Wintrust Financial (WTFC) 10-Q 8 May 14 2014 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2014	Apr. 30, 2014
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	31-Mar-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q1	'
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	'	46,541,444

Consolidated_Statements_Of_Con

Consolidated Statements Of Condition (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Assets	'	'	'
Cash and due from banks	$330,262,000	$253,408,000	$199,575,000
Federal funds sold and securities purchased under resale agreements	12,476,000	10,456,000	13,626,000
Interest-bearing deposits with other banks	540,964,000	495,574,000	685,302,000
Available-for-sale securities, at fair value	1,949,697,000	2,176,290,000	1,870,831,000
Trading account securities	1,068,000	497,000	1,036,000
Federal Home Loan Bank and Federal Reserve Bank stock	78,524,000	79,261,000	76,601,000
Brokerage customer receivables	26,884,000	30,953,000	25,614,000
Mortgage loans held-for-sale	215,231,000	334,327,000	380,922,000
Loans, net of unearned income, excluding covered loans	13,133,160,000	12,896,602,000	11,900,312,000
Covered loans	312,478,000	346,431,000	518,661,000
Total loans	13,445,638,000	13,243,033,000	12,418,973,000
Less: Allowance for loan losses	92,275,000	96,922,000	110,348,000
Less: Allowance for covered loan losses	3,447,000	10,092,000	12,272,000
Net loans	13,349,916,000	13,136,019,000	12,296,353,000
Premises and equipment, net	531,763,000	531,947,000	504,803,000
FDIC indemnification asset	60,298,000	85,672,000	170,696,000
Accrued interest receivable and other assets	549,705,000	569,619,000	485,746,000
Trade date securities receivable	182,600,000	0	0
Goodwill	373,725,000	374,547,000	343,632,000
Other intangible assets	18,050,000	19,213,000	19,510,000
Total assets	18,221,163,000	18,097,783,000	17,074,247,000
Deposits:	'	'	'
Non-interest bearing	2,773,922,000	2,721,771,000	2,243,440,000
Interest bearing	12,355,123,000	11,947,018,000	11,719,317,000
Total deposits	15,129,045,000	14,668,789,000	13,962,757,000
Notes payable	182,000	364,000	31,911,000
Federal Home Loan Bank advances	387,672,000	417,762,000	414,032,000
Other borrowings	230,904,000	254,740,000	256,244,000
Subordinated notes	0	0	15,000,000
Junior subordinated debentures	249,493,000	249,493,000	249,493,000
Trade date securities payable	0	303,088,000	1,250,000
Accrued interest payable and other liabilities	283,724,000	302,958,000	317,872,000
Total liabilities	16,281,020,000	16,197,194,000	15,248,559,000
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 March 31, 2014, December 31, 2013, and March 31, 2013; 46,332,213 shares issued at March 31, 2014, 46,181,588 shares issued at December 31, 2013, and 37,272,279 shares issued at March 31, 2013	46,332,000	46,181,000	37,272,000
Surplus	1,122,233,000	1,117,032,000	1,040,098,000
Treasury stock, at cost, 73,253 shares at March 31, 2014, 65,005 shares at December 31, 2013, and 258,572 shares at March 31, 2013	-3,380,000	-3,000,000	-8,187,000
Retained earnings	705,234,000	676,935,000	581,131,000
Accumulated other comprehensive loss	-56,753,000	-63,036,000	-1,067,000
Total shareholders' equity	1,940,143,000	1,900,589,000	1,825,688,000
Total liabilities and shareholders' equity	$18,221,163,000	$18,097,783,000	$17,074,247,000

Consolidated_Statements_Of_Con1

Consolidated Statements Of Condition (Parenthetical) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
				Series A - $1,000 liquidation value; No shares issued and outstanding at March 31, 2014 and December 31, 2013, and 50,000 shares issued and outstanding at March 31, 2013	Series A - $1,000 liquidation value; No shares issued and outstanding at March 31, 2014 and December 31, 2013, and 50,000 shares issued and outstanding at March 31, 2013	Series A - $1,000 liquidation value; No shares issued and outstanding at March 31, 2014 and December 31, 2013, and 50,000 shares issued and outstanding at March 31, 2013	Series C - $1,000 liquidation value; 126,477 shares issued and outstanding at March 31, 2014 and December 31, 2013, and 126,500 shares issued and outstanding at March 31, 2013	Series C - $1,000 liquidation value; 126,477 shares issued and outstanding at March 31, 2014 and December 31, 2013, and 126,500 shares issued and outstanding at March 31, 2013	Series C - $1,000 liquidation value; 126,477 shares issued and outstanding at March 31, 2014 and December 31, 2013, and 126,500 shares issued and outstanding at March 31, 2013
Preferred stock, no par value	'	'	'	'	'	'	'	'	'
Preferred stock, 20,000,000 shares authorized	20,000,000	20,000,000	20,000,000	'	'	'	'	'	'
Preferred stock, $1,000 liquidation value	'	'	'	$1,000	$1,000	$1,000	$1,000	$1,000	$1,000
Preferred stock, shares issued	'	'	'	0	0	50,000	126,477	126,477	126,500
Preferred stock, shares outstanding	'	'	'	0	0	50,000	126,477	126,477	126,500
Common stock, no par value	'	'	'	'	'	'	'	'	'
Common stock, $1.00 stated value	$1	$1	$1	'	'	'	'	'	'
Common stock, 100,000,000 shares authorized	100,000,000	100,000,000	100,000,000	'	'	'	'	'	'
Common stock, shares issued	46,332,213	46,181,588	37,272,279	'	'	'	'	'	'
Treasury stock, shares	73,253	65,005	258,572	'	'	'	'	'	'

Consolidated_Statements_Of_Inc

Consolidated Statements Of Income (Unaudited) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Interest income	'	'
Interest and fees on loans	$147,030	$142,114
Interest bearing deposits with banks	249	569
Federal funds sold and securities purchased under resale agreements	4	15
Securities	13,114	8,752
Trading account securities	9	5
Federal Home Loan Bank and Federal Reserve Bank stock	711	684
Brokerage customer receivables	209	174
Total interest income	161,326	152,313
Interest expense	'	'
Interest on deposits	11,923	14,504
Interest on Federal Home Loan Bank advances	2,643	2,764
Interest on notes payable and other borrowings	750	1,154
Interest on subordinated notes	0	59
Interest on junior subordinated debentures	2,004	3,119
Total interest expense	17,320	21,600
Net interest income	144,006	130,713
Provision for credit losses	1,880	15,687
Net interest income after provision for credit losses	142,126	115,026
Non-interest income	'	'
Wealth management	16,813	14,828
Mortgage banking	16,428	30,145
Service charges on deposit accounts	5,346	4,793
(Losses) gains on available-for-sale securities, net	-33	251
Fees from covered call options	1,542	1,639
Trading losses, net	-652	-435
Other	6,085	6,158
Total non-interest income	45,529	57,379
Non-interest expense	'	'
Salaries and employee benefits	79,934	77,513
Equipment	7,403	6,184
Occupancy, net	10,993	8,853
Data processing	4,715	4,599
Advertising and marketing	2,816	2,040
Professional fees	3,454	3,221
Amortization of other intangible assets	1,163	1,120
FDIC insurance	2,951	3,444
OREO expense (income), net	3,976	-1,620
Other	13,910	14,765
Total non-interest expense	131,315	120,119
Income before taxes	56,340	52,286
Income tax expense	21,840	20,234
Net income	34,500	32,052
Preferred stock dividends and discount accretion	1,581	2,616
Net income applicable to common shares	$32,919	$29,436
Net income per common share-Basic (in usd per share)	$0.71	$0.80
Net income per common share-Diluted (in usd per share)	$0.68	$0.65
Cash dividends declared per common share	$0.10	$0.09
Weighted average common shares outstanding	46,195	36,976
Dilutive potential common shares	4,509	12,463
Average common shares and dilutive common shares	50,704	49,439

Consolidated_Statements_Of_Com

Consolidated Statements Of Comprehensive Income (Unaudited) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Statement of Comprehensive Income [Abstract]	'	'
Net income	$34,500	$32,052
Unrealized gains (losses) on securities	'	'
Before tax	22,526	-7,455
Tax effect	-8,804	2,806
Net of tax	13,722	-4,649
Less: Reclassification of net (losses) gains included in net income	'	'
Before tax	-33	251
Tax effect	13	-100
Net of tax	-20	151
Net unrealized gains (losses) on securities	13,742	-4,800
Unrealized (losses) gains on derivative instruments	'	'
Before tax	-98	1,474
Tax effect	39	-586
Net unrealized (losses) gains on derivative instruments	-59	888
Foreign currency translation adjustment	'	'
Before tax	-9,959	-6,304
Tax effect	2,559	1,438
Net foreign currency translation adjustment	-7,400	-4,866
Total other comprehensive income (loss)	6,283	-8,778
Comprehensive income	$40,783	$23,274

Consolidated_Statements_Of_Cha

Consolidated Statements Of Changes In Shareholders Equity (Unaudited) (USD $)	Total	Preferred stock	Common stock	Surplus	Treasury stock	Retained earnings	Accumulated other comprehensive income (loss)
In Thousands, unless otherwise specified
Balance at Dec. 31, 2012	$1,804,705	$176,406	$37,108	$1,036,295	($7,838)	$555,023	$7,711
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'	'	'
Net income	32,052	'	'	'	'	32,052	'
Other comprehensive (loss) income, net of tax	-8,778	'	'	'	'	'	-8,778
Cash dividends declared on common stock	-3,328	'	'	'	'	-3,328	'
Dividends on preferred stock	-2,581	'	'	'	'	-2,581	'
Accretion on preferred stock	0	35	'	'	'	-35	'
Stock-based compensation	2,413	'	'	2,413	0	'	'
Common stock issued for:	'	'	'	'	'	'	'
Exercise of stock options and warrants	115	'	9	320	-214	'	'
Restricted stock awards	66	'	111	90	-135	'	'
Employee stock purchase plan	641	'	13	628	'	'	'
Director compensation plan	383	'	31	352	'	'	'
Balance at Mar. 31, 2013	1,825,688	176,441	37,272	1,040,098	-8,187	581,131	-1,067
Balance at Dec. 31, 2013	1,900,589	126,477	46,181	1,117,032	-3,000	676,935	-63,036
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'	'	'
Net income	34,500	'	'	'	'	34,500	0
Other comprehensive (loss) income, net of tax	6,283	'	'	'	'	'	6,283
Cash dividends declared on common stock	-4,620	'	'	'	'	-4,620	'
Dividends on preferred stock	-1,581	'	'	'	'	-1,581	'
Stock-based compensation	1,681	'	'	1,681	'	'	'
Common stock issued for:	'	'	'	'	'	'	'
Exercise of stock options and warrants	2,270	'	77	2,464	-271	'	'
Restricted stock awards	43	'	41	111	-109	'	'
Employee stock purchase plan	600	'	13	587	'	'	'
Director compensation plan	378	'	20	358	'	'	'
Balance at Mar. 31, 2014	$1,940,143	$126,477	$46,332	$1,122,233	($3,380)	$705,234	($56,753)

Consolidated_Statements_Of_Cas

Consolidated Statements Of Cash Flows (Unaudited) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Operating Activities:	'	'
Net income	$34,500	$32,052
Adjustments to reconcile net income to net cash provided by operating activities	'	'
Provision for credit losses	1,880	15,687
Depreciation and amortization	7,753	6,782
Stock-based compensation expense	1,681	2,413
Tax benefit from stock-based compensation arrangements	3	200
Excess tax benefits from stock-based compensation arrangements	-156	-222
Net amortization of premium on securities	233	3,424
Mortgage servicing rights fair value change, net	253	-273
Originations and purchases of mortgage loans held-for-sale	-527,272	-974,432
Proceeds from sales of mortgage loans held-for-sale	658,588	1,033,129
Increase in trading securities, net	-571	-453
Net decrease (increase) in brokerage customer receivables	4,069	-750
Gains on mortgage loans sold	-12,220	-27,419
Losses (gains) on available-for-sale securities, net	33	-251
Loss on sales of premises and equipment, net	795	1
Net loss (gains) on sales and fair value adjustments of other real estate owned	2,460	-2,658
Decrease in accrued interest receivable and other assets, net	27,584	32,068
Decrease in accrued interest payable and other liabilities, net	-37,348	-19,617
Net Cash Provided by Operating Activities	162,265	99,681
Investing Activities:	'	'
Proceeds from maturities of available-for-sale securities	98,007	67,941
Proceeds from sales of available-for-sale securities	14,800	41,056
Purchases of available-for-sale securities	-349,979	-192,379
Divestiture of operations	0	-149,100
Proceeds from sales of other real estate owned	20,362	30,641
Proceeds received from the FDIC related to reimbursements on covered assets	9,669	13,932
Net (increase) decrease in interest-bearing deposits with banks	-45,390	350,441
Net increase in loans	-227,040	-52,143
Purchases of premises and equipment, net	-7,596	-6,508
Net Cash (Used for) Provided by Investing Activities	-487,167	103,881
Financing Activities:	'	'
Increase (decrease) in deposit accounts	460,551	-314,618
(Decrease) increase in other borrowings, net	-24,018	11,576
Decrease in Federal Home Loan Bank advances, net	-30,000	0
Excess tax benefits from stock-based compensation arrangements	156	222
Issuance of common shares resulting from exercise of stock options, employee stock purchase plan and conversion of common stock warrants	3,668	1,354
Common stock repurchases	-380	-349
Dividends paid	-6,201	-3,574
Net Cash Provided by (Used for) Financing Activities	403,776	-305,389
Net Increase (Decrease) in Cash and Cash Equivalents	78,874	-101,827
Cash and Cash Equivalents at Beginning of Period	263,864	315,028
Cash and Cash Equivalents at End of Period	$342,738	$213,201

Basis_of_Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2014
Accounting Policies [Abstract]	'
Basis of Presentation	'
	Basis of Presentation
	The consolidated financial statements of Wintrust Financial Corporation and Subsidiaries (“Wintrust” or “the Company”) presented herein are unaudited, but in the opinion of management reflect all necessary adjustments of a normal or recurring nature for a fair presentation of results as of the dates and for the periods covered by the consolidated financial statements.
	The accompanying consolidated financial statements are unaudited and do not include information or footnotes necessary for a complete presentation of financial condition, results of operations or cash flows in accordance with U.S. generally accepted accounting principles ("GAAP"). The consolidated financial statements should be read in conjunction with the consolidated financial statements and notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2013 (“2013 Form 10-K”). Operating results reported for the three-month periods are not necessarily indicative of the results which may be expected for the entire year. Reclassifications of certain prior period amounts have been made to conform to the current period presentation.
	The preparation of the financial statements requires management to make estimates, assumptions and judgments that affect the reported amounts of assets and liabilities. Management believes that the estimates made are reasonable, however, changes in estimates may be required if economic or other conditions develop differently from management’s expectations. Certain policies and accounting principles inherently have a greater reliance on the use of estimates, assumptions and judgments and as such have a greater possibility of producing results that could be materially different than originally reported. Management views critical accounting policies to be those which are highly dependent on subjective or complex judgments, estimates and assumptions, and where changes in those estimates and assumptions could have a significant impact on the financial statements. Management currently views the determination of the allowance for loan losses, allowance for covered loan losses and the allowance for losses on lending-related commitments, loans acquired with evidence of credit quality deterioration since origination, estimations of fair value, the valuations required for impairment testing of goodwill, the valuation and accounting for derivative instruments and income taxes as the accounting areas that require the most subjective and complex judgments, and as such could be the most subject to revision as new information becomes available. Descriptions of our significant accounting policies are included in Note 1 - “Summary of Significant Accounting Policies” of the Company’s 2013 Form 10-K.

Recent_Accounting_Developments

Recent Accounting Developments	3 Months Ended
	Mar. 31, 2014
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]	'
New Accounting Pronouncements and Changes in Accounting Principles	'
	Recent Accounting Developments
	Accounting for Investments in Qualified Affordable Housing Projects
	In January 2014, the FASB issued ASU No. 2014-01, “Investments - Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Qualified Affordable Housing Projects,” to provide guidance on accounting for investments by a reporting entity in flow-through limited liability entities that invest in affordable housing projects that qualify for the low-income housing tax credit. This ASU permits new accounting treatment, if certain conditions are met, which allows the Company to amortize the initial cost of an investment in proportion to the amount of tax credits and other tax benefits received with recognition of the investment performance in income tax expense. This guidance is effective for fiscal years beginning after December 15, 2014 and is to be applied retrospectively. The Company does not expect this guidance to have a material impact on the Company’s consolidated financial statements.
	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.

Business_Combinations

Business Combinations	3 Months Ended
	Mar. 31, 2014
Business Combinations [Abstract]	'
Business Combinations	'
	Business Combinations
	Non-FDIC Assisted Bank Acquisitions
	On October 18, 2013, the Company acquired Diamond Bancorp, Inc. ("Diamond"). Diamond was the parent company of Diamond Bank, FSB ("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 Community Bank & Trust Company ("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 First Lansing Bancorp, Inc. ("FLB"). FLB was the parent company of First National Bank of Illinois ("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 Community Bank, N.A. ("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.
	See Note 17—Subsequent Events for discussion regarding the Company's announcements in April 2014 of the signing of a definitive agreement to acquire certain branch offices and deposits of Talmer Bank & Trust, and a branch of THE National Bank.
	FDIC-Assisted Transactions
	Since 2010, the Company acquired the banking operations, including the acquisition of certain assets and the assumption of liabilities, of nine financial institutions in FDIC-assisted transactions. 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, other real estate owned (“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.
	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 7 — 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 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 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:
		Three Months Ended
	(Dollars in thousands)	31-Mar-14			31-Mar-13
	Balance at beginning of period	$	85,672		$	208,160
	Additions from acquisitions	—			—
	Additions from reimbursable expenses	1,282			5,033
	Amortization	(1,603		)	(2,468		)
	Changes in expected reimbursements from the FDIC for changes in expected credit losses	(15,384		)	(26,097		)
	Payments received from the FDIC	(9,669		)	(13,932		)
	Balance at end of period	$	60,298		$	170,696
	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 Savings and Loan Association of Chicago ("Second Federal") to an unaffiliated financial institution. Through this transaction, the Company divested approximately $149 million of related deposits.
	Mortgage Banking Acquisitions
	On October 1, 2013, the Company acquired certain assets and assumed certain liabilities of the mortgage banking business of Surety Financial Services ("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.
	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 generally 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 6—Loans, for more information on loans acquired with evidence of credit quality deterioration since origination.

Cash_and_Cash_Equivalents

Cash and Cash Equivalents	3 Months Ended
	Mar. 31, 2014
Cash and Cash Equivalents [Abstract]	'
Cash and Cash Equivalents	'
	Cash and Cash Equivalents
	For purposes of the Consolidated Statements of Cash Flows, the Company considers cash and cash equivalents to include 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.

AvailableForSale_Securities

Available-For-Sale Securities	3 Months Ended
	Mar. 31, 2014
Available-for-sale Securities [Abstract]	'
Investments in Debt and Marketable Equity Securities	'
	Available-For-Sale Securities
	The following tables are a summary of the available-for-sale securities portfolio as of the dates shown:
		31-Mar-14
	(Dollars in thousands)	Amortized			Gross			Gross			Fair
		Cost			Unrealized			Unrealized			Value
					Gains			Losses
	U.S. Treasury	$	354,109		$	263		$	(14,194	)	$	340,178
	U.S. Government agencies	874,845			3,286			(49,856		)	828,275
	Municipal	175,028			3,439			(3,167		)	175,300
	Corporate notes:
	Financial issuers	129,413			2,306			(1,735		)	129,984
	Other	4,986			100			(3		)	5,083
	Mortgage-backed: (1)
	Mortgage-backed securities	371,825			3,919			(13,188		)	362,556
	Collateralized mortgage obligations	55,190			356			(799		)	54,747
	Other equity securities	50,570			3,543			(539		)	53,574
	Total available-for-sale securities	$	2,015,966		$	17,212		$	(83,481	)	$	1,949,697
		31-Dec-13
		Amortized			Gross			Gross			Fair
		Cost			Unrealized			Unrealized			Value
	(Dollars in thousands)				Gains			Losses
	U.S. Treasury	$	354,262		$	141		$	(18,308	)	$	336,095
	U.S. Government agencies	950,086			1,680			(56,078		)	895,688
	Municipal	154,463			2,551			(4,298		)	152,716
	Corporate notes:
	Financial issuers	129,362			1,993			(2,411		)	128,944
	Other	5,994			105			(5		)	6,094
	Mortgage-backed: (1)
	Mortgage-backed securities	562,708			3,537			(18,047		)	548,198
	Collateralized mortgage obligations	57,711			258			(942		)	57,027
	Other equity securities	50,532			1,493			(497		)	51,528
	Total available-for-sale securities	$	2,265,118		$	11,758		$	(100,586	)	$	2,176,290
		31-Mar-13
		Amortized			Gross			Gross			Fair
		Cost			Unrealized			Unrealized			Value
	(Dollars in thousands)				Gains			Losses
	U.S. Treasury	$	220,215		$	190		$	(2,760	)	$	217,645
	U.S. Government agencies	975,386			2,960			(4,631		)	973,715
	Municipal	107,947			2,628			(316		)	110,259
	Corporate notes:
	Financial issuers	136,761			2,569			(2,280		)	137,050
	Other	11,628			195			—			11,823
	Mortgage-backed: (1)
	Mortgage-backed securities	294,728			7,360			(3,194		)	298,894
	Collateralized mortgage obligations	68,496			897			(5		)	69,388
	Other equity securities	52,413			745			(1,101		)	52,057
	Total available-for-sale securities	$	1,867,574		$	17,544		$	(14,287	)	$	1,870,831
	-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 March 31, 2014:
		Continuous unrealized						Continuous unrealized						Total
		losses existing for						losses existing for
		less than 12 months						greater than 12 months
	(Dollars in thousands)	Fair Value			Unrealized Losses			Fair Value			Unrealized Losses			Fair Value		Unrealized Losses
	U.S. Treasury	$	—		$	—		$	185,969		$	(14,194	)	$	185,969	$	(14,194	)
	U.S. Government agencies	463,254			(42,295		)	54,128			(7,561		)	517,382		(49,856		)
	Municipal	61,280			(2,683		)	9,484			(484		)	70,764		(3,167		)
	Corporate notes:
	Financial issuers	1,327			(10		)	57,474			(1,725		)	58,801		(1,735		)
	Other	997			(3		)	—			—			997		(3		)
	Mortgage-backed:
	Mortgage-backed securities	137,042			(1,352		)	137,661			(11,836		)	274,703		(13,188		)
	Collateralized mortgage obligations	21,045			(275		)	11,944			(524		)	32,989		(799		)
	Other equity securities	8,296			(213		)	5,674			(326		)	13,970		(539		)
Total	$	693,241		$	(46,831	)	$	462,334		$	(36,650	)	$	1,155,575	$	(83,481	)
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 March 31, 2014 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, mortgage-backed securities, and agency bonds. Unrealized losses recognized on treasury notes, mortgage backed securities and agency bonds are the result of increases in yields for similar types of securities which have a longer duration and maturity.
The following table provides information as to the amount of gross gains and gross losses realized and proceeds received through the sales of available-for-sale investment securities:
	Three months ended March 31,
(Dollars in thousands)	2014			2013
Realized gains	$	55		$	313
Realized losses	(88		)	(62		)
Net realized (losses) gains	$	(33	)	$	251
Other than temporary impairment charges	—			—
(Losses) gains on available-for-sale securities, net	$	(33	)	$	251
Proceeds from sales of available-for-sale securities	$	14,800		$	41,056
The amortized cost and fair value of securities as of March 31, 2014, December 31, 2013 and March 31, 2013, 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:
	31-Mar-14						31-Dec-13						31-Mar-13
(Dollars in thousands)	Amortized Cost			Fair Value			Amortized Cost			Fair Value			Amortized Cost		Fair Value
Due in one year or less	$	203,749		$	203,942		$	268,847		$	269,168		$	247,388	$	247,836
Due in one to five years	338,130			338,980			358,108			358,357			337,431		338,633
Due in five to ten years	344,296			330,546			350,372			330,020			357,677		356,871
Due after ten years	652,206			605,352			616,840			561,992			509,441		507,152
Mortgage-backed	427,015			417,303			620,419			605,225			363,224		368,282
Other equity securities	50,570			53,574			50,532			51,528			52,413		52,057
Total available-for-sale securities	$	2,015,966		$	1,949,697		$	2,265,118		$	2,176,290		$	1,867,574	$	1,870,831
Securities having a carrying value of $1.2 billion at March 31, 2014, $1.2 billion at December 31, 2013 and $1.1 billion March 31, 2013, were pledged as collateral for public deposits, trust deposits, FHLB advances, securities sold under repurchase agreements and derivatives. At March 31, 2014, there were no securities of a single issuer, other than U.S. Government-sponsored agency securities, which exceeded 10% of shareholders’ equity.

Loans

Loans	3 Months Ended
	Mar. 31, 2014
Loans and Leases Receivable Disclosure [Abstract]	'
Loans	'
	Loans
	The following table shows the Company’s loan portfolio by category as of the dates shown:
		March 31,			December 31,			March 31,
	(Dollars in thousands)	2014			2013			2013
	Balance:
	Commercial	$	3,439,197		$	3,253,687		$	2,872,695
	Commercial real-estate	4,262,255			4,230,035			3,990,465
	Home equity	707,748			719,137			759,218
	Residential real-estate	426,769			434,992			360,652
	Premium finance receivables—commercial	2,208,361			2,167,565			1,997,160
	Premium finance receivables—life insurance	1,929,334			1,923,698			1,753,512
	Consumer and other	159,496			167,488			166,610
	Total loans, net of unearned income, excluding covered loans	$	13,133,160		$	12,896,602		$	11,900,312
	Covered loans	312,478			346,431			518,661
	Total loans	$	13,445,638		$	13,243,033		$	12,418,973
	Mix:
	Commercial	26		%	25		%	23		%
	Commercial real-estate	32			32			32
	Home equity	5			5			6
	Residential real-estate	3			3			3
	Premium finance receivables—commercial	17			16			16
	Premium finance receivables—life insurance	14			15			14
	Consumer and other	1			1			2
	Total loans, net of unearned income, excluding covered loans	98		%	97		%	96		%
	Covered loans	2			3			4
	Total loans	100		%	100		%	100		%
	Certain premium finance receivables are recorded net of unearned income. The unearned income portions of such premium finance receivables were $40.3 million at March 31, 2014, $41.9 million at December 31, 2013 and $40.0 million at March 31, 2013, respectively. Certain life insurance premium finance receivables attributable to the life insurance premium finance loan acquisition in 2009 as well as purchased credit impaired ("PCI") 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 PCI loans, include net deferred loan fees and costs and fair value purchase accounting adjustments totaling $(6.2) million at March 31, 2014, $(9.2) million at December 31, 2013 and $10.5 million at March 31, 2013. The net credit balances at March 31, 2014 and December 31, 2013 are primarily the result of purchase accounting adjustments related to the acquisition of FNBI and Diamond during 2013.
	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. 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 ensure 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—PCI Loans
	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-Mar-14						31-Dec-13
		Unpaid			Carrying			Unpaid			Carrying
		Principal						Principal
	(Dollars in thousands)	Balance			Value			Balance			Value
	Bank acquisitions	$	407,157		$	303,362		$	453,944		$	338,517
	Life insurance premium finance loans acquisition	424,680			413,202			437,155			423,906
	See Note 7—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 PCI loans at March 31, 2014.
	Accretable Yield Activity
	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:
		Three Months Ended						Three Months Ended
		31-Mar-14						31-Mar-13
	(Dollars in thousands)	Bank Acquisitions			Life Insurance			Bank			Life Insurance
					Premium Finance Loans			Acquisitions			Premium
											Finance Loans
	Accretable yield, beginning balance	$	107,655		$	8,254		$	143,224		$	13,055
	Acquisitions	—			—			(78		)	—
	Accretable yield amortized to interest income	(7,770		)	(1,771		)	(9,577		)	(2,019		)
	Accretable yield amortized to indemnification asset (1)	(5,648		)	—			(8,706		)	—
	Reclassification from non-accretable difference (2)	8,580			—			5,412			—
	(Decreases) increases in interest cash flows due to payments and changes in interest rates	(5,143		)	78			(8,550		)	182
	Accretable yield, ending balance (3)	$	97,674		$	6,561		$	121,725		$	11,218
	-1	Represents the portion of the current period accreted yield, resulting from lower expected losses, applied to reduce the loss share indemnification asset.
	-2	Reclassification is the result of subsequent increases in expected principal cash flows.
	-3	As of March 31, 2014, the Company estimates that the remaining accretable yield balance to be amortized to the indemnification asset for the bank acquisitions is $28.1 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 $7.8 million and $9.6 million in the first quarter of 2014 and 2013, 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	3 Months Ended
	Mar. 31, 2014
Loans and Leases Receivable, Allowance [Abstract]	'
Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and 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 March 31, 2014, December 31, 2013 and March 31, 2013:
	As of March 31, 2014					90+ days and still accruing				60-89 days past due				30-59 days past due
	(Dollars in thousands)	Nonaccrual																Current				Total Loans
	Loan Balances:
	Commercial
	Commercial and industrial	$	11,112			$	387			$	2,235			$	16,150			$	1,965,425			$	1,995,309
	Franchise	—				—				—				75				221,026				221,101
	Mortgage warehouse lines of credit	—				—				—				—				60,809				60,809
	Community Advantage—homeowners association	—				—				—				—				91,414				91,414
	Aircraft	—				—				—				—				8,840				8,840
	Asset-based lending	670				—				—				10,573				729,425				740,668
	Tax exempt	—				—				—				—				177,973				177,973
	Leases	—				—				—				—				121,986				121,986
	Other	—				—				—				—				10,261				10,261
	PCI - commercial (1)	—				1,079				—				865				8,892				10,836
	Total commercial	11,782				1,466				2,235				27,663				3,396,051				3,439,197
	Commercial real-estate:
	Residential construction	—				—				680				27				35,690				36,397
	Commercial construction	844				—				—				—				150,786				151,630
	Land	2,405				—				2,682				3,438				99,445				107,970
	Office	6,970				—				1,672				8,868				633,655				651,165
	Industrial	6,101				—				1,114				2,706				615,139				625,060
	Retail	9,540				—				217				3,089				664,584				677,430
	Multi-family	1,327				—				—				3,820				570,616				575,763
	Mixed use and other	6,546				—				6,626				10,744				1,337,320				1,361,236
	PCI - commercial real-estate (1)	—				21,073				2,791				6,169				45,571				75,604
	Total commercial real-estate	33,733				21,073				15,782				38,861				4,152,806				4,262,255
	Home equity	7,311				—				1,650				4,972				693,815				707,748
	Residential real estate	14,385				—				946				4,889				403,474				423,694
	PCI - residential real estate (1)	—				1,414				—				248				1,413				3,075
	Premium finance receivables
	Commercial insurance loans	14,517				6,808				5,600				20,777				2,160,659				2,208,361
	Life insurance loans	—				—				—				4,312				1,511,820				1,516,132
	PCI - life insurance loans (1)	—				—				—				—				413,202				413,202
	Consumer and other	1,144				57				213				550				157,290				159,254
	PCI - consumer and other (1)	—				48				—				20				174				242
	Total loans, net of unearned income, excluding covered loans	$	82,872			$	30,866			$	26,426			$	102,292			$	12,890,704			$	13,133,160
	Covered loans	9,136				35,831				6,682				7,042				253,787				312,478
	Total loans, net of unearned income	$	92,008			$	66,697			$	33,108			$	109,334			$	13,144,491			$	13,445,638
	-1	PCI 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.
	As of December 31, 2013					90+ days and still accruing				60-89 days past due				30-59 days past due
	(Dollars in thousands)	Nonaccrual																Current				Total Loans
	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
	PCI - commercial (1)	—				274				156				1,685				9,068				11,183
	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
PCI - 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
PCI - 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
PCI - life insurance loans (1)	—				—				—				—				423,906				423,906
Consumer and other	1,137				105				76				1,010				163,956				166,284
PCI - 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	PCI 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.
As of March 31, 2013					90+ days and still accruing				60-89 days past due				30-59 days past due
(Dollars in thousands)	Nonaccrual																Current				Total Loans
Loan Balances:
Commercial
Commercial and industrial	$	17,717			$	—			$	1,150			$	16,710			$	1,533,999			$	1,569,576
Franchise	125				—				—				76				194,310				194,511
Mortgage warehouse lines of credit	—				—				—				—				131,970				131,970
Community Advantage—homeowners association	—				—				—				—				82,763				82,763
Aircraft	—				—				—				—				14,112				14,112
Asset-based lending	531				—				483				5,518				680,723				687,255
Tax exempt	—				—				—				—				89,508				89,508
Leases	—				—				—				844				97,186				98,030
Other	—				—				—				—				127				127
PCI - commercial (1)	—				449				—				—				4,394				4,843
Total commercial	18,373				449				1,633				23,148				2,829,092				2,872,695
Commercial real-estate:
Residential construction	3,094				—				945				—				33,044				37,083
Commercial construction	1,086				—				9,521				—				151,751				162,358
Land	17,976				—				—				11,563				104,039				133,578
Office	3,564				—				8,990				4,797				567,333				584,684
Industrial	7,137				—				—				986				587,402				595,525
Retail	7,915				—				6,970				5,953				565,963				586,801
Multi-family	2,088				—				1,036				4,315				505,346				512,785
Mixed use and other	18,947				—				1,573				13,560				1,288,754				1,322,834
PCI - commercial real-estate (1)	—				1,866				251				3,333				49,367				54,817
Total commercial real-estate	61,807				1,866				29,286				44,507				3,852,999				3,990,465
Home equity	14,891				—				1,370				4,324				738,633				759,218
Residential real estate	9,606				—				782				8,680				340,751				359,819
PCI - residential real estate (1)	—				—				198				—				635				833
Premium finance receivables
Commercial insurance loans	12,068				7,677				4,647				19,323				1,953,445				1,997,160
Life insurance loans	20				2,256				—				1,340				1,250,165				1,253,781
PCI - life insurance loans (1)	—				—				—				—				499,731				499,731
Consumer and other	1,790				145				287				714				161,036				163,972
PCI - consumer and other (1)	—				—				—				20				2,618				2,638
Total loans, net of unearned income, excluding covered loans	$	118,555			$	12,393			$	38,203			$	102,056			$	11,629,105			$	11,900,312
Covered loans	1,820				115,482				1,454				12,268				387,637				518,661
Total loans, net of unearned income	$	120,375			$	127,875			$	39,657			$	114,324			$	12,016,742			$	12,418,973
-1	PCI 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.
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 PCI loans. 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 March 31, 2014, December 31, 2013 and March 31, 2013:
	Performing												Non-performing											Total
(Dollars in thousands)	March 31,				31-Dec-13				March 31,				31-Mar-14				31-Dec-13				31-Mar-13			March 31,			31-Dec-13		March 31,
	2014								2013															2014					2013
Loan Balances:
Commercial
Commercial and industrial	$	1,983,810			$	1,826,063			$	1,551,859			$	11,499			$	10,143			$	17,717		$	1,995,309		$	1,836,206	$	1,569,576
Franchise	221,101				220,383				194,386				—				—				125			221,101			220,383		194,511
Mortgage warehouse lines of credit	60,809				67,470				131,970				—				—				—			60,809			67,470		131,970
Community Advantage—homeowners association	91,414				90,894				82,763				—				—				—			91,414			90,894		82,763
Aircraft	8,840				10,241				14,112				—				—				—			8,840			10,241		14,112
Asset-based lending	739,998				734,456				686,724				670				637				531			740,668			735,093		687,255
Tax exempt	177,973				161,239				89,508				—				—				—			177,973			161,239		89,508
Leases	121,986				109,831				98,030				—				—				—			121,986			109,831		98,030
Other	10,261				11,147				127				—				—				—			10,261			11,147		127
PCI - commercial (1)	10,836				11,183				4,843				—				—				—			10,836			11,183		4,843
Total commercial	3,427,028				3,242,907				2,854,322				12,169				10,780				18,373			3,439,197			3,253,687		2,872,695
Commercial real-estate
Residential construction	36,397				38,351				33,989				—				149				3,094			36,397			38,500		37,083
Commercial construction	150,786				129,737				161,272				844				6,969				1,086			151,630			136,706		162,358
Land	105,565				103,971				115,602				2,405				2,814				17,976			107,970			106,785		133,578
Office	644,195				632,154				581,120				6,970				10,087				3,564			651,165			642,241		584,684
Industrial	618,959				628,284				588,388				6,101				5,654				7,137			625,060			633,938		595,525
Retail	667,890				645,397				578,886				9,540				10,862				7,915			677,430			656,259		586,801
Multi-family	574,436				564,502				510,697				1,327				2,035				2,088			575,763			566,537		512,785
Mixed use and other	1,354,690				1,364,136				1,303,887				6,546				8,318				18,947			1,361,236			1,372,454		1,322,834
PCI - commercial real-estate(1)	75,604				76,615				54,817				—				—				—			75,604			76,615		54,817
Total commercial real-estate	4,228,522				4,183,147				3,928,658				33,733				46,888				61,807			4,262,255			4,230,035		3,990,465
Home equity	700,437				709,066				744,327				7,311				10,071				14,891			707,748			719,137		759,218
Residential real-estate	409,309				417,151				350,213				14,385				14,974				9,606			423,694			432,125		359,819
PCI - residential real-estate (1)	3,075				2,867				833				—				—				—			3,075			2,867		833
Premium finance receivables
Commercial insurance loans	2,187,036				2,148,186				1,977,415				21,325				19,379				19,745			2,208,361			2,167,565		1,997,160
Life insurance loans	1,516,132				1,499,792				1,251,505				—				—				2,276			1,516,132			1,499,792		1,253,781
PCI - life insurance loans (1)	413,202				423,906				499,731				—				—				—			413,202			423,906		499,731
Consumer and other	158,053				165,042				162,037				1,201				1,242				1,935			159,254			166,284		163,972
PCI - consumer and other(1)	242				1,204				2,638				—				—				—			242			1,204		2,638
Total loans, net of unearned income, excluding covered loans	$	13,043,036			$	12,793,268			$	11,771,679			$	90,124			$	103,334			$	128,633		$	13,133,160		$	12,896,602	$	11,900,312
-1	PCI loans represent loans acquired with evidence of credit quality deterioration since origination, in accordance with ASC 310-30. See Note 6 - Loans for further discussion of these purchased loans.
A summary of activity in the allowance for credit losses by loan portfolio (excluding covered loans) for the three ended March 31, 2014 and 2013 is as follows:
Three months ended March 31, 2014					Commercial Real-estate								Residential Real-estate				Premium Finance Receivable				Consumer and Other			Total, Excluding Covered Loans
(Dollars in thousands)	Commercial								Home Equity
Allowance for credit losses
Allowance for loan losses at beginning of period	$	23,092			$	48,658			$	12,611			$	5,108			$	5,583			$	1,870		$	96,922
Other adjustments	(15		)		(121		)		(1		)		(2		)		(9		)		—			(148		)
Reclassification from (to) allowance for unfunded lending-related commitments	—				(18		)		—				—				—				—			(18		)
Charge-offs	(648		)		(4,493		)		(2,267		)		(226		)		(1,210		)		(173		)	(9,017		)
Recoveries	317				145				257				131				321				61			1,232
Provision for credit losses	1,943				434				366				(320		)		897				(16		)	3,304
Allowance for loan losses at period end	$	24,689			$	44,605			$	10,966			$	4,691			$	5,582			$	1,742		$	92,275
Allowance for unfunded lending-related commitments at period end	$	—			$	737			$	—			$	—			$	—			$	—		$	737
Allowance for credit losses at period end	$	24,689			$	45,342			$	10,966			$	4,691			$	5,582			$	1,742		$	93,012
Individually evaluated for impairment	3,107				4,041				596				455				—				95			8,294
Collectively evaluated for impairment	21,512				41,301				10,370				4,147				5,582				1,647			84,559
Loans acquired with deteriorated credit quality	70				—				—				89				—				—			159
Loans at period end
Individually evaluated for impairment	$	18,350			$	99,480			$	7,537			$	18,026			$	—			$	1,592		$	144,985
Collectively evaluated for impairment	3,410,011				4,087,171				700,211				405,668				3,724,493				157,662			12,485,216
Loans acquired with deteriorated credit quality	10,836				75,604				—				3,075				413,202				242			502,959
Three months ended March 31, 2013					Commercial Real-estate								Residential Real-estate				Premium Finance Receivable				Consumer and Other			Total, Excluding Covered Loans
(Dollars in thousands)	Commercial								Home Equity
Allowance for credit losses
Allowance for loan losses at beginning of period	$	28,794			$	52,135			$	12,734			$	5,560			$	6,096			$	2,032		$	107,351
Other adjustments	(3		)		(217		)		—				(9		)		—				—			(229		)
Reclassification from (to) allowance for unfunded lending-related commitments	—				(213		)		—				—				—				—			(213		)
Charge-offs	(4,540		)		(3,299		)		(2,397		)		(1,728		)		(1,068		)		(129		)	(13,161		)
Recoveries	295				368				162				5				294				109			1,233
Provision for credit losses	4,406				7,634				1,623				1,312				749				(357		)	15,367
Allowance for loan losses at period end	$	28,952			$	56,408			$	12,122			$	5,140			$	6,071			$	1,655		$	110,348
Allowance for unfunded lending-related commitments at period end	$	—			$	15,287			$	—			$	—			$	—			$	—		$	15,287
Allowance for credit losses at period end	$	28,952			$	71,695			$	12,122			$	5,140			$	6,071			$	1,655		$	125,635
Individually evaluated for impairment	3,682				23,089				1,748				598				—				156			29,273
Collectively evaluated for impairment	25,270				48,409				10,374				4,532				6,071				1,499			96,155
Loans acquired with deteriorated credit quality	—				197				—				10				—				—			207
Loans at period end
Individually evaluated for impairment	$	27,447			$	145,203			$	16,057			$	12,984			$	—			$	1,863		$	203,554
Collectively evaluated for impairment	2,840,405				3,790,445				743,161				346,835				3,250,941				162,109			11,133,896
Loans acquired with deteriorated credit quality	4,843				54,817				—				833				499,731				2,638			562,862
A summary of activity in the allowance for covered loan losses for the three months ended March 31, 2014 and 2013 is as follows:
	Three Months Ended
	March 31,				March 31,
(Dollars in thousands)	2014				2013
Balance at beginning of period	$	10,092			$	13,454
Provision for covered loan losses before benefit attributable to FDIC loss share agreements	(7,121		)		1,600
Benefit attributable to FDIC loss share agreements	5,697				(1,280		)
Net provision for covered loan losses	(1,424		)		320
(Decrease) increase in FDIC indemnification asset	(5,697		)		1,280
Loans charged-off	(2,864		)		(2,791		)
Recoveries of loans charged-off	3,340				9
Net recoveries (charge-offs)	476				(2,782		)
Balance at end of period	$	3,447			$	12,272
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 related to covered loans 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 3 – Business Combinations for more detail.
Impaired Loans
A summary of impaired loans, including troubled debt restructurings ("TDRs"), is as follows:
	March 31,				December 31,				March 31,
(Dollars in thousands)	2014				2013				2013
Impaired loans (included in non-performing and TDRs):
Impaired loans with an allowance for loan loss required (1)	$	86,381			$	92,184			$	101,565
Impaired loans with no allowance for loan loss required	56,596				70,045				101,989
Total impaired loans (2)	$	142,977			$	162,229			$	203,554
Allowance for loan losses related to impaired loans	$	8,197			$	8,265			$	14,607
TDRs	$	92,517			$	107,103			$	116,345
-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 for the periods ended as follows:
													For the Three Months Ended
	As of March 31, 2014												31-Mar-14
	Recorded Investment				Unpaid Principal Balance				Related Allowance				Average Recorded Investment				Interest Income Recognized
(Dollars in thousands)
Impaired loans with a related ASC 310 allowance recorded
Commercial
Commercial and industrial	$	9,167			$	10,029			$	2,459			$	9,340			$	120
Franchise	—				—				—				—				—
Mortgage warehouse lines of credit	—				—				—				—				—
Community Advantage—homeowners association	—				—				—				—				—
Aircraft	—				—				—				—				—
Asset-based lending	670				2,465				620				677				31
Tax exempt	—				—				—				—				—
Leases	—				—				—				—				—
Other	—				—				—				—				—
Commercial real-estate
Residential construction	—				—				—				—				—
Commercial construction	3,099				3,099				24				3,099				28
Land	9,260				9,625				174				9,688				79
Office	8,712				9,398				1,069				8,767				90
Industrial	6,597				6,765				513				5,985				81
Retail	12,763				12,903				826				12,819				132
Multi-family	2,053				2,143				122				2,057				23
Mixed use and other	25,420				25,591				1,272				25,853				291
Home equity	2,109				2,534				596				2,117				24
Residential real-estate	6,222				6,362				427				6,094				68
Premium finance receivables
Commercial insurance	—				—				—				—				—
Life insurance	—				—				—				—				—
PCI - life insurance	—				—				—				—				—
Consumer and other	309				367				95				290				5
Impaired loans with no related ASC 310 allowance recorded
Commercial
Commercial and industrial	$	7,789			$	14,415			$	—			$	8,179			$	208
Franchise	—				—				—				—				—
Mortgage warehouse lines of credit	—				—				—				—				—
Community Advantage—homeowners association	—				—				—				—				—
Aircraft	—				—				—				—				—
Asset-based lending	—				—				—				—				—
Tax exempt	—				—				—				—				—
Leases	—				—				—				—				—
Other	—				—				—				—				—
Commercial real-estate
Residential construction	891				891				—				1,245				12
Commercial construction	1,466				1,471				—				1,418				17
Land	4,982				8,764				—				4,985				109
Office	6,260				6,301				—				6,266				83
Industrial	2,298				2,470				—				2,314				47
Retail	10,419				12,273				—				11,006				140
Multi-family	1,078				2,013				—				1,201				23
Mixed use and other	3,161				5,044				—				3,096				67
Home equity	5,428				7,044				—				5,777				73
Residential real-estate	11,541				14,427				—				11,699				137
Premium finance receivables
Commercial insurance	—				—				—				—				—
Life insurance	—				—				—				—				—
PCI - life insurance	—				—				—				—				—
Consumer and other	1,283				1,809				—				1,285				27
Total loans, net of unearned income, excluding covered loans	$	142,977			$	168,203			$	8,197			$	145,257			$	1,915
													For the Twelve Months Ended
	As of December 31, 2013												31-Dec-13
	Recorded Investment				Unpaid Principal Balance				Related Allowance				Average Recorded Investment				Interest Income Recognized
(Dollars in thousands)
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	—				—				—				—				—
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	—				—				—				—				—
Consumer and other	1,322				1,865				—				1,355				115
Total loans, net of unearned income, excluding covered loans	$	162,229			$	195,455			$	8,265			$	170,658			$	8,920
													For the Three Months Ended
	As of March 31, 2013												31-Mar-13
	Recorded Investment				Unpaid Principal Balance				Related Allowance				Average Recorded Investment				Interest Income Recognized
(Dollars in thousands)
Impaired loans with a related ASC 310 allowance recorded
Commercial
Commercial and industrial	$	12,827			$	14,544			$	3,627			$	13,034			$	230
Franchise	—				—				—				—				—
Mortgage warehouse lines of credit	—				—				—				—				—
Community Advantage—homeowners association	—				—				—				—				—
Aircraft	—				—				—				—				—
Asset-based lending	511				511				55				511				7
Tax exempt	—				—				—				—				—
Leases	—				—				—				—				—
Other	—				—				—				—				—
Commercial real-estate
Residential construction	1,881				2,007				405				1,976				23
Commercial construction	8,682				8,682				49				8,983				86
Land	17,851				19,070				2,380				17,861				104
Office	5,792				5,996				659				5,853				61
Industrial	4,229				4,286				1,241				4,244				65
Retail	16,734				17,316				674				16,773				194
Multi-family	3,966				4,063				152				4,044				42
Mixed use and other	18,910				20,337				2,863				19,317				232
Home equity	5,160				5,751				1,748				5,488				57
Residential real-estate	4,357				4,974				598				4,365				49
Premium finance receivables
Commercial insurance	—				—				—				—				—
Life insurance	—				—				—				—				—
Purchased life insurance	—				—				—				—				—
Consumer and other	665				665				156				665				8
Impaired loans with no related ASC 310 allowance recorded
Commercial
Commercial and industrial	$	13,963			$	17,153			$	—			$	14,344			$	226
Franchise	125				1,544				—				1,189				26
Mortgage warehouse lines of credit	—				—				—				—				—
Community Advantage—homeowners association	—				—				—				—				—
Aircraft	—				—				—				—				—
Asset-based lending	21				1,358				—				23				18
Tax exempt	—				—				—				—				—
Leases	—				—				—				—				—
Other	—				—				—				—				—
Commercial real-estate
Residential construction	3,208				3,579				—				3,708				42
Commercial construction	3,970				4,450				—				4,016				49
Land	11,305				16,304				—				12,048				203
Office	8,283				8,357				—				8,306				95
Industrial	5,541				5,653				—				5,563				74
Retail	14,483				15,095				—				14,628				172
Multi-family	2,200				4,541				—				2,618				54
Mixed use and other	18,168				19,483				—				18,345				269
Home equity	10,897				13,179				—				11,395				131
Residential real-estate	8,627				9,053				—				8,703				94
Premium finance receivables
Commercial insurance	—				—				—				—				—
Life insurance	—				—				—				—				—
Purchased life insurance	—				—				—				—				—
Consumer and other	1,198				1,664				—				1,208				25
Total loans, net of unearned income, excluding covered loans	$	203,554			$	229,615			$	14,607			$	209,208			$	2,636
TDRs
At March 31, 2014, the Company had $92.5 million in loans modified in TDRs. The $92.5 million in TDRs represents 143 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 PCI loans, 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 PCI loans, 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 PCI loans, 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 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 the 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. 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 March 31, 2014 and approximately $4.0 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.  During the three months ended March 31, 2014 and 2013, the Company recorded $132,000 and $229,000, 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 three months ended March 31, 2014 and 2013, respectively, which represent TDRs:
Three months ended		Total (1)(2)							Extension at							Reduction of Interest							Modification to					Forgiveness of Debt(2)
31-Mar-14									Below Market							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		1			$	88			1			$	88			—			$	—			1		$	88		—	$	—
Commercial real-estate
Land		—			—				—			—				—			—				—		—			—	—
Industrial		1			1,078				1			1,078				—			—				1		1,078			—	—
Retail		1			202				1			202				—			—				—		—			—	—
Multi-family		—			—				—			—				—			—				—		—			—	—
Mixed use and other		3			3,877				2			2,604				3			3,877				1		1,273			—	—
Residential real estate and other		—			—				—			—				—			—				—		—			—	—
Total loans		6			$	5,245			5			$	3,972			3			$	3,877			3		$	2,439		—	$	—
Three months ended		Total (1)(2)							Extension at							Reduction of Interest							Modification to					Forgiveness of Debt(2)
31-Mar-13									Below Market							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
Land		2			287				2			287				2			287				—		—			1	73
Industrial		—			—				—			—				—			—				—		—			—	—
Retail		1			200				1			200				1			200				—		—			—	—
Multi-family		1			705				1			705				1			705				—		—			—	—
Mixed use and other		—			—				—			—				—			—				—		—			—	—
Residential real estate and other		4			377				2			70				3			361				1		123			—	—
Total loans		14			$	2,277			11			$	1,835			11			$	2,106			3		$	308		1	$	73
-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 three months ended March 31, 2014, six loans totaling $5.2 million were determined to be TDRs, compared to 14 loans totaling $2.3 million in the same period of 2013. Of these loans extended at below market terms, the weighted average extension had a term of approximately 13 months during the three months ended March 31, 2014 compared to 21 months for the same period of 2013. Further, the weighted average decrease in the stated interest rate for loans with a reduction of interest rate during the period was approximately 176 basis points and 153 basis points during the three months ending March 31, 2014 and 2013, respectively. Interest-only payment terms were approximately nine months during the three months ending March 31, 2014 compared to approximately eight months during the three months ending March 31, 2013. Additionally, no principal balances were forgiven in the first quarter of 2014 compared to $50,000 of principal balances forgiven during the same period of 2013.
The following table presents a summary of all loans restructured in TDRs during the twelve months ended March 31, 2014 and 2013, and such loans which were in payment default under the restructured terms during the respective periods below:
(Dollars in thousands)	Three Months Ended														Three Months Ended
	31-Mar-14														31-Mar-13
	Total (1)(3)							Payments in Default  (2)(3)							Total (1)(3)							Payments in Default  (2)(3)
	Count			Balance				Count			Balance				Count			Balance				Count		Balance
Commercial
Commercial and industrial	1			$	88			—			$	—			21			$	14,901			6		$	10,377
Commercial real-estate
Residential construction	—			—				—			—				3			2,147				—		—
Commercial construction	3			6,120				3			6,120				—			—				—		—
Land	1			2,352				—			—				5			4,131				1		651
Office	4			4,021				3			3,465				—			—				—		—
Industrial	2			2,027				—			—				1			727				—		—
Retail	1			202				—			—				4			5,085				—		—
Multi-family	—			—				—			—				2			1,085				1		705
Mixed use and other	9			8,919				2			399				12			6,061				4		2,603
Residential real estate and other	6			1,919				—			—				10			969				2		221
Total loans	27			$	25,648			8			$	9,984			58			$	35,106			14		$	14,557
-1	Total TDRs represent all loans restructured in TDRs during the previous twelve months from the date 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.

Goodwill_and_Other_Intangible_

Goodwill and Other Intangible Assets	3 Months Ended
	Mar. 31, 2014
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			March 31,
		2014			Acquired			Loss						2014
	Community banking	$	305,313		$	—		$	—		$	—		$	305,313
	Specialty finance	37,370			—			—			(822		)	36,548
	Wealth management	31,864			—			—			—			31,864
	Total	$	374,547		$	—		$	—		$	(822	)	$	373,725
	The specialty finance segment’s goodwill decreased $822,000 during the first quarter of 2014 as a result of 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 March 31, 2014 is as follows:
	(Dollars in thousands)	March 31,			31-Dec-13			March 31,
		2014						2013
	Community banking segment:
	Core deposit intangibles:
	Gross carrying amount	$	40,770		$	40,770		$	37,860
	Accumulated amortization	(30,209		)	(29,189		)	(26,127		)
	Net carrying amount	$	10,561		$	11,581		$	11,733
	Specialty finance segment:
	Customer list intangibles:
	Gross carrying amount	$	1,800		$	1,800		$	1,800
	Accumulated amortization	(842		)	(805		)	(688		)
	Net carrying amount	$	958		$	995		$	1,112
	Wealth management segment:
	Customer list and other intangibles:
	Gross carrying amount	$	7,690		$	7,690		$	7,390
	Accumulated amortization	(1,159		)	(1,053		)	(725		)
	Net carrying amount	$	6,531		$	6,637		$	6,665
	Total other intangible assets, net	$	18,050		$	19,213		$	19,510
	Estimated amortization
	Actual in three months ended March 31, 2014	$	1,163
	Estimated remaining in 2014	3,207
	Estimated—2015	2,791
	Estimated—2016	2,180
	Estimated—2017	1,764
	Estimated—2018	1,544
	The core deposit intangibles recognized in connection with prior bank acquisitions are amortized over a ten-year period 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 while the customer list intangibles recognized in connection with prior acquisitions within the wealth management segment are being amortized over a ten-year period on a straight-line basis.
	Total amortization expense associated with finite-lived intangibles totaled approximately $1.2 million and $1.1 million for the three months ended March 31, 2014 and 2013, respectively.

Deposits

Deposits	3 Months Ended
	Mar. 31, 2014
Deposits [Abstract]	'
Deposits	'
	Deposits
	The following table is a summary of deposits as of the dates shown:
	(Dollars in thousands)	March 31, 2014			December 31, 2013			March 31, 2013
	Balance:
	Non-interest bearing	$	2,773,922		$	2,721,771		$	2,243,440
	NOW	1,983,251			1,953,882			2,043,227
	Wealth management deposits	1,289,134			1,013,850			868,119
	Money market	3,454,271			3,359,999			2,879,636
	Savings	1,443,943			1,392,575			1,258,682
	Time certificates of deposit	4,184,524			4,226,712			4,669,653
	Total deposits	$	15,129,045		$	14,668,789		$	13,962,757
	Mix:
	Non-interest bearing	18		%	19		%	16		%
	NOW	13			13			15
	Wealth management deposits	8			7			6
	Money market	23			23			21
	Savings	10			9			9
	Time certificates of deposit	28			29			33
	Total deposits	100		%	100		%	100		%
	Wealth management deposits represent deposit balances (primarily money market accounts) at the Company’s subsidiary banks from brokerage customers of Wayne Hummer Investments, trust and asset management customers of CTC and brokerage customers from unaffiliated companies.

Notes_Payable_Federal_Home_Loa

Notes Payable, Federal Home Loan Bank Advances, Other Borrowings and Subordinated Notes	3 Months Ended
	Mar. 31, 2014
Debt Disclosure [Abstract]	'
Notes Payable, Federal Home Loan Bank Advances, Other Borrowings, Secured Borrowings and Subordinated Notes	'
	Notes Payable, Federal Home Loan Bank Advances, Other Borrowings and Subordinated Notes
	The following table is a summary of notes payable, Federal Home Loan Bank advances, other borrowings and subordinated notes as of the dates shown:
	(Dollars in thousands)	31-Mar-14		31-Dec-13		31-Mar-13
	Notes payable	$	182	$	364	$	31,911
	Federal Home Loan Bank advances	387,672		417,762		414,032
	Other borrowings:
	Securities sold under repurchase agreements	211,692		235,347		224,297
	Other	19,212		19,393		31,947
	Total other borrowings	230,904		254,740		256,244
	Subordinated notes	—		—		15,000
	Total notes payable, Federal Home Loan Bank advances, other borrowings and subordinated notes	$	618,758	$	672,866	$	717,187
	At March 31, 2014, the Company had notes payable of $182,000, 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 March 31, 2014, the interest rate was 1.25%. At December 31, 2013 and March 31, 2013, this Unsecured Promissory Note had an outstanding balance of $364,000 and $911,000, respectively.
	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 March 31, 2014, 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 contain 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 March 31, 2014, the Company was in compliance with all such covenants. The revolving 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 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.
	At March 31, 2014, December 31, 2013 and March 31, 2013, securities sold under repurchase agreements represent $31.7 million, $55.3 million and $44.3 million, respectively, of customer sweep accounts in connection with master repurchase agreements at the banks, and $180.0 million of short-term borrowings from brokers. 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 March 31, 2014, the Company had pledged securities related to its customer balances in sweep accounts and short-term borrowings from brokers of $122.1 million and $192.1 million, respectively, which exceed the outstanding borrowings resulting in no net credit exposure. Securities pledged for customer balances in sweep accounts and short-term borrowings from brokers 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 March 31, 2014 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 March 31, 2014, the Fixed-rate Promissory Note had an outstanding balance of $19.2 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 scheduled final installment payment on the notes was December 15, 2013. See Note 16 – Shareholders’ Equity and Earnings Per Share for further discussion of the TEUs.
	At March 31, 2014 and December 31, 2013, the Company had no outstanding subordinated notes. At March 31, 2013, 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. Interest on each note was calculated at a rate equal to three-month LIBOR plus 130 basis points.

Junior_Subordinated_Debentures

Junior Subordinated Debentures

3 Months Ended

Mar. 31, 2014

Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust [Abstract]

'

Junior Subordinated Debentures

'

Junior Subordinated Debentures

As of March 31, 2014, 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 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 March 31, 2014. The junior subordinated debentures represent the par value of the obligations owed to the Trusts.

(Dollars in thousands)

Common

Trust

Junior

Rate

Contractual rate

Issue

Maturity

Earliest

Securities

Preferred

Subordinated

Structure

at 3/31/2014

Date

Date

Redemption

Securities

Debentures

Date

Wintrust Capital Trust III

$

774

$

25,000

$

25,774

L+3.25

3.49

%

Apr-03

Apr-33

Apr-08

Wintrust Statutory Trust IV

619

20,000

20,619

L+2.80

3.03

%

Dec-03

Dec-33

Dec-08

Wintrust Statutory Trust V

1,238

40,000

41,238

L+2.60

2.83

%

May-04

May-34

Jun-09

Wintrust Capital Trust VII

1,550

50,000

51,550

L+1.95

2.18

%

Dec-04

Mar-35

Mar-10

Wintrust Capital Trust VIII

1,238

40,000

41,238

L+1.45

1.68

%

Aug-05

Sep-35

Sep-10

Wintrust Captial Trust IX

1,547

50,000

51,547

L+1.63

1.86

%

Sep-06

Sep-36

Sep-11

Northview Capital Trust I

186

6,000

6,186

L+3.00

3.24

%

Aug-03

Nov-33

Aug-08

Town Bankshares Capital Trust I

186

6,000

6,186

L+3.00

3.24

%

Aug-03

Nov-33

Aug-08

First Northwest Capital Trust I

155

5,000

5,155

L+3.00

3.23

%

May-04

May-34

May-09

Total

$

249,493

2.42

%

The junior subordinated debentures totaled $249.5 million at March 31, 2014, December 31, 2013 and March 31, 2013.

The interest rates on the variable rate junior subordinated debentures are based on the three-month LIBOR rate and reset on a quarterly basis. At March 31, 2014, the weighted average contractual interest rate on the junior subordinated debentures was 2.42%. 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 2013 with an aggregate notional amount of $90 million, replaced two interest rate swaps that matured in September 2013. The hedge-adjusted rate on the junior subordinated debentures as of March 31, 2014, was 3.17%. 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 March 31, 2014, all of the junior subordinated debentures, net of the Common Securities, were included in the Company’s Tier 1 regulatory capital.

Segment_Information

Segment Information	3 Months Ended
	Mar. 31, 2014
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 9 — 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 substantially similar to as those described in “Summary of Significant Accounting Policies” in Note 1 of the Company’s 2013 Form 10-K. 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:
		Three months ended March 31,						$ Change in			% Change  in
	(Dollars in thousands)	2014			2013			Contribution			Contribution
	Net interest income:
	Community Banking	$	116,755		$	106,230		$	10,525		10	%
	Specialty Finance	19,212			17,482			1,730			10
	Wealth Management	4,099			3,447			652			19
	Total Operating Segments	140,066			127,159			12,907			10
	Intersegment Eliminations	3,940			3,554			386			11
	Consolidated net interest income	$	144,006		$	130,713		$	13,293		10	%
	Non-interest income:
	Community Banking	$	27,319		$	40,601		$	(13,282	)	(33	)%
	Specialty Finance	7,881			7,305			576			8
	Wealth Management	16,941			15,442			1,499			10
	Total Operating Segments	52,141			63,348			(11,207		)	(18	)
	Intersegment Eliminations	(6,612		)	(5,969		)	(643		)	(11	)
	Consolidated non-interest income	$	45,529		$	57,379		$	(11,850	)	(21	)%
	Net revenue:
	Community Banking	$	144,074		$	146,831		$	(2,757	)	(2	)%
	Specialty Finance	27,093			24,787			2,306			9
	Wealth Management	21,040			18,889			2,151			11
	Total Operating Segments	192,207			190,507			1,700			1
	Intersegment Eliminations	(2,672		)	(2,415		)	(257		)	(11	)
	Consolidated net revenue	$	189,535		$	188,092		$	1,443		1	%
	Segment profit:
	Community Banking	$	22,581		$	20,979		$	1,602		8	%
	Specialty Finance	8,982			8,629			353			4
	Wealth Management	2,937			2,444			493			20
	Consolidated net income	$	34,500		$	32,052		$	2,448		8	%
	Segment assets:
	Community Banking	$	15,160,507		$	14,295,418		$	865,089		6	%
	Specialty Finance	2,532,362			2,291,140			241,222			11
	Wealth Management	528,294			487,689			40,605			8
	Consolidated total assets	$	18,221,163		$	17,074,247		$	1,146,916		7	%

Derivative_Financial_Instrumen

Derivative Financial Instruments	3 Months Ended
	Mar. 31, 2014
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 and certain deposits. 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 March 31, 2014:
	(Dollars in thousands)
			Notional			Accounting	Fair Value as of
	Effective Date	Maturity Date	Amount			Treatment	31-Mar-14
	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-May-12	3-May-16	215,000			Non-Hedge Designated	391
	1-Jun-12	1-Apr-15	96,530			Non-Hedge Designated	—
	29-Aug-12	29-Aug-16	216,500			Cash Flow Hedging	801
	22-Feb-13	22-Aug-16	56,500			Non-Hedge Designated	246
	22-Feb-13	22-Aug-16	43,500			Cash Flow Hedging	190
	21-Mar-13	21-Mar-17	100,000			Non-Hedge Designated	1,023
	16-May-13	16-Nov-16	75,000			Non-Hedge Designated	482
	15-Sep-13	15-Sep-17	50,000			Cash Flow Hedging	866
	30-Sep-13	30-Sep-17	40,000			Cash Flow Hedging	721
			$	1,030,030			$	4,720
	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) 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 March 31, 2014, December 31, 2013 and March 31, 2013:
		Derivative Assets												Derivative Liabilities
		Fair Value												Fair Value
	(Dollars in thousands)	31-Mar-14				31-Dec-13				31-Mar-13				31-Mar-14				31-Dec-13				31-Mar-13
	Derivatives designated as hedging instruments under ASC 815:
	Interest rate derivatives designated as Cash Flow Hedges	$	2,578			$	1,776			$	1			$	2,892			$	3,160			$	6,556
	Interest rate derivatives designated as Fair Value Hedges	90				107				93				1				1				—
	Total derivatives designated as hedging instruments under ASC 815	$	2,668			$	1,883			$	94			$	2,893			$	3,161			$	6,556
	Derivatives not designated as hedging instruments under ASC 815:
	Interest rate derivatives	$	34,571			$	36,073			$	46,559			$	32,097			$	31,646			$	43,706
	Interest rate lock commitments	13,658				7,500				5,551				115				147				1,315
	Forward commitments to sell mortgage loans	625				2,761				213				2,688				2,310				3,015
	Foreign exchange contracts	7				4				19				4				—				153
	Total derivatives not designated as hedging instruments under ASC 815	$	48,861			$	46,338			$	52,342			$	34,904			$	34,103			$	48,189
	Total derivatives	$	51,529			$	48,221			$	52,436			$	37,797			$	37,264			$	54,745
	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.
	During the first quarter of 2014, the Company designated two existing interest rate cap derivatives as cash flow hedges of variable rate deposits. The cap derivatives had notional amounts of $216.5 million and $43.5 million, respectively, both maturing in August 2016. Additionally, as of March 31, 2014, the Company had two interest rate swaps and four interest rate caps designated as hedges of 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 the three months ended March 31, 2014 or March 31, 2013. The Company uses the hypothetical derivative method to assess and measure effectiveness.
	The table below provides details on each of these cash flow hedges as of March 31, 2014:
		31-Mar-14
	(Dollars in thousands)	Notional				Fair Value
	Maturity Date	Amount				Asset (Liability)
	Interest Rate Swaps:
	Sep-16	50,000				(1,906		)
	Oct-16	25,000				(986		)
	Total Interest Rate Swaps	75,000				(2,892		)
	Interest Rate Caps:
	Sep-14	20,000				—
	Sep-14	40,000				—
	Aug-16	43,500				190
	Aug-16	216,500				801
	Sep-17	50,000				866
	Sep-17	40,000				721
	Total Interest Rate Caps	410,000				2,578
	Total Cash Flow Hedges	$	485,000			$	(314	)
	A rollforward of the amounts in accumulated other comprehensive income related to interest rate derivatives designated as cash flow hedges follows:
		Three months ended March 31,
	(Dollars in thousands)	2014				2013
	Unrealized loss at beginning of period	$	(3,971	)		$	(8,673	)
	Amount reclassified from accumulated other comprehensive income to interest expense on junior subordinated debentures	493				1,539
	Amount of loss recognized in other comprehensive income	(591		)		(65		)
Unrealized loss at end of period	$	(4,069	)		$	(7,199	)
As of March 31, 2014, 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 March 31, 2014, the Company has three interest rate swaps with an aggregate notional amount of $5.8 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 losses of $2,000 and $1,000 in other income related to hedge ineffectiveness for the three months ended March 31, 2014 and 2013, respectively. The Company also recognized net decreases in interest income of $10,000 and $2,000 for the respective three month periods ended March 31, 2014 and 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 three month period ended March 31, 2014 the Company recorded amortization of the basis in the previously hedged item as a reduction to interest income of $43,000.
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 March 31, 2014 and 2013:
(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		Three Months Ended March 31,								Three Months Ended March 31,								Ineffectiveness
																			Three Months Ended
Derivatives in Fair Value																			March 31,
Hedging Relationships			2014				2013				2014				2013				2014				2013
Interest rate products	Other income		$	(17	)		$	(11	)		$	15			$	10			$	(2	)		$	(1	)
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 March 31, 2014, the Company had interest rate derivative transactions with an aggregate notional amount of approximately $2.9 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 April 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 March 31, 2014, the Company had forward commitments to sell mortgage loans with an aggregate notional amount of approximately $445.0 million and interest rate lock commitments with an aggregate notional amount of approximately $306.6 million. Additionally, the Company’s total mortgage loans held-for-sale at March 31, 2014 was $215.2 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 March 31, 2014 the Company held foreign currency derivatives with an aggregate notional amount of approximately $1.8 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 March 31, 2014, December 31, 2013 or March 31, 2013.
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. As of March 31, 2014, the Company held six interest rate cap derivative contracts, which are not designated in hedge relationships, with an aggregate notional value of $620.0 million.
Amounts included in the Consolidated Statements of Income related to derivative instruments not designated in hedge relationships were as follows:
			Three Months Ended
(Dollars in thousands)			March 31,
Derivative	Location in income statement		2014				2013
Interest rate swaps and caps	Other income		$	(677	)		$	(297	)
Mortgage banking derivatives	Mortgage banking revenue		3,677				(670		)
Covered call options	Fees from covered call options		1,542				1,639
Foreign exchange contracts	Other income		(1		)		(146		)
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 March 31, 2014 the fair value of interest rate derivatives in a net liability position, which includes accrued interest related to these agreements, was $26.2 million. If the Company had breached any of these provisions at March 31, 2014 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's 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-Mar-14				31-Dec-13				31-Mar-13				31-Mar-14				31-Dec-13				31-Mar-13
Gross Amounts Recognized	$	37,239			$	37,956			$	46,653			$	34,990			$	34,807			$	50,262
Less: Amounts offset in the Statements of Financial Condition	$	—			$	—			$	—			$	—			$	—			$	—
Net amount presented in the Statements of Financial Condition	$	37,239			$	37,956			$	46,653			$	34,990			$	34,807			$	50,262
Gross amounts not offset in the Statements of Financial Condition
Offsetting Derivative Positions	(7,359		)		(8,826		)		(1,523		)		(7,359		)		(8,826		)		(1,523		)
Securities Collateral Posted (1)	—				—				—				(27,631		)		(25,981		)		(43,361		)
Cash Collateral Posted	—				—				—				—				—				(2,445		)
Net Credit Exposure	$	29,880			$	29,130			$	45,130			$	—			$	—			$	2,933
(1) As of March 31, 2014 and December 31, 2013, the Company posted securities collateral of $37.1 million and $34.6 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_Values_of_Assets_and_Liab

Fair Values of Assets and Liabilities	3 Months Ended
	Mar. 31, 2014
Fair Value Disclosures [Abstract]	'
Fair Values of Assets and Liabilities	'
	Fair Values 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 assumptions 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 March 31, 2014, the Company classified $39.8 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 the first quarter of 2014, 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 March 31, 2014 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 March 31, 2014, the Company held $23.4 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 March 31, 2014, 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 1.44%-2.33% with an average of 1.93% 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, a division of Barrington Bank and Trust Company, N.A. ("Barrington Bank"), 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 March 31, 2014, the Company classified $8.7 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 March 31, 2014 was 9.66% with discount rates applied ranging from 9.5%-13.0%. 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 11.95% used as an input to value the pool of mortgage servicing rights at March 31, 2014. 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 corroborated 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. The Company made an accounting policy election 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:
		March 31, 2014
	(Dollars in thousands)	Total			Level 1			Level 2			Level 3
	Available-for-sale securities
	U.S. Treasury	$	340,178		$	—		$	340,178		$	—
	U.S. Government agencies	828,275			—			828,275			—
	Municipal	175,300			—			135,528			39,772
	Corporate notes	135,067			—			135,067			—
	Mortgage-backed	417,303			—			417,303			—
	Equity securities	53,574			—			30,136			23,438
	Trading account securities	1,068			—			1,068			—
	Mortgage loans held-for-sale	215,231			—			215,231			—
	Mortgage servicing rights	8,719			—			—			8,719
	Nonqualified deferred compensations assets	7,783			—			7,783			—
	Derivative assets	51,529			—			51,529			—
	Total	$	2,234,027		$	—		$	2,162,098		$	71,929
	Derivative liabilities	$	37,797		$	—		$	37,797		$	—
			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-Mar-13
	(Dollars in thousands)	Total			Level 1			Level 2			Level 3
	Available-for-sale securities
	U.S. Treasury	$	217,645		$	—		$	217,645		$	—
	U.S. Government agencies	973,715			—			973,715			—
	Municipal	110,259			—			77,935			32,324
	Corporate notes	148,873			—			148,873			—
	Mortgage-backed	368,282			—			368,282			—
	Equity securities	52,057			—			27,587			24,470
	Trading account securities	1,036			—			1,036			—
	Mortgage loans held-for-sale	370,570			—			370,570			—
	Mortgage servicing rights	7,344			—			—			7,344
	Nonqualified deferred compensations assets	6,545			—			6,545			—
	Derivative assets	52,436			—			52,436			—
	Total	$	2,308,762		$	—		$	2,244,624		$	64,138
	Derivative liabilities	$	54,745		$	—		$	54,745		$	—
The aggregate remaining contractual principal balance outstanding as of March 31, 2014, December 31, 2013 and March 31, 2013 for mortgage loans held-for-sale measured at fair value under ASC 825 was $199.3 million, $314.9 million and $366.8 million, respectively, while the aggregate fair value of mortgage loans held-for-sale was $215.2 million, $332.5 million and $370.6 million, for the same respective periods, 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 March 31, 2014, December 31, 2013 and March 31, 2013.
The changes in Level 3 assets measured at fair value on a recurring basis during the three months ended March 31, 2014 and 2013 are summarized as follows:
				Equity securities			Mortgage
(Dollars in thousands)	Municipal						servicing rights
Balance at January 1, 2014	$	36,386		$	22,163		$	8,946
Total net gains (losses) included in:
Net loss (1)	—			—			(227		)
Other comprehensive income	147			1,275			—
Purchases	3,360			—			—
Issuances	—			—			—
Sales	—			—			—
Settlements	(121		)	—			—
Net transfers into/(out of) Level 3	—			—			—
Balance at March 31, 2014	$	39,772		$	23,438		$	8,719
-1	Changes in the balance of mortgage servicing rights are recorded as a component of mortgage banking revenue in non-interest income.
				Equity securities			Mortgage
(Dollars in thousands)	Municipal						servicing rights
Balance at January 1, 2013	$	30,770		$	22,169		$	6,750
Total net gains (losses) included in:
Net income (1)	—			—			594
Other comprehensive (loss) income	(12		)	2,301			—
Purchases	1,687			—			—
Issuances	—			—			—
Sales	—			—			—
Settlements	(121		)	—			—
Net transfers into/(out of) Level 3	—			—			—
Balance at March 31, 2013	$	32,324		$	24,470		$	7,344
-1	Changes in the balance of mortgage servicing rights are recorded as a component of mortgage banking revenue in non-interest income.
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 impairment charges on 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 March 31, 2014.
	March 31, 2014												Three Months
													Ended March 31, 2014
(Dollars in thousands)	Total			Level 1			Level 2			Level 3			Fair Value Losses Recognized
Impaired loans—collateral based	$	68,355		$	—		$	—		$	68,355		$	7,564
Other real estate owned, including covered other real estate owned (1)	129,279			—			—			129,279			6,172
Total	$	197,634		$	—		$	—		$	197,634		$	13,736
-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 7 – Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans. At March 31, 2014, the Company had $143.0 million of impaired loans classified as Level 3. Of the $143.0 million of impaired loans, $68.4 million were measured at fair value based on the underlying collateral of the loan as shown in the table above. The remaining $74.6 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 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 March 31, 2014, the Company had $129.3 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%-84% of the carrying value prior to impairment adjustments at March 31, 2014, with a weighted average input of 4.65%. An increased impairment adjustment applied to the carrying value results in a decreased valuation.
The valuation techniques and significant unobservable inputs used to measure both recurring and non-recurring Level 3 fair value measurements at March 31, 2014 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	$	39,772		Bond pricing		Equivalent rating	BBB-AA+		N/A	Increase
Other Equity Securities	23,438			Discounted cash flows		Discount rate	1.44%-2.33%		1.93%	Decrease
Mortgage Servicing Rights	8,719			Discounted cash flows		Discount rate	9.5%-13%		9.66%	Decrease
						Constant prepayment rate (CPR)	10%-15%		11.95%	Decrease
Measured at fair value on a non-recurring basis:
Impaired loans—collateral based	$	68,355		Appraisal value		N/A	N/A		N/A	N/A
Other real estate owned, including covered other real estate owned	129,279			Appraisal value		Property specific impairment adjustment	0%-84%		4.65%	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:
	At March 31, 2014						At December 31, 2013						At March 31, 2013
	Carrying			Fair			Carrying			Fair			Carrying		Fair
(Dollars in thousands)	Value			Value			Value			Value			Value		Value
Financial Assets:
Cash and cash equivalents	$	342,738		$	342,738		$	263,864		$	263,864		$	213,201	$	213,201
Interest bearing deposits with banks	540,964			540,964			495,574			495,574			685,302		685,302
Available-for-sale securities	1,949,697			1,949,697			2,176,290			2,176,290			1,870,831		1,870,831
Trading account securities	1,068			1,068			497			497			1,036		1,036
Brokerage customer receivables	26,884			26,884			30,953			30,953			25,614		25,614
Federal Home Loan Bank and Federal Reserve Bank stock, at cost	78,524			78,524			79,261			79,261			76,601		76,601
Mortgage loans held-for-sale, at fair value	215,231			215,231			332,485			332,485			370,570		370,570
Mortgage loans held-for-sale, at lower of cost or market	—			—			1,842			1,857			10,352		10,458
Total loans	13,445,638			14,078,788			13,243,033			13,867,255			12,418,973		13,125,643
Mortgage servicing rights	8,719			8,719			8,946			8,946			7,344		7,344
Nonqualified deferred compensation assets	7,783			7,783			7,222			7,222			6,545		6,545
Derivative assets	51,529			51,529			48,221			48,221			52,436		52,436
FDIC indemnification asset	60,298			60,298			85,672			85,672			170,696		170,696
Accrued interest receivable and other	169,580			169,580			163,732			163,732			156,825		156,825
Total financial assets	$	16,898,653		$	17,531,803		$	16,937,592		$	17,561,829		$	16,066,326	$	16,773,102
Financial Liabilities
Non-maturity deposits	$	10,944,521		$	10,944,521		$	10,442,077		$	10,442,077		$	9,293,104	$	9,293,104
Deposits with stated maturities	4,184,524			4,197,918			4,226,712			4,242,172			4,669,653		4,701,049
Notes payable	182			182			364			364			31,911		31,911
Federal Home Loan Bank advances	387,672			393,145			417,762			422,750			414,032		425,103
Subordinated notes	—			—			—			—			15,000		15,000
Other borrowings	230,904			230,904			254,740			254,740			256,244		256,244
Junior subordinated debentures	249,493			250,578			249,493			250,672			249,493		250,470
Derivative liabilities	37,797			37,797			37,264			37,264			54,745		54,745
Accrued interest payable	7,218			7,218			8,556			8,556			11,520		11,520
Total financial liabilities	$	16,042,311		$	16,062,263		$	15,636,968		$	15,658,595		$	14,995,702	$	15,039,146
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.
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.
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.

StockBased_Compensation_Plans

Stock-Based Compensation Plans	3 Months Ended
	Mar. 31, 2014
Share-based Compensation [Abstract]	'
Stock-Based Compensation Plans	'
	Stock-Based Compensation Plans
	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 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 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 March 31, 2014, assuming all performance-based shares will be issued at the maximum levels, 361,834 shares were available for future grants.
	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.
	Beginning in 2011, the Company has awarded annual grants under The Long-Term Incentive Program (“LTIP”), which is administered under the 2007 Plan. The 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 anticipated that LTIP awards will continue to be granted annually. LTIP grants to date have consisted of time vested nonqualified stock options and performance-based stock and cash awards. Stock options granted under the LTIP have a term of seven years and will generally vest equally over three years based on continued service. Performance-based stock and cash awards granted under the LTIP 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. These performance awards are granted at a target level, and based on the Company’s achievement of the pre-established long-term goals, the actual payouts can range from 0% to 200% of the target award. The awards vest in the quarter after the end of the performance period upon certification of the payout by the Compensation Committee of the Board of Directors. Holders of performance-based stock awards are entitled to shares of common stock at no cost.
	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 share 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. Expected life has been based on historical exercise and termination behavior as well as the term of the option, but the expected life of the options granted pursuant to the LTIP awards has been 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 three month periods ending March 31, 2014 and 2013.
		Three Months Ended		Three Months Ended
		March 31,		March 31,
		2014		2013
	Expected dividend yield	0.4	%	0.5	%
	Expected volatility	30.8	%	59.7	%
	Risk-free rate	0.7	%	0.7	%
	Expected option life (in years)	4.5		4.5
	Stock based compensation is recognized based upon the number of awards that are ultimately expected to vest. Forfeitures are estimated based on historical forfeiture experience. In addition, for performance-based awards, an estimate is made of the number of shares expected to vest as a result of projected performance against the performance criteria in the award to determine the amount of compensation expense to recognize. The estimate is reevaluated periodically and total compensation expense is adjusted for any change in estimate in the current period. Stock-based compensation expense recognized in the Consolidated Statements of Income was $3.8 million in the first quarter of 2014 and $2.3 million in the first quarter of 2013. The first quarter of 2014 includes a $2.1 million charge for a modification to the performance measurement criteria related to the 2011 LTIP performance-based stock grants that were vested and paid out in the first quarter of 2014. The cost of the modification was determined based on the stock price on the date of re-measurement and paid to the holders of the performance-based stock awards in cash. Similarly, in the first quarter of 2014, a modification was made to the performance measurement criteria related to the performance-based cash awards granted under the LTIP in 2011. These awards vested and were paid out in the first quarter of 2014 and the Company recognized an additional charge of $3.0 million related to the modification.
	A summary of the Plans' stock option activity for the three months ended March 31, 2014 and March 31, 2013 is presented below:
	Stock Options	Common			Weighted		Remaining		Intrinsic
		Shares			Average		Contractual		Value (2)
					Strike Price		Term (1)		$0
	Outstanding at January 1, 2014	1,524,672			$	42
	Granted	358,440			46.86
	Exercised	(77,311	)		34.79
	Forfeited or canceled	(18,898	)		45.56
	Outstanding at March 31, 2014	1,786,903			$	43.25	3.7		$	12,834
	Exercisable at March 31, 2014	1,166,309			$	43.96	2.4		$	8,655
	Stock Options	Common			Weighted		Remaining		Intrinsic
		Shares			Average		Contractual		Value (2)
					Strike Price		Term (1)		$0
	Outstanding at January 1, 2013	1,745,427			$	42.31
	Granted	219,695			37.85
	Exercised	(8,336	)		24.98
	Forfeited or canceled	(6,330	)		41.49
	Outstanding at March 31, 2013	1,950,456			$	41.89	3.3		$	3,975
	Exercisable at March 31, 2013	1,437,240			$	44.64	2.3		$	2,318
	-1	Represents the remaining weighted average contractual life in years.
	-2	Aggregate intrinsic value represents the total pre-tax intrinsic value (i.e., the difference between the Company's stock price on the last trading day of the quarter 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 quarter. Options with exercise prices above the stock price on the last trading day of the quarter 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 grant date fair value per share of options granted during the three months ended March 31, 2014 and March 31, 2013 was $11.96 and $17.59, respectively. The aggregate intrinsic value of options exercised during the three months ended March 31, 2014 and 2013, was $911,000 and $102,000, respectively.
	A summary of the Plans' restricted share activity for the three months ended March 31, 2014 and March 31, 2013 is presented below:
		Three months ended March 31, 2014					Three months ended March 31, 2013
	Restricted Shares	Common			Weighted		Common			Weighted
		Shares			Average		Shares			Average
					Grant-Date					Grant-Date
					Fair Value					Fair Value
	Outstanding at January 1	181,522			$	43.39	314,226			$	37.99
	Granted	2,775			46.86		—			—
	Vested and issued	(24,900	)		33.81		(109,725	)		31.67
	Forfeited	(451	)		44.29		(674	)		32.1
	Outstanding at March 31	158,946			$	44.95	203,827			$	41.4
	Vested, but not issuable at March 31	85,000			$	51.88	85,000			$	51.88
	A summary of the 2007 Plan's performance-based stock award activity, based on the target level of the awards, for the three months ended March 31, 2014 and March 31, 2013 is presented below:
		Three months ended March 31, 2014					Three months ended March 31, 2013
	Performance-based Stock	Common			Weighted		Common			Weighted
		Shares			Average		Shares			Average
					Grant-Date					Grant-Date
					Fair Value					Fair Value
	Outstanding at January 1	307,512			$	34.01	214,565			$	32.08
	Granted	91,501			46.86		102,160			37.84
	Vested and issued	(15,944	)		33.25		—			—
	Forfeited	(81,551	)		33.38		(2,359	)		33.02
	Outstanding at March 31	301,518			$	38.12	314,366			$	33.95
	Based on the achievement of the pre-established performance goals over a three-year period, the actual performance-based award payouts can be adjusted downward to 0% or upward to a maximum of 200% of the target award. The awards vest in the quarter after the end of the performance period. In the first quarter of 2014, the 2011 grants vested and were paid.
	The Company issues new shares to satisfy its obligation to issue shares granted pursuant to the Plans.

Shareholders_Equity_and_Earnin

Shareholders' Equity and Earnings Per Share	3 Months Ended
	Mar. 31, 2014
Shareholders' Equity and Earnings Per Share Disclosure [Abstract]	'
Shareholders' Equity and Earnings Per Share	'
	Shareholders’ Equity and Earnings Per Share
	Tangible Equity Units
	In December 2010, the Company sold 4.6 million 7.50% TEUs 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 in full. 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 at the issuance date were as follows:
	(Dollars in thousands, except per unit amounts)	Equity				Debt				TEU Total
		Component				Component
	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 used 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 (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 (the “Series A Preferred Stock”) for $50 million in a private transaction. Dividends on the Series A Preferred Stock were paid 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 the 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 (the “Series C Preferred Stock”) 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 the fourth quarter of 2013, 23 shares of the Series C Preferred Stock were converted at the option of the respective holders into 558 shares of the Company's common stock. 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 Warrant
	Pursuant to the U.S. Department of the Treasury’s (the “U.S. Treasury”) 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 March 31, 2014, the warrant to purchase 1,643,295 shares remains outstanding.
	The Company previously issued other warrants to acquire common stock. These warrants entitled 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 March 31, 2014.
	Other
	In May 2013, the Company issued 648,286 shares of its common stock in the acquisition of FLB.
	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.
	Accumulated Other Comprehensive Income (Loss)
	The following tables summarize the components of other comprehensive income (loss), including the related income tax effects, and the related amount reclassified to net income for the periods presented (in thousands).
		Accumulated				Accumulated				Accumulated			Total
		Unrealized				Unrealized				Foreign			Accumulated
		(Losses) Gains on				Losses on				Currency			Other
		Securities				Derivative				Translation			Comprehensive
						Instruments				Adjustments			Income (Loss)
	Balance at January 1, 2014	$	(53,665	)		$	(2,462	)		$	(6,909	)	$	(63,036	)
	Other comprehensive income (loss) during the period, net of tax, before reclassifications	13,722				(356		)		(7,400		)	5,966
	Amount reclassified from accumulated other comprehensive income (loss), net of tax	20				297				—			317
	Net other comprehensive income (loss) during the period, net of tax	$	13,742			$	(59	)		$	(7,400	)	$	6,283
	Balance at March 31, 2014	$	(39,923	)		$	(2,521	)		$	(14,309	)	$	(56,753	)
	Balance at January 1, 2013	$	6,710			$	(5,292	)		$	6,293		$	7,711
	Other comprehensive income (loss) during the period, net of tax, before reclassifications	(4,649		)		(39		)		(4,866		)	(9,554		)
	Amount reclassified from accumulated other comprehensive income (loss), net of tax	(151		)		927				—			776
	Net other comprehensive income (loss) during the period, net of tax	$	(4,800	)		$	888			$	(4,866	)	$	(8,778	)
	Balance at March 31, 2013	$	1,910			$	(4,404	)		$	1,427		$	(1,067	)
		Amount Reclassified from Accumulated Other Comprehensive Income for the
	Details Regarding the Component of	Three Months Ended March 31,								Impacted Line on the
	Accumulated Other Comprehensive Income	2014				2013				Consolidated Statements of Income
	Accumulated unrealized losses on securities
	Gains included in net income	$	(33	)		$	251			(Losses) gains on available-for-sale securities, net
		(33		)		251				Income before taxes
	Tax effect	$	13			$	(100	)		Income tax expense
	Net of tax	$	(20	)		$	151			Net income
	Accumulated unrealized losses on derivative instruments
	Amount reclassified to interest expense on junior subordinated debentures	$	493			$	1,539			Interest on junior subordinated debentures
		(493		)		(1,539		)		Loss before taxes
	Tax effect	$	196			$	612			Income tax benefit
	Net of tax	$	(297	)		$	(927	)		Net loss
	Earnings per Share
	The following table shows the computation of basic and diluted earnings per share for the periods indicated:
				Three Months Ended March 31,
	(In thousands, except per share data)			2014				2013
Net income			$	34,500			$	32,052
Less: Preferred stock dividends and discount accretion			1,581				2,616
Net income applicable to common shares—Basic	(A)		32,919				29,436
Add: Dividends on convertible preferred stock, if dilutive			1,581				2,581
Net income applicable to common shares—Diluted	(B)		34,500				32,017
Weighted average common shares outstanding	(C)		46,195				36,976
Effect of dilutive potential common shares
Common stock equivalents			1,434				7,443
Convertible preferred stock, if dilutive			3,075				5,020
Total dilutive potential common shares			4,509				12,463
Weighted average common shares and effect of dilutive potential common shares	(D)		50,704				49,439
Net income per common share:
Basic	(A/C)		$	0.71			$	0.8
Diluted	(B/D)		$	0.68			$	0.65
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 Employee Stock Purchase Plan and the Directors Deferred Fee and Stock 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.

Subsequent_Events

Subsequent Events	3 Months Ended
	Mar. 31, 2014
Subsequent Events [Abstract]	'
Subsequent Events	'
	Subsequent Events
	On April 28, 2014, the Company announced the acquisition, through its wholly-owned subsidiary, First Insurance Funding of Canada, Inc., of 100% of the shares of each of Policy Billing Services Inc. and Equity Premium Finance Inc., two affiliated Canadian insurance premium funding and payment services companies.
	On April 8, 2014, the Company announced the signing of a definitive agreement to acquire, through its wholly-owned subsidiary Town Bank, certain branch offices and deposits of Talmer Bank & Trust. Through this transaction, subject to final adjustments, Town Bank will acquire 11 branch offices and deposits of approximately $360 million.
	On April 7, 2014, the Company announced the signing of a definitive agreement to acquire, through its wholly-owned subsidiary Town Bank, the Pewaukee, Wisconsin branch of THE National Bank. Through this transaction, subject to final adjustments, Town Bank will acquire approximately $40 million of deposits, approximately $90 million of performing loans, the bank facility, property and various other assets.

Basis_of_Presentation_Policies

Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2014
Accounting Policies [Abstract]	'
Business Combinations	'
	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, other real estate owned (“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.
	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 7 — 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 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 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.
Acquired Loans with Evidence of Credit Quality Deterioration	'
	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 generally 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 6—Loans, for more information on loans acquired with evidence of credit quality deterioration since origination.
	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.
Cash and Cash Equivalents	'
	For purposes of the Consolidated Statements of Cash Flows, the Company considers cash and cash equivalents to include 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.
Loans	'
	Certain life insurance premium finance receivables attributable to the life insurance premium finance loan acquisition in 2009 as well as purchased credit impaired ("PCI") loans acquired with evidence of credit quality deterioration since origination are recorded net of credit discounts.
Allowance for Loan Losses, Non-performing 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 PCI loans. The remainder of the portfolio is considered performing under the contractual terms of the loan agreement.
Loans and Leases Receivable, Allowance for Loan Losses Policy [Policy Text Block]	'
	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 related to covered loans 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 3 – Business Combinations for more detail.
Allowance for Loan Losses, Troubled Debt Restructurings	'
	The Company’s approach to restructuring loans, excluding PCI loans, 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 PCI loans, 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 PCI loans, 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 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 the 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. 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 March 31, 2014 and approximately $4.0 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.  During the three months ended March 31, 2014 and 2013, the Company recorded $132,000 and $229,000, respectively, in interest income representing this decrease in impairment.
Intangibles Amortizations	'
	The core deposit intangibles recognized in connection with prior bank acquisitions are amortized over a ten-year period 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 while the customer list intangibles recognized in connection with prior acquisitions within the wealth management segment are being amortized over a ten-year period on a straight-line basis.
Notes Payable, Federal Home Loan Bank Advances, Other Borrowings, Secured Borrowings and Subordinated Notes	'
	FHLB advances are stated at par value of the debt adjusted for unamortized fair value adjustments recorded in connection with advances acquired through acquisitions.
	he 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.
Offsetting Assets and Liabilities	'
	The Company records securities sold under repurchase agreements at their gross value and does not offset positions on the Consolidated Statements of Condition.
Repurchase Agreements, Collateral	'
	Securities pledged for customer balances in sweep accounts and short-term borrowings from brokers 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	'
	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.
Derivatives, Policy [Policy Text Block]	'
	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) 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.
Offsetting of Derivative Instruments	'
	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
Fair Value Measurement	'
	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 assumptions 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.
Compensation Related Costs, Policy [Policy Text Block]	'
	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 share 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. Expected life has been based on historical exercise and termination behavior as well as the term of the option, but the expected life of the options granted pursuant to the LTIP awards has been 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.
Tangible Equity Unit	'
	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 in full. 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 at the issuance date were as follows:
	(Dollars in thousands, except per unit amounts)	Equity		Debt		TEU Total
		Component		Component
	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 used 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 (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.
Earnings Per Share	'
	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 Employee Stock Purchase Plan and the Directors Deferred Fee and Stock 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_Tables

Business Combinations (Tables)	3 Months Ended
	Mar. 31, 2014
Business Combinations [Abstract]	'
FDIC Indemnification Asset Roll Forward	'
	The following table summarizes the activity in the Company’s FDIC indemnification asset during the periods indicated:
		Three Months Ended
	(Dollars in thousands)	31-Mar-14			31-Mar-13
	Balance at beginning of period	$	85,672		$	208,160
	Additions from acquisitions	—			—
	Additions from reimbursable expenses	1,282			5,033
	Amortization	(1,603		)	(2,468		)
	Changes in expected reimbursements from the FDIC for changes in expected credit losses	(15,384		)	(26,097		)
	Payments received from the FDIC	(9,669		)	(13,932		)
	Balance at end of period	$	60,298		$	170,696

AvailableForSale_Securities_Ta

Available-For-Sale Securities (Tables)	3 Months Ended
	Mar. 31, 2014
Available-for-sale Securities [Abstract]	'
Schedule Of The Available-For-Sale Securities Reconciliation	'
	The following tables are a summary of the available-for-sale securities portfolio as of the dates shown:
		31-Mar-14
	(Dollars in thousands)	Amortized			Gross			Gross			Fair
		Cost			Unrealized			Unrealized			Value
					Gains			Losses
	U.S. Treasury	$	354,109		$	263		$	(14,194	)	$	340,178
	U.S. Government agencies	874,845			3,286			(49,856		)	828,275
	Municipal	175,028			3,439			(3,167		)	175,300
	Corporate notes:
	Financial issuers	129,413			2,306			(1,735		)	129,984
	Other	4,986			100			(3		)	5,083
	Mortgage-backed: (1)
	Mortgage-backed securities	371,825			3,919			(13,188		)	362,556
	Collateralized mortgage obligations	55,190			356			(799		)	54,747
	Other equity securities	50,570			3,543			(539		)	53,574
	Total available-for-sale securities	$	2,015,966		$	17,212		$	(83,481	)	$	1,949,697
		31-Dec-13
		Amortized			Gross			Gross			Fair
		Cost			Unrealized			Unrealized			Value
	(Dollars in thousands)				Gains			Losses
	U.S. Treasury	$	354,262		$	141		$	(18,308	)	$	336,095
	U.S. Government agencies	950,086			1,680			(56,078		)	895,688
	Municipal	154,463			2,551			(4,298		)	152,716
	Corporate notes:
	Financial issuers	129,362			1,993			(2,411		)	128,944
	Other	5,994			105			(5		)	6,094
	Mortgage-backed: (1)
	Mortgage-backed securities	562,708			3,537			(18,047		)	548,198
	Collateralized mortgage obligations	57,711			258			(942		)	57,027
	Other equity securities	50,532			1,493			(497		)	51,528
	Total available-for-sale securities	$	2,265,118		$	11,758		$	(100,586	)	$	2,176,290
		31-Mar-13
		Amortized			Gross			Gross			Fair
		Cost			Unrealized			Unrealized			Value
	(Dollars in thousands)				Gains			Losses
	U.S. Treasury	$	220,215		$	190		$	(2,760	)	$	217,645
	U.S. Government agencies	975,386			2,960			(4,631		)	973,715
	Municipal	107,947			2,628			(316		)	110,259
	Corporate notes:
	Financial issuers	136,761			2,569			(2,280		)	137,050
	Other	11,628			195			—			11,823
	Mortgage-backed: (1)
	Mortgage-backed securities	294,728			7,360			(3,194		)	298,894
	Collateralized mortgage obligations	68,496			897			(5		)	69,388
	Other equity securities	52,413			745			(1,101		)	52,057
	Total available-for-sale securities	$	1,867,574		$	17,544		$	(14,287	)	$	1,870,831
	-1	Consisting entirely of residential mortgage-backed securities, none of which are subprime.
Available-For-Sale Securities, Continuous Unrealized Loss Position, Fair Value	'
	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 March 31, 2014:
		Continuous unrealized						Continuous unrealized						Total
		losses existing for						losses existing for
		less than 12 months						greater than 12 months
	(Dollars in thousands)	Fair Value			Unrealized Losses			Fair Value			Unrealized Losses			Fair Value		Unrealized Losses
	U.S. Treasury	$	—		$	—		$	185,969		$	(14,194	)	$	185,969	$	(14,194	)
	U.S. Government agencies	463,254			(42,295		)	54,128			(7,561		)	517,382		(49,856		)
	Municipal	61,280			(2,683		)	9,484			(484		)	70,764		(3,167		)
	Corporate notes:
	Financial issuers	1,327			(10		)	57,474			(1,725		)	58,801		(1,735		)
	Other	997			(3		)	—			—			997		(3		)
	Mortgage-backed:
	Mortgage-backed securities	137,042			(1,352		)	137,661			(11,836		)	274,703		(13,188		)
	Collateralized mortgage obligations	21,045			(275		)	11,944			(524		)	32,989		(799		)
	Other equity securities	8,296			(213		)	5,674			(326		)	13,970		(539		)
	Total	$	693,241		$	(46,831	)	$	462,334		$	(36,650	)	$	1,155,575	$	(83,481	)
Schedule Of Realized Gain (Loss)	'
	The following table provides information as to the amount of gross gains and gross losses realized and proceeds received through the sales of available-for-sale investment securities:
		Three months ended March 31,
	(Dollars in thousands)	2014			2013
	Realized gains	$	55		$	313
	Realized losses	(88		)	(62		)
	Net realized (losses) gains	$	(33	)	$	251
	Other than temporary impairment charges	—			—
	(Losses) gains on available-for-sale securities, net	$	(33	)	$	251
	Proceeds from sales of available-for-sale securities	$	14,800		$	41,056
Investments Classified by Contractual Maturity Date	'
	The amortized cost and fair value of securities as of March 31, 2014, December 31, 2013 and March 31, 2013, 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:
		31-Mar-14						31-Dec-13						31-Mar-13
	(Dollars in thousands)	Amortized Cost			Fair Value			Amortized Cost			Fair Value			Amortized Cost		Fair Value
	Due in one year or less	$	203,749		$	203,942		$	268,847		$	269,168		$	247,388	$	247,836
	Due in one to five years	338,130			338,980			358,108			358,357			337,431		338,633
	Due in five to ten years	344,296			330,546			350,372			330,020			357,677		356,871
	Due after ten years	652,206			605,352			616,840			561,992			509,441		507,152
	Mortgage-backed	427,015			417,303			620,419			605,225			363,224		368,282
	Other equity securities	50,570			53,574			50,532			51,528			52,413		52,057
	Total available-for-sale securities	$	2,015,966		$	1,949,697		$	2,265,118		$	2,176,290		$	1,867,574	$	1,870,831

Loans_Tables

Loans (Tables)	3 Months Ended
	Mar. 31, 2014
Loans and Leases Receivable Disclosure [Abstract]	'
Summary Of Loan Portfolio	'
	The following table shows the Company’s loan portfolio by category as of the dates shown:
		March 31,			December 31,			March 31,
	(Dollars in thousands)	2014			2013			2013
	Balance:
	Commercial	$	3,439,197		$	3,253,687		$	2,872,695
	Commercial real-estate	4,262,255			4,230,035			3,990,465
	Home equity	707,748			719,137			759,218
	Residential real-estate	426,769			434,992			360,652
	Premium finance receivables—commercial	2,208,361			2,167,565			1,997,160
	Premium finance receivables—life insurance	1,929,334			1,923,698			1,753,512
	Consumer and other	159,496			167,488			166,610
	Total loans, net of unearned income, excluding covered loans	$	13,133,160		$	12,896,602		$	11,900,312
	Covered loans	312,478			346,431			518,661
	Total loans	$	13,445,638		$	13,243,033		$	12,418,973
	Mix:
	Commercial	26		%	25		%	23		%
	Commercial real-estate	32			32			32
	Home equity	5			5			6
	Residential real-estate	3			3			3
	Premium finance receivables—commercial	17			16			16
	Premium finance receivables—life insurance	14			15			14
	Consumer and other	1			1			2
	Total loans, net of unearned income, excluding covered loans	98		%	97		%	96		%
	Covered loans	2			3			4
	Total loans	100		%	100		%	100		%
Schedule Of Unpaid Principal Balance And Carrying Value Of Acquired Loans Table [Text Block]	'
	The following table presents the unpaid principal balance and carrying value for these acquired loans:
		31-Mar-14						31-Dec-13
		Unpaid			Carrying			Unpaid			Carrying
		Principal						Principal
	(Dollars in thousands)	Balance			Value			Balance			Value
	Bank acquisitions	$	407,157		$	303,362		$	453,944		$	338,517
	Life insurance premium finance loans acquisition	424,680			413,202			437,155			423,906
Activity Related To Accretable Yield Of Loans Acquired With Evidence Of Credit Quality Deterioratio 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:
		Three Months Ended						Three Months Ended
		31-Mar-14						31-Mar-13
	(Dollars in thousands)	Bank Acquisitions			Life Insurance			Bank			Life Insurance
					Premium Finance Loans			Acquisitions			Premium
											Finance Loans
	Accretable yield, beginning balance	$	107,655		$	8,254		$	143,224		$	13,055
	Acquisitions	—			—			(78		)	—
	Accretable yield amortized to interest income	(7,770		)	(1,771		)	(9,577		)	(2,019		)
	Accretable yield amortized to indemnification asset (1)	(5,648		)	—			(8,706		)	—
	Reclassification from non-accretable difference (2)	8,580			—			5,412			—
	(Decreases) increases in interest cash flows due to payments and changes in interest rates	(5,143		)	78			(8,550		)	182
	Accretable yield, ending balance (3)	$	97,674		$	6,561		$	121,725		$	11,218
	-1	Represents the portion of the current period accreted yield, resulting from lower expected losses, applied to reduce the loss share indemnification asset.
	-2	Reclassification is the result of subsequent increases in expected principal cash flows.
	-3	As of March 31, 2014, the Company estimates that the remaining accretable yield balance to be amortized to the indemnification asset for the bank acquisitions is $28.1 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 Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans (Tables)	3 Months Ended
	Mar. 31, 2014
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 March 31, 2014, December 31, 2013 and March 31, 2013:
	As of March 31, 2014					90+ days and still accruing				60-89 days past due				30-59 days past due
	(Dollars in thousands)	Nonaccrual																Current				Total Loans
	Loan Balances:
	Commercial
	Commercial and industrial	$	11,112			$	387			$	2,235			$	16,150			$	1,965,425			$	1,995,309
	Franchise	—				—				—				75				221,026				221,101
	Mortgage warehouse lines of credit	—				—				—				—				60,809				60,809
	Community Advantage—homeowners association	—				—				—				—				91,414				91,414
	Aircraft	—				—				—				—				8,840				8,840
	Asset-based lending	670				—				—				10,573				729,425				740,668
	Tax exempt	—				—				—				—				177,973				177,973
	Leases	—				—				—				—				121,986				121,986
	Other	—				—				—				—				10,261				10,261
	PCI - commercial (1)	—				1,079				—				865				8,892				10,836
	Total commercial	11,782				1,466				2,235				27,663				3,396,051				3,439,197
	Commercial real-estate:
	Residential construction	—				—				680				27				35,690				36,397
	Commercial construction	844				—				—				—				150,786				151,630
	Land	2,405				—				2,682				3,438				99,445				107,970
	Office	6,970				—				1,672				8,868				633,655				651,165
	Industrial	6,101				—				1,114				2,706				615,139				625,060
	Retail	9,540				—				217				3,089				664,584				677,430
	Multi-family	1,327				—				—				3,820				570,616				575,763
	Mixed use and other	6,546				—				6,626				10,744				1,337,320				1,361,236
	PCI - commercial real-estate (1)	—				21,073				2,791				6,169				45,571				75,604
	Total commercial real-estate	33,733				21,073				15,782				38,861				4,152,806				4,262,255
	Home equity	7,311				—				1,650				4,972				693,815				707,748
	Residential real estate	14,385				—				946				4,889				403,474				423,694
	PCI - residential real estate (1)	—				1,414				—				248				1,413				3,075
	Premium finance receivables
	Commercial insurance loans	14,517				6,808				5,600				20,777				2,160,659				2,208,361
	Life insurance loans	—				—				—				4,312				1,511,820				1,516,132
	PCI - life insurance loans (1)	—				—				—				—				413,202				413,202
	Consumer and other	1,144				57				213				550				157,290				159,254
	PCI - consumer and other (1)	—				48				—				20				174				242
	Total loans, net of unearned income, excluding covered loans	$	82,872			$	30,866			$	26,426			$	102,292			$	12,890,704			$	13,133,160
	Covered loans	9,136				35,831				6,682				7,042				253,787				312,478
	Total loans, net of unearned income	$	92,008			$	66,697			$	33,108			$	109,334			$	13,144,491			$	13,445,638
	-1	PCI 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.
	As of December 31, 2013					90+ days and still accruing				60-89 days past due				30-59 days past due
	(Dollars in thousands)	Nonaccrual																Current				Total Loans
	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
	PCI - commercial (1)	—				274				156				1,685				9,068				11,183
	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
PCI - 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
PCI - 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
PCI - life insurance loans (1)	—				—				—				—				423,906				423,906
Consumer and other	1,137				105				76				1,010				163,956				166,284
PCI - 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	PCI 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.
As of March 31, 2013					90+ days and still accruing				60-89 days past due				30-59 days past due
(Dollars in thousands)	Nonaccrual																Current				Total Loans
Loan Balances:
Commercial
Commercial and industrial	$	17,717			$	—			$	1,150			$	16,710			$	1,533,999			$	1,569,576
Franchise	125				—				—				76				194,310				194,511
Mortgage warehouse lines of credit	—				—				—				—				131,970				131,970
Community Advantage—homeowners association	—				—				—				—				82,763				82,763
Aircraft	—				—				—				—				14,112				14,112
Asset-based lending	531				—				483				5,518				680,723				687,255
Tax exempt	—				—				—				—				89,508				89,508
Leases	—				—				—				844				97,186				98,030
Other	—				—				—				—				127				127
PCI - commercial (1)	—				449				—				—				4,394				4,843
Total commercial	18,373				449				1,633				23,148				2,829,092				2,872,695
Commercial real-estate:
Residential construction	3,094				—				945				—				33,044				37,083
Commercial construction	1,086				—				9,521				—				151,751				162,358
Land	17,976				—				—				11,563				104,039				133,578
Office	3,564				—				8,990				4,797				567,333				584,684
Industrial	7,137				—				—				986				587,402				595,525
Retail	7,915				—				6,970				5,953				565,963				586,801
Multi-family	2,088				—				1,036				4,315				505,346				512,785
Mixed use and other	18,947				—				1,573				13,560				1,288,754				1,322,834
PCI - commercial real-estate (1)	—				1,866				251				3,333				49,367				54,817
Total commercial real-estate	61,807				1,866				29,286				44,507				3,852,999				3,990,465
Home equity	14,891				—				1,370				4,324				738,633				759,218
Residential real estate	9,606				—				782				8,680				340,751				359,819
PCI - residential real estate (1)	—				—				198				—				635				833
Premium finance receivables
Commercial insurance loans	12,068				7,677				4,647				19,323				1,953,445				1,997,160
Life insurance loans	20				2,256				—				1,340				1,250,165				1,253,781
PCI - life insurance loans (1)	—				—				—				—				499,731				499,731
Consumer and other	1,790				145				287				714				161,036				163,972
PCI - consumer and other (1)	—				—				—				20				2,618				2,638
Total loans, net of unearned income, excluding covered loans	$	118,555			$	12,393			$	38,203			$	102,056			$	11,629,105			$	11,900,312
Covered loans	1,820				115,482				1,454				12,268				387,637				518,661
Total loans, net of unearned income	$	120,375			$	127,875			$	39,657			$	114,324			$	12,016,742			$	12,418,973
-1	PCI 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.
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 March 31, 2014, December 31, 2013 and March 31, 2013:
		Performing												Non-performing											Total
	(Dollars in thousands)	March 31,				31-Dec-13				March 31,				31-Mar-14				31-Dec-13				31-Mar-13			March 31,			31-Dec-13		March 31,
		2014								2013															2014					2013
	Loan Balances:
	Commercial
	Commercial and industrial	$	1,983,810			$	1,826,063			$	1,551,859			$	11,499			$	10,143			$	17,717		$	1,995,309		$	1,836,206	$	1,569,576
	Franchise	221,101				220,383				194,386				—				—				125			221,101			220,383		194,511
	Mortgage warehouse lines of credit	60,809				67,470				131,970				—				—				—			60,809			67,470		131,970
	Community Advantage—homeowners association	91,414				90,894				82,763				—				—				—			91,414			90,894		82,763
	Aircraft	8,840				10,241				14,112				—				—				—			8,840			10,241		14,112
	Asset-based lending	739,998				734,456				686,724				670				637				531			740,668			735,093		687,255
	Tax exempt	177,973				161,239				89,508				—				—				—			177,973			161,239		89,508
	Leases	121,986				109,831				98,030				—				—				—			121,986			109,831		98,030
	Other	10,261				11,147				127				—				—				—			10,261			11,147		127
	PCI - commercial (1)	10,836				11,183				4,843				—				—				—			10,836			11,183		4,843
	Total commercial	3,427,028				3,242,907				2,854,322				12,169				10,780				18,373			3,439,197			3,253,687		2,872,695
	Commercial real-estate
	Residential construction	36,397				38,351				33,989				—				149				3,094			36,397			38,500		37,083
	Commercial construction	150,786				129,737				161,272				844				6,969				1,086			151,630			136,706		162,358
	Land	105,565				103,971				115,602				2,405				2,814				17,976			107,970			106,785		133,578
	Office	644,195				632,154				581,120				6,970				10,087				3,564			651,165			642,241		584,684
	Industrial	618,959				628,284				588,388				6,101				5,654				7,137			625,060			633,938		595,525
	Retail	667,890				645,397				578,886				9,540				10,862				7,915			677,430			656,259		586,801
	Multi-family	574,436				564,502				510,697				1,327				2,035				2,088			575,763			566,537		512,785
	Mixed use and other	1,354,690				1,364,136				1,303,887				6,546				8,318				18,947			1,361,236			1,372,454		1,322,834
	PCI - commercial real-estate(1)	75,604				76,615				54,817				—				—				—			75,604			76,615		54,817
	Total commercial real-estate	4,228,522				4,183,147				3,928,658				33,733				46,888				61,807			4,262,255			4,230,035		3,990,465
	Home equity	700,437				709,066				744,327				7,311				10,071				14,891			707,748			719,137		759,218
	Residential real-estate	409,309				417,151				350,213				14,385				14,974				9,606			423,694			432,125		359,819
	PCI - residential real-estate (1)	3,075				2,867				833				—				—				—			3,075			2,867		833
	Premium finance receivables
	Commercial insurance loans	2,187,036				2,148,186				1,977,415				21,325				19,379				19,745			2,208,361			2,167,565		1,997,160
	Life insurance loans	1,516,132				1,499,792				1,251,505				—				—				2,276			1,516,132			1,499,792		1,253,781
	PCI - life insurance loans (1)	413,202				423,906				499,731				—				—				—			413,202			423,906		499,731
	Consumer and other	158,053				165,042				162,037				1,201				1,242				1,935			159,254			166,284		163,972
	PCI - consumer and other(1)	242				1,204				2,638				—				—				—			242			1,204		2,638
	Total loans, net of unearned income, excluding covered loans	$	13,043,036			$	12,793,268			$	11,771,679			$	90,124			$	103,334			$	128,633		$	13,133,160		$	12,896,602	$	11,900,312
	-1	PCI loans represent loans acquired with evidence of credit quality deterioration since origination, in accordance with ASC 310-30. See Note 6 - Loans for further discussion of these purchased loans.
Summary Of Activity In The Allowance For Credit Losses By Loan Portfolio	'
	A summary of activity in the allowance for credit losses by loan portfolio (excluding covered loans) for the three ended March 31, 2014 and 2013 is as follows:
	Three months ended March 31, 2014					Commercial Real-estate								Residential Real-estate				Premium Finance Receivable				Consumer and Other			Total, Excluding Covered Loans
	(Dollars in thousands)	Commercial								Home Equity
	Allowance for credit losses
	Allowance for loan losses at beginning of period	$	23,092			$	48,658			$	12,611			$	5,108			$	5,583			$	1,870		$	96,922
	Other adjustments	(15		)		(121		)		(1		)		(2		)		(9		)		—			(148		)
	Reclassification from (to) allowance for unfunded lending-related commitments	—				(18		)		—				—				—				—			(18		)
	Charge-offs	(648		)		(4,493		)		(2,267		)		(226		)		(1,210		)		(173		)	(9,017		)
	Recoveries	317				145				257				131				321				61			1,232
	Provision for credit losses	1,943				434				366				(320		)		897				(16		)	3,304
	Allowance for loan losses at period end	$	24,689			$	44,605			$	10,966			$	4,691			$	5,582			$	1,742		$	92,275
	Allowance for unfunded lending-related commitments at period end	$	—			$	737			$	—			$	—			$	—			$	—		$	737
	Allowance for credit losses at period end	$	24,689			$	45,342			$	10,966			$	4,691			$	5,582			$	1,742		$	93,012
	Individually evaluated for impairment	3,107				4,041				596				455				—				95			8,294
	Collectively evaluated for impairment	21,512				41,301				10,370				4,147				5,582				1,647			84,559
	Loans acquired with deteriorated credit quality	70				—				—				89				—				—			159
	Loans at period end
	Individually evaluated for impairment	$	18,350			$	99,480			$	7,537			$	18,026			$	—			$	1,592		$	144,985
	Collectively evaluated for impairment	3,410,011				4,087,171				700,211				405,668				3,724,493				157,662			12,485,216
	Loans acquired with deteriorated credit quality	10,836				75,604				—				3,075				413,202				242			502,959
	Three months ended March 31, 2013					Commercial Real-estate								Residential Real-estate				Premium Finance Receivable				Consumer and Other			Total, Excluding Covered Loans
	(Dollars in thousands)	Commercial								Home Equity
	Allowance for credit losses
	Allowance for loan losses at beginning of period	$	28,794			$	52,135			$	12,734			$	5,560			$	6,096			$	2,032		$	107,351
	Other adjustments	(3		)		(217		)		—				(9		)		—				—			(229		)
	Reclassification from (to) allowance for unfunded lending-related commitments	—				(213		)		—				—				—				—			(213		)
	Charge-offs	(4,540		)		(3,299		)		(2,397		)		(1,728		)		(1,068		)		(129		)	(13,161		)
	Recoveries	295				368				162				5				294				109			1,233
	Provision for credit losses	4,406				7,634				1,623				1,312				749				(357		)	15,367
	Allowance for loan losses at period end	$	28,952			$	56,408			$	12,122			$	5,140			$	6,071			$	1,655		$	110,348
	Allowance for unfunded lending-related commitments at period end	$	—			$	15,287			$	—			$	—			$	—			$	—		$	15,287
	Allowance for credit losses at period end	$	28,952			$	71,695			$	12,122			$	5,140			$	6,071			$	1,655		$	125,635
	Individually evaluated for impairment	3,682				23,089				1,748				598				—				156			29,273
	Collectively evaluated for impairment	25,270				48,409				10,374				4,532				6,071				1,499			96,155
	Loans acquired with deteriorated credit quality	—				197				—				10				—				—			207
	Loans at period end
	Individually evaluated for impairment	$	27,447			$	145,203			$	16,057			$	12,984			$	—			$	1,863		$	203,554
	Collectively evaluated for impairment	2,840,405				3,790,445				743,161				346,835				3,250,941				162,109			11,133,896
	Loans acquired with deteriorated credit quality	4,843				54,817				—				833				499,731				2,638			562,862
Summary Of Activity In The Allowance For Covered Loan Losses	'
	A summary of activity in the allowance for covered loan losses for the three months ended March 31, 2014 and 2013 is as follows:
		Three Months Ended
		March 31,				March 31,
	(Dollars in thousands)	2014				2013
	Balance at beginning of period	$	10,092			$	13,454
	Provision for covered loan losses before benefit attributable to FDIC loss share agreements	(7,121		)		1,600
	Benefit attributable to FDIC loss share agreements	5,697				(1,280		)
	Net provision for covered loan losses	(1,424		)		320
	(Decrease) increase in FDIC indemnification asset	(5,697		)		1,280
	Loans charged-off	(2,864		)		(2,791		)
	Recoveries of loans charged-off	3,340				9
	Net recoveries (charge-offs)	476				(2,782		)
	Balance at end of period	$	3,447			$	12,272
Summary Of Impaired Loans, Including Restructured Loans	'
	A summary of impaired loans, including troubled debt restructurings ("TDRs"), is as follows:
		March 31,				December 31,				March 31,
	(Dollars in thousands)	2014				2013				2013
	Impaired loans (included in non-performing and TDRs):
	Impaired loans with an allowance for loan loss required (1)	$	86,381			$	92,184			$	101,565
	Impaired loans with no allowance for loan loss required	56,596				70,045				101,989
	Total impaired loans (2)	$	142,977			$	162,229			$	203,554
	Allowance for loan losses related to impaired loans	$	8,197			$	8,265			$	14,607
	TDRs	$	92,517			$	107,103			$	116,345
	-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 for the periods ended as follows:
														For the Three Months Ended
		As of March 31, 2014												31-Mar-14
		Recorded Investment				Unpaid Principal Balance				Related Allowance				Average Recorded Investment				Interest Income Recognized
	(Dollars in thousands)
	Impaired loans with a related ASC 310 allowance recorded
	Commercial
	Commercial and industrial	$	9,167			$	10,029			$	2,459			$	9,340			$	120
	Franchise	—				—				—				—				—
	Mortgage warehouse lines of credit	—				—				—				—				—
	Community Advantage—homeowners association	—				—				—				—				—
	Aircraft	—				—				—				—				—
	Asset-based lending	670				2,465				620				677				31
	Tax exempt	—				—				—				—				—
	Leases	—				—				—				—				—
	Other	—				—				—				—				—
	Commercial real-estate
	Residential construction	—				—				—				—				—
	Commercial construction	3,099				3,099				24				3,099				28
	Land	9,260				9,625				174				9,688				79
	Office	8,712				9,398				1,069				8,767				90
	Industrial	6,597				6,765				513				5,985				81
	Retail	12,763				12,903				826				12,819				132
	Multi-family	2,053				2,143				122				2,057				23
	Mixed use and other	25,420				25,591				1,272				25,853				291
	Home equity	2,109				2,534				596				2,117				24
	Residential real-estate	6,222				6,362				427				6,094				68
	Premium finance receivables
	Commercial insurance	—				—				—				—				—
	Life insurance	—				—				—				—				—
	PCI - life insurance	—				—				—				—				—
	Consumer and other	309				367				95				290				5
	Impaired loans with no related ASC 310 allowance recorded
	Commercial
	Commercial and industrial	$	7,789			$	14,415			$	—			$	8,179			$	208
	Franchise	—				—				—				—				—
	Mortgage warehouse lines of credit	—				—				—				—				—
	Community Advantage—homeowners association	—				—				—				—				—
	Aircraft	—				—				—				—				—
	Asset-based lending	—				—				—				—				—
	Tax exempt	—				—				—				—				—
	Leases	—				—				—				—				—
	Other	—				—				—				—				—
	Commercial real-estate
	Residential construction	891				891				—				1,245				12
	Commercial construction	1,466				1,471				—				1,418				17
	Land	4,982				8,764				—				4,985				109
	Office	6,260				6,301				—				6,266				83
	Industrial	2,298				2,470				—				2,314				47
	Retail	10,419				12,273				—				11,006				140
	Multi-family	1,078				2,013				—				1,201				23
	Mixed use and other	3,161				5,044				—				3,096				67
	Home equity	5,428				7,044				—				5,777				73
	Residential real-estate	11,541				14,427				—				11,699				137
	Premium finance receivables
	Commercial insurance	—				—				—				—				—
	Life insurance	—				—				—				—				—
	PCI - life insurance	—				—				—				—				—
	Consumer and other	1,283				1,809				—				1,285				27
	Total loans, net of unearned income, excluding covered loans	$	142,977			$	168,203			$	8,197			$	145,257			$	1,915
														For the Twelve Months Ended
		As of December 31, 2013												31-Dec-13
		Recorded Investment				Unpaid Principal Balance				Related Allowance				Average Recorded Investment				Interest Income Recognized
(Dollars in thousands)
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	—				—				—				—				—
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	—				—				—				—				—
Consumer and other	1,322				1,865				—				1,355				115
Total loans, net of unearned income, excluding covered loans	$	162,229			$	195,455			$	8,265			$	170,658			$	8,920
													For the Three Months Ended
	As of March 31, 2013												31-Mar-13
	Recorded Investment				Unpaid Principal Balance				Related Allowance				Average Recorded Investment				Interest Income Recognized
(Dollars in thousands)
Impaired loans with a related ASC 310 allowance recorded
Commercial
Commercial and industrial	$	12,827			$	14,544			$	3,627			$	13,034			$	230
Franchise	—				—				—				—				—
Mortgage warehouse lines of credit	—				—				—				—				—
Community Advantage—homeowners association	—				—				—				—				—
Aircraft	—				—				—				—				—
Asset-based lending	511				511				55				511				7
Tax exempt	—				—				—				—				—
Leases	—				—				—				—				—
Other	—				—				—				—				—
Commercial real-estate
Residential construction	1,881				2,007				405				1,976				23
Commercial construction	8,682				8,682				49				8,983				86
Land	17,851				19,070				2,380				17,861				104
Office	5,792				5,996				659				5,853				61
Industrial	4,229				4,286				1,241				4,244				65
Retail	16,734				17,316				674				16,773				194
Multi-family	3,966				4,063				152				4,044				42
Mixed use and other	18,910				20,337				2,863				19,317				232
Home equity	5,160				5,751				1,748				5,488				57
Residential real-estate	4,357				4,974				598				4,365				49
Premium finance receivables
Commercial insurance	—				—				—				—				—
Life insurance	—				—				—				—				—
Purchased life insurance	—				—				—				—				—
Consumer and other	665				665				156				665				8
Impaired loans with no related ASC 310 allowance recorded
Commercial
Commercial and industrial	$	13,963			$	17,153			$	—			$	14,344			$	226
Franchise	125				1,544				—				1,189				26
Mortgage warehouse lines of credit	—				—				—				—				—
Community Advantage—homeowners association	—				—				—				—				—
Aircraft	—				—				—				—				—
Asset-based lending	21				1,358				—				23				18
Tax exempt	—				—				—				—				—
Leases	—				—				—				—				—
Other	—				—				—				—				—
Commercial real-estate
Residential construction	3,208				3,579				—				3,708				42
Commercial construction	3,970				4,450				—				4,016				49
Land	11,305				16,304				—				12,048				203
Office	8,283				8,357				—				8,306				95
Industrial	5,541				5,653				—				5,563				74
Retail	14,483				15,095				—				14,628				172
Multi-family	2,200				4,541				—				2,618				54
Mixed use and other	18,168				19,483				—				18,345				269
Home equity	10,897				13,179				—				11,395				131
Residential real-estate	8,627				9,053				—				8,703				94
Premium finance receivables
Commercial insurance	—				—				—				—				—
Life insurance	—				—				—				—				—
Purchased life insurance	—				—				—				—				—
Consumer and other	1,198				1,664				—				1,208				25
Total loans, net of unearned income, excluding covered loans	$	203,554			$	229,615			$	14,607			$	209,208			$	2,636
Summary Of The Post-Modificatiopn Balance Of Loans Restructured	'
	The tables below present a summary of the post-modification balance of loans restructured during the three months ended March 31, 2014 and 2013, respectively, which represent TDRs:
	Three months ended		Total (1)(2)							Extension at							Reduction of Interest							Modification to					Forgiveness of Debt(2)
	31-Mar-14									Below Market							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		1			$	88			1			$	88			—			$	—			1		$	88		—	$	—
	Commercial real-estate
	Land		—			—				—			—				—			—				—		—			—	—
	Industrial		1			1,078				1			1,078				—			—				1		1,078			—	—
	Retail		1			202				1			202				—			—				—		—			—	—
	Multi-family		—			—				—			—				—			—				—		—			—	—
	Mixed use and other		3			3,877				2			2,604				3			3,877				1		1,273			—	—
	Residential real estate and other		—			—				—			—				—			—				—		—			—	—
	Total loans		6			$	5,245			5			$	3,972			3			$	3,877			3		$	2,439		—	$	—
	Three months ended		Total (1)(2)							Extension at							Reduction of Interest							Modification to					Forgiveness of Debt(2)
	31-Mar-13									Below Market							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
	Land		2			287				2			287				2			287				—		—			1	73
	Industrial		—			—				—			—				—			—				—		—			—	—
	Retail		1			200				1			200				1			200				—		—			—	—
	Multi-family		1			705				1			705				1			705				—		—			—	—
	Mixed use and other		—			—				—			—				—			—				—		—			—	—
	Residential real estate and other		4			377				2			70				3			361				1		123			—	—
	Total loans		14			$	2,277			11			$	1,835			11			$	2,106			3		$	308		1	$	73
	-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.
Summary Of Loans Restuctured And Subsequently Defaulted Under The Restructured Terms	'
	The following table presents a summary of all loans restructured in TDRs during the twelve months ended March 31, 2014 and 2013, and such loans which were in payment default under the restructured terms during the respective periods below:
	(Dollars in thousands)	Three Months Ended														Three Months Ended
		31-Mar-14														31-Mar-13
		Total (1)(3)							Payments in Default  (2)(3)							Total (1)(3)							Payments in Default  (2)(3)
		Count			Balance				Count			Balance				Count			Balance				Count		Balance
	Commercial
	Commercial and industrial	1			$	88			—			$	—			21			$	14,901			6		$	10,377
	Commercial real-estate
	Residential construction	—			—				—			—				3			2,147				—		—
	Commercial construction	3			6,120				3			6,120				—			—				—		—
	Land	1			2,352				—			—				5			4,131				1		651
	Office	4			4,021				3			3,465				—			—				—		—
	Industrial	2			2,027				—			—				1			727				—		—
	Retail	1			202				—			—				4			5,085				—		—
	Multi-family	—			—				—			—				2			1,085				1		705
	Mixed use and other	9			8,919				2			399				12			6,061				4		2,603
	Residential real estate and other	6			1,919				—			—				10			969				2		221
	Total loans	27			$	25,648			8			$	9,984			58			$	35,106			14		$	14,557
	-1	Total TDRs represent all loans restructured in TDRs during the previous twelve months from the date 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.

Goodwill_and_Other_Intangible_1

Goodwill and Other Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2014
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			March 31,
		2014			Acquired			Loss						2014
	Community banking	$	305,313		$	—		$	—		$	—		$	305,313
	Specialty finance	37,370			—			—			(822		)	36,548
	Wealth management	31,864			—			—			—			31,864
	Total	$	374,547		$	—		$	—		$	(822	)	$	373,725
Summary Of Finite-Lived Intangible Assets	'
	A summary of finite-lived intangible assets as of the dates shown and the expected amortization as of March 31, 2014 is as follows:
	(Dollars in thousands)	March 31,			31-Dec-13			March 31,
		2014						2013
	Community banking segment:
	Core deposit intangibles:
	Gross carrying amount	$	40,770		$	40,770		$	37,860
	Accumulated amortization	(30,209		)	(29,189		)	(26,127		)
	Net carrying amount	$	10,561		$	11,581		$	11,733
	Specialty finance segment:
	Customer list intangibles:
	Gross carrying amount	$	1,800		$	1,800		$	1,800
	Accumulated amortization	(842		)	(805		)	(688		)
	Net carrying amount	$	958		$	995		$	1,112
	Wealth management segment:
	Customer list and other intangibles:
	Gross carrying amount	$	7,690		$	7,690		$	7,390
	Accumulated amortization	(1,159		)	(1,053		)	(725		)
	Net carrying amount	$	6,531		$	6,637		$	6,665
	Total other intangible assets, net	$	18,050		$	19,213		$	19,510
Estimated Amortization	'
	Estimated amortization
	Actual in three months ended March 31, 2014	$	1,163
	Estimated remaining in 2014	3,207
	Estimated—2015	2,791
	Estimated—2016	2,180
	Estimated—2017	1,764
	Estimated—2018	1,544

Deposits_Tables

Deposits (Tables)	3 Months Ended
	Mar. 31, 2014
Deposits [Abstract]	'
Summary Of Deposits	'
	The following table is a summary of deposits as of the dates shown:
	(Dollars in thousands)	March 31, 2014			December 31, 2013			March 31, 2013
	Balance:
	Non-interest bearing	$	2,773,922		$	2,721,771		$	2,243,440
	NOW	1,983,251			1,953,882			2,043,227
	Wealth management deposits	1,289,134			1,013,850			868,119
	Money market	3,454,271			3,359,999			2,879,636
	Savings	1,443,943			1,392,575			1,258,682
	Time certificates of deposit	4,184,524			4,226,712			4,669,653
	Total deposits	$	15,129,045		$	14,668,789		$	13,962,757
	Mix:
	Non-interest bearing	18		%	19		%	16		%
	NOW	13			13			15
	Wealth management deposits	8			7			6
	Money market	23			23			21
	Savings	10			9			9
	Time certificates of deposit	28			29			33
	Total deposits	100		%	100		%	100		%

Notes_Payable_Federal_Home_Loa1

Notes Payable, Federal Home Loan Bank Advances, Other Borrowings and Subordinated Notes (Tables)	3 Months Ended
	Mar. 31, 2014
Debt Disclosure [Abstract]	'
Summary Of Notes Payable, Federal Home Loan Bank Advances, Other Borrowings, Secured Borrowings And Subordinated Notes	'
	The following table is a summary of notes payable, Federal Home Loan Bank advances, other borrowings and subordinated notes as of the dates shown:
	(Dollars in thousands)	31-Mar-14		31-Dec-13		31-Mar-13
	Notes payable	$	182	$	364	$	31,911
	Federal Home Loan Bank advances	387,672		417,762		414,032
	Other borrowings:
	Securities sold under repurchase agreements	211,692		235,347		224,297
	Other	19,212		19,393		31,947
	Total other borrowings	230,904		254,740		256,244
	Subordinated notes	—		—		15,000
	Total notes payable, Federal Home Loan Bank advances, other borrowings and subordinated notes	$	618,758	$	672,866	$	717,187

Junior_Subordinated_Debentures1

Junior Subordinated Debentures (Tables)	3 Months Ended
	Mar. 31, 2014
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 March 31, 2014. The junior subordinated debentures represent the par value of the obligations owed to the Trusts.
	(Dollars in thousands)	Common		Trust		Junior		Rate	Contractual rate		Issue	Maturity	Earliest
		Securities		Preferred		Subordinated		Structure	at 3/31/2014		Date	Date	Redemption
				Securities		Debentures							Date
	Wintrust Capital Trust III	$	774	$	25,000	$	25,774	L+3.25	3.49	%	Apr-03	Apr-33	Apr-08
	Wintrust Statutory Trust IV	619		20,000		20,619		L+2.80	3.03	%	Dec-03	Dec-33	Dec-08
	Wintrust Statutory Trust V	1,238		40,000		41,238		L+2.60	2.83	%	May-04	May-34	Jun-09
	Wintrust Capital Trust VII	1,550		50,000		51,550		L+1.95	2.18	%	Dec-04	Mar-35	Mar-10
	Wintrust Capital Trust VIII	1,238		40,000		41,238		L+1.45	1.68	%	Aug-05	Sep-35	Sep-10
	Wintrust Captial Trust IX	1,547		50,000		51,547		L+1.63	1.86	%	Sep-06	Sep-36	Sep-11
	Northview Capital Trust I	186		6,000		6,186		L+3.00	3.24	%	Aug-03	Nov-33	Aug-08
	Town Bankshares Capital Trust I	186		6,000		6,186		L+3.00	3.24	%	Aug-03	Nov-33	Aug-08
	First Northwest Capital Trust I	155		5,000		5,155		L+3.00	3.23	%	May-04	May-34	May-09
	Total					$	249,493		2.42	%

Segment_Information_Tables

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2014
Segment Reporting [Abstract]	'
Segment Information	'
	The following is a summary of certain operating information for reportable segments:
		Three months ended March 31,						$ Change in			% Change  in
	(Dollars in thousands)	2014			2013			Contribution			Contribution
	Net interest income:
	Community Banking	$	116,755		$	106,230		$	10,525		10	%
	Specialty Finance	19,212			17,482			1,730			10
	Wealth Management	4,099			3,447			652			19
	Total Operating Segments	140,066			127,159			12,907			10
	Intersegment Eliminations	3,940			3,554			386			11
	Consolidated net interest income	$	144,006		$	130,713		$	13,293		10	%
	Non-interest income:
	Community Banking	$	27,319		$	40,601		$	(13,282	)	(33	)%
	Specialty Finance	7,881			7,305			576			8
	Wealth Management	16,941			15,442			1,499			10
	Total Operating Segments	52,141			63,348			(11,207		)	(18	)
	Intersegment Eliminations	(6,612		)	(5,969		)	(643		)	(11	)
	Consolidated non-interest income	$	45,529		$	57,379		$	(11,850	)	(21	)%
	Net revenue:
	Community Banking	$	144,074		$	146,831		$	(2,757	)	(2	)%
	Specialty Finance	27,093			24,787			2,306			9
	Wealth Management	21,040			18,889			2,151			11
	Total Operating Segments	192,207			190,507			1,700			1
	Intersegment Eliminations	(2,672		)	(2,415		)	(257		)	(11	)
	Consolidated net revenue	$	189,535		$	188,092		$	1,443		1	%
	Segment profit:
	Community Banking	$	22,581		$	20,979		$	1,602		8	%
	Specialty Finance	8,982			8,629			353			4
	Wealth Management	2,937			2,444			493			20
	Consolidated net income	$	34,500		$	32,052		$	2,448		8	%
	Segment assets:
	Community Banking	$	15,160,507		$	14,295,418		$	865,089		6	%
	Specialty Finance	2,532,362			2,291,140			241,222			11
	Wealth Management	528,294			487,689			40,605			8
	Consolidated total assets	$	18,221,163		$	17,074,247		$	1,146,916		7	%

Derivative_Financial_Instrumen1

Derivative Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Interest Rate Cap Derivative Summary [Table Text Block]	'
	Below is a summary of the interest rate cap derivatives held by the Company as of March 31, 2014:
	(Dollars in thousands)
			Notional			Accounting	Fair Value as of
	Effective Date	Maturity Date	Amount			Treatment	31-Mar-14
	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-May-12	3-May-16	215,000			Non-Hedge Designated	391
	1-Jun-12	1-Apr-15	96,530			Non-Hedge Designated	—
	29-Aug-12	29-Aug-16	216,500			Cash Flow Hedging	801
	22-Feb-13	22-Aug-16	56,500			Non-Hedge Designated	246
	22-Feb-13	22-Aug-16	43,500			Cash Flow Hedging	190
	21-Mar-13	21-Mar-17	100,000			Non-Hedge Designated	1,023
	16-May-13	16-Nov-16	75,000			Non-Hedge Designated	482
	15-Sep-13	15-Sep-17	50,000			Cash Flow Hedging	866
	30-Sep-13	30-Sep-17	40,000			Cash Flow Hedging	721
			$	1,030,030			$	4,720
Schedule Of Fair Value Of Derivative Financial Instruments	'
	The table below presents the fair value of the Company’s derivative financial instruments as of March 31, 2014, December 31, 2013 and March 31, 2013:
		Derivative Assets												Derivative Liabilities
		Fair Value												Fair Value
	(Dollars in thousands)	31-Mar-14				31-Dec-13				31-Mar-13				31-Mar-14				31-Dec-13				31-Mar-13
	Derivatives designated as hedging instruments under ASC 815:
	Interest rate derivatives designated as Cash Flow Hedges	$	2,578			$	1,776			$	1			$	2,892			$	3,160			$	6,556
	Interest rate derivatives designated as Fair Value Hedges	90				107				93				1				1				—
	Total derivatives designated as hedging instruments under ASC 815	$	2,668			$	1,883			$	94			$	2,893			$	3,161			$	6,556
	Derivatives not designated as hedging instruments under ASC 815:
	Interest rate derivatives	$	34,571			$	36,073			$	46,559			$	32,097			$	31,646			$	43,706
	Interest rate lock commitments	13,658				7,500				5,551				115				147				1,315
	Forward commitments to sell mortgage loans	625				2,761				213				2,688				2,310				3,015
	Foreign exchange contracts	7				4				19				4				—				153
	Total derivatives not designated as hedging instruments under ASC 815	$	48,861			$	46,338			$	52,342			$	34,904			$	34,103			$	48,189
	Total derivatives	$	51,529			$	48,221			$	52,436			$	37,797			$	37,264			$	54,745
Schedule Of Cash Flow Hedging Instruments	'
	The table below provides details on each of these cash flow hedges as of March 31, 2014:
		31-Mar-14
	(Dollars in thousands)	Notional				Fair Value
	Maturity Date	Amount				Asset (Liability)
	Interest Rate Swaps:
	Sep-16	50,000				(1,906		)
	Oct-16	25,000				(986		)
	Total Interest Rate Swaps	75,000				(2,892		)
	Interest Rate Caps:
	Sep-14	20,000				—
	Sep-14	40,000				—
	Aug-16	43,500				190
	Aug-16	216,500				801
	Sep-17	50,000				866
	Sep-17	40,000				721
	Total Interest Rate Caps	410,000				2,578
	Total Cash Flow Hedges	$	485,000			$	(314	)
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:
		Three months ended March 31,
	(Dollars in thousands)	2014				2013
	Unrealized loss at beginning of period	$	(3,971	)		$	(8,673	)
	Amount reclassified from accumulated other comprehensive income to interest expense on junior subordinated debentures	493				1,539
	Amount of loss recognized in other comprehensive income	(591		)		(65		)
	Unrealized loss at end of period	$	(4,069	)		$	(7,199	)
Derivatives Used To Hedge Changes In Fair Value Attributable To Interest Rate Risk	'
	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 March 31, 2014 and 2013:
	(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		Three Months Ended March 31,								Three Months Ended March 31,								Ineffectiveness
																				Three Months Ended
	Derivatives in Fair Value																			March 31,
	Hedging Relationships			2014				2013				2014				2013				2014				2013
	Interest rate products	Other income		$	(17	)		$	(11	)		$	15			$	10			$	(2	)		$	(1	)
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:
				Three Months Ended
	(Dollars in thousands)			March 31,
	Derivative	Location in income statement		2014				2013
	Interest rate swaps and caps	Other income		$	(677	)		$	(297	)
	Mortgage banking derivatives	Mortgage banking revenue		3,677				(670		)
	Covered call options	Fees from covered call options		1,542				1,639
	Foreign exchange contracts	Other income		(1		)		(146		)
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-Mar-14				31-Dec-13				31-Mar-13				31-Mar-14				31-Dec-13				31-Mar-13
	Gross Amounts Recognized	$	37,239			$	37,956			$	46,653			$	34,990			$	34,807			$	50,262
	Less: Amounts offset in the Statements of Financial Condition	$	—			$	—			$	—			$	—			$	—			$	—
	Net amount presented in the Statements of Financial Condition	$	37,239			$	37,956			$	46,653			$	34,990			$	34,807			$	50,262
	Gross amounts not offset in the Statements of Financial Condition
	Offsetting Derivative Positions	(7,359		)		(8,826		)		(1,523		)		(7,359		)		(8,826		)		(1,523		)
	Securities Collateral Posted (1)	—				—				—				(27,631		)		(25,981		)		(43,361		)
	Cash Collateral Posted	—				—				—				—				—				(2,445		)
	Net Credit Exposure	$	29,880			$	29,130			$	45,130			$	—			$	—			$	2,933
	(1) As of March 31, 2014 and December 31, 2013, the Company posted securities collateral of $37.1 million and $34.6 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_Values_of_Assets_and_Liab1

Fair Values of Assets and Liabilities (Tables)	3 Months Ended
	Mar. 31, 2014
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:
		March 31, 2014
	(Dollars in thousands)	Total			Level 1			Level 2			Level 3
	Available-for-sale securities
	U.S. Treasury	$	340,178		$	—		$	340,178		$	—
	U.S. Government agencies	828,275			—			828,275			—
	Municipal	175,300			—			135,528			39,772
	Corporate notes	135,067			—			135,067			—
	Mortgage-backed	417,303			—			417,303			—
	Equity securities	53,574			—			30,136			23,438
	Trading account securities	1,068			—			1,068			—
	Mortgage loans held-for-sale	215,231			—			215,231			—
	Mortgage servicing rights	8,719			—			—			8,719
	Nonqualified deferred compensations assets	7,783			—			7,783			—
	Derivative assets	51,529			—			51,529			—
	Total	$	2,234,027		$	—		$	2,162,098		$	71,929
	Derivative liabilities	$	37,797		$	—		$	37,797		$	—
			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-Mar-13
	(Dollars in thousands)	Total			Level 1			Level 2			Level 3
	Available-for-sale securities
	U.S. Treasury	$	217,645		$	—		$	217,645		$	—
	U.S. Government agencies	973,715			—			973,715			—
	Municipal	110,259			—			77,935			32,324
	Corporate notes	148,873			—			148,873			—
	Mortgage-backed	368,282			—			368,282			—
	Equity securities	52,057			—			27,587			24,470
	Trading account securities	1,036			—			1,036			—
	Mortgage loans held-for-sale	370,570			—			370,570			—
	Mortgage servicing rights	7,344			—			—			7,344
	Nonqualified deferred compensations assets	6,545			—			6,545			—
	Derivative assets	52,436			—			52,436			—
	Total	$	2,308,762		$	—		$	2,244,624		$	64,138
	Derivative liabilities	$	54,745		$	—		$	54,745		$	—
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 three months ended March 31, 2014 and 2013 are summarized as follows:
					Equity securities			Mortgage
	(Dollars in thousands)	Municipal						servicing rights
	Balance at January 1, 2014	$	36,386		$	22,163		$	8,946
	Total net gains (losses) included in:
	Net loss (1)	—			—			(227		)
	Other comprehensive income	147			1,275			—
	Purchases	3,360			—			—
	Issuances	—			—			—
	Sales	—			—			—
	Settlements	(121		)	—			—
	Net transfers into/(out of) Level 3	—			—			—
	Balance at March 31, 2014	$	39,772		$	23,438		$	8,719
	-1	Changes in the balance of mortgage servicing rights are recorded as a component of mortgage banking revenue in non-interest income.
					Equity securities			Mortgage
	(Dollars in thousands)	Municipal						servicing rights
	Balance at January 1, 2013	$	30,770		$	22,169		$	6,750
	Total net gains (losses) included in:
	Net income (1)	—			—			594
	Other comprehensive (loss) income	(12		)	2,301			—
	Purchases	1,687			—			—
	Issuances	—			—			—
	Sales	—			—			—
	Settlements	(121		)	—			—
	Net transfers into/(out of) Level 3	—			—			—
	Balance at March 31, 2013	$	32,324		$	24,470		$	7,344
	-1	Changes in the balance of mortgage servicing rights are recorded as a component of mortgage banking revenue in non-interest income.
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 March 31, 2014.
		March 31, 2014												Three Months
														Ended March 31, 2014
	(Dollars in thousands)	Total			Level 1			Level 2			Level 3			Fair Value Losses Recognized
	Impaired loans—collateral based	$	68,355		$	—		$	—		$	68,355		$	7,564
	Other real estate owned, including covered other real estate owned (1)	129,279			—			—			129,279			6,172
	Total	$	197,634		$	—		$	—		$	197,634		$	13,736
	-1	Fair value losses recognized on other real estate owned include valuation adjustments and charge-offs during the respective period.
Schedule Of Valuation Techniques And Significant Unobservable Inputs Used To Measure Both Recurring And Non-Recurring	'
	The valuation techniques and significant unobservable inputs used to measure both recurring and non-recurring Level 3 fair value measurements at March 31, 2014 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	$	39,772		Bond pricing		Equivalent rating	BBB-AA+		N/A	Increase
	Other Equity Securities	23,438			Discounted cash flows		Discount rate	1.44%-2.33%		1.93%	Decrease
	Mortgage Servicing Rights	8,719			Discounted cash flows		Discount rate	9.5%-13%		9.66%	Decrease
							Constant prepayment rate (CPR)	10%-15%		11.95%	Decrease
	Measured at fair value on a non-recurring basis:
	Impaired loans—collateral based	$	68,355		Appraisal value		N/A	N/A		N/A	N/A
	Other real estate owned, including covered other real estate owned	129,279			Appraisal value		Property specific impairment adjustment	0%-84%		4.65%	Decrease
Summary Of Carrying Amounts And Estimated Fair Values Of Financial Instruments	'
	The carrying amounts and estimated fair values of the Company’s financial instruments as of the dates shown:
		At March 31, 2014						At December 31, 2013						At March 31, 2013
		Carrying			Fair			Carrying			Fair			Carrying		Fair
	(Dollars in thousands)	Value			Value			Value			Value			Value		Value
	Financial Assets:
	Cash and cash equivalents	$	342,738		$	342,738		$	263,864		$	263,864		$	213,201	$	213,201
	Interest bearing deposits with banks	540,964			540,964			495,574			495,574			685,302		685,302
	Available-for-sale securities	1,949,697			1,949,697			2,176,290			2,176,290			1,870,831		1,870,831
	Trading account securities	1,068			1,068			497			497			1,036		1,036
	Brokerage customer receivables	26,884			26,884			30,953			30,953			25,614		25,614
	Federal Home Loan Bank and Federal Reserve Bank stock, at cost	78,524			78,524			79,261			79,261			76,601		76,601
	Mortgage loans held-for-sale, at fair value	215,231			215,231			332,485			332,485			370,570		370,570
	Mortgage loans held-for-sale, at lower of cost or market	—			—			1,842			1,857			10,352		10,458
	Total loans	13,445,638			14,078,788			13,243,033			13,867,255			12,418,973		13,125,643
	Mortgage servicing rights	8,719			8,719			8,946			8,946			7,344		7,344
	Nonqualified deferred compensation assets	7,783			7,783			7,222			7,222			6,545		6,545
	Derivative assets	51,529			51,529			48,221			48,221			52,436		52,436
	FDIC indemnification asset	60,298			60,298			85,672			85,672			170,696		170,696
	Accrued interest receivable and other	169,580			169,580			163,732			163,732			156,825		156,825
	Total financial assets	$	16,898,653		$	17,531,803		$	16,937,592		$	17,561,829		$	16,066,326	$	16,773,102
	Financial Liabilities
	Non-maturity deposits	$	10,944,521		$	10,944,521		$	10,442,077		$	10,442,077		$	9,293,104	$	9,293,104
	Deposits with stated maturities	4,184,524			4,197,918			4,226,712			4,242,172			4,669,653		4,701,049
	Notes payable	182			182			364			364			31,911		31,911
	Federal Home Loan Bank advances	387,672			393,145			417,762			422,750			414,032		425,103
	Subordinated notes	—			—			—			—			15,000		15,000
	Other borrowings	230,904			230,904			254,740			254,740			256,244		256,244
	Junior subordinated debentures	249,493			250,578			249,493			250,672			249,493		250,470
	Derivative liabilities	37,797			37,797			37,264			37,264			54,745		54,745
	Accrued interest payable	7,218			7,218			8,556			8,556			11,520		11,520
	Total financial liabilities	$	16,042,311		$	16,062,263		$	15,636,968		$	15,658,595		$	14,995,702	$	15,039,146

StockBased_Compensation_Plans_

Stock-Based Compensation Plans (Tables)	3 Months Ended
	Mar. 31, 2014
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 three month periods ending March 31, 2014 and 2013.
		Three Months Ended		Three Months Ended
		March 31,		March 31,
		2014		2013
	Expected dividend yield	0.4	%	0.5	%
	Expected volatility	30.8	%	59.7	%
	Risk-free rate	0.7	%	0.7	%
	Expected option life (in years)	4.5		4.5
Summary Of Stock Option Activity	'
	A summary of the Plans' stock option activity for the three months ended March 31, 2014 and March 31, 2013 is presented below:
	Stock Options	Common			Weighted		Remaining		Intrinsic
		Shares			Average		Contractual		Value (2)
					Strike Price		Term (1)		$0
	Outstanding at January 1, 2014	1,524,672			$	42
	Granted	358,440			46.86
	Exercised	(77,311	)		34.79
	Forfeited or canceled	(18,898	)		45.56
	Outstanding at March 31, 2014	1,786,903			$	43.25	3.7		$	12,834
	Exercisable at March 31, 2014	1,166,309			$	43.96	2.4		$	8,655
	Stock Options	Common			Weighted		Remaining		Intrinsic
		Shares			Average		Contractual		Value (2)
					Strike Price		Term (1)		$0
	Outstanding at January 1, 2013	1,745,427			$	42.31
	Granted	219,695			37.85
	Exercised	(8,336	)		24.98
	Forfeited or canceled	(6,330	)		41.49
	Outstanding at March 31, 2013	1,950,456			$	41.89	3.3		$	3,975
	Exercisable at March 31, 2013	1,437,240			$	44.64	2.3		$	2,318
Summary Of Plans' Restricted Share And Performance-Vested Stock Award Activity	'
	A summary of the Plans' restricted share activity for the three months ended March 31, 2014 and March 31, 2013 is presented below:
		Three months ended March 31, 2014					Three months ended March 31, 2013
	Restricted Shares	Common			Weighted		Common			Weighted
		Shares			Average		Shares			Average
					Grant-Date					Grant-Date
					Fair Value					Fair Value
	Outstanding at January 1	181,522			$	43.39	314,226			$	37.99
	Granted	2,775			46.86		—			—
	Vested and issued	(24,900	)		33.81		(109,725	)		31.67
	Forfeited	(451	)		44.29		(674	)		32.1
	Outstanding at March 31	158,946			$	44.95	203,827			$	41.4
	Vested, but not issuable at March 31	85,000			$	51.88	85,000			$	51.88
	A summary of the 2007 Plan's performance-based stock award activity, based on the target level of the awards, for the three months ended March 31, 2014 and March 31, 2013 is presented below:
		Three months ended March 31, 2014					Three months ended March 31, 2013
	Performance-based Stock	Common			Weighted		Common			Weighted
		Shares			Average		Shares			Average
					Grant-Date					Grant-Date
					Fair Value					Fair Value
	Outstanding at January 1	307,512			$	34.01	214,565			$	32.08
	Granted	91,501			46.86		102,160			37.84
	Vested and issued	(15,944	)		33.25		—			—
	Forfeited	(81,551	)		33.38		(2,359	)		33.02
	Outstanding at March 31	301,518			$	38.12	314,366			$	33.95

Shareholders_Equity_and_Earnin1

Shareholders' Equity and Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2014
Shareholders' Equity and Earnings Per Share Disclosure [Abstract]	'
Aggregate Fair Values Assigned To Each Component Of Tangible Equity Units Offering	'
	The aggregate fair values assigned to each component of the TEU offering at the issuance date were as follows:
	(Dollars in thousands, except per unit amounts)	Equity				Debt				TEU Total
		Component				Component
	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)	'
	The following tables summarize the components of other comprehensive income (loss), including the related income tax effects, and the related amount reclassified to net income for the periods presented (in thousands).
		Accumulated				Accumulated				Accumulated			Total
		Unrealized				Unrealized				Foreign			Accumulated
		(Losses) Gains on				Losses on				Currency			Other
		Securities				Derivative				Translation			Comprehensive
						Instruments				Adjustments			Income (Loss)
	Balance at January 1, 2014	$	(53,665	)		$	(2,462	)		$	(6,909	)	$	(63,036	)
	Other comprehensive income (loss) during the period, net of tax, before reclassifications	13,722				(356		)		(7,400		)	5,966
	Amount reclassified from accumulated other comprehensive income (loss), net of tax	20				297				—			317
	Net other comprehensive income (loss) during the period, net of tax	$	13,742			$	(59	)		$	(7,400	)	$	6,283
	Balance at March 31, 2014	$	(39,923	)		$	(2,521	)		$	(14,309	)	$	(56,753	)
	Balance at January 1, 2013	$	6,710			$	(5,292	)		$	6,293		$	7,711
	Other comprehensive income (loss) during the period, net of tax, before reclassifications	(4,649		)		(39		)		(4,866		)	(9,554		)
	Amount reclassified from accumulated other comprehensive income (loss), net of tax	(151		)		927				—			776
	Net other comprehensive income (loss) during the period, net of tax	$	(4,800	)		$	888			$	(4,866	)	$	(8,778	)
	Balance at March 31, 2013	$	1,910			$	(4,404	)		$	1,427		$	(1,067	)
Other Comprehensive Income Reclassified from AOCI [Table Text Block]	'
		Amount Reclassified from Accumulated Other Comprehensive Income for the
	Details Regarding the Component of	Three Months Ended March 31,								Impacted Line on the
	Accumulated Other Comprehensive Income	2014				2013				Consolidated Statements of Income
	Accumulated unrealized losses on securities
	Gains included in net income	$	(33	)		$	251			(Losses) gains on available-for-sale securities, net
		(33		)		251				Income before taxes
	Tax effect	$	13			$	(100	)		Income tax expense
	Net of tax	$	(20	)		$	151			Net income
	Accumulated unrealized losses on derivative instruments
	Amount reclassified to interest expense on junior subordinated debentures	$	493			$	1,539			Interest on junior subordinated debentures
		(493		)		(1,539		)		Loss before taxes
	Tax effect	$	196			$	612			Income tax benefit
	Net of tax	$	(297	)		$	(927	)		Net loss
Computation Of Basic And Diluted Earnings Per Common Share	'
	The following table shows the computation of basic and diluted earnings per share for the periods indicated:
				Three Months Ended March 31,
	(In thousands, except per share data)			2014				2013
	Net income			$	34,500			$	32,052
	Less: Preferred stock dividends and discount accretion			1,581				2,616
	Net income applicable to common shares—Basic	(A)		32,919				29,436
	Add: Dividends on convertible preferred stock, if dilutive			1,581				2,581
	Net income applicable to common shares—Diluted	(B)		34,500				32,017
	Weighted average common shares outstanding	(C)		46,195				36,976
	Effect of dilutive potential common shares
	Common stock equivalents			1,434				7,443
	Convertible preferred stock, if dilutive			3,075				5,020
	Total dilutive potential common shares			4,509				12,463
	Weighted average common shares and effect of dilutive potential common shares	(D)		50,704				49,439
	Net income per common share:
	Basic	(A/C)		$	0.71			$	0.8
	Diluted	(B/D)		$	0.68			$	0.65

Business_Combinations_Summary_

Business Combinations (Summary Of FDIC Indemnification Asset) (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
FDIC Indemnification Asset [Roll Forward]	'	'
Balance at beginning of period	$85,672	$208,160
Additions from acquisitions	0	0
Additions from reimbursable expenses	1,282	5,033
Amortization	-1,603	-2,468
Changes in expected reimbursements from the FDIC for changes in expected credit losses	-15,384	-26,097
Payments received from the FDIC	9,669	13,932
Balance at end of period	$60,298	$170,696

Business_Combinations_Narrativ

Business Combinations (Narrative) (Detail) (USD $)	3 Months Ended	51 Months Ended	0 Months Ended			12 Months Ended
	Mar. 31, 2014	Mar. 31, 2014	Oct. 18, 2013	1-May-13	Oct. 02, 2013	Sep. 30, 2013	1-May-13	1-May-13	Feb. 01, 2013
		financial_institution	Diamond Bancorp, Inc [Member]	First Lansing Bancorp, Inc. [Member]	Surety Financial Services [Member]	Surety Financial Services [Member]	Southwest Suburbs of Chicago, Illinois [Member]	Northwest Indiana [Member]	Second Federal [Member]
			locations			locations	First Lansing Bancorp, Inc. [Member]	First Lansing Bancorp, Inc. [Member]
							locations	locations
Business Acquisition [Line Items]	'	'	'	'	'	'	'	'	'
Effective date of acquisition	'	'	18-Oct-13	1-May-13	1-Oct-13	'	'	'	'
Number of locations	'	'	4	'	'	5	7	1	'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	'	'	$172,500,000	$373,400,000	'	'	'	'	'
Business acquisition, loans acquired	'	'	91,700,000	123,000,000	'	'	'	'	'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	'	'	169,100,000	334,700,000	'	'	'	'	'
Assumed deposits	'	'	140,200,000	331,400,000	'	'	'	'	'
Additional goodwill recorded on acquisition	0	'	8,400,000	14,000,000	9,500,000	'	'	'	'
Number of FDIC assisted banks acquired	'	9	'	'	'	'	'	'	'
FDIC loss sharing percentage on purchased loans, OREO, and certain other assets	80.00%	'	'	'	'	'	'	'	'
Divestiture of businesses, deposits disposed	'	'	'	'	'	'	'	'	149,000,000
Mortgage Loan Originations	'	'	'	'	'	$1,000,000,000	'	'	'

AvailableForSale_Securities_Sc

Available-For-Sale Securities (Schedule Of Available-For-Sale Securities Reconciliation) (Detail) (USD $)	Mar. 31, 2014		Dec. 31, 2013		Mar. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'		'		'
Amortized cost	$2,015,966		$2,265,118		$1,867,574
Gross unrealized gains	17,212		11,758		17,544
Gross unrealized losses	-83,481		-100,586		-14,287
Available-for-sale securities, at fair value	1,949,697		2,176,290		1,870,831
US Treasury [Member]	'		'		'
Schedule of Available-for-sale Securities [Line Items]	'		'		'
Amortized cost	354,109		354,262		220,215
Gross unrealized gains	263		141		190
Gross unrealized losses	-14,194		-18,308		-2,760
Available-for-sale securities, at fair value	340,178		336,095		217,645
U.S. Government Agencies [Member]	'		'		'
Schedule of Available-for-sale Securities [Line Items]	'		'		'
Amortized cost	874,845		950,086		975,386
Gross unrealized gains	3,286		1,680		2,960
Gross unrealized losses	-49,856		-56,078		-4,631
Available-for-sale securities, at fair value	828,275		895,688		973,715
Municipal [Member]	'		'		'
Schedule of Available-for-sale Securities [Line Items]	'		'		'
Amortized cost	175,028		154,463		107,947
Gross unrealized gains	3,439		2,551		2,628
Gross unrealized losses	-3,167		-4,298		-316
Available-for-sale securities, at fair value	175,300		152,716		110,259
Corporate Notes, Financial Issuers [Member]	'		'		'
Schedule of Available-for-sale Securities [Line Items]	'		'		'
Amortized cost	129,413		129,362		136,761
Gross unrealized gains	2,306		1,993		2,569
Gross unrealized losses	-1,735		-2,411		-2,280
Available-for-sale securities, at fair value	129,984		128,944		137,050
Corporate Notes, Other [Member]	'		'		'
Schedule of Available-for-sale Securities [Line Items]	'		'		'
Amortized cost	4,986		5,994		11,628
Gross unrealized gains	100		105		195
Gross unrealized losses	-3		-5		0
Available-for-sale securities, at fair value	5,083		6,094		11,823
Mortgage-Backed Securities [Member]	'		'		'
Schedule of Available-for-sale Securities [Line Items]	'		'		'
Amortized cost	371,825	[1]	562,708	[1]	294,728	[1]
Gross unrealized gains	3,919	[1]	3,537	[1]	7,360	[1]
Gross unrealized losses	-13,188	[1]	-18,047	[1]	-3,194	[1]
Available-for-sale securities, at fair value	362,556	[1]	548,198	[1]	298,894	[1]
Mortgage-Backed, Collateralized Mortgage Obligations [Member]	'		'		'
Schedule of Available-for-sale Securities [Line Items]	'		'		'
Amortized cost	55,190	[1]	57,711	[1]	68,496	[1]
Gross unrealized gains	356	[1]	258	[1]	897	[1]
Gross unrealized losses	-799	[1]	-942	[1]	-5	[1]
Available-for-sale securities, at fair value	54,747	[1]	57,027	[1]	69,388	[1]
Other Equity Securities [Member]	'		'		'
Schedule of Available-for-sale Securities [Line Items]	'		'		'
Amortized cost	50,570		50,532		52,413
Gross unrealized gains	3,543		1,493		745
Gross unrealized losses	-539		-497		-1,101
Available-for-sale securities, at fair value	$53,574		$51,528		$52,057
[1]	Consisting entirely of residential mortgage-backed securities, none of which are subprime.

AvailableForSale_Securities_Av

Available-For-Sale Securities (Available-For-Sale Securities, Continuous Unrealized Loss Position, Fair Value) (Detail) (USD $)	Mar. 31, 2014
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'
Continuous unrealized losses existing for less than 12 months, Fair value	$693,241
Continuous unrealized losses existing for less than 12 months, Unrealized losses	-46,831
Continuous unrealized losses existing for greater than 12 months, Fair value	462,334
Continuous unrealized losses existing for greater than 12 months, Unrealized losses	-36,650
Total, Fair value	1,155,575
Total, Unrealized losses	-83,481
US Treasury [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Continuous unrealized losses existing for less than 12 months, Fair value	0
Continuous unrealized losses existing for less than 12 months, Unrealized losses	0
Continuous unrealized losses existing for greater than 12 months, Fair value	185,969
Continuous unrealized losses existing for greater than 12 months, Unrealized losses	-14,194
Total, Fair value	185,969
Total, Unrealized losses	-14,194
U.S. Government Agencies [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Continuous unrealized losses existing for less than 12 months, Fair value	463,254
Continuous unrealized losses existing for less than 12 months, Unrealized losses	-42,295
Continuous unrealized losses existing for greater than 12 months, Fair value	54,128
Continuous unrealized losses existing for greater than 12 months, Unrealized losses	-7,561
Total, Fair value	517,382
Total, Unrealized losses	-49,856
Municipal [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Continuous unrealized losses existing for less than 12 months, Fair value	61,280
Continuous unrealized losses existing for less than 12 months, Unrealized losses	-2,683
Continuous unrealized losses existing for greater than 12 months, Fair value	9,484
Continuous unrealized losses existing for greater than 12 months, Unrealized losses	-484
Total, Fair value	70,764
Total, Unrealized losses	-3,167
Corporate Notes, Financial Issuers [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Continuous unrealized losses existing for less than 12 months, Fair value	1,327
Continuous unrealized losses existing for less than 12 months, Unrealized losses	-10
Continuous unrealized losses existing for greater than 12 months, Fair value	57,474
Continuous unrealized losses existing for greater than 12 months, Unrealized losses	-1,725
Total, Fair value	58,801
Total, Unrealized losses	-1,735
Corporate Notes, Other [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Continuous unrealized losses existing for less than 12 months, Fair value	997
Continuous unrealized losses existing for less than 12 months, Unrealized losses	-3
Continuous unrealized losses existing for greater than 12 months, Fair value	0
Continuous unrealized losses existing for greater than 12 months, Unrealized losses	0
Total, Fair value	997
Total, Unrealized losses	-3
Mortgage-Backed Securities [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Continuous unrealized losses existing for less than 12 months, Fair value	137,042
Continuous unrealized losses existing for less than 12 months, Unrealized losses	-1,352
Continuous unrealized losses existing for greater than 12 months, Fair value	137,661
Continuous unrealized losses existing for greater than 12 months, Unrealized losses	-11,836
Total, Fair value	274,703
Total, Unrealized losses	-13,188
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	21,045
Continuous unrealized losses existing for less than 12 months, Unrealized losses	-275
Continuous unrealized losses existing for greater than 12 months, Fair value	11,944
Continuous unrealized losses existing for greater than 12 months, Unrealized losses	-524
Total, Fair value	32,989
Total, Unrealized losses	-799
Other Equity Securities [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Continuous unrealized losses existing for less than 12 months, Fair value	8,296
Continuous unrealized losses existing for less than 12 months, Unrealized losses	-213
Continuous unrealized losses existing for greater than 12 months, Fair value	5,674
Continuous unrealized losses existing for greater than 12 months, Unrealized losses	-326
Total, Fair value	13,970
Total, Unrealized losses	($539)

AvailableForSale_Securities_Sc1

Available-For-Sale Securities (Schedule Of Realized Gain (Loss)) (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Available-for-sale Securities [Abstract]	'	'
Realized gains	$55	$313
Realized losses	-88	-62
Net realized gains	-33	251
Other than temporary impairment charges	0	0
(Losses) gains on available-for-sale securities, net	-33	251
Proceeds from sales of available-for-sale securities	$14,800	$41,056

AvailableForSale_Securities_In

Available-For-Sale Securities (Investments Classified by Contractual Maturity Date) (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'	'
Due in one year or less, Amortized Cost	$203,749	$268,847	$247,388
Due in one to five years, Amortized Cost	338,130	358,108	337,431
Due in five to ten years, Amortized Cost	344,296	350,372	357,677
Due after ten years, Amortized Cost	652,206	616,840	509,441
Available-for-sale securities, Amortized Cost	2,015,966	2,265,118	1,867,574
Due in one year or less, Fair Value	203,942	269,168	247,836
Due in one to five years, Fair Value	338,980	358,357	338,633
Due in five to ten years, Fair Value	330,546	330,020	356,871
Due after ten years, Fair Value	605,352	561,992	507,152
Available-for-sale securities, at fair value	1,949,697	2,176,290	1,870,831
Asset-backed Securities [Member]	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'
Available-for-sale securities, Amortized Cost	427,015	620,419	363,224
Available-for-sale securities, at fair value	417,303	605,225	368,282
Other Equity Securities [Member]	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'
Available-for-sale securities, Amortized Cost	50,570	50,532	52,413
Available-for-sale securities, at fair value	$53,574	$51,528	$52,057

AvailableForSale_Securities_Na

Available-For-Sale Securities (Narrative) (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
In Billions, unless otherwise specified	securities
Available-for-sale Securities [Abstract]	'	'	'
Pledged Securities, carrying value	$1.20	$1.20	$1.10
Number of securities by a single non-goverment sponsored issuer exceeding 10% of shareholders' equity	0	'	'

Loans_Summary_Of_Loan_Portfoli

Loans (Summary Of Loan Portfolio) (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
In Thousands, unless otherwise specified
Loans [Line Items]	'	'	'
Loans, net of unearned income, excluding covered loans	$13,133,160	$12,896,602	$11,900,312
Covered loans	312,478	346,431	518,661
Total loans	13,445,638	13,243,033	12,418,973
Total loans, percentage	98.00%	97.00%	96.00%
Covered loans, percentage	2.00%	3.00%	4.00%
Percentage of Loans Net of Unearned Income Including Covered Loans	100.00%	100.00%	100.00%
Commercial	'	'	'
Loans [Line Items]	'	'	'
Loans, net of unearned income, excluding covered loans	3,439,197	3,253,687	2,872,695
Total loans, percentage	26.00%	25.00%	23.00%
Commercial real-estate	'	'	'
Loans [Line Items]	'	'	'
Loans, net of unearned income, excluding covered loans	4,262,255	4,230,035	3,990,465
Total loans, percentage	32.00%	32.00%	32.00%
Home equity	'	'	'
Loans [Line Items]	'	'	'
Loans, net of unearned income, excluding covered loans	707,748	719,137	759,218
Total loans, percentage	5.00%	5.00%	6.00%
Residential real-estate	'	'	'
Loans [Line Items]	'	'	'
Loans, net of unearned income, excluding covered loans	426,769	434,992	360,652
Total loans, percentage	3.00%	3.00%	3.00%
Premium finance receivables | Commercial insurance loans	'	'	'
Loans [Line Items]	'	'	'
Loans, net of unearned income, excluding covered loans	2,208,361	2,167,565	1,997,160
Total loans, percentage	17.00%	16.00%	16.00%
Premium finance receivables | Life insurance	'	'	'
Loans [Line Items]	'	'	'
Loans, net of unearned income, excluding covered loans	1,929,334	1,923,698	1,753,512
Total loans, percentage	14.00%	15.00%	14.00%
Consumer and other	'	'	'
Loans [Line Items]	'	'	'
Loans, net of unearned income, excluding covered loans	$159,496	$167,488	$166,610
Total loans, percentage	1.00%	1.00%	2.00%

Loans_Unpaid_Principal_Balance

Loans (Unpaid Principal Balance And Carrying Value Of Acquired Loans) (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Bank Acquisitions [Member]	'	'
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]	'	'
Unpaid Principal Balance	$407,157	$453,944
Carrying Value	303,362	338,517
Life Insurance Premium Finance Acquisition [Member]	'	'
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]	'	'
Unpaid Principal Balance	424,680	437,155
Carrying Value	$413,202	$423,906

Loans_Activity_Related_To_Accr

Loans (Activity Related To Accretable Yield Of Loans Acquired With Evidence Of Credit Quality Deterioration Since Origination) (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]	'		'
Certain Loans Acquired In Transfer Not Accounted fo as Debt Securities, Accretable Yield, To Be Amortized To Indem Asset	$28,100,000		'
Bank Acquisitions [Member]	'		'
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]	'		'
Accretable yield, beginning balance	107,655,000		143,224,000
Acquisitions	0		-78,000
Accretable yield amortized to interest income	-7,770,000		-9,577,000
Accretable yield amortized to indemnification asset	-5,648,000	[1]	-8,706,000	[1]
Reclassification from non-accretable difference	8,580,000	[2]	5,412,000	[2]
(Decreases) increases in interest cash flows due to payments and changes in interest rates	-5,143,000		-8,550,000
Accretable yield, ending balance	97,674,000	[3]	121,725,000	[3]
Life Insurance Premium Finance Loans [Member]	'		'
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]	'		'
Accretable yield, beginning balance	8,254,000		13,055,000
Acquisitions	0		0
Accretable yield amortized to interest income	-1,771,000		-2,019,000
Accretable yield amortized to indemnification asset	0	[1]	0	[1]
Reclassification from non-accretable difference	0	[2]	0	[2]
(Decreases) increases in interest cash flows due to payments and changes in interest rates	78,000		182,000
Accretable yield, ending balance	$6,561,000	[3]	$11,218,000	[3]
[1]	Represents the portion of the current period accreted yield, resulting from lower expected losses, applied to reduce the loss share indemnification asset.
[2]	Reclassification is the result of subsequent increases in expected principal cash flows.
[3]	As of March 31, 2014, the Company estimates that the remaining accretable yield balance to be amortized to the indemnification asset for the bank acquisitions is $28.1 million. The remainder of the accretable yield related to bank acquisitions is expected to be amortized to interest income.

Loans_Narrative_Detail

Loans (Narrative) (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
				Bank Acquisitions [Member]	Bank Acquisitions [Member]
Schedule Of Accretable Yield Activity Related to Loans Acquired With Evidence Of Credit Quality Deterioration Since Origination Table [Text Block] [Line Items]	'	'	'	'	'
Certain Loans Acquired Accretable Yield Amortized To Interest Income	'	'	'	$7,770,000	$9,577,000
Deferred Discounts, Finance Charges and Interest Included in Receivables	40,300,000	41,900,000	40,000,000	'	'
Loans and Leases Receivable, Deferred Income	($6,200,000)	($9,200,000)	$10,500,000	'	'

Allowance_for_Loan_Losses_Allo2

Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans (Schedule Of Aging) (Detail) (USD $)	Mar. 31, 2014		Dec. 31, 2013		Mar. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	$92,008		$103,582		$120,375
90+ days and still accruing	66,697		86,484		127,875
60-89 days past due	33,108		39,698		39,657
30-59 days past due	109,334		84,566		114,324
Current	13,144,491		12,928,703		12,016,742
Loans, net of unearned income, excluding covered loans	13,133,160		12,896,602		11,900,312
Nonaccrual	82,872		94,157		118,555
90+ days and still accruing	30,866		30,202		12,393
60-89 days past due	26,426		33,821		38,203
30-59 days past due	102,292		76,629		102,056
Current	12,890,704		12,661,793		11,629,105
Covered loans, Nonaccrual	9,136		9,425		1,820
Covered loans, 90 plus days and still accruing	35,831		56,282		115,482
Covered loans, 60-89 days past due	6,682		5,877		1,454
Covered loans, 30-59 days past due	7,042		7,937		12,268
Covered loans, Current	253,787		266,910		387,637
Covered loans	312,478		346,431		518,661
Total loans	13,445,638		13,243,033		12,418,973
Commercial	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	11,782		10,780		18,373
90+ days and still accruing	1,466		274		449
60-89 days past due	2,235		5,882		1,633
30-59 days past due	27,663		11,755		23,148
Current	3,396,051		3,224,996		2,829,092
Loans, net of unearned income, excluding covered loans	3,439,197		3,253,687		2,872,695
Commercial | Commercial and industrial	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	11,112		10,143		17,717
90+ days and still accruing	387		0		0
60-89 days past due	2,235		4,938		1,150
30-59 days past due	16,150		7,404		16,710
Current	1,965,425		1,813,721		1,533,999
Loans, net of unearned income, excluding covered loans	1,995,309		1,836,206		1,569,576
Commercial | Franchise	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	0		0		125
90+ days and still accruing	0		0		0
60-89 days past due	0		400		0
30-59 days past due	75		0		76
Current	221,026		219,983		194,310
Loans, net of unearned income, excluding covered loans	221,101		220,383		194,511
Commercial | Mortgage warehouse line of credit	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	0		0		0
90+ days and still accruing	0		0		0
60-89 days past due	0		0		0
30-59 days past due	0		0		0
Current	60,809		67,470		131,970
Loans, net of unearned income, excluding covered loans	60,809		67,470		131,970
Commercial | Community Advantage - homeowners association	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	0		0		0
90+ days and still accruing	0		0		0
60-89 days past due	0		0		0
30-59 days past due	0		0		0
Current	91,414		90,894		82,763
Loans, net of unearned income, excluding covered loans	91,414		90,894		82,763
Commercial | Aircraft	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	0		0		0
90+ days and still accruing	0		0		0
60-89 days past due	0		0		0
30-59 days past due	0		0		0
Current	8,840		10,241		14,112
Loans, net of unearned income, excluding covered loans	8,840		10,241		14,112
Commercial | Asset-based lending	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	670		637		531
90+ days and still accruing	0		0		0
60-89 days past due	0		388		483
30-59 days past due	10,573		1,878		5,518
Current	729,425		732,190		680,723
Loans, net of unearned income, excluding covered loans	740,668		735,093		687,255
Commercial | Tax exempt	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	0		0		0
90+ days and still accruing	0		0		0
60-89 days past due	0		0		0
30-59 days past due	0		0		0
Current	177,973		161,239		89,508
Loans, net of unearned income, excluding covered loans	177,973		161,239		89,508
Commercial | Leases	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	0		0		0
90+ days and still accruing	0		0		0
60-89 days past due	0		0		0
30-59 days past due	0		788		844
Current	121,986		109,043		97,186
Loans, net of unearned income, excluding covered loans	121,986		109,831		98,030
Commercial | Other	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	0		0		0
90+ days and still accruing	0		0		0
60-89 days past due	0		0		0
30-59 days past due	0		0		0
Current	10,261		11,147		127
Loans, net of unearned income, excluding covered loans	10,261		11,147		127
Commercial | PCI - commercial	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	0	[1]	0	[1]	0	[1]
90+ days and still accruing	1,079	[1]	274	[1]	449	[1]
60-89 days past due	0	[1]	156	[1]	0	[1]
30-59 days past due	865	[1]	1,685	[1]	0	[1]
Current	8,892	[1]	9,068	[1]	4,394	[1]
Loans, net of unearned income, excluding covered loans	10,836	[1],[2]	11,183	[1],[2]	4,843	[1],[2]
Commercial real-estate	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	33,733		46,658		61,807
90+ days and still accruing	21,073		18,812		1,866
60-89 days past due	15,782		15,394		29,286
30-59 days past due	38,861		29,870		44,507
Current	4,152,806		4,119,301		3,852,999
Loans, net of unearned income, excluding covered loans	4,262,255		4,230,035		3,990,465
Commercial real-estate | Residential construction	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	0		149		3,094
90+ days and still accruing	0		0		0
60-89 days past due	680		0		945
30-59 days past due	27		0		0
Current	35,690		38,351		33,044
Loans, net of unearned income, excluding covered loans	36,397		38,500		37,083
Commercial real-estate | Commercial construction	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	844		6,969		1,086
90+ days and still accruing	0		0		0
60-89 days past due	0		0		9,521
30-59 days past due	0		505		0
Current	150,786		129,232		151,751
Loans, net of unearned income, excluding covered loans	151,630		136,706		162,358
Commercial real-estate | Land	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	2,405		2,814		17,976
90+ days and still accruing	0		0		0
60-89 days past due	2,682		4,224		0
30-59 days past due	3,438		619		11,563
Current	99,445		99,128		104,039
Loans, net of unearned income, excluding covered loans	107,970		106,785		133,578
Commercial real-estate | Office	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	6,970		10,087		3,564
90+ days and still accruing	0		0		0
60-89 days past due	1,672		2,265		8,990
30-59 days past due	8,868		3,862		4,797
Current	633,655		626,027		567,333
Loans, net of unearned income, excluding covered loans	651,165		642,241		584,684
Commercial real-estate | Industrial	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	6,101		5,654		7,137
90+ days and still accruing	0		0		0
60-89 days past due	1,114		585		0
30-59 days past due	2,706		914		986
Current	615,139		626,785		587,402
Loans, net of unearned income, excluding covered loans	625,060		633,938		595,525
Commercial real-estate | Retail	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	9,540		10,862		7,915
90+ days and still accruing	0		0		0
60-89 days past due	217		837		6,970
30-59 days past due	3,089		2,435		5,953
Current	664,584		642,125		565,963
Loans, net of unearned income, excluding covered loans	677,430		656,259		586,801
Commercial real-estate | Multi-family	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	1,327		2,035		2,088
90+ days and still accruing	0		0		0
60-89 days past due	0		0		1,036
30-59 days past due	3,820		348		4,315
Current	570,616		564,154		505,346
Loans, net of unearned income, excluding covered loans	575,763		566,537		512,785
Commercial real-estate | Mixed use and other	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	6,546		8,088		18,947
90+ days and still accruing	0		230		0
60-89 days past due	6,626		3,943		1,573
30-59 days past due	10,744		15,949		13,560
Current	1,337,320		1,344,244		1,288,754
Loans, net of unearned income, excluding covered loans	1,361,236		1,372,454		1,322,834
Commercial real-estate | PCI - commercial real-estate	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	0	[1]	0	[1]	0	[1]
90+ days and still accruing	21,073	[1]	18,582		1,866	[1]
60-89 days past due	2,791	[1]	3,540		251	[1]
30-59 days past due	6,169	[1]	5,238		3,333	[1]
Current	45,571	[1]	49,255		49,367	[1]
Loans, net of unearned income, excluding covered loans	75,604	[1],[2]	76,615	[2]	54,817	[1],[2]
Home equity	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	7,311		10,071		14,891
90+ days and still accruing	0		0		0
60-89 days past due	1,650		1,344		1,370
30-59 days past due	4,972		3,060		4,324
Current	693,815		704,662		738,633
Loans, net of unearned income, excluding covered loans	707,748		719,137		759,218
Residential real-estate	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	426,769		434,992		360,652
Residential real-estate | Residential real estate	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	14,385		14,974		9,606
90+ days and still accruing	0		0		0
60-89 days past due	946		1,689		782
30-59 days past due	4,889		5,032		8,680
Current	403,474		410,430		340,751
Loans, net of unearned income, excluding covered loans	423,694		432,125		359,819
Residential real-estate | PCI - residential real estate	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	0		0	[1]	0	[1]
90+ days and still accruing	1,414		1,988	[1]	0	[1]
60-89 days past due	0		0	[1]	198	[1]
30-59 days past due	248		0	[1]	0	[1]
Current	1,413		879	[1]	635	[1]
Loans, net of unearned income, excluding covered loans	3,075	[1],[2]	2,867	[1],[2]	833	[1],[2]
Premium finance receivables | Commercial insurance loans	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	14,517		10,537		12,068
90+ days and still accruing	6,808		8,842		7,677
60-89 days past due	5,600		6,912		4,647
30-59 days past due	20,777		24,094		19,323
Current	2,160,659		2,117,180		1,953,445
Loans, net of unearned income, excluding covered loans	2,208,361		2,167,565		1,997,160
Premium finance receivables | Life insurance loans	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	0		0		20
90+ days and still accruing	0		0		2,256
60-89 days past due	0		2,524		0
30-59 days past due	4,312		1,808		1,340
Current	1,511,820		1,495,460		1,250,165
Loans, net of unearned income, excluding covered loans	1,516,132		1,499,792		1,253,781
Premium finance receivables | PCI - life insurance loans	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	0	[1]	0	[1]	0	[1]
90+ days and still accruing	0	[1]	0	[1]	0	[1]
60-89 days past due	0	[1]	0	[1]	0	[1]
30-59 days past due	0	[1]	0	[1]	0	[1]
Current	413,202	[1]	423,906	[1]	499,731	[1]
Loans, net of unearned income, excluding covered loans	413,202	[1],[2]	423,906	[1],[2]	499,731	[1],[2]
Consumer and other	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	159,496		167,488		166,610
Consumer and other | Consumer and other	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	1,144		1,137		1,790
90+ days and still accruing	57		105		145
60-89 days past due	213		76		287
30-59 days past due	550		1,010		714
Current	157,290		163,956		161,036
Loans, net of unearned income, excluding covered loans	159,254		166,284		163,972
Consumer and other | PCI - consumer and other	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	0	[1]	0		0	[1]
90+ days and still accruing	48	[1]	181		0	[1]
60-89 days past due	0	[1]	0		0	[1]
30-59 days past due	20	[1]	0		20	[1]
Current	174	[1]	1,023		2,618	[1]
Loans, net of unearned income, excluding covered loans	$242	[2]	$1,204	[2]	$2,638	[1],[2]
[1]	PCI 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.
[2]	PCI loans represent loans acquired with evidence of credit quality deterioration since origination, in accordance with ASC 310-30. See Note 6 - 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 Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans (Summary Of Performing NonPerforming) (Detail) (USD $)	Mar. 31, 2014		Dec. 31, 2013		Mar. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	$13,133,160		$12,896,602		$11,900,312
Performing Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	13,043,036		12,793,268		11,771,679
Nonperforming Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	90,124		103,334		128,633
Commercial	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	3,439,197		3,253,687		2,872,695
Commercial | Performing Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	3,427,028		3,242,907		2,854,322
Commercial | Nonperforming Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	12,169		10,780		18,373
Commercial | Commercial and industrial	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	1,995,309		1,836,206		1,569,576
Commercial | Commercial and industrial | Performing Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	1,983,810		1,826,063		1,551,859
Commercial | Commercial and industrial | Nonperforming Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	11,499		10,143		17,717
Commercial | Franchise	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	221,101		220,383		194,511
Commercial | Franchise | Performing Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	221,101		220,383		194,386
Commercial | Franchise | Nonperforming Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	'		'		125
Commercial | Mortgage warehouse line of credit	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	60,809		67,470		131,970
Commercial | Mortgage warehouse line of credit | Performing Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	60,809		67,470		131,970
Commercial | Mortgage warehouse line of credit | Nonperforming Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	0		0		0
Commercial | Community Advantage - homeowners association	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	91,414		90,894		82,763
Commercial | Community Advantage - homeowners association | Performing Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	91,414		90,894		82,763
Commercial | Community Advantage - homeowners association | Nonperforming Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	0		0		0
Commercial | Aircraft	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	8,840		10,241		14,112
Commercial | Aircraft | Performing Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	8,840		10,241		14,112
Commercial | Aircraft | Nonperforming Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	0		0		0
Commercial | Asset-based lending	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	740,668		735,093		687,255
Commercial | Asset-based lending | Performing Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	739,998		734,456		686,724
Commercial | Asset-based lending | Nonperforming Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	670		637		531
Commercial | Tax exempt	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	177,973		161,239		89,508
Commercial | Tax exempt | Performing Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	177,973		161,239		89,508
Commercial | Tax exempt | Nonperforming Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	0		0		0
Commercial | Leases	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	121,986		109,831		98,030
Commercial | Leases | Performing Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	121,986		109,831		98,030
Commercial | Leases | Nonperforming Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	0		0		0
Commercial | Other	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	10,261		11,147		127
Commercial | Other | Performing Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	10,261		11,147		127
Commercial | Other | Nonperforming Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	0		0		0
Commercial | PCI - commercial	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	10,836	[1],[2]	11,183	[1],[2]	4,843	[1],[2]
Commercial | PCI - commercial | Performing Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	10,836	[1]	11,183	[1]	4,843	[1]
Commercial | PCI - commercial | Nonperforming Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	0	[1]	0	[1]	0	[1]
Commercial real-estate	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	4,262,255		4,230,035		3,990,465
Commercial real-estate | Performing Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	4,228,522		4,183,147		3,928,658
Commercial real-estate | Nonperforming Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	33,733		46,888		61,807
Commercial real-estate | Residential construction	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	36,397		38,500		37,083
Commercial real-estate | Residential construction | Performing Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	36,397		38,351		33,989
Commercial real-estate | Residential construction | Nonperforming Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	'		149		3,094
Commercial real-estate | Commercial construction	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	151,630		136,706		162,358
Commercial real-estate | Commercial construction | Performing Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	150,786		129,737		161,272
Commercial real-estate | Commercial construction | Nonperforming Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	844		6,969		1,086
Commercial real-estate | Land	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	107,970		106,785		133,578
Commercial real-estate | Land | Performing Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	105,565		103,971		115,602
Commercial real-estate | Land | Nonperforming Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	2,405		2,814		17,976
Commercial real-estate | Office	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	651,165		642,241		584,684
Commercial real-estate | Office | Performing Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	644,195		632,154		581,120
Commercial real-estate | Office | Nonperforming Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	6,970		10,087		3,564
Commercial real-estate | Industrial	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	625,060		633,938		595,525
Commercial real-estate | Industrial | Performing Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	618,959		628,284		588,388
Commercial real-estate | Industrial | Nonperforming Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	6,101		5,654		7,137
Commercial real-estate | Retail	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	677,430		656,259		586,801
Commercial real-estate | Retail | Performing Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	667,890		645,397		578,886
Commercial real-estate | Retail | Nonperforming Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	9,540		10,862		7,915
Commercial real-estate | Multi-family	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	575,763		566,537		512,785
Commercial real-estate | Multi-family | Performing Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	574,436		564,502		510,697
Commercial real-estate | Multi-family | Nonperforming Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	1,327		2,035		2,088
Commercial real-estate | Mixed use and other	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	1,361,236		1,372,454		1,322,834
Commercial real-estate | Mixed use and other | Performing Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	1,354,690		1,364,136		1,303,887
Commercial real-estate | Mixed use and other | Nonperforming Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	6,546		8,318		18,947
Commercial real-estate | PCI - commercial real-estate	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	75,604	[1],[2]	76,615	[1]	54,817	[1],[2]
Commercial real-estate | PCI - commercial real-estate | Performing Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	75,604	[1]	76,615	[1]	54,817	[1]
Commercial real-estate | PCI - commercial real-estate | Nonperforming Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	0	[1]	0	[1]	0	[1]
Home equity	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	707,748		719,137		759,218
Home equity | Performing Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	700,437		709,066		744,327
Home equity | Nonperforming Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	7,311		10,071		14,891
Residential real-estate	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	426,769		434,992		360,652
Residential real-estate | Residential real estate	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	423,694		432,125		359,819
Residential real-estate | Residential real estate | Performing Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	409,309		417,151		350,213
Residential real-estate | Residential real estate | Nonperforming Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	14,385		14,974		9,606
Residential real-estate | PCI - residential real estate	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	3,075	[1],[2]	2,867	[1],[2]	833	[1],[2]
Residential real-estate | PCI - residential real estate | Performing Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	3,075	[1]	2,867	[1]	833	[1]
Residential real-estate | PCI - residential real estate | Nonperforming Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	0	[1]	0	[1]	0	[1]
Premium finance receivables | Commercial insurance loans	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	2,208,361		2,167,565		1,997,160
Premium finance receivables | Commercial insurance loans | Performing Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	2,187,036		2,148,186		1,977,415
Premium finance receivables | Commercial insurance loans | Nonperforming Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	21,325		19,379		19,745
Premium finance receivables | Life insurance loans	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	1,516,132		1,499,792		1,253,781
Premium finance receivables | Life insurance loans | Performing Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	1,516,132		1,499,792		1,251,505
Premium finance receivables | Life insurance loans | Nonperforming Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	'		'		2,276
Premium finance receivables | PCI - life insurance loans	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	413,202	[1],[2]	423,906	[1],[2]	499,731	[1],[2]
Premium finance receivables | PCI - life insurance loans | Performing Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	413,202	[1]	423,906	[1]	499,731	[1]
Premium finance receivables | PCI - life insurance loans | Nonperforming Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	0	[1]	0	[1]	0	[1]
Consumer and other	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	159,496		167,488		166,610
Consumer and other | Consumer and other	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	159,254		166,284		163,972
Consumer and other | Consumer and other | Performing Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	158,053		165,042		162,037
Consumer and other | Consumer and other | Nonperforming Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	1,201		1,242		1,935
Consumer and other | PCI - consumer and other	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	242	[1]	1,204	[1]	2,638	[1],[2]
Consumer and other | PCI - consumer and other | Performing Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	242	[1]	1,204	[1]	2,638	[1]
Consumer and other | PCI - consumer and other | Nonperforming Financing Receivable [Member]	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	$0	[1]	$0	[1]	$0	[1]
[1]	PCI loans represent loans acquired with evidence of credit quality deterioration since origination, in accordance with ASC 310-30. See Note 6 - Loans for further discussion of these purchased loans.
[2]	PCI 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.

Allowance_for_Loan_Losses_Allo4

Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans (Summary Of Activity In Allowance For Credit Losses) (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'	'
Allowance for loan losses at beginning of period	$96,922	$107,351
Other adjustments	-148	-229
Reclassification from (to) allowance for unfunded lending-related commitments	-18	-213
Charge-offs	-9,017	-13,161
Recoveries	1,232	1,233
Provision for credit losses	3,304	15,367
Allowance for loan losses at period end	92,275	110,348
Allowance for unfunded lending-related commitments at period end	737	15,287
Allowance for credit losses at period end	93,012	125,635
Allowance for credit losses at period end, Individually evaluated for impairment	8,294	29,273
Allowance for credit losses at period end, Collectively evaluated for impairment	84,559	96,155
Allowance for credit losses at period end, Loans acquired with deteriorated credit quality	159	207
Loans at period end, Individually evaluated for impairment	144,985	203,554
Loans at period end, Collectively evaluated for impairment	12,485,216	11,133,896
Loans at period end, Loans acquired with deteriorated credit quality	502,959	562,862
Commercial	'	'
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'	'
Allowance for loan losses at beginning of period	23,092	28,794
Other adjustments	-15	-3
Reclassification from (to) allowance for unfunded lending-related commitments	0	0
Charge-offs	-648	-4,540
Recoveries	317	295
Provision for credit losses	1,943	4,406
Allowance for loan losses at period end	24,689	28,952
Allowance for unfunded lending-related commitments at period end	0	0
Allowance for credit losses at period end	24,689	28,952
Allowance for credit losses at period end, Individually evaluated for impairment	3,107	3,682
Allowance for credit losses at period end, Collectively evaluated for impairment	21,512	25,270
Allowance for credit losses at period end, Loans acquired with deteriorated credit quality	70	0
Loans at period end, Individually evaluated for impairment	18,350	27,447
Loans at period end, Collectively evaluated for impairment	3,410,011	2,840,405
Loans at period end, Loans acquired with deteriorated credit quality	10,836	4,843
Commercial real-estate	'	'
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'	'
Allowance for loan losses at beginning of period	48,658	52,135
Other adjustments	-121	-217
Reclassification from (to) allowance for unfunded lending-related commitments	-18	-213
Charge-offs	-4,493	-3,299
Recoveries	145	368
Provision for credit losses	434	7,634
Allowance for loan losses at period end	44,605	56,408
Allowance for unfunded lending-related commitments at period end	737	15,287
Allowance for credit losses at period end	45,342	71,695
Allowance for credit losses at period end, Individually evaluated for impairment	4,041	23,089
Allowance for credit losses at period end, Collectively evaluated for impairment	41,301	48,409
Allowance for credit losses at period end, Loans acquired with deteriorated credit quality	0	197
Loans at period end, Individually evaluated for impairment	99,480	145,203
Loans at period end, Collectively evaluated for impairment	4,087,171	3,790,445
Loans at period end, Loans acquired with deteriorated credit quality	75,604	54,817
Home equity	'	'
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'	'
Allowance for loan losses at beginning of period	12,611	12,734
Other adjustments	-1	0
Reclassification from (to) allowance for unfunded lending-related commitments	0	0
Charge-offs	-2,267	-2,397
Recoveries	257	162
Provision for credit losses	366	1,623
Allowance for loan losses at period end	10,966	12,122
Allowance for unfunded lending-related commitments at period end	0	0
Allowance for credit losses at period end	10,966	12,122
Allowance for credit losses at period end, Individually evaluated for impairment	596	1,748
Allowance for credit losses at period end, Collectively evaluated for impairment	10,370	10,374
Allowance for credit losses at period end, Loans acquired with deteriorated credit quality	0	0
Loans at period end, Individually evaluated for impairment	7,537	16,057
Loans at period end, Collectively evaluated for impairment	700,211	743,161
Loans at period end, Loans acquired with deteriorated credit quality	0	0
Residential real-estate	'	'
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'	'
Allowance for loan losses at beginning of period	5,108	5,560
Other adjustments	-2	-9
Reclassification from (to) allowance for unfunded lending-related commitments	0	0
Charge-offs	-226	-1,728
Recoveries	131	5
Provision for credit losses	-320	1,312
Allowance for loan losses at period end	4,691	5,140
Allowance for unfunded lending-related commitments at period end	0	0
Allowance for credit losses at period end	4,691	5,140
Allowance for credit losses at period end, Individually evaluated for impairment	455	598
Allowance for credit losses at period end, Collectively evaluated for impairment	4,147	4,532
Allowance for credit losses at period end, Loans acquired with deteriorated credit quality	89	10
Loans at period end, Individually evaluated for impairment	18,026	12,984
Loans at period end, Collectively evaluated for impairment	405,668	346,835
Loans at period end, Loans acquired with deteriorated credit quality	3,075	833
Premium finance receivables	'	'
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'	'
Allowance for loan losses at beginning of period	5,583	6,096
Other adjustments	-9	0
Reclassification from (to) allowance for unfunded lending-related commitments	0	0
Charge-offs	-1,210	-1,068
Recoveries	321	294
Provision for credit losses	897	749
Allowance for loan losses at period end	5,582	6,071
Allowance for unfunded lending-related commitments at period end	0	0
Allowance for credit losses at period end	5,582	6,071
Allowance for credit losses at period end, Individually evaluated for impairment	0	0
Allowance for credit losses at period end, Collectively evaluated for impairment	5,582	6,071
Allowance for credit losses at period end, Loans acquired with deteriorated credit quality	0	0
Loans at period end, Individually evaluated for impairment	0	0
Loans at period end, Collectively evaluated for impairment	3,724,493	3,250,941
Loans at period end, Loans acquired with deteriorated credit quality	413,202	499,731
Consumer and other	'	'
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'	'
Allowance for loan losses at beginning of period	1,870	2,032
Other adjustments	0	0
Reclassification from (to) allowance for unfunded lending-related commitments	0	0
Charge-offs	-173	-129
Recoveries	61	109
Provision for credit losses	-16	-357
Allowance for loan losses at period end	1,742	1,655
Allowance for unfunded lending-related commitments at period end	0	0
Allowance for credit losses at period end	1,742	1,655
Allowance for credit losses at period end, Individually evaluated for impairment	95	156
Allowance for credit losses at period end, Collectively evaluated for impairment	1,647	1,499
Allowance for credit losses at period end, Loans acquired with deteriorated credit quality	0	0
Loans at period end, Individually evaluated for impairment	1,592	1,863
Loans at period end, Collectively evaluated for impairment	157,662	162,109
Loans at period end, Loans acquired with deteriorated credit quality	$242	$2,638

Allowance_for_Loan_Losses_Allo5

Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans (Summary Of Activity In The Allowance For Covered Loan Losses) (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Allowance for Covered Loan Losses [Roll Forward]	'	'
Balance at beginning of period	$10,092	$13,454
Provision for covered loan losses before benefit attributable to FDIC loss share agreements	-7,121	1,600
Benefit attributable to FDIC loss share agreements	-5,697	1,280
Net provision for covered loan losses	-1,424	320
(Decrease) increase in FDIC indemnification asset	-5,697	1,280
Loans charged-off	2,864	2,791
Recoveries of loans charged-off	3,340	9
Net recoveries (charge-offs)	-476	2,782
Balance at end of period	$3,447	$12,272

Allowance_for_Loan_Losses_Allo6

Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans (Summary Of Impaired Loans, Including Restructured Loans) (Detail) (USD $)	Mar. 31, 2014		Dec. 31, 2013		Mar. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired loans with an allowance for loan loss required	$86,381	[1]	$92,184	[1]	$101,565	[1]
Impaired loans with no allowance for loan loss required	56,596		70,045		101,989
Total impaired loans	142,977	[2]	162,229	[2]	203,554	[2]
Allowance for loan losses related to impaired loans	8,197		8,265		14,607
Financing Receivable [Member]	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Allowance for loan losses related to impaired loans	4,000		'		'
TDRs	$92,517		$107,103		$116,345
[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 Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans (Summary Of Impaired Loans Eval For Impairment) (Detail) (USD $)	3 Months Ended				12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014		Mar. 31, 2013		Dec. 31, 2013
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with Related Allowance, Recorded Investment	$86,381	[1]	$101,565	[1]	$92,184	[1]
Related Allowance	8,197		14,607		8,265
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	56,596		101,989		70,045
Recorded Investment	142,977	[2]	203,554	[2]	162,229	[2]
Unpaid Principal Balance	168,203		229,615		195,455
Average Recorded Investment	145,257		209,208		170,658
Interest Income Recognized	1,915		2,636		8,920
Commercial | Commercial and industrial	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with Related Allowance, Recorded Investment	9,167		12,827		6,297
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	10,029		14,544		7,001
Related Allowance	2,459		3,627		1,078
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	9,340		13,034		6,611
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	120		230		354
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	7,789		13,963		9,890
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	14,415		17,153		16,333
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	8,179		14,344		13,928
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	208		226		1,043
Commercial | Franchise	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		125		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		1,544		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		1,189		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		26		0
Commercial | Mortgage warehouse line of credit	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		0
Commercial | Community Advantage - homeowners association	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		0
Commercial | Aircraft	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		0
Commercial | Asset-based lending	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with Related Allowance, Recorded Investment	670		511		282
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	2,465		511		294
Related Allowance	620		55		282
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	677		511		295
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	31		7		14
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		21		354
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		1,358		2,311
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		23		2,162
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		18		121
Commercial | Tax exempt	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		0
Commercial | Leases	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		0
Commercial | Other	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		0
Commercial real-estate | Residential construction	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		1,881		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		2,007		0
Related Allowance	0		405		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		1,976		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		23		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	891		3,208		1,463
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	891		3,579		1,530
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,245		3,708		1,609
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	12		42		64
Commercial real-estate | Commercial construction	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with Related Allowance, Recorded Investment	3,099		8,682		3,099
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	3,099		8,682		3,099
Related Allowance	24		49		18
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	3,099		8,983		3,098
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	28		86		115
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,466		3,970		7,710
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,471		4,450		13,227
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,418		4,016		9,680
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	17		49		722
Commercial real-estate | Land	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with Related Allowance, Recorded Investment	9,260		17,851		10,518
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	9,625		19,070		11,871
Related Allowance	174		2,380		259
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	9,688		17,861		10,323
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	79		104		411
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	4,982		11,305		5,035
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	8,764		16,304		8,813
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	4,985		12,048		5,384
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	109		203		418
Commercial real-estate | Office	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with Related Allowance, Recorded Investment	8,712		5,792		7,792
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	9,398		5,996		8,444
Related Allowance	1,069		659		1,253
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	8,767		5,853		8,148
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	90		61		333
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	6,260		8,283		10,379
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	6,301		8,357		11,717
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	6,266		8,306		10,925
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	83		95		610
Commercial real-estate | Industrial	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with Related Allowance, Recorded Investment	6,597		4,229		3,385
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	6,765		4,286		3,506
Related Allowance	513		1,241		193
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	5,985		4,244		3,638
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	81		65		179
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	2,298		5,541		5,087
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	2,470		5,653		5,267
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	2,314		5,563		5,160
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	47		74		328
Commercial real-estate | Retail	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with Related Allowance, Recorded Investment	12,763		16,734		17,511
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	12,903		17,316		17,638
Related Allowance	826		674		1,253
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	12,819		16,773		17,678
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	132		194		724
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	10,419		14,483		7,047
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	12,273		15,095		8,610
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	11,006		14,628		8,462
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	140		172		400
Commercial real-estate | Multi-family	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with Related Allowance, Recorded Investment	2,053		3,966		3,237
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	2,143		4,063		3,730
Related Allowance	122		152		235
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	2,057		4,044		2,248
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	23		42		139
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,078		2,200		608
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	2,013		4,541		1,030
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,201		2,618		903
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	23		54		47
Commercial real-estate | Mixed use and other	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with Related Allowance, Recorded Investment	25,420		18,910		28,935
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	25,591		20,337		29,051
Related Allowance	1,272		2,863		1,366
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	25,853		19,317		26,792
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	291		232		1,194
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	3,161		18,168		4,077
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	5,044		19,483		6,213
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	3,096		18,345		5,046
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	67		269		352
Home equity	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with Related Allowance, Recorded Investment	2,109		5,160		3,985
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	2,534		5,751		5,238
Related Allowance	596		1,748		1,593
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	2,117		5,488		4,855
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	24		57		236
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	5,428		10,897		6,312
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	7,044		13,179		7,790
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	5,777		11,395		6,307
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	73		131		324
Residential real-estate	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with Related Allowance, Recorded Investment	6,222		4,357		6,876
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	6,362		4,974		7,023
Related Allowance	427		598		626
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	6,094		4,365		6,335
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	68		49		273
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	11,541		8,627		10,761
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	14,427		9,053		13,585
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	11,699		8,703		9,443
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	137		94		393
Premium finance receivables | Commercial insurance loans	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		0
Premium finance receivables | Life insurance loans	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		0
Premium finance receivables | PCI - life insurance loans	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		0
Consumer and other	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with Related Allowance, Recorded Investment	309		665		267
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	367		665		269
Related Allowance	95		156		109
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	290		665		273
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	5		8		11
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,283		1,198		1,322
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,809		1,664		1,865
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,285		1,208		1,355
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	$27		$25		$115
[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 Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans (Summary Of The Post-Modification Balance Of Loans Restructured) (Detail) (USD $)	3 Months Ended				12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014		Mar. 31, 2013		Mar. 31, 2014		Mar. 31, 2013
	contracts		contracts
Financing Receivable, Modifications [Line Items]	'		'		'		'
Restructured loans	$5,245	[1],[2]	$2,277	[1],[2]	$25,648	[1],[3]	$35,106	[1],[3]
Troubled debt restructuring modifications, number of count	6	[1],[2]	14	[1],[2]	27	[1],[3]	58	[1],[3]
Extension at Below Market Terms [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Restructured loans	3,972	[1]	1,835	[1]	'		'
Troubled debt restructuring modifications, number of count	5	[1]	11	[1]	'		'
Reduction of Interest Rate [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Restructured loans	3,877	[1]	2,106	[1]	'		'
Troubled debt restructuring modifications, number of count	3	[1]	11	[1]	'		'
Modification to Interest Only Payments [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Restructured loans	2,439	[1]	308	[1]	'		'
Troubled debt restructuring modifications, number of count	3	[1]	3	[1]	'		'
Forgiveness of Debt [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Restructured loans	0	[1]	73	[1]	'		'
Troubled debt restructuring modifications, number of count	0	[1]	1	[1]	'		'
Commercial | Commercial and industrial	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Restructured loans	88	[1],[2]	708	[1],[2]	88	[1],[3]	14,901	[1],[3]
Troubled debt restructuring modifications, number of count	1	[1],[2]	6	[1],[2]	1	[1],[3]	21	[1],[3]
Commercial | Commercial and industrial | Extension at Below Market Terms [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Restructured loans	88	[1]	573	[1]	'		'
Troubled debt restructuring modifications, number of count	1	[1]	5	[1]	'		'
Commercial | Commercial and industrial | Reduction of Interest Rate [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Restructured loans	0	[1]	553	[1]	'		'
Troubled debt restructuring modifications, number of count	0	[1]	4	[1]	'		'
Commercial | Commercial and industrial | Modification to Interest Only Payments [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Restructured loans	88	[1]	185	[1]	'		'
Troubled debt restructuring modifications, number of count	1	[1]	2	[1]	'		'
Commercial | Commercial and industrial | Forgiveness of Debt [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Restructured loans	0	[1]	0	[1]	'		'
Troubled debt restructuring modifications, number of count	0	[1]	0	[1]	'		'
Commercial real-estate | Land	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Restructured loans	0	[1],[2]	287	[1],[2]	2,352	[1],[3]	4,131	[1],[3]
Troubled debt restructuring modifications, number of count	0	[1],[2]	2	[1],[2]	1	[1],[3]	5	[1],[3]
Commercial real-estate | Land | Extension at Below Market Terms [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Restructured loans	0	[1]	287	[1]	'		'
Troubled debt restructuring modifications, number of count	0	[1]	2	[1]	'		'
Commercial real-estate | Land | Reduction of Interest Rate [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Restructured loans	0	[1]	287	[1]	'		'
Troubled debt restructuring modifications, number of count	0	[1]	2	[1]	'		'
Commercial real-estate | Land | Modification to Interest Only Payments [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Restructured loans	0	[1]	0	[1]	'		'
Troubled debt restructuring modifications, number of count	0	[1]	0	[1]	'		'
Commercial real-estate | Land | Forgiveness of Debt [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Restructured loans	0	[1]	73	[1]	'		'
Troubled debt restructuring modifications, number of count	0	[1]	1	[1]	'		'
Commercial real-estate | Industrial	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Restructured loans	1,078	[1],[2]	0	[1],[2]	2,027	[1],[3]	727	[1],[3]
Troubled debt restructuring modifications, number of count	1	[1],[2]	0	[1],[2]	2	[1],[3]	1	[1],[3]
Commercial real-estate | Industrial | Extension at Below Market Terms [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Restructured loans	1,078	[1]	0	[1]	'		'
Troubled debt restructuring modifications, number of count	1	[1]	0	[1]	'		'
Commercial real-estate | Industrial | Reduction of Interest Rate [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Restructured loans	0	[1]	0	[1]	'		'
Troubled debt restructuring modifications, number of count	0	[1]	0	[1]	'		'
Commercial real-estate | Industrial | Modification to Interest Only Payments [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Restructured loans	1,078	[1]	0	[1]	'		'
Troubled debt restructuring modifications, number of count	1	[1]	0	[1]	'		'
Commercial real-estate | Industrial | Forgiveness of Debt [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Restructured loans	0	[1]	0	[1]	'		'
Troubled debt restructuring modifications, number of count	0	[1]	0	[1]	'		'
Commercial real-estate | Retail	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Restructured loans	202	[1],[2]	200	[1],[2]	202	[1],[3]	5,085	[1],[3]
Troubled debt restructuring modifications, number of count	1	[1],[2]	1	[1],[2]	1	[1],[3]	4	[1],[3]
Commercial real-estate | Retail | Extension at Below Market Terms [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Restructured loans	202	[1]	200	[1]	'		'
Troubled debt restructuring modifications, number of count	1	[1]	1	[1]	'		'
Commercial real-estate | Retail | Reduction of Interest Rate [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Restructured loans	0	[1]	200	[1]	'		'
Troubled debt restructuring modifications, number of count	0	[1]	1	[1]	'		'
Commercial real-estate | Retail | Modification to Interest Only Payments [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Restructured loans	0	[1]	0	[1]	'		'
Troubled debt restructuring modifications, number of count	0	[1]	0	[1]	'		'
Commercial real-estate | Retail | Forgiveness of Debt [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Restructured loans	0	[1]	0	[1]	'		'
Troubled debt restructuring modifications, number of count	0	[1]	0	[1]	'		'
Commercial real-estate | Multi-family	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Restructured loans	0	[1],[2]	705	[1],[2]	0	[1],[3]	1,085	[1],[3]
Troubled debt restructuring modifications, number of count	0	[1],[2]	1	[1],[2]	0	[1],[3]	2	[1],[3]
Commercial real-estate | Multi-family | Extension at Below Market Terms [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Restructured loans	0	[1]	705	[1]	'		'
Troubled debt restructuring modifications, number of count	0	[1]	1	[1]	'		'
Commercial real-estate | Multi-family | Reduction of Interest Rate [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Restructured loans	0	[1]	705	[1]	'		'
Troubled debt restructuring modifications, number of count	0	[1]	1	[1]	'		'
Commercial real-estate | Multi-family | Modification to Interest Only Payments [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Restructured loans	0	[1]	0	[1]	'		'
Troubled debt restructuring modifications, number of count	0	[1]	0	[1]	'		'
Commercial real-estate | Multi-family | Forgiveness of Debt [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Restructured loans	0	[1]	0	[1]	'		'
Troubled debt restructuring modifications, number of count	0	[1]	0	[1]	'		'
Commercial real-estate | Mixed use and other	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Restructured loans	3,877	[1],[2]	0	[1],[2]	8,919	[1],[3]	6,061	[1],[3]
Troubled debt restructuring modifications, number of count	3	[1],[2]	0	[1],[2]	9	[1],[3]	12	[1],[3]
Commercial real-estate | Mixed use and other | Extension at Below Market Terms [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Restructured loans	2,604	[1]	0	[1]	'		'
Troubled debt restructuring modifications, number of count	2	[1]	0	[1]	'		'
Commercial real-estate | Mixed use and other | Reduction of Interest Rate [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Restructured loans	3,877	[1]	0	[1]	'		'
Troubled debt restructuring modifications, number of count	3	[1]	0	[1]	'		'
Commercial real-estate | Mixed use and other | Modification to Interest Only Payments [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Restructured loans	1,273	[1]	0	[1]	'		'
Troubled debt restructuring modifications, number of count	1	[1]	0	[1]	'		'
Commercial real-estate | Mixed use and other | Forgiveness of Debt [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Restructured loans	0	[1]	0	[1]	'		'
Troubled debt restructuring modifications, number of count	0	[1]	0	[1]	'		'
Residential real estate and other	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Restructured loans	0	[1],[2]	377	[1],[2]	1,919	[1],[3]	969	[1],[3]
Troubled debt restructuring modifications, number of count	0	[1],[2]	4	[1],[2]	6	[1],[3]	10	[1],[3]
Residential real estate and other | Extension at Below Market Terms [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Restructured loans	0	[1]	70	[1]	'		'
Troubled debt restructuring modifications, number of count	0	[1]	2	[1]	'		'
Residential real estate and other | Reduction of Interest Rate [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Restructured loans	0	[1]	361	[1]	'		'
Troubled debt restructuring modifications, number of count	0	[1]	3	[1]	'		'
Residential real estate and other | Modification to Interest Only Payments [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Restructured loans	0	[1]	123	[1]	'		'
Troubled debt restructuring modifications, number of count	0	[1]	1	[1]	'		'
Residential real estate and other | Forgiveness of Debt [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Restructured loans	$0	[1]	$0	[1]	'		'
Troubled debt restructuring modifications, number of count	0	[1]	0	[1]	'		'
[1]	Balances represent the recorded investment in the loan at the time of the restructuring.
[2]	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.
[3]	Total TDRs represent all loans restructured in TDRs during the previous twelve months from the date indicated.

Allowance_for_Loan_Losses_Allo9

Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans (Summary Of Subsequent Default) (Detail) (USD $)	3 Months Ended				12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014		Mar. 31, 2013		Mar. 31, 2014		Mar. 31, 2013
	contracts		contracts
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]	'		'		'		'
Total, Count	6	[1],[2]	14	[1],[2]	27	[1],[3]	58	[1],[3]
Total, Balance	$5,245	[1],[2]	$2,277	[1],[2]	$25,648	[1],[3]	$35,106	[1],[3]
Payments in Default, Count	8	[1],[4]	14	[1],[4]	'		'
Payments in Default, Balance	9,984	[1],[4]	14,557	[1],[4]	'		'
Commercial | Commercial and industrial	'		'		'		'
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]	'		'		'		'
Total, Count	1	[1],[2]	6	[1],[2]	1	[1],[3]	21	[1],[3]
Total, Balance	88	[1],[2]	708	[1],[2]	88	[1],[3]	14,901	[1],[3]
Payments in Default, Count	0	[1],[4]	6	[1],[4]	'		'
Payments in Default, Balance	0	[1],[4]	10,377	[1],[4]	'		'
Commercial real-estate | Residential construction	'		'		'		'
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]	'		'		'		'
Total, Count	'		'		0	[1],[3]	3	[1],[3]
Total, Balance	'		'		0	[1],[3]	2,147	[1],[3]
Payments in Default, Count	0	[1],[4]	0	[1],[4]	'		'
Payments in Default, Balance	0	[1],[4]	0	[1],[4]	'		'
Commercial real-estate | Commercial construction	'		'		'		'
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]	'		'		'		'
Total, Count	'		'		3	[1],[3]	0	[1],[3]
Total, Balance	'		'		6,120	[1],[3]	0	[1],[3]
Payments in Default, Count	3	[1],[4]	0	[1],[4]	'		'
Payments in Default, Balance	6,120	[1],[4]	0	[1],[4]	'		'
Commercial real-estate | Land	'		'		'		'
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]	'		'		'		'
Total, Count	0	[1],[2]	2	[1],[2]	1	[1],[3]	5	[1],[3]
Total, Balance	0	[1],[2]	287	[1],[2]	2,352	[1],[3]	4,131	[1],[3]
Payments in Default, Count	0	[1],[4]	1	[1],[4]	'		'
Payments in Default, Balance	0	[1],[4]	651	[1],[4]	'		'
Commercial real-estate | Office	'		'		'		'
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]	'		'		'		'
Total, Count	'		'		4	[1],[3]	0	[1],[3]
Total, Balance	'		'		4,021	[1],[3]	0	[1],[3]
Payments in Default, Count	3	[1],[4]	0	[1],[4]	'		'
Payments in Default, Balance	3,465	[1],[4]	0	[1],[4]	'		'
Commercial real-estate | Industrial	'		'		'		'
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]	'		'		'		'
Total, Count	1	[1],[2]	0	[1],[2]	2	[1],[3]	1	[1],[3]
Total, Balance	1,078	[1],[2]	0	[1],[2]	2,027	[1],[3]	727	[1],[3]
Payments in Default, Count	0	[1],[4]	0	[1],[4]	'		'
Payments in Default, Balance	0	[1],[4]	0	[1],[4]	'		'
Commercial real-estate | Retail	'		'		'		'
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]	'		'		'		'
Total, Count	1	[1],[2]	1	[1],[2]	1	[1],[3]	4	[1],[3]
Total, Balance	202	[1],[2]	200	[1],[2]	202	[1],[3]	5,085	[1],[3]
Payments in Default, Count	0	[1],[4]	0	[1],[4]	'		'
Payments in Default, Balance	0	[1],[4]	0	[1],[4]	'		'
Commercial real-estate | Multi-family	'		'		'		'
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]	'		'		'		'
Total, Count	0	[1],[2]	1	[1],[2]	0	[1],[3]	2	[1],[3]
Total, Balance	0	[1],[2]	705	[1],[2]	0	[1],[3]	1,085	[1],[3]
Payments in Default, Count	0	[1],[4]	1	[1],[4]	'		'
Payments in Default, Balance	0	[1],[4]	705	[1],[4]	'		'
Commercial real-estate | Mixed use and other	'		'		'		'
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]	'		'		'		'
Total, Count	3	[1],[2]	0	[1],[2]	9	[1],[3]	12	[1],[3]
Total, Balance	3,877	[1],[2]	0	[1],[2]	8,919	[1],[3]	6,061	[1],[3]
Payments in Default, Count	2	[1],[4]	4	[1],[4]	'		'
Payments in Default, Balance	399	[1],[4]	2,603	[1],[4]	'		'
Residential real estate and other	'		'		'		'
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]	'		'		'		'
Total, Count	0	[1],[2]	4	[1],[2]	6	[1],[3]	10	[1],[3]
Total, Balance	0	[1],[2]	377	[1],[2]	1,919	[1],[3]	969	[1],[3]
Payments in Default, Count	0	[1],[4]	2	[1],[4]	'		'
Payments in Default, Balance	$0	[1],[4]	$221	[1],[4]	'		'
[1]	Balances represent the recorded investment in the loan at the time of the restructuring.
[2]	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.
[3]	Total TDRs represent all loans restructured in TDRs during the previous twelve months from the date indicated.
[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 Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans (Narrative) (Detail) (USD $)	3 Months Ended				12 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Mar. 31, 2014		Mar. 31, 2013		Dec. 31, 2013
	contracts		contracts
Financing Receivable, Allowance for Credit Losses [Line Items]	'		'		'		'		'
Troubled debt restructuring modifications, number of count	6	[1],[2]	14	[1],[2]	27	[1],[3]	58	[1],[3]	'
Allowance for loan losses related to impaired loans	$8,197,000		$14,607,000		$8,197,000		$14,607,000		$8,265,000
Restructured loans	5,245,000	[1],[2]	2,277,000	[1],[2]	25,648,000	[1],[3]	35,106,000	[1],[3]	'
Weighted average extension term	'13 months		'21 months		'		'		'
Weighted average interest only term	'9 months		'8 months		'		'		'
Loan forgiveness	0		50,000		'		'		'
Weighted average stated interest rate, basis points	1.76%		1.53%		'		'		'
Financing Receivable [Member]	'		'		'		'		'
Financing Receivable, Allowance for Credit Losses [Line Items]	'		'		'		'		'
Restructured loans	92,517,000		116,345,000		92,517,000		116,345,000		107,103,000
Troubled debt restructuring modifications, number of count	143		'		'		'		'
Allowance for loan losses related to impaired loans	4,000,000		'		4,000,000		'		'
Interest income	132,000		229,000		'		'		'
Modification to Interest Only Payments [Member]	'		'		'		'		'
Financing Receivable, Allowance for Credit Losses [Line Items]	'		'		'		'		'
Troubled debt restructuring modifications, number of count	3	[1]	3	[1]	'		'		'
Restructured loans	$2,439,000	[1]	$308,000	[1]	'		'		'
[1]	Balances represent the recorded investment in the loan at the time of the restructuring.
[2]	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.
[3]	Total TDRs represent all loans restructured in TDRs during the previous twelve months from the date indicated.

Recovered_Sheet2

Goodwill And Other Intangible Assets (Goodwill Assets By Business Segment) (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Goodwill [Roll Forward]	'	'
Beginning balance	$374,547	$343,632
Goodwill Acquired	0	'
Impairment Loss	0	'
Goodwill Adjustments	-822	'
Ending balance	373,725	343,632
Community banking	'	'
Goodwill [Roll Forward]	'	'
Beginning balance	305,313	'
Goodwill Acquired	0	'
Impairment Loss	0	'
Goodwill Adjustments	0	'
Ending balance	305,313	'
Specialty finance	'	'
Goodwill [Roll Forward]	'	'
Beginning balance	37,370	'
Goodwill Acquired	0	'
Impairment Loss	0	'
Goodwill Adjustments	-822	'
Ending balance	36,548	'
Wealth management	'	'
Goodwill [Roll Forward]	'	'
Beginning balance	31,864	'
Goodwill Acquired	0	'
Impairment Loss	0	'
Goodwill Adjustments	0	'
Ending balance	$31,864	'

Recovered_Sheet3

Goodwill And Other Intangible Assets (Summary of Finite-Lived Intangible Assets) (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
In Thousands, unless otherwise specified
Finite-Lived Intangible Assets [Line Items]	'	'	'
Other intangible assets	$18,050	$19,213	$19,510
Core deposit intangibles | Community banking	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'
Gross carrying amount	40,770	40,770	37,860
Accumulated amortization	-30,209	-29,189	-26,127
Net carrying amount	10,561	11,581	11,733
Customer list intangibles | Specialty finance	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'
Gross carrying amount	1,800	1,800	1,800
Accumulated amortization	-842	-805	-688
Net carrying amount	958	995	1,112
Customer list and other intangibles | Wealth management	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'
Gross carrying amount	7,690	7,690	7,390
Accumulated amortization	-1,159	-1,053	-725
Net carrying amount	$6,531	$6,637	$6,665

Goodwill_And_Other_Intangible_2

Goodwill And Other Intangible Assets (Estimated Amortization) (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'	'
Actual in three months ended March 31, 2014	$1,163	$1,120
Estimated remaining in 2014	3,207	'
Estimated-2015	2,791	'
Estimated-2016	2,180	'
Estimated-2017	1,764	'
Estimated-2018	$1,544	'

Goodwill_And_Other_Intangible_3

Goodwill And Other Intangible Assets (Narrative) (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Indefinite-lived Intangible Assets [Line Items]	'	'
Amortization of other intangible assets	$1,163,000	$1,120,000
Community banking | Core deposit intangibles	'	'
Indefinite-lived Intangible Assets [Line Items]	'	'
Amortization period in years, core deposit intangibles	'10 years	'
Specialty finance	'	'
Indefinite-lived Intangible Assets [Line Items]	'	'
Goodwill, Period Increase (Decrease)	($822,000)	'
Specialty finance | Customer list intangibles	'	'
Indefinite-lived Intangible Assets [Line Items]	'	'
Amortization period in years, core deposit intangibles	'18 years	'
Wealth management | Customer list intangibles	'	'
Indefinite-lived Intangible Assets [Line Items]	'	'
Amortization period in years, core deposit intangibles	'10 years	'

Deposits_Summary_Of_Deposits_D

Deposits (Summary Of Deposits) (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
In Thousands, unless otherwise specified
Deposits [Abstract]	'	'	'
Non-interest bearing	$2,773,922	$2,721,771	$2,243,440
NOW	1,983,251	1,953,882	2,043,227
Wealth management deposits	1,289,134	1,013,850	868,119
Money market	3,454,271	3,359,999	2,879,636
Savings	1,443,943	1,392,575	1,258,682
Time certificates of deposit	4,184,524	4,226,712	4,669,653
Total deposits	$15,129,045	$14,668,789	$13,962,757
Non-interest bearing, Mix	18.00%	19.00%	16.00%
NOW, Mix	13.00%	13.00%	15.00%
Wealth management deposits, Mix	8.00%	7.00%	6.00%
Money market, Mix	23.00%	23.00%	21.00%
Savings, Mix	10.00%	9.00%	9.00%
Time certificates of deposit, Mix	28.00%	29.00%	33.00%
Total deposits, Mix	100.00%	100.00%	100.00%

Notes_Payable_Federal_Home_Loa2

Notes Payable, Federal Home Loan Bank Advances, Other Borrowings and Subordinated Notes (Summary Of Notes Payable, Federal Home Loan Bank Advances, Other Borrowings, Secured Borrowings And Subordinated Notes) (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
In Thousands, unless otherwise specified
Debt Disclosure [Abstract]	'	'	'
Notes payable	$182	$364	$31,911
Federal Home Loan Bank advances	387,672	417,762	414,032
Securities sold under repurchase agreements	211,692	235,347	224,297
Other	19,212	19,393	31,947
Total other borrowings	230,904	254,740	256,244
Subordinated notes	0	0	15,000
Total notes payable, Federal Home Loan Bank advances, other borrowings and subordinated notes	$618,758	$672,866	$717,187

Notes_Payable_Federal_Home_Loa3

Notes Payable, Federal Home Loan Bank Advances, Other Borrowings and Subordinated Notes (Narrative) (Detail) (USD $)

3 Months Ended

3 Months Ended

9 Months Ended

12 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

0 Months Ended

3 Months Ended

12 Months Ended

1 Months Ended

3 Months Ended

Mar. 31, 2014

Mar. 31, 2013

Dec. 31, 2013

Sep. 30, 2013

Mar. 31, 2014

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2013

Sep. 30, 2013

Dec. 31, 2013

Mar. 31, 2014

Sep. 30, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2013

Mar. 31, 2014

Mar. 15, 2011

Mar. 31, 2014

Dec. 31, 2013

Dec. 31, 2010

Dec. 15, 2013

Dec. 07, 2010

Nov. 30, 2013

Mar. 31, 2013

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

subordinated_notes

Subordinated Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Notes Payable to Banks [Member]

Notes Payable to Banks [Member]

Revolving credit facility

Revolving credit facility

Securities Sold under Agreements to Repurchase [Member]

Securities Sold under Agreements to Repurchase [Member]

Securities Sold under Agreements to Repurchase [Member]

Borrowings From Banks And Brokers [Member]

Borrowings From Banks And Brokers [Member]

Borrowings From 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]

Junior Subordinated Debt [Member]

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

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

Base Rate Loan [Member]

Base Rate Loan [Member]

Base Rate Loan [Member]

Base Rate Loan [Member]

Eurodollar Rate Loan [Member]

Eurodollar Rate Loan [Member]

Eurodollar Rate [Member]

Federal Funds Rate [Member]

Base Rate [Member]

Prime Rate [Member]

London Interbank Offered Rate (LIBOR) [Member]

Base Rate [Member]

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Notes payable

$182,000

$31,911,000

$364,000

'

'

'

$364,000

$911,000

'

'

$0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Frequency of Periodic Payment

'

'

'

'

'

'quarterly

'

'

'

'

'quarterly

'

'

'

'

'

'

'

'monthly

'

'

'quarterly

'quarterly

'

'

'

'

'

'

'

'

'

'

Maturity date

'

'

'

'

'

30-Sep-14

'

'

1-Jun-15

'

6-Nov-14

25-Oct-13

'

'

'

'

'

'

1-Sep-17

'

15-Dec-13

'

15-Dec-13

'

'

'

31-May-15

'

'

'

'

'

'

Contractual rate

'

'

'

'

'

1.25%

'

'

'

'

'

'

'

'

'

'

'

'

3.75%

'

'

'

'

9.50%

'

'

'

'

'

'

'

'

'

Loan agreement with unaffiliated banks, amount

'

'

'

101,000,000

'

'

'

'

1,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Loan agreement with unaffiliated banks, amount

'

'

'

'

'

'

'

'

'

'

100,000,000

100,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from (Repayments of) Other Debt

-24,018,000

11,576,000

'

'

'

'

'

'

'

1,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3.50%

'

'

3.50%

Percentage of commitment fee payment

'

'

'

'

'

'

'

'

'

'

0.38%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Securities sold under repurchase agreements

211,692,000

224,297,000

235,347,000

'

'

'

'

'

'

'

'

'

31,700,000

55,300,000

44,300,000

180,000,000

180,000,000

180,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

'

'

'

'

'

'

'

'

'

'

'

122,100,000

'

'

192,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net Credit Exposure Repurchase Agreements

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Issuance Date

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

31-Aug-12

'

31-Dec-10

'

'

'

'

'

31-Oct-05

'

'

'

'

'

'

Other

19,212,000

31,947,000

19,393,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

19,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Junior subordinated notes

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

44,700,000

'

'

'

'

'

'

'

'

Quarterly principal and interest payments

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4,300,000

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Initial Payment

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Incremental interest rate over base rate

'

'

'

'

1.30%

1.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1.50%

1.00%

'

0.50%

2.50%

'

Subordinated notes

0

15,000,000

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

15,000,000

'

'

'

'

'

'

Number of Remaining Subordinated Notes

'

1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Early Repayment of Subordinated Debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$10,000,000

'

'

'

'

'

'

'

Junior_Subordinated_Debentures2

Junior Subordinated Debentures (Summary Of The Company's Junior Subordinated Debentures) (Detail) (USD $)

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2013

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

In Thousands, unless otherwise specified

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

First Northwest Capital Trust I

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

$249,493

$25,774

$20,619

$41,238

$51,550

$41,238

$51,547

$6,186

$6,186

$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

Incremental interest rate over base rate

'

'

'

3.25%

2.80%

2.60%

1.95%

1.45%

1.63%

3.00%

3.00%

3.00%

Contractual rate

'

'

'

3.49%

3.03%

2.83%

2.18%

1.68%

1.86%

3.24%

3.24%

3.23%

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

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

Earliest Redemption 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) (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2014	Jun. 30, 2013	Jun. 30, 2013
In Thousands, unless otherwise specified				Junior Subordinated Debt [Member]	cash flow hedge of junior subordinated debentures [Member]	cash flow hedge of junior subordinated debentures [Member]	cash flow hedge of junior subordinated debentures [Member]
				Rate	Cash Flow Hedging [Member]	Cash Flow Hedging [Member]	Cash Flow Hedging [Member]
					Designated as Hedging Instrument [Member]	Designated as Hedging Instrument [Member]	Designated as Hedging Instrument [Member]
					Interest Rate Swaps and Caps [Member]	Interest Rate Cap [Member]	Interest Rate Swap [Member]
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	$249,493	'	'	'	'
Debt, Weighted Average Interest Rate	'	'	'	2.42%	'	'	'
Notional Amount	'	'	'	'	$225,000	$90,000	'
Number of Derivative Contracts	'	'	'	'	'	2	2
Derivative, Maturity Date	'	'	'	'	'	'	30-Sep-13
Debt, Hedge Adjusted Weighted Average Interest Rate	3.17%	'	'	'	'	'	'
Consecutive quarters of deferred payment	20	'	'	'	'	'	'

Segment_Information_Summary_Of

Segment Information (Summary Of Certain Operating Information For Reportable Segments) (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]	'	'	'
Total net interest income	$144,006	$130,713	'
Total net interest income, Change in Contribution	13,293	'	'
Total net interest income, Change in Contribution Percentage	10.00%	'	'
Total non-interest income	45,529	57,379	'
Total non-interest income, Change in Contribution	-11,850	'	'
Total non-interest income, Change in Contribution Percentage	-21.00%	'	'
Total net revenue	189,535	188,092	'
Total net revenue, Change in Contribution	1,443	'	'
Total net revenue, Change in Contribution Percentage	1.00%	'	'
Total segment profit	34,500	32,052	'
Total segment profit, Change in Contribution	2,448	'	'
Total segment profit, Change in Contribution Percentage	8.00%	'	'
Total assets	18,221,163	17,074,247	18,097,783
Total segment assets, Change in Contribution	1,146,916	'	'
Total segment assets, Change in Contribution Percentage	7.00%	'	'
Operating Segments [Member]	'	'	'
Segment Reporting Information [Line Items]	'	'	'
Total net interest income	140,066	127,159	'
Total net interest income, Change in Contribution	12,907	'	'
Total net interest income, Change in Contribution Percentage	10.00%	'	'
Total non-interest income	52,141	63,348	'
Total non-interest income, Change in Contribution	-11,207	'	'
Total non-interest income, Change in Contribution Percentage	-18.00%	'	'
Total net revenue	192,207	190,507	'
Total net revenue, Change in Contribution	1,700	'	'
Total net revenue, Change in Contribution Percentage	1.00%	'	'
Operating Segments [Member] | Community banking	'	'	'
Segment Reporting Information [Line Items]	'	'	'
Total net interest income	116,755	106,230	'
Total net interest income, Change in Contribution	10,525	'	'
Total net interest income, Change in Contribution Percentage	10.00%	'	'
Total non-interest income	27,319	40,601	'
Total non-interest income, Change in Contribution	-13,282	'	'
Total non-interest income, Change in Contribution Percentage	-33.00%	'	'
Total net revenue	144,074	146,831	'
Total net revenue, Change in Contribution	-2,757	'	'
Total net revenue, Change in Contribution Percentage	-2.00%	'	'
Total segment profit	22,581	20,979	'
Total segment profit, Change in Contribution	1,602	'	'
Total segment profit, Change in Contribution Percentage	8.00%	'	'
Total assets	15,160,507	14,295,418	'
Total segment assets, Change in Contribution	865,089	'	'
Total segment assets, Change in Contribution Percentage	6.00%	'	'
Operating Segments [Member] | Specialty finance	'	'	'
Segment Reporting Information [Line Items]	'	'	'
Total net interest income	19,212	17,482	'
Total net interest income, Change in Contribution	1,730	'	'
Total net interest income, Change in Contribution Percentage	10.00%	'	'
Total non-interest income	7,881	7,305	'
Total non-interest income, Change in Contribution	576	'	'
Total non-interest income, Change in Contribution Percentage	8.00%	'	'
Total net revenue	27,093	24,787	'
Total net revenue, Change in Contribution	2,306	'	'
Total net revenue, Change in Contribution Percentage	9.00%	'	'
Total segment profit	8,982	8,629	'
Total segment profit, Change in Contribution	353	'	'
Total segment profit, Change in Contribution Percentage	4.00%	'	'
Total assets	2,532,362	2,291,140	'
Total segment assets, Change in Contribution	241,222	'	'
Total segment assets, Change in Contribution Percentage	11.00%	'	'
Operating Segments [Member] | Wealth management	'	'	'
Segment Reporting Information [Line Items]	'	'	'
Total net interest income	4,099	3,447	'
Total net interest income, Change in Contribution	652	'	'
Total net interest income, Change in Contribution Percentage	19.00%	'	'
Total non-interest income	16,941	15,442	'
Total non-interest income, Change in Contribution	1,499	'	'
Total non-interest income, Change in Contribution Percentage	10.00%	'	'
Total net revenue	21,040	18,889	'
Total net revenue, Change in Contribution	2,151	'	'
Total net revenue, Change in Contribution Percentage	11.00%	'	'
Total segment profit	2,937	2,444	'
Total segment profit, Change in Contribution	493	'	'
Total segment profit, Change in Contribution Percentage	20.00%	'	'
Total assets	528,294	487,689	'
Total segment assets, Change in Contribution	40,605	'	'
Total segment assets, Change in Contribution Percentage	8.00%	'	'
Intersegment Eliminations [Member]	'	'	'
Segment Reporting Information [Line Items]	'	'	'
Total net interest income	3,940	3,554	'
Total net interest income, Change in Contribution	386	'	'
Total net interest income, Change in Contribution Percentage	11.00%	'	'
Total non-interest income	-6,612	-5,969	'
Total non-interest income, Change in Contribution	-643	'	'
Total non-interest income, Change in Contribution Percentage	-11.00%	'	'
Total net revenue	-2,672	-2,415	'
Total net revenue, Change in Contribution	($257)	'	'
Total net revenue, Change in Contribution Percentage	-11.00%	'	'

Derivative_Financial_Instrumen2

Derivative Financial Instruments Derivative Financial Instruments (Interest Rate Cap Derivative Summary) (Detail) (USD $)	Mar. 31, 2014
In Thousands, unless otherwise specified
Interest Rate Cap Seventy Seven Million Notional May Two Thousand Fifteen Maturity [Member] | Not Designated as Hedging Instrument [Member]	'
Interest Rate Cap Derivative Summary [Line Items]	'
Notional Amount	$77,000
Fair Value as of End of Period	0
Interest Rate Cap Two Hundred Fifteen Million Notional May Two Thousand Sixteen Maturity [Member] | Not Designated as Hedging Instrument [Member]	'
Interest Rate Cap Derivative Summary [Line Items]	'
Notional Amount	215,000
Fair Value as of End of Period	391
Interest Rate Cap Ninety Six Million Five Hundred Thirty Thousand Notional April Two Thousand Fifteen Maturity [Member] | Not Designated as Hedging Instrument [Member]	'
Interest Rate Cap Derivative Summary [Line Items]	'
Notional Amount	96,530
Fair Value as of End of Period	0
Interest Rate Cap Fifty Six Million Five Hundred Thousand Notional August Two Thousand Sixteen Maturity [Member] | Not Designated as Hedging Instrument [Member]	'
Interest Rate Cap Derivative Summary [Line Items]	'
Notional Amount	56,500
Fair Value as of End of Period	246
Interest Rate Cap One Hundred Million Notional March Two Thousand Seventeen Maturity [Member] | Not Designated as Hedging Instrument [Member]	'
Interest Rate Cap Derivative Summary [Line Items]	'
Notional Amount	100,000
Fair Value as of End of Period	1,023
Interest Rate Cap Seventy Five Million Notional November Two Thousand Sixteen Maturity [Member] | Not Designated as Hedging Instrument [Member]	'
Interest Rate Cap Derivative Summary [Line Items]	'
Notional Amount	75,000
Fair Value as of End of Period	482
Total Interest Rate Cap [Member]	'
Interest Rate Cap Derivative Summary [Line Items]	'
Notional Amount	1,030,030
Fair Value as of End of Period	4,720
Cash Flow Hedging [Member] | Interest Rate Cap Twenty Million Notional September Two Thousand Fourteen Maturity [Member] | Designated as Hedging Instrument [Member]	'
Interest Rate Cap Derivative Summary [Line Items]	'
Notional Amount	20,000
Fair Value as of End of Period	0
Cash Flow Hedging [Member] | Interest Rate Cap Forty Million Notional September Two Thousand Fourteen Maturity [Member] | Designated as Hedging Instrument [Member]	'
Interest Rate Cap Derivative Summary [Line Items]	'
Notional Amount	40,000
Fair Value as of End of Period	0
Cash Flow Hedging [Member] | Interest Rate Cap Two Hundred Sixteen Million Five Hundred Thousand Notional August Two Thousand Sixteen Maturity [Member] | Designated as Hedging Instrument [Member]	'
Interest Rate Cap Derivative Summary [Line Items]	'
Notional Amount	216,500
Fair Value as of End of Period	801
Cash Flow Hedging [Member] | Interest Rate Cap Forty Three Million Five Hundred Thousand Notional August Two Thousand Sixteen Maturity [Member] [Member] | Designated as Hedging Instrument [Member]	'
Interest Rate Cap Derivative Summary [Line Items]	'
Notional Amount	43,500
Fair Value as of End of Period	190
Cash Flow Hedging [Member] | Interest Rate Cap Fifty Million Notional September Two Thousand Seventeen Maturity [Member] | Designated as Hedging Instrument [Member]	'
Interest Rate Cap Derivative Summary [Line Items]	'
Notional Amount	50,000
Fair Value as of End of Period	866
Cash Flow Hedging [Member] | Interest Rate Cap Forty Million Notional September Two Thousand Seventeen Maturity [Member] | Designated as Hedging Instrument [Member]	'
Interest Rate Cap Derivative Summary [Line Items]	'
Notional Amount	40,000
Fair Value as of End of Period	721
Cash Flow Hedging [Member] | Total Interest Rate Cap [Member] | Designated as Hedging Instrument [Member]	'
Interest Rate Cap Derivative Summary [Line Items]	'
Notional Amount	410,000
Fair Value as of End of Period	$2,578

Derivative_Financial_Instrumen3

Derivative Financial Instruments Derivative Financial Instruments (Schedule Of Fair Value Of Derivative Financial Instruments) (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
In Thousands, unless otherwise specified
Derivative [Line Items]	'	'	'
Derivative Assets, Fair Value, Amount not Offset Against Collateral	$37,239	$37,956	$46,653
Derivative Liabilities, Fair Value, Amount Not Offset Against Collateral	34,990	34,807	50,262
Other Assets [Member]	'	'	'
Derivative [Line Items]	'	'	'
Derivative Assets, Fair Value, Amount not Offset Against Collateral	51,529	48,221	52,436
Other Assets [Member] | Designated as Hedging Instrument [Member]	'	'	'
Derivative [Line Items]	'	'	'
Derivative Assets, Fair Value, Amount not Offset Against Collateral	2,668	1,883	94
Other Assets [Member] | Not Designated as Hedging Instrument [Member]	'	'	'
Derivative [Line Items]	'	'	'
Derivative Assets, Fair Value, Amount not Offset Against Collateral	48,861	46,338	52,342
Other Liabilities [Member]	'	'	'
Derivative [Line Items]	'	'	'
Derivative Liabilities, Fair Value, Amount Not Offset Against Collateral	37,797	37,264	54,745
Other Liabilities [Member] | Designated as Hedging Instrument [Member]	'	'	'
Derivative [Line Items]	'	'	'
Derivative Liabilities, Fair Value, Amount Not Offset Against Collateral	2,893	3,161	6,556
Other Liabilities [Member] | Not Designated as Hedging Instrument [Member]	'	'	'
Derivative [Line Items]	'	'	'
Derivative Liabilities, Fair Value, Amount Not Offset Against Collateral	34,904	34,103	48,189
Interest Rate Contract [Member] | Other Assets [Member] | Not Designated as Hedging Instrument [Member]	'	'	'
Derivative [Line Items]	'	'	'
Derivative Assets, Fair Value, Amount not Offset Against Collateral	34,571	36,073	46,559
Interest Rate Contract [Member] | Other Liabilities [Member] | Not Designated as Hedging Instrument [Member]	'	'	'
Derivative [Line Items]	'	'	'
Derivative Liabilities, Fair Value, Amount Not Offset Against Collateral	32,097	31,646	43,706
Interest Rate Contract [Member] | Cash Flow Hedging [Member] | Other Assets [Member] | Designated as Hedging Instrument [Member]	'	'	'
Derivative [Line Items]	'	'	'
Derivative Assets, Fair Value, Amount not Offset Against Collateral	2,578	1,776	1
Interest Rate Contract [Member] | Cash Flow Hedging [Member] | Other Liabilities [Member] | Designated as Hedging Instrument [Member]	'	'	'
Derivative [Line Items]	'	'	'
Derivative Liabilities, Fair Value, Amount Not Offset Against Collateral	2,892	3,160	6,556
Interest Rate Contract [Member] | Fair Value Hedging [Member] | Other Assets [Member] | Designated as Hedging Instrument [Member]	'	'	'
Derivative [Line Items]	'	'	'
Derivative Assets, Fair Value, Amount not Offset Against Collateral	90	107	93
Interest Rate Contract [Member] | Fair Value Hedging [Member] | Other Liabilities [Member] | Designated as Hedging Instrument [Member]	'	'	'
Derivative [Line Items]	'	'	'
Derivative Liabilities, Fair Value, Amount Not Offset Against Collateral	1	1	0
Interest Rate Lock Commitments [Member] | Other Assets [Member] | Not Designated as Hedging Instrument [Member]	'	'	'
Derivative [Line Items]	'	'	'
Derivative Assets, Fair Value, Amount not Offset Against Collateral	13,658	7,500	5,551
Interest Rate Lock Commitments [Member] | Other Liabilities [Member] | Not Designated as Hedging Instrument [Member]	'	'	'
Derivative [Line Items]	'	'	'
Derivative Liabilities, Fair Value, Amount Not Offset Against Collateral	115	147	1,315
Forward Commitments to Sell Mortgage Loans [Member] | Other Assets [Member] | Not Designated as Hedging Instrument [Member]	'	'	'
Derivative [Line Items]	'	'	'
Derivative Assets, Fair Value, Amount not Offset Against Collateral	625	2,761	213
Forward Commitments to Sell Mortgage Loans [Member] | Other Liabilities [Member] | Not Designated as Hedging Instrument [Member]	'	'	'
Derivative [Line Items]	'	'	'
Derivative Liabilities, Fair Value, Amount Not Offset Against Collateral	2,688	2,310	3,015
Foreign Exchange Contract [Member] | Other Assets [Member] | Not Designated as Hedging Instrument [Member]	'	'	'
Derivative [Line Items]	'	'	'
Derivative Assets, Fair Value, Amount not Offset Against Collateral	7	4	19
Foreign Exchange Contract [Member] | Other Liabilities [Member] | Not Designated as Hedging Instrument [Member]	'	'	'
Derivative [Line Items]	'	'	'
Derivative Liabilities, Fair Value, Amount Not Offset Against Collateral	$4	$0	$153

Derivative_Financial_Instrumen4

Derivative Financial Instruments Derivative Financial Instruments (Schedule Of Cash Flow Hedging Instruments) (Detail) (USD $)	Mar. 31, 2014
In Thousands, unless otherwise specified
Total Interest Rate Cap [Member]	'
Derivative [Line Items]	'
Notional Amount	$1,030,030
Fair Value Asset (Liability)	4,720
Cash Flow Hedging [Member] | Interest Rate Swaps and Caps [Member] | Designated as Hedging Instrument [Member]	'
Derivative [Line Items]	'
Notional Amount	485,000
Fair Value Asset (Liability)	-314
Cash Flow Hedging [Member] | Interest Rate Swap Fifty Million Notional September Two Thousand Sixteen Maturity [Member] | Designated as Hedging Instrument [Member]	'
Derivative [Line Items]	'
Notional Amount	50,000
Fair Value Asset (Liability)	-1,906
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]	'
Notional Amount	25,000
Fair Value Asset (Liability)	-986
Cash Flow Hedging [Member] | Total Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]	'
Derivative [Line Items]	'
Notional Amount	75,000
Fair Value Asset (Liability)	-2,892
Cash Flow Hedging [Member] | Interest Rate Cap Twenty Million Notional September Two Thousand Fourteen Maturity [Member] | Designated as Hedging Instrument [Member]	'
Derivative [Line Items]	'
Notional Amount	20,000
Fair Value Asset (Liability)	0
Cash Flow Hedging [Member] | Interest Rate Cap Forty Million Notional September Two Thousand Fourteen Maturity [Member] | Designated as Hedging Instrument [Member]	'
Derivative [Line Items]	'
Notional Amount	40,000
Fair Value Asset (Liability)	0
Cash Flow Hedging [Member] | Interest Rate Cap Fifty Million Notional September Two Thousand Seventeen Maturity [Member] | Designated as Hedging Instrument [Member]	'
Derivative [Line Items]	'
Notional Amount	50,000
Fair Value Asset (Liability)	866
Cash Flow Hedging [Member] | Interest Rate Cap Forty Million Notional September Two Thousand Seventeen Maturity [Member] | Designated as Hedging Instrument [Member]	'
Derivative [Line Items]	'
Notional Amount	40,000
Fair Value Asset (Liability)	721
Cash Flow Hedging [Member] | Total Interest Rate Cap [Member] | Designated as Hedging Instrument [Member]	'
Derivative [Line Items]	'
Notional Amount	410,000
Fair Value Asset (Liability)	$2,578

Derivative_Financial_Instrumen5

Derivative Financial Instruments Derivative Financial Instruments (Rollforward Of Amounts In Accumulated Other Comprehensive Income Related To Interest Rate Derivatives Designated As Cash Flow Hedges) (Detail) (Interest Rate Contract [Member], USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Interest Rate Contract [Member]	'	'
Rollforward of AOCI from Cash Flow Hedging Derivatives [Roll Forward]	'	'
Unrealized loss at beginning of period	($3,971)	($8,673)
Amount reclassified from accumulated other comprehensive income to interest expense on junior subordinated debentures	493	1,539
Amount of loss recognized in other comprehensive income	-591	-65
Unrealized loss at end of period	($4,069)	($7,199)

Derivative_Financial_Instrumen6

Derivative Financial Instruments Derivative Financial Instruments (Derivatives Used To Hedge Changes In Fair Value Attributable To Interest Rate Risk) (Detail) (Fair Value Hedging [Member], Designated as Hedging Instrument [Member], Interest Rate Contract [Member], USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]	'	'
Derivative [Line Items]	'	'
Amount of Gain or (Loss) Recognized in Income on Derivative	($17,000)	($11,000)
Amount of Gain or (Loss) Recognized in Income on Hedged Item	15,000	10,000
Income Statement Gain/(Loss) due to Hedge Ineffectiveness	($2,000)	($1,000)

Derivative_Financial_Instrumen7

Derivative Financial Instruments Derivative Financial Instruments (Summary Amounts Included In Consolidated Statement Of Income Related To Derivatives) (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Interest Rate Swaps and Caps [Member] | Other Income [Member]	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Derivative, Gain (Loss) on Derivative, Net	($677)	($297)
Mortgage Banking Derivatives [Member] | Mortgage Banking Revenue [Member]	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Derivative, Gain (Loss) on Derivative, Net	3,677	-670
Covered Call Options [Member] | Fees From Covered Call Options [Member]	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Derivative, Gain (Loss) on Derivative, Net	1,542	1,639
Foreign Exchange Contract [Member] | Other Income [Member]	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Derivative, Gain (Loss) on Derivative, Net	($1)	($146)

Derivative_Financial_Instrumen8

Derivative Financial Instruments Derivative Financial Instruments (Derivative Asset and Liability Balance Sheet Offsetting) (Detail) (USD $)	Mar. 31, 2014		Dec. 31, 2013		Mar. 31, 2013
In Thousands, unless otherwise specified
Derivative Assets	'		'		'
Gross Amounts Recognized	$37,239		$37,956		$46,653
Less: Amounts offset in the Statements of Financial Condition	0		0		0
Net amount presented in the Statements of Financial Condition	37,239		37,956		46,653
Offsetting Derivative Positions	-7,359		-8,826		-1,523
Securities Collateral Posted	0	[1]	0	[1]	0	[1]
Cash Collateral Posted	0		0		0
Net Credit Exposure	29,880		29,130		45,130
Derivative Liabilities	'		'		'
Gross Amounts Recognized	34,990		34,807		50,262
Less: Amounts offset in the Statements of Financial Condition	0		0		0
Net amount presented in the Statements of Financial Condition	34,990		34,807		50,262
Offsetting Derivative Positions	-7,359		-8,826		-1,523
Securities Collateral Posted	-27,631	[1]	-25,981	[1]	-43,361	[1]
Cash Collateral Posted	0		0		-2,445
Net Credit Exposure	$0		$0		$2,933
[1]	As of March 31, 2014 and December 31, 2013, the Company posted securities collateral of $37.1 million and $34.6 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 Derivative Financial Instruments (Narrative) (Detail) (USD $)

3 Months Ended

3 Months Ended

3 Months Ended

3 Months Ended

Mar. 31, 2014

Mar. 31, 2013

Dec. 31, 2013

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2013

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2013

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2013

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Jun. 30, 2013

Mar. 31, 2014

Mar. 31, 2014

Jun. 30, 2013

Interest Rate Cap [Member]

Interest Rate Cap [Member]

Interest Rate Contract [Member]

Forward Commitments to Sell Mortgage Loans [Member]

Interest Rate Lock Commitments [Member]

Foreign Exchange Contract [Member]

Call Options Written [Member]

Call Options Written [Member]

Call Options Written [Member]

Minimum [Member]

Maximum [Member]

Cash Flow Hedging [Member]

Cash Flow Hedging [Member]

Fair Value Hedging [Member]

Fair Value Hedging [Member]

Fair Value Hedging [Member]

Cash flow hedge of variable rate deposits [Member]

Interest Rate Cap Two Hundred Sixteen Million Five Hundred Thousand Notional August Two Thousand Sixteen Maturity [Member]

Interest Rate Cap Forty Three Million Five Hundred Thousand Notional August Two Thousand Sixteen Maturity [Member] [Member]

cash flow hedge of junior subordinated debentures [Member]

cash flow hedge of junior subordinated debentures [Member]

cash flow hedge of junior subordinated debentures [Member]

cash flow hedge of junior subordinated debentures [Member]

De-designated Hedge [Member]

Not Designated as Hedging Instrument [Member]

Not Designated as Hedging Instrument [Member]

derivative_instruments

derivative_instruments

derivative_instruments

Interest Rate Contract [Member]

Interest Rate Contract [Member]

Interest Rate Swap [Member]

Interest Rate Contract [Member]

Interest Rate Contract [Member]

Cash Flow Hedging [Member]

Cash Flow Hedging [Member]

Cash Flow Hedging [Member]

Cash Flow Hedging [Member]

Cash Flow Hedging [Member]

Cash Flow Hedging [Member]

Cash Flow Hedging [Member]

contracts

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]

Interest Rate Cap [Member]

Designated as Hedging Instrument [Member]

Designated as Hedging Instrument [Member]

Interest Rate Swap [Member]

Interest Rate Swap [Member]

Interest Rate Cap [Member]

Interest Rate Cap [Member]

derivative_instruments

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]

derivative_instruments

derivative_instruments

derivative_instruments

Derivative Instruments, Gain (Loss) [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of Interest Rate Derivatives Held

'

'

'

'

6

'

'

'

'

'

'

'

'

'

'

'

3

'

'

2

'

'

'

2

4

'

Notional Amount

'

'

'

$96,500,000

$620,000,000

$2,900,000,000

$445,000,000

$306,600,000

$1,800,000

'

'

'

'

'

'

'

$5,800,000

'

'

'

$216,500,000

$43,500,000

'

'

'

$90,000,000

Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

0

'

'

'

'

'

'

'

'

'

'

Amount reclassified from accumulated other comprehensive income to interest expense

1,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Income Statement Gain/(Loss) due to Hedge Ineffectiveness

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-2,000

-1,000

'

'

'

'

'

'

'

Fair value hedges recognized interest income

10,000

2,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Basis Amortization of Hedged item no longer in a Hedging Relationship

43,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative, Maturity Date

'

'

'

'

'

'

'

'

'

'

'

'

30-Apr-14

31-Jan-33

'

'

'

'

'

'

'

'

30-Sep-13

'

'

'

Loans Held-for-sale, Fair Value Disclosure

215,231,000

380,922,000

334,327,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative, Number of Instruments Held

'

'

'

'

'

'

'

'

'

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative, Net Liability Position, Aggregate Fair Value

26,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Security Owned and Pledged as Collateral, Fair Value

$37,100,000

'

$34,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Recovered_Sheet4

Fair Values Of Assets And Liabilities (Summary Of Balances Of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 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	$1,949,697	$2,176,290	$1,870,831	'
Trading account securities	1,068	497	1,036	'
Derivative assets	37,239	37,956	46,653	'
Derivative liabilities	34,990	34,807	50,262	'
US Treasury Securities [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Available-for-sale securities	340,178	336,095	217,645	'
U.S. Government Agencies Debt Securities [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Available-for-sale securities	828,275	895,688	973,715	'
Municipal Bonds [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Available-for-sale securities	175,300	152,716	110,259	'
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	39,772	36,386	32,324	30,770
Asset-backed Securities [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Available-for-sale securities	417,303	605,225	368,282	'
Equity Securities [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Available-for-sale securities	53,574	51,528	52,057	'
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	23,438	22,163	24,470	22,169
Fair Value, Measurements, Recurring [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Trading account securities	1,068	497	1,036	'
Mortgage loans held-for-sale	215,231	332,485	370,570	'
Mortgage servicing rights	8,719	8,946	7,344	'
Nonqualified deferred compensation assets	7,783	7,222	6,545	'
Derivative assets	51,529	48,221	52,436	'
Total	2,234,027	2,573,661	2,308,762	'
Derivative liabilities	37,797	37,264	54,745	'
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Available-for-sale securities	340,178	336,095	217,645	'
Fair Value, Measurements, Recurring [Member] | U.S. Government Agencies Debt Securities [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Available-for-sale securities	828,275	895,688	973,715	'
Fair Value, Measurements, Recurring [Member] | Municipal Bonds [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Available-for-sale securities	175,300	152,716	110,259	'
Fair Value, Measurements, Recurring [Member] | Corporate Notes [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Available-for-sale securities	135,067	135,038	148,873	'
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	417,303	605,225	368,282	'
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	53,574	51,528	52,057	'
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Trading account securities	'	'	'	'
Mortgage loans held-for-sale	'	'	'	'
Mortgage servicing rights	'	'	'	'
Nonqualified deferred compensation assets	'	'	'	'
Derivative assets	'	'	'	'
Total	'	'	'	'
Derivative liabilities	'	'	'	'
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | US Treasury Securities [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Available-for-sale securities	'	'	'	'
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | U.S. Government Agencies Debt Securities [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Available-for-sale securities	'	'	'	'
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Municipal Bonds [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Available-for-sale securities	'	'	'	'
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Corporate Notes [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Available-for-sale securities	'	'	'	'
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Asset-backed Securities [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Available-for-sale securities	'	'	'	'
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Equity Securities [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Available-for-sale securities	'	'	'	'
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Trading account securities	1,068	497	1,036	'
Mortgage loans held-for-sale	215,231	332,485	370,570	'
Mortgage servicing rights	0	0	0	'
Nonqualified deferred compensation assets	7,783	7,222	6,545	'
Derivative assets	51,529	48,221	52,436	'
Total	2,162,098	2,506,166	2,244,624	'
Derivative liabilities	37,797	37,264	54,745	'
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | US Treasury Securities [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Available-for-sale securities	340,178	336,095	217,645	'
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | U.S. Government Agencies Debt Securities [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Available-for-sale securities	828,275	895,688	973,715	'
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Municipal Bonds [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Available-for-sale securities	135,528	116,330	77,935	'
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Corporate Notes [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Available-for-sale securities	135,067	135,038	148,873	'
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Asset-backed Securities [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Available-for-sale securities	417,303	605,225	368,282	'
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Equity Securities [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Available-for-sale securities	30,136	29,365	27,587	'
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	0	'
Mortgage loans held-for-sale	0	0	0	'
Mortgage servicing rights	'	8,946	7,344	'
Nonqualified deferred compensation assets	0	0	0	'
Derivative assets	0	0	0	'
Total	71,929	67,495	64,138	'
Derivative liabilities	0	0	0	'
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | US Treasury Securities [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Available-for-sale securities	0	0	0	'
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | U.S. Government Agencies Debt Securities [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Available-for-sale securities	0	0	0	'
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Municipal Bonds [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Available-for-sale securities	'	36,386	32,324	'
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Corporate Notes [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Available-for-sale securities	0	0	0	'
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Asset-backed Securities [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Available-for-sale securities	0	0	0	'
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Equity Securities [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Available-for-sale securities	'	$22,163	$24,470	'

Recovered_Sheet5

Fair Values Of Assets And Liabilities (Summary Of Changes In Level 3 Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014		Mar. 31, 2013
Mortgage Servicing Rights [Member]	'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'
Beginning Balance	$8,946		$6,750
Total net gains (losses) included in Net income	-227	[1]	594	[1]
Total net gains (losses) included in Other comprehensive income	'		'
Purchases	'		'
issuances	'		'
Sales	'		'
Settlements	'		'
Net transfers into Level 3	'		'
Ending Balance	8,719		7,344
Municipal Bonds [Member]	'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'
Beginning Balance	36,386		30,770
Total net gains (losses) included in Net income	'		'
Total net gains (losses) included in Other comprehensive income	147		-12
Purchases	3,360		1,687
issuances	'		'
Sales	'		'
Settlements	-121		-121
Net transfers into Level 3	'		'
Ending Balance	39,772		32,324
Equity Securities [Member]	'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'
Beginning Balance	22,163		22,169
Total net gains (losses) included in Net income	'		'
Total net gains (losses) included in Other comprehensive income	1,275		2,301
Purchases	'		'
issuances	'		'
Sales	'		'
Settlements	'		'
Net transfers into Level 3	'		'
Ending Balance	$23,438		$24,470
[1]	Changes in the balance of mortgage servicing rights are recorded as a component of mortgage banking revenue in non-interest income.

Fair_Values_Of_Assets_And_Liab2

Fair Values Of Assets And Liabilities (Summary Of Assets Measured At Fair Value On A Nonrecurring Basis) (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'
Fair Value Losses Recognized, Impaired loansbcollateral based	$7,564
Fair Value Losses Recognized, Other real estate owned	6,172	[1]
Fair Value Losses Recognized, Total	13,736
Fair Value, Measurements, Nonrecurring [Member]	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'
Impaired loans - collateral based	68,355
Other real estate owned	129,279
Total	197,634
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member]	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'
Impaired loans - collateral based	0
Other real estate owned	0
Total	0
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member]	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'
Impaired loans - collateral based	0
Other real estate owned	0
Total	0
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member]	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'
Impaired loans - collateral based	68,355
Other real estate owned	129,279
Total	$197,634
[1]	Fair value losses recognized on other real estate owned include valuation adjustments and charge-offs during the respective period.

Fair_Value_Of_Assets_and_Liabi

Fair Value Of Assets and Liabilities (Schedule Of Valuation Techniques And Significant Unobservable Inputs Used To Measure Both Recurring And Non-Recurring) (Detail) (USD $)

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2013

Dec. 31, 2012

Mar. 31, 2014

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2013

Dec. 31, 2012

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2013

Dec. 31, 2012

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

In Thousands, unless otherwise specified

Fair Value, Measurements, Nonrecurring [Member]

Level 3 [Member]

Impaired Loans [Member]

Other Real Estate Owned [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]

Minimum [Member]

Minimum [Member]

Maximum [Member]

Maximum [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]

Mortgage Servicing Rights [Member]

Mortgage Servicing Rights Discount Rate Input [Member]

Mortgage Servicing Rights Prepayment Rate Input [Member]

Fair Value, Measurements, Nonrecurring [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Other Real Estate Owned [Member]

Equity Securities [Member]

Other Real Estate Owned [Member]

Equity Securities [Member]

Level 3 [Member]

Minimum [Member]

Maximum [Member]

Level 3 [Member]

Level 3 [Member]

Fair Value, Measurements, Nonrecurring [Member]

Fair Value, Measurements, Nonrecurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Fair Value, Measurements, Recurring [Member]

Level 3 [Member]

Level 3 [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Nonrecurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Nonrecurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

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

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value

'

'

'

'

$39,772

$36,386

$32,324

$30,770

'

$23,438

$22,163

$24,470

$22,169

'

'

'

'

'

$8,719

$8,946

$7,344

$6,750

'

'

'

'

'

Impaired loans - collateral based

68,355

68,355

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Other real estate owned

$129,279

$129,279

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Valuation Methodology

'

'

'Appraisal value

'Appraisal value

'

'

'

'

'Bond pricing

'

'

'

'

'Discounted cash flows

'

'

'

'

'

'

'

'

'Discounted cash flows

'

'

'

'

Significant Unobservable Input

'

'

'

'Property specific impairment adjustment

'

'

'

'

'Equivalent rating

'

'

'

'

'Discount rate

'

'

'

'

'

'

'

'

'

'

'

'Discount rate

'Constant prepayment rate (CPR)

Level 3 Fair Value Measurements Range of Inputs

'

'

'

'0%-84%

'

'

'

'

'BBB-AA+

'

'

'

'

'1.44%-2.33%

'

'

'

'

'

'

'

'

'

'

'

'9.5%-13%

'10%-15%

Weighted Average of Inputs

'

'

'

4.65%

'

'

'

'

'

'

'

'

'

1.93%

'

'

'

'

'

'

'

'

'

'

'

9.66%

11.95%

Impact to valuation from an increased or higher input value

'

'

'

'Decrease

'

'

'

'

'Increase

'

'

'

'

'Decrease

'

'

'

'

'

'

'

'

'

'

'

'Decrease

'Decrease

Fair Value Inputs, Discount Rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.00%

1.44%

84.00%

2.33%

'

'

'

'

'

9.50%

13.00%

'

'

Fair Value Inputs, Prepayment Rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

10.00%

15.00%

'

'

Recovered_Sheet6

Fair Value Of Assets And Liabilities (Summary Of Carrying Amounts And Estimated Fair Values Of Financial Instruments) (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Interest bearing deposits with banks	$540,964	$495,574	$685,302	'
Available-for-sale securities	1,949,697	2,176,290	1,870,831	'
Trading account securities	1,068	497	1,036	'
Brokerage customer receivables	26,884	30,953	25,614	'
Federal Home Loan Bank and Federal Reserve Bank stock, at cost	78,524	79,261	76,601	'
FDIC indemnification asset	60,298	85,672	170,696	208,160
Federal Home Loan Bank advances	387,672	417,762	414,032	'
Subordinated notes	0	0	15,000	'
Other borrowings	230,904	254,740	256,244	'
Junior subordinated debentures	249,493	249,493	249,493	'
Carrying Value [Member]	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Cash and cash equivalents	342,738	263,864	213,201	'
Interest bearing deposits with banks	540,964	495,574	685,302	'
Available-for-sale securities	1,949,697	2,176,290	1,870,831	'
Trading account securities	1,068	497	1,036	'
Brokerage customer receivables	26,884	30,953	25,614	'
Federal Home Loan Bank and Federal Reserve Bank stock, at cost	78,524	79,261	76,601	'
Mortgage loans held-for-sale, at fair value	215,231	332,485	370,570	'
Mortgage loans held-for-sale, at lower of cost or market	0	1,842	10,352	'
Total loans	13,445,638	13,243,033	12,418,973	'
Mortgage servicing rights	8,719	8,946	7,344	'
Nonqualified deferred compensation assets	7,783	7,222	6,545	'
Derivative assets	51,529	48,221	52,436	'
FDIC indemnification asset	60,298	85,672	170,696	'
Accrued interest receivable and other	169,580	163,732	156,825	'
Total financial assets	16,898,653	16,937,592	16,066,326	'
Non-maturity deposits	10,944,521	10,442,077	9,293,104	'
Deposits with stated maturities	4,184,524	4,226,712	4,669,653	'
Notes payable	182	364	31,911	'
Federal Home Loan Bank advances	387,672	417,762	414,032	'
Subordinated notes	0	0	15,000	'
Other borrowings	230,904	254,740	256,244	'
Junior subordinated debentures	249,493	249,493	249,493	'
Derivative liabilities	37,797	37,264	54,745	'
Interest Payable, Current	7,218	8,556	11,520	'
Total financial liabilities	16,042,311	15,636,968	14,995,702	'
Estimate of Fair Value Measurement [Member]	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Cash and cash equivalents	342,738	263,864	213,201	'
Interest bearing deposits with banks	540,964	495,574	685,302	'
Available-for-sale securities	1,949,697	2,176,290	1,870,831	'
Trading account securities	1,068	497	1,036	'
Brokerage customer receivables	26,884	30,953	25,614	'
Federal Home Loan Bank and Federal Reserve Bank stock, at cost	78,524	79,261	76,601	'
Mortgage loans held-for-sale, at fair value	215,231	332,485	370,570	'
Mortgage loans held-for-sale, at lower of cost or market	0	1,857	10,458	'
Total loans	14,078,788	13,867,255	13,125,643	'
Mortgage servicing rights	8,719	8,946	7,344	'
Nonqualified deferred compensation assets	7,783	7,222	6,545	'
Derivative assets	51,529	48,221	52,436	'
FDIC indemnification asset	60,298	85,672	170,696	'
Accrued interest receivable and other	169,580	163,732	156,825	'
Total financial assets	17,531,803	17,561,829	16,773,102	'
Non-maturity deposits	10,944,521	10,442,077	9,293,104	'
Deposits with stated maturities	4,197,918	4,242,172	4,701,049	'
Notes payable	182	364	31,911	'
Federal Home Loan Bank advances	393,145	422,750	425,103	'
Subordinated notes	0	0	15,000	'
Other borrowings	230,904	254,740	256,244	'
Junior subordinated debentures	250,578	250,672	250,470	'
Derivative liabilities	37,797	37,264	54,745	'
Interest Payable, Current	7,218	8,556	11,520	'
Total financial liabilities	$16,062,263	$15,658,595	$15,039,146	'

Fair_Values_Of_Assets_And_Liab3

Fair Values Of Assets And Liabilities (Narrative) (Detail) (USD $)

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2013

Dec. 31, 2012

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2013

Dec. 31, 2012

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2013

Mar. 31, 2014

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2013

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2013

Mar. 31, 2014

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2013

Dec. 31, 2012

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Municipal Bonds [Member]

Municipal Bonds [Member]

Municipal Bonds [Member]

Municipal Bonds [Member]

Equity Securities [Member]

Equity Securities [Member]

Equity Securities [Member]

Equity Securities [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [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]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Estimate of Fair Value Measurement [Member]

Estimate of Fair Value Measurement [Member]

Estimate of Fair Value Measurement [Member]

Valued Using Discounted Cash Flow Model [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]

Mortgage Servicing Rights [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]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Nonrecurring [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]

Equity Securities [Member]

Equity Securities [Member]

Equity Securities [Member]

Equity Securities [Member]

Fair Value, Measurements, Nonrecurring [Member]

Fair Value, Measurements, Nonrecurring [Member]

Fair Value, Measurements, Nonrecurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Minimum [Member]

Maximum [Member]

Weighted Average [Member]

Minimum [Member]

Maximum [Member]

Minimum [Member]

Maximum [Member]

Weighted Average [Member]

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

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value

'

'

'

$39,772,000

$36,386,000

$32,324,000

$30,770,000

$23,438,000

$22,163,000

$24,470,000

$22,169,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$8,719,000

$8,946,000

$7,344,000

$6,750,000

'

'

'

Fair Value Inputs, Discount Rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1.44%

2.33%

1.93%

'

'

0.00%

84.00%

'

'

'

'

'

'

'

'

9.50%

13.00%

9.66%

Fair Value Inputs, Prepayment Rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

10.00%

15.00%

11.95%

Remaining contractual principal balance outstanding, mortgage loans held-for-sale

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

199,300,000

314,900,000

366,800,000

'

'

'

'

'

'

'

'

Mortgage loans held-for-sale

'

'

'

'

'

'

'

'

'

'

'

215,231,000

332,485,000

370,570,000

'

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Mortgages held for sale, past due 90 days and accruing

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total impaired loans

142,977,000

[1]

162,229,000

[1]

203,554,000

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

74,600,000

'

'

'

'

'

'

'

Impaired Loans Fair Value Disclosure

'

'

'

'

'

'

'

'

'

'

'

'

'

'

68,355,000

'

'

'

'

'

'

'

68,355,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Other real estate owned

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$129,279,000

'

'

'

'

'

'

'

$129,279,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Level Three Fair Value Measurements Weighted Average Percentage

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1.93%

'

'

'

'

4.65%

'

'

'

'

'

'

'

'

'

'

'

'

'

[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.

StockBased_Compensation_Plans_1

Stock-Based Compensation Plans (Weighted Average Assumptions Used To Determine The Options Fair Value) (Detail)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Share-based Compensation [Abstract]	'	'
Expected dividend yield	0.44%	0.50%
Expected volatility	30.80%	59.70%
Risk-free rate	0.70%	0.70%
Expected option life (in years)	'4 years 6 months	'4 years 6 months

StockBased_Compensation_Plans_2

Stock-Based Compensation Plans (Summary Of Stock Option Activity) (Detail) (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014		Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]	'		'
Common Shares, Outstanding at beginning of the period	1,524,672		1,745,427
Common Shares, Granted	358,440		219,695
Common Shares, Exercised	-77,311		-8,336
Common Shares, Forfeited or canceled	-18,898		-6,330
Common Shares, Outstanding at end of the period	1,786,903		1,950,456
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]	'		'
Weighted Average Strike Price, Outstanding at beginning of period	$42		$42.31
Weighted Average Strike Price, Granted	$46.86		$37.85
Weighted Average Strike Price, Exercised	$34.79		$24.98
Weighted Average Strike Price, Forfeited or canceled	$45.56		$41.49
Weighted Average Strike Price, Outstanding at end of period	$43.25		$41.89
Stock Options, Exercisable	1,166,309		1,437,240
Stock Options, Weighted Average Strike Price, Exercisable	$43.96		$44.64
Stock Options, Remaining Contractual Term, Outstanding, Years	'3 years 8 months 12 days	[1]	'3 years 3 months 18 days	[1]
Stock Options, Remaining Contractual Term, Exercisable, Years	'2 years 4 months 24 days	[1]	'2 years 3 months 18 days	[1]
Stock Options, Intrinsic Value, Outstanding	$12,834	[2]	$3,975	[2]
Stock Options, Intrinsic Value, Exercisable	$8,655	[2]	$2,318	[2]
[1]	(1)Represents the remaining weighted average contractual life in years.
[2]	Aggregate intrinsic value represents the total pre-tax intrinsic value (i.e., the difference between the Company's stock price on the last trading day of the quarter 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 quarter. Options with exercise prices above the stock price on the last trading day of the quarter are excluded from the calculation of intrinsic value. The intrinsic value will change based on the fair market value of the Company's stock.

StockBased_Compensation_Plans_3

Stock-Based Compensation Plans (Summary Of Plans' Restricted Share And Performance-Vested Stock Award Activity) (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012
Restricted Stock [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]	'	'	'	'
Shares, Beginning of the Period	181,522	314,226	'	'
Shares, Granted	2,775	0	'	'
Shares, Vested and issued	-24,900	-109,725	'	'
Shares, Forfeited	-451	-674	'	'
Shares, Outstanding, End of the Period	158,946	203,827	'	'
Shares, Vested, but not issuable	85,000	85,000	'	'
Weighted Average Grant-Date Fair Value	$44.95	$41.40	$43.39	$37.99
Weighted Average Grant-Date Fair Value, Granted	$46.86	$0	'	'
Weighted Average Grant-Date Fair Value, Vested and issued	$33.81	$31.67	'	'
Weighted Average Grant-Date Fair Value, Forfeited	$44.29	$32.10	'	'
Weighted Average Grant-Date Fair Value, Vested, but not issuable	$51.88	$51.88	'	'
Performance Shares [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]	'	'	'	'
Shares, Beginning of the Period	307,512	214,565	'	'
Shares, Granted	91,501	102,160	'	'
Shares, Vested and issued	-15,944	0	'	'
Shares, Forfeited	-81,551	-2,359	'	'
Shares, Outstanding, End of the Period	301,518	314,366	'	'
Weighted Average Grant-Date Fair Value	$38.12	$33.95	$34.01	$32.08
Weighted Average Grant-Date Fair Value, Granted	$46.86	$37.84	'	'
Weighted Average Grant-Date Fair Value, Vested and issued	$33.25	$0	'	'
Weighted Average Grant-Date Fair Value, Forfeited	$33.38	$33.02	'	'

StockBased_Compensation_Plans_4

Stock-Based Compensation Plans (Narrative) (Detail) (USD $)

3 Months Ended

3 Months Ended

12 Months Ended

Mar. 31, 2014

Mar. 31, 2013

Mar. 31, 2014

31-May-11

31-May-09

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Dec. 31, 2013

Dec. 31, 2013

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]

Restricted Stock [Member]

Restricted Stock [Member]

Ltip Awards [Member]

Ltip Awards [Member]

Ltip Awards [Member]

LTIP Performance-Based Stock Awards [Member]

LTIP Performance-Based Cash Awards [Member]

Minimum [Member]

Maximum [Member]

Minimum [Member]

Maximum [Member]

Minimum [Member]

Maximum [Member]

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

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Shares approved for issuance

'

'

500,000

'

'

'

'

'

'

'

'

'

'

'

'

Shares additionally approved for issuance

'

'

'

2,860,000

325,000

'

'

'

'

'

'

'

'

'

'

Shares available for future grants

'

'

361,834

'

'

'

'

'

'

'

'

'

'

'

'

Award vesting period, maximum, years

'

'

'

'

'

'3 years

'5 years

'

'1 year

'5 years

'3 years

'

'

'

'

Share based payment award options term

'

'

'7 years

'

'

'

'

'10 years

'

'

'7 years

'

'

'

'

Percentage of performance based award payouts

'

'

'

'

'

'

'

'

'

'

'

0.00%

200.00%

'

'

Allocated Share-based Compensation Expense

$3,800,000

$2,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Deferred Compensation Arrangement with Individual, Compensation Expense

'

'

'

'

'

'

'

'

'

'

'

'

'

2,100,000

3,000,000

Weighted average grant date fair value per share of options granted

$11.96

$17.59

'

'

'

'

'

'

'

'

'

'

'

'

'

Aggregate intrinsic value of options exercised

$911,000

$102,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Recovered_Sheet7

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

Recovered_Sheet8

Shareholders' Equity And Earnings Per Share (Components Of Other Comprehensive Income (Loss)) (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Activity Accumulated Other Comprehensive Income [Roll Forward]	'	'
Balance at beginning of period	($63,036)	$7,711
Other comprehensive income (loss) during the period, net of tax, before reclassifications	5,966	-9,554
Amount reclassified from accumulated other comprehensive income (loss), net of tax	317	776
Total other comprehensive income (loss)	6,283	-8,778
Balance at end of period	-56,753	-1,067
Accumulated Unrealized (Losses) Gains on Securities	'	'
Activity Accumulated Other Comprehensive Income [Roll Forward]	'	'
Balance at beginning of period	-53,665	6,710
Other comprehensive income (loss) during the period, net of tax, before reclassifications	13,722	-4,649
Amount reclassified from accumulated other comprehensive income (loss), net of tax	20	-151
Total other comprehensive income (loss)	13,742	-4,800
Balance at end of period	-39,923	1,910
Accumulated Unrealized Losses on Derivative Instruments	'	'
Activity Accumulated Other Comprehensive Income [Roll Forward]	'	'
Balance at beginning of period	-2,462	-5,292
Other comprehensive income (loss) during the period, net of tax, before reclassifications	-356	-39
Amount reclassified from accumulated other comprehensive income (loss), net of tax	297	927
Total other comprehensive income (loss)	-59	888
Balance at end of period	-2,521	-4,404
Accumulated Foreign Currency Translation Adjustment	'	'
Activity Accumulated Other Comprehensive Income [Roll Forward]	'	'
Balance at beginning of period	-6,909	6,293
Other comprehensive income (loss) during the period, net of tax, before reclassifications	-7,400	-4,866
Amount reclassified from accumulated other comprehensive income (loss), net of tax	0	0
Total other comprehensive income (loss)	-7,400	-4,866
Balance at end of period	($14,309)	$1,427

Shareholders_Equity_and_Earnin2

Shareholders' Equity and Earnings Per Share Shareholders' Equity And Earnings Per Share (Other Comprehensive Income Reclassified from AOCI) (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]	'	'
(Losses) gains on available-for-sale securities, net	($33)	$251
Interest on junior subordinated debentures	2,004	3,119
Income before taxes	56,340	52,286
Income tax expense	-21,840	-20,234
Net income	34,500	32,052
Accumulated Unrealized (Losses) Gains on Securities | Reclassification Out of Accumulated Other Comprehensive Income [Member]	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]	'	'
(Losses) gains on available-for-sale securities, net	-33	251
Income before taxes	-33	251
Income tax expense	13	-100
Net income	-20	151
Accumulated Unrealized Losses on Derivative Instruments | Reclassification Out of Accumulated Other Comprehensive Income [Member]	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]	'	'
Interest on junior subordinated debentures	493	1,539
Income before taxes	-493	-1,539
Income tax expense	196	612
Net income	($297)	($927)

Recovered_Sheet9

Shareholders' Equity And Earnings Per Share (Computation Of Basic And Diluted Earnings Per Common Share) (Detail) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Shareholders' Equity and Earnings Per Share Disclosure [Abstract]	'	'
Net income	$34,500	$32,052
Less: Preferred stock dividends and discount accretion	1,581	2,616
Net income applicable to common shares	32,919	29,436
Add: Dividends on convertible preferred stock, if dilutive	1,581	2,581
Net income applicable to common shares-Diluted	$34,500	$32,017
Weighted average common shares outstanding	46,195	36,976
Effect of dilutive potential common shares	'	'
Common stock equivalents	1,434	7,443
Convertible preferred stock, if dilutive	3,075	5,020
Total dilutive potential common shares	4,509	12,463
Average common shares and dilutive common shares	50,704	49,439
Net income per common share-Basic	$0.71	$0.80
Net income per common share-Diluted	$0.68	$0.65

Shareholders_Equity_And_Earnin3

Shareholders' Equity And Earnings Per Share (Narrative) (Detail) (USD $)

0 Months Ended

1 Months Ended

3 Months Ended

12 Months Ended

1 Months Ended

1 Months Ended

3 Months Ended

0 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

0 Months Ended

12 Months Ended

0 Months Ended

Dec. 19, 2008

Jan. 31, 2014

Feb. 28, 2013

Mar. 31, 2012

Mar. 31, 2014

Mar. 31, 2013

Dec. 31, 2010

Dec. 31, 2013

Jul. 19, 2013

Dec. 07, 2010

Jul. 19, 2013

Aug. 31, 2008

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2013

Mar. 31, 2012

Dec. 31, 2013

Mar. 31, 2014

Mar. 31, 2013

Dec. 15, 2013

Dec. 31, 2013

Dec. 31, 2010

Mar. 31, 2014

Dec. 31, 2013

Dec. 31, 2010

Dec. 15, 2013

Dec. 07, 2010

Mar. 15, 2011

Dec. 31, 2010

Dec. 07, 2010

1-May-13

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]

Equity Component

Equity Component

Equity Component

Junior Subordinated Debt [Member]

Junior Subordinated Debt [Member]

Junior Subordinated Debt [Member]

Junior Subordinated Debt [Member]

Junior Subordinated Debt [Member]

Junior Subordinated Debt [Member]

Junior Subordinated Debt [Member]

Junior Subordinated Debt [Member]

First Lansing Bancorp, Inc. [Member]

Debt [Member]

Debt [Member]

Debt [Member]

Temporary Equity [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Amount Of Tangible Equity Units Sold

'

'

'

'

'

'

'

'

'

4,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Rate on tangible equity units

'

'

'

'

'

'

'

'

'

7.50%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Tangible equity unit public offering price per unit

'

'

'

'

'

'

'

'

'

$50

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net proceeds on sale of tangible equity units

'

'

'

'

'

'

$222,700,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Maturity Date

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

15-Dec-13

15-Dec-13

'

15-Dec-13

'

'

'

15-Dec-13

'

'

Debt Instrument, Frequency of Periodic Payment

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'quarterly

'quarterly

'

'

'

'quarterly

'

'

Percentage of fair value of debt component quarterly cash payments

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

7.50%

'

'

'

'

'

'

Discount rate on debt component

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

9.50%

'

'

'

'

Risk-free rate

'

'

'

'

0.70%

0.70%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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, years

'

'

'

'

'4 years 6 months

'4 years 6 months

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'3 years 7 days

'

'

'

'

'

'

'

'

'

Junior subordinated amortizing note, initial principal amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

9.728182

'

Contractual rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

9.50%

'

'

'

9.50%

'

Quarterly installments on amortizing note

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.989583

0.9375

'

'

Settlement rate, shares

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1.3333

'

'

'

'

'

'

'

'

'

'

'

Number Of Consecutive Trading Days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'20

'

'

'

'

'

'

'

'

'

'

Amount Per Share Reclassified From Surplus To Common Stock

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$1

'

'

'

'

'

'

'

'

'

'

'

Preferred stock, shares issued

'

'

'

'

'

'

'

'

'

'

'

50,000

0

0

50,000

126,500

126,477

126,477

126,500

'

'

'

'

'

'

'

'

'

'

'

'

Preferred stock, liquidation value per share

'

'

'

'

'

'

'

'

'

'

'

$1,000

$1,000

$1,000

$1,000

$1,000

$1,000

$1,000

$1,000

'

'

'

'

'

'

'

'

'

'

'

'

Preferred stock, value

'

'

'

'

'

'

'

'

'

'

'

$50,000,000

$0

$0

$49,941,000

$126,500,000

$126,477,000

$126,477,000

$126,500,000

'

'

'

'

'

'

'

'

'

'

'

'

Preferred stock, dividend rate, percentage

'

'

'

'

'

'

'

'

'

'

'

8.00%

'

'

'

5.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Convertible preferred stock conversion rate of common stock to Series A preferred stock

'

'

'

'

'

'

'

'

'

'

'

38.88

'

'

'

24.3132

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Preferred Stock, Shares Converted

'

'

'

'

'

'

'

'

'

'

50,000

'

'

'

'

'

23

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock Issued During Period, Shares, Conversion of Convertible Securities

'

'

'

'

'

'

'

'

'

'

1,944,000

'

'

'

'

'

558

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock, no par value

'

'

'

'

'

'

'

'

$0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Class of Warrant or Right, Number of Securities Called by Warrants or Rights

1,643,295

'

'

'

1,643,295

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Investment Warrants, Exercise Price

$22.82

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Warrant Termination Period

'10 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Warrants Holders Common Stock Purchase Price Per Share

'

'

'

'

$30.50

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Warrants outstanding

'

'

'

19,000

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Warrants Exercised

'

'

1,000

18,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock, shares issued

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

648,286

Cash dividends declared per common share

'

$0.10

'

'

$0.10

$0.09

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common Stock Dividends Per Share Declared Annualized

'

$0.40

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Dividends Payable, Date to be Paid

'

20-Feb-14

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Dividends Payable, Date of Record

'

6-Feb-14

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Subsequent_Events_Detail

Subsequent Events (Detail) (Subsequent Event [Member], USD $)	0 Months Ended
In Millions, unless otherwise specified	Apr. 28, 2014	Apr. 08, 2014	Apr. 07, 2014	Apr. 07, 2014
	Policy Billing Services Inc. & Equity Premium Finance Inc. [Member]	Talmer Bank & Trust [Member]	THE National Bank [Member]	Performing Financing Receivable [Member]
		locations		THE National Bank [Member]
Subsequent Event [Line Items]	'	'	'	'
Business Acquisition, Effective Date of Acquisition	28-Apr-14	8-Apr-14	7-Apr-14	'
Business Acquisition, Percentage of Voting Interests Acquired	100.00%	'	'	'
Number of Affiliated Companies Acquired	2	'	'	'
Number of locations	'	11	'	'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits	'	$360	$40	'
Business Combination, Acquired Receivables, Fair Value	'	'	'	$90