			560,087
Total loans, net of unearned income		$	109,742			$	133,990			$	58,964			$	105,459		$	11,980,875		$	12,389,030
-1	Purchased loans represent loans acquired with evidence of credit quality deterioration since origination, in accordance with ASC 310-30. Loan agings are based upon contractually required payments. See Note 4 - Loans for further discussion of these purchased loans.
Summary of Recorded Investment Based on Performance of Loans by Class	'
	The following table presents the recorded investment based on performance of loans by class, excluding covered loans, per the most recent analysis at December 31, 2013 and 2012:
			Performing								Non-performing							Total
			December 31,				December 31,				December 31,				December 31,			December 31,			December 31,
	(Dollars in thousands)		2013				2012				2013				2012			2013			2012
	Loan Balances:
	Commercial
	Commercial and industrial		$	1,826,063			$	1,608,794			$	10,143			$	19,409		$	1,836,206		$	1,628,203
	Franchise		220,383				194,603				—				1,792			220,383			196,395
	Mortgage warehouse lines of credit		67,470				215,076				—				—			67,470			215,076
	Community Advantage—homeowners association		90,894				81,496				—				—			90,894			81,496
	Aircraft		10,241				17,364				—				—			10,241			17,364
	Asset-based lending		734,456				571,902				637				536			735,093			572,438
	Tax exempt		161,239				91,824				—				—			161,239			91,824
	Leases		109,831				90,443				—				—			109,831			90,443
	Other		11,147				16,549				—				—			11,147			16,549
	Purchased non-covered commercial (1)		11,183				5,010				—				—			11,183			5,010
	Total commercial		3,242,907				2,893,061				10,780				21,737			3,253,687			2,914,798
	Commercial real-estate
	Residential construction		38,351				37,291				149				3,110			38,500			40,401
	Commercial construction		129,737				168,796				6,969				2,159			136,706			170,955
	Land		103,971				122,898				2,814				11,299			106,785			134,197
	Office		632,154				565,515				10,087				4,196			642,241			569,711
	Industrial		628,284				575,848				5,654				2,089			633,938			577,937
	Retail		645,397				561,104				10,862				7,792			656,259			568,896
	Multi-family		564,502				394,105				2,035				2,586			566,537			396,691
	Mixed use and other		1,364,136				1,332,512				8,318				16,742			1,372,454			1,349,254
	Purchased non-covered commercial real-estate (1)		76,615				56,076				—				—			76,615			56,076
	Total commercial real-estate		4,183,147				3,814,145				46,888				49,973			4,230,035			3,864,118
	Home equity		709,066				774,951				10,071				13,523			719,137			788,474
	Residential real estate		417,151				354,629				14,974				11,728			432,125			366,357
	Purchased non-covered residential real estate (1)		2,867				856				—				—			2,867			856
	Premium finance receivables
	Commercial insurance loans		2,148,186				1,968,546				19,379				19,310			2,167,565			1,987,856
	Life insurance loans		1,499,792				1,210,682				—				25			1,499,792			1,210,707
	Purchased life insurance loans (1)		423,906				514,459				—				—			423,906			514,459
	Indirect consumer		50,520				77,089				160				244			50,680			77,333
	Consumer and other		114,522				99,610				1,082				1,543			115,604			101,153
	Purchased non-covered consumer and other (1)		1,204				2,832				—				—			1,204			2,832
	Total loans, net of unearned income, excluding covered loans		$	12,793,268			$	11,710,860			$	103,334			$	118,083		$	12,896,602		$	11,828,943
	-1	Purchased loans represent loans acquired with evidence of credit quality deterioration since origination, in accordance with ASC 310-30. See Note 4 - Loans for further discussion of these purchased loans.
Summary of Activity in the Allowance for Credit Losses by Loan Portfolio	'
	A summary of the activity in the allowance for credit losses by loan portfolio (excluding covered loans) for the years ended December 31, 2013 and 2012 is as follows:
	Year Ended		Commercial				Commercial				Home				Residential			Premium			Indirect			Consumer			Total,
	December 31, 2013						Real-estate				Equity				Real-estate			Finance			Consumer			and Other			Excluding
	(Dollars in thousands)																	Receivable									Covered
																											Loans
	Allowance for credit losses
	Allowance for loan losses at beginning of period		$	28,794			$	52,135			$	12,734			$	5,560		$	6,096		$	267		$	1,765		$	107,351
	Other adjustments		(51		)		(783		)		3				(88		)	(19		)	—			—			(938		)
	Reclassification to/from allowance for unfunded lending-related commitments		—				640				—				—			—			—			—			640
	Charge-offs		(14,123		)		(32,745		)		(6,361		)		(2,958		)	(5,080		)	(130		)	(980		)	(62,377		)
	Recoveries		1,655				2,526				432				289			1,121			53			186			6,262
	Provision for credit losses		6,817				26,885				5,803				2,305			3,465			(8		)	717			45,984
	Allowance for loan losses at period end		$	23,092			$	48,658			$	12,611			$	5,108		$	5,583		$	182		$	1,688		$	96,922
	Allowance for unfunded lending-related commitments at period end		$	—			$	719			$	—			$	—		$	—		$	—		$	—		$	719
	Allowance for credit losses at period end		$	23,092			$	49,377			$	12,611			$	5,108		$	5,583		$	182		$	1,688		$	97,641
	Individually evaluated for impairment		1,392				4,653				1,593				655			—			—			109			8,402
	Collectively evaluated for impairment		21,637				44,724				11,018				4,390			5,583			182			1,578			89,112
	Loans acquired with deteriorated credit quality		63				—				—				63			—			—			1			127
	Loans at period end
	Individually evaluated for impairment		$	17,628			$	117,149			$	10,297			$	17,901		$	—		$	55		$	1,534		$	164,564
	Collectively evaluated for impairment		3,224,876				4,036,271				708,840				414,224			3,667,357			50,625			114,070			12,216,263
	Loans acquired with deteriorated credit quality		11,183				76,615				—				2,867			423,906			—			1,204			515,775
	Year Ended		Commercial				Commercial				Home				Residential			Premium			Indirect			Consumer			Total,
	December 31, 2012						Real-estate				Equity				Real-estate			Finance			Consumer			and Other			Excluding
	(Dollars in thousands)																	Receivable									Covered
																											Loans
	Allowance for credit losses
	Allowance for loan losses at beginning of period		$	31,237			$	56,405			$	7,712			$	5,028		$	7,214		$	645		$	2,140		$	110,381
	Other adjustments		(151		)		(1,054		)		(4		)		(124		)	—			—			—			(1,333		)
	Reclassification to/from allowance for unfunded lending-related commitments		45				648				—				—			—			—			—			693
	Charge-offs		(22,405		)		(43,539		)		(9,361		)		(4,060		)	(3,780		)	(221		)	(1,024		)	(84,390		)
	Recoveries		1,220				6,635				428				22			940			103			240			9,588
	Provision for credit losses		18,848				33,040				13,959				4,694			1,722			(260		)	409			72,412
	Allowance for loan losses at period end		$	28,794			$	52,135			$	12,734			$	5,560		$	6,096		$	267		$	1,765		$	107,351
	Allowance for unfunded lending-related commitments at period end		$	—			$	14,647			$	—			$	—		$	—		$	—		$	—		$	14,647
	Allowance for credit losses at period end		$	28,794			$	66,782			$	12,734			$	5,560		$	6,096		$	267		$	1,765		$	121,998
	Individually evaluated for impairment		$	3,296			$	20,481			$	2,569			$	1,169		$	—		$	—		$	142		$	27,657
	Collectively evaluated for impairment		$	25,471			$	46,233			$	10,165			$	4,388		$	6,096		$	267		$	1,623		$	94,243
	Loans acquired with deteriorated credit quality		$	27			$	68			$	—			$	3		$	—		$	—		$	—		$	98
	Loans at period end
	Individually evaluated for impairment		$	33,608			$	139,878			$	14,590			$	14,810		$	—		$	53		$	1,606		$	204,545
	Collectively evaluated for impairment		2,876,180				3,668,164				773,884				351,547			3,198,563			77,280			99,547			11,045,165
	Loans acquired with deteriorated credit quality		5,010				56,076				—				856			514,459			—			2,832			579,233
Summary of Activity in the Allowance for Covered Loan Losses	'
	A summary of activity in the allowance for covered loan losses for the years ended December 31, 2013 and 2012 is as follows:
			Years Ended
			December 31,				December 31,
	(Dollars in thousands)		2013				2012
	Balance at beginning of period		$	13,454			$	12,977
	Provision for covered loan losses before benefit attributable to FDIC loss share agreements		246				20,282
	Benefit attributable to FDIC loss share agreements		(197		)		(16,258		)
	Net provision for covered loan losses		49				4,024
	Increase in FDIC indemnification asset		197				16,258
	Loans charged-off		(15,085		)		(19,921		)
	Recoveries of loans charged-off		11,477				116
	Net charge-offs		(3,608		)		(19,805		)
	Balance at end of period		$	10,092			$	13,454
Summary of Impaired Loans, Including Restructured Loans	'
	A summary of impaired loans, including TDRs, at December 31, 2013 and 2012 is as follows:
	(Dollars in thousands)		2013				2012
	Impaired loans (included in non-performing and restructured loans):
	Impaired loans with an allowance for loan loss required (1)		$	92,184			$	89,983
	Impaired loans with no allowance for loan loss required		70,045				114,562
	Total impaired loans (2)		$	162,229			$	204,545
	Allowance for loan losses related to impaired loans		$	8,265			$	13,575
	Troubled debt restructurings		$	107,103			$	126,473
	Reduction of interest income from non-accrual loans		$	3,971			$	3,866
	Interest income recognized on impaired loans		$	8,920			$	10,819
	-1	These impaired loans require an allowance for loan losses because the estimated fair value of the loans or related collateral is less than the recorded investment in the loans.
	-2	Impaired loans are considered by the Company to be non-accrual loans, TDRs or loans with principal and/or interest at risk, even if the loan is current with all payments of principal and interest.
Summary of Impaired Loans Evaluated for Impairment by Loan Class	'
	The following tables present impaired loans evaluated for impairment by loan class as of December 31, 2013 and 2012:
			As of												For the Year Ended
	December 31, 2013		Recorded				Unpaid				Related				Average			Interest Income
	(Dollars in thousands)		Investment				Principal				Allowance				Recorded			Recognized
							Balance								Investment
	Impaired loans with a related ASC 310 allowance recorded
	Commercial
	Commercial and industrial		$	6,297			$	7,001			$	1,078			$	6,611		$	354
	Franchise		—				—				—				—			—
	Mortgage warehouse lines of credit		—				—				—				—			—
	Community Advantage—homeowners association		—				—				—				—			—
	Aircraft		—				—				—				—			—
	Asset-based lending		282				294				282				295			14
	Tax exempt		—				—				—				—			—
	Leases		—				—				—				—			—
	Other		—				—				—				—			—
	Commercial real-estate
	Residential construction		—				—				—				—			—
	Commercial construction		3,099				3,099				18				3,098			115
	Land		10,518				11,871				259				10,323			411
	Office		7,792				8,444				1,253				8,148			333
	Industrial		3,385				3,506				193				3,638			179
	Retail		17,511				17,638				1,253				17,678			724
	Multi-family		3,237				3,730				235				2,248			139
	Mixed use and other		28,935				29,051				1,366				26,792			1,194
	Home equity		3,985				5,238				1,593				4,855			236
	Residential real estate		6,876				7,023				626				6,335			273
	Premium finance receivables
	Commercial insurance		—				—				—				—			—
	Life insurance		—				—				—				—			—
	Purchased life insurance		—				—				—				—			—
	Indirect consumer		—				—				—				—			—
	Consumer and other		267				269				109				273			11
	Impaired loans with no related ASC 310 allowance recorded
	Commercial
	Commercial and industrial		$	9,890			$	16,333			$	—			$	13,928		$	1,043
	Franchise		—				—				—				—			—
	Mortgage warehouse lines of credit		—				—				—				—			—
	Community Advantage—homeowners association		—				—				—				—			—
	Aircraft		—				—				—				—			—
	Asset-based lending		354				2,311				—				2,162			121
	Tax exempt		—				—				—				—			—
	Leases		—				—				—				—			—
	Other		—				—				—				—			—
	Commercial real-estate
	Residential construction		1,463				1,530				—				1,609			64
	Commercial construction		7,710				13,227				—				9,680			722
	Land		5,035				8,813				—				5,384			418
	Office		10,379				11,717				—				10,925			610
	Industrial		5,087				5,267				—				5,160			328
	Retail		7,047				8,610				—				8,462			400
	Multi-family		608				1,030				—				903			47
	Mixed use and other		4,077				6,213				—				5,046			352
	Home equity		6,312				7,790				—				6,307			324
	Residential real estate		10,761				13,585				—				9,443			393
	Premium finance receivables
	Commercial insurance		—				—				—				—			—
	Life insurance		—				—				—				—			—
	Purchased life insurance		—				—				—				—			—
	Indirect consumer		55				61				—				48			6
	Consumer and other		1,267				1,804				—				1,307			109
	Total loans, net of unearned income, excluding covered loans		$	162,229			$	195,455			$	8,265			$	170,658		$	8,920
			As of												For the Year Ended
December 31, 2012		Recorded				Unpaid				Related				Average			Interest Income
(Dollars in thousands)		Investment				Principal				Allowance				Recorded			Recognized
						Balance								Investment
Impaired loans with a related ASC 310 allowance recorded
Commercial
Commercial and industrial		$	11,010			$	12,562			$	1,982			$	13,312		$	881
Franchise		1,792				1,792				1,259				1,792			122
Mortgage warehouse lines of credit		—				—				—				—			—
Community Advantage—homeowners association		—				—				—				—			—
Aircraft		—				—				—				—			—
Asset-based lending		511				511				55				484			26
Tax exempt		—				—				—				—			—
Leases		—				—				—				—			—
Other		—				—				—				—			—
Commercial real-estate
Residential construction		2,007				2,007				389				2,007			98
Commercial construction		1,865				1,865				70				1,865			78
Land		12,184				12,860				1,414				12,673			483
Office		5,829				5,887				622				5,936			246
Industrial		1,150				1,200				224				1,208			75
Retail		13,240				13,314				343				13,230			584
Multi-family		3,954				3,954				348				3,972			157
Mixed use and other		22,249				23,166				2,989				23,185			1,165
Home equity		7,270				7,313				2,569				7,282			271
Residential real estate		6,420				6,931				1,169				6,424			226
Premium finance receivables
Commercial insurance		—				—				—				—			—
Life insurance		—				—				—				—			—
Purchased life insurance		—				—				—				—			—
Indirect consumer		—				—				—				—			—
Consumer and other		502				502				142				502			26
Impaired loans with no related ASC 310 allowance recorded
Commercial
Commercial and industrial		$	20,270			$	27,574			$	—			$	23,877		$	1,259
Franchise		—				—				—				—			—
Mortgage warehouse lines of credit		—				—				—				—			—
Community Advantage—homeowners association		—				—				—				—			—
Aircraft		—				—				—				—			—
Asset-based lending		25				1,362				—				252			76
Tax exempt		—				—				—				—			—
Leases		—				—				—				—			—
Other		—				—				—				—			—
Commercial real-estate
Residential construction		4,085				4,440				—				4,507			143
Commercial construction		12,263				13,395				—				13,635			540
Land		12,163				17,141				—				14,646			906
Office		8,939				9,521				—				9,432			437
Industrial		3,598				3,776				—				3,741			181
Retail		18,073				18,997				—				19,067			892
Multi-family		2,817				4,494				—				4,120			222
Mixed use and other		15,462				17,210				—				16,122			912
Home equity		7,320				8,758				—				8,164			376
Residential real estate		8,390				9,189				—				9,069			337
Premium finance receivables
Commercial insurance		—				—				—				—			—
Life insurance		—				—				—				—			—
Purchased life insurance		—				—				—				—			—
Indirect consumer		53				61				—				65			6
Consumer and other		1,104				1,558				—				1,507			94
Total loans, net of unearned income, excluding covered loans		$	204,545			$	231,340			$	13,575			$	222,076		$	10,819
Summary of the Post-Modification Balance of Loans Restructured	'
	The tables below present a summary of the post-modification balance of loans restructured during the years ended December 31, 2013, 2012, and 2011, which represent TDRs:
	Year ended		Total (1)(2)							Extension at							Reduction of					Modification to					Forgiveness of Debt (2)
	December 31, 2013									Below Market							Interest Rate (2)					Interest-only
										Terms (2)												Payments (2)
	(Dollars in thousands)		Count			Balance				Count			Balance				Count		Balance			Count		Balance			Count			Balance
	Commercial
	Commercial and industrial		6			$	708			5			$	573			4		$	553		2		$	185		—			$	—
	Commercial real-estate
	Residential construction		—			—				—			—				—		—			—		—			—			—
	Commercial construction		3			6,120				3			6,120				—		—			3		6,120			—			—
	Land		3			2,639				3			2,639				2		287			—		—			1			73
	Office		4			4,021				4			4,021				1		556			—		—			—			—
	Industrial		1			949				1			949				1		949			—		—			—			—
	Retail		1			200				1			200				1		200			—		—			—			—
	Multi-family		1			705				1			705				1		705			—		—			—			—
	Mixed use and other		6			5,042				6			5,042				5		4,947			1		932			—			—
	Residential real estate and other		10			2,296				6			1,613				7		931			2		234			1			1,000
	Total loans		35			$	22,680			30			$	21,862			22		$	9,128		8		$	7,471		2			$	1,073
	Year ended		Total (1)(2)							Extension at							Reduction of					Modification to					Forgiveness of Debt (2)
	December 31, 2012									Below Market							Interest Rate (2)					Interest-only
										Terms (2)												Payments (2)
	(Dollars in thousands)		Count			Balance				Count			Balance				Count		Balance			Count		Balance			Count			Balance
	Commercial
	Commercial and industrial		18			$	14,311			11			$	3,603			11		$	13,691		7		$	10,579		3			$	2,311
	Commercial real-estate
	Residential construction		3			2,147				3			2,147				1		496			1		496			—			—
	Commercial construction		2			622				2			622				2		622			2		622			—			—
	Land		17			31,836				17			31,836				14		30,561			13		26,511			—			—
	Office		—			—				—			—				—		—			—		—			—			—
	Industrial		1			727				1			727				1		727			—		—			—			—
	Retail		8			13,518				8			13,518				6		8,865			6		12,897			—			—
	Multi-family		1			380				—			—				1		380			1		380			—			—
	Mixed use and other		15			7,333				9			4,769				11		6,268			8		3,974			—			—
	Residential real estate and other		10			1,638				8			1,390				6		631			3		924			1			29
	Total loans		75			$	72,512			59			$	58,612			53		$	62,241		41		$	56,383		4			$	2,340
	Year ended		Total (1)(2)							Extension at							Reduction of					Modification to					Forgiveness of Debt (2)
	December 31, 2011									Below Market							Interest Rate (2)					Interest-only
										Terms (2)												Payments (2)
	(Dollars in thousands)		Count			Balance				Count			Balance				Count		Balance			Count		Balance			Count			Balance
	Commercial
	Commercial and industrial		24			$	6,956			11			$	2,273			14		$	1,933		13		$	3,780		2			$	135
	Commercial real-estate
	Residential construction		1			1,105				1			1,105				—		—			1		1,105			—			—
	Commercial construction		8			12,140				7			11,673				3		9,402			1		467			—			—
	Land		7			7,971				7			7,971				2		2,981			—		—			—			—
	Office		9			8,870				6			4,780				6		4,036			3		4,292			—			—
	Industrial		5			5,334				5			5,334				4		3,494			2		2,181			—			—
	Retail		14			19,113				11			16,981				5		3,963			5		5,191			—			—
	Multi-family		6			4,415				6			4,415				5		3,866			—		—			—			—
	Mixed use and other		33			28,708				21			14,775				28		25,921			10		8,068			—			—
	Residential real estate and other		16			5,916				7			2,326				13		5,262			4		1,390			—			—
	Total loans		123			$	100,528			82			$	71,633			80		$	60,858		39		$	26,474		2			$	135
	-1	TDRs may have more than one modification representing a concession. As such, TDRs during the period may be represented in more than one of the categories noted above.
	-2	Balances represent the recorded investment in the loan at the time of the restructuring.
Troubled Debt Restructuring Subsequent Default [Table Text Block]	'
	The tables below present a summary of all loans restructured in TDRs during the years ended December 31, 2013, 2012, and 2011, and such loans which were in payment default under the restructured terms during the respective periods:
			Year Ended December 31, 2013														Year Ended December 31, 2012										Year Ended December 31, 2011
			Total (1)(3)							Payments in							Total (1)(3)					Payments in					Total (1)(3)					Payments in
										Default  (2)(3)												Default  (2)(3)										Default  (2)(3)
	(Dollars in thousands)		Count			Balance				Count			Balance				Count		Balance			Count		Balance			Count			Balance		Count	Balance
	Commercial
	Commercial and industrial		6			$	708			1			$	20			18		$	14,311		4		$	9,925		24			$	6,956	6	$	1,742
	Commercial real-estate
	Residential construction		—			—				—			—				3		2,147			—		—			1			1,105		—	—
	Commercial construction		3			6,120				—			—				2		622			2		622			8			12,140		1	467
	Land		3			2,639				1			215				17		31,836			2		3,786			7			7,971		2	1,667
	Office		4			4,021				1			1,648				—		—			—		—			9			8,870		2	2,239
	Industrial		1			949				—			—				1		727			—		—			5			5,334		2	3,224
	Retail		1			200				—			—				8		13,518			1		3,607			14			19,113		2	2,694
	Multi-family		1			705				1			705				1		380			—		—			6			4,415		—	—
	Mixed use and other		6			5,042				1			95				15		7,333			4		1,445			33			28,708		6	5,283
	Residential real estate and other		10			2,296				—			—				10		1,638			5		1,168			16			5,916		4	908
	Total loans		35			$	22,680			5			$	2,683			75		$	72,512		18		$	20,553		123			$	100,528	25	$	18,224
	-1	Total TDRs represent all loans restructured in TDRs during the year indicated.
	-2	TDRs considered to be in payment default are over 30 days past-due subsequent to the restructuring.
	-3	Balances represent the recorded investment in the loan at the time of the restructuring.

Mortgage_Servicing_Rights_Tabl

Mortgage Servicing Rights (Tables)	12 Months Ended
	Dec. 31, 2013
Disclosures Pertaining to Servicing Assets and Servicing Liabilities [Abstract]	'
Schedule of Servicing Assets at Fair Value [Table Text Block]	'
	Following is a summary of the changes in the carrying value of MSRs, accounted for at fair value, for the years ending December 31, 2013, 2012 and 2011:
		December 31,			December 31,			December 31,
	(Dollars in thousands)	2013			2012			2011
	Balance at beginning of year	$	6,750		$	6,700		$	8,762
	Additions from loans sold with servicing retained	523			4,151			2,611
	Estimate of changes in fair value due to:
	Payoffs and paydowns	(941		)	(3,808		)	(2,430		)
	Changes in valuation inputs or assumptions	2,614			(293		)	(2,243		)
	Fair value at end of year	$	8,946		$	6,750		$	6,700
	Unpaid principal balance of mortgage loans serviced for others	$	961,619		$	1,005,372		$	958,749

Business_Combinations_Tables

Business Combinations (Tables)	12 Months Ended
	Dec. 31, 2013
Business Combinations [Abstract]	'
Summary of Acquisition of Certain Assets and the Assumption of Liabilities, of Six Financial Institutions in FDIC-Assisted Transactions	'
	Since January 1, 2012, the Company has acquired the banking operations, including the acquisition of certain assets and the assumption of liabilities, of three financial institutions in FDIC-assisted transactions. The following table presents details related to these three transactions:
	(Dollars in thousands)		Charter			Second			First United Bank
			National			Federal (1)
	Date of acquisition		February 10,			July 20,			September 28,
			2012			2012			2012
	Fair value of assets acquired, at the acquisition date		$	92,355		$	171,625		$	328,408
	Fair value of loans acquired, at the acquisition date		45,555			—			77,964
	Fair value of liabilities assumed, at the acquisition date		91,570			171,582			321,734
	Fair value of reimbursable losses, at the acquisition date(2)		13,164			—			67,190
	Gain on bargain purchase recognized		785			43			6,675
	-1	Subsequent to the acquisition of Second Federal, deposits and banking operations were divested to an unaffiliated financial institution. See "Divestiture of Previous FDIC-Assisted Acquisition" below for further discussion.
	-2	As no assets subject to loss sharing agreements were acquired in the acquisition of Second Federal, there was no fair value of reimbursable losses.
Summary of FDIC Indemnification Asset	'
	The following table summarizes the activity in the Company’s FDIC indemnification asset during the periods indicated:
			Year Ended December 31,
	(Dollars in thousands)		2013			2012
	Balance at beginning of period		$	208,160		$	344,251
	Additions from acquisitions		—			80,354
	Additions from reimbursable expenses		13,022			21,859
	Amortization		(7,556		)	(7,209		)
	Changes in expected reimbursements from the FDIC for changes in expected credit losses		(74,511		)	(61,406		)
	Payments received from the FDIC		(53,443		)	(169,689		)
	Balance at end of period		$	85,672		$	208,160

Goodwill_and_Other_Intangible_1

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill Assets by Business Segment	'
	A summary of the Company’s goodwill assets by business segment is presented in the following table:
	(Dollars in thousands)		January 1,			Goodwill			Impairment		Goodwill Adjustments			December 31,
			2013			Acquired			Loss					2013
	Community banking		$	274,963		$	31,846		$	—	$	(1,496	)	$	305,313
	Specialty finance		38,574			—			—		(1,204		)	37,370
	Wealth management		31,864			—			—		—			31,864
	Total		$	345,401		$	31,846		$	—	$	(2,700	)	$	374,547
Summary of Finite-Lived Intangible Assets	'
	A summary of finite-lived intangible assets as of the dates shown and the expected amortization as of December 31, 2013 is as follows:
			December 31,
	(Dollars in thousands)		2013			2012
	Community banking segment:
	Core deposit intangibles:
	Gross carrying amount		$	40,770		$	38,176
	Accumulated amortization		(29,189		)	(25,159		)
	Net carrying amount		$	11,581		$	13,017
	Specialty finance segment:
	Customer list intangibles:
	Gross carrying amount		$	1,800		$	1,800
	Accumulated amortization		(805		)	(645		)
	Net carrying amount		$	995		$	1,155
	Wealth management segment:
	Customer list and other intangibles:
	Gross carrying amount		$	7,690		$	7,390
	Accumulated amortization		(1,053		)	(615		)
	Net carrying amount		$	6,637		$	6,775
	Total other intangible assets, net		$	19,213		$	20,947
Estimated Amortization	'
	Estimated amortization
	Estimated—2014	$	4,369
	Estimated—2015	2,791
	Estimated—2016	2,180
	Estimated—2017	1,764
	Estimated—2018	1,544

Premises_and_Equipment_Net_Tab

Premises and Equipment, Net (Tables)	12 Months Ended
	Dec. 31, 2013
Property, Plant and Equipment [Abstract]	'
Summary of Premises and Equipment	'
	A summary of premises and equipment at December 31, 2013 and 2012 is as follows:
		December 31,
	(Dollars in thousands)	2013		2012
	Land	$	116,906	$	105,427
	Buildings and leasehold improvements	440,456		415,502
	Furniture, equipment, and computer software	144,854		134,945
	Construction in progress	17,966		10,353
		720,182		666,227
	Less: Accumulated depreciation and amortization	188,235		165,022
	Total premises and equipment, net	$	531,947	$	501,205

Deposits_Tables

Deposits (Tables)	12 Months Ended
	Dec. 31, 2013
Deposits [Abstract]	'
Summary of Deposits	'
	The following is a summary of deposits at December 31, 2013 and 2012:
	(Dollars in thousands)	2013			2012
	Balance:
	Non-interest bearing	$	2,721,771		$	2,396,264
	NOW	1,953,882			2,022,957
	Wealth management deposits	1,013,850			991,902
	Money market	3,359,999			2,761,498
	Savings	1,392,575			1,275,012
	Time certificates of deposit	4,226,712			4,980,911
	Total deposits	$	14,668,789		$	14,428,544
	Mix:
	Non-interest bearing	19		%	17		%
	NOW	13			14
	Wealth management deposits	7			7
	Money market	23			19
	Savings	9			9
	Time certificates of deposit	29			34
	Total deposits	100		%	100		%
Schedule of Maturities of Time Certificates of Deposit	'
	The scheduled maturities of time certificates of deposit at December 31, 2013 and 2012 are as follows:
	(Dollars in thousands)	2013			2012
	Due within one year	$	2,640,757		$	3,314,646
	Due in one to two years	908,443			1,042,769
	Due in two to three years	465,788			377,180
	Due in three to four years	131,455			135,003
	Due in four to five years	74,647			105,944
	Due after five years	5,622			5,369
	Total time certificate of deposits	$	4,226,712		$	4,980,911
Schedule of Maturities of Time Deposits	'
	The following table sets forth the scheduled maturities of time deposits in denominations of $100,000 or more at December 31, 2013 and 2012:
	(Dollars in thousands)	2013			2012
	Maturing within three months	$	584,948		$	591,901
	After three but within six months	395,118			719,425
	After six but within 12 months	647,389			982,407
	After 12 months	1,088,954			1,073,016
	Total	$	2,716,409		$	3,366,749

Federal_Home_Loan_Bank_Advance1

Federal Home Loan Bank Advances (Tables)	12 Months Ended
	Dec. 31, 2013
Advances from Federal Home Loan Banks [Abstract]	'
Summary of Outstanding FHLB Advances	'
	A summary of the outstanding FHLB advances at December 31, 2013 and 2012, is as follows:
	(Dollars in thousands)	2013		2012
	1.45% advance due July 2013	—		26,000
	0.13% advance due January 2014	30,000		—
	1.94% advance due July 2014	10,000		10,000
	1.58% advance due September 2014	25,127		25,300
	1.63% advance due September 2014	25,135		25,322
	0.72% advance due February 2015	141,000		141,000
	0.73% advance due February 2015	5,000		5,000
	0.99% advance due February 2016	26,500		26,500
	1.25% advance due February 2017	25,000		25,000
	3.47% advance due November 2017	10,000		10,000
	1.49% advance due February 2018	95,000		95,000
	4.18% advance due February 2022	25,000		25,000
	Total Federal Home Loan Bank advances	$	417,762	$	414,122

Other_Borrowings_Tables

Other Borrowings (Tables)	12 Months Ended
	Dec. 31, 2013
Other Borrowings [Abstract]	'
Summary Of Other Borrowings	'
	The following is a summary of other borrowings at December 31, 2013 and 2012:
	(Dollars in thousands)	2013		2012
	Securities sold under repurchase agreements	$	235,347	$	238,401
	Other	19,393		36,010
	Secured borrowings — owed to securitization investors	—		—
	Total other borrowings	$	254,740	$	274,411

Junior_Subordinated_Debentures1

Junior Subordinated Debentures (Tables)	12 Months Ended
	Dec. 31, 2013
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust [Abstract]	'
Summary of the Company's Junior Subordinated Debentures	'
	The following table provides a summary of the Company’s junior subordinated debentures as of December 31, 2013 and 2012. The junior subordinated debentures represent the par value of the obligations owed to the Trusts.
		Common Securities		Trust Preferred Securities		Junior				Rate Structure	Contractual rate at 12/31/2013			Maturity Date	Earliest Redemption Date
						Subordinated
						Debentures
	(Dollars in thousands)					2013		2012					Issue Date
	Wintrust Capital Trust III	$	774	$	25,000	$	25,774	$	25,774	L+3.25	3.49	%	Apr-03	Apr-33	Apr-08
	Wintrust Statutory Trust IV	619		20,000		20,619		20,619		L+2.80	3.05	%	Dec-03	Dec-33	Dec-08
	Wintrust Statutory Trust V	1,238		40,000		41,238		41,238		L+2.60	2.85	%	May-04	May-34	Jun-09
	Wintrust Capital Trust VII	1,550		50,000		51,550		51,550		L+1.95	2.19	%	Dec-04	Mar-35	Mar-10
	Wintrust Capital Trust VIII	1,238		40,000		41,238		41,238		L+1.45	1.7	%	Aug-05	Sep-35	Sep-10
	Wintrust Capital Trust IX	1,547		50,000		51,547		51,547		L+1.63	1.87	%	Sep-06	Sep-36	Sep-11
	Northview Capital Trust I	186		6,000		6,186		6,186		L+3.00	3.24	%	Aug-03	Nov-33	Aug-08
	Town Bankshares Capital Trust I	186		6,000		6,186		6,186		L+3.00	3.24	%	Aug-03	Nov-33	Aug-08
	First Northwest Capital Trust I	155		5,000		5,155		5,155		L+3.00	3.25	%	May-04	May-34	May-09
	Total					$	249,493	$	249,493		2.43	%

Minimum_Lease_Commitments_Tabl

Minimum Lease Commitments (Tables)	12 Months Ended
	Dec. 31, 2013
Leases [Abstract]	'
Approximate Minimum Annual Gross Rental Payments and Gross Rental Income	'
	The approximate minimum annual gross rental payments and gross rental income under noncancelable agreements for office space with remaining terms in excess of one year as of December 31, 2013, are as follows (in thousands):
		Payments		Income
	2014	$	5,112	$	5,089
	2015	5,180		4,941
	2016	4,852		4,248
	2017	4,343		3,636
	2018	3,693		3,025
	2019 and thereafter	9,851		4,330
	Total minimum future amounts	$	33,031	$	25,269

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Income Tax Expense (Benefit)	'
	Income tax expense (benefit) for the years ended December 31, 2013, 2012 and 2011 is summarized as follows:
		Years Ended December 31,
	(Dollars in thousands)	2013			2012			2011
	Current income taxes:
	Federal	$	67,449		$	74,109		$	40,312
	State	16,046			16,224			10,785
	Foreign	2,196			1,918			—
	Total current income taxes	$	85,691		$	92,251		$	51,097
	Deferred income taxes:
	Federal	1,813			(19,550		)	(555		)
	State	(114		)	(4,206		)	(84		)
	Foreign	(160		)	441			—
	Total deferred income taxes	1,539			(23,315		)	(639		)
	Total income tax expense	$	87,230		$	68,936		$	50,458
Reconciliation of the Differences Between Taxes Computed Using the Statutory Federal Income Tax Rate and Actual Income Tax Expense	'
	A reconciliation of the differences between taxes computed using the statutory Federal income tax rate of 35% and actual income tax expense is as follows:
		Years Ended December 31,
	(Dollars in thousands)	2013			2012			2011
	Income tax expense based upon the Federal statutory rate on income before income taxes	$	78,554		$	63,046		$	44,812
	Increase (decrease) in tax resulting from:
	Tax-exempt interest, net of interest expense disallowance	(1,423		)	(1,294		)	(1,139		)
	State taxes, net of federal tax benefit	10,355			7,811			6,955
	Income earned on bank owned life insurance	(1,157		)	(974		)	(854		)
	Non-deductible compensation costs	654			1,156			644
	Meals, entertainment and related expenses	993			931			802
	Foreign subsidiary, net	588			1,991			—
	Foreign tax credits	—			(2,177		)	—
	Tax credits, excluding foreign tax credits	(1,553		)	(1,906		)	(562		)
	Other, net	219			352			(200		)
	Income tax expense	$	87,230		$	68,936		$	50,458
Deferred Tax Assets and Liabilities	'
	The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and liabilities at December 31, 2013 and 2012 are as follows:
		Years Ended December 31,
	(Dollars in thousands)	2013			2012
	Deferred tax assets:
	Allowance for credit losses	$	37,525		$	42,480
	Net unrealized losses on derivatives included in other comprehensive income	1,574			3,442
	Net unrealized losses on securities included in other comprehensive income	35,216			—
	Deferred compensation	16,089			7,453
	Stock-based compensation	10,340			11,333
	Nonaccrued interest	1,895			3,053
	Other real estate owned	6,405			9,193
	Mortgage banking recourse obligation	1,503			1,706
	Covered assets	13,616			7,527
	Pension plan liabilities	1,035			916
	Federal net operating loss carryforward	2,452			—
	AMT credit carryforward	1,346			345
	State tax losses carryforward	3,294			130
	Foreign tax credit carryforward	—			1,042
	Other	2,149			2,072
	Total gross deferred tax assets	134,439			90,692
	Deferred tax liabilities:
	Discount on purchased loans	5,718			27,458
	Premises and equipment	36,847			29,725
	Goodwill and intangible assets	1,683			338
	Deferred loan fees and costs	4,533			4,487
	FHLB stock dividends	1,431			1,610
	Capitalized servicing rights	3,547			2,670
	Net unrealized gains on securities included in other comprehensive income	—			4,336
	Fair value adjustments on loans	6,947			6,634
	Other	3,606			2,680
	Total gross deferred liabilities	64,312			79,938
	Valuation allowance	—			1,042
	Net deferred tax assets	$	70,127		$	9,712

Stock_Compensation_Plans_and_O1

Stock Compensation Plans and Other Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2013
Share-based Compensation [Abstract]	'
Weighted Average Assumptions Used to Determine the Options Fair Value	'
	The following table presents the weighted average assumptions used to determine the fair value of options granted in the years ending December 31, 2013, 2012 and 2011:
			2013		2012		2011
	Expected dividend yield		0.5	%	0.6	%	0.5	%
	Expected volatility		59	%	62.6	%	61.8	%
	Risk-free rate		1	%	0.7	%	1	%
	Expected option life (in years)		4.5		4.5		4.4
Summary of Stock Option Activity	'
	A summary of the Plans’ stock option activity for the years ended December 31, 2013, 2012 and 2011 is as follows:
	Stock Options		Common		Weighted Average			Remaining		Intrinsic Value(2)
			Shares		Strike Price			Contractual Term(1)		$0
	Outstanding at January 1, 2011		2,040,701		$	38.92
	Granted		221,003		33.15
	Exercised		(85,706	)	17.2
	Forfeited or canceled		(111,464	)	46.01
	Outstanding at December 31, 2011		2,064,534		$	38.83		2.7		$	3,809
	Exercisable at December 31, 2011		1,779,218		$	39.93		2.3		$	3,558
	Outstanding at January 1, 2012		2,064,534		$	38.83
	Granted		250,997		31.16
	Exercised		(484,709	)	21.43
	Forfeited or canceled		(85,395	)	43.7
	Outstanding at December 31, 2012		1,745,427		$	42.31		3.1		$	3,836
	Exercisable at December 31, 2012		1,346,287		$	45.57		2.3		$	1,677
	Outstanding at January 1, 2013		1,745,427		$	42.31
	Granted		236,120		38.01
	Exercised		(371,826	)	40.46
	Forfeited or canceled		(85,049	)	44.12
	Outstanding at December 31, 2013		1,524,672		$	42		2.6		$	11,021
	Exercisable at December 31, 2013		1,097,836		$	44.82		1.5		$	6,165
	Vested or expected to vest at December 31, 2013		1,522,161		$	42.02
	-1	Represents the weighted average contractual remaining life in years.
	-2	Aggregate intrinsic value represents the total pretax intrinsic value (i.e., the difference between the Company’s stock price at year end and the option exercise price, multiplied by the number of shares) that would have been received by the option holders if they had exercised their options on the last day of the year. Options with exercise prices above the year end stock price are excluded from the calculation of intrinsic value. The intrinsic value will change based on the fair market value of the Company’s stock.
Summary of Plans' Restricted Share Award Activity	'
	A summary of the Plans’ restricted share and performance-based stock award activity for the years ended December 31, 2013, 2012 and 2011 is as follows:
			2013					2012					2011
	Restricted Shares		Common		Weighted			Common			Weighted		Common		Weighted
			Shares		Average			Shares			Average		Shares		Average
					Grant-Date						Grant-Date				Grant-Date
					Fair Value						Fair Value				Fair Value
	Outstanding at January 1		314,226		$	37.99		336,709			$	38.29	299,040		$	39.44
	Granted		16,932		42.14			111,207			32.37		98,394		32.85
	Vested and issued		(144,860	)	31.83			(132,337	)		34.12		(56,641	)	35.17
	Forfeited		(4,776	)	33.93			(1,353	)		30.99		(4,084	)	34.73
	Outstanding at end of year		181,522		$	43.39		314,226			$	37.99	336,709		$	38.29
	Vested, but not issuable at end of year		85,000		$	51.88		85,000			$	51.88	85,000		$	51.88
	Performance Shares
	Outstanding at January 1		153,915		$	31.78		72,158			$	33.25	—		$	—
	Granted		106,268		37.9			119,476			31.1		100,993		33.25
	Vested and issued		—		—			—			—		—		—
	Net decrease due to estimated performance		(106,005	)	34.17			(33,147	)		32.5		(28,062	)	33.25
	Forfeited		(10,322	)	34.19			(4,572	)		31.98		(773	)	33.28
	Outstanding at end of year		143,856		$	34.37		153,915			$	31.78	72,158		$	33.25

Regulatory_Matters_Tables

Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2013
Regulatory Capital Requirements [Abstract]	'
Minimum Capital Requirements	'
	As reflected in the following table, the Company met all minimum capital requirements at December 31, 2013 and 2012:
		2013		2012
	Total Capital to Risk Weighted Assets	12.9	%	13.1	%
	Tier 1 Capital to Risk Weighted Assets	12.2	%	12.1	%
	Tier 1 Leverage Ratio	10.5	%	10	%
Actual Capital Amounts And Ratios	'
	The banks’ actual capital amounts and ratios as of December 31, 2013 and 2012 are presented in the following table:
	(Dollars in thousands)	December 31, 2013									December 31, 2012
		Actual					To Be Well				Actual				To Be Well
							Capitalized by								Capitalized by
							Regulatory Definition								Regulatory Definition
		Amount			Ratio		Amount		Ratio		Amount		Ratio		Amount		Ratio
	Total Capital (to Risk Weighted Assets):
	Lake Forest Bank	$	236,055		11.7	%	$	202,443	10	%	$	226,234	11	%	$	205,188	10	%
	Hinsdale Bank	152,266			11.4		134,106		10		154,677		12.2		126,837		10
	North Shore Community Bank	232,454			11.6		200,806		10		202,823		11.5		176,124		10
	Libertyville Bank	111,396			11.4		97,777		10		116,818		11.9		97,880		10
	Barrington Bank	128,924			11		117,103		10		148,382		13.5		109,526		10
	Crystal Lake Bank	85,922			13		66,066		10		84,310		14.5		58,091		10
	Northbrook Bank	142,512			11		130,208		10		139,603		12.2		114,057		10
	Schaumburg Bank	70,728			11.4		62,130		10		68,305		11.8		57,946		10
	Village Bank	95,359			11		86,435		10		92,787		11.5		80,441		10
	Beverly Bank	70,754			11.2		63,251		10		61,994		11.1		55,697		10
	Town Bank	85,647			11.2		76,234		10		83,144		11.5		72,373		10
	Wheaton Bank	77,177			13		59,354		10		71,097		13.6		52,450		10
	State Bank of the Lakes	73,248			11.9		61,698		10		71,178		11.5		61,886		10
	Old Plank Trail Bank	96,495			12.7		75,834		10		74,445		14.7		50,582		10
	St. Charles Bank	71,170			11.4		62,669		10		66,079		11.3		58,341		10
	Tier 1 Capital (to Risk Weighted Assets):
	Lake Forest Bank	$	222,577		11	%	$	121,466	6	%	$	209,699	10.2	%	$	123,113	6	%
	Hinsdale Bank	144,196			10.8		80,463		6		145,380		11.5		76,102		6
	North Shore Community Bank	162,903			8.1		120,484		6		145,488		8.3		105,675		6
	Libertyville Bank	103,895			10.6		58,666		6		105,251		10.8		58,728		6
	Barrington Bank	122,664			10.5		70,262		6		140,037		12.8		65,716		6
	Crystal Lake Bank	79,878			12.1		39,640		6		77,962		13.4		34,855		6
	Northbrook Bank	131,591			10.1		78,125		6		125,192		11		68,434		6
	Schaumburg Bank	64,263			10.3		37,278		6		62,538		10.8		34,768		6
	Village Bank	88,961			10.3		51,861		6		86,435		10.7		48,265		6
	Beverly Bank	65,385			10.3		37,951		6		59,440		10.7		33,418		6
	Town Bank	79,843			10.5		45,741		6		76,824		10.6		43,424		6
	Wheaton Bank	69,730			11.8		35,613		6		64,509		12.3		31,470		6
	State Bank of the Lakes	68,399			11.1		37,019		6		61,521		9.9		37,131		6
	Old Plank Trail Bank	92,694			12.2		45,500		6		66,170		13.1		30,349		6
	St. Charles Bank	64,922			10.4		37,601		6		60,753		10.4		35,004		6
	Tier 1 Leverage Ratio:
	Lake Forest Bank	$	222,577		9.6	%	$	116,340	5	%	$	209,699	8.8	%	$	119,601	5	%
	Hinsdale Bank	144,196			9.5		75,822		5		145,380		8.7		83,238		5
	North Shore Community Bank	162,903			7.2		113,580		5		145,488		7.2		101,553		5
	Libertyville Bank	103,895			9.2		56,703		5		105,251		8.9		59,379		5
	Barrington Bank	122,664			8.9		69,270		5		140,037		9.7		72,531		5
	Crystal Lake Bank	79,878			10.2		39,108		5		77,962		10.3		37,971		5
	Northbrook Bank	131,591			8.1		80,876		5		125,192		7.5		83,244		5
	Schaumburg Bank	64,263			9		35,571		5		62,538		8.7		36,061		5
	Village Bank	88,961			9.4		47,549		5		86,435		9		48,068		5
	Beverly Bank	65,385			8.8		37,281		5		59,440		12.3		24,127		5
	Town Bank	79,843			9.5		42,164		5		76,824		9.4		40,671		5
	Wheaton Bank	69,730			9.3		37,498		5		64,509		8.9		36,205		5
	State Bank of the Lakes	68,399			9.8		34,784		5		61,521		8.4		36,570		5
	Old Plank Trail Bank	92,694			8.7		53,603		5		66,170		8.9		37,380		5
	St. Charles Bank	64,922			9.6		33,975		5		60,753		9.4		32,170		5

Derivative_Financial_Instrumen1

Derivative Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Interest Rate Cap Derivative Summary	'
	Below is a summary of the interest rate cap derivatives held by the Company as of December 31, 2013:
	(Dollars in thousands)
			Notional			Accounting	Fair Value as of
	Effective Date	Maturity Date	Amount			Treatment	31-Dec-13
	30-Sep-11	30-Sep-14	$	20,000		Cash Flow Hedging	$	—
	30-Sep-11	30-Sep-14	40,000			Cash Flow Hedging	—
	3-May-12	3-May-15	77,000			Non-Hedge Designated	3
	3-May-12	3-May-16	215,000			Non-Hedge Designated	532
	1-Jun-12	1-Apr-15	96,530			Non-Hedge Designated	2
	29-Aug-12	29-Aug-16	216,500			Non-Hedge Designated	979
	22-Feb-13	22-Aug-16	100,000			Non-Hedge Designated	526
	21-Mar-13	21-Mar-17	100,000			Non-Hedge Designated	1,158
	16-May-13	16-Nov-16	75,000			Non-Hedge Designated	558
	15-Sep-13	15-Sep-17	50,000			Cash Flow Hedging	970
	30-Sep-13	30-Sep-17	40,000			Cash Flow Hedging	806
			$	1,030,030			$	5,534
Schedule of Fair Value of Derivative Financial Instruments	'
	The table below presents the fair value of the Company’s derivative financial instruments as of December 31, 2013 and December 31, 2012:
		Derivative Assets									Derivative Liabilities
		Fair Value									Fair Value
	(Dollars in thousands)		December 31, 2013				December 31, 2012					December 31, 2013				December 31, 2012
	Derivatives designated as hedging instruments under ASC 815:
	Interest rate derivatives designated as Cash Flow Hedges		$	1,776			$	2				$	3,160			$	7,988
	Interest rate derivatives designated as Fair Value Hedges		$	107			$	104				$	1			$	—
	Total derivatives designated as hedging instruments under ASC 815		$	1,883			$	106				$	3,161			$	7,988
	Derivatives not designated as hedging instruments under ASC 815:
	Interest rate derivatives		36,073				47,440					31,646				45,767
	Interest rate lock commitments		7,500				6,069					147				937
	Forward commitments to sell mortgage loans		2,761				277					2,310				3,057
	Foreign exchange contracts		4				14					—				2
	Total derivatives not designated as hedging instruments under ASC 815		$	46,338			$	53,800				$	34,103			$	49,763
	Total derivatives		$	48,221			$	53,906				$	37,264			$	57,751
Schedule of Cash Flow Hedging Instruments	'
	The table below provides details on each of these cash flow hedges as of December 31, 2013:
	(Dollars in thousands)		31-Dec-13
	Maturity Date		Notional				Fair Value
			Amount				Asset (Liability)
	Interest Rate Swaps:
	Sep-16		50,000				(2,083		)
	Oct-16		25,000				(1,077		)
	Total Interest Rate Swaps		75,000				(3,160		)
	Interest Rate Caps:
	Sep-14		20,000				—
	Sep-14		40,000				—
	Sep-17		50,000				970
	Sep-17		40,000				806
	Total Interest Rate Caps		150,000				1,776
	Total Cash Flow Hedges		$	225,000			$	(1,384	)
Rollforward of Amounts in Accumulated Other Comprehensive Income Related to Interest Rate Swaps Designated as Cash Flow Hedges	'
	A rollforward of the amounts in accumulated other comprehensive income related to interest rate derivatives designated as cash flow hedges follows:
			December 31,
	(Dollars in thousands)		2013				2012
	Unrealized loss at beginning of period		$	(8,673	)		$	(11,633	)
	Amount reclassified from accumulated other comprehensive income to interest expense on junior subordinated debentures		5,115				5,850
	Amount of loss recognized in other comprehensive income		(413		)		(2,890		)
	Unrealized loss at end of period		$	(3,971	)		$	(8,673	)
Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]	'
	The following table presents the gain/(loss) and hedge ineffectiveness recognized on derivative instruments and the related hedged items that are designated as a fair value hedge accounting relationship as of December 31, 2013 and 2012:
	(Dollars in thousands)	Location of Gain or (Loss)		Amount of Gain or (Loss) Recognized							Amount of Gain or (Loss) Recognized							Income Statement Gain/
		Recognized in Income on		in Income on Derivative							in Income on Hedged Item							(Loss) due to Hedge
		Derivative		Year Ended December 31,							Year Ended December 31,							Ineffectiveness
																		Year Ended December 31,
	Derivatives in Fair Value
	Hedging Relationships			2013				2012			2013				2012			2013		2012
	Interest rate products	Other income		$	67			(480	)		$	(55	)		535			$	12	55
Summary Amounts Included in Consolidated Statement of Income Related to Derivatives	'
	Amounts included in the Consolidated Statements of Income related to derivative instruments not designated in hedge relationships were as follows:
	(Dollars in thousands)				December 31,
	Derivative		Location in income statement		2013				2012
	Interest rate swaps and caps		Other income		$	853			$	(1,974	)
	Mortgage banking derivatives		Mortgage banking revenue		6,026				1,659
	Covered call options		Fees from covered call options		4,773				10,476
	Foreign exchange contracts		Other income		(11		)		12
Derivative Asset and Liability Balance Sheet Offsetting [Table Text Block]	'
	The Company records interest rate derivatives subject to master netting agreements at their gross value and does not offset derivative assets and liabilities on the Consolidated Statements of Condition. The tables below summarize the Company's interest rate derivatives and offsetting positions as of the dates shown.
		Derivative Assets								Derivative Liabilities
		Fair Value								Fair Value
	(Dollars in thousands)	31-Dec-13				31-Dec-12				31-Dec-13				31-Dec-12
	Gross Amounts Recognized	$	37,956			$	47,546			$	34,807			$	53,755
	Less: Amounts offset in the Statements of Condition	$	—			$	—			$	—			$	—
	Net amount presented in the Statements of Condition	$	37,956			$	47,546			$	34,807			$	53,755
	Gross amounts not offset in the Statements of Condition
	Offsetting Derivative Positions	(8,826		)		(339		)		(8,826		)		(339		)
	Securities Collateral Posted (1)	—				—				(25,981		)		(46,811		)
	Cash Collateral Posted	—				—				—				(6,605		)
	Net Credit Exposure	$	29,130			$	47,207			$	—			$	—
	(1) As of December 31, 2013 and 2012, the Company posted securities collateral of $34.6 million and $49.9 million, respectively which resulted in excess collateral with its counterparties. For purposes of this disclosure, the amount of posted collateral is limited to the amount offsetting the derivative liability.

Fair_Value_of_Assets_and_Liabi1

Fair Value of Assets and Liabilities (Tables)	12 Months Ended
	Dec. 31, 2013
Fair Value Disclosures [Abstract]	'
Summary of Balances of Assets and Liabilities Measured at Fair Value on a Recurring Basis	'
	The following tables present the balances of assets and liabilities measured at fair value on a recurring basis for the periods presented:
			31-Dec-13
	(Dollars in thousands)		Total			Level 1			Level 2			Level 3
	Available-for-sale securities
	U.S. Treasury		$	336,095		$	—		$	336,095		$	—
	U.S. Government agencies		895,688			—			895,688			—
	Municipal		152,716			—			116,330			36,386
	Corporate notes		135,038			—			135,038			—
	Mortgage-backed		605,225			—			605,225			—
	Equity securities		51,528			—			29,365			22,163
	Trading account securities		497			—			497			—
	Mortgage loans held-for-sale		332,485			—			332,485			—
	Mortgage servicing rights		8,946			—			—			8,946
	Nonqualified deferred compensations assets		7,222			—			7,222			—
	Derivative assets		48,221			—			48,221			—
	Total		$	2,573,661		$	—		$	2,506,166		$	67,495
	Derivative liabilities		$	37,264		$	—		$	37,264		$	—
			31-Dec-12
	(Dollars in thousands)		Total			Level 1			Level 2			Level 3
	Available-for-sale securities
	U.S. Treasury		$	219,487		$	—		$	219,487		$	—
	U.S. Government agencies		990,039			—			990,039			—
	Municipal		110,471			—			79,701			30,770
	Corporate notes		154,806			—			154,806			—
	Mortgage-backed		271,574			—			271,574			—
	Equity securities		49,699			—			27,530			22,169
	Trading account securities		583			—			583			—
	Mortgage loans held-for-sale		385,033			—			385,033			—
	Mortgage servicing rights		6,750			—			—			6,750
	Nonqualified deferred compensations assets		5,532			—			5,532			—
	Derivative assets		53,906			—			53,906			—
	Total		$	2,247,880		$	—		$	2,188,191		$	59,689
	Derivative liabilities		$	57,751		$	—		$	57,751		$	—
Summary of Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis	'
	The changes in Level 3 assets measured at fair value on a recurring basis during the year ended December 31, 2013 are summarized as follows:
					Equity securities			Mortgage
	(Dollars in thousands)	Municipal						servicing rights
	Balance at January 1, 2013	$	30,770		$	22,169		$	6,750
	Total net (losses) gains included in:
	Net income (1)	—			(3,328		)	2,196
	Other comprehensive (loss) income	(296		)	3,322			—
	Purchases	22,209			—			—
	Issuances	—			—			—
	Sales	—			—			—
	Settlements	(16,297		)	—			—
	Net transfers into/out of Level 3	—			—			—
	Balance at December 31, 2013	$	36,386		$	22,163		$	8,946
	-1	Changes in the balance of mortgage servicing rights are recorded as a component of mortgage banking revenue in non-interest income.
	The changes in Level 3 assets measured at fair value on a recurring basis during the year ended December 31, 2012 are summarized as follows:
	(Dollars in thousands)	Municipal			Equity securities			Mortgage servicing rights
	Balance at January 1, 2012	$	24,211		$	18,971		$	6,700
	Total net gains included in:
	Net income (1)	—			—			50
	Other comprehensive income	27			3,198			—
	Purchases	20,967			—			—
	Issuances	—			—			—
	Sales	—			—			—
	Settlements	(12,033		)	—			—
	Net transfers out of Level 3 (2)	(2,402		)	—			—
	Balance at December 31, 2012	$	30,770		$	22,169		$	6,750
	-1	Changes in the balance of mortgage servicing rights are recorded as a component of mortgage banking revenue in non-interest income.
	-2	During the first quarter of 2012, one municipal security was transferred out of Level 3 into Level 2 as observable market information was available that market participants would use in pricing these securities. Transfers out of Level 3 are recognized at the end of the reporting period.
Summary of Assets Measured at Fair Value on a Nonrecurring Basis	'
	For assets measured at fair value on a nonrecurring basis that were still held in the balance sheet at the end of the period, the following table provides the carrying value of the related individual assets or portfolios at December 31, 2013.
			December 31, 2013											Twelve Months
														Ended
														December 31,
														2013
														Fair Value
														Losses
	(Dollars in thousands)		Total			Level 1			Level 2			Level 3		Recognized
	Impaired loans-collateral based		$	55,127		$	—		$	—		$	55,127	$	38,430
	Other real estate owned, including covered other real estate owned (1)		136,288			—			—			136,288		10,924
	Mortgage loans held-for-sale, at lower of cost or market		1,842			—			1,842			—		—
	Total		$	193,257		$	—		$	1,842		$	191,415	$	49,354
Schedule of Valuation Techniques and Significant Unobservable Inputs Used to Measure Both Recurring and Nonrecurring	'
	The valuation techniques and significant unobservable inputs used to measure both recurring and non-recurring Level 3 fair value measurements at December 31, 2013 were as follows:
	(Dollars in thousands)
		Fair Value			Valuation Methodology		Significant Unobservable Input	Range		Weighted	Impact to valuation
								of Inputs		Average	from an increased or
										of Inputs	higher input value
	Measured at fair value on a recurring basis:
	Municipal Securities	$	36,386		Bond pricing		Equivalent rating	BBB-AA+		N/A	Increase
	Other Equity Securities	22,163			Discounted cash flows		Discount rate	1.94%-3.06%		2.54%	Decrease
	Mortgage Servicing Rights	8,946			Discounted cash flows		Discount rate	10%-13.5%		10.16%	Decrease
							Constant prepayment rate (CPR)	10%-15%		11.94%	Decrease
	Measured at fair value on a non-recurring basis:
	Impaired loans—collateral based	55,127			Appraisal value		N/A	N/A		N/A	N/A
	Other real estate owned	136,288			Appraisal value		Property specific impairment adjustment	0%-100%		2.94%	Decrease
Summary of Carrying Amounts and Estimated Fair Values of Financial Instruments	'
	The Company is required under applicable accounting guidance to report the fair value of all financial instruments on the consolidated statements of condition, including those financial instruments carried at cost. The carrying amounts and estimated fair values of the Company’s financial instruments as of the dates shown:
			31-Dec-13						31-Dec-12
	(Dollars in thousands)		Carrying			Fair			Carrying			Fair
			Value			Value			Value			Value
	Financial Assets:
	Cash and cash equivalents		$	263,864		$	263,864		$	315,028		$	315,028
	Interest bearing deposits with banks		495,574			495,574			1,035,743			1,035,743
	Available-for-sale securities		2,176,290			2,176,290			1,796,076			1,796,076
	Trading account securities		497			497			583			583
	Brokerage customer receivables		30,953			30,953			24,864			24,864
	Federal Home Loan Bank and Federal Reserve Bank stock, at cost		79,261			79,261			79,564			79,564
	Mortgage loans held-for-sale, at fair value		332,485			332,485			385,033			385,033
	Mortgage loans held-for-sale, at lower of cost or market		1,842			1,857			27,167			27,568
	Total loans		13,243,033			13,867,255			12,389,030			13,053,101
	Mortgage servicing rights		8,946			8,946			6,750			6,750
	Nonqualified deferred compensation assets		7,222			7,222			5,532			5,532
	Derivative assets		48,221			48,221			53,906			53,906
	FDIC indemnification asset		85,672			85,672			208,160			208,160
	Accrued interest receivable and other		163,732			163,732			157,157			157,157
	Total financial assets		$	16,937,592		$	17,561,829		$	16,484,593		$	17,149,065
	Financial Liabilities
	Non-maturity deposits		$	10,442,077		$	10,442,077		$	9,447,633		$	9,447,633
	Deposits with stated maturities		4,226,712			4,242,172			4,980,911			5,013,757
	Notes payable		364			364			2,093			2,093
	Federal Home Loan Bank advances		417,762			422,750			414,122			425,431
	Subordinated notes		—			—			15,000			15,000
	Other borrowings		254,740			254,740			274,411			274,411
	Junior subordinated debentures		249,493			250,672			249,493			250,428
	Derivative liabilities		37,264			37,264			57,751			57,751
	Accrued interest payable and other		8,556			8,556			11,589			11,589
	Total financial liabilities		$	15,636,968		$	15,658,595		$	15,453,003		$	15,498,093

Shareholders_Equity_Tables

Shareholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2013
Stockholders' Equity Note [Abstract]	'
Summary of the Company's Common and Preferred Stock	'
	A summary of the Company’s common and preferred stock at December 31, 2013 and 2012 is as follows:
			2013			2012
	Common Stock:
	Shares authorized		100,000,000			100,000,000
	Shares issued		46,181,588			37,107,684
	Shares outstanding		46,116,583			36,858,355
	Cash dividend per share		$	0.18		$	0.18
	Preferred Stock:
	Shares authorized		20,000,000			20,000,000
	Shares issued		126,477			176,500
	Shares outstanding		126,477			176,500
Aggregate Fair Values Assigned to Each Component of Tangible Equity Units Offering	'
	The aggregate fair values assigned to each component of the TEU offering were as follows:
	(Dollars and units in thousands, except unit price)		Equity			Debt			TEU
			Component			Component			Total
	Units issued (1)		4,600			4,600			4,600
	Unit price		$	40.271818		$	9.728182		$	50
	Gross proceeds		185,250			44,750			230,000
	Issuance costs, including discount		5,934			1,419			7,353
	Net proceeds		$	179,316		$	43,331		$	222,647
	Balance sheet impact
	Other borrowings		—			43,331			43,331
	Surplus		179,316			—			179,316
	-1	TEUs consisted of two components: one unit of the equity component and one unit of the debt component.
Components of Other Comprehensive Income (Loss), Including the Related Income Tax Effects	'
	The following tables summarize the components of other comprehensive income (loss), including the related income tax effects, for the years ending December 31, 2013, 2012 and 2011:
	(In thousands)		Accumulated			Accumulated			Accumulated			Total
			Unrealized			Unrealized			Foreign			Accumulated
			Gains			(Losses) Gains on			Currency			Other
			(Losses) on			Derivative			Translation			Comprehensive
			Securities			Instruments			Adjustments			Income (Loss)
	Balance at January 1, 2013		$	6,710		$	(5,292	)	$	6,293		$	7,711
	Other comprehensive loss during the period, net of tax, before reclassification		(62,182		)	(251		)	(13,202		)	(75,635		)
	Amount reclassified from accumulated other comprehensive income, net of tax		$	1,807		$	3,081		$	—		$	4,888
	Net other comprehensive (loss) income during the period, net of tax		$	(60,375	)	$	2,830		$	(13,202	)	$	(70,747	)
	Balance at December 31, 2013		$	(53,665	)	$	(2,462	)	$	(6,909	)	$	(63,036	)
	Balance at January 1, 2012		$	4,204		$	(7,082	)	$	—		$	(2,878	)
	Other comprehensive income (loss) during the period, net of tax, before reclassification		5,461			(1,713		)	6,293			10,041
	Amount reclassified from accumulated other comprehensive (loss) income, net of tax		(2,955		)	3,503			—			548
	Net other comprehensive income during the period, net of tax		$	2,506		$	1,790		$	6,293		$	10,589
	Balance at December 31, 2012		$	6,710		$	(5,292	)	$	6,293		$	7,711
	Balance at January 1, 2011		$	2,679		$	(8,191	)	$	—		$	(5,512	)
	Other comprehensive income (loss) during the period, net of tax, before reclassifications		2,605			(3,818		)	—			(1,213		)
	Amount reclassified from accumulated other comprehensive (loss) income, net of tax		(1,080		)	4,927			—			3,847
	Net other comprehensive income during the period, net of tax		$	1,525		$	1,109		$	—		$	2,634
	Balance at December 31, 2011		$	4,204		$	(7,082	)	$	—		$	(2,878	)
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]	'
			Amount Reclassified from Accumulated Other Comprehensive Income for the Year Ended,
	Details Regarding the Component of Accumulated Other Comprehensive Income		December 31,						Impacted Line on the Consolidated Statements of Income
			2013			2012
	Accumulated unrealized gains (losses) on securities
	(Losses) gains included in net income		$	(3,000	)	$	4,895		(Losses) gains on available-for-sale securities, net
			(3,000		)	4,895			Income before taxes
	Tax effect		$	1,193		$	(1,940	)	Income tax expense
	Net of tax		$	(1,807	)	$	2,955		Net income
	Accumulated unrealized (losses) gains on derivative instruments
	Amount reclassified to interest expense on junior subordinated debentures		$	5,116		$	5,850		Interest on junior subordinated debentures
			(5,116		)	(5,850		)	Income before taxes
	Tax effect		$	2,035		$	2,347		Income tax expense
	Net of tax		$	(3,081	)	$	(3,503	)	Net income

Segment_Information_Tables

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2013
Segment Reporting [Abstract]	'
Summary of Certain Operating Information for Reportable Segments	'
	The following is a summary of certain operating information for reportable segments:
	(Dollars in thousands)	Community		Specialty		Wealth	Total Operating Segments	Intersegment Eliminations		Consolidated
		Banking		Finance		Management
	2013
	Net interest income	$	448,173	73,903		14,118	536,194	14,433		550,627
	Provision for credit losses	45,396		637		—	46,033	—		46,033
	Non-interest income	150,543		30,890		65,597	247,030	(24,633	)	222,397
	Non-interest expense	409,780		40,529		62,442	512,751	(10,200	)	502,551
	Income tax expense	55,161		25,508		6,561	87,230	—		87,230
	Net income	$	88,379	38,119		10,712	137,210	—		137,210
	Total assets at end of year	$	15,132,912	2,470,832		494,039	18,097,783	—		18,097,783
	2012						—	—		—
	Net interest income	$	430,405	64,048		12,324	506,777	12,739		519,516
	Provision for credit losses	74,975		1,461		—	76,436	—		76,436
	Non-interest income	166,296		26,845		54,519	247,660	(21,568	)	226,092
	Non-interest expense	403,228		38,394		56,247	497,869	(8,829	)	489,040
	Income tax expense	45,170		19,660		4,106	68,936	—		68,936
	Net income	$	73,328	31,378		6,490	111,196	—		111,196
	Total assets at end of year	$	14,787,221	2,295,284		437,108	17,519,613	—		17,519,613
	2011						—			—
	Net interest income	$	370,733	72,893		11,228	454,854	6,523		461,377
	Provision for credit losses	102,902		(264	)	—	102,638	—		102,638
	Non-interest income	139,248		15,133		47,755	202,136	(12,438	)	189,698
	Non-interest expense	342,283		32,829		51,207	426,319	(5,915	)	420,404
	Income tax expense	24,681		22,511		3,266	50,458	—		50,458
	Net income	$	40,115	32,950		4,510	77,575	—		77,575
	Total assets at end of year	$	13,286,432	2,185,214		422,162	15,893,808	—		15,893,808

Condensed_Parent_Company_Finan1

Condensed Parent Company Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2013
Condensed Financial Information of Parent Company Only Disclosure [Abstract]	'
Balance Sheets	'
	Condensed parent company only financial statements of Wintrust follow:
	Statement of Financial Condition
		December 31,
	(In thousands)	2013			2012
	Assets
	Cash	$	80,869		$	55,011
	Available-for-sale securities, at fair value	12,839			9,647
	Investment in and receivable from subsidiaries	1,971,018			1,935,556
	Loans, net of unearned income	3,768			1,760
	Less: Allowance for loan losses	81			—
	Net Loans	3,687			1,760
	Goodwill	8,371			8,347
	Other assets	113,930			111,786
	Total assets	$	2,190,714		$	2,122,107
	Liabilities and Shareholders’ Equity
	Other liabilities	$	21,292		$	15,899
	Notes payable	—			1,000
	Subordinated notes	—			15,000
	Other borrowings	19,340			36,010
	Junior subordinated debentures	249,493			249,493
	Shareholders’ equity	1,900,589			1,804,705
	Total liabilities and shareholders’ equity	$	2,190,714		$	2,122,107
Statements of Income	'
	Statements of Income
		Years Ended December 31,
	(In thousands)	2013			2012			2011
	Income
	Dividends and interest from subsidiaries	$	114,241		$	47,295		$	30,783
	Gains on available-for-sale securities, net	111			64			164
	Other income	4,529			605			(487		)
	Total income	118,881			47,964			30,460
	Expenses
	Interest expense	13,424			16,840			21,342
	Salaries and employee benefits	17,831			20,042			12,435
	Other expenses	24,739			27,428			14,037
	Total expenses	55,994			64,310			47,814
	Income (loss) before income taxes and equity in undistributed loss of subsidiaries	62,887			(16,346		)	(17,354		)
	Income tax benefit	18,599			23,127			16,573
	Income (loss) before equity in undistributed net income of subsidiaries	81,486			6,781			(781		)
	Equity in undistributed net income of subsidiaries	55,724			104,415			78,356
	Net income	$	137,210		$	111,196		$	77,575
Statements of Cash Flows	'
	Condensed Parent Company Financial Statements
	Condensed parent company only financial statements of Wintrust follow:
	Statement of Financial Condition
		December 31,
	(In thousands)	2013			2012
	Assets
	Cash	$	80,869		$	55,011
	Available-for-sale securities, at fair value	12,839			9,647
	Investment in and receivable from subsidiaries	1,971,018			1,935,556
	Loans, net of unearned income	3,768			1,760
	Less: Allowance for loan losses	81			—
	Net Loans	3,687			1,760
	Goodwill	8,371			8,347
	Other assets	113,930			111,786
	Total assets	$	2,190,714		$	2,122,107
	Liabilities and Shareholders’ Equity
	Other liabilities	$	21,292		$	15,899
	Notes payable	—			1,000
	Subordinated notes	—			15,000
	Other borrowings	19,340			36,010
	Junior subordinated debentures	249,493			249,493
	Shareholders’ equity	1,900,589			1,804,705
	Total liabilities and shareholders’ equity	$	2,190,714		$	2,122,107
	Statements of Income
		Years Ended December 31,
	(In thousands)	2013			2012			2011
	Income
	Dividends and interest from subsidiaries	$	114,241		$	47,295		$	30,783
	Gains on available-for-sale securities, net	111			64			164
	Other income	4,529			605			(487		)
	Total income	118,881			47,964			30,460
	Expenses
	Interest expense	13,424			16,840			21,342
	Salaries and employee benefits	17,831			20,042			12,435
	Other expenses	24,739			27,428			14,037
	Total expenses	55,994			64,310			47,814
	Income (loss) before income taxes and equity in undistributed loss of subsidiaries	62,887			(16,346		)	(17,354		)
	Income tax benefit	18,599			23,127			16,573
	Income (loss) before equity in undistributed net income of subsidiaries	81,486			6,781			(781		)
	Equity in undistributed net income of subsidiaries	55,724			104,415			78,356
	Net income	$	137,210		$	111,196		$	77,575
	Statements of Cash Flows
		Years Ended December 31,
	(In thousands)	2013			2012			2011
	Operating Activities:
	Net income	$	137,210		$	111,196		$	77,575
	Adjustments to reconcile net income to net cash provided by (used for) operating activities
	Provision for credit losses	1,765			8,050			608
	Gains on available-for-sale securities, net	(111		)	(64		)	(164		)
	Depreciation and amortization	3,744			3,072			2,178
	Deferred income tax expense (benefit)	1,217			2,224			(1,785		)
	Stock-based compensation expense	6,799			9,072			2,008
	Tax (expense) benefit from stock-based compensation arrangements	(831		)	1,392			129
	Excess tax benefits from stock-based compensation arrangements	(112		)	(483		)	(19		)
	Increase in other assets	(3,051		)	(53,892		)	(28,389		)
	(Decrease) increase in other liabilities	(4,517		)	(1,619		)	122
	Equity in undistributed net income of subsidiaries	(55,724		)	(104,415		)	(78,356		)
	Net Cash Provided by (Used for) Operating Activities	86,389			(25,467		)	(26,093		)
	Investing Activities:
	Capital contributions to subsidiaries, net	(8,293		)	(53,807		)	(22,361		)
	Other investing activity, net	(21,206		)	(12,284		)	440
	Net Cash Used for Investing Activities	(29,499		)	(66,091		)	(21,921		)
	Financing Activities:
(Decrease) increase in notes payable and other borrowings, net	(17,860		)	(44,887		)	36,337
Repayment of subordinated note	(15,000		)	(20,000		)	(15,000		)
Excess tax benefits from stock-based compensation arrangements	112			483			19
Net proceeds from issuance of Series C preferred stock	—			122,690			—
Issuance of common shares resulting from exercise of stock options, employee stock purchase plan and conversion of common stock warrants	19,113			14,891			3,586
Dividends paid	(13,893		)	(13,157		)	(10,344		)
Common stock repurchases	(3,504		)	(7,726		)	(112		)
Net Cash (Used For) Provided by Financing Activities	(31,032		)	52,294			14,486
Net Increase (Decrease) in Cash and Cash Equivalents	25,858			(39,264		)	(33,528		)
Cash and Cash Equivalents at Beginning of Year	55,011			94,275			127,803
Cash and Cash Equivalents at End of Year	$	80,869		$	55,011		$	94,275
Statements of Cash Flows
	Years Ended December 31,
(In thousands)	2013			2012			2011
Operating Activities:
Net income	$	137,210		$	111,196		$	77,575
Adjustments to reconcile net income to net cash provided by (used for) operating activities
Provision for credit losses	1,765			8,050			608
Gains on available-for-sale securities, net	(111		)	(64		)	(164		)
Depreciation and amortization	3,744			3,072			2,178
Deferred income tax expense (benefit)	1,217			2,224			(1,785		)
Stock-based compensation expense	6,799			9,072			2,008
Tax (expense) benefit from stock-based compensation arrangements	(831		)	1,392			129
Excess tax benefits from stock-based compensation arrangements	(112		)	(483		)	(19		)
Increase in other assets	(3,051		)	(53,892		)	(28,389		)
(Decrease) increase in other liabilities	(4,517		)	(1,619		)	122
Equity in undistributed net income of subsidiaries	(55,724		)	(104,415		)	(78,356		)
Net Cash Provided by (Used for) Operating Activities	86,389			(25,467		)	(26,093		)
Investing Activities:
Capital contributions to subsidiaries, net	(8,293		)	(53,807		)	(22,361		)
Other investing activity, net	(21,206		)	(12,284		)	440
Net Cash Used for Investing Activities	(29,499		)	(66,091		)	(21,921		)
Financing Activities:
(Decrease) increase in notes payable and other borrowings, net	(17,860		)	(44,887		)	36,337
Repayment of subordinated note	(15,000		)	(20,000		)	(15,000		)
Excess tax benefits from stock-based compensation arrangements	112			483			19
Net proceeds from issuance of Series C preferred stock	—			122,690			—
Issuance of common shares resulting from exercise of stock options, employee stock purchase plan and conversion of common stock warrants	19,113			14,891			3,586
Dividends paid	(13,893		)	(13,157		)	(10,344		)
Common stock repurchases	(3,504		)	(7,726		)	(112		)
Net Cash (Used For) Provided by Financing Activities	(31,032		)	52,294			14,486
Net Increase (Decrease) in Cash and Cash Equivalents	25,858			(39,264		)	(33,528		)
Cash and Cash Equivalents at Beginning of Year	55,011			94,275			127,803
Cash and Cash Equivalents at End of Year	$	80,869		$	55,011		$	94,275

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2013
Earnings Per Share [Abstract]	'
Computation of Basic and Diluted Earnings Per Common Share	'
	The following table sets forth the computation of basic and diluted earnings per common share for 2013 , 2012 and 2011:
	(In thousands, except per share data)		2013		2012		2011
	Net income		$	137,210	$	111,196	$	77,575
	Less: Preferred stock dividends and discount accretion		8,395		9,093		4,128
	Net income applicable to common shares—Basic	(A)	128,815		102,103		73,447
	Add: Dividends on convertible preferred stock		8,325		8,955		—
	Net income applicable to common shares—Diluted	(B)	137,140		111,058		73,447
	Weighted average common shares outstanding	(C)	38,699		36,365		35,355
	Effect of dilutive potential common shares:
	Common stock equivalents		7,108		7,313		8,636
	Convertible preferred stock, if dilutive		4,141		4,356		—
	Total dilutive potential common shares		11,249		11,669		8,636
	Weighted average common shares and effect of dilutive potential common shares	(D)	49,948		48,034		43,991
	Net income per common share:
	Basic	(A/C)	$	3.33	$	2.81	$	2.08
	Diluted	(B/D)	$	2.75	$	2.31	$	1.67

Quarterly_Financial_Summary_Un1

Quarterly Financial Summary (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]	'
Summary of Quarterly Financial Information	'
	The following is a summary of quarterly financial information for the years ended December 31, 2013 and 2012:
		2013 Quarters						2012 Quarters
	(In thousands, except per share data)	First		Second	Third	Fourth		First		Second	Third	Fourth
	Interest income	$	152,313	156,646	161,168	160,582		$	156,486	155,691	158,201	156,643
	Interest expense	21,600		20,822	19,386	18,274		30,591		27,421	25,626	23,867
	Net interest income	130,713		135,824	141,782	142,308		125,895		128,270	132,575	132,776
	Provision for credit losses	15,687		15,382	11,114	3,850		17,400		20,691	18,799	19,546
	Net interest income after provision for credit losses	115,026		120,442	130,668	138,458		108,495		107,579	113,776	113,230
	Non-interest income, excluding net securities gains (losses)	57,128		63,993	54,587	49,689		46,207		49,826	62,536	62,628
	Net securities gains (losses)	251		2	75	(3,328	)	816		1,109	409	2,561
	Non-interest expense	120,119		128,187	127,248	126,997		117,759		117,185	124,548	129,548
	Income before income taxes	52,286		56,250	58,082	57,822		37,759		41,329	52,173	48,871
	Income tax expense	20,234		21,943	22,519	22,534		14,549		15,734	19,871	18,782
	Net income	$	32,052	34,307	35,563	35,288		$	23,210	25,595	32,302	30,089
	Preferred stock dividends and discount accretion	2,616		2,617	1,581	1,581		1,246		2,644	2,616	2,616
	Net income applicable to common shares	$	29,436	31,690	33,982	33,707		$	21,964	22,951	29,686	27,473
	Net income per common share:
	Basic	0.8		0.85	0.86	0.82		0.61		0.63	0.82	0.75
	Diluted	0.65		0.69	0.71	0.7		0.5		0.52	0.66	0.61
	Cash dividends declared per common share	0.09		—	0.09	—		0.09		—	0.09	—

Summary_Of_Significant_Account2

Summary Of Significant Accounting Policies (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013
In Millions, unless otherwise specified			Land Improvements [Member]	Minimum [Member]	Minimum [Member]	Minimum [Member]	Minimum [Member]	Maximum [Member]	Maximum [Member]	Maximum [Member]	Maximum [Member]
					Furniture, Fixtures and Equipment [Member]	Software and Computer-Related Equipment [Member]	Buildings and Improvements [Member]		Furniture, Fixtures and Equipment [Member]	Software and Computer-Related Equipment [Member]	Buildings and Improvements [Member]
Premises and equipment, useful lives	'	'	'15 years	'	'2 years	'2 years	'7 years	'	'10 years	'5 years	'39 years
Finite-lived intangibles, useful life	'	'	'	'	'	'	'	'20 years	'	'	'
Bank-owned life insurance	$118.50	$104.60	'	'	'	'	'	'	'	'	'
Tax benefit realized on settlement, percentage	'	'	'	50.00%	'	'	'	'	'	'	'

AvailableForSale_Securities_Su

Available-For-Sale Securities (Summary of the Available-for-Sale Securities Portfolio) (Details) (USD $)	Dec. 31, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'		'
Amortized Cost	$2,265,118		$1,785,113
Gross unrealized gains	11,758		20,556
Gross unrealized losses	-100,586		-9,593
Total available-for-sale securities, fair value	2,176,290		1,796,076
U.S. Treasury [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Amortized Cost	354,262		220,226
Gross unrealized gains	141		198
Gross unrealized losses	-18,308		-937
Total available-for-sale securities, fair value	336,095		219,487
U.S. Government Agencies [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Amortized Cost	950,086		986,186
Gross unrealized gains	1,680		4,839
Gross unrealized losses	-56,078		-986
Total available-for-sale securities, fair value	895,688		990,039
Municipal [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Amortized Cost	154,463		107,868
Gross unrealized gains	2,551		2,899
Gross unrealized losses	-4,298		-296
Total available-for-sale securities, fair value	152,716		110,471
Corporate Notes, Financial Issuers [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Amortized Cost	129,362		142,205
Gross unrealized gains	1,993		2,452
Gross unrealized losses	-2,411		-3,982
Total available-for-sale securities, fair value	128,944		140,675
Corporate Notes, Other [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Amortized Cost	5,994		13,911
Gross unrealized gains	105		220
Gross unrealized losses	-5		0
Total available-for-sale securities, fair value	6,094		14,131
Mortgage-Backed Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Amortized Cost	562,708	[1]	188,485	[1]
Gross unrealized gains	3,537	[1]	8,805	[1]
Gross unrealized losses	-18,047	[1]	-30	[1]
Total available-for-sale securities, fair value	548,198	[1]	197,260	[1]
Mortgage-Backed, Collateralized Mortgage Obligations [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Amortized Cost	57,711	[1]	73,386	[1]
Gross unrealized gains	258	[1]	928	[1]
Gross unrealized losses	-942	[1]	0	[1]
Total available-for-sale securities, fair value	57,027	[1]	74,314	[1]
Equity Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Amortized Cost	50,532		52,846
Gross unrealized gains	1,493		215
Gross unrealized losses	-497		-3,362
Total available-for-sale securities, fair value	$51,528		$49,699
[1]	Consisting entirely of residential mortgage-backed securities, none of which are subprime.

AvailableForSale_Securities_Sc

Available-For-Sale Securities (Schedule of Available-for-Sale Securities Portfolio Continuous Unrealized Loss Position) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Continuous unrealized losses existing for less than 12 months, Fair value	$883,579	$457,242
Continuous unrealized losses existing for less than 12 months, Unrealized losses	-70,888	-2,301
Continuous unrealized losses existing for greater than 12 months, Fair value	321,347	114,560
Continuous unrealized losses existing for greater than 12 months, Unrealized losses	-29,698	-7,292
Total, Fair value	1,204,926	571,802
Total, Unrealized losses	-100,586	-9,593
US Treasury Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Continuous unrealized losses existing for less than 12 months, Fair value	75,695	199,250
Continuous unrealized losses existing for less than 12 months, Unrealized losses	-62	-937
Continuous unrealized losses existing for greater than 12 months, Fair value	181,922	0
Continuous unrealized losses existing for greater than 12 months, Unrealized losses	-18,246	0
Total, Fair value	257,617	199,250
Total, Unrealized losses	-18,308	-937
U.S. Government Agencies [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Continuous unrealized losses existing for less than 12 months, Fair value	399,982	200,408
Continuous unrealized losses existing for less than 12 months, Unrealized losses	-47,860	-986
Continuous unrealized losses existing for greater than 12 months, Fair value	53,431	0
Continuous unrealized losses existing for greater than 12 months, Unrealized losses	-8,218	0
Total, Fair value	453,413	200,408
Total, Unrealized losses	-56,078	-986
Municipal [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Continuous unrealized losses existing for less than 12 months, Fair value	66,368	26,782
Continuous unrealized losses existing for less than 12 months, Unrealized losses	-3,757	-295
Continuous unrealized losses existing for greater than 12 months, Fair value	10,529	512
Continuous unrealized losses existing for greater than 12 months, Unrealized losses	-541	-1
Total, Fair value	76,897	27,294
Total, Unrealized losses	-4,298	-296
Corporate Notes, Financial Issuers [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Continuous unrealized losses existing for less than 12 months, Fair value	21,296	4,644
Continuous unrealized losses existing for less than 12 months, Unrealized losses	-49	-13
Continuous unrealized losses existing for greater than 12 months, Fair value	66,834	91,970
Continuous unrealized losses existing for greater than 12 months, Unrealized losses	-2,362	-3,969
Total, Fair value	88,130	96,614
Total, Unrealized losses	-2,411	-3,982
Corporate Notes, Other [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Continuous unrealized losses existing for less than 12 months, Fair value	995	0
Continuous unrealized losses existing for less than 12 months, Unrealized losses	-5	0
Continuous unrealized losses existing for greater than 12 months, Fair value	0	0
Continuous unrealized losses existing for greater than 12 months, Unrealized losses	0	0
Total, Fair value	995	0
Total, Unrealized losses	-5	0
Mortgage-Backed Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Continuous unrealized losses existing for less than 12 months, Fair value	270,522	20,198
Continuous unrealized losses existing for less than 12 months, Unrealized losses	-18,008	-30
Continuous unrealized losses existing for greater than 12 months, Fair value	2,922	0
Continuous unrealized losses existing for greater than 12 months, Unrealized losses	-39	0
Total, Fair value	273,444	20,198
Total, Unrealized losses	-18,047	-30
Mortgage-Backed, Collateralized Mortgage Obligations [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Continuous unrealized losses existing for less than 12 months, Fair value	40,449	0
Continuous unrealized losses existing for less than 12 months, Unrealized losses	-942	0
Continuous unrealized losses existing for greater than 12 months, Fair value	0	0
Continuous unrealized losses existing for greater than 12 months, Unrealized losses	0	0
Total, Fair value	40,449	0
Total, Unrealized losses	-942	0
Equity Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Continuous unrealized losses existing for less than 12 months, Fair value	8,272	5,960
Continuous unrealized losses existing for less than 12 months, Unrealized losses	-205	-40
Continuous unrealized losses existing for greater than 12 months, Fair value	5,709	22,078
Continuous unrealized losses existing for greater than 12 months, Unrealized losses	-292	-3,322
Total, Fair value	13,981	28,038
Total, Unrealized losses	($497)	($3,362)

AvailableForSale_Securities_Sc1

Available-For-Sale Securities (Schedule of Available-for-Sale Investment Securities Gross Gains and Gross Losses Realized) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Available-for-sale Securities [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Realized gains	'	'	'	'	'	'	'	'	$434	$4,918	$1,874
Realized losses	'	'	'	'	'	'	'	'	-106	-23	-82
Net realized gains	'	'	'	'	'	'	'	'	328	4,895	1,792
Other than temporary impairment charges	'	'	'	'	'	'	'	'	-3,328	0	0
(Losses) gains on available-for-sale securities, net	-3,328	75	2	251	2,561	409	1,109	816	-3,000	4,895	1,792
Proceeds from sales of available-for-sale securities, net	'	'	'	'	'	'	'	'	$138,274	$2,399,035	$1,265,046

AvailableForSale_Securities_Co

Available-For-Sale Securities (Contractual Maturities of Available-for-Sale Securities) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Due in one year or less, Amortized Cost	$268,847	$188,594
Due in one year or less, Fair Value	269,168	189,015
Due in one to five years, Amortized Cost	358,108	419,588
Due in one to five years, Fair Value	358,357	419,654
Due in five to ten years, Amortized Cost	350,372	361,037
Due in five to ten years, Fair Value	330,020	362,135
Due after ten years, Amortized Cost	616,840	501,177
Due after ten years, Fair Value	561,992	503,999
Total available-for-sale securities, Amortized Cost	2,265,118	1,785,113
Available-for-sale securities, at fair value	2,176,290	1,796,076
Asset-Backed Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Total available-for-sale securities, Amortized Cost	620,419	261,871
Available-for-sale securities, at fair value	605,225	271,574
Other Equity Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Total available-for-sale securities, Amortized Cost	50,532	52,846
Available-for-sale securities, at fair value	$51,528	$49,699

AvailableForSale_Securities_Na

Available-For-Sale Securities (Narrative) (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
	securities								securities
Schedule of Available-for-sale Securities [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Number of trust preferred securities in a continuous unrealized loss position, twelve months or longer	3	'	'	'	'	'	'	'	3	'	'
Income tax expense	$22,534,000	$22,519,000	$21,943,000	$20,234,000	$18,782,000	$19,871,000	$15,734,000	$14,549,000	$87,230,000	$68,936,000	$50,458,000
Securities, carrying value	1,200,000,000	'	'	'	1,100,000,000	'	'	'	1,200,000,000	1,100,000,000	'
Number of securities by a single non-goverment sponsored issuer exceeding 10% of shareholders' equity	0	'	'	'	'	'	'	'	0	'	'
Available-for-sale Securities [Member]	'	'	'	'	'	'	'	'	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Income tax expense	'	'	'	'	'	'	'	'	$1,200,000	$1,900,000	$705,000

Loans_Summary_of_Loan_Portfoli

Loans (Summary of Loan Portfolio) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Loans [Line Items]	'	'
Loans, net of unearned income, excluding covered loans	$12,896,602	$11,828,943
Covered loans	346,431	560,087
Total loans	13,243,033	12,389,030
Total loans, percentage	97.00%	96.00%
Covered loans, percentage	3.00%	4.00%
Percentage of Loans Net of Unearned Income Including Covered Loans	100.00%	100.00%
Commercial	'	'
Loans [Line Items]	'	'
Loans, net of unearned income, excluding covered loans	3,253,687	2,914,798
Total loans, percentage	25.00%	24.00%
Commercial real-estate	'	'
Loans [Line Items]	'	'
Loans, net of unearned income, excluding covered loans	4,230,035	3,864,118
Total loans, percentage	32.00%	31.00%
Home equity	'	'
Loans [Line Items]	'	'
Loans, net of unearned income, excluding covered loans	719,137	788,474
Total loans, percentage	5.00%	6.00%
Residential real estate	'	'
Loans [Line Items]	'	'
Loans, net of unearned income, excluding covered loans	434,992	367,213
Total loans, percentage	3.00%	3.00%
Premium finance receivables | Commercial insurance loans	'	'
Loans [Line Items]	'	'
Loans, net of unearned income, excluding covered loans	2,167,565	1,987,856
Total loans, percentage	16.00%	16.00%
Premium finance receivables | Premium Finance Receivables Life Insurance [Member]	'	'
Loans [Line Items]	'	'
Loans, net of unearned income, excluding covered loans	1,923,698	1,725,166
Total loans, percentage	15.00%	14.00%
Indirect consumer	'	'
Loans [Line Items]	'	'
Loans, net of unearned income, excluding covered loans	50,680	77,333
Total loans, percentage	0.00%	1.00%
Consumer and other	'	'
Loans [Line Items]	'	'
Loans, net of unearned income, excluding covered loans	$116,808	$103,985
Total loans, percentage	1.00%	1.00%

Loans_Unpaid_Principal_Balance

Loans (Unpaid Principal Balance and Carrying Value of Acquired Loans) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Bank Acquisitions [Member]	'	'
Loans [Line Items]	'	'
Unpaid Principal Balance	$453,944	$674,868
Carrying Value	338,517	503,837
Life Insurance Premium Finance Acquisition [Member]	'	'
Loans [Line Items]	'	'
Unpaid Principal Balance	437,155	536,503
Carrying Value	$423,906	$514,459

Loans_Estimated_Details_on_Loa

Loans (Estimated Details on Loans Acquisition) (Details) (USD $)	1-May-13	Oct. 18, 2013
In Thousands, unless otherwise specified	First Lansing Bancorp, Inc. [Member]	Diamond
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]	'	'
Contractually required payments including interest	$32,022	$47,853
Less: Nonaccretable difference	8,890	12,898
Cash flows expected to be collected	23,132	34,955
Less: Accretable yield	-2,055	-3,451
Fair value of loans acquired with evidence of credit quality deterioration since origination	$21,077	$31,504

Loans_Activity_Related_to_Accr

Loans (Activity Related to Accretable Yield of Loans Acquired with Evidence of Credit Quality Deterioration Since Origination) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Bank Acquisitions [Member]	'		'
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]	'		'
Accretable yield, beginning balance	$143,224	[1]	$173,120
Acquisitions	5,428		8,217
Accretable yield amortized to interest income	-36,898		-52,101
Accretable yield amortized to indemnification asset	-36,202	[2]	-66,798	[2]
Reclassification from non-accretable difference	50,873	[3]	64,603	[3]
(Decreases) increases in interest cash flows due to payments and changes in interest rates	-18,770		16,183
Accretable yield, ending balance	107,655	[1]	143,224	[1]
Life Insurance Premium Finance Acquisition [Member]	'		'
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]	'		'
Accretable yield, beginning balance	13,055	[1]	18,861
Acquisitions	0		0
Accretable yield amortized to interest income	-8,795		-11,441
Accretable yield amortized to indemnification asset	0	[2]	0	[2]
Reclassification from non-accretable difference	2,840	[3]	4,096	[3]
(Decreases) increases in interest cash flows due to payments and changes in interest rates	1,154		1,539
Accretable yield, ending balance	$8,254	[1]	$13,055	[1]
[1]	As of December 31, 2013, the Company estimates that the remaining accretable yield balance to be amortized to the indemnification asset for the bank acquisitions is $33.7 million. The remainder of the accretable yield related to bank acquisitions is expected to be amortized to interest income.Accretion to interest income from loans acquired in bank acquisitions totaled $36.9 million and $52.1 million in 2013 and 2012, respectively. These amounts include accretion from both covered and non-covered loans, and are included together within interest and fees on loans in the Consolidated Statements of Income.
[2]	Represents the portion of the current period accreted yield, resulting from lower expected losses, applied to reduce the loss share indemnfication asset.
[3]	Reclassification is the result of subsequent increases in expected principal cash flows.

Loans_Narrative_Details

Loans (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Loans [Line Items]	'	'
Deferred Discounts, Finance Charges and Interest Included in Receivables	$41,900,000	$41,100,000
Loans and Leases Receivable, Deferred Income	-9,200,000	13,200,000
Loans pledged as collateral	2,900,000,000	2,500,000,000
Federal Home Loan Bank advances	417,762,000	414,122,000
Remaining accretable yield balance to be amortized	33,700,000	'
Federal Home Loan Bank Advances [Member]	'	'
Loans [Line Items]	'	'
Loans pledged as collateral	2,400,000,000	'
Federal Reserve Bank Advances [Member]	'	'
Loans [Line Items]	'	'
Loans pledged as collateral	461,200,000	'
Bank Acquisitions [Member]	'	'
Loans [Line Items]	'	'
Certain Loans Acquired Accretable Yield Amortized To Interest Income	$36,898,000	$52,101,000

Allowance_for_Loan_Losses_Allo2

Allowance for Loan Losses Allowance for Losses on Lending-Related Commitments and Impaired Loans (Schedule of Aging of the Company's Loan Portfolio) (Details) (USD $)	Dec. 31, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'
Nonaccrual	$103,582		$109,742
90+ days and still accruing	86,484		133,990
60-89 days past due	39,698		58,964
30-59 days past due	84,566		105,459
Current	12,928,703		11,980,875
Total loans	13,243,033		12,389,030
Loans, net of unearned income excluding covered loans, Nonaccrual	94,157		107,754
Loans, net of unearned income excluding covered loans, 90+ days past due and still accruing	30,202		11,640
Loans, net of unearned income excluding covered loans, 60-89 days past due and still accruing	33,821		42,856
Loans, net of unearned income excluding covered loans, 30-59 days past due and still accruing	76,629		97,460
Loans, net of unearned income excluding covered loans, current	12,661,793		11,569,233
Loans, net of unearned income, excluding covered loans	12,896,602		11,828,943
Covered loans, Nonaccrual	9,425		1,988
Covered loans, 90+ days past due and still accruing	56,282		122,350
Covered loans, 60-89 days past due and still accruing	5,877		16,108
Covered loans, 30-59 days past due and still accruing	7,937		7,999
Covered loans, Current	266,910		411,642
Covered loans	346,431		560,087
Commercial	'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'
Nonaccrual	10,780		21,737
90+ days and still accruing	274		496
60-89 days past due	5,882		7,226
30-59 days past due	11,755		22,935
Current	3,224,996		2,862,404
Loans, net of unearned income, excluding covered loans	3,253,687		2,914,798
Commercial | Commercial and industrial	'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'
Nonaccrual	10,143		19,409
90+ days and still accruing	0		0
60-89 days past due	4,938		5,520
30-59 days past due	7,404		15,410
Current	1,813,721		1,587,864
Loans, net of unearned income, excluding covered loans	1,836,206		1,628,203
Commercial | Franchise	'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'
Nonaccrual	0		1,792
90+ days and still accruing	0		0
60-89 days past due	400		0
30-59 days past due	0		0
Current	219,983		194,603
Loans, net of unearned income, excluding covered loans	220,383		196,395
Commercial | Mortgage warehouse lines of credit	'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'
Nonaccrual	0		0
90+ days and still accruing	0		0
60-89 days past due	0		0
30-59 days past due	0		0
Current	67,470		215,076
Loans, net of unearned income, excluding covered loans	67,470		215,076
Commercial | Community Advantage - homeowners association	'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'
Nonaccrual	0		0
90+ days and still accruing	0		0
60-89 days past due	0		0
30-59 days past due	0		0
Current	90,894		81,496
Loans, net of unearned income, excluding covered loans	90,894		81,496
Commercial | Aircraft	'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'
Nonaccrual	0		0
90+ days and still accruing	0		0
60-89 days past due	0		148
30-59 days past due	0		0
Current	10,241		17,216
Loans, net of unearned income, excluding covered loans	10,241		17,364
Commercial | Asset-based lending	'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'
Nonaccrual	637		536
90+ days and still accruing	0		0
60-89 days past due	388		1,126
30-59 days past due	1,878		6,622
Current	732,190		564,154
Loans, net of unearned income, excluding covered loans	735,093		572,438
Commercial | Tax exempt	'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'
Nonaccrual	0		0
90+ days and still accruing	0		0
60-89 days past due	0		0
30-59 days past due	0		0
Current	161,239		91,824
Loans, net of unearned income, excluding covered loans	161,239		91,824
Commercial | Leases	'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'
Nonaccrual	0		0
90+ days and still accruing	0		0
60-89 days past due	0		0
30-59 days past due	788		896
Current	109,043		89,547
Loans, net of unearned income, excluding covered loans	109,831		90,443
Commercial | Other	'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'
Nonaccrual	0		0
90+ days and still accruing	0		0
60-89 days past due	0		0
30-59 days past due	0		0
Current	11,147		16,549
Loans, net of unearned income, excluding covered loans	11,147		16,549
Commercial | Purchased non-covered commercial	'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'
Nonaccrual	0	[1]	0	[1]
90+ days and still accruing	274	[1]	496	[1]
60-89 days past due	156	[1]	432	[1]
30-59 days past due	1,685	[1]	7	[1]
Current	9,068	[1]	4,075	[1]
Loans, net of unearned income, excluding covered loans	11,183	[1],[2]	5,010	[1],[2]
Commercial real-estate	'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'
Nonaccrual	46,658		49,973
90+ days and still accruing	18,812		749
60-89 days past due	15,394		24,096
30-59 days past due	29,870		35,128
Current	4,119,301		3,754,172
Loans, net of unearned income, excluding covered loans	4,230,035		3,864,118
Commercial real-estate | Residential construction	'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'
Nonaccrual	149		3,110
90+ days and still accruing	0		0
60-89 days past due	0		4
30-59 days past due	0		41
Current	38,351		37,246
Loans, net of unearned income, excluding covered loans	38,500		40,401
Commercial real-estate | Commercial construction	'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'
Nonaccrual	6,969		2,159
90+ days and still accruing	0		0
60-89 days past due	0		885
30-59 days past due	505		386
Current	129,232		167,525
Loans, net of unearned income, excluding covered loans	136,706		170,955
Commercial real-estate | Land	'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'
Nonaccrual	2,814		11,299
90+ days and still accruing	0		0
60-89 days past due	4,224		632
30-59 days past due	619		9,014
Current	99,128		113,252
Loans, net of unearned income, excluding covered loans	106,785		134,197
Commercial real-estate | Office	'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'
Nonaccrual	10,087		4,196
90+ days and still accruing	0		0
60-89 days past due	2,265		1,889
30-59 days past due	3,862		3,280
Current	626,027		560,346
Loans, net of unearned income, excluding covered loans	642,241		569,711
Commercial real-estate | Industrial	'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'
Nonaccrual	5,654		2,089
90+ days and still accruing	0		0
60-89 days past due	585		6,042
30-59 days past due	914		4,512
Current	626,785		565,294
Loans, net of unearned income, excluding covered loans	633,938		577,937
Commercial real-estate | Retail	'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'
Nonaccrual	10,862		7,792
90+ days and still accruing	0		0
60-89 days past due	837		1,372
30-59 days past due	2,435		998
Current	642,125		558,734
Loans, net of unearned income, excluding covered loans	656,259		568,896
Commercial real-estate | Multi-family	'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'
Nonaccrual	2,035		2,586
90+ days and still accruing	0		0
60-89 days past due	0		3,949
30-59 days past due	348		1,040
Current	564,154		389,116
Loans, net of unearned income, excluding covered loans	566,537		396,691
Commercial real-estate | Mixed use and other	'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'
Nonaccrual	8,088		16,742
90+ days and still accruing	230		0
60-89 days past due	3,943		6,660
30-59 days past due	15,949		13,349
Current	1,344,244		1,312,503
Loans, net of unearned income, excluding covered loans	1,372,454		1,349,254
Commercial real-estate | Purchased non-covered commercial real-estate	'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'
Nonaccrual	0	[1]	0	[1]
90+ days and still accruing	18,582	[1]	749	[1]
60-89 days past due	3,540	[1]	2,663	[1]
30-59 days past due	5,238	[1]	2,508	[1]
Current	49,255	[1]	50,156	[1]
Loans, net of unearned income, excluding covered loans	76,615	[1],[2]	56,076	[1],[2]
Home equity	'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'
Nonaccrual	10,071		13,423
90+ days and still accruing	0		100
60-89 days past due	1,344		1,592
30-59 days past due	3,060		5,043
Current	704,662		768,316
Loans, net of unearned income, excluding covered loans	719,137		788,474
Residential real estate	'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	434,992		367,213
Residential real estate | Residential real estate	'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'
Nonaccrual	14,974		11,728
90+ days and still accruing	0		0
60-89 days past due	1,689		2,763
30-59 days past due	5,032		8,250
Current	410,430		343,616
Loans, net of unearned income, excluding covered loans	432,125		366,357
Residential real estate | Purchased non-covered residential real estate	'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'
Nonaccrual	0	[1]	0	[1]
90+ days and still accruing	1,988	[1]	0	[1]
60-89 days past due	0	[1]	200	[1]
30-59 days past due	0	[1]	0	[1]
Current	879	[1]	656	[1]
Loans, net of unearned income, excluding covered loans	2,867	[1],[2]	856	[1],[2]
Premium finance receivables | Commercial insurance loans	'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'
Nonaccrual	10,537		9,302
90+ days and still accruing	8,842		10,008
60-89 days past due	6,912		6,729
30-59 days past due	24,094		19,597
Current	2,117,180		1,942,220
Loans, net of unearned income, excluding covered loans	2,167,565		1,987,856
Premium finance receivables | Life insurance loans	'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'
Nonaccrual	0		25
90+ days and still accruing	0		0
60-89 days past due	2,524		0
30-59 days past due	1,808		5,531
Current	1,495,460		1,205,151
Loans, net of unearned income, excluding covered loans	1,499,792		1,210,707
Premium finance receivables | Purchased life insurance loans	'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'
Nonaccrual	0	[1]	0	[1]
90+ days and still accruing	0	[1]	0	[1]
60-89 days past due	0	[1]	0	[1]
30-59 days past due	0	[1]	0	[1]
Current	423,906	[1]	514,459	[1]
Loans, net of unearned income, excluding covered loans	423,906	[1],[2]	514,459	[1],[2]
Indirect consumer	'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'
Nonaccrual	55		55
90+ days and still accruing	105		189
60-89 days past due	29		51
30-59 days past due	353		442
Current	50,138		76,596
Loans, net of unearned income, excluding covered loans	50,680		77,333
Consumer and other	'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	116,808		103,985
Consumer and other | Consumer and other	'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'
Nonaccrual	1,082		1,511
90+ days and still accruing	0		32
60-89 days past due	47		167
30-59 days past due	657		433
Current	113,818		99,010
Loans, net of unearned income, excluding covered loans	115,604		101,153
Consumer and other | Purchased non-covered consumer and other	'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'
Nonaccrual	0	[1]	0	[1]
90+ days and still accruing	181	[1]	66	[1]
60-89 days past due	0	[1]	32	[1]
30-59 days past due	0	[1]	101	[1]
Current	1,023	[1]	2,633	[1]
Loans, net of unearned income, excluding covered loans	$1,204	[1],[2]	$2,832	[1],[2]
[1]	Purchased loans represent loans acquired with evidence of credit quality deterioration since origination, in accordance with ASCB 310-30. Loan agings are based upon contractually required payments. See Note 4 - Loans for further discussion of these purchased loans.
[2]	Purchased loans represent loans acquired with evidence of credit quality deterioration since origination, in accordance with ASCB 310-30. See Note 4 - Loans for further discussion of these purchased loans.

Allowance_for_Loan_Losses_Allo3

Allowance for Loan Losses Allowance for Losses on Lending-Related Commitments and Impaired Loans (Summary of Recorded Investment Based on Performance of Loans by Class) (Details) (USD $)	Dec. 31, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	$12,896,602		$11,828,943
Performing	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	12,793,268		11,710,860
Non-performing	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	103,334		118,083
Commercial	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	3,253,687		2,914,798
Commercial | Commercial and industrial	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	1,836,206		1,628,203
Commercial | Franchise	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	220,383		196,395
Commercial | Mortgage warehouse lines of credit	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	67,470		215,076
Commercial | Community Advantage - homeowners association	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	90,894		81,496
Commercial | Aircraft	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	10,241		17,364
Commercial | Asset-based lending	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	735,093		572,438
Commercial | Tax exempt	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	161,239		91,824
Commercial | Leases	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	109,831		90,443
Commercial | Other	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	11,147		16,549
Commercial | Purchased non-covered commercial	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	11,183	[1],[2]	5,010	[1],[2]
Commercial | Performing	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	3,242,907		2,893,061
Commercial | Performing | Commercial and industrial	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	1,826,063		1,608,794
Commercial | Performing | Franchise	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	220,383		194,603
Commercial | Performing | Mortgage warehouse lines of credit	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	67,470		215,076
Commercial | Performing | Community Advantage - homeowners association	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	90,894		81,496
Commercial | Performing | Aircraft	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	10,241		17,364
Commercial | Performing | Asset-based lending	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	734,456		571,902
Commercial | Performing | Tax exempt	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	161,239		91,824
Commercial | Performing | Leases	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	109,831		90,443
Commercial | Performing | Other	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	11,147		16,549
Commercial | Performing | Purchased non-covered commercial	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	11,183	[1]	5,010	[1]
Commercial | Non-performing	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	10,780		21,737
Commercial | Non-performing | Commercial and industrial	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	10,143		19,409
Commercial | Non-performing | Franchise	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	'		1,792
Commercial | Non-performing | Mortgage warehouse lines of credit	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	0		0
Commercial | Non-performing | Community Advantage - homeowners association	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	0		0
Commercial | Non-performing | Aircraft	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	0		0
Commercial | Non-performing | Asset-based lending	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	637		536
Commercial | Non-performing | Tax exempt	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	0		0
Commercial | Non-performing | Leases	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	0		0
Commercial | Non-performing | Other	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	0		0
Commercial | Non-performing | Purchased non-covered commercial	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	0	[1]	0	[1]
Commercial real-estate	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	4,230,035		3,864,118
Commercial real-estate | Residential construction	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	38,500		40,401
Commercial real-estate | Commercial construction	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	136,706		170,955
Commercial real-estate | Land	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	106,785		134,197
Commercial real-estate | Office	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	642,241		569,711
Commercial real-estate | Industrial	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	633,938		577,937
Commercial real-estate | Retail	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	656,259		568,896
Commercial real-estate | Multi-family	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	566,537		396,691
Commercial real-estate | Mixed use and other	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	1,372,454		1,349,254
Commercial real-estate | Purchased non-covered commercial real-estate	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	76,615	[1],[2]	56,076	[1],[2]
Commercial real-estate | Performing	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	4,183,147		3,814,145
Commercial real-estate | Performing | Residential construction	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	38,351		37,291
Commercial real-estate | Performing | Commercial construction	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	129,737		168,796
Commercial real-estate | Performing | Land	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	103,971		122,898
Commercial real-estate | Performing | Office	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	632,154		565,515
Commercial real-estate | Performing | Industrial	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	628,284		575,848
Commercial real-estate | Performing | Retail	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	645,397		561,104
Commercial real-estate | Performing | Multi-family	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	564,502		394,105
Commercial real-estate | Performing | Mixed use and other	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	1,364,136		1,332,512
Commercial real-estate | Performing | Purchased non-covered commercial real-estate	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	76,615	[1]	56,076	[1]
Commercial real-estate | Non-performing	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	46,888		49,973
Commercial real-estate | Non-performing | Residential construction	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	149		3,110
Commercial real-estate | Non-performing | Commercial construction	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	6,969		2,159
Commercial real-estate | Non-performing | Land	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	2,814		11,299
Commercial real-estate | Non-performing | Office	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	10,087		4,196
Commercial real-estate | Non-performing | Industrial	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	5,654		2,089
Commercial real-estate | Non-performing | Retail	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	10,862		7,792
Commercial real-estate | Non-performing | Multi-family	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	2,035		2,586
Commercial real-estate | Non-performing | Mixed use and other	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	8,318		16,742
Commercial real-estate | Non-performing | Purchased non-covered commercial real-estate	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	0	[1]	0	[1]
Home equity	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	719,137		788,474
Home equity | Performing	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	709,066		774,951
Home equity | Non-performing	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	10,071		13,523
Residential real estate	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	434,992		367,213
Residential real estate | Residential real estate	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	432,125		366,357
Residential real estate | Purchased non-covered residential real estate	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	2,867	[1],[2]	856	[1],[2]
Residential real estate | Performing | Residential real estate	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	417,151		354,629
Residential real estate | Performing | Purchased non-covered residential real estate	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	2,867	[1]	856	[1]
Residential real estate | Non-performing | Residential real estate	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	14,974		11,728
Residential real estate | Non-performing | Purchased non-covered residential real estate	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	0	[1]	0	[1]
Premium finance receivables | Commercial insurance loans	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	2,167,565		1,987,856
Premium finance receivables | Life insurance loans	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	1,499,792		1,210,707
Premium finance receivables | Purchased life insurance loans	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	423,906	[1],[2]	514,459	[1],[2]
Premium finance receivables | Performing | Commercial insurance loans	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	2,148,186		1,968,546
Premium finance receivables | Performing | Life insurance loans	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	1,499,792		1,210,682
Premium finance receivables | Performing | Purchased life insurance loans	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	423,906	[1]	514,459	[1]
Premium finance receivables | Non-performing | Commercial insurance loans	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	19,379		19,310
Premium finance receivables | Non-performing | Life insurance loans	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	'		25
Premium finance receivables | Non-performing | Purchased life insurance loans	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	0	[1]	0	[1]
Indirect consumer	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	50,680		77,333
Indirect consumer | Performing	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	50,520		77,089
Indirect consumer | Non-performing	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	160		244
Consumer and other	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	116,808		103,985
Consumer and other | Consumer and other	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	115,604		101,153
Consumer and other | Purchased non-covered consumer and other	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	1,204	[1],[2]	2,832	[1],[2]
Consumer and other | Performing | Consumer and other	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	114,522		99,610
Consumer and other | Performing | Purchased non-covered consumer and other	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	1,204	[1]	2,832	[1]
Consumer and other | Non-performing | Consumer and other	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	1,082		1,543
Consumer and other | Non-performing | Purchased non-covered consumer and other	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Loans, net of unearned income, excluding covered loans	$0	[1]	$0	[1]
[1]	Purchased loans represent loans acquired with evidence of credit quality deterioration since origination, in accordance with ASCB 310-30. See Note 4 - Loans for further discussion of these purchased loans.
[2]	Purchased loans represent loans acquired with evidence of credit quality deterioration since origination, in accordance with ASCB 310-30. Loan agings are based upon contractually required payments. See Note 4 - Loans for further discussion of these purchased loans.

Allowance_for_Loan_Losses_Allo4

Allowance for Loan Losses Allowance for Losses on Lending-Related Commitments and Impaired Loans (Summary of Activity in the Allowance for Credit Losses by Loan Portfolio) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Allowance for Loan Losses [Roll Forward]	'	'
Allowance for loan losses at beginning of period	$107,351	$110,381
Other adjustments	-938	-1,333
Reclassification to/from allowance for unfunded lending-related commitments	640	693
Charge-offs	-62,377	-84,390
Recoveries	6,262	9,588
Provision for credit losses	45,984	72,412
Allowance for loan losses at period end	96,922	107,351
Allowance for unfunded lending-related commitments at period end	719	14,647
Allowance for credit losses at period end	97,641	121,998
Allowance for credit losses, Individually evaluated for impairment	8,402	27,657
Allowance for credit losses, Collectively evaluated for impairment	89,112	94,243
Allowance for credit losses, Loans acquired with deteriorated credit quality	127	98
Loans, Individually evaluated for impairment	164,564	204,545
Loans, Collectively evaluated for impairment	12,216,263	11,045,165
Loans, Loans acquired with deteriorated credit quality	515,775	579,233
Commercial	'	'
Allowance for Loan Losses [Roll Forward]	'	'
Allowance for loan losses at beginning of period	28,794	31,237
Other adjustments	-51	-151
Reclassification to/from allowance for unfunded lending-related commitments	0	45
Charge-offs	-14,123	-22,405
Recoveries	1,655	1,220
Provision for credit losses	6,817	18,848
Allowance for loan losses at period end	23,092	28,794
Allowance for unfunded lending-related commitments at period end	0	0
Allowance for credit losses at period end	23,092	28,794
Allowance for credit losses, Individually evaluated for impairment	1,392	3,296
Allowance for credit losses, Collectively evaluated for impairment	21,637	25,471
Allowance for credit losses, Loans acquired with deteriorated credit quality	63	27
Loans, Individually evaluated for impairment	17,628	33,608
Loans, Collectively evaluated for impairment	3,224,876	2,876,180
Loans, Loans acquired with deteriorated credit quality	11,183	5,010
Commercial real-estate	'	'
Allowance for Loan Losses [Roll Forward]	'	'
Allowance for loan losses at beginning of period	52,135	56,405
Other adjustments	-783	-1,054
Reclassification to/from allowance for unfunded lending-related commitments	640	648
Charge-offs	-32,745	-43,539
Recoveries	2,526	6,635
Provision for credit losses	26,885	33,040
Allowance for loan losses at period end	48,658	52,135
Allowance for unfunded lending-related commitments at period end	719	14,647
Allowance for credit losses at period end	49,377	66,782
Allowance for credit losses, Individually evaluated for impairment	4,653	20,481
Allowance for credit losses, Collectively evaluated for impairment	44,724	46,233
Allowance for credit losses, Loans acquired with deteriorated credit quality	0	68
Loans, Individually evaluated for impairment	117,149	139,878
Loans, Collectively evaluated for impairment	4,036,271	3,668,164
Loans, Loans acquired with deteriorated credit quality	76,615	56,076
Home equity	'	'
Allowance for Loan Losses [Roll Forward]	'	'
Allowance for loan losses at beginning of period	12,734	7,712
Other adjustments	3	-4
Reclassification to/from allowance for unfunded lending-related commitments	0	0
Charge-offs	-6,361	-9,361
Recoveries	432	428
Provision for credit losses	5,803	13,959
Allowance for loan losses at period end	12,611	12,734
Allowance for unfunded lending-related commitments at period end	0	0
Allowance for credit losses at period end	12,611	12,734
Allowance for credit losses, Individually evaluated for impairment	1,593	2,569
Allowance for credit losses, Collectively evaluated for impairment	11,018	10,165
Allowance for credit losses, Loans acquired with deteriorated credit quality	0	0
Loans, Individually evaluated for impairment	10,297	14,590
Loans, Collectively evaluated for impairment	708,840	773,884
Loans, Loans acquired with deteriorated credit quality	0	0
Residential real estate	'	'
Allowance for Loan Losses [Roll Forward]	'	'
Allowance for loan losses at beginning of period	5,560	5,028
Other adjustments	-88	-124
Reclassification to/from allowance for unfunded lending-related commitments	0	0
Charge-offs	-2,958	-4,060
Recoveries	289	22
Provision for credit losses	2,305	4,694
Allowance for loan losses at period end	5,108	5,560
Allowance for unfunded lending-related commitments at period end	0	0
Allowance for credit losses at period end	5,108	5,560
Allowance for credit losses, Individually evaluated for impairment	655	1,169
Allowance for credit losses, Collectively evaluated for impairment	4,390	4,388
Allowance for credit losses, Loans acquired with deteriorated credit quality	63	3
Loans, Individually evaluated for impairment	17,901	14,810
Loans, Collectively evaluated for impairment	414,224	351,547
Loans, Loans acquired with deteriorated credit quality	2,867	856
Premium finance receivables	'	'
Allowance for Loan Losses [Roll Forward]	'	'
Allowance for loan losses at beginning of period	6,096	7,214
Other adjustments	-19	0
Reclassification to/from allowance for unfunded lending-related commitments	0	0
Charge-offs	-5,080	-3,780
Recoveries	1,121	940
Provision for credit losses	3,465	1,722
Allowance for loan losses at period end	5,583	6,096
Allowance for unfunded lending-related commitments at period end	0	0
Allowance for credit losses at period end	5,583	6,096
Allowance for credit losses, Individually evaluated for impairment	0	0
Allowance for credit losses, Collectively evaluated for impairment	5,583	6,096
Allowance for credit losses, Loans acquired with deteriorated credit quality	0	0
Loans, Individually evaluated for impairment	0	0
Loans, Collectively evaluated for impairment	3,667,357	3,198,563
Loans, Loans acquired with deteriorated credit quality	423,906	514,459
Indirect consumer	'	'
Allowance for Loan Losses [Roll Forward]	'	'
Allowance for loan losses at beginning of period	267	645
Other adjustments	0	0
Reclassification to/from allowance for unfunded lending-related commitments	0	0
Charge-offs	-130	-221
Recoveries	53	103
Provision for credit losses	-8	-260
Allowance for loan losses at period end	182	267
Allowance for unfunded lending-related commitments at period end	0	0
Allowance for credit losses at period end	182	267
Allowance for credit losses, Individually evaluated for impairment	0	0
Allowance for credit losses, Collectively evaluated for impairment	182	267
Allowance for credit losses, Loans acquired with deteriorated credit quality	0	0
Loans, Individually evaluated for impairment	55	53
Loans, Collectively evaluated for impairment	50,625	77,280
Loans, Loans acquired with deteriorated credit quality	0	0
Consumer and other	'	'
Allowance for Loan Losses [Roll Forward]	'	'
Allowance for loan losses at beginning of period	1,765	2,140
Other adjustments	0	0
Reclassification to/from allowance for unfunded lending-related commitments	0	0
Charge-offs	-980	-1,024
Recoveries	186	240
Provision for credit losses	717	409
Allowance for loan losses at period end	1,688	1,765
Allowance for unfunded lending-related commitments at period end	0	0
Allowance for credit losses at period end	1,688	1,765
Allowance for credit losses, Individually evaluated for impairment	109	142
Allowance for credit losses, Collectively evaluated for impairment	1,578	1,623
Allowance for credit losses, Loans acquired with deteriorated credit quality	1	0
Loans, Individually evaluated for impairment	1,534	1,606
Loans, Collectively evaluated for impairment	114,070	99,547
Loans, Loans acquired with deteriorated credit quality	$1,204	$2,832

Allowance_for_Loan_Losses_Allo5

Allowance for Loan Losses Allowance for Losses on Lending-Related Commitments and Impaired Loans (Summary of Activity in the Allowance for Covered Loan Losses) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Allowance for Covered Loan Losses [Roll Forward]	'	'
Balance at beginning of period	$13,454	$12,977
Provision for covered loan losses before benefit attributable to FDIC loss share agreements	246	20,282
Benefit attributable to FDIC loss share agreements	-197	-16,258
Net provision for covered loan losses	49	4,024
Increase in FDIC indemnification asset	197	16,258
Loans charged-off	-15,085	-19,921
Recoveries of loans charged-off	11,477	116
Net charge-offs	3,608	19,805
Balance at end of period	$10,092	$13,454

Allowance_for_Loan_Losses_Allo6

Allowance for Loan Losses Allowance for Losses on Lending-Related Commitments and Impaired Loans (Summary of Impaired Loans, Including Restructured Loans) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Loans and Leases Receivable, Allowance [Abstract]	'		'		'
Impaired loans with an allowance for loan loss required	$92,184	[1]	$89,983	[1]	'
Impaired loans with no allowance for loan loss required	70,045		114,562		'
Total impaired loans	162,229		204,545	[2]	'
Allowance for loan losses related to impaired loans	8,265		13,575		'
Troubled debt restructurings	'		126,473		'
Reduction of interest income from non-accrual loans	3,971		3,866		'
Interest income recognized on impaired loans	$8,920		$10,819		$12,500
[1]	These impaired loans require an allowance for loan losses because the estimated fair value of the loans or related collateral is less than the recorded investment in the loans.
[2]	Impaired loans are considered by the Company to be non-accrual loans, TDRs or loans with principal and/or interest at risk, even if the loan is current with all payments of principal and interest.

Allowance_for_Loan_Losses_Allo7

Allowance for Loan Losses Allowance for Losses on Lending-Related Commitments and Impaired Loans (Summary of Impaired Loans Evaluated for Impairment by Loan Class) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired loans with an allowance for loan loss required	$92,184	[1]	$89,983	[1]	'
Impaired loans with no allowance for loan loss required	70,045		114,562		'
Recorded Investment	162,229		204,545	[2]	'
Impaired Financing Receivable, Unpaid Principal Balance	195,455		231,340		'
Related Allowance	8,265		13,575		'
Average recorded investment	170,658		222,076		247,100
Impaired Financing Receivable, Interest Income, Accrual Method	8,920		10,819		12,500
Commercial | Commercial and industrial	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired loans with an allowance for loan loss required	6,297		11,010		'
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	7,001		12,562		'
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	6,611		13,312		'
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	354		881		'
Impaired loans with no allowance for loan loss required	9,890		20,270		'
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	16,333		27,574		'
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	13,928		23,877		'
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	1,043		1,259		'
Related Allowance	1,078		1,982		'
Commercial | Franchise	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired loans with an allowance for loan loss required	0		1,792		'
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		1,792		'
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		1,792		'
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		122		'
Impaired loans with no allowance for loan loss required	0		0		'
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		'
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0		'
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		'
Related Allowance	0		1,259		'
Commercial | Mortgage warehouse lines of credit	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired loans with an allowance for loan loss required	0		0		'
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		'
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		'
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		'
Impaired loans with no allowance for loan loss required	0		0		'
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		'
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0		'
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		'
Related Allowance	0		0		'
Commercial | Community Advantage - homeowners association	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired loans with an allowance for loan loss required	0		0		'
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		'
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		'
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		'
Impaired loans with no allowance for loan loss required	0		0		'
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		'
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0		'
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		'
Related Allowance	0		0		'
Commercial | Aircraft	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired loans with an allowance for loan loss required	0		0		'
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		'
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		'
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		'
Impaired loans with no allowance for loan loss required	0		0		'
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		'
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0		'
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		'
Related Allowance	0		0		'
Commercial | Asset-based lending	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired loans with an allowance for loan loss required	282		511		'
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	294		511		'
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	295		484		'
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	14		26		'
Impaired loans with no allowance for loan loss required	354		25		'
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	2,311		1,362		'
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	2,162		252		'
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	121		76		'
Related Allowance	282		55		'
Commercial | Tax exempt	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired loans with an allowance for loan loss required	0		0		'
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		'
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		'
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		'
Impaired loans with no allowance for loan loss required	0		0		'
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		'
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0		'
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		'
Related Allowance	0		0		'
Commercial | Leases	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired loans with an allowance for loan loss required	0		0		'
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		'
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		'
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		'
Impaired loans with no allowance for loan loss required	0		0		'
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		'
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0		'
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		'
Related Allowance	0		0		'
Commercial | Other	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired loans with an allowance for loan loss required	0		0		'
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		'
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		'
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		'
Impaired loans with no allowance for loan loss required	0		0		'
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		'
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0		'
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		'
Related Allowance	0		0		'
Commercial real-estate | Residential construction	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired loans with an allowance for loan loss required	0		2,007		'
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		2,007		'
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		2,007		'
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		98		'
Impaired loans with no allowance for loan loss required	1,463		4,085		'
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,530		4,440		'
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,609		4,507		'
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	64		143		'
Related Allowance	0		389		'
Commercial real-estate | Commercial construction	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired loans with an allowance for loan loss required	3,099		1,865		'
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	3,099		1,865		'
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	3,098		1,865		'
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	115		78		'
Impaired loans with no allowance for loan loss required	7,710		12,263		'
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	13,227		13,395		'
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	9,680		13,635		'
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	722		540		'
Related Allowance	18		70		'
Commercial real-estate | Land	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired loans with an allowance for loan loss required	10,518		12,184		'
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	11,871		12,860		'
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	10,323		12,673		'
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	411		483		'
Impaired loans with no allowance for loan loss required	5,035		12,163		'
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	8,813		17,141		'
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	5,384		14,646		'
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	418		906		'
Related Allowance	259		1,414		'
Commercial real-estate | Office	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired loans with an allowance for loan loss required	7,792		5,829		'
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	8,444		5,887		'
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	8,148		5,936		'
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	333		246		'
Impaired loans with no allowance for loan loss required	10,379		8,939		'
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	11,717		9,521		'
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	10,925		9,432		'
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	610		437		'
Related Allowance	1,253		622		'
Commercial real-estate | Industrial	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired loans with an allowance for loan loss required	3,385		1,150		'
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	3,506		1,200		'
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	3,638		1,208		'
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	179		75		'
Impaired loans with no allowance for loan loss required	5,087		3,598		'
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	5,267		3,776		'
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	5,160		3,741		'
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	328		181		'
Related Allowance	193		224		'
Commercial real-estate | Retail	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired loans with an allowance for loan loss required	17,511		13,240		'
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	17,638		13,314		'
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	17,678		13,230		'
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	724		584		'
Impaired loans with no allowance for loan loss required	7,047		18,073		'
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	8,610		18,997		'
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	8,462		19,067		'
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	400		892		'
Related Allowance	1,253		343		'
Commercial real-estate | Multi-family	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired loans with an allowance for loan loss required	3,237		3,954		'
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	3,730		3,954		'
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	2,248		3,972		'
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	139		157		'
Impaired loans with no allowance for loan loss required	608		2,817		'
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,030		4,494		'
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	903		4,120		'
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	47		222		'
Related Allowance	235		348		'
Commercial real-estate | Mixed use and other	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired loans with an allowance for loan loss required	28,935		22,249		'
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	29,051		23,166		'
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	26,792		23,185		'
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	1,194		1,165		'
Impaired loans with no allowance for loan loss required	4,077		15,462		'
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	6,213		17,210		'
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	5,046		16,122		'
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	352		912		'
Related Allowance	1,366		2,989		'
Home equity	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired loans with an allowance for loan loss required	3,985		7,270		'
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	5,238		7,313		'
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	4,855		7,282		'
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	236		271		'
Impaired loans with no allowance for loan loss required	6,312		7,320		'
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	7,790		8,758		'
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	6,307		8,164		'
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	324		376		'
Related Allowance	1,593		2,569		'
Residential real estate	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired loans with an allowance for loan loss required	6,876		6,420		'
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	7,023		6,931		'
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	6,335		6,424		'
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	273		226		'
Impaired loans with no allowance for loan loss required	10,761		8,390		'
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	13,585		9,189		'
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	9,443		9,069		'
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	393		337		'
Related Allowance	626		1,169		'
Premium finance receivables | Commercial insurance loans	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired loans with an allowance for loan loss required	0		0		'
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		'
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		'
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		'
Impaired loans with no allowance for loan loss required	0		0		'
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		'
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0		'
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		'
Related Allowance	0		0		'
Premium finance receivables | Life insurance loans	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired loans with an allowance for loan loss required	0		0		'
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		'
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		'
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		'
Impaired loans with no allowance for loan loss required	0		0		'
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		'
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0		'
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		'
Related Allowance	0		0		'
Premium finance receivables | Purchased life insurance loans	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired loans with an allowance for loan loss required	0		0		'
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		'
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		'
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		'
Impaired loans with no allowance for loan loss required	0		0		'
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		'
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0		'
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		'
Related Allowance	0		0		'
Indirect consumer	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired loans with an allowance for loan loss required	0		0		'
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		'
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		'
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		'
Impaired loans with no allowance for loan loss required	55		53		'
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	61		61		'
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	48		65		'
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	6		6		'
Related Allowance	0		0		'
Consumer and other	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired loans with an allowance for loan loss required	267		502		'
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	269		502		'
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	273		502		'
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	11		26		'
Impaired loans with no allowance for loan loss required	1,267		1,104		'
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,804		1,558		'
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,307		1,507		'
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	109		94		'
Related Allowance	$109		$142		'
[1]	These impaired loans require an allowance for loan losses because the estimated fair value of the loans or related collateral is less than the recorded investment in the loans.
[2]	Impaired loans are considered by the Company to be non-accrual loans, TDRs or loans with principal and/or interest at risk, even if the loan is current with all payments of principal and interest.

Allowance_for_Loan_Losses_Allo8

Allowance for Loan Losses Allowance for Losses on Lending-Related Commitments and Impaired Loans (Summary of the Post-Modification Balance of Loans Restructured) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
	Loan		Loan		Loan
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	35	[1],[2],[3]	75	[1],[2],[3]	123	[1],[2],[3]
Financing Receivable, Modifications, Post-Modification Recorded Investment	$22,680	[1],[2],[3]	$72,512	[1],[2],[3]	$100,528	[1],[2],[3]
Commercial | Commercial and industrial	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	6	[1],[2],[3]	18	[1],[2],[3]	24	[1],[2],[3]
Financing Receivable, Modifications, Post-Modification Recorded Investment	708	[1],[2],[3]	14,311	[1],[2],[3]	6,956	[1],[2],[3]
Commercial real-estate | Residential construction	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	0	[1],[2],[3]	3	[1],[2],[3]	1	[1],[2],[3]
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	[1],[2],[3]	2,147	[1],[2],[3]	1,105	[1],[2],[3]
Commercial real-estate | Commercial construction	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	3	[1],[2],[3]	2	[1],[2],[3]	8	[1],[2],[3]
Financing Receivable, Modifications, Post-Modification Recorded Investment	6,120	[1],[2],[3]	622	[1],[2],[3]	12,140	[1],[2],[3]
Commercial real-estate | Land	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	3	[1],[2],[3]	17	[1],[2],[3]	7	[1],[2],[3]
Financing Receivable, Modifications, Post-Modification Recorded Investment	2,639	[1],[2],[3]	31,836	[1],[2],[3]	7,971	[1],[2],[3]
Commercial real-estate | Office	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	4	[1],[2],[3]	0	[1],[2],[3]	9	[1],[2],[3]
Financing Receivable, Modifications, Post-Modification Recorded Investment	4,021	[1],[2],[3]	0	[1],[2],[3]	8,870	[1],[2],[3]
Commercial real-estate | Industrial	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	1	[1],[2],[3]	1	[1],[2],[3]	5	[1],[2],[3]
Financing Receivable, Modifications, Post-Modification Recorded Investment	949	[1],[2],[3]	727	[1],[2],[3]	5,334	[1],[2],[3]
Commercial real-estate | Retail	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	1	[1],[2],[3]	8	[1],[2],[3]	14	[1],[2],[3]
Financing Receivable, Modifications, Post-Modification Recorded Investment	200	[1],[2],[3]	13,518	[1],[2],[3]	19,113	[1],[2],[3]
Commercial real-estate | Multi-family	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	1	[1],[2],[3]	1	[1],[2],[3]	6	[1],[2],[3]
Financing Receivable, Modifications, Post-Modification Recorded Investment	705	[1],[2],[3]	380	[1],[2],[3]	4,415	[1],[2],[3]
Commercial real-estate | Mixed use and other	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	6	[1],[2],[3]	15	[1],[2],[3]	33	[1],[2],[3]
Financing Receivable, Modifications, Post-Modification Recorded Investment	5,042	[1],[2],[3]	7,333	[1],[2],[3]	28,708	[1],[2],[3]
Residential real estate and other	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	10	[1],[2],[3]	10	[1],[2],[3]	16	[1],[2],[3]
Financing Receivable, Modifications, Post-Modification Recorded Investment	2,296	[1],[2],[3]	1,638	[1],[2],[3]	5,916	[1],[2],[3]
Extension At Below Market Terms [Member]	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	30	[1]	59	[1]	82	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	21,862	[1]	58,612	[1]	71,633	[1]
Extension At Below Market Terms [Member] | Commercial | Commercial and industrial	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	5	[1]	11	[1]	11	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	573	[1]	3,603	[1]	2,273	[1]
Extension At Below Market Terms [Member] | Commercial real-estate | Residential construction	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	0	[1]	3	[1]	1	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	[1]	2,147	[1]	1,105	[1]
Extension At Below Market Terms [Member] | Commercial real-estate | Commercial construction	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	3	[1]	2	[1]	7	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	6,120	[1]	622	[1]	11,673	[1]
Extension At Below Market Terms [Member] | Commercial real-estate | Land	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	3	[1]	17	[1]	7	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	2,639	[1]	31,836	[1]	7,971	[1]
Extension At Below Market Terms [Member] | Commercial real-estate | Office	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	4	[1]	0	[1]	6	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	4,021	[1]	0	[1]	4,780	[1]
Extension At Below Market Terms [Member] | Commercial real-estate | Industrial	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	1	[1]	1	[1]	5	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	949	[1]	727	[1]	5,334	[1]
Extension At Below Market Terms [Member] | Commercial real-estate | Retail	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	1	[1]	8	[1]	11	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	200	[1]	13,518	[1]	16,981	[1]
Extension At Below Market Terms [Member] | Commercial real-estate | Multi-family	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	1	[1]	0	[1]	6	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	705	[1]	0	[1]	4,415	[1]
Extension At Below Market Terms [Member] | Commercial real-estate | Mixed use and other	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	6	[1]	9	[1]	21	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	5,042	[1]	4,769	[1]	14,775	[1]
Extension At Below Market Terms [Member] | Residential real estate and other	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	6	[1]	8	[1]	7	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	1,613	[1]	1,390	[1]	2,326	[1]
Reduction Of Interest Rate [Member]	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	22	[1]	53	[1]	80	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	9,128	[1]	62,241	[1]	60,858	[1]
Reduction Of Interest Rate [Member] | Commercial | Commercial and industrial	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	4	[1]	11	[1]	14	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	553	[1]	13,691	[1]	1,933	[1]
Reduction Of Interest Rate [Member] | Commercial real-estate | Residential construction	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	0	[1]	1	[1]	0	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	[1]	496	[1]	0	[1]
Reduction Of Interest Rate [Member] | Commercial real-estate | Commercial construction	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	0	[1]	2	[1]	3	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	[1]	622	[1]	9,402	[1]
Reduction Of Interest Rate [Member] | Commercial real-estate | Land	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	2	[1]	14	[1]	2	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	287	[1]	30,561	[1]	2,981	[1]
Reduction Of Interest Rate [Member] | Commercial real-estate | Office	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	1	[1]	0	[1]	6	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	556	[1]	0	[1]	4,036	[1]
Reduction Of Interest Rate [Member] | Commercial real-estate | Industrial	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	1	[1]	1	[1]	4	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	949	[1]	727	[1]	3,494	[1]
Reduction Of Interest Rate [Member] | Commercial real-estate | Retail	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	1	[1]	6	[1]	5	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	200	[1]	8,865	[1]	3,963	[1]
Reduction Of Interest Rate [Member] | Commercial real-estate | Multi-family	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	1	[1]	1	[1]	5	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	705	[1]	380	[1]	3,866	[1]
Reduction Of Interest Rate [Member] | Commercial real-estate | Mixed use and other	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	5	[1]	11	[1]	28	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	4,947	[1]	6,268	[1]	25,921	[1]
Reduction Of Interest Rate [Member] | Residential real estate and other	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	7	[1]	6	[1]	13	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	931	[1]	631	[1]	5,262	[1]
Modification To Interest Only Payments [Member]	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	8	[1]	41	[1]	39	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	7,471	[1]	56,383	[1]	26,474	[1]
Modification To Interest Only Payments [Member] | Commercial | Commercial and industrial	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	2	[1]	7	[1]	13	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	185	[1]	10,579	[1]	3,780	[1]
Modification To Interest Only Payments [Member] | Commercial real-estate | Residential construction	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	0	[1]	1	[1]	1	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	[1]	496	[1]	1,105	[1]
Modification To Interest Only Payments [Member] | Commercial real-estate | Commercial construction	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	3	[1]	2	[1]	1	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	6,120	[1]	622	[1]	467	[1]
Modification To Interest Only Payments [Member] | Commercial real-estate | Land	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	0	[1]	13	[1]	0	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	[1]	26,511	[1]	0	[1]
Modification To Interest Only Payments [Member] | Commercial real-estate | Office	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	0	[1]	0	[1]	3	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	[1]	0	[1]	4,292	[1]
Modification To Interest Only Payments [Member] | Commercial real-estate | Industrial	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	0	[1]	0	[1]	2	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	[1]	0	[1]	2,181	[1]
Modification To Interest Only Payments [Member] | Commercial real-estate | Retail	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	0	[1]	6	[1]	5	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	[1]	12,897	[1]	5,191	[1]
Modification To Interest Only Payments [Member] | Commercial real-estate | Multi-family	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	0	[1]	1	[1]	0	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	[1]	380	[1]	0	[1]
Modification To Interest Only Payments [Member] | Commercial real-estate | Mixed use and other	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	1	[1]	8	[1]	10	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	932	[1]	3,974	[1]	8,068	[1]
Modification To Interest Only Payments [Member] | Residential real estate and other	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	2	[1]	3	[1]	4	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	234	[1]	924	[1]	1,390	[1]
Forgiveness Of Debt [Member]	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	2	[1]	4	[1]	2	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	1,073	[1]	2,340	[1]	135	[1]
Forgiveness Of Debt [Member] | Commercial | Commercial and industrial	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	0	[1]	3	[1]	2	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	[1]	2,311	[1]	135	[1]
Forgiveness Of Debt [Member] | Commercial real-estate | Residential construction	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	0	[1]	0	[1]	0	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	[1]	0	[1]	0	[1]
Forgiveness Of Debt [Member] | Commercial real-estate | Commercial construction	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	0	[1]	0	[1]	0	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	[1]	0	[1]	0	[1]
Forgiveness Of Debt [Member] | Commercial real-estate | Land	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	1	[1]	0	[1]	0	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	73	[1]	0	[1]	0	[1]
Forgiveness Of Debt [Member] | Commercial real-estate | Office	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	0	[1]	0	[1]	0	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	[1]	0	[1]	0	[1]
Forgiveness Of Debt [Member] | Commercial real-estate | Industrial	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	0	[1]	0	[1]	0	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	[1]	0	[1]	0	[1]
Forgiveness Of Debt [Member] | Commercial real-estate | Retail	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	0	[1]	0	[1]	0	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	[1]	0	[1]	0	[1]
Forgiveness Of Debt [Member] | Commercial real-estate | Multi-family	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	0	[1]	0	[1]	0	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	[1]	0	[1]	0	[1]
Forgiveness Of Debt [Member] | Commercial real-estate | Mixed use and other	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	0	[1]	0	[1]	0	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	[1]	0	[1]	0	[1]
Forgiveness Of Debt [Member] | Residential real estate and other	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	1	[1]	1	[1]	0	[1]
Financing Receivable, Modifications, Post-Modification Recorded Investment	$1,000	[1]	$29	[1]	$0	[1]
[1]	Balances represent the recorded investment in the loan at the time of the restructuring.
[2]	Total TDRs represent all loans restructured in TDRs during the year indicated.
[3]	TDRs may have more than one modification representing a concession. As such, TDRs during the period may be represented in more than one of the categories noted above.

Allowance_for_Loan_Losses_Allo9

Allowance for Loan Losses Allowance for Losses on Lending-Related Commitments and Impaired Loans (Summary of Loans Restructured and Subsequently Defaulted Under the Restructured Terms) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
	Loan		Loan		Loan
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	35	[1],[2],[3]	75	[1],[2],[3]	123	[1],[2],[3]
Financing Receivable, Modifications, Post-Modification Recorded Investment	$22,680	[1],[2],[3]	$72,512	[1],[2],[3]	$100,528	[1],[2],[3]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	5	[1],[4]	18	[1],[4]	25	[1],[4]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	2,683	[1],[4]	20,553	[1],[4]	18,224	[1],[4]
Commercial | Commercial and industrial	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	6	[1],[2],[3]	18	[1],[2],[3]	24	[1],[2],[3]
Financing Receivable, Modifications, Post-Modification Recorded Investment	708	[1],[2],[3]	14,311	[1],[2],[3]	6,956	[1],[2],[3]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1	[1],[4]	4	[1],[4]	6	[1],[4]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	20	[1],[4]	9,925	[1],[4]	1,742	[1],[4]
Commercial real-estate | Residential construction	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	0	[1],[2],[3]	3	[1],[2],[3]	1	[1],[2],[3]
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	[1],[2],[3]	2,147	[1],[2],[3]	1,105	[1],[2],[3]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	[1],[4]	0	[1],[4]	0	[1],[4]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	[1],[4]	0	[1],[4]	0	[1],[4]
Commercial real-estate | Commercial construction	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	3	[1],[2],[3]	2	[1],[2],[3]	8	[1],[2],[3]
Financing Receivable, Modifications, Post-Modification Recorded Investment	6,120	[1],[2],[3]	622	[1],[2],[3]	12,140	[1],[2],[3]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	'	[1],[4]	2	[1],[4]	1	[1],[4]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	'	[1],[4]	622	[1],[4]	467	[1],[4]
Commercial real-estate | Land	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	3	[1],[2],[3]	17	[1],[2],[3]	7	[1],[2],[3]
Financing Receivable, Modifications, Post-Modification Recorded Investment	2,639	[1],[2],[3]	31,836	[1],[2],[3]	7,971	[1],[2],[3]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1	[1],[4]	2	[1],[4]	2	[1],[4]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	215	[1],[4]	3,786	[1],[4]	1,667	[1],[4]
Commercial real-estate | Office	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	4	[1],[2],[3]	0	[1],[2],[3]	9	[1],[2],[3]
Financing Receivable, Modifications, Post-Modification Recorded Investment	4,021	[1],[2],[3]	0	[1],[2],[3]	8,870	[1],[2],[3]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1	[1],[4]	0	[1],[4]	2	[1],[4]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1,648	[1],[4]	0	[1],[4]	2,239	[1],[4]
Commercial real-estate | Industrial	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	1	[1],[2],[3]	1	[1],[2],[3]	5	[1],[2],[3]
Financing Receivable, Modifications, Post-Modification Recorded Investment	949	[1],[2],[3]	727	[1],[2],[3]	5,334	[1],[2],[3]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	[1],[4]	0	[1],[4]	2	[1],[4]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	[1],[4]	0	[1],[4]	3,224	[1],[4]
Commercial real-estate | Retail	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	1	[1],[2],[3]	8	[1],[2],[3]	14	[1],[2],[3]
Financing Receivable, Modifications, Post-Modification Recorded Investment	200	[1],[2],[3]	13,518	[1],[2],[3]	19,113	[1],[2],[3]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	'	[1],[4]	1	[1],[4]	2	[1],[4]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	'	[1],[4]	3,607	[1],[4]	2,694	[1],[4]
Commercial real-estate | Multi-family	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	1	[1],[2],[3]	1	[1],[2],[3]	6	[1],[2],[3]
Financing Receivable, Modifications, Post-Modification Recorded Investment	705	[1],[2],[3]	380	[1],[2],[3]	4,415	[1],[2],[3]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1	[1],[4]	0	[1],[4]	0	[1],[4]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	705	[1],[4]	0	[1],[4]	0	[1],[4]
Commercial real-estate | Mixed use and other	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	6	[1],[2],[3]	15	[1],[2],[3]	33	[1],[2],[3]
Financing Receivable, Modifications, Post-Modification Recorded Investment	5,042	[1],[2],[3]	7,333	[1],[2],[3]	28,708	[1],[2],[3]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1	[1],[4]	4	[1],[4]	6	[1],[4]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	95	[1],[4]	1,445	[1],[4]	5,283	[1],[4]
Residential real estate and other	'		'		'
Financing Receivables, Modifications [Line Items]	'		'		'
Financing Receivable, Modifications, Number of Contracts	10	[1],[2],[3]	10	[1],[2],[3]	16	[1],[2],[3]
Financing Receivable, Modifications, Post-Modification Recorded Investment	2,296	[1],[2],[3]	1,638	[1],[2],[3]	5,916	[1],[2],[3]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	'	[1],[4]	5	[1],[4]	4	[1],[4]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	'	[1],[4]	$1,168	[1],[4]	$908	[1],[4]
[1]	Balances represent the recorded investment in the loan at the time of the restructuring.
[2]	Total TDRs represent all loans restructured in TDRs during the year indicated.
[3]	TDRs may have more than one modification representing a concession. As such, TDRs during the period may be represented in more than one of the categories noted above.
[4]	TDRs considered to be in payment default are over 30 days past-due subsequent to the restructuring.

Recovered_Sheet1

Allowance for Loan Losses Allowance for Losses on Lending-Related Commitments and Impaired Loans (Narrative) (Details) (USD $)	12 Months Ended						3 Months Ended	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011		Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012
	Loan		Loan		Loan		Financing Receivable [Member]	Financing Receivable [Member]	Financing Receivable [Member]
							Loan
Financing Receivable, Allowance for Credit Losses [Line Items]	'		'		'		'	'	'
Financing Receivable, Modifications, Post-Modification Recorded Investment	$22,680,000	[1],[2],[3]	$72,512,000	[1],[2],[3]	$100,528,000	[1],[2],[3]	'	'	'
Average recorded investment	170,658,000		222,076,000		247,100,000		'	'	'
Impaired Financing Receivable, Interest Income, Accrual Method	8,920,000		10,819,000		12,500,000		'	'	'
Financing Receivable, Modifications, Recorded Investment	'		126,473,000		'		'	107,103,000	'
Allowance for loan losses related to impaired loans	8,265,000		13,575,000		'		'	4,800,000	'
Loans and Leases Receivable, Impaired, Interest Income Recognized, Change in Present Value Attributable to Passage of Time	'		'		'		'	901,000	1,300,000
Financing Receivable, Modifications, Number of Contracts	35	[1],[2],[3]	75	[1],[2],[3]	123	[1],[2],[3]	149	'	'
Financing Receivables, Modifications, Weighted Average Extension Term	'18 months		'9 months		'11 months		'	'	'
Weighted Average Stated Interest Rate Basis Points	1.84%		1.57%		1.92%		'	'	'
Financing Receivables, Modifications, Weighted Average Interest Only Term	'11 months		'5 months		'9 months		'	'	'
Loan Forgiveness	$1,000,000		$800,000		$67,000		'	'	'
[1]	Balances represent the recorded investment in the loan at the time of the restructuring.
[2]	Total TDRs represent all loans restructured in TDRs during the year indicated.
[3]	TDRs may have more than one modification representing a concession. As such, TDRs during the period may be represented in more than one of the categories noted above.

Loan_Securitization_Narrative_

Loan Securitization (Narrative) (Details) (USD $)	3 Months Ended	12 Months Ended			0 Months Ended	3 Months Ended		0 Months Ended
	Sep. 30, 2009	Dec. 31, 2012	Dec. 31, 2013	Jun. 30, 2012	Aug. 15, 2012	Sep. 30, 2009	Sep. 11, 2009	Aug. 15, 2012	Dec. 31, 2013	Dec. 31, 2012
					Class A [Member]	Class A [Member]	Class A [Member]	Class B and C [Member]	Securitization Entity [Member]	Securitization Entity [Member]
Debt Instrument [Line Items]	'	'	'	'	'	'	'	'	'	'
Instruments issued by the securitization entity	'	'	'	'	'	'	$600,000,000	'	'	'
Class A notes annual interest rate of one-month LIBOR plus	'	'	'	'	'	1.45%	'	'	'	'
Debt Instrument, Description of Variable Rate Basis	'One-month LIBOR	'	'	'	'	'	'	'	'	'
Company repurchased notes	'	239,200,000	'	'	360,800,000	'	'	49,600,000	'	'
Secured borrowings - owed to securitization investors	'	0	0	360,800,000	'	'	'	'	'	'
Proceeds from secured debt intercompany	'	'	'	'	239,200,000	'	'	'	'	'
Loans and Leases Receivable, Gross	'	'	'	'	'	'	'	'	0	0
Other borrowings	'	274,411,000	254,740,000	'	'	'	'	'	0	0
Cash	'	'	'	'	'	'	'	'	'	$36,000

Mortgage_Servicing_Rights_Sche

Mortgage Servicing Rights (Schedule Of Changes In Carrying Value Of MSR) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Servicing Asset at Fair Value, Amount [Roll Forward]	'	'	'
Balance at beginning of year	$6,750	$6,700	$8,762
Additions from loans sold with servicing retained	523	4,151	2,611
Estimate of changes in fair value due to:	'	'	'
Payoffs and paydowns	-941	-3,808	-2,430
Changes in valuation inputs or assumptions	2,614	-293	-2,243
Fair value at end of year	8,946	6,750	6,700
Unpaid principal balance of mortgage loans serviced for others	$961,619	$1,005,372	$958,749

Business_Combinations_Summary_

Business Combinations (Summary of Acquisition of Certain Assets and the Assumption of Liabilities, of Six Financial Institutions in FDIC-Assisted Transactions) (Details) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Feb. 10, 2012		Jul. 20, 2012		Sep. 28, 2012
				Charter National [Member]		Second Federal [Member]		First United Bank [Member]
Business Acquisition [Line Items]	'	'	'	'		'		'
Date of acquisition	'	'	'	10-Feb-12		20-Jul-12	[1]	28-Sep-12
Fair value of assets acquired, at the acquisition date	'	'	'	$92,355,000		$171,625,000	[1]	$328,408,000
Fair value of loans acquired, at the acquisition date	'	'	'	45,555,000		0	[1]	77,964,000
Fair value of liabilities assumed, at the acquisition date	'	'	'	91,570,000		171,582,000	[1]	321,734,000
Fair value of reimbursable losses, at the acquisition date	85,672,000	208,160,000	344,251,000	13,164,000	[2]	0	[1],[2]	67,190,000	[2]
Gain on bargain purchase recognized	0	7,503,000	37,974,000	785,000		43,000	[1]	6,675,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Subject to Loss Sharing	'	'	'	'		$0		'
[1]	Subsequent to the acquisition of Second Federal, deposits and banking operations were divested to an unaffiliated financial institution. See "Divestiture of Previous FDIC-Assisted Acquisition" below for further discussion.
[2]	As no assets subject to loss sharing agreements were acquired in the acquisition of Second Federal, there was no fair value of reimbursable losses.

Business_Combinations_Summary_1

Business Combinations (Summary of FDIC Indemnification Asset) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
FDIC Indemnification Asset [Roll Forward]	'	'	'
Balance at beginning of period	$208,160	$344,251	'
Additions from acquisitions	0	80,354	'
Additions from reimbursable expenses	13,022	21,859	'
Amortization	-7,556	-7,209	'
Changes in expected reimbursements from the FDIC for changes in expected credit losses	-74,511	-61,406	'
Payments received from the FDIC	53,443	169,689	92,595
Balance at end of period	$85,672	$208,160	$344,251

Business_Combinations_Narrativ

Business Combinations (Narrative) (Details) (USD $)

12 Months Ended

24 Months Ended

0 Months Ended

1 Months Ended

0 Months Ended

0 Months Ended

12 Months Ended

0 Months Ended

12 Months Ended

0 Months Ended

12 Months Ended

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2011

Oct. 18, 2013

1-May-13

Dec. 12, 2012

Apr. 13, 2012

Mar. 30, 2012

Sep. 30, 2011

Sep. 29, 2011

Jun. 08, 2012

Jul. 02, 2011

Jun. 30, 2011

Oct. 02, 2013

Sep. 30, 2013

Apr. 13, 2011

Dec. 31, 2010

Feb. 03, 2011

Dec. 31, 2010

1-May-13

1-May-13

Feb. 01, 2013

segment

segment

financial_institution

Diamond

First Lansing Bancorp, Inc. [Member]

HPK Financial Corporation [Member]

Suburban Bank And Trust Company [Member]

Suburban Bank And Trust Company [Member]

Elgin State Bancorp Inc [Member]

Elgin State Bancorp Inc [Member]

Macquarie Premium Funding Inc [Member]

Great Lakes Advisors [Member]

Great Lakes Advisors [Member]

Surety Financial Services [Member]

Surety Financial Services [Member]

River City of Bloomington, Minnesota [Member]

River City of Bloomington, Minnesota [Member]

Woodfield of Rolling Meadows, Illinois [Member]

Woodfield of Rolling Meadows, Illinois [Member]

Chicago, Illinois [Member]

Northwest Indiana [Member]

Second Federal [Member]

locations

locations

locations

locations

locations

First Lansing Bancorp, Inc. [Member]

First Lansing Bancorp, Inc. [Member]

locations

locations

Business Acquisition [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of Reportable Segments

3

3

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Date of acquisition

'

'

'

18-Oct-13

1-May-13

12-Dec-12

13-Apr-12

30-Mar-12

30-Sep-11

'

8-Jun-12

1-Jul-11

'

1-Oct-13

'

13-Apr-11

'

3-Feb-11

'

'

'

'

Number of Locations

'

'

'

4

'

2

'

'

'

3

'

'

'

'

5

'

'

'

'

7

1

'

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets

'

'

'

$172,500,000

$373,400,000

$371,600,000

'

'

'

$263,200,000

'

'

$26,000,000

'

'

'

'

'

'

'

'

'

Fair value of loans acquired, at the acquisition date

'

'

'

91,700,000

123,000,000

118,500,000

3,000,000

'

'

146,700,000

213,000,000

'

'

'

'

'

'

'

'

'

'

'

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities

'

'

'

169,100,000

334,700,000

344,100,000

'

'

'

248,400,000

'

'

8,800,000

'

'

'

'

'

'

'

'

'

Fair value of deposits

'

'

'

140,200,000

331,400,000

243,800,000

52,000,000

'

'

241,100,000

'

'

'

'

'

'

'

'

'

'

'

'

Additional goodwill recorded on acquisition

31,846,000

'

'

8,400,000

14,000,000

12,600,000

1,500,000

1,800,000

5,000,000

'

21,900,000

15,700,000

'

9,500,000

'

'

'

'

'

'

'

'

Number of FDIC-assisted banks acquired

'

'

6

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

FDIC loss sharing percentage on purchased loans, OREO, and certain other assets

80.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Divestiture of Businesses, Deposits Disposed

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

149,000,000

Assets under management, carrying amount

'

'

'

'

'

'

'

160,000,000

'

'

'

'

2,400,000,000

'

'

'

'

'

'

'

'

'

Mortgage Loan Originations

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$1,000,000,000

'

$500,000,000

'

$180,000,000

'

'

'

Number of States in which Entity Operates

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5

'

'

'

'

'

'

Goodwill_and_Other_Intangible_2

Goodwill and Other Intangible Assets (Goodwill Assets by Business Segment) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013
Goodwill [Roll Forward]	'
1-Jan-13	$345,401
Goodwill Acquired	31,846
Impairment Loss	0
Goodwill Adjustments	-2,700
31-Dec-13	374,547
Community Banking [Member]	'
Goodwill [Roll Forward]	'
1-Jan-13	274,963
Goodwill Acquired	31,846
Impairment Loss	0
Goodwill Adjustments	-1,496
31-Dec-13	305,313
Specialty Finance [Member]	'
Goodwill [Roll Forward]	'
1-Jan-13	38,574
Goodwill Acquired	0
Impairment Loss	0
Goodwill Adjustments	-1,204
31-Dec-13	37,370
Wealth Management [Member]	'
Goodwill [Roll Forward]	'
1-Jan-13	31,864
Goodwill Acquired	0
Impairment Loss	0
Goodwill Adjustments	0
31-Dec-13	$31,864

Goodwill_and_Other_Intangible_3

Goodwill and Other Intangible Assets (Summary of Finite-Lived Intangible Assets) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Indefinite-lived Intangible Assets by Major Class [Line Items]	'	'
Total other intangible assets, net	$19,213	$20,947
Community Banking [Member] | Core Deposits [Member]	'	'
Indefinite-lived Intangible Assets by Major Class [Line Items]	'	'
Gross carrying amount	40,770	38,176
Accumulated amortization	-29,189	-25,159
Net carrying amount	11,581	13,017
Specialty Finance [Member] | Customer Lists [Member]	'	'
Indefinite-lived Intangible Assets by Major Class [Line Items]	'	'
Gross carrying amount	1,800	1,800
Accumulated amortization	-805	-645
Net carrying amount	995	1,155
Wealth Management [Member] | Customer List and Other Intangibles [Member]	'	'
Indefinite-lived Intangible Assets by Major Class [Line Items]	'	'
Gross carrying amount	7,690	7,390
Accumulated amortization	-1,053	-615
Net carrying amount	$6,637	$6,775

Goodwill_and_Other_Intangible_4

Goodwill and Other Intangible Assets (Estimated Amortization) (Details) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Goodwill and Intangible Assets Disclosure [Abstract]	'
Estimated - 2014	$4,369
Estimated - 2015	2,791
Estimated - 2016	2,180
Estimated - 2017	1,764
Estimated - 2018	$1,544

Goodwill_and_Other_Intangible_5

Goodwill and Other Intangible Assets Goodwill and Other Intangible Assets (Narrative) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Goodwill [Line Items]	'	'	'
Goodwill Acquired	$31,846	'	'
Goodwill Adjustments	-2,700	'	'
Amortization of intangible assets	4,627	4,324	3,425
Community Banking [Member]	'	'	'
Goodwill [Line Items]	'	'	'
Goodwill Acquired	31,846	'	'
Goodwill Adjustments	-1,496	'	'
Specialty Finance [Member]	'	'	'
Goodwill [Line Items]	'	'	'
Goodwill Acquired	0	'	'
Goodwill Adjustments	-1,204	'	'
Wealth Management [Member]	'	'	'
Goodwill [Line Items]	'	'	'
Goodwill Acquired	0	'	'
Goodwill Adjustments	$0	'	'
Core Deposits [Member] | Community Banking [Member]	'	'	'
Goodwill [Line Items]	'	'	'
Finite-lived intangibles, useful life	'10 years	'	'
Customer Lists [Member] | Specialty Finance [Member]	'	'	'
Goodwill [Line Items]	'	'	'
Finite-lived intangibles, useful life	'18 years	'	'
Customer Lists [Member] | Wealth Management [Member]	'	'	'
Goodwill [Line Items]	'	'	'
Finite-lived intangibles, useful life	'10 years	'	'

Premises_and_Equipment_Net_Sum

Premises and Equipment, Net (Summary of Premises and Equipment) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]	'	'
Premises and equipment, gross	$720,182	$666,227
Less: Accumulated depreciation and amortization	188,235	165,022
Total premises and equipment, net	531,947	501,205
Land	'	'
Property, Plant and Equipment [Line Items]	'	'
Premises and equipment, gross	116,906	105,427
Buildings and Leasehold Improvements [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Premises and equipment, gross	440,456	415,502
Furniture, Equipment, and Computer Software [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Premises and equipment, gross	144,854	134,945
Construction in Progress [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Premises and equipment, gross	$17,966	$10,353

Premises_and_Equipment_Net_Pre

Premises and Equipment, Net Premises and Equipment, Net (Narrative) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Abstract]	'	'	'
Depreciation, Depletion and Amortization	$26	$23.10	$19.10

Deposits_Summary_of_Deposits_D

Deposits (Summary of Deposits) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Deposits [Abstract]	'	'
Non-interest bearing, Balance	$2,721,771	$2,396,264
NOW, Balance	1,953,882	2,022,957
Wealth management deposits, Balance	1,013,850	991,902
Money market, Balance	3,359,999	2,761,498
Savings, Balance	1,392,575	1,275,012
Time certificates of deposit, Balance	4,226,712	4,980,911
Total deposits	$14,668,789	$14,428,544
Non-interest bearing, Mix	19.00%	17.00%
NOW, Mix	13.00%	14.00%
Wealth management deposits, Mix	7.00%	7.00%
Money market, Mix	23.00%	19.00%
Savings, Mix	9.00%	9.00%
Time certificates of deposit, Mix	29.00%	34.00%
Total deposits, Mix	100.00%	100.00%

Deposits_Schedule_of_Maturitie

Deposits (Schedule of Maturities of Time Certificates of Deposit) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Deposits [Abstract]	'	'
Due within one year	$2,640,757	$3,314,646
Due in one to two years	908,443	1,042,769
Due in two to three years	465,788	377,180
Due in three to four years	131,455	135,003
Due in four to five years	74,647	105,944
Due after five years	5,622	5,369
Total time certificates of deposit	$4,226,712	$4,980,911

Recovered_Sheet2

Deposits (Schedule Of Maturities of Time Deposits over $100,000) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Deposits [Abstract]	'	'
Maturing within three months	$584,948	$591,901
After three but within six months	395,118	719,425
After six but within 12 months	647,389	982,407
After 12 months	1,088,954	1,073,016
Total	$2,716,409	$3,366,749

Notes_Payable_Narrative_Detail

Notes Payable (Narrative) (Details) (USD $)

12 Months Ended

9 Months Ended

12 Months Ended

9 Months Ended

12 Months Ended

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Sep. 30, 2013

Sep. 30, 2013

Dec. 31, 2014

Dec. 31, 2013

Sep. 30, 2013

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Line of Credit [Member]

Line of Credit [Member]

Line of Credit [Member]

Notes Payable to Banks [Member]

Notes Payable to Banks [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Base Rate [Member]

Base Rate [Member]

Federal Funds Rate [Member]

Prime Rate [Member]

Eurodollar [Member]

London Interbank Offered Rate (LIBOR) [Member]

Base Rate Loan [Member]

Eurodollar Rate Loan [Member]

Base Rate Loan [Member]

Base Rate Loan [Member]

Base Rate Loan [Member]

Eurodollar Rate Loan [Member]

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum

'

'

'

'

'

'

'

'

'

'

'

'

3.50%

3.50%

'

'

'

'

Notes payable outstanding

$364,000

$2,093,000

'

'

'

'

$0

'

'

'

'

$1,100,000

'

'

'

'

'

'

Debt Instrument, Frequency of Periodic Payment

'

'

'

'

'

'quarterly

'

'

'

'quarterly

'

'

'

'

'

'

'

'

Debt Instrument, Interest Rate, Stated Percentage

'

'

'

'

'

'

'

'

'

'

1.25%

'

'

'

'

'

'

'

Loan agreement with unaffiliated banks, amount

'

'

'

101,000,000

'

'

'

1,000,000

'

'

'

'

'

'

'

'

'

'

Line of Credit Facility, Maximum Borrowing Capacity

'

'

'

'

100,000,000

'

100,000,000

'

'

'

'

'

'

'

'

'

'

'

Maturity date

'

'

'

'

25-Oct-13

'

6-Nov-14

1-Jun-15

'

30-Sep-14

'

'

'

'

'

'

'

'

(Decrease) increase in other borrowings, net

($22,396,000)

($306,786,000)

$226,050,000

'

'

'

'

'

$1,000,000

'

'

'

'

'

'

'

'

'

Debt Instrument, Basis Spread on Variable Rate

'

'

'

'

'

'

'

'

'

'

1.00%

'

'

'

1.00%

0.50%

1.50%

2.50%

Line of Credit Facility, Unused Capacity, Commitment Fee Percentage

'

'

'

'

'

'

0.38%

'

'

'

'

'

'

'

'

'

'

'

Federal_Home_Loan_Bank_Advance2

Federal Home Loan Bank Advances (Summary Of Outstanding FHLB Advances) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Federal Home Loan Bank, Advances, Branch Of FHLB Bank [Line Items]	'	'
Federal Home Loan Bank advances	$417,762	$414,122
1.45% Advance Due July 2013 [Member]	'	'
Federal Home Loan Bank, Advances, Branch Of FHLB Bank [Line Items]	'	'
Federal Home Loan Bank advances	0	26,000
Federal Home Loan Bank advances, Interest rate	1.45%	'
Federal Home Loan Bank advances, Due date	'2013	'
0.13% Advance Due January 2014 [Member]	'	'
Federal Home Loan Bank, Advances, Branch Of FHLB Bank [Line Items]	'	'
Federal Home Loan Bank advances	30,000	0
Federal Home Loan Bank advances, Interest rate	0.13%	'
Federal Home Loan Bank advances, Due date	'2014	'
1.94% Advance Due July 2014 [Member]	'	'
Federal Home Loan Bank, Advances, Branch Of FHLB Bank [Line Items]	'	'
Federal Home Loan Bank advances	10,000	10,000
Federal Home Loan Bank advances, Interest rate	1.94%	'
Federal Home Loan Bank advances, Due date	'2014	'
1.58% Advance Due September 2014 [Member]	'	'
Federal Home Loan Bank, Advances, Branch Of FHLB Bank [Line Items]	'	'
Federal Home Loan Bank advances	25,127	25,300
Federal Home Loan Bank advances, Interest rate	1.58%	'
Federal Home Loan Bank advances, Due date	'2014	'
1.63% Advance Due September 2014 [Member]	'	'
Federal Home Loan Bank, Advances, Branch Of FHLB Bank [Line Items]	'	'
Federal Home Loan Bank advances	25,135	25,322
Federal Home Loan Bank advances, Interest rate	1.63%	'
Federal Home Loan Bank advances, Due date	'2014	'
0.72% Advance Due Feburary 2015 [Member]	'	'
Federal Home Loan Bank, Advances, Branch Of FHLB Bank [Line Items]	'	'
Federal Home Loan Bank advances	141,000	141,000
Federal Home Loan Bank advances, Interest rate	0.72%	'
Federal Home Loan Bank advances, Due date	'2015	'
0.73% Advance Due Feburary 2015 [Member]	'	'
Federal Home Loan Bank, Advances, Branch Of FHLB Bank [Line Items]	'	'
Federal Home Loan Bank advances	5,000	5,000
Federal Home Loan Bank advances, Interest rate	0.73%	'
Federal Home Loan Bank advances, Due date	'2015	'
0.99% Advance Due February 2016 [Member]	'	'
Federal Home Loan Bank, Advances, Branch Of FHLB Bank [Line Items]	'	'
Federal Home Loan Bank advances	26,500	26,500
Federal Home Loan Bank advances, Interest rate	0.99%	'
Federal Home Loan Bank advances, Due date	'2016	'
1.25% Advance Due February 2017 [Member]	'	'
Federal Home Loan Bank, Advances, Branch Of FHLB Bank [Line Items]	'	'
Federal Home Loan Bank advances	25,000	25,000
Federal Home Loan Bank advances, Interest rate	1.25%	'
Federal Home Loan Bank advances, Due date	'2017	'
3.47% Advance Due November 2017 [Member]	'	'
Federal Home Loan Bank, Advances, Branch Of FHLB Bank [Line Items]	'	'
Federal Home Loan Bank advances	10,000	10,000
Federal Home Loan Bank advances, Interest rate	3.47%	'
Federal Home Loan Bank advances, Due date	'2017	'
1.49% Advance Due February 2018 [Member]	'	'
Federal Home Loan Bank, Advances, Branch Of FHLB Bank [Line Items]	'	'
Federal Home Loan Bank advances	95,000	95,000
Federal Home Loan Bank advances, Interest rate	1.49%	'
Federal Home Loan Bank advances, Due date	'2018	'
4.18% Advance Due February 2022 [Member]	'	'
Federal Home Loan Bank, Advances, Branch Of FHLB Bank [Line Items]	'	'
Federal Home Loan Bank advances	$25,000	$25,000
Federal Home Loan Bank advances, Interest rate	4.18%	'
Federal Home Loan Bank advances, Due date	'2022	'

Federal_Home_Loan_Bank_Advance3

Federal Home Loan Bank Advances (Narrative) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2013
		Rate
Federal Home Loan Bank, Advances, Activity for Year [Abstract]	'	'
Federal Home Loan Bank advances, Restructured advances	$292.50	'
Federal Home Loan Bank advances, Prepayment fees	22.4	'
Federal Home Loan Bank advances having varying call dates	'	35
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Weighted Average Interest Rate	'	1.31%
Federal Home Loan Bank Advances General Debt Obligations Disclosures Weighted Average Interest Rate Adjusted	'	1.22%
Federal Home Loan Bank advances, Additional borrowings possible	'	$771.10

Subordinated_Notes_Narrative_D

Subordinated Notes (Narrative) (Details) (USD $)

3 Months Ended

3 Months Ended

12 Months Ended

1 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

Sep. 30, 2009

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Sep. 30, 2012

Dec. 31, 2012

Nov. 30, 2013

Dec. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

subordinated_notes

subordinated_notes

Subordinated Note Due October Twenty Nine Two Thousand And Twelve [Member]

Subordinated Note Due October Twenty Nine Two Thousand And Twelve [Member]

Subordinated Note Due May Twenty Nine Two Thousand And Fifteen [Member]

Subordinated Note Due May Twenty Nine Two Thousand And Fifteen [Member]

Subordinated Note Due May Twenty Nine Two Thousand And Fifteen [Member]

Subordinated Note Due May One Two Thousand And Thirteen [Member]

Subordinated Note Due May One Two Thousand And Thirteen [Member]

Subordinated Debt [Member]

Subordinated Debt [Member]

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

Annual interest rate of subordinated notes

'One-month LIBOR

'

'

'

'

'

'

'

'

'

'

'LIBOR plus 130 basis points

'

Subordinated notes

'

$0

$15,000,000

'

'

'

'

'

$15,000,000

'

'

'

'

Debt Instrument, Maturity Date

'

'

'

'

'

'

'

31-May-15

'

'

'

'

'

Number of subordinated notes remaining

'

'

1

2

'

'

'

'

'

'

'

'

'

Debt Instrument, Issuance Date

'

'

'

'

'

31-Oct-02

'

31-Oct-05

'

'

30-Apr-03

'

'

Repayment of subordinated notes

'

'

'

'

5,000,000

'

10,000,000

'

'

10,000,000

'

'

'

Debt Instrument, Basis Spread on Variable Rate

'

'

'

'

'

'

'

'

'

'

'

1.30%

'

Weighted average contractual interest rate

'

'

'

'

'

'

'

'

'

'

'

'

1.61%

Debt issuance costs

'

'

'

'

'

'

'

'

'

'

'

1,000,000

'

Debt Instrument, Unamortized Discount

'

'

'

'

'

'

'

'

'

'

'

'

$3,000

Other_Borrowings_Summary_Of_Ot

Other Borrowings (Summary Of Other Borrowings) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 07, 2010
In Thousands, unless otherwise specified
Other Borrowings [Abstract]	'	'	'	'
Securities sold under repurchase agreements	$235,347	$238,401	'	'
Other	19,393	36,010	'	'
Secured borrowings - owed to securitization investors	0	0	360,800	'
Total other borrowings	$254,740	$274,411	'	'
Tangible Equity Unit Components	'	'	'	2

Other_Borrowings_Narrative_Det

Other Borrowings (Narrative) (Details) (USD $)

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Mar. 15, 2011

Dec. 31, 2013

Dec. 31, 2010

Dec. 15, 2013

Dec. 07, 2010

Sep. 30, 2009

Dec. 31, 2012

Master Repurchase Agreements [Member]

Master Repurchase Agreements [Member]

Banks And Brokers [Member]

Banks And Brokers [Member]

Fixed Rate Promissory Note [Member]

Junior Subordinated Debt [Member]

Junior Subordinated Debt [Member]

Junior Subordinated Debt [Member]

Junior Subordinated Debt [Member]

Junior Subordinated Debt [Member]

Secured Debt [Member]

Secured Debt [Member]

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Securities sold under repurchase agreements

$235,347,000

$238,401,000

$55,300,000

$55,000,000

$180,000,000

$183,400,000

'

'

'

'

'

'

'

'

Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements

'

'

60,000,000

'

191,300,000

'

'

'

'

'

'

'

'

'

Net Credit Exposure Repurchase Agreements

0

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Issuance Date

'

'

'

'

'

'

31-Aug-12

'

31-Dec-10

'

'

'

'

'

Other

19,393,000

36,010,000

'

'

'

'

19,300,000

'

'

'

'

'

'

'

Debt Instrument, Frequency of Periodic Payment

'

'

'

'

'

'

'monthly

'

'quarterly

'quarterly

'

'

'

'

Fixed interest rate

'

'

'

'

'

'

3.75%

'

'

'

9.50%

9.50%

'

'

Maturity date

'

'

'

'

'

'

1-Sep-17

'

15-Dec-13

15-Dec-13

'

'

'

'

Junior subordinated notes

'

'

'

'

'

'

'

'

'

'

'

44,700,000

'

'

Quarterly principal and interest payments

'

'

'

'

'

'

'

'

4,300,000

'

'

'

'

'

Debt Instrument, Initial Payment

'

'

'

'

'

'

'

4,600,000

'

'

'

'

'

'

Instruments issued by the securitization entity

'

'

'

'

'

'

'

'

'

'

'

'

600,000,000

'

Class A notes annual interest rate of one-month LIBOR plus

'

'

'

'

'

'

'

'

'

'

'

'

1.45%

'

Amount of the Notes purchased in the open market

'

'

'

'

'

'

'

'

'

'

'

'

'

$239,200,000

Junior_Subordinated_Debentures2

Junior Subordinated Debentures (Summary of the Company's Junior Subordinated Debentures) (Details) (USD $)

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Sep. 14, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2010

Dec. 15, 2013

Dec. 07, 2010

In Thousands, unless otherwise specified

Wintrust Capital Trust Three [Member]

Wintrust Capital Trust Three [Member]

Wintrust Statutory Trust Four [Member]

Wintrust Statutory Trust Four [Member]

Wintrust Statutory Trust Five [Member]

Wintrust Statutory Trust Five [Member]

Wintrust Capital Trust Seven [Member]

Wintrust Capital Trust Seven [Member]

Wintrust Capital Trust Eight [Member]

Wintrust Capital Trust Eight [Member]

Wintrust Captial Trust Nine [Member]

Wintrust Captial Trust Nine [Member]

Wintrust Captial Trust Nine [Member]

Northview Capital Trust One [Member]

Northview Capital Trust One [Member]

Town Bankshares Capital Trust One [Member]

Town Bankshares Capital Trust One [Member]

First Northwest Capital Trust One [Member]

First Northwest Capital Trust One [Member]

Junior Subordinated Debt [Member]

Junior Subordinated Debt [Member]

Junior Subordinated Debt [Member]

Junior Subordinated Debt [Member]

Rate

Rate

Rate

Rate

Rate

Rate

Rate

Rate

Rate

Rate

Subordinated Borrowing [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common securities

'

'

$774

'

$619

'

$1,238

'

$1,550

'

$1,238

'

$1,547

'

'

$186

'

$186

'

$155

'

'

'

'

'

Trust preferred securities

'

'

25,000

'

20,000

'

40,000

'

50,000

'

40,000

'

50,000

'

'

6,000

'

6,000

'

5,000

'

'

'

'

'

Junior subordinated debentures

$249,493

$249,493

$25,774

$25,774

$20,619

$20,619

$41,238

$41,238

$51,550

$51,550

$41,238

$41,238

$51,547

$51,547

'

$6,186

$6,186

$6,186

$6,186

$5,155

$5,155

'

'

'

'

Rate structure

'

'

'L+3.25

'

'L+2.80

'

'L+2.60

'

'L+1.95

'

'L+1.45

'

'L+1.63

'

'

'L+3.00

'

'L+3.00

'

'L+3.00

'

'

'

'

'

Debt Instrument, Basis Spread on Variable Rate

'

'

3.25%

'

2.80%

'

2.60%

'

1.95%

'

1.45%

'

1.63%

'

'

3.00%

'

3.00%

'

3.00%

'

'

'

'

'

Debt Instrument, Interest Rate, Stated Percentage

'

'

3.49%

'

3.05%

'

2.85%

'

2.19%

'

1.70%

'

1.87%

'

6.84%

3.24%

'

3.24%

'

3.25%

'

'

'

9.50%

9.50%

Weighted average interest rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2.43%

'

'

'

Issue date

'

'

30-Apr-03

'

31-Dec-03

'

31-May-04

'

31-Dec-04

'

31-Aug-05

'

30-Sep-06

'

'

31-Aug-03

'

31-Aug-03

'

31-May-04

'

31-Dec-10

'

'

'

Maturity date

'

'

30-Apr-33

'

31-Dec-33

'

31-May-34

'

31-Mar-35

'

30-Sep-35

'

30-Sep-36

'

'

30-Nov-33

'

30-Nov-33

'

31-May-34

'

15-Dec-13

15-Dec-13

'

'

Debt Instrument, Redemption Period, Start Date

'

'

30-Apr-08

'

31-Dec-08

'

30-Jun-09

'

31-Mar-10

'

30-Sep-10

'

30-Sep-11

'

'

31-Aug-08

'

31-Aug-08

'

31-May-09

'

'

'

'

'

Junior_Subordinated_Debentures3

Junior Subordinated Debentures (Narrative) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Sep. 14, 2011	Dec. 31, 2013	Dec. 15, 2013	Dec. 07, 2010	Jun. 30, 2013	Jun. 30, 2013
In Thousands, unless otherwise specified			Wintrust Captial Trust Nine [Member]	Wintrust Captial Trust Nine [Member]	Wintrust Captial Trust Nine [Member]	Junior Subordinated Debt [Member]	Junior Subordinated Debt [Member]	Junior Subordinated Debt [Member]	Forward Starting Interest Rate Cap [Member]	Interest Rate Swap [Member]
			Rate			Rate
Subordinated Borrowing [Line Items]	'	'	'	'	'	'	'	'	'	'
Percentage ownership interest in subsidiary trusts	100.00%	'	'	'	'	'	'	'	'	'
Common securities, approximate percentage of junior subordinated debentures	3.00%	'	'	'	'	'	'	'	'	'
Trust preferred securities, approximate percentage of junior subordinated debentures	97.00%	'	'	'	'	'	'	'	'	'
Junior subordinated debentures	$249,493	$249,493	$51,547	$51,547	'	'	'	'	'	'
Debt Instrument, Interest Rate, Stated Percentage	'	'	1.87%	'	6.84%	'	9.50%	9.50%	'	'
Debt Instrument, Basis Spread on Variable Rate	'	'	1.63%	'	'	'	'	'	'	'
Interest rate on junior subordinated debentures	'	'	'	'	'	2.43%	'	'	'	'
Interest rate swaps to hedge variable cash flows	$225,000	'	'	'	'	'	'	'	$90,000	'
Number of Derivative Contracts	'	'	'	'	'	'	'	'	2	2
Derivative, Maturity Date	'	'	'	'	'	'	'	'	'	30-Sep-13
Debt, Hedge Adjusted Weighted Average Interest Rate	3.21%	'	'	'	'	'	'	'	'	'
Consecutive quarters of deferred payment	20	'	'	'	'	'	'	'	'	'

Minimum_Lease_Commitments_Appr

Minimum Lease Commitments (Approximate Minimum Annual Gross Rental Payments And Gross Rental Income) (Details) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Leases [Abstract]	'
2014 - Payments	$5,112
2015 - Payments	5,180
2016 - Payments	4,852
2017 - Payments	4,343
2018 - Payments	3,693
2019 and thereafter - Payments	9,851
Total minimum future amounts - Payments	33,031
2014 - Income	5,089
2015 - Income	4,941
2016 - Income	4,248
2017 - Income	3,636
2018 - Income	3,025
2019 and thereafter - Income	4,330
Total minimum future amounts - Income	$25,269

Minimum_Lease_Commitments_Narr

Minimum Lease Commitments (Narrative) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Leases [Abstract]	'	'	'
Operating Leases, Rent Expense, Net	$9.10	$7.90	$7.90
Operating Leases, Income Statement, Lease Revenue	$7	$4.70	$3.80

Income_Taxes_Income_Tax_Expens

Income Taxes (Income Tax Expense (Benefit)) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current income taxes:	'	'	'	'	'	'	'	'	'	'	'
Federal	'	'	'	'	'	'	'	'	$67,449	$74,109	$40,312
State	'	'	'	'	'	'	'	'	16,046	16,224	10,785
Foreign	'	'	'	'	'	'	'	'	2,196	1,918	0
Total current income taxes	'	'	'	'	'	'	'	'	85,691	92,251	51,097
Deferred income taxes:	'	'	'	'	'	'	'	'	'	'	'
Federal	'	'	'	'	'	'	'	'	1,813	-19,550	-555
State	'	'	'	'	'	'	'	'	-114	-4,206	-84
Foreign	'	'	'	'	'	'	'	'	-160	441	0
Total deferred income taxes	'	'	'	'	'	'	'	'	1,539	-23,315	-639
Total income tax expense	$22,534	$22,519	$21,943	$20,234	$18,782	$19,871	$15,734	$14,549	$87,230	$68,936	$50,458

Income_Taxes_Reconciliation_of

Income Taxes (Reconciliation of the Differences Between Taxes Computed Using the Statutory Federal Income Tax Rate and Actual Income Tax Expense) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Income tax expense based upon the Federal statutory rate on income before income taxes	'	'	'	'	'	'	'	'	$78,554	$63,046	$44,812
Increase (decrease) in tax resulting from:	'	'	'	'	'	'	'	'	'	'	'
Tax-exempt interest, net of interest expense disallowance	'	'	'	'	'	'	'	'	-1,423	-1,294	-1,139
State taxes, net of federal tax benefit	'	'	'	'	'	'	'	'	10,355	7,811	6,955
Income earned on bank owned life insurance	'	'	'	'	'	'	'	'	-1,157	-974	-854
Non-deductible compensation costs	'	'	'	'	'	'	'	'	654	1,156	644
Meals, entertainment and related expenses	'	'	'	'	'	'	'	'	993	931	802
Foreign subsidiary, net	'	'	'	'	'	'	'	'	588	1,991	0
Foreign tax credits	'	'	'	'	'	'	'	'	0	-2,177	0
Tax credits	'	'	'	'	'	'	'	'	-1,553	-1,906	-562
Other, net	'	'	'	'	'	'	'	'	219	352	-200
Total income tax expense	$22,534	$22,519	$21,943	$20,234	$18,782	$19,871	$15,734	$14,549	$87,230	$68,936	$50,458

Income_Taxes_Deferred_Tax_Asse

Income Taxes (Deferred Tax Assets And Liabilities) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Deferred tax assets:	'	'
Allowance for credit losses	$37,525	$42,480
Net unrealized losses on derivatives included in other comprehensive income	1,574	3,442
Net unrealized losses on securities included in other comprehensive income	35,216	0
Deferred compensation	16,089	7,453
Stock-based compensation	10,340	11,333
Nonaccrued interest	1,895	3,053
Other real estate owned	6,405	9,193
Mortgage banking recourse obligation	1,503	1,706
Covered assets	13,616	7,527
Pension plan liabilities	1,035	916
Federal net operating loss carryforward	2,452	0
AMT credt carryforward	1,346	345
State tax losses carryforward	3,294	130
Foreign tax credit carryfoward	0	1,042
Other	2,149	2,072
Total gross deferred tax assets	134,439	90,692
Deferred tax liabilities:	'	'
Discount on purchased loans	5,718	27,458
Premises and equipment	36,847	29,725
Goodwill and intangible assets	1,683	338
Deferred loan fees and costs	4,533	4,487
FHLB stock dividends	1,431	1,610
Capitalized servicing rights	3,547	2,670
Net unrealized gains on securities included in other comprehensive income	0	4,336
Fair value adjustments on loans	6,947	6,634
Other	3,606	2,680
Total gross deferred liabilities	64,312	79,938
Valuation allowance	0	1,042
Net deferred tax assets	$70,127	$9,712

Income_Taxes_Narrative_Details

Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Loss Carryforwards [Line Items]	'	'	'
Tax benefits from stock-based compensation arrangements	$831,000	($1,392,000)	($129,000)
Statutory federal income tax rate	35.00%	'	'
AMT credt carryforward	1,346,000	345,000	'
Unrecognized Tax Benefits	0	'	'
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	0	'	'
Domestic Tax Authority [Member]	'	'	'
Operating Loss Carryforwards [Line Items]	'	'	'
Operating Loss Carryforwards	7,000,000	'	'
State and Local Jurisdiction [Member]	'	'	'
Operating Loss Carryforwards [Line Items]	'	'	'
Operating Loss Carryforwards	$53,300,000	'	'

Stock_Compensation_Plans_and_O2

Stock Compensation Plans and Other Employee Benefit Plans (Weighted Average Assumptions Used To Determine The Options Fair Value) (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation [Abstract]	'	'	'
Expected dividend yield	0.50%	0.60%	0.50%
Expected volatility	59.00%	62.60%	61.80%
Risk-free rate	1.00%	0.70%	1.00%
Expected option life (in years)	'4 years 6 months	'4 years 6 months	'4 years 4 months 24 days

Stock_Compensation_Plans_and_O3

Stock Compensation Plans and Other Employee Benefit Plans Stock Compensation Plans and Other Employee Benefit Plans (Summary of Stock Option Activity) (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Stock Options Outstanding [Roll Forward]	'		'		'
Outstanding at beginning of the period	1,745,427		2,064,534		2,040,701
Granted	236,120		250,997		221,003
Exercised	-371,826		-484,709		-85,706
Forfeited or canceled	-85,049		-85,395		-111,464
Outstanding at end of the period	1,524,672		1,745,427		2,064,534
Exercisable	1,097,836		1,346,287		1,779,218
Vested or expected to vest	1,522,161		'		'
Stock Options, Weighted Average Strike Price [Roll Forward]	'		'		'
Outstanding at beginning of the period	$42.31		$38.83		$38.92
Granted	$38.01		$31.16		$33.15
Exercised	$40.46		$21.43		$17.20
Forfeited or canceled	$44.12		$43.70		$46.01
Outstanding at end of the period	$42		$42.31		$38.83
Exercisable	$44.82		$45.57		$39.93
Vested or expected to vest	$42.02		'		'
Stock Options Additional Disclosures	'		'		'
Outstanding, Remaining Contractual Term	'2 years 7 months 6 days	[1]	'3 years 1 month 6 days	[1]	'2 years 8 months 12 days	[1]
Outstanding, Intrinsic Value	$11,021	[2]	$3,836	[2]	$3,809	[2]
Exercisable, Remaining Contractual Term	'1 year 6 months	[1]	'2 years 3 months 18 days	[1]	'2 years 3 months 18 days	[1]
Exercisable, Intrinsic Value	$6,165	[2]	$1,677	[2]	$3,558	[2]
[1]	Represents the weighted average contractual remaining life in years.
[2]	Aggregate intrinsic value represents the total pretax intrinsic value (i.e., the difference between the Companybs stock price at year end and the option exercise price, multiplied by the number of shares) that would have been received by the option holders if they had exercised their options on the last day of the year. Options with exercise prices above the year end stock price are excluded from the calculation of intrinsic value. The intrinsic value will change based on the fair market value of the Companybs stock.

Stock_Compensation_Plans_and_O4

Stock Compensation Plans and Other Employee Benefit Plans Stock Compensation Plans and Other Employee Benefit Plans (Summary of Plans' Restricted Share Award Activity) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Restricted Stock [Member]	'	'	'
Non-Option Equity Instruments Outstanding [Roll Forward]	'	'	'
Outstanding at the beginning of period	314,226	336,709	299,040
Granted	16,932	111,207	98,394
Vested and issued	-144,860	-132,337	-56,641
Forfeited	-4,776	-1,353	-4,084
Outstanding at the end of period	181,522	314,226	336,709
Non-Options Equity Instruments Outstanding, Weighted Average Grant Date Fair Value [Roll Forward]	'	'	'
Outstanding at beginning of the period	$37.99	$38.29	$39.44
Granted	$42.14	$32.37	$32.85
Vested and issued	$31.83	$34.12	$35.17
Forfeited	$33.93	$30.99	$34.73
Outstanding at end of the period	$43.39	$37.99	$38.29
Vested, but not issuable, Common Shares	85,000	85,000	85,000
Vested, but not issuable, Weighted Average Grant-Date Fair Value	$51.88	$51.88	$51.88
Performance Shares [Member]	'	'	'
Non-Option Equity Instruments Outstanding [Roll Forward]	'	'	'
Outstanding at the beginning of period	153,915	72,158	0
Granted	106,268	119,476	100,993
Vested and issued	0	0	0
Net decrease due to estimated performance	-106,005	-33,147	-28,062
Forfeited	-10,322	-4,572	-773
Outstanding at the end of period	143,856	153,915	72,158
Non-Options Equity Instruments Outstanding, Weighted Average Grant Date Fair Value [Roll Forward]	'	'	'
Outstanding at beginning of the period	$31.78	$33.25	$0
Granted	$37.90	$31.10	$33.25
Vested and issued	$0	$0	$0
Net decrease due to estimated performance	$34.17	$32.50	$33.25
Forfeited	$34.19	$31.98	$33.28
Outstanding at end of the period	$34.37	$31.78	$33.25

Stock_Compensation_Plans_and_O5

Stock Compensation Plans and Other Employee Benefit Plans (Narrative) (Details) (USD $)

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

31-May-12

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2010

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2010

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

31-May-11

31-May-09

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Jan. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Rate

Restricted Stock [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Performance Shares [Member]

Performance Shares [Member]

Performance Shares [Member]

Performance Shares [Member]

Minimum [Member]

HPK Financial Corporation [Member]

Diamond

Two Thousand And Seven Plan [Member]

Two Thousand And Seven Plan [Member]

Two Thousand And Seven Plan [Member]

Two Thousand And Seven Plan [Member]

Two Thousand And Seven Plan [Member]

Two Thousand And Seven Plan [Member]

Two Thousand And Seven Plan [Member]

Two Thousand And Seven Plan [Member]

Two Thousand And Seven Plan [Member]

Two Thousand And Seven Plan [Member]

Two Thousand And Seven Plan [Member]

Two Thousand And Seven Plan [Member]

Two Thousand And Seven Plan [Member]

Two Thousand And Seven Plan [Member]

Two Thousand And Seven Plan [Member]

Two Thousand And Seven Plan [Member]

Nineteen Ninety Seven Plan [Member]

Cash Incentive And Retention Plan [Member]

Cash Incentive And Retention Plan [Member]

Cash Incentive And Retention Plan [Member]

Cash Incentive And Retention Plan [Member]

Directors Deferred Fee And Stock Plan [Member]

Directors Deferred Fee And Stock Plan [Member]

Directors Deferred Fee And Stock Plan [Member]

Rate

Employee Stock Option [Member]

Employee Stock Option [Member]

Employee Stock Option [Member]

Ltip Awards [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Performance Shares [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

Maximum [Member]

Maximum [Member]

Employee Stock Option [Member]

Employee Stock Option [Member]

Ltip Awards [Member]

Restricted Stock [Member]

Performance Shares [Member]

Employee Stock Option [Member]

Ltip Awards [Member]

Restricted Stock [Member]

Performance Shares [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Additionally Authorized

'

'

'

300,000

'

'

'

'

'

'

'

'

'

'

'

'

2,860,000

325,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

752,491

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

66,282

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period

'3 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'3 years

'

'

'

'

'3 years

'

'1 year

'

'5 years

'

'5 years

'

'

'

'

'

'

'

'

'

Share Based Compensation By Share Based Payment Award Options Term

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'7 years

'

'

'7 years

'

'

'

'

'

'

'

'

'

'

'

'

'10 years

'

'

'

'

'

'

'

Percentage Of Performance Based Award Payouts

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

100.00%

'

0.00%

'

0.00%

'

200.00%

'

200.00%

'

'

'

'

'

'

'

'

Allocated Share-based Compensation Expense

$6,700,000

$9,100,000

$5,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Employee Service Share-based Compensation, Tax Benefit from Compensation Expense

2,500,000

3,300,000

1,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

329,000

15,000

-72,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value

$17.49

$15

$15.84

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value

1,200,000

5,400,000

1,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options

485,000

2,100,000

468,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options

15,000,000

10,400,000

1,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition

'2 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Maximum number of shares that could be issued based on the grants made to date

'

'

'

'

181,522

314,226

336,709

299,040

143,856

153,915

72,158

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

615,000

'

'

'

'

'

'

'

'

Weighted average grant date fair value per share of options granted (in usd per share)

'

'

'

'

$42.14

$32.37

$32.85

'

$37.90

$31.10

$33.25

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Shares granted to certain executives

'

'

'

'

16,932

111,207

98,394

'

106,268

119,476

100,993

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized

8,700,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value

7,400,000

6,400,000

4,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Deferred Compensation Arrangement with Individual, Compensation Expense

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

115,000

357,000

295,000

'

'

'

'

Deferred Compensation Arrangement with Individual, Distributions Paid

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

1,200,000

'

473,000

'

'

'

Defined Contribution Plan, Employer Discretionary Contribution Amount

4,900,000

4,300,000

4,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Employee Stock Ownership Plan (ESOP), Percent of Purchased Price to Fair Market Value Per Share

90.00%

'

'

'

'

'

'

'

'

'

'

'

85.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Employee Stock Ownership Plan (ESOP), Shares Contributed to ESOP

62,096

66,237

71,077

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Employee Stock Ownership Plan (ESOP), Compensation Expense

355,000

421,000

300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Employee Stock Ownership Plan (ESOP), Number of Committed-to-be-Released Shares

13,012

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Employee Stock Ownership Plan (ESOP), Shares in ESOP

259,020

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Defined Benefit Plan, Number Of Participants

'

'

'

'

'

'

'

'

'

'

'

'

'

100

35

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Defined Benefit Plan, Benefit Obligation

'

'

'

'

'

'

'

'

'

'

'

'

'

6,700,000

3,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Defined Benefit Plan, Fair Value of Plan Assets

'

'

'

'

'

'

'

'

'

'

'

'

'

$5,900,000

$2,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Deferred Compensation Arrangement with Individual, Shares Issued

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

30,547

22,220

25,242

Deferred Compensation Arrangement with Individual, Common Stock Reserved for Future Issuance

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

251,523

'

'

Regulatory_Matters_Schedule_of

Regulatory Matters (Schedule of Compliance with Minimum Capital Requirements) (Details)	Dec. 31, 2013	Dec. 31, 2012
Regulatory Capital Requirements [Abstract]	'	'
Total Capital to Risk Weighted Assets	12.90%	13.10%
Tier 1 Capital to Risk Weighted Assets	12.20%	12.10%
Tier 1 Leverage Ratio	10.50%	10.00%

Regulatory_Matters_Schedule_of1

Regulatory Matters (Schedule of Actual Capital Amounts and Ratios) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]	'	'
Total Capital to Risk Weighted Assets, Ratio	12.90%	13.10%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	10.00%	'
Tier 1 Capital to Risk Weighted Assets, Ratio	12.20%	12.10%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.00%	'
Tier 1 Leverage Ratio	10.50%	10.00%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	'
Lake Forest Bank [Member]	'	'
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]	'	'
Total Capital to Risk Weighted Assets, Amount	236,055	226,234
Total Capital to Risk Weighted Assets, Ratio	11.70%	11.00%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	202,443	205,188
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	10.00%	10.00%
Tier 1 Capital (to Risk Weighted Assets), Amount	222,577	209,699
Tier 1 Capital to Risk Weighted Assets, Ratio	11.00%	10.20%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	121,466	123,113
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.00%	6.00%
Tier 1 Leverage Ratio, Amount	222,577	209,699
Tier 1 Leverage Ratio	9.60%	8.80%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	116,340	119,601
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
Hinsdale Bank [Member]	'	'
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]	'	'
Total Capital to Risk Weighted Assets, Amount	152,266	154,677
Total Capital to Risk Weighted Assets, Ratio	11.40%	12.20%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	134,106	126,837
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	10.00%	10.00%
Tier 1 Capital (to Risk Weighted Assets), Amount	144,196	145,380
Tier 1 Capital to Risk Weighted Assets, Ratio	10.80%	11.50%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	80,463	76,102
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.00%	6.00%
Tier 1 Leverage Ratio, Amount	144,196	145,380
Tier 1 Leverage Ratio	9.50%	8.70%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	75,822	83,238
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
North Shore Community Bank [Member]	'	'
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]	'	'
Total Capital to Risk Weighted Assets, Amount	232,454	202,823
Total Capital to Risk Weighted Assets, Ratio	11.60%	11.50%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	200,806	176,124
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	10.00%	10.00%
Tier 1 Capital (to Risk Weighted Assets), Amount	162,903	145,488
Tier 1 Capital to Risk Weighted Assets, Ratio	8.10%	8.30%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	120,484	105,675
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.00%	6.00%
Tier 1 Leverage Ratio, Amount	162,903	145,488
Tier 1 Leverage Ratio	7.20%	7.20%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	113,580	101,553
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
Libertyville Bank [Member]	'	'
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]	'	'
Total Capital to Risk Weighted Assets, Amount	111,396	116,818
Total Capital to Risk Weighted Assets, Ratio	11.40%	11.90%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	97,777	97,880
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	10.00%	10.00%
Tier 1 Capital (to Risk Weighted Assets), Amount	103,895	105,251
Tier 1 Capital to Risk Weighted Assets, Ratio	10.60%	10.80%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	58,666	58,728
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.00%	6.00%
Tier 1 Leverage Ratio, Amount	103,895	105,251
Tier 1 Leverage Ratio	9.20%	8.90%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	56,703	59,379
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
Barrington Bank [Member]	'	'
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]	'	'
Total Capital to Risk Weighted Assets, Amount	128,924	148,382
Total Capital to Risk Weighted Assets, Ratio	11.00%	13.50%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	117,103	109,526
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	10.00%	10.00%
Tier 1 Capital (to Risk Weighted Assets), Amount	122,664	140,037
Tier 1 Capital to Risk Weighted Assets, Ratio	10.50%	12.80%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	70,262	65,716
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.00%	6.00%
Tier 1 Leverage Ratio, Amount	122,664	140,037
Tier 1 Leverage Ratio	8.90%	9.70%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	69,270	72,531
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
Crystal Lake Bank [Member]	'	'
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]	'	'
Total Capital to Risk Weighted Assets, Amount	85,922	84,310
Total Capital to Risk Weighted Assets, Ratio	13.00%	14.50%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	66,066	58,091
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	10.00%	10.00%
Tier 1 Capital (to Risk Weighted Assets), Amount	79,878	77,962
Tier 1 Capital to Risk Weighted Assets, Ratio	12.10%	13.40%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	39,640	34,855
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.00%	6.00%
Tier 1 Leverage Ratio, Amount	79,878	77,962
Tier 1 Leverage Ratio	10.20%	10.30%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	39,108	37,971
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
Northbrook Bank [Member]	'	'
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]	'	'
Total Capital to Risk Weighted Assets, Amount	142,512	139,603
Total Capital to Risk Weighted Assets, Ratio	11.00%	12.20%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	130,208	114,057
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	10.00%	10.00%
Tier 1 Capital (to Risk Weighted Assets), Amount	131,591	125,192
Tier 1 Capital to Risk Weighted Assets, Ratio	10.10%	11.00%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	78,125	68,434
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.00%	6.00%
Tier 1 Leverage Ratio, Amount	131,591	125,192
Tier 1 Leverage Ratio	8.10%	7.50%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	80,876	83,244
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
Schaumburg Bank [Member]	'	'
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]	'	'
Total Capital to Risk Weighted Assets, Amount	70,728	68,305
Total Capital to Risk Weighted Assets, Ratio	11.40%	11.80%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	62,130	57,946
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	10.00%	10.00%
Tier 1 Capital (to Risk Weighted Assets), Amount	64,263	62,538
Tier 1 Capital to Risk Weighted Assets, Ratio	10.30%	10.80%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	37,278	34,768
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.00%	6.00%
Tier 1 Leverage Ratio, Amount	64,263	62,538
Tier 1 Leverage Ratio	9.00%	8.70%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	35,571	36,061
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
Village Bank [Member]	'	'
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]	'	'
Total Capital to Risk Weighted Assets, Amount	95,359	92,787
Total Capital to Risk Weighted Assets, Ratio	11.00%	11.50%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	86,435	80,441
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	10.00%	10.00%
Tier 1 Capital (to Risk Weighted Assets), Amount	88,961	86,435
Tier 1 Capital to Risk Weighted Assets, Ratio	10.30%	10.70%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	51,861	48,265
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.00%	6.00%
Tier 1 Leverage Ratio, Amount	88,961	86,435
Tier 1 Leverage Ratio	9.40%	9.00%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	47,549	48,068
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
Beverly Bank [Member]	'	'
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]	'	'
Total Capital to Risk Weighted Assets, Amount	70,754	61,994
Total Capital to Risk Weighted Assets, Ratio	11.20%	11.10%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	63,251	55,697
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	10.00%	10.00%
Tier 1 Capital (to Risk Weighted Assets), Amount	65,385	59,440
Tier 1 Capital to Risk Weighted Assets, Ratio	10.30%	10.70%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	37,951	33,418
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.00%	6.00%
Tier 1 Leverage Ratio, Amount	65,385	59,440
Tier 1 Leverage Ratio	8.80%	12.30%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	37,281	24,127
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
Town Bank [Member]	'	'
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]	'	'
Total Capital to Risk Weighted Assets, Amount	85,647	83,144
Total Capital to Risk Weighted Assets, Ratio	11.20%	11.50%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	76,234	72,373
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	10.00%	10.00%
Tier 1 Capital (to Risk Weighted Assets), Amount	79,843	76,824
Tier 1 Capital to Risk Weighted Assets, Ratio	10.50%	10.60%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	45,741	43,424
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.00%	6.00%
Tier 1 Leverage Ratio, Amount	79,843	76,824
Tier 1 Leverage Ratio	9.50%	9.40%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	42,164	40,671
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
Wheaton Bank [Member]	'	'
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]	'	'
Total Capital to Risk Weighted Assets, Amount	77,177	71,097
Total Capital to Risk Weighted Assets, Ratio	13.00%	13.60%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	59,354	52,450
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	10.00%	10.00%
Tier 1 Capital (to Risk Weighted Assets), Amount	69,730	64,509
Tier 1 Capital to Risk Weighted Assets, Ratio	11.80%	12.30%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	35,613	31,470
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.00%	6.00%
Tier 1 Leverage Ratio, Amount	69,730	64,509
Tier 1 Leverage Ratio	9.30%	8.90%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	37,498	36,205
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
State Bank Of The Lakes [Member]	'	'
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]	'	'
Total Capital to Risk Weighted Assets, Amount	73,248	71,178
Total Capital to Risk Weighted Assets, Ratio	11.90%	11.50%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	61,698	61,886
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	10.00%	10.00%
Tier 1 Capital (to Risk Weighted Assets), Amount	68,399	61,521
Tier 1 Capital to Risk Weighted Assets, Ratio	11.10%	9.90%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	37,019	37,131
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.00%	6.00%
Tier 1 Leverage Ratio, Amount	68,399	61,521
Tier 1 Leverage Ratio	9.80%	8.40%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	34,784	36,570
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
Old Plank Trail Bank [Member]	'	'
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]	'	'
Total Capital to Risk Weighted Assets, Amount	96,495	74,445
Total Capital to Risk Weighted Assets, Ratio	12.70%	14.70%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	75,834	50,582
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	10.00%	10.00%
Tier 1 Capital (to Risk Weighted Assets), Amount	92,694	66,170
Tier 1 Capital to Risk Weighted Assets, Ratio	12.20%	13.10%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	45,500	30,349
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.00%	6.00%
Tier 1 Leverage Ratio, Amount	92,694	66,170
Tier 1 Leverage Ratio	8.70%	8.90%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	53,603	37,380
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
St. Charles Bank [Member]	'	'
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]	'	'
Total Capital to Risk Weighted Assets, Amount	71,170	66,079
Total Capital to Risk Weighted Assets, Ratio	11.40%	11.30%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	62,669	58,341
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	10.00%	10.00%
Tier 1 Capital (to Risk Weighted Assets), Amount	64,922	60,753
Tier 1 Capital to Risk Weighted Assets, Ratio	10.40%	10.40%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	37,601	35,004
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.00%	6.00%
Tier 1 Leverage Ratio, Amount	64,922	60,753
Tier 1 Leverage Ratio	9.60%	9.40%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	33,975	32,170
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%

Regulatory_Matters_Narrative_D

Regulatory Matters (Narrative) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]	'	'	'
Cash Dividends Paid to Parent Company by Consolidated Subsidiaries	$112.80	$45	$27.80
Amount available to be paid as dividends without prior regulatory approval	147.4	'	'
Reserve balances required to be maintained at the Federal Reserve Bank	$213.20	$160.20	'
Minimum ratio of qualifying total capital to risk-weighted assets	8.00%	'	'
Tier 1 minimum ratio of qualifying total capital to risk-weighted assets	4.00%	'	'
Tier 1 capital to total assets	10.50%	10.00%	'
Ratios required for the banks to be well capitalized, Total Capital to Risk-Weighted Assets	10.00%	'	'
Ratios required for the banks to be well capitalized, Tier1 Capital to Risk-Weighted Assets	6.00%	'	'
Ratios required for the banks to be well capitalized, Tier 1 Leverage Ratio	5.00%	'	'
Strong Bank Holding Companies [Member]	'	'	'
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]	'	'	'
Tier 1 capital to total assets	3.00%	'	'
Other Banking Holding Companies [Member]	'	'	'
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]	'	'	'
Tier 1 capital to total assets	4.00%	'	'

Commitments_And_Contingencies_

Commitments And Contingencies (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Commitments And Contingencies [Line Items]	'	'
Letters of credit outstanding, amount	$166,200,000	$174,300,000
Derivative, Notional Amount	225,000,000	'
Mortgage loans sold	3,700,000,000	3,900,000,000
Additional amount related to loss indemnification claims for residential mortgage loans previously sold to investors	3,800,000	4,300,000
Losses charged against indemnification liability	327,000	284,000
Customer balances maintained by clearing broker and subject to indemnification	29,900,000	'
Interest Rate Lock Commitments [Member]	'	'
Commitments And Contingencies [Line Items]	'	'
Derivative, Notional Amount	194,300,000	457,700,000
Forward Commitments to Sell Mortgage Loans [Member]	'	'
Commitments And Contingencies [Line Items]	'	'
Derivative, Notional Amount	472,100,000	858,100,000
Commercial, Commercial Real Estate And Construction Loans [Member]	'	'
Commitments And Contingencies [Line Items]	'	'
Loans and Leases Receivable, Commitments, Fixed Rates	2,700,000,000	2,600,000,000
Home Equity Loan [Member]	'	'
Commitments And Contingencies [Line Items]	'	'
Loans and Leases Receivable, Commitments, Fixed Rates	$747,100,000	$750,900,000

Derivative_Financial_Instrumen2

Derivative Financial Instruments Derivative Financial Instruments (Interest Rate Cap Derivative Summary) (Details) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Interest Rate Cap Derivative Summary [Line Items]	'
Derivative, Notional Amount	$225,000
Interest Rate Cap Twenty Million Notional September Two Thousand Fourteen Maturity [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]	'
Interest Rate Cap Derivative Summary [Line Items]	'
Derivative, Notional Amount	20,000
Interest Rate Derivatives, at Fair Value, Net	0
Interest Rate Cap Forty Million Notional September Two Thousand Fourteen Maturity [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]	'
Interest Rate Cap Derivative Summary [Line Items]	'
Derivative, Notional Amount	40,000
Interest Rate Derivatives, at Fair Value, Net	0
Interest Rate Cap Seventy Seven Million Notional May Two Thousand Fifteen Maturity [Member] | Derivatives Not Designed as Hedging Instruments Under ASC 815 [Member]	'
Interest Rate Cap Derivative Summary [Line Items]	'
Derivative, Notional Amount	77,000
Interest Rate Derivatives, at Fair Value, Net	3
Interest Rate Cap Two Hundred Fifteen Million Notional May Two Thousand Sixteen Maturity [Member] | Derivatives Not Designed as Hedging Instruments Under ASC 815 [Member]	'
Interest Rate Cap Derivative Summary [Line Items]	'
Derivative, Notional Amount	215,000
Interest Rate Derivatives, at Fair Value, Net	532
Interest Rate Cap Ninety Six Million Five Hundred Thirty Thousand Notional April Two Thousand Fifteen Maturity [Member] | Derivatives Not Designed as Hedging Instruments Under ASC 815 [Member]	'
Interest Rate Cap Derivative Summary [Line Items]	'
Derivative, Notional Amount	96,530
Interest Rate Derivatives, at Fair Value, Net	2
Interest Rate Cap Two Hundred Sixteen Million Five Hundred Thousand Notional August Two Thousand Sixteen Maturity [Member] | Derivatives Not Designed as Hedging Instruments Under ASC 815 [Member]	'
Interest Rate Cap Derivative Summary [Line Items]	'
Derivative, Notional Amount	216,500
Interest Rate Derivatives, at Fair Value, Net	979
Interest Rate Cap One Hundred Million Notional August Two Thousand Sixteen Maturity [Member] | Derivatives Not Designed as Hedging Instruments Under ASC 815 [Member]	'
Interest Rate Cap Derivative Summary [Line Items]	'
Derivative, Notional Amount	100,000
Interest Rate Derivatives, at Fair Value, Net	526
Interest Rate Cap One Hundred Million Notional March Two Thousand Seventeen Maturity [Member] | Derivatives Not Designed as Hedging Instruments Under ASC 815 [Member]	'
Interest Rate Cap Derivative Summary [Line Items]	'
Derivative, Notional Amount	100,000
Interest Rate Derivatives, at Fair Value, Net	1,158
Interest Rate Cap Seventy Five Million Notional November Two Thousand Sixteen Maturity [Member] | Derivatives Not Designed as Hedging Instruments Under ASC 815 [Member]	'
Interest Rate Cap Derivative Summary [Line Items]	'
Derivative, Notional Amount	75,000
Interest Rate Derivatives, at Fair Value, Net	558
Interest Rate Cap Fifty Million Notional September Two Thousand Seventeen Maturity [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]	'
Interest Rate Cap Derivative Summary [Line Items]	'
Derivative, Notional Amount	50,000
Interest Rate Derivatives, at Fair Value, Net	970
Interest Rate Cap Forty Million Notional September Two Thousand Seventeen Maturity [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]	'
Interest Rate Cap Derivative Summary [Line Items]	'
Derivative, Notional Amount	40,000
Interest Rate Derivatives, at Fair Value, Net	806
Total Interest Rate Cap [Member]	'
Interest Rate Cap Derivative Summary [Line Items]	'
Derivative, Notional Amount	1,030,030
Interest Rate Derivatives, at Fair Value, Net	5,534
Total Interest Rate Cap [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]	'
Interest Rate Cap Derivative Summary [Line Items]	'
Derivative, Notional Amount	150,000
Interest Rate Derivatives, at Fair Value, Net	$1,776

Derivative_Financial_Instrumen3

Derivative Financial Instruments (Schedule of Fair Value of Derivative Financial Instruments) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Derivative [Line Items]	'	'
Derivative Assets	$37,956	$47,546
Derivative Liabilities	34,807	53,755
Other Assets [Member]	'	'
Derivative [Line Items]	'	'
Derivative Assets	48,221	53,906
Other Assets [Member] | Designated as Hedging Instrument [Member]	'	'
Derivative [Line Items]	'	'
Derivative Assets	1,883	106
Other Assets [Member] | Derivatives Not Designed as Hedging Instruments Under ASC 815 [Member]	'	'
Derivative [Line Items]	'	'
Derivative Assets	46,338	53,800
Other Assets [Member] | Derivatives Not Designed as Hedging Instruments Under ASC 815 [Member] | Interest Rate Derivatives [Member]	'	'
Derivative [Line Items]	'	'
Derivative Assets	36,073	47,440
Other Assets [Member] | Derivatives Not Designed as Hedging Instruments Under ASC 815 [Member] | Interest Rate Lock Commitments [Member]	'	'
Derivative [Line Items]	'	'
Derivative Assets	7,500	6,069
Other Assets [Member] | Derivatives Not Designed as Hedging Instruments Under ASC 815 [Member] | Forward Commitments to Sell Mortgage Loans [Member]	'	'
Derivative [Line Items]	'	'
Derivative Assets	2,761	277
Other Assets [Member] | Derivatives Not Designed as Hedging Instruments Under ASC 815 [Member] | Foreign Exchange Contract [Member]	'	'
Derivative [Line Items]	'	'
Derivative Assets	4	14
Other Liabilities [Member]	'	'
Derivative [Line Items]	'	'
Derivative Liabilities	37,264	57,751
Other Liabilities [Member] | Designated as Hedging Instrument [Member]	'	'
Derivative [Line Items]	'	'
Derivative Liabilities	3,161	7,988
Other Liabilities [Member] | Derivatives Not Designed as Hedging Instruments Under ASC 815 [Member]	'	'
Derivative [Line Items]	'	'
Derivative Liabilities	34,103	49,763
Other Liabilities [Member] | Derivatives Not Designed as Hedging Instruments Under ASC 815 [Member] | Interest Rate Derivatives [Member]	'	'
Derivative [Line Items]	'	'
Derivative Liabilities	31,646	45,767
Other Liabilities [Member] | Derivatives Not Designed as Hedging Instruments Under ASC 815 [Member] | Interest Rate Lock Commitments [Member]	'	'
Derivative [Line Items]	'	'
Derivative Liabilities	147	937
Other Liabilities [Member] | Derivatives Not Designed as Hedging Instruments Under ASC 815 [Member] | Forward Commitments to Sell Mortgage Loans [Member]	'	'
Derivative [Line Items]	'	'
Derivative Liabilities	2,310	3,057
Other Liabilities [Member] | Derivatives Not Designed as Hedging Instruments Under ASC 815 [Member] | Foreign Exchange Contract [Member]	'	'
Derivative [Line Items]	'	'
Derivative Liabilities	0	2
Cash Flow Hedging [Member] | Other Assets [Member] | Designated as Hedging Instrument [Member] | Interest Rate Derivatives [Member]	'	'
Derivative [Line Items]	'	'
Derivative Assets	1,776	2
Cash Flow Hedging [Member] | Other Liabilities [Member] | Designated as Hedging Instrument [Member] | Interest Rate Derivatives [Member]	'	'
Derivative [Line Items]	'	'
Derivative Liabilities	3,160	7,988
Fair Value Hedging [Member] | Other Assets [Member] | Designated as Hedging Instrument [Member] | Interest Rate Derivatives [Member]	'	'
Derivative [Line Items]	'	'
Derivative Assets	107	104
Fair Value Hedging [Member] | Other Liabilities [Member] | Designated as Hedging Instrument [Member] | Interest Rate Derivatives [Member]	'	'
Derivative [Line Items]	'	'
Derivative Liabilities	$1	$0

Derivative_Financial_Instrumen4

Derivative Financial Instruments (Schedule of Cash Flow Hedging Derivatives) (Details) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Derivative [Line Items]	'
Derivative, Notional Amount	$225,000
Total Interest Rate Cap [Member]	'
Derivative [Line Items]	'
Fair Value Gain (Loss)	5,534
Derivative, Notional Amount	1,030,030
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swaps And Caps [Member]	'
Derivative [Line Items]	'
Fair Value Gain (Loss)	-1,384
Derivative, Notional Amount	225,000
Cash Flow Hedging [Member] | Interest Rate Swap Fifty Million Notional September Two Thousand Sixteen Maturity [Member] | Designated as Hedging Instrument [Member]	'
Derivative [Line Items]	'
Fair Value Gain (Loss)	-2,083
Derivative, Notional Amount	50,000
Cash Flow Hedging [Member] | Interest Rate Swap Twenty Five Million Notional October Two Thousand Sixteen Maturity [Member] | Designated as Hedging Instrument [Member]	'
Derivative [Line Items]	'
Fair Value Gain (Loss)	-1,077
Derivative, Notional Amount	25,000
Cash Flow Hedging [Member] | Total Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member]	'
Derivative [Line Items]	'
Fair Value Gain (Loss)	-3,160
Derivative, Notional Amount	75,000
Cash Flow Hedging [Member] | Interest Rate Cap Twenty Million Notional September Two Thousand Fourteen Maturity [Member] | Designated as Hedging Instrument [Member]	'
Derivative [Line Items]	'
Fair Value Gain (Loss)	0
Derivative, Notional Amount	20,000
Cash Flow Hedging [Member] | Interest Rate Cap Forty Million Notional September Two Thousand Fourteen Maturity [Member] | Designated as Hedging Instrument [Member]	'
Derivative [Line Items]	'
Fair Value Gain (Loss)	0
Derivative, Notional Amount	40,000
Cash Flow Hedging [Member] | Interest Rate Cap Fifty Million Notional September Two Thousand Seventeen Maturity [Member] | Designated as Hedging Instrument [Member]	'
Derivative [Line Items]	'
Fair Value Gain (Loss)	970
Derivative, Notional Amount	50,000
Cash Flow Hedging [Member] | Interest Rate Cap Forty Million Notional September Two Thousand Seventeen Maturity [Member] | Designated as Hedging Instrument [Member]	'
Derivative [Line Items]	'
Fair Value Gain (Loss)	806
Derivative, Notional Amount	40,000
Cash Flow Hedging [Member] | Total Interest Rate Cap [Member] | Designated as Hedging Instrument [Member]	'
Derivative [Line Items]	'
Fair Value Gain (Loss)	1,776
Derivative, Notional Amount	$150,000

Derivative_Financial_Instrumen5

Derivative Financial Instruments (Rollforward of Amounts in Accumulated Other Comprehensive Income Related to Interest Rate Swaps Designated as Cash Flow Hedges) (Details) (Interest Rate Contract [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Interest Rate Contract [Member]	'	'
Rollforward of AOCI from Cash Flow Hedging Derivatives [Roll Forward]	'	'
Unrealized loss at beginning of period	($8,673)	($11,633)
Amount reclassified from accumulated other comprehensive income to interest expense on junior subordinated debentures	5,115	5,850
Amount of loss recognized in other comprehensive income	-413	-2,890
Unrealized loss at end of period	($3,971)	($8,673)

Derivative_Financial_Instrumen6

Derivative Financial Instruments (Derivatives Used to Hedge Changes in Fair Value Attributable to Interest Rate Risk) (Details) (Fair Value Hedging [Member], Designated as Hedging Instrument [Member], Interest Rate Contract [Member], USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Amount of Gain or (Loss) Recognized in Income on Derivative	$67,000	($480,000)
Amount of Gain or (Loss) Recognized in Income on Hedged Item	-55,000	535,000
Income Statement Gain/(Loss) due to Hedge Ineffectiveness	$12,000	$55,000

Derivative_Financial_Instrumen7

Derivative Financial Instruments Derivative Financial Instruments (Summary Amounts Included in Consolidated Statement of Income Related to Derivatives) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Interest Rate Swaps And Caps [Member] | Other Income [Member]	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Income related to derivative instruments not designated in hedge relationships	$853	($1,974)
Mortgage Banking Derivatives [Member] | Mortgage Banking Revenue [Member]	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Income related to derivative instruments not designated in hedge relationships	6,026	1,659
Call Options Written [Member] | Fees From Covered Call Options [Member]	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Income related to derivative instruments not designated in hedge relationships	4,773	10,476
Foreign Exchange Contract [Member] | Other Income [Member]	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Income related to derivative instruments not designated in hedge relationships	($11)	$12

Derivative_Financial_Instrumen8

Derivative Financial Instruments Derivative Financial Instruments (Derivative Asset and Liability Balance Sheet Offsetting) (Details) (USD $)	Dec. 31, 2013		Dec. 31, 2012
Derivative Asset [Abstract]	'		'
Derivative, Collateral, Obligation to Return Securities	$0	[1]	$0	[1]
Derivative Asset, Fair Value, Gross Asset	37,956,000		47,546,000
Derivative Asset, Fair Value, Gross Liability	0		0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	37,956,000		47,546,000
Derivative Asset, Fair Value, Gross Liability Not Offset in the Statement of Financial Condition	-8,826,000		-339,000
Derivative, Collateral, Obligation to Return Cash	0		0
Derivative Asset, Fair Value, Amount Offset Against Collateral	29,130,000		47,207,000
Derivative Liability [Abstract]	'		'
Derivative Liability, Fair Value, Gross Liability	34,807,000		53,755,000
Derivative Liability, Fair Value, Gross Asset	0		0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	34,807,000		53,755,000
Derivative Liability, Fair Value, Gross Asset Not Offset in the Statement of Financial Condition	-8,826,000		-339,000
Derivative, Collateral, Right to Reclaim Securities	-25,981,000	[1]	-46,811,000	[1]
Derivative, Collateral, Right to Reclaim Cash	0		-6,605,000
Derivative Liability, Fair Value, Amount Offset Against Collateral	0		0
Security Owned and Pledged as Collateral, Fair Value	$34,600,000		$49,900,000
[1]	(1) As of December 31, 2013 and 2012, the Company posted securities collateral of $34.6 million and $49.9 million, respectively which resulted in excess collateral with its counterparties. For purposes of this disclosure, the amount of posted collateral is limited to the amount offsetting the derivative liability.

Derivative_Financial_Instrumen9

Derivative Financial Instruments (Narrative) (Details) (USD $)

12 Months Ended

3 Months Ended

12 Months Ended

12 Months Ended

Dec. 31, 2013

Jun. 30, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Interest Rate Swap [Member]

Forward Commitments to Sell Mortgage Loans [Member]

Forward Commitments to Sell Mortgage Loans [Member]

Interest Rate Lock Commitments [Member]

Interest Rate Lock Commitments [Member]

Foreign Exchange Contract [Member]

Call Options Written [Member]

Call Options Written [Member]

De-designated Hedge [Member]

Derivatives Not Designed as Hedging Instruments Under ASC 815 [Member]

Derivatives Not Designed as Hedging Instruments Under ASC 815 [Member]

Minimum [Member]

Maximum [Member]

Cash Flow Hedging [Member]

Cash Flow Hedging [Member]

Cash Flow Hedging [Member]

Fair Value Hedging [Member]

Fair Value Hedging [Member]

Fair Value Hedging [Member]

derivative_instruments

derivative_instruments

Interest Rate Caps [Member]

Interest Rate Caps [Member]

Interest Rate Contract [Member]

Designated as Hedging Instrument [Member]

Designated as Hedging Instrument [Member]

Designated as Hedging Instrument [Member]

Designated as Hedging Instrument [Member]

Designated as Hedging Instrument [Member]

Designated as Hedging Instrument [Member]

contracts

Interest Rate Swap [Member]

Interest Rate Caps [Member]

Interest Rate Swaps And Caps [Member]

Interest Rate Swap [Member]

Interest Rate Contract [Member]

Interest Rate Contract [Member]

derivative_instruments

derivative_instruments

derivative_instruments

Derivative Instruments, Gain (Loss) [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of interest rate derivatives held

'

'

'

'

'

'

'

0

0

'

7

'

'

'

2

4

'

3

'

'

Derivative, Notional Amount

$225,000,000

'

$472,100,000

$858,100,000

$194,300,000

$457,700,000

$1,000,000

'

'

$96,500,000

$880,000,000

$2,800,000,000

'

'

'

'

$225,000,000

$6,100,000

'

'

Amount reclassified from accumulated other comprehensive income to interest expense

1,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair value of derivatives, hedge ineffectiveness

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

12,000

55,000

Fair value hedges recognized net reduction to interest income

28,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Basis Amortization of Hedged item no longer in a Hedging Relationship

192,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative, Lower Remaining Maturity Range

'

30-Sep-13

'

'

'

'

'

'

'

'

'

'

28-Feb-14

31-Jan-33

'

'

'

'

'

'

Mortgage loans held-for-sale

334,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative, Net Liability Position, Aggregate Fair Value

$23,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair_Value_of_Assets_and_Liabi2

Fair Value of Assets and Liabilities (Summary of Balances of Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	$2,176,290	$1,796,076
Trading account securities	497	583
Derivative assets	37,956	47,546
Derivative liabilities	34,807	53,755
U.S. Treasury [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	336,095	219,487
U.S. Government Agencies [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	895,688	990,039
Municipal [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	152,716	110,471
Asset-backed Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	605,225	271,574
Equity Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	51,528	49,699
Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Trading account securities	497	583
Mortgage loans held-for-sale	332,485	385,033
Mortgage servicing rights	8,946	6,750
Nonqualified deferred compensation assets	7,222	5,532
Derivative assets	48,221	53,906
Total	2,573,661	2,247,880
Derivative liabilities	37,264	57,751
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Trading account securities	0	0
Mortgage loans held-for-sale	0	0
Mortgage servicing rights	0	0
Nonqualified deferred compensation assets	0	0
Derivative assets	0	0
Total	0	0
Derivative liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Trading account securities	497	583
Mortgage loans held-for-sale	332,485	385,033
Mortgage servicing rights	0	0
Nonqualified deferred compensation assets	7,222	5,532
Derivative assets	48,221	53,906
Total	2,506,166	2,188,191
Derivative liabilities	37,264	57,751
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Trading account securities	0	0
Mortgage loans held-for-sale	0	0
Mortgage servicing rights	8,946	6,750
Nonqualified deferred compensation assets	0	0
Derivative assets	0	0
Total	67,495	59,689
Derivative liabilities	0	0
Fair Value, Measurements, Recurring [Member] | U.S. Treasury [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	336,095	219,487
Fair Value, Measurements, Recurring [Member] | U.S. Treasury [Member] | Level 1 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring [Member] | U.S. Treasury [Member] | Level 2 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	336,095	219,487
Fair Value, Measurements, Recurring [Member] | U.S. Treasury [Member] | Level 3 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring [Member] | U.S. Government Agencies [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	895,688	990,039
Fair Value, Measurements, Recurring [Member] | U.S. Government Agencies [Member] | Level 1 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring [Member] | U.S. Government Agencies [Member] | Level 2 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	895,688	990,039
Fair Value, Measurements, Recurring [Member] | U.S. Government Agencies [Member] | Level 3 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Municipal [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	152,716	110,471
Fair Value, Measurements, Recurring [Member] | Municipal [Member] | Level 1 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Municipal [Member] | Level 2 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	116,330	79,701
Fair Value, Measurements, Recurring [Member] | Municipal [Member] | Level 3 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	36,386	30,770
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	135,038	154,806
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] | Level 1 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] | Level 2 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	135,038	154,806
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] | Level 3 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	605,225	271,574
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member] | Level 1 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member] | Level 2 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	605,225	271,574
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member] | Level 3 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	51,528	49,699
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Level 1 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Level 2 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	29,365	27,530
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Level 3 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	$22,163	$22,169

Fair_Value_of_Assets_and_Liabi3

Fair Value of Assets and Liabilities (Summary of Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Mortgage Servicing Rights [Member]	'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'
Beginning Balance	$6,750		$6,700
Total net gains (losses) included in Net income	2,196	[1]	50	[1]
Total net gains (losses) included in Other comprehensive income	0		0
Purchases	0		0
Issuances	0		0
Sales	0		0
Settlements	0		0
Net transfers into (out of) Level 3	0		0	[2]
Ending Balance	8,946		6,750
Municipal Bonds [Member]	'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'
Beginning Balance	30,770		24,211
Total net gains (losses) included in Net income	0	[1]	0	[1]
Total net gains (losses) included in Other comprehensive income	-296		27
Purchases	22,209		20,967
Issuances	0		0
Sales	0		0
Settlements	-16,297		-12,033
Net transfers into (out of) Level 3	0		-2,402	[2]
Ending Balance	36,386		30,770
Equity Securities [Member]	'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'
Beginning Balance	22,169		18,971
Total net gains (losses) included in Net income	-3,328	[1]	0	[1]
Total net gains (losses) included in Other comprehensive income	3,322		3,198
Purchases	0		0
Issuances	0		0
Sales	0		0
Settlements	0		0
Net transfers into (out of) Level 3	0		0	[2]
Ending Balance	$22,163		$22,169
[1]	Changes in the balance of mortgage servicing rights are recorded as a component of mortgage banking revenue in non-interest income.
[2]	(2)During the first quarter of 2012, one municipal security was transferred out of Level 3 into Level 2 as observable market information was available that market participants would use in pricing these securities. Transfers out of Level 3 are recognized at the end of the reporting period.

Fair_Value_of_Assets_and_Liabi4

Fair Value of Assets and Liabilities (Summary of Assets Measured at Fair Value on a Nonrecurring Basis) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'
Mortgage loans held-for-sale, at lower of cost or market	$334,300
Impaired loans, Fair Value Losses (Gains) Recognized	38,430
Other real estate owned, Fair Value Losses (Gains) Recognized	10,924
Mortgage loans held-for-sale, at lower of cost or market, Fair Value Losses (Gains) Recognized	0
Fair Value Losses (Gains) Recognized	49,354
Fair Value, Measurements, Nonrecurring [Member]	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'
Impaired loans	55,127
Other real estate owned	136,288
Mortgage loans held-for-sale, at lower of cost or market	1,842
Fair value of assets measured on nonrecurring basis	193,257
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member]	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'
Impaired loans	0
Other real estate owned	0
Mortgage loans held-for-sale, at lower of cost or market	0
Fair value of assets measured on nonrecurring basis	0
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member]	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'
Impaired loans	0
Other real estate owned	0
Mortgage loans held-for-sale, at lower of cost or market	1,842
Fair value of assets measured on nonrecurring basis	1,842
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member]	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'
Impaired loans	55,127
Other real estate owned	136,288
Mortgage loans held-for-sale, at lower of cost or market	0
Fair value of assets measured on nonrecurring basis	$191,415

Fair_Value_of_Assets_and_Liabi5

Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Schedule of Valuation Techniques and Significant Unobservable Inputs Used to Measure Both Recurring and Non-recurring) (Details) (USD $)

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

In Thousands, unless otherwise specified

Fair Value, Measurements, Nonrecurring [Member]

Fair Value, Measurements, Nonrecurring [Member]

Municipal Bonds [Member]

Municipal Bonds [Member]

Municipal Bonds [Member]

Municipal Bonds [Member]

Municipal Bonds [Member]

Equity Securities [Member]

Equity Securities [Member]

Equity Securities [Member]

Equity Securities [Member]

Equity Securities [Member]

Other Real Estate Owned [Member]

Other Real Estate Owned [Member]

Impaired Loans [Member]

Minimum [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

Mortgage Servicing Rights Prepayment Rate Input [Member]

Mortgage Servicing Rights Prepayment Rate Input [Member]

Mortgage Servicing Rights Discount Rate Input [Member]

Mortgage Servicing Rights Discount Rate Input [Member]

Mortgage Servicing Rights [Member]

Mortgage Servicing Rights [Member]

Mortgage Servicing Rights [Member]

Mortgage Servicing Rights [Member]

Mortgage Servicing Rights [Member]

Mortgage Servicing Rights [Member]

Level 3 [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Nonrecurring [Member]

Fair Value, Measurements, Nonrecurring [Member]

Fair Value, Measurements, Nonrecurring [Member]

Equity Securities [Member]

Other Real Estate Owned [Member]

Equity Securities [Member]

Other Real Estate Owned [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Minimum [Member]

Maximum [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Nonrecurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Nonrecurring [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair Value on a Recurring Basis

'

'

$36,386

$30,770

$24,211

'

'

$22,163

$22,169

$18,971

'

'

'

'

'

'

'

'

'

'

'

'

'

$8,946

$6,750

$6,700

'

'

'

Impaired loans

55,127

55,127

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Other real estate owned

$136,288

$136,288

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Valuation Methodology

'

'

'

'

'

'

'Bond pricing

'

'

'

'

'Discounted cash flows

'

'Appraisal value

'Appraisal value

'

'

'

'

'

'

'

'

'

'

'

'Discounted cash flows

'

'

Significant Unobservable Input

'

'

'

'

'

'

'Equivalent rating

'

'

'

'

'Discount rate

'

'Property specific impairment adjustment

'

'

'

'

'

'

'Constant prepayment rate (CPR)

'

'Discount rate

'

'

'

'

'

'

Range of Inputs

'

'

'

'

'

'BBB-AA+

'

'

'

'

'1.94%-3.06%

'

'0%-100%

'

'

'

'

'

'

'10%-15%

'

'10%-13.5%

'

'

'

'

'

'

'

Weighted Average of Inputs

'

'

'

'

'

'

'

'

'

'

2.54%

'

2.94%

'

'

'

'

'

'

11.94%

'

10.16%

'

'

'

'

'

'

'

Impact to Valuation from an Increased or HIgher Input Value

'

'

'

'

'

'

'Increase

'

'

'

'

'Decrease

'

'Decrease

'

'

'

'

'

'

'Decrease

'

'Decrease

'

'

'

'

'

'

Range of Inputs - Discount Rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1.94%

0.00%

3.06%

100.00%

'

'

'

'

'

'

'

'

10.00%

13.50%

Range of Inputs - Prepayment Rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

10.00%

15.00%

Fair_Value_of_Assets_and_Liabi6

Fair Value of Assets and Liabilities (Summary of Carrying Amounts and Estimated Fair Values of Financial Instruments) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Cash and cash equivalents	$263,864,000	$315,028,000	$169,704,000	$172,580,000
Interest bearing deposits with banks	495,574,000	1,035,743,000	'	'
Available-for-sale securities, at fair value	2,176,290,000	1,796,076,000	'	'
Trading account securities	497,000	583,000	'	'
Brokerage customer receivables	30,953,000	24,864,000	'	'
Federal Home Loan Bank and Federal Reserve Bank stock, at cost	79,261,000	79,564,000	'	'
Mortgage loans held-for-sale, at fair value	332,485,000	385,033,000	'	'
Mortgage loans held-for-sale, at lower of cost or market	1,842,000	27,167,000	'	'
Total loans	13,243,033,000	12,389,030,000	'	'
Mortgage servicing rights	8,946,000	6,750,000	6,700,000	8,762,000
FDIC indemnification asset	85,672,000	208,160,000	344,251,000	'
Notes payable	364,000	2,093,000	'	'
Federal Home Loan Bank advances	417,762,000	414,122,000	'	'
Subordinated notes	0	15,000,000	'	'
Other borrowings	254,740,000	274,411,000	'	'
Junior subordinated debentures	249,493,000	249,493,000	'	'
Carrying Value [Member]	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Cash and cash equivalents	263,864,000	315,028,000	'	'
Interest bearing deposits with banks	495,574,000	1,035,743,000	'	'
Available-for-sale securities, at fair value	2,176,290,000	1,796,076,000	'	'
Trading account securities	497,000	583,000	'	'
Brokerage customer receivables	30,953,000	24,864,000	'	'
Federal Home Loan Bank and Federal Reserve Bank stock, at cost	79,261,000	79,564,000	'	'
Mortgage loans held-for-sale, at fair value	332,485,000	385,033,000	'	'
Mortgage loans held-for-sale, at lower of cost or market	1,842,000	27,167,000	'	'
Total loans	13,243,033,000	12,389,030,000	'	'
Mortgage servicing rights	8,946,000	6,750,000	'	'
Nonqualified deferred compensation assets	7,222,000	5,532,000	'	'
Derivative assets	48,221,000	53,906,000	'	'
FDIC indemnification asset	85,672,000	208,160,000	'	'
Accrued interest receivable and other	163,732,000	157,157,000	'	'
Total financial assets	16,937,592,000	16,484,593,000	'	'
Non-maturity deposits	10,442,077,000	9,447,633,000	'	'
Deposits with stated maturities	4,226,712,000	4,980,911,000	'	'
Notes payable	364,000	2,093,000	'	'
Federal Home Loan Bank advances	417,762,000	414,122,000	'	'
Subordinated notes	0	15,000,000	'	'
Other borrowings	254,740,000	274,411,000	'	'
Junior subordinated debentures	249,493,000	249,493,000	'	'
Derivative liabilities	37,264,000	57,751,000	'	'
Accrued interest payable and other	8,556,000	11,589,000	'	'
Total financial liabilities	15,636,968,000	15,453,003,000	'	'
Fair Value [Member]	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Cash and cash equivalents	263,864,000	315,028,000	'	'
Interest bearing deposits with banks	495,574,000	1,035,743,000	'	'
Available-for-sale securities, at fair value	2,176,290,000	1,796,076,000	'	'
Trading account securities	497,000	583,000	'	'
Brokerage customer receivables	30,953,000	24,864,000	'	'
Federal Home Loan Bank and Federal Reserve Bank stock, at cost	79,261,000	79,564,000	'	'
Mortgage loans held-for-sale, at fair value	332,485,000	385,033,000	'	'
Mortgage loans held-for-sale, at lower of cost or market	1,857,000	27,568,000	'	'
Total loans	13,867,255,000	13,053,101,000	'	'
Mortgage servicing rights	8,946,000	6,750,000	'	'
Nonqualified deferred compensation assets	7,222,000	5,532,000	'	'
Derivative assets	48,221,000	53,906,000	'	'
FDIC indemnification asset	85,672,000	208,160,000	'	'
Accrued interest receivable and other	163,732,000	157,157,000	'	'
Total financial assets	17,561,829,000	17,149,065,000	'	'
Non-maturity deposits	10,442,077,000	9,447,633,000	'	'
Deposits with stated maturities	4,242,172,000	5,013,757,000	'	'
Notes payable	364,000	2,093,000	'	'
Federal Home Loan Bank advances	422,750,000	425,431,000	'	'
Subordinated notes	0	15,000,000	'	'
Other borrowings	254,740,000	274,411,000	'	'
Junior subordinated debentures	250,672,000	250,428,000	'	'
Derivative liabilities	37,264,000	57,751,000	'	'
Accrued interest payable and other	8,556,000	11,589,000	'	'
Total financial liabilities	$15,658,595,000	$15,498,093,000	'	'

Fair_Value_of_Assets_and_Liabi7

Fair Value of Assets and Liabilities Fair Values of Assets and Liabilities (Narrative) (Details) (USD $)

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Estimate of Fair Value Measurement [Member]

Estimate of Fair Value Measurement [Member]

Valued Using Discounted Cash Flow Model [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Nonrecurring [Member]

Fair Value, Measurements, Nonrecurring [Member]

Municipal Bonds [Member]

Municipal Bonds [Member]

Municipal Bonds [Member]

Equity Securities [Member]

Equity Securities [Member]

Equity Securities [Member]

Equity Securities [Member]

Minimum [Member]

Maximum [Member]

Weighted Average [Member]

Mortgage Servicing Rights [Member]

Mortgage Servicing Rights [Member]

Mortgage Servicing Rights [Member]

Mortgage Servicing Rights [Member]

Mortgage Servicing Rights [Member]

Mortgage Servicing Rights [Member]

Other Real Estate Owned [Member]

Other Real Estate Owned [Member]

Other Real Estate Owned [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Fair Value, Measurements, Recurring [Member]

Equity Securities [Member]

Equity Securities [Member]

Equity Securities [Member]

Minimum [Member]

Maximum [Member]

Weighted Average [Member]

Fair Value, Measurements, Nonrecurring [Member]

Minimum [Member]

Maximum [Member]

Level 3 [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Level 3 [Member]

Fair Value, Measurements, Nonrecurring [Member]

Fair Value, Measurements, Nonrecurring [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair value

'

'

'

'

'

'

'

'

'

'

'

$36,386,000

$30,770,000

$24,211,000

$22,163,000

$22,169,000

$18,971,000

'

'

'

'

$8,946,000

$6,750,000

$6,700,000

'

'

'

'

'

'

Discount rate input

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1.94%

3.06%

2.54%

'

'

'

10.00%

13.50%

10.16%

'

0.00%

100.00%

Fair value inputs, prepayment rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

10.00%

15.00%

11.94%

'

'

'

Principal Amount Outstanding on Loans Held-for-sale or Securitization or Asset-backed Financing Arrangement

'

'

314,900,000

379,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Mortgage loans held-for-sale

'

'

'

'

'

332,485,000

385,033,000

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Mortgages held-for-sale, past due 90 days and accruing

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total impaired loans

162,229,000

204,545,000

[1]

'

'

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Impaired loans

'

'

'

'

'

'

'

'

'

55,127,000

55,127,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Other real estate owned

'

'

'

'

'

'

'

'

'

$136,288,000

$136,288,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Weighted average of inputs

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2.54%

'

'

'

'

'

'

'

'

'

2.94%

'

'

[1]

Impaired loans are considered by the Company to be non-accrual loans, TDRs or loans with principal and/or interest at risk, even if the loan is current with all payments of principal and interest.

Shareholders_Equity_Summary_of

Shareholders' Equity (Summary of the Company's Common and Preferred Stock) (Details) (USD $)

1 Months Ended

3 Months Ended

12 Months Ended

Jan. 31, 2014

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Stockholders' Equity Note [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Common stock, shares authorized

'

100,000,000

'

'

'

100,000,000

'

'

'

100,000,000

100,000,000

'

Common stock, shares issued

'

46,181,588

'

'

'

37,107,684

'

'

'

46,181,588

37,107,684

'

Common stock, shares outstanding

'

46,116,583,000

'

'

'

36,858,355,000

'

'

'

46,116,583,000

36,858,355,000

'

Cash dividend per share (in usd per share)

$0.10

$0

$0.09

$0

$0.09

$0

$0.09

$0

$0.09

$0.18

$0.18

$0.18

Preferred stock, shares authorized

'

20,000,000

'

'

'

20,000,000

'

'

'

20,000,000

20,000,000

'

Preferred stock, shares issued

'

126,477

'

'

'

176,500

'

'

'

126,477

176,500

'

Preferred stock, shares outstanding

'

126,477

'

'

'

176,500

'

'

'

126,477

176,500

'

Shareholders_Equity_Aggregate_

Shareholders' Equity (Aggregate Fair Values Assigned to Each Component of Tangible Equity Units Offering) (Details) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2010	Dec. 07, 2010
Class of Stock [Line Items]	'	'
Tangible Equity Unit Components	'	2
Units issued	'	4,600	[1]
Unit price (usd per share)	'	$50
Gross proceeds	'	$230,000
Issuance costs, including discount	'	7,353
Net proceeds	222,647	'
Borrowings [Member]	'	'
Class of Stock [Line Items]	'	'
Net proceeds	43,331	'
Surplus	'	'
Class of Stock [Line Items]	'	'
Net proceeds	179,316	'
Debt [Member]	'	'
Class of Stock [Line Items]	'	'
Units issued	'	4,600	[1]
Unit price (usd per share)	'	$9.73
Gross proceeds	'	44,750
Issuance costs, including discount	'	1,419
Net proceeds	43,331	'
Debt [Member] | Borrowings [Member]	'	'
Class of Stock [Line Items]	'	'
Net proceeds	43,331	'
Debt [Member] | Surplus	'	'
Class of Stock [Line Items]	'	'
Net proceeds	0	'
Equity [Member]	'	'
Class of Stock [Line Items]	'	'
Tangible Equity Unit Components	'	1
Units issued	'	4,600	[1]
Unit price (usd per share)	'	$40.27
Gross proceeds	'	185,250
Issuance costs, including discount	'	5,934
Net proceeds	179,316	'
Equity [Member] | Borrowings [Member]	'	'
Class of Stock [Line Items]	'	'
Net proceeds	0	'
Equity [Member] | Surplus	'	'
Class of Stock [Line Items]	'	'
Net proceeds	$179,316	'
Borrowings [Member]	'	'
Class of Stock [Line Items]	'	'
Tangible Equity Unit Components	'	1
[1]	TEUs consisted of two components: one unit of the equity component and one unit of the debt component.

Shareholders_Equity_Shareholde

Shareholders' Equity Shareholders' Equity (Components of Accumulated Other Comprehensive Income) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Activity Accumulated Other Comprehensive Income [Roll Forward]	'	'	'
Balance at beginning of period	$7,711,000	($2,878,000)	($5,512,000)
Other comprehensive income (loss) during the period, net of tax, before reclassification	-75,635,000	10,041,000	-1,213,000
Amount reclassified from accumulated other comprehensive income (loss), net of tax	4,888,000	548,000	3,847,000
Total other comprehensive (loss) income	-70,747,000	10,589,000	2,634,000
Balance at end of period	-63,036,000	7,711,000	-2,878,000
Accumulated Net Unrealized Investment Gain (Loss) [Member]	'	'	'
Activity Accumulated Other Comprehensive Income [Roll Forward]	'	'	'
Balance at beginning of period	6,710,000	4,204,000	2,679,000
Other comprehensive income (loss) during the period, net of tax, before reclassification	-62,182,000	5,461,000	2,605,000
Amount reclassified from accumulated other comprehensive income (loss), net of tax	1,807,000	-2,955,000	-1,080,000
Total other comprehensive (loss) income	-60,375,000	2,506,000	1,525,000
Balance at end of period	-53,665,000	6,710,000	4,204,000
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]	'	'	'
Activity Accumulated Other Comprehensive Income [Roll Forward]	'	'	'
Balance at beginning of period	-5,292,000	-7,082,000	-8,191,000
Other comprehensive income (loss) during the period, net of tax, before reclassification	-251,000	-1,713,000	-3,818,000
Amount reclassified from accumulated other comprehensive income (loss), net of tax	3,081,000	3,503,000	4,927,000
Total other comprehensive (loss) income	2,830,000	1,790,000	1,109,000
Balance at end of period	-2,462,000	-5,292,000	-7,082,000
Accumulated Translation Adjustment [Member]	'	'	'
Activity Accumulated Other Comprehensive Income [Roll Forward]	'	'	'
Balance at beginning of period	6,293,000	0	0
Other comprehensive income (loss) during the period, net of tax, before reclassification	-13,202,000	6,293,000	0
Amount reclassified from accumulated other comprehensive income (loss), net of tax	0	0	0
Total other comprehensive (loss) income	-13,202,000	6,293,000	0
Balance at end of period	($6,909,000)	$6,293,000	$0

Shareholders_Equity_Shareholde1

Shareholders' Equity Shareholders' Equity (Reclassification from Accumulated Other Comprehensive Income) (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'	'	'	'	'	'	'	'	'
(Losses) gains on available-for-sale securities, net	($3,328,000)	$75,000	$2,000	$251,000	$2,561,000	$409,000	$1,109,000	$816,000	($3,000,000)	$4,895,000	$1,792,000
Income before taxes	57,822,000	58,082,000	56,250,000	52,286,000	48,871,000	52,173,000	41,329,000	37,759,000	224,440,000	180,132,000	128,033,000
Income tax expense	22,534,000	22,519,000	21,943,000	20,234,000	18,782,000	19,871,000	15,734,000	14,549,000	87,230,000	68,936,000	50,458,000
Net income	35,288,000	35,563,000	34,307,000	32,052,000	30,089,000	32,302,000	25,595,000	23,210,000	137,210,000	111,196,000	77,575,000
Interest on junior subordinated debentures	'	'	'	'	'	'	'	'	11,369,000	12,616,000	16,272,000
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]	'	'	'	'	'	'	'	'	'	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'	'	'	'	'	'	'	'	'
(Losses) gains on available-for-sale securities, net	'	'	'	'	'	'	'	'	-3,000,000	4,895,000	'
Income before taxes	'	'	'	'	'	'	'	'	-3,000,000	4,895,000	'
Income tax expense	'	'	'	'	'	'	'	'	-1,193,000	1,940,000	'
Net income	'	'	'	'	'	'	'	'	-1,807,000	2,955,000	'
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]	'	'	'	'	'	'	'	'	'	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Income before taxes	'	'	'	'	'	'	'	'	-5,116,000	-5,850,000	'
Income tax expense	'	'	'	'	'	'	'	'	-2,035,000	-2,347,000	'
Net income	'	'	'	'	'	'	'	'	-3,081,000	-3,503,000	'
Interest on junior subordinated debentures	'	'	'	'	'	'	'	'	$5,116,000	$5,850,000	'

Shareholders_Equity_Narrative_

Shareholders' Equity (Narrative) (Details) (USD $)

0 Months Ended

1 Months Ended

3 Months Ended

12 Months Ended

1 Months Ended

1 Months Ended

12 Months Ended

12 Months Ended

0 Months Ended

1 Months Ended

0 Months Ended

1 Months Ended

0 Months Ended

12 Months Ended

Feb. 20, 2014

Feb. 06, 2014

Dec. 15, 2013

Dec. 19, 2008

Jan. 31, 2014

Feb. 28, 2013

Mar. 31, 2012

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2010

Dec. 07, 2010

Jul. 19, 2013

Aug. 31, 2008

Dec. 31, 2013

Dec. 31, 2012

Mar. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2010

Sep. 29, 2011

Aug. 31, 2012

Jul. 31, 2011

1-May-13

Dec. 31, 2012

Mar. 15, 2011

Dec. 31, 2013

Dec. 31, 2010

Dec. 15, 2013

Dec. 07, 2010

Series A Preferred Stock [Member]

Series A Preferred Stock [Member]

Series A Preferred Stock [Member]

Series A Preferred Stock [Member]

Series C Preferred Stock [Member]

Series C Preferred Stock [Member]

Series C Preferred Stock [Member]

Equity [Member]

Elgin State Bancorp Inc [Member]

Great Lakes Advisors [Member]

Great Lakes Advisors [Member]

First Lansing Bancorp, Inc. [Member]

HPK Financial Corporation [Member]

Junior Subordinated Debt [Member]

Junior Subordinated Debt [Member]

Junior Subordinated Debt [Member]

Junior Subordinated Debt [Member]

Junior Subordinated Debt [Member]

Shareholders' Equity [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Tangible equity units sold (in shares)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of tangible equity units sold

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

7.50%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Tangible equity unit public offering price per unit (in usd per share)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$50

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Tangible equity unit, net proceeds

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$222,700,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Maturity Date

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

15-Dec-13

15-Dec-13

'

'

Debt Instrument, Frequency of Periodic Payment

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'quarterly

'quarterly

'

'

Percentage of fair value of debt component quarterly cash payments

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

7.50%

'

'

Discount rate on debt component

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

9.50%

Risk-free rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1.00%

0.70%

1.00%

'

'

'

'

'

'

'

'

'

0.95%

'

'

'

'

'

'

'

'

'

'

Expected stock price volatility minimum

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

35.00%

'

'

'

'

'

'

'

'

'

'

Expected stock price volatility maximum

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

45.00%

'

'

'

'

'

'

'

'

'

'

Percent of dividend yield plus stock borrow cost

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.85%

'

'

'

'

'

'

'

'

'

'

Equity term

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'4 years 6 months

'4 years 6 months

'4 years 4 months 24 days

'

'

'

'

'

'

'

'

'

'3 years 0 months 7 days

'

'

'

'

'

'

'

'

'

'

Junior subordinated amortizing note, initial principal amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

9.728182

Debt Instrument, Interest Rate, Stated Percentage

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

9.50%

9.50%

Quarterly installments on amortizing note

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.989583

'

0.9375

'

'

Settlement rate

'

'

1.3333

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of consecutive trading days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'20 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Amount Per Share Reclassified From Surplus To Common Stock

'

'

$1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Preferred Stock, Shares Issued

'

'

'

'

'

'

'

126,477

'

'

'

176,500

'

'

'

126,477

176,500

'

'

'

50,000

50,000

0

50,000

126,500

126,477

126,500

'

'

'

'

'

'

'

'

'

'

'

Preferred stock, liquidation value (in usd per share)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$1,000

$1,000

$1,000

$1,000

$1,000

$1,000

'

'

'

'

'

'

'

'

'

'

'

Preferred Stock, Value, Issued

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$50,000,000

$0

$49,906,000

$126,500,000

$126,477,000

$126,500,000

'

'

'

'

'

'

'

'

'

'

'

Preferred stock, dividend rate, percentage

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

8.00%

'

'

5.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

Preferred stock convertible into common stock, option of holder at a conversion rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

38.88

'

'

24.3132

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock Issued During Period, Shares, Conversion of Convertible Securities

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,944,000

'

'

'

'

559

'

'

'

'

'

'

'

'

'

'

'

'

Conversion of Stock, Shares Converted

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

23

'

'

'

'

'

'

'

'

'

'

'

'

Common Stock, No Par Value

'

'

'

'

'

'

'

$0

'

'

'

$0

'

'

'

$0

$0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Warrant for purchase of shares (in shares)

'

'

'

1,643,295

'

'

'

1,643,295

'

'

'

'

'

'

'

1,643,295

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Exercise price of common stock (in usd per share)

'

'

'

$22.82

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Warrant termination period

'

'

'

'10 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Warrants holders common stock purchase price (in usd per share)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$30.50

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Warrants outstanding (in shares)

'

'

'

'

'

'

19,000

0

'

'

'

1,000

'

'

19,000

0

1,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Warrants exercised (in shares)

'

'

'

'

'

1,000

18,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Shares issued in acquisitions

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

353,650

25,493

529,087

648,286

372,530

'

'

'

'

'

Cash dividends declared per common share (in usd per share)

'

'

'

'

$0.10

'

'

$0

$0.09

$0

$0.09

$0

$0.09

$0

$0.09

$0.18

$0.18

$0.18

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common Stock Dividends Per Share Declared Annualized (in usd per share)

'

'

'

'

$0.40

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Dividends Payable, Date to be Paid

20-Feb-14

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Dividends Payable, Date of Record

'

6-Feb-14

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Segment_Information_Summary_Of

Segment Information (Summary Of Certain Operating Information For Reportable Segments) (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net interest income	$142,308,000	$141,782,000	$135,824,000	$130,713,000	$132,776,000	$132,575,000	$128,270,000	$125,895,000	$550,627,000	$519,516,000	$461,377,000
Provision for credit losses	3,850,000	11,114,000	15,382,000	15,687,000	19,546,000	18,799,000	20,691,000	17,400,000	46,033,000	76,436,000	102,638,000
Noninterest income	'	'	'	'	'	'	'	'	222,397,000	226,092,000	189,698,000
Noninterest expense	126,997,000	127,248,000	128,187,000	120,119,000	129,548,000	124,548,000	117,185,000	117,759,000	502,551,000	489,040,000	420,404,000
Income tax expense	22,534,000	22,519,000	21,943,000	20,234,000	18,782,000	19,871,000	15,734,000	14,549,000	87,230,000	68,936,000	50,458,000
Net income	35,288,000	35,563,000	34,307,000	32,052,000	30,089,000	32,302,000	25,595,000	23,210,000	137,210,000	111,196,000	77,575,000
Total assets at end of year	18,097,783,000	'	'	'	17,519,613,000	'	'	'	18,097,783,000	17,519,613,000	15,893,808,000
Operating Segments [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net interest income	'	'	'	'	'	'	'	'	536,194,000	506,777,000	454,854,000
Provision for credit losses	'	'	'	'	'	'	'	'	46,033,000	76,436,000	102,638,000
Noninterest income	'	'	'	'	'	'	'	'	247,030,000	247,660,000	202,136,000
Noninterest expense	'	'	'	'	'	'	'	'	512,751,000	497,869,000	426,319,000
Income tax expense	'	'	'	'	'	'	'	'	87,230,000	68,936,000	50,458,000
Net income	'	'	'	'	'	'	'	'	137,210,000	111,196,000	77,575,000
Total assets at end of year	18,097,783,000	'	'	'	17,519,613,000	'	'	'	18,097,783,000	17,519,613,000	15,893,808,000
Operating Segments [Member] | Community Banking [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net interest income	'	'	'	'	'	'	'	'	448,173,000	430,405,000	370,733,000
Provision for credit losses	'	'	'	'	'	'	'	'	45,396,000	74,975,000	102,902,000
Noninterest income	'	'	'	'	'	'	'	'	150,543,000	166,296,000	139,248,000
Noninterest expense	'	'	'	'	'	'	'	'	409,780,000	403,228,000	342,283,000
Income tax expense	'	'	'	'	'	'	'	'	55,161,000	45,170,000	24,681,000
Net income	'	'	'	'	'	'	'	'	88,379,000	73,328,000	40,115,000
Total assets at end of year	15,132,912,000	'	'	'	14,787,221,000	'	'	'	15,132,912,000	14,787,221,000	13,286,432,000
Operating Segments [Member] | Specialty Finance [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net interest income	'	'	'	'	'	'	'	'	73,903,000	64,048,000	72,893,000
Provision for credit losses	'	'	'	'	'	'	'	'	637,000	1,461,000	-264,000
Noninterest income	'	'	'	'	'	'	'	'	30,890,000	26,845,000	15,133,000
Noninterest expense	'	'	'	'	'	'	'	'	40,529,000	38,394,000	32,829,000
Income tax expense	'	'	'	'	'	'	'	'	25,508,000	19,660,000	22,511,000
Net income	'	'	'	'	'	'	'	'	38,119,000	31,378,000	32,950,000
Total assets at end of year	2,470,832,000	'	'	'	2,295,284,000	'	'	'	2,470,832,000	2,295,284,000	2,185,214,000
Operating Segments [Member] | Wealth Management [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net interest income	'	'	'	'	'	'	'	'	14,118,000	12,324,000	11,228,000
Provision for credit losses	'	'	'	'	'	'	'	'	0	0	0
Noninterest income	'	'	'	'	'	'	'	'	65,597,000	54,519,000	47,755,000
Noninterest expense	'	'	'	'	'	'	'	'	62,442,000	56,247,000	51,207,000
Income tax expense	'	'	'	'	'	'	'	'	6,561,000	4,106,000	3,266,000
Net income	'	'	'	'	'	'	'	'	10,712,000	6,490,000	4,510,000
Total assets at end of year	494,039,000	'	'	'	437,108,000	'	'	'	494,039,000	437,108,000	422,162,000
Intersegment Eliminations [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net interest income	'	'	'	'	'	'	'	'	14,433,000	12,739,000	6,523,000
Provision for credit losses	'	'	'	'	'	'	'	'	0	0	0
Noninterest income	'	'	'	'	'	'	'	'	-24,633,000	-21,568,000	-12,438,000
Noninterest expense	'	'	'	'	'	'	'	'	-10,200,000	-8,829,000	-5,915,000
Income tax expense	'	'	'	'	'	'	'	'	0	0	0
Net income	'	'	'	'	'	'	'	'	0	0	0
Total assets at end of year	$0	'	'	'	$0	'	'	'	$0	$0	$0

Segment_Information_Segment_Re

Segment Information Segment Reporting Narrative (Details)	12 Months Ended	24 Months Ended
	Dec. 31, 2013	Dec. 31, 2013
	segment	segment
	subsidiary
Segment Reporting Information [Line Items]	'	'
Number of bank subsidiaries that management monitors	15	'
Number of Reportable Segments	3	3
Community Banking [Member]	'	'
Segment Reporting Information [Line Items]	'	'
Number of Reportable Segments	1	'

Condensed_Parent_Company_Finan2

Condensed Parent Company Financial Statements (Balance Sheets) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Assets	'	'	'	'
Cash	$253,408,000	$284,731,000	'	'
Available-for-sale securities, at fair value	2,176,290,000	1,796,076,000	'	'
Loans, net of unearned income	12,896,602,000	11,828,943,000	'	'
Less: Allowance for loan losses	-96,922,000	-107,351,000	-110,381,000	'
Goodwill	374,547,000	345,401,000	'	'
Total assets	18,097,783,000	17,519,613,000	15,893,808,000	'
Liabilities and Shareholders' Equity	'	'	'	'
Notes payable	364,000	2,093,000	'	'
Subordinated notes	0	15,000,000	'	'
Other borrowings	254,740,000	274,411,000	'	'
Junior subordinated debentures	249,493,000	249,493,000	'	'
Shareholders' equity	1,900,589,000	1,804,705,000	1,543,533,000	1,436,549,000
Total liabilities and shareholders' equity	18,097,783,000	17,519,613,000	'	'
Parent Company [Member]	'	'	'	'
Assets	'	'	'	'
Cash	80,869,000	55,011,000	'	'
Available-for-sale securities, at fair value	12,839,000	9,647,000	'	'
Investment in and receivable from subsidiaries	1,971,018,000	1,935,556,000	'	'
Loans, net of unearned income	3,768,000	1,760,000	'	'
Less: Allowance for loan losses	-81,000	0	'	'
Net Loans	3,687,000	1,760,000	'	'
Goodwill	8,371,000	8,347,000	'	'
Other assets	113,930,000	111,786,000	'	'
Total assets	2,190,714,000	2,122,107,000	'	'
Liabilities and Shareholders' Equity	'	'	'	'
Other liabilities	21,292,000	15,899,000	'	'
Notes payable	0	1,000,000	'	'
Subordinated notes	0	15,000,000	'	'
Other borrowings	19,340,000	36,010,000	'	'
Junior subordinated debentures	249,493,000	249,493,000	'	'
Shareholders' equity	1,900,589,000	1,804,705,000	'	'
Total liabilities and shareholders' equity	$2,190,714,000	$2,122,107,000	'	'

Condensed_Parent_Company_Finan3

Condensed Parent Company Financial Statements (Statements Of Income) (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income	'	'	'	'	'	'	'	'	'	'	'
(Losses) gains on available-for-sale securities, net	($3,328,000)	$75,000	$2,000	$251,000	$2,561,000	$409,000	$1,109,000	$816,000	($3,000,000)	$4,895,000	$1,792,000
Other income	'	'	'	'	'	'	'	'	29,467,000	25,497,000	19,603,000
Expenses	'	'	'	'	'	'	'	'	'	'	'
Interest expense	18,274,000	19,386,000	20,822,000	21,600,000	23,867,000	25,626,000	27,421,000	30,591,000	80,082,000	107,505,000	144,416,000
Salaries and employee benefits	'	'	'	'	'	'	'	'	308,794,000	288,589,000	237,785,000
Income before taxes	57,822,000	58,082,000	56,250,000	52,286,000	48,871,000	52,173,000	41,329,000	37,759,000	224,440,000	180,132,000	128,033,000
Income tax benefit	-22,534,000	-22,519,000	-21,943,000	-20,234,000	-18,782,000	-19,871,000	-15,734,000	-14,549,000	-87,230,000	-68,936,000	-50,458,000
Net income	35,288,000	35,563,000	34,307,000	32,052,000	30,089,000	32,302,000	25,595,000	23,210,000	137,210,000	111,196,000	77,575,000
Parent Company [Member]	'	'	'	'	'	'	'	'	'	'	'
Income	'	'	'	'	'	'	'	'	'	'	'
Dividends and interest from subsidiaries	'	'	'	'	'	'	'	'	114,241,000	47,295,000	30,783,000
(Losses) gains on available-for-sale securities, net	'	'	'	'	'	'	'	'	111,000	64,000	164,000
Other income	'	'	'	'	'	'	'	'	4,529,000	605,000	-487,000
Total income	'	'	'	'	'	'	'	'	118,881,000	47,964,000	30,460,000
Expenses	'	'	'	'	'	'	'	'	'	'	'
Interest expense	'	'	'	'	'	'	'	'	13,424,000	16,840,000	21,342,000
Salaries and employee benefits	'	'	'	'	'	'	'	'	17,831,000	20,042,000	12,435,000
Other expenses	'	'	'	'	'	'	'	'	24,739,000	27,428,000	14,037,000
Total expenses	'	'	'	'	'	'	'	'	55,994,000	64,310,000	47,814,000
Income before taxes	'	'	'	'	'	'	'	'	62,887,000	-16,346,000	-17,354,000
Income tax benefit	'	'	'	'	'	'	'	'	18,599,000	23,127,000	16,573,000
Income (loss) before equity in undistributed net loss of subsidiaries	'	'	'	'	'	'	'	'	81,486,000	6,781,000	-781,000
Equity in undistributed net income of subsidiaries	'	'	'	'	'	'	'	'	55,724,000	104,415,000	78,356,000
Net income	'	'	'	'	'	'	'	'	$137,210,000	$111,196,000	$77,575,000

Condensed_Parent_Company_Finan4

Condensed Parent Company Financial Statements (Statements Of Cash Flows) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Activities:	'	'	'
Net income	$137,210,000	$111,196,000	$77,575,000
Adjustments to reconcile net income to net cash provided by (used for) operating activities	'	'	'
Provision for credit losses	46,033,000	76,436,000	102,638,000
Losses (gains) on available-for-sale securities, net	3,000,000	-4,895,000	-1,792,000
Depreciation and amortization	26,180,000	24,676,000	19,469,000
Deferred income tax expense (benefit)	1,539,000	-23,315,000	-639,000
Stock-based compensation expense	6,799,000	9,072,000	5,692,000
Tax (expense) benefit from stock-based compensation arrangements	-831,000	1,392,000	129,000
Excess tax benefits from stock-based compensation arrangements	-474,000	-841,000	-306,000
Increase in other assets	54,300,000	15,605,000	12,582,000
(Decrease) increase in other liabilities	-21,749,000	137,743,000	-9,720,000
Net Cash Provided by (Used for) Operating Activities	321,785,000	268,654,000	244,267,000
Investing Activities:	'	'	'
Net Cash Used for Investing Activities	-240,797,000	-495,875,000	-836,964,000
Financing Activities:	'	'	'
(Decrease) increase in notes payable and other borrowings, net	-22,396,000	-306,786,000	226,050,000
Repayment of subordinated notes	-15,000,000	-20,000,000	-15,000,000
Excess tax benefits from stock-based compensation arrangements	474,000	841,000	306,000
Net proceeds from issuance of Series C preferred stock	0	122,690,000	0
Issuance of common shares resulting from exercise of stock options, employee stock purchase plan and conversion of common stock warrants	19,113,000	14,891,000	3,586,000
Dividends paid	-13,893,000	-13,157,000	-10,344,000
Common stock repurchases	-3,504,000	-7,726,000	-112,000
Net Cash (Used for) Provided by Financing Activities	-132,152,000	372,545,000	589,821,000
Net Increase (Decrease) in Cash and Cash Equivalents	-51,164,000	145,324,000	-2,876,000
Cash and Cash Equivalents at Beginning of Period	315,028,000	169,704,000	172,580,000
Cash and Cash Equivalents at End of Period	263,864,000	315,028,000	169,704,000
Parent Company [Member]	'	'	'
Operating Activities:	'	'	'
Net income	137,210,000	111,196,000	77,575,000
Adjustments to reconcile net income to net cash provided by (used for) operating activities	'	'	'
Provision for credit losses	1,765,000	8,050,000	608,000
Losses (gains) on available-for-sale securities, net	-111,000	-64,000	-164,000
Depreciation and amortization	3,744,000	3,072,000	2,178,000
Deferred income tax expense (benefit)	1,217,000	2,224,000	-1,785,000
Stock-based compensation expense	6,799,000	9,072,000	2,008,000
Tax (expense) benefit from stock-based compensation arrangements	-831,000	1,392,000	129,000
Excess tax benefits from stock-based compensation arrangements	-112,000	-483,000	-19,000
Increase in other assets	-3,051,000	-53,892,000	-28,389,000
(Decrease) increase in other liabilities	-4,517,000	-1,619,000	122,000
Equity in undistributed net income of subsidiaries	-55,724,000	-104,415,000	-78,356,000
Net Cash Provided by (Used for) Operating Activities	86,389,000	-25,467,000	-26,093,000
Investing Activities:	'	'	'
Capital contributions to subsidiaries, net	-8,293,000	-53,807,000	-22,361,000
Other investing activity, net	-21,206,000	-12,284,000	440,000
Net Cash Used for Investing Activities	-29,499,000	-66,091,000	-21,921,000
Financing Activities:	'	'	'
(Decrease) increase in notes payable and other borrowings, net	-17,860,000	-44,887,000	36,337,000
Repayment of subordinated notes	-15,000,000	-20,000,000	-15,000,000
Excess tax benefits from stock-based compensation arrangements	112,000	483,000	19,000
Net proceeds from issuance of Series C preferred stock	0	122,690,000	0
Issuance of common shares resulting from exercise of stock options, employee stock purchase plan and conversion of common stock warrants	19,113,000	14,891,000	3,586,000
Dividends paid	-13,893,000	-13,157,000	-10,344,000
Common stock repurchases	-3,504,000	-7,726,000	-112,000
Net Cash (Used for) Provided by Financing Activities	-31,032,000	52,294,000	14,486,000
Net Increase (Decrease) in Cash and Cash Equivalents	25,858,000	-39,264,000	-33,528,000
Cash and Cash Equivalents at Beginning of Period	55,011,000	94,275,000	127,803,000
Cash and Cash Equivalents at End of Period	$80,869,000	$55,011,000	$94,275,000

Earnings_Per_Share_Computation

Earnings Per Share (Computation Of Basic And Diluted Earnings Per Common Share) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Share [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Net income	$35,288	$35,563	$34,307	$32,052	$30,089	$32,302	$25,595	$23,210	$137,210	$111,196	$77,575
Less: Preferred stock dividends and discount accretion	1,581	1,581	2,617	2,616	2,616	2,616	2,644	1,246	8,395	9,093	4,128
Net income applicable to common shares - Basic	33,707	33,982	31,690	29,436	27,473	29,686	22,951	21,964	128,815	102,103	73,447
Add: Dividends on convertible preferred stock	'	'	'	'	'	'	'	'	8,325	8,955	0
Net income applicable to common shares - Diluted	'	'	'	'	'	'	'	'	$137,140	$111,058	$73,447
Weighted average common shares outstanding (in shares)	'	'	'	'	'	'	'	'	38,699	36,365	35,355
Common stock equivalents (in shares)	'	'	'	'	'	'	'	'	7,108	7,313	8,636
Convertible preferred stock, if dilutive (in shares)	'	'	'	'	'	'	'	'	4,141	4,356	0
Total dilutive potential common shares (in shares)	'	'	'	'	'	'	'	'	11,249	11,669	8,636
Weighted average common shares and effect of dilutive potential common shares (in shares)	'	'	'	'	'	'	'	'	49,948	48,034	43,991
Net income per common share - Basic (in usd per share)	$0.82	$0.86	$0.85	$0.80	$0.75	$0.82	$0.63	$0.61	$3.33	$2.81	$2.08
Net income per common share - Diluted (in usd per share)	$0.70	$0.71	$0.69	$0.65	$0.61	$0.66	$0.52	$0.50	$2.75	$2.31	$1.67

Quarterly_Financial_Summary_Un2

Quarterly Financial Summary (Unaudited) (Summary Of Quarterly Financial Information) (Details) (USD $)	1 Months Ended	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jan. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]	'	'	'	'	'	'	'	'	'	'	'	'
Interest income	'	$160,582	$161,168	$156,646	$152,313	$156,643	$158,201	$155,691	$156,486	$630,709	$627,021	$605,793
Interest expense	'	18,274	19,386	20,822	21,600	23,867	25,626	27,421	30,591	80,082	107,505	144,416
Net interest income	'	142,308	141,782	135,824	130,713	132,776	132,575	128,270	125,895	550,627	519,516	461,377
Provision for credit losses	'	3,850	11,114	15,382	15,687	19,546	18,799	20,691	17,400	46,033	76,436	102,638
Net interest income after provision for credit losses	'	138,458	130,668	120,442	115,026	113,230	113,776	107,579	108,495	504,594	443,080	358,739
Non-interest income, excluding net securities gains (losses)	'	49,689	54,587	63,993	57,128	62,628	62,536	49,826	46,207	'	'	'
(Losses) gains on available-for-sale securities, net	'	-3,328	75	2	251	2,561	409	1,109	816	-3,000	4,895	1,792
Non-interest expense	'	126,997	127,248	128,187	120,119	129,548	124,548	117,185	117,759	502,551	489,040	420,404
Income before taxes	'	57,822	58,082	56,250	52,286	48,871	52,173	41,329	37,759	224,440	180,132	128,033
Income tax expense	'	22,534	22,519	21,943	20,234	18,782	19,871	15,734	14,549	87,230	68,936	50,458
Net income	'	35,288	35,563	34,307	32,052	30,089	32,302	25,595	23,210	137,210	111,196	77,575
Preferred stock dividends and discount accretion	'	1,581	1,581	2,617	2,616	2,616	2,616	2,644	1,246	8,395	9,093	4,128
Net income applicable to common shares	'	$33,707	$33,982	$31,690	$29,436	$27,473	$29,686	$22,951	$21,964	$128,815	$102,103	$73,447
Net income per common share:	'	'	'	'	'	'	'	'	'	'	'	'
Basic (in usd per share)	'	$0.82	$0.86	$0.85	$0.80	$0.75	$0.82	$0.63	$0.61	$3.33	$2.81	$2.08
Diluted (in usd per share)	'	$0.70	$0.71	$0.69	$0.65	$0.61	$0.66	$0.52	$0.50	$2.75	$2.31	$1.67
Cash dividends declared per common share (in usd per share)	$0.10	$0	$0.09	$0	$0.09	$0	$0.09	$0	$0.09	$0.18	$0.18	$0.18