Wintrust Financial (WTFC) 10-Q 7 Nov 14 2014 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2014	Oct. 31, 2014
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Sep-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q3	'
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	'	46,715,099

Consolidated_Statements_Of_Con

Consolidated Statements Of Condition (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
In Thousands, unless otherwise specified
Assets	'	'	'
Cash and due from banks	$260,694	$253,408	$322,866
Federal funds sold and securities purchased under resale agreements	26,722	10,456	7,771
Interest bearing deposits with banks	620,370	495,574	681,834
Available-for-sale securities, at fair value	1,782,648	2,176,290	1,781,883
Trading account securities	6,015	497	259
Federal Home Loan Bank and Federal Reserve Bank stock	80,951	79,261	76,755
Brokerage customer receivables	26,624	30,953	29,253
Mortgage loans held-for-sale	363,303	334,327	334,345
Loans, net of unearned income, excluding covered loans	14,052,059	12,896,602	12,581,039
Covered loans	254,605	346,431	415,988
Total loans	14,306,664	13,243,033	12,997,027
Less: Allowance for loan losses	91,019	96,922	107,188
Less: Allowance for covered loan losses	2,655	10,092	12,924
Net loans	14,212,990	13,136,019	12,876,915
Premises and equipment, net	555,241	531,947	517,942
FDIC indemnification asset	27,359	85,672	100,313
Accrued interest receivable and other assets	494,213	569,619	576,121
Trade date securities receivable	285,627	0	0
Goodwill	406,604	374,547	357,309
Other intangible assets	19,984	19,213	18,982
Total assets	19,169,345	18,097,783	17,682,548
Deposits:	'	'	'
Non-interest bearing	3,253,477	2,721,771	2,622,518
Interest bearing	12,811,769	11,947,018	12,024,928
Total deposits	16,065,246	14,668,789	14,647,446
Federal Home Loan Bank advances	347,500	417,762	387,852
Other borrowings	51,483	255,104	248,416
Subordinated notes	140,000	0	10,000
Junior subordinated debentures	249,493	249,493	249,493
Trade date securities payable	0	303,088	0
Accrued interest payable and other liabilities	287,115	302,958	265,775
Total liabilities	17,140,837	16,197,194	15,808,982
Preferred stock, no par value; 20,000,000 shares authorized:	'	'	'
Series C - $1,000 liquidation value; 126,467 shares issued and outstanding at September 30, 2014, 126,477 shares issued and outstanding at December 31, 2013, and 126,500 shares issued and outstanding at September 30, 2013	126,467	126,477	126,500
Common stock, no par value; $1.00 stated value; 100,000,000 shares authorized at September 30, 2014, December 31, 2013, and September 30, 2013; 46,766,420 shares issued at September 30, 2014, 46,181,588 shares issued at December 31, 2013, and 39,992,300 shares issued at September 30, 2013	46,766	46,181	39,992
Surplus	1,129,975	1,117,032	1,118,550
Treasury stock, at cost, 75,373 shares at September 30, 2014, 65,005 shares at December 31, 2013, and 261,257 shares at September 30, 2013	-3,519	-3,000	-8,290
Retained earnings	771,519	676,935	643,228
Accumulated other comprehensive loss	-42,700	-63,036	-46,414
Total shareholders' equity	2,028,508	1,900,589	1,873,566
Total liabilities and shareholders' equity	$19,169,345	$18,097,783	$17,682,548

Consolidated_Statements_Of_Con1

Consolidated Statements Of Condition (Parenthetical) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
				Series C - $1,000 liquidation value; 126,467 shares issued and outstanding at September 30, 2014, 126,477 shares issued and outstanding at December 31, 2013, and 126,500 shares issued and outstanding at September 30, 2013	Series C - $1,000 liquidation value; 126,467 shares issued and outstanding at September 30, 2014, 126,477 shares issued and outstanding at December 31, 2013, and 126,500 shares issued and outstanding at September 30, 2013	Series C - $1,000 liquidation value; 126,467 shares issued and outstanding at September 30, 2014, 126,477 shares issued and outstanding at December 31, 2013, and 126,500 shares issued and outstanding at September 30, 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
Preferred stock, shares outstanding	'	'	'	126,467	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	46,766,420	46,181,588	39,992,300	'	'	'
Treasury stock, shares	75,373	65,005	261,257	'	'	'

Consolidated_Statements_Of_Inc

Consolidated Statements Of Income (Unaudited) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Interest income	'	'	'	'
Interest and fees on loans	$156,534	$150,810	$455,548	$438,907
Interest bearing deposits with banks	409	229	977	1,209
Federal funds sold and securities purchased under resale agreements	12	4	22	23
Available-for-sale securities	12,767	9,224	39,190	27,335
Trading account securities	20	14	34	27
Federal Home Loan Bank and Federal Reserve Bank stock	733	687	2,171	2,064
Brokerage customer receivables	201	200	610	562
Total interest income	170,676	161,168	498,552	470,127
Interest expense	'	'	'	'
Interest on deposits	12,298	12,524	35,980	40,703
Interest on Federal Home Loan Bank advances	2,641	2,729	7,989	8,314
Interest on other borrowings	200	910	1,460	3,196
Interest on subordinated notes	1,776	40	2,130	151
Interest on junior subordinated debentures	2,091	3,183	6,137	9,444
Total interest expense	19,006	19,386	53,696	61,808
Net interest income	151,670	141,782	444,856	408,319
Provision for credit losses	5,864	11,114	14,404	42,183
Net interest income after provision for credit losses	145,806	130,668	430,452	366,136
Non-interest income	'	'	'	'
Wealth management	17,659	16,057	52,694	46,777
Mortgage banking	26,691	25,682	66,923	87,561
Service charges on deposit accounts	6,084	5,308	17,118	15,136
(Losses) gains on available-for-sale securities, net	-153	75	-522	328
Fees from covered call options	2,107	285	4,893	2,917
Trading gains (losses), net	293	-1,655	-1,102	1,170
Other	5,271	8,910	17,579	22,147
Total non-interest income	57,952	54,662	157,583	176,036
Non-interest expense	'	'	'	'
Salaries and employee benefits	85,976	78,007	247,873	234,745
Equipment	7,570	6,593	22,196	19,190
Occupancy, net	10,446	9,079	31,289	26,639
Data processing	4,765	4,884	14,023	13,841
Advertising and marketing	3,528	2,772	9,902	7,534
Professional fees	4,035	3,378	11,535	10,790
Amortization of other intangible assets	1,202	1,154	3,521	3,438
FDIC insurance	3,211	3,245	9,358	9,692
OREO expense, net	581	2,499	7,047	3,163
Other	17,186	15,637	46,662	46,522
Total non-interest expense	138,500	127,248	403,406	375,554
Income before taxes	65,258	58,082	184,629	166,618
Income tax expense	25,034	22,519	71,364	64,696
Net income	40,224	35,563	113,265	101,922
Preferred stock dividends and discount accretion	1,581	1,581	4,743	6,814
Net income applicable to common shares	$38,643	$33,982	$108,522	$95,108
Net income per common share-Basic (in usd per share)	$0.83	$0.86	$2.34	$2.51
Net income per common share-Diluted (in usd per share)	$0.79	$0.71	$2.23	$2.05
Cash dividends declared per common share	$0.10	$0.09	$0.30	$0.18
Weighted average common shares outstanding	46,639	39,331	46,453	37,939
Dilutive potential common shares	4,241	10,823	4,349	11,763
Average common shares and dilutive common shares	50,880	50,154	50,802	49,702

Consolidated_Statements_Of_Com

Consolidated Statements Of Comprehensive Income (Unaudited) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]	'	'	'	'
Net income	$40,224	$35,563	$113,265	$101,922
Unrealized gains (losses) on securities	'	'	'	'
Before tax	1,345	-2,419	49,920	-81,337
Tax effect	-533	959	-19,669	32,106
Net of tax	812	-1,460	30,251	-49,231
Less: Reclassification of net (losses) gains included in net income	'	'	'	'
Before tax	-153	75	-522	328
Tax effect	62	-30	208	-131
Net of tax	-91	45	-314	197
Net unrealized gains (losses) on securities	903	-1,505	30,565	-49,428
Unrealized gains on derivative instruments	'	'	'	'
Before tax	971	647	247	4,290
Tax effect	-386	-257	-98	-1,708
Net unrealized gains on derivative instruments	585	390	149	2,582
Foreign currency translation adjustment	'	'	'	'
Before tax	-13,062	4,970	-13,976	-9,575
Tax effect	3,377	-1,065	3,598	2,296
Net foreign currency translation adjustment	-9,685	3,905	-10,378	-7,279
Total other comprehensive (loss) income	-8,197	2,790	20,336	-54,125
Comprehensive income	$32,027	$38,353	$133,601	$47,797

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	101,922	'	'	'	'	101,922	'
Other comprehensive (loss) income, net of tax	-54,125	'	'	'	'	'	-54,125
Cash dividends declared on common stock	-6,903	'	'	'	'	-6,903	'
Dividends on preferred stock	-6,744	'	'	'	'	-6,744	'
Accretion on preferred stock	0	70	'	'	'	-70	'
Stock-based compensation	6,598	'	'	6,598	0	'	'
Conversion of Series A/C preferred stock to common stock	0	-49,976	1,944	48,032	'	'	'
Common stock issued for:	'	'	'	'	'	'	'
Acquisitions	23,070	'	648	22,422	'	'	'
Exercise of stock options and warrants	2,026	'	79	2,161	-214	'	'
Restricted stock awards	37	'	135	140	-238	'	'
Employee stock purchase plan	1,848	'	47	1,801	'	'	'
Director compensation plan	1,132	'	31	1,101	'	'	'
Balance at Sep. 30, 2013	1,873,566	126,500	39,992	1,118,550	-8,290	643,228	-46,414
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	113,265	'	'	'	'	113,265	0
Other comprehensive (loss) income, net of tax	20,336	'	'	'	'	'	20,336
Cash dividends declared on common stock	-13,938	'	'	'	'	-13,938	'
Dividends on preferred stock	-4,743	'	'	'	'	-4,743	'
Stock-based compensation	5,754	'	'	5,754	'	'	'
Conversion of Series A/C preferred stock to common stock	0	-10	1	9	'	'	'
Common stock issued for:	'	'	'	'	'	'	'
Exercise of stock options and warrants	3,934	'	450	3,797	-313	'	'
Restricted stock awards	12	'	67	151	-206	'	'
Employee stock purchase plan	2,133	'	47	2,086	'	'	'
Director compensation plan	1,166	'	20	1,146	'	'	'
Balance at Sep. 30, 2014	$2,028,508	$126,467	$46,766	$1,129,975	($3,519)	$771,519	($42,700)

Consolidated_Statements_Of_Cas

Consolidated Statements Of Cash Flows (Unaudited) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Operating Activities:	'	'
Net income	$113,265	$101,922
Adjustments to reconcile net income to net cash provided by operating activities	'	'
Provision for credit losses	14,404	42,183
Depreciation and amortization	23,952	21,061
Stock-based compensation expense	5,754	6,598
Tax (expense) benefit from stock-based compensation arrangements	-279	188
Excess tax benefits from stock-based compensation arrangements	-339	-349
Net amortization of premium on securities	4,733	1,534
Mortgage servicing rights fair value change, net	706	-1,373
Originations and purchases of mortgage loans held-for-sale	-2,272,919	-2,966,058
Proceeds from sales of mortgage loans held-for-sale	2,299,103	3,108,405
(Increase) decrease in trading securities, net	-5,518	324
Net decrease (increase) in brokerage customer receivables	4,329	-4,389
Gains on mortgage loans sold	-55,160	-64,492
Losses (gains) on available-for-sale securities, net	522	-328
Losses (gains) on sales of premises and equipment, net	664	-375
Net losses (gains) on sales and fair value adjustments of other real estate owned	2,628	-1,323
Decrease in accrued interest receivable and other assets, net	78,709	27,170
Decrease in accrued interest payable and other liabilities, net	-55,874	-50,290
Net Cash Provided by Operating Activities	158,680	220,408
Investing Activities:	'	'
Proceeds from maturities of available-for-sale securities	222,434	169,139
Proceeds from sales of available-for-sale securities	578,594	129,537
Purchases of available-for-sale securities	-944,281	-240,640
Net cash received (paid) for acquisitions	228,946	-9,350
Divestiture of operations	0	-149,100
Proceeds from sales of other real estate owned	73,940	76,506
Proceeds received from the FDIC related to reimbursements on covered assets	17,652	47,408
Net (increase) decrease in interest bearing deposits with banks	-124,796	412,638
Net increase in loans	-1,011,889	-589,402
Purchases of premises and equipment, net	-30,982	-24,239
Net Cash Used for Investing Activities	-990,382	-177,503
Financing Activities:	'	'
Increase in deposit accounts	1,000,603	39,575
Decrease in other borrowings, net	-203,621	-29,009
Decrease in Federal Home Loan Bank advances, net	-70,000	-26,000
Proceeds from issuance of subordinated notes, net	139,090	0
Repayment of subordinated notes	0	-5,000
Excess tax benefits from stock-based compensation arrangements	339	349
Issuance of common shares resulting from exercise of stock options, employee stock purchase plan and conversion of common stock warrants	8,043	5,307
Common stock repurchases	-519	-452
Dividends paid	-18,681	-12,066
Net Cash Provided by (Used for) Financing Activities	855,254	-27,296
Net Increase in Cash and Cash Equivalents	23,552	15,609
Cash and Cash Equivalents at Beginning of Period	263,864	315,028
Cash and Cash Equivalents at End of Period	$287,416	$330,637

Basis_of_Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 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 and nine-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	9 Months Ended
	Sep. 30, 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.
	Revenue Recognition
	In May 2014, the FASB issued ASU No. 2014-09, which created "Revenue from Contracts with Customers (Topic 606), to clarify the principles for recognizing revenue and develop a common revenue standard for customer contracts. This ASU provides guidance regarding how an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The ASU also added a new subtopic to the codification, ASC 340-40, "Other Assets and Deferred Costs: Contracts with Customers" to provide guidance on costs related to obtaining and fulfilling a customer contract. Furthermore, the new standard requires disclosure of sufficient information to enable users of financial statements to understand the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. This guidance is effective for fiscal years beginning after December 15, 2016. The Company is current evaluating the impact of adopting this new guidance on the consolidated financial statements.

Business_Combinations

Business Combinations	9 Months Ended
	Sep. 30, 2014
Business Combinations [Abstract]	'
Business Combinations	'
	Business Combinations
	Non-FDIC Assisted Bank Acquisitions
	On August 8, 2014, the Company, through its wholly-owned subsidiary Town Bank, acquired eleven branch offices and deposits of Talmer Bank & Trust. Subsequent to this date, the Company acquired loans from these branches as well. In total, the Company acquired assets with a fair value of approximately $361.3 million, including approximately $41.5 million of loans, and assumed liabilities with a fair value of approximately $361.3 million, including approximately $354.9 million of deposits. Additionally, the Company recorded goodwill of $9.7 million on the acquisition.
	On July 11, 2014 the Company, through its wholly-owned subsidiary Town Bank, acquired the Pewaukee, Wisconsin branch of THE National Bank. The Company acquired assets with a fair value of approximately $94.1 million, including approximately $75.0 million of loans, and assumed deposits with a fair value of approximately $36.2 million. Additionally, the Company recorded goodwill of $16.3 million on the acquisition.
	On May 16, 2014, the Company, through its wholly-owned subsidiary Hinsdale Bank and Trust Company ("Hinsdale Bank") acquired the Stone Park branch office and certain related deposits of Urban Partnership Bank ("UPB"). The Company assumed liabilities with a fair value of approximately $5.5 million, including approximately $5.4 million of deposits. Additionally, the Company recorded goodwill of $678,000 on the acquisition.
	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 Wintrust Bank (formerly known as North Shore Community Bank & Trust Company). 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 announced acquisition of Delavan Bancshares, Inc. ("Delavan").
	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						Nine Months Ended
	(Dollars in thousands)	September 30,			September 30,			September 30,			September 30,
		2014			2013			2014			2013
	Balance at beginning of period	$	46,115		$	137,681		$	85,672		$	208,160
	Additions from acquisitions	—			—			—			—
	Additions from reimbursable expenses	1,584			3,062			4,933			10,922
	Amortization	(1,382		)	(1,763		)	(4,441		)	(5,884		)
	Changes in expected reimbursements from the FDIC for changes in expected credit losses	(12,124		)	(12,742		)	(41,153		)	(65,477		)
	Payments received from the FDIC	(6,834		)	(25,925		)	(17,652		)	(47,408		)
	Balance at end of period	$	27,359		$	100,313		$	27,359		$	100,313
	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.
	Specialty Finance Acquisition
	On April 28, 2014, the Company, through its wholly-owned subsidiary, First Insurance Funding of Canada, Inc., completed its acquisition of Policy Billing Services Inc. and Equity Premium Finance Inc., two affiliated Canadian insurance premium funding and payment services companies. Through this transaction, the Company acquired approximately $7.4 million of premium finance receivables. The Company recorded goodwill of approximately $6.5 million on the acquisition.
	Mortgage Banking Acquisitions
	On October 1, 2013, the Company, through its wholly-owned subsidiary, Barrington Bank and Trust Company, N.A. ("Barrington Bank"), 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	9 Months Ended
	Sep. 30, 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	9 Months Ended
	Sep. 30, 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:
		30-Sep-14
	(Dollars in thousands)	Amortized			Gross			Gross			Fair
		Cost			Unrealized			Unrealized			Value
					Gains			Losses
	U.S. Treasury	$	388,873		$	372		$	(10,984	)	$	378,261
	U.S. Government agencies	771,255			3,866			(35,369		)	739,752
	Municipal	184,015			4,969			(1,881		)	187,103
	Corporate notes:
	Financial issuers	129,259			2,252			(1,208		)	130,303
	Other	3,773			79			—			3,852
	Mortgage-backed: (1)
	Mortgage-backed securities	246,354			4,303			(8,938		)	241,719
	Collateralized mortgage obligations	49,909			357			(763		)	49,503
	Equity securities	47,595			4,958			(398		)	52,155
	Total available-for-sale securities	$	1,821,033		$	21,156		$	(59,541	)	$	1,782,648
		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
	Equity securities	50,532			1,493			(497		)	51,528
	Total available-for-sale securities	$	2,265,118		$	11,758		$	(100,586	)	$	2,176,290
		30-Sep-13
		Amortized			Gross			Gross			Fair
		Cost			Unrealized			Unrealized			Value
	(Dollars in thousands)				Gains			Losses
	U.S. Treasury	$	225,190		$	150		$	(14,438	)	$	210,902
	U.S. Government agencies	954,050			2,213			(43,574		)	912,689
	Municipal	152,010			1,983			(3,346		)	150,647
	Corporate notes:
	Financial issuers	132,320			2,252			(2,513		)	132,059
	Other	7,011			126			(15		)	7,122
	Mortgage-backed: (1)
	Mortgage-backed securities	268,166			4,157			(12,861		)	259,462
	Collateralized mortgage obligations	60,001			458			(728		)	59,731
	Equity securities	53,837			1,097			(5,663		)	49,271
	Total available-for-sale securities	$	1,852,585		$	12,436		$	(83,138	)	$	1,781,883
	-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 September 30, 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	$	10,006		$	(3	)	$	189,172		$	(10,981	)	$	199,178	$	(10,984	)
	U.S. Government agencies	13,557			(78		)	447,369			(35,291		)	460,926		(35,369		)
	Municipal	9,029			(113		)	47,937			(1,768		)	56,966		(1,881		)
	Corporate notes:
	Financial issuers	1,318			(3		)	57,982			(1,205		)	59,300		(1,208		)
	Other	—			—			—			—			—		—
	Mortgage-backed:
	Mortgage-backed securities	14,619			(3		)	141,358			(8,935		)	155,977		(8,938		)
	Collateralized mortgage obligations	16,475			(150		)	13,728			(613		)	30,203		(763		)
	Equity securities	—			—			10,399			(398		)	10,399		(398		)
Total	$	65,004		$	(350	)	$	907,945		$	(59,191	)	$	972,949	$	(59,541	)
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 September 30, 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 agency bonds, treasury notes and mortgage-backed securities. Unrealized losses recognized on agency bonds, treasury notes and mortgage-backed securities are the result of increases in yields for similar types of securities which also 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						Nine months ended
(Dollars in thousands)	September 30,			September 30,			September 30,			September 30,
	2014			2013			2014			2013
Realized gains	$	179		$	118		$	333		$	434
Realized losses	(332		)	(43		)	(855		)	(106		)
Net realized (losses) gains	$	(153	)	$	75		$	(522	)	$	328
Other than temporary impairment charges	—			—			—			—
(Losses) gains on available-for-sale securities, net	$	(153	)	$	75		$	(522	)	$	328
Proceeds from sales of available-for-sale securities	$	382,552		$	45,078		$	578,594		$	129,537
The amortized cost and fair value of securities as of September 30, 2014, December 31, 2013 and September 30, 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:
	30-Sep-14						31-Dec-13						30-Sep-13
(Dollars in thousands)	Amortized Cost			Fair Value			Amortized Cost			Fair Value			Amortized Cost		Fair Value
Due in one year or less	$	216,244		$	216,582		$	268,847		$	269,168		$	285,746	$	286,066
Due in one to five years	309,914			310,917			358,108			358,357			316,076		316,474
Due in five to ten years	327,505			317,654			350,372			330,020			344,742		328,895
Due after ten years	623,512			594,118			616,840			561,992			524,017		481,984
Mortgage-backed	296,263			291,222			620,419			605,225			328,167		319,193
Equity securities	47,595			52,155			50,532			51,528			53,837		49,271
Total available-for-sale securities	$	1,821,033		$	1,782,648		$	2,265,118		$	2,176,290		$	1,852,585	$	1,781,883
Securities having a carrying value of $1.1 billion at September 30, 2014, $1.2 billion at December 31, 2013 and $1.2 billion at September 30, 2013, were pledged as collateral for public deposits, trust deposits, FHLB advances, securities sold under repurchase agreements and derivatives. At September 30, 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	9 Months Ended
	Sep. 30, 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:
		September 30,			December 31,			September 30,
	(Dollars in thousands)	2014			2013			2013
	Balance:
	Commercial	$	3,689,671		$	3,253,687		$	3,109,121
	Commercial real-estate	4,510,375			4,230,035			4,146,110
	Home equity	720,058			719,137			736,620
	Residential real-estate	470,319			434,992			397,707
	Premium finance receivables—commercial	2,377,892			2,167,565			2,150,481
	Premium finance receivables—life insurance	2,134,405			1,923,698			1,869,739
	Consumer and other	149,339			167,488			171,261
	Total loans, net of unearned income, excluding covered loans	$	14,052,059		$	12,896,602		$	12,581,039
	Covered loans	254,605			346,431			415,988
	Total loans	$	14,306,664		$	13,243,033		$	12,997,027
	Mix:
	Commercial	26		%	25		%	24		%
	Commercial real-estate	31			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	15			15			14
	Consumer and other	1			1			2
	Total loans, net of unearned income, excluding covered loans	98		%	97		%	97		%
	Covered loans	2			3			3
	Total loans	100		%	100		%	100		%
	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.
	Certain premium finance receivables are recorded net of unearned income. The unearned income portions of such premium finance receivables were $44.8 million at September 30, 2014, $41.9 million at December 31, 2013 and $40.6 million at September 30, 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 $(6.3) million at September 30, 2014, $(9.2) million at December 31, 2013 and $(1.5) million at September 30, 2013. The net credit balances at September 30, 2014, December 31, 2013 and September 30, 2013 are primarily the result of purchase accounting adjustments related to the various acquisitions in 2014 and 2013.
	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:
		30-Sep-14						31-Dec-13
		Unpaid			Carrying			Unpaid			Carrying
		Principal						Principal
	(Dollars in thousands)	Balance			Value			Balance			Value
	Bank acquisitions	$	316,682		$	247,678		$	453,944		$	338,517
	Life insurance premium finance loans acquisition	415,458			407,602			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 September 30, 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
		30-Sep-14						30-Sep-13
	(Dollars in thousands)	Bank Acquisitions			Life Insurance			Bank			Life Insurance
					Premium Finance Loans			Acquisitions			Premium
											Finance Loans
	Accretable yield, beginning balance	$	92,102		$	5,179		$	130,856		$	10,287
	Acquisitions	—			—			—			—
	Accretable yield amortized to interest income	(6,722		)	(1,125		)	(9,056		)	(1,943		)
	Accretable yield amortized to indemnification asset (1)	(8,784		)	—			(8,279		)	—
	Reclassification from non-accretable difference (2)	2,584			—			8,703			234
	Increases (decreases) in interest cash flows due to payments and changes in interest rates	4,564			111			(5,194		)	235
	Accretable yield, ending balance (3)	$	83,744		$	4,165		$	117,030		$	8,813
		Nine Months Ended						Nine Months Ended
		30-Sep-14						30-Sep-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	—			—			1,977			—
	Accretable yield amortized to interest income	(24,109		)	(4,329		)	(27,980		)	(6,216		)
	Accretable yield amortized to indemnification asset (1)	(25,593		)	—			(28,891		)	—
Reclassification from non-accretable difference (2)	29,092			—			44,907			1,241
(Decreases) increases in interest cash flows due to payments and changes in interest rates	(3,301		)	240			(16,207		)	733
Accretable yield, ending balance (3)	$	83,744		$	4,165		$	117,030		$	8,813
-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 September 30, 2014, the Company estimates that the remaining accretable yield balance to be amortized to the indemnification asset for the bank acquisitions is $21.0 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 $6.7 million and $9.1 million in the third quarter of 2014 and 2013, respectively. On a year-to-date basis, accretion to interest income from loans acquired in bank acquisitions totaled $24.1 million for the first nine months of 2014 compared to $28.0 million in the same period of the prior year. 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	9 Months Ended
	Sep. 30, 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 September 30, 2014, December 31, 2013 and September 30, 2013:
	As of September 30, 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	$	10,430			$	—			$	7,333			$	8,559			$	2,044,505			$	2,070,827
	Franchise	—				—				—				1,221				237,079				238,300
	Mortgage warehouse lines of credit	—				—				—				—				121,585				121,585
	Community Advantage—homeowners association	—				—				—				—				99,595				99,595
	Aircraft	—				—				—				—				6,146				6,146
	Asset-based lending	25				—				2,959				1,220				777,723				781,927
	Tax exempt	—				—				—				—				205,150				205,150
	Leases	—				—				—				—				145,439				145,439
	Other	—				—				—				—				11,403				11,403
	PCI - commercial (1)	—				863				64				137				8,235				9,299
	Total commercial	10,455				863				10,356				11,137				3,656,860				3,689,671
	Commercial real-estate:
	Residential construction	—				—				—				—				30,237				30,237
	Commercial construction	425				—				—				—				159,383				159,808
	Land	2,556				—				1,316				2,918				94,449				101,239
	Office	7,366				—				1,696				1,888				688,390				699,340
	Industrial	2,626				—				224				367				624,669				627,886
	Retail	6,205				—				—				4,117				715,568				725,890
	Multi-family	249				—				793				2,319				674,610				677,971
	Mixed use and other	7,936				—				1,468				10,323				1,407,659				1,427,386
	PCI - commercial real-estate (1)	—				14,294				—				5,807				40,517				60,618
	Total commercial real-estate	27,363				14,294				5,497				27,739				4,435,482				4,510,375
	Home equity	5,696				—				1,181				2,597				710,584				720,058
	Residential real estate	15,730				—				670				2,696				448,528				467,624
	PCI - residential real estate (1)	—				930				30				—				1,735				2,695
	Premium finance receivables
	Commercial insurance loans	14,110				7,115				6,279				14,157				2,336,231				2,377,892
	Life insurance loans	—				—				7,533				6,942				1,712,328				1,726,803
	PCI - life insurance loans (1)	—				—				—				—				407,602				407,602
	Consumer and other	426				175				123				1,133				147,482				149,339
	Total loans, net of unearned income, excluding covered loans	$	73,780			$	23,377			$	31,669			$	66,401			$	13,856,832			$	14,052,059
	Covered loans	6,042				26,170				4,289				5,655				212,449				254,605
	Total loans, net of unearned income	$	79,822			$	49,547			$	35,958			$	72,056			$	14,069,281			$	14,306,664
	-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				286				76				1,010				164,979				167,488
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 September 30, 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	$	15,283			$	190			$	3,585			$	15,261			$	1,688,232			$	1,722,551
Franchise	—				—				113				—				213,215				213,328
Mortgage warehouse lines of credit	—				—				—				—				71,383				71,383
Community Advantage—homeowners association	—				—				—				—				90,504				90,504
Aircraft	—				—				—				—				12,601				12,601
Asset-based lending	2,364				—				693				3,926				732,585				739,568
Tax exempt	—				—				—				—				148,103				148,103
Leases	—				—				—				—				101,654				101,654
Other	—				—				—				—				90				90
PCI - commercial (1)	—				265				—				1,642				7,432				9,339
Total commercial	17,647				455				4,391				20,829				3,065,799				3,109,121
Commercial real-estate:
Residential construction	2,049				3,120				1,595				261				33,305				40,330
Commercial construction	7,854				—				—				—				138,234				146,088
Land	4,216				—				—				4,082				100,953				109,251
Office	4,318				—				3,965				1,270				624,967				634,520
Industrial	8,184				—				—				2,419				614,409				625,012
Retail	11,259				—				271				7,422				593,263				612,215
Multi-family	2,603				—				—				4,332				543,690				550,625
Mixed use and other	12,240				269				2,761				15,371				1,339,029				1,369,670
PCI - commercial real-estate (1)	—				9,607				3,380				2,702				42,710				58,399
Total commercial real-estate	52,723				12,996				11,972				37,859				4,030,560				4,146,110
Home equity	10,926				—				2,436				5,887				717,371				736,620
Residential real estate	14,126				—				1,749				2,844				377,489				396,208
PCI - residential real estate (1)	—				447				289				34				729				1,499
Premium finance receivables
Commercial insurance loans	10,132				11,751				5,307				14,628				2,108,663				2,150,481
Life insurance loans	14				592				6,428				—				1,402,822				1,409,856
PCI - life insurance loans (1)	—				—				—				—				459,883				459,883
Consumer and other	1,671				128				416				695				168,351				171,261
Total loans, net of unearned income, excluding covered loans	$	107,239			$	26,369			$	32,988			$	82,776			$	12,331,667			$	12,581,039
Covered loans	8,602				81,430				9,813				9,216				306,927				415,988
Total loans, net of unearned income	$	115,841			$	107,799			$	42,801			$	91,992			$	12,638,594			$	12,997,027
-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 September 30, 2014, December 31, 2013 and September 30, 2013:
	Performing												Non-performing											Total
(Dollars in thousands)	30-Sep-14				31-Dec-13				30-Sep-13				30-Sep-14				31-Dec-13				30-Sep-13			30-Sep-14			31-Dec-13		30-Sep-13
Loan Balances:
Commercial
Commercial and industrial	$	2,060,397			$	1,826,063			$	1,707,078			$	10,430			$	10,143			$	15,473		$	2,070,827		$	1,836,206	$	1,722,551
Franchise	238,300				220,383				213,328				—				—				—			238,300			220,383		213,328
Mortgage warehouse lines of credit	121,585				67,470				71,383				—				—				—			121,585			67,470		71,383
Community Advantage—homeowners association	99,595				90,894				90,504				—				—				—			99,595			90,894		90,504
Aircraft	6,146				10,241				12,601				—				—				—			6,146			10,241		12,601
Asset-based lending	781,902				734,456				737,204				25				637				2,364			781,927			735,093		739,568
Tax exempt	205,150				161,239				148,103				—				—				—			205,150			161,239		148,103
Leases	145,439				109,831				101,654				—				—				—			145,439			109,831		101,654
Other	11,403				11,147				90				—				—				—			11,403			11,147		90
PCI - commercial (1)	9,299				11,183				9,339				—				—				—			9,299			11,183		9,339
Total commercial	3,679,216				3,242,907				3,091,284				10,455				10,780				17,837			3,689,671			3,253,687		3,109,121
Commercial real-estate
Residential construction	30,237				38,351				35,161				—				149				5,169			30,237			38,500		40,330
Commercial construction	159,383				129,737				138,234				425				6,969				7,854			159,808			136,706		146,088
Land	98,683				103,971				105,035				2,556				2,814				4,216			101,239			106,785		109,251
Office	691,974				632,154				630,202				7,366				10,087				4,318			699,340			642,241		634,520
Industrial	625,260				628,284				616,828				2,626				5,654				8,184			627,886			633,938		625,012
Retail	719,685				645,397				600,956				6,205				10,862				11,259			725,890			656,259		612,215
Multi-family	677,722				564,502				548,022				249				2,035				2,603			677,971			566,537		550,625
Mixed use and other	1,419,450				1,364,136				1,357,161				7,936				8,318				12,509			1,427,386			1,372,454		1,369,670
PCI - commercial real-estate(1)	60,618				76,615				58,399				—				—				—			60,618			76,615		58,399
Total commercial real-estate	4,483,012				4,183,147				4,089,998				27,363				46,888				56,112			4,510,375			4,230,035		4,146,110
Home equity	714,362				709,066				725,694				5,696				10,071				10,926			720,058			719,137		736,620
Residential real-estate	451,894				417,151				382,082				15,730				14,974				14,126			467,624			432,125		396,208
PCI - residential real-estate (1)	2,695				2,867				1,499				—				—				—			2,695			2,867		1,499
Premium finance receivables
Commercial insurance loans	2,356,667				2,148,186				2,128,598				21,225				19,379				21,883			2,377,892			2,167,565		2,150,481
Life insurance loans	1,726,803				1,499,792				1,409,250				—				—				606			1,726,803			1,499,792		1,409,856
PCI - life insurance loans (1)	407,602				423,906				459,883				—				—				—			407,602			423,906		459,883
Consumer and other	148,738				166,246				169,490				601				1,242				1,771			149,339			167,488		171,261
Total loans, net of unearned income, excluding covered loans	$	13,970,989			$	12,793,268			$	12,457,778			$	81,070			$	103,334			$	123,261		$	14,052,059		$	12,896,602	$	12,581,039
-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 months and nine months ended September 30, 2014 and 2013 is as follows:
Three months ended September 30, 2014					Commercial Real-estate				Home  Equity				Residential Real-estate				Premium Finance Receivable				Consumer and Other			Total, Excluding Covered Loans
(Dollars in thousands)	Commercial
Allowance for credit losses
Allowance for loan losses at beginning of period	$	26,038			$	40,702			$	13,918			$	3,733			$	6,309			$	1,553		$	92,253
Other adjustments	(32		)		(265		)		(1		)		(2		)		(35		)		—			(335		)
Reclassification from allowance for unfunded lending-related commitments	—				62				—				—				—				—			62
Charge-offs	(832		)		(4,510		)		(748		)		(205		)		(1,557		)		(250		)	(8,102		)
Recoveries	296				275				99				111				290				42			1,113
Provision for credit losses	2,442				2,395				(308		)		405				1,260				(166		)	6,028
Allowance for loan losses at period end	$	27,912			$	38,659			$	12,960			$	4,042			$	6,267			$	1,179		$	91,019
Allowance for unfunded lending-related commitments at period end	$	—			$	822			$	—			$	—			$	—			$	—		$	822
Allowance for credit losses at period end	$	27,912			$	39,481			$	12,960			$	4,042			$	6,267			$	1,179		$	91,841
Individually evaluated for impairment	$	2,296			$	3,507			$	292			$	512			$	—			$	53		$	6,660
Collectively evaluated for impairment	25,427				35,967				12,668				3,530				6,267				1,103			84,962
Loans acquired with deteriorated credit quality	189				7				—				—				—				23			219
Loans at period end
Individually evaluated for impairment	$	16,568			$	89,201			$	5,922			$	18,383			$	—			$	870		$	130,944
Collectively evaluated for impairment	3,663,804				4,360,556				714,136				449,241				4,104,695				148,469			13,440,901
Loans acquired with deteriorated credit quality	9,299				60,618				—				2,695				407,602				—			480,214
Three months ended September 30, 2013	Commercial				Commercial Real-estate				Home  Equity				Residential Real-estate				Premium Finance Receivable				Consumer and Other			Total, Excluding Covered Loans
(Dollars in thousands)
Allowance for credit losses
Allowance for loan losses at beginning of period	$	28,737			$	51,950			$	14,205			$	4,825			$	5,268			$	1,857		$	106,842
Other adjustments	(15		)		(193		)		—				(4		)		7				—			(205		)
Reclassification from allowance for unfunded lending-related commitments	—				284				—				—				—				—			284
Charge-offs	(3,281		)		(6,982		)		(711		)		(328		)		(1,297		)		(216		)	(12,815		)
Recoveries	756				272				43				64				316				51			1,502
Provision for credit losses	2,044				5,488				1,824				700				1,193				331			11,580
Allowance for loan losses at period end	$	28,241			$	50,819			$	15,361			$	5,257			$	5,487			$	2,023		$	107,188
Allowance for unfunded lending-related commitments at period end	$	—			$	1,267			$	—			$	—			$	—			$	—		$	1,267
Allowance for credit losses at period end	$	28,241			$	52,086			$	15,361			$	5,257			$	5,487			$	2,023		$	108,455
Individually evaluated for impairment	$	5,498			$	5,892			$	2,447			$	886			$	—			$	252		$	14,975
Collectively evaluated for impairment	22,636				46,080				12,914				4,371				5,487				1,771			93,259
Loans acquired with deteriorated credit quality	107				114				—				—				—				—			221
Loans at period end
Individually evaluated for impairment	$	24,688			$	124,401			$	11,152			$	16,746			$	—			$	1,774		$	178,761
Collectively evaluated for impairment	3,075,094				3,963,310				725,468				379,462				3,560,337				169,308			11,872,979
Loans acquired with deteriorated credit quality	9,339				58,399				—				1,499				459,883				179			529,299
Nine months ended September 30, 2014					Commercial Real-estate				Home  Equity				Residential Real-estate				Premium Finance Receivable				Consumer and Other			Total, Excluding Covered Loans
(Dollars in thousands)	Commercial
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	(69		)		(482		)		(3		)		(6		)		(28		)		—			(588		)
Reclassification to allowance for unfunded lending-related commitments	—				(102		)		—				—				—				—			(102		)
Charge-offs	(3,864		)		(11,354		)		(3,745		)		(1,120		)		(4,259		)		(636		)	(24,978		)
Recoveries	883				762				478				316				925				256			3,620
Provision for credit losses	7,870				1,177				3,619				(256		)		4,046				(311		)	16,145
Allowance for loan losses at period end	$	27,912			$	38,659			$	12,960			$	4,042			$	6,267			$	1,179		$	91,019
Allowance for unfunded lending-related commitments at period end	$	—			$	822			$	—			$	—			$	—			$	—		$	822
Allowance for credit losses at period end	$	27,912			$	39,481			$	12,960			$	4,042			$	6,267			$	1,179		$	91,841
Nine months ended September 30, 2013					Commercial Real-estate				Home  Equity				Residential Real-estate				Premium Finance Receivable				Consumer and Other			Total, Excluding Covered Loans
(Dollars in thousands)	Commercial
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	(19		)		(621		)		—				(98		)		(5		)		—			(743		)
Reclassification to allowance for unfunded lending-related commitments	—				136				—				—				—				—			136
Charge-offs	(8,914		)		(25,228		)		(4,893		)		(2,573		)		(3,671		)		(473		)	(45,752		)
Recoveries	1,319				1,224				376				87				889				221			4,116
Provision for credit losses	7,061				23,173				7,144				2,281				2,178				243			42,080
Allowance for loan losses at period end	$	28,241			$	50,819			$	15,361			$	5,257			$	5,487			$	2,023		$	107,188
Allowance for unfunded lending-related commitments at period end	$	—			$	1,267			$	—			$	—			$	—			$	—		$	1,267
Allowance for credit losses at period end	$	28,241			$	52,086			$	15,361			$	5,257			$	5,487			$	2,023		$	108,455
A summary of activity in the allowance for covered loan losses for the three months and nine months ended September 30, 2014 and 2013 is as follows:
	Three Months Ended								Nine Months Ended
	September 30,				September 30,				September 30,				September 30,
(Dollars in thousands)	2014				2013				2014				2013
Balance at beginning of period	$	1,667			$	14,429			$	10,092			$	13,454
Provision for covered loan losses before benefit attributable to FDIC loss share agreements	(818		)		(2,331		)		(8,703		)		515
Benefit attributable to FDIC loss share agreements	654				1,865				6,962				(412		)
Net provision for covered loan losses	(164		)		(466		)		(1,741		)		103
(Decrease) increase in FDIC indemnification asset	(654		)		(1,865		)		(6,962		)		412
Loans charged-off	(293		)		(3,237		)		(5,346		)		(8,294		)
Recoveries of loans charged-off	2,099				4,063				6,612				7,249
Net recoveries (charge-offs)	1,806				826				1,266				(1,045		)
Balance at end of period	$	2,655			$	12,924			$	2,655			$	12,924
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:
	September 30,				December 31,				September 30,
(Dollars in thousands)	2014				2013				2013
Impaired loans (included in non-performing and TDRs):
Impaired loans with an allowance for loan loss required (1)	$	68,471			$	92,184			$	99,437
Impaired loans with no allowance for loan loss required	61,066				70,045				76,861
Total impaired loans (2)	$	129,537			$	162,229			$	176,298
Allowance for loan losses related to impaired loans	$	6,577			$	8,265			$	14,329
TDRs	$	83,385			$	107,103			$	115,003
-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 Nine Months Ended
	As of September 30, 2014												30-Sep-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	$	8,384			$	11,333			$	2,273			$	9,367			$	537
Franchise	—				—				—				—				—
Mortgage warehouse lines of credit	—				—				—				—				—
Community Advantage—homeowners association	—				—				—				—				—
Aircraft	—				—				—				—				—
Asset-based lending	—				—				—				—				—
Tax exempt	—				—				—				—				—
Leases	—				—				—				—				—
Other	—				—				—				—				—
Commercial real-estate
Residential construction	—				—				—				—				—
Commercial construction	425				440				195				432				15
Land	7,502				7,502				40				7,572				193
Office	8,198				9,671				322				8,493				300
Industrial	2,567				2,672				151				2,595				92
Retail	10,861				11,279				921				10,826				362
Multi-family	2,822				3,335				107				2,847				109
Mixed use and other	21,172				21,453				1,738				20,891				656
Home equity	1,438				1,533				292				1,491				42
Residential real-estate	4,889				4,986				485				4,783				157
Premium finance receivables
Commercial insurance	—				—				—				—				—
Life insurance	—				—				—				—				—
PCI - life insurance	—				—				—				—				—
Consumer and other	213				215				53				215				6
Impaired loans with no related ASC 310 allowance recorded
Commercial
Commercial and industrial	$	7,563			$	8,285			$	—			$	7,909			$	306
Franchise	—				—				—				—				—
Mortgage warehouse lines of credit	—				—				—				—				—
Community Advantage—homeowners association	—				—				—				—				—
Aircraft	—				—				—				—				—
Asset-based lending	25				1,952				—				108				75
Tax exempt	—				—				—				—				—
Leases	—				—				—				—				—
Other	—				—				—				—				—
Commercial real-estate
Residential construction	—				—				—				—				—
Commercial construction	2,803				2,803				—				2,777				98
Land	8,101				12,432				—				8,969				538
Office	5,159				6,359				—				6,679				244
Industrial	1,903				2,110				—				1,962				76
Retail	8,095				10,177				—				8,647				342
Multi-family	—				—				—				—				—
Mixed use and other	9,042				11,772				—				9,467				445
Home equity	4,484				6,490				—				4,806				207
Residential real-estate	13,234				14,953				—				13,291				496
Premium finance receivables
Commercial insurance	—				—				—				—				—
Life insurance	—				—				—				—				—
PCI - life insurance	—				—				—				—				—
Consumer and other	657				721				—				665				29
Total loans, net of unearned income, excluding covered loans	$	129,537			$	152,473			$	6,577			$	134,792			$	5,325
													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 Nine Months Ended
	As of September 30, 2013												30-Sep-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	$	10,599			$	12,226			$	3,915			$	11,155			$	558
Franchise	—				—				—				—				—
Mortgage warehouse lines of credit	—				—				—				—				—
Community Advantage—homeowners association	—				—				—				—				—
Aircraft	—				—				—				—				—
Asset-based lending	2,287				2,296				1,549				2,299				86
Tax exempt	—				—				—				—				—
Leases	—				—				—				—				—
Other	—				—				—				—				—
Commercial real-estate
Residential construction	377				377				49				379				19
Commercial construction	9,577				9,577				103				10,051				284
Land	12,161				15,486				947				12,321				445
Office	7,322				7,376				111				7,426				207
Industrial	3,352				3,417				177				3,402				124
Retail	18,583				18,662				1,942				18,859				564
Multi-family	3,715				4,188				260				3,809				143
Mixed use and other	19,451				19,711				1,721				18,569				669
Home equity	5,347				5,559				2,447				5,468				187
Residential real-estate	5,999				6,533				856				5,418				170
Premium finance receivables
Commercial insurance	—				—				—				—				—
Life insurance	—				—				—				—				—
Purchased life insurance	—				—				—				—				—
Consumer and other	667				668				252				661				25
Impaired loans with no related ASC 310 allowance recorded
Commercial
Commercial and industrial	$	10,858			$	15,320			$	—			$	13,841			$	683
Franchise	—				—				—				—				—
Mortgage warehouse lines of credit	—				—				—				—				—
Community Advantage—homeowners association	—				—				—				—				—
Aircraft	—				—				—				—				—
Asset-based lending	76				1,416				—				87				57
Tax exempt	—				—				—				—				—
Leases	—				—				—				—				—
Other	—				—				—				—				—
Commercial real-estate
Residential construction	3,267				3,426				—				3,954				122
Commercial construction	8,705				13,939				—				10,899				564
Land	4,980				6,094				—				3,869				181
Office	7,329				9,324				—				8,242				358
Industrial	7,668				7,833				—				7,772				357
Retail	6,230				6,549				—				6,270				257
Multi-family	1,149				2,983				—				1,868				115
Mixed use and other	9,205				11,256				—				8,181				362
Home equity	5,805				7,215				—				5,568				221
Residential real-estate	10,482				12,841				—				9,805				292
Premium finance receivables
Commercial insurance	—				—				—				—				—
Life insurance	—				—				—				—				—
Purchased life insurance	—				—				—				—				—
Consumer and other	1,107				1,652				—				1,128				79
Total loans, net of unearned income, excluding covered loans	$	176,298			$	205,924			$	14,329			$	181,301			$	7,129
TDRs
At September 30, 2014, the Company had $83.4 million in loans modified in TDRs. The $83.4 million in TDRs represents 145 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 at any subsequent re-modification 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 current interest rate represents a market rate at the time of 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.
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 September 30, 2014 and approximately $2.0 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 September 30, 2014 and 2013, the Company recorded $294,000 and $205,000, respectively, in interest income representing this decrease in impairment. For the nine months ended September 30, 2014 and 2013, the Company recorded $529,000 and $727,000, respectively, in interest income.
The tables below present a summary of the post-modification balance of loans restructured during the three months ended September 30, 2014 and 2013, respectively, which represent TDRs:
Three months ended		Total (1)(2)							Extension at							Reduction of Interest							Modification to					Forgiveness of Debt(2)
30-Sep-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		—			$	—			—			$	—			—			$	—			—		$	—		—	$	—
Commercial real-estate
Commercial construction		—			—				—			—				—			—				—		—			—	—
Land		—			—				—			—				—			—				—		—			—	—
Office		—			—				—			—				—			—				—		—			—	—
Industrial		—			—				—			—				—			—				—		—			—	—
Retail		—			—				—			—				—			—				—		—			—	—
Multi-family		—			—				—			—				—			—				—		—			—	—
Mixed use and other		—			—				—			—				—			—				—		—			—	—
Residential real estate and other		3			667				2			456				3			667				—		—			—	—
Total loans		3			$	667			2			$	456			3			$	667			—		$	—		—	$	—
Three months ended		Total (1)(2)							Extension at							Reduction of Interest							Modification to					Forgiveness of Debt(2)
30-Sep-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		—			$	—			—			$	—			—			$	—			—		$	—		—	$	—
Commercial real-estate
Commercial construction		—			—				—			—				—			—				—		—			—	—
Land		1			2,352				1			2,352				—			—				—		—			—	—
Office		1			556				1			556				1			556				—		—			—	—
Industrial		—			—				—			—				—			—				—		—			—	—
Retail		—			—				—			—				—			—				—		—			—	—
Multi-family		—			—				—			—				—			—				—		—			—	—
Mixed use and other		1			95				1			95				—			—				—		—			—	—
Residential real estate and other		1			1,000				1			1,000				—			—				—		—			1	1,000
Total loans		4			$	4,003			4			$	4,003			1			$	556			—		$	—		1	$	1,000
-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 September 30, 2014, three loans totaling $667,000 were determined to be TDRs, compared to four loans totaling $4.0 million in the same period of 2013. Of these loans extended at below market terms, the weighted average extension had a term of approximately 18 months during the three months ended September 30, 2014 compared to 26 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 261 basis points and 150 basis points during the three months ending September 30, 2014 and 2013, respectively. Additionally, no principal balances were forgiven in the third quarter of 2014 compared to $1.0 million in principal forgiveness during the same period of 2013.
Nine months ended		Total (1)(2)							Extension at							Reduction of Interest							Modification to					Forgiveness of Debt(2)
30-Sep-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
Commercial construction		—			—				—			—				—			—				—		—			—	—
Land		—			—				—			—				—			—				—		—			—	—
Office		1			790				1			790				—			—				—		—			—	—
Industrial		1			1,078				1			1,078				—			—				1		1,078			—	—
Retail		1			202				1			202				—			—				—		—			—	—
Multi-family		1			181				—			—				1			181				—		—			—	—
Mixed use and other		7			4,926				3			2,837				7			4,926				1		1,273			—	—
Residential real estate and other		4			887				3			676				3			667				1		220			—	—
Total loans		16			$	8,152			10			$	5,671			11			$	5,774			4		$	2,659		—	$	—
Nine months ended		Total (1)(2)							Extension at							Reduction of Interest							Modification to					Forgiveness of Debt(2)
30-Sep-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
Commercial construction		3			6,120				3			6,120				—			—				3		6,120			—	—
Land		3			2,639				3			2,639				2			287				—		—			1	73
Office		4			4,021				4			4,021				1			556				—		—			—	—
Industrial		1			949				1			949				1			949				—		—			—	—
Retail		1			200				1			200				1			200				—		—			—	—
Multi-family		1			705				1			705				1			705				—		—			—	—
Mixed use and other		3			3,628				3			3,628				2			3,533				—		—			—	—
Residential real estate and other		8			1,778				4			1,095				6			762				2		234			1	1,000
Total loans		30			$	20,748			25			$	19,930			18			$	7,545			7		$	6,539		2	$	1,073
-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 nine months ended September 30, 2014, 16 loans totaling $8.2 million were determined to be TDRs, compared to 30 loans totaling $20.7 million in the same period of 2013. Of these loans extended at below market terms, the weighted average extension had a term of approximately 14 months during the nine months ended September 30, 2014 compared to 19 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 178 basis points and 199 basis points during the nine months ending September 30, 2014 and 2013, respectively. Interest-only payment terms were approximately nine months and eleven months during the nine months ending September 30, 2014 and 2013, respectively. Additionally, no balances were forgiven in the first nine months of 2014 compared to $1.0 million in 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 September 30, 2014 and 2013, and such loans which were in payment default under the restructured terms during the respective periods below:
(Dollars in thousands)	As of September 30, 2014							Three Months Ended							Nine Months Ended
								September 30, 2014							30-Sep-14
	Total (1)(3)							Payments in Default  (2)(3)							Payments in Default  (2)(3)
	Count			Balance				Count			Balance				Count			Balance
Commercial
Commercial and industrial	1			$	88			1			$	88			1			$	88
Commercial real-estate
Commercial construction	—			—				—			—				—			—
Land	—			—				—			—				—			—
Office	1			790				—			—				—			—
Industrial	1			1,078				1			1,078				1			1,078
Retail	1			202				—			—				—			—
Multi-family	1			181				—			—				—			—
Mixed use and other	10			6,341				2			482				2			482
Residential real estate and other	6			1,406				2			380				2			380
Total loans	21			$	10,086			6			$	2,028			6			$	2,028
-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.
(Dollars in thousands)	As of September 30, 2013							Three Months Ended							Nine Months Ended
								September 30, 2013							30-Sep-13
	Total (1)(3)							Payments in Default  (2)(3)							Payments in Default  (2)(3)
	Count			Balance				Count			Balance				Count			Balance
Commercial
Commercial and industrial	8			$	1,694			1			$	161			2			$	181
Commercial real-estate
Commercial construction	3			6,120				—			—				—			—
Land	3			2,639				1			215				1			215
Office	4			4,021				1			1,648				1			1,648
Industrial	2			1,676				1			727				1			727
Retail	2			431				—			—				—			—
Multi-family	1			705				—			—				1			705
Mixed use and other	5			4,217				1			95				2			368
Residential real estate and other	9			1,904				1			126				1			126
Total loans	37			$	23,407			6			$	2,972			9			$	3,970
-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	9 Months Ended
	Sep. 30, 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			September 30,
		2014			Acquired			Loss						2014
	Community banking	$	305,313		$	26,439		$	—		$	—		$	331,752
	Specialty finance	37,370			6,545			—			(1,177		)	42,738
	Wealth management	31,864			250			—			—			32,114
	Total	$	374,547		$	33,234		$	—		$	(1,177	)	$	406,604
	The community banking segment's goodwill increased $26.4 million in 2014 as a result of the acquisition of certain branches of Talmer Bank & Trust and the acquisition of the Pewaukee, Wisconsin branch of THE National Bank in the third quarter of 2014 as well as the acquisition of the Stone Park branch office and certain related deposits of Urban Partnership Bank in the second quarter of 2014. The specialty finance segment’s goodwill increased $5.4 million in 2014 as a result of the acquisitions of Policy Billing Services Inc. and Equity Premium Finance Inc. during the second quarter of 2014, partially offset by foreign currency translation adjustments related to previous Canadian acquisitions.The wealth management banking segment's goodwill increased $250,000 as a result of the acquisition of the trust operations related to Talmer Bank & Trust.
	At June 30, 2014, the Company utilized a quantitative approach for its annual goodwill impairment test of the community banking segment and determined that it is not more likely than not that an impairment existed at that time. The annual goodwill impairment tests of the specialty finance and wealth management segments will be conducted at December 31, 2014.
	A summary of finite-lived intangible assets as of the dates shown and the expected amortization as of September 30, 2014 is as follows:
	(Dollars in thousands)	September 30,			31-Dec-13			September 30,
		2014						2013
	Community banking segment:
	Core deposit intangibles:
	Gross carrying amount	$	40,438		$	40,770		$	39,350
	Accumulated amortization	(27,909		)	(29,189		)	(28,143		)
	Net carrying amount	$	12,529		$	11,581		$	11,207
	Specialty finance segment:
	Customer list intangibles:
	Gross carrying amount	$	1,800		$	1,800		$	1,800
	Accumulated amortization	(910		)	(805		)	(769		)
	Net carrying amount	$	890		$	995		$	1,031
	Wealth management segment:
	Customer list and other intangibles:
	Gross carrying amount	$	7,940		$	7,690		$	7,690
	Accumulated amortization	(1,375		)	(1,053		)	(946		)
	Net carrying amount	$	6,565		$	6,637		$	6,744
	Total other intangible assets, net	$	19,984		$	19,213		$	18,982
	Estimated amortization
	Actual in nine months ended September 30, 2014	$	3,521
	Estimated remaining in 2014	1,171
	Estimated—2015	3,519
	Estimated—2016	2,833
	Estimated—2017	2,346
	Estimated—2018	2,052
	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 $3.5 million and $3.4 million for the nine months ended September 30, 2014 and 2013, respectively.

Deposits

Deposits	9 Months Ended
	Sep. 30, 2014
Deposits [Abstract]	'
Deposits	'
	Deposits
	The following table is a summary of deposits as of the dates shown:
	(Dollars in thousands)	September 30,			December 31, 2013			September 30,
		2014						2013
	Balance:
	Non-interest bearing	$	3,253,477		$	2,721,771		$	2,622,518
	NOW and interest bearing demand deposits	2,086,099			1,953,882			1,922,906
	Wealth management deposits	1,212,317			1,013,850			1,099,509
	Money market	3,744,682			3,359,999			3,423,413
	Savings	1,465,250			1,392,575			1,318,147
	Time certificates of deposit	4,303,421			4,226,712			4,260,953
	Total deposits	$	16,065,246		$	14,668,789		$	14,647,446
	Mix:
	Non-interest bearing	20		%	19		%	18		%
	NOW and interest bearing demand deposits	13			13			13
	Wealth management deposits	8			7			8
	Money market	23			23			23
	Savings	9			9			9
	Time certificates of deposit	27			29			29
	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.

Federal_Home_Loan_Bank_Advance

Federal Home Loan Bank Advances, Other Borrowings and Subordinated Notes	9 Months Ended
	Sep. 30, 2014
Debt Disclosure [Abstract]	'
Federal Home Loan Bank Advances, Other Borrowings and Subordinated Notes	'
	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)	September 30,		31-Dec-13		September 30,
		2014				2013
	Federal Home Loan Bank advances	$	347,500	$	417,762	$	387,852
	Other borrowings:
	Notes payable	—		364		1,546
	Securities sold under repurchase agreements	32,530		235,347		223,211
	Other	18,953		19,393		23,659
	Total other borrowings	51,483		255,104		248,416
	Subordinated notes	140,000		—		10,000
	Total Federal Home Loan Bank advances, other borrowings and subordinated notes	$	538,983	$	672,866	$	646,268
	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 September 30, 2014, the Company had no notes payable outstanding compared to $364,000 outstanding at December 31, 2013 and $1.5 million outstanding at September 30, 2013. In prior periods, notes payable represented an unsecured promissory note to a Great Lakes Advisor shareholder ("Unsecured Promissory Note") assumed by the Company as a result of the respective acquisition in 2013 and a loan agreement ("Agreement") with unaffiliated banks. Under the Unsecured Promissory Note, the Company made quarterly principal payments and paid interest at a rate of the federal funds rate plus 100 basis points. In the second quarter of 2014, the remaining balance of the Unsecured Promissory Note was paid off. At December 31, 2013 and September 30, 2013, this Unsecured Promissory Note had an outstanding balance of $364,000 and $546,000, respectively.
	Additionally, the Company previously had a $101.0 million loan 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. The Company repaid and terminated its $1.0 million term loan at that time. At September 30, 2014, December 31, 2013 and September 30, 2013, no amount was outstanding on the $100.0 million revolving credit facility compared to $1.0 million of the term loan outstanding at September 30, 2013. 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. As more fully described in Note 17 - Subsequent Events, the Company amended the Agreement subsequent to September 30, 2014.
	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 September 30, 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.
	At September 30, 2014, December 31, 2013 and September 30, 2013, securities sold under repurchase agreements represent $32.5 million, $55.3 million and $43.2 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 for the periods ending December 31, 2013 and September 30, 2013. During the second quarter of 2014, the Company paid off the $180.0 million 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 September 30, 2014, the Company had pledged securities related to its customer balances in sweep accounts of $53.4 million, which exceeds 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 September 30, 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 September 30, 2014, the Fixed-rate Promissory Note had an outstanding balance of $19.0 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 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 September 30, 2014, the Company had outstanding subordinated notes totaling $140.0 million. During the second quarter of 2014, the Company issued $140.0 million of subordinated notes receiving $139.1 million in net proceeds. The notes have a stated interest rate of 5.00% and mature in June 2024. At December 31, 2013, the Company had no outstanding subordinated notes and at September 30, 2013, the Company had an obligation for one note issued in October 2005 with a remaining balance of $10.0 million and a maturity in May 2015. In November 2013, this note with the remaining balance of $10.0 million was paid-off prior to maturity. Interest on this note was calculated at a rate equal to three-month LIBOR plus 130 basis points.

Junior_Subordinated_Debentures

Junior Subordinated Debentures

9 Months Ended

Sep. 30, 2014

Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust [Abstract]

'

Junior Subordinated Debentures

'

Junior Subordinated Debentures

As of September 30, 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 September 30, 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 9/30/2014

Date

Date

Redemption

Securities

Debentures

Date

Wintrust Capital Trust III

$

774

$

25,000

$

25,774

L+3.25

3.48

%

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 September 30, 2014, December 31, 2013 and September 30, 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 September 30, 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 September 30, 2014, was 3.11%. 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 September 30, 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	9 Months Ended
	Sep. 30, 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						$ Change in			% Change  in
	(Dollars in thousands)	September 30,			September 30,			Contribution			Contribution
		2014			2013
	Net interest income:
	Community Banking	$	121,998		$	115,199		$	6,799		6	%
	Specialty Finance	21,903			19,327			2,576			13
	Wealth Management	3,877			3,667			210			6
	Total Operating Segments	147,778			138,193			9,585			7
	Intersegment Eliminations	3,892			3,589			303			8
	Consolidated net interest income	$	151,670		$	141,782		$	9,888		7	%
	Non-interest income:
	Community Banking	$	38,274		$	36,659		$	1,615		4	%
	Specialty Finance	8,320			7,821			499			6
	Wealth Management	18,191			16,467			1,724			10
	Total Operating Segments	64,785			60,947			3,838			6
	Intersegment Eliminations	(6,833		)	(6,285		)	(548		)	(9	)
	Consolidated non-interest income	$	57,952		$	54,662		$	3,290		6	%
	Net revenue:
	Community Banking	$	160,272		$	151,858		$	8,414		6	%
	Specialty Finance	30,223			27,148			3,075			11
	Wealth Management	22,068			20,134			1,934			10
	Total Operating Segments	212,563			199,140			13,423			7
	Intersegment Eliminations	(2,941		)	(2,696		)	(245		)	(9	)
	Consolidated net revenue	$	209,622		$	196,444		$	13,178		7	%
	Segment profit:
	Community Banking	$	26,184		$	22,754		$	3,430		15	%
	Specialty Finance	10,973			10,022			951			9
	Wealth Management	3,067			2,787			280			10
	Consolidated net income	$	40,224		$	35,563		$	4,661		13	%
	Segment assets:
	Community Banking	$	15,945,744		$	14,741,147		$	1,204,597		8	%
	Specialty Finance	2,704,591			2,451,727			252,864			10
	Wealth Management	519,010			489,674			29,336			6
	Consolidated total assets	$	19,169,345		$	17,682,548		$	1,486,797		8	%
		Nine months ended						$ Change in			% Change  in
	(Dollars in thousands)	September 30,			September 30,			Contribution			Contribution
		2014			2013
	Net interest income:
	Community Banking	$	359,981		$	332,795		$	27,186		8	%
	Specialty Finance	60,907			54,193			6,714			12
	Wealth Management	11,982			10,395			1,587			15
	Total Operating Segments	432,870			397,383			35,487			9
	Intersegment Eliminations	11,986			10,936			1,050			10
	Consolidated net interest income	$	444,856		$	408,319		$	36,537		9	%
	Non-interest income:
	Community Banking	$	98,930		$	122,625		$	(23,695	)	(19	)%
	Specialty Finance	24,656			23,318			1,338			6
	Wealth Management	54,367			48,591			5,776			12
	Total Operating Segments	177,953			194,534			(16,581		)	(9	)
	Intersegment Eliminations	(20,370		)	(18,498		)	(1,872		)	(10	)
	Consolidated non-interest income	$	157,583		$	176,036		$	(18,453	)	(10	)%
	Net revenue:
	Community Banking	$	458,911		$	455,420		$	3,491		1	%
	Specialty Finance	85,563			77,511			8,052			10
	Wealth Management	66,349			58,986			7,363			12
	Total Operating Segments	610,823			591,917			18,906			3
	Intersegment Eliminations	(8,384		)	(7,562		)	(822		)	(11	)
Consolidated net revenue	$	602,439		$	584,355		$	18,084		3	%
Segment profit:
Community Banking	$	73,393		$	65,728		$	7,665		12	%
Specialty Finance	30,257			28,343			1,914			7
Wealth Management	9,615			7,851			1,764			22
Consolidated net income	$	113,265		$	101,922		$	11,343		11	%

Derivative_Financial_Instrumen

Derivative Financial Instruments	9 Months Ended
	Sep. 30, 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 term (such as a rate, security price or price index) 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 term. 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 held-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 September 30, 2014:
	(Dollars in thousands)
			Notional			Accounting	Fair Value as of
	Effective Date	Maturity Date	Amount			Treatment	30-Sep-14
	3-May-12	3-May-15	77,000			Non-Hedge Designated	—
	3-May-12	3-May-16	215,000			Non-Hedge Designated	205
	1-Jun-12	1-Apr-15	96,530			Non-Hedge Designated	—
	29-Aug-12	29-Aug-16	216,500			Cash Flow Hedging	484
	22-Feb-13	22-Aug-16	56,500			Non-Hedge Designated	165
	22-Feb-13	22-Aug-16	43,500			Cash Flow Hedging	127
	21-Mar-13	21-Mar-17	100,000			Non-Hedge Designated	812
	16-May-13	16-Nov-16	75,000			Non-Hedge Designated	350
	15-Sep-13	15-Sep-17	50,000			Cash Flow Hedging	728
	30-Sep-13	30-Sep-17	40,000			Cash Flow Hedging	608
			$	970,030			$	3,479
	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 through 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 September 30, 2014, December 31, 2013 and September 30, 2013:
		Derivative Assets												Derivative Liabilities
		Fair Value												Fair Value
	(Dollars in thousands)	September 30,				31-Dec-13				September 30,				September 30,				31-Dec-13				September 30,
		2014								2013				2014								2013
	Derivatives designated as hedging instruments under ASC 815:
	Interest rate derivatives designated as Cash Flow Hedges	$	1,947			$	1,776			$	1,738			$	2,202			$	3,160			$	3,444
	Interest rate derivatives designated as Fair Value Hedges	79				107				82				—				1				2
	Total derivatives designated as hedging instruments under ASC 815	$	2,026			$	1,883			$	1,820			$	2,202			$	3,161			$	3,446
	Derivatives not designated as hedging instruments under ASC 815:
	Interest rate derivatives	$	31,249			$	36,073			$	40,125			$	29,249			$	31,646			$	35,358
	Interest rate lock commitments	10,010				7,500				15,599				31				147				5,097
	Forward commitments to sell mortgage loans	41				2,761				23				3,986				2,310				5,373
	Foreign exchange contracts	17				4				6				37				—				26
	Total derivatives not designated as hedging instruments under ASC 815	$	41,317			$	46,338			$	55,753			$	33,303			$	34,103			$	45,854
	Total Derivatives	$	43,343			$	48,221			$	57,573			$	35,505			$	37,264			$	49,300
	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 September 30, 2014, the Company had two interest rate swaps and two 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 nine months ended September 30, 2014 or September 30, 2013. The Company uses the hypothetical derivative method to assess and measure hedge effectiveness.
	The table below provides details on each of these cash flow hedges as of September 30, 2014:
		30-Sep-14
	(Dollars in thousands)	Notional				Fair Value
	Maturity Date	Amount				Asset (Liability)
	Interest Rate Swaps:
	Sep-16	50,000				(1,450		)
	Oct-16	25,000				(752		)
	Total Interest Rate Swaps	75,000				(2,202		)
	Interest Rate Caps:
	Aug-16	43,500				127
	Aug-16	216,500				484
	Sep-17	50,000				728
	Sep-17	40,000				608
	Total Interest Rate Caps	350,000				1,947
	Total Cash Flow Hedges	$	425,000			$	(255	)
	A rollforward of the amounts in accumulated other comprehensive loss related to interest rate derivatives designated as cash flow hedges follows:
		Three months ended								Nine months ended
	(Dollars in thousands)	September 30,				September 30,				September 30,				September 30,
		2014				2013				2014				2013
	Unrealized loss at beginning of period	$	(4,695	)		$	(5,030	)		$	(3,971	)		$	(8,673	)
	Amount reclassified from accumulated other comprehensive loss to interest expense on junior subordinated debentures	553				1,507				1,567				4,629
	Amount of gain/(loss) recognized in other comprehensive income	418				(859		)		(1,320		)		(338		)
	Unrealized loss at end of period	$	(3,724	)		$	(4,382	)		$	(3,724	)		$	(4,382	)
	As of September 30, 2014, the Company estimates that during the next twelve months, $1.8 million will be reclassified from accumulated other comprehensive loss 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 September 30, 2014, the Company has three interest rate swaps with an aggregate notional amount of $5.2 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 no losses in other income related to hedge ineffectiveness for the three months ended September 30, 2014 and 2013, respectively. and a net loss of $3,000 and a net gain of $9,000 for the respective year-to-date periods.
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, the Company has recorded amortization of the basis in the previously hedged item as a reduction to interest income of $43,000 and $129,000 in the three and nine month periods ended September 30, 2014, respectively.
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 September 30, 2014 and 2013:
(Dollars in thousands)	Location of Gain/(Loss)		Amount of Gain/(Loss) Recognized								Amount of Gain/(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								Three Months Ended								Ineffectiveness
																			Three Months Ended
Derivatives in Fair Value
Hedging Relationships			September 30,				September 30,				September 30,				September 30,				September 30,				September 30,
			2014				2013				2014				2013				2014				2013
Interest rate swaps	Trading gains/(losses), net		$	16			$	(14	)		$	(16	)		$	14			$	—			$	—
(Dollars in thousands)	Location of Gain/(Loss)		Amount of Gain/(Loss) Recognized								Amount of Gain/(Loss) Recognized								Income Statement Gain/
	Recognized in Income on		in Income on Derivative								in Income on Hedged Item								(Loss) due to Hedge
	Derivative		Nine Months Ended								Nine Months Ended								Ineffectiveness
																			Nine Months Ended
Derivatives in Fair Value
Hedging Relationships			September 30,				September 30,				September 30,				September 30,				September 30,				September 30,
			2014				2013				2014				2013				2014				2013
Interest rate swaps	Trading gains/(losses), net		$	(27	)		$	42			$	24			$	(33	)		$	(3	)		$	9
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 non-interest income. At September 30, 2014, the Company had interest rate derivative transactions with an aggregate notional amount of approximately $3.0 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 November 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 September 30, 2014, the Company had forward commitments to sell mortgage loans with an aggregate notional amount of approximately $599.2 million and interest rate lock commitments with an aggregate notional amount of approximately $322.7 million. Additionally, the Company’s total mortgage loans held-for-sale at September 30, 2014 was $363.3 million. The fair values of these derivatives were estimated based on changes in mortgage rates from the dates of the commitments. Changes in the fair value of these mortgage banking derivatives are included in mortgage banking revenue.
Foreign Currency Derivatives—These derivatives include foreign currency contracts used to manage the foreign exchange risk associated with foreign currency denominated assets and transactions. Foreign currency contracts, which include spot and forward contracts, represent agreements to exchange the currency of one country for the currency of another country at an agreed-upon price on an agreed-upon settlement date. As a result of fluctuations in foreign currencies, the U.S. dollar-equivalent value of the foreign currency denominated assets or forecasted transactions increase or decrease. Gains or losses on the derivative instruments related to these foreign currency denominated assets or forecasted transactions are expected to substantially offset this variability. As of September 30, 2014 the Company held foreign currency derivatives with an aggregate notional amount of approximately $3.2 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 in non-interest income. There were no covered call options outstanding as of September 30, 2014, December 31, 2013 or September 30, 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 September 30, 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:
(Dollars in thousands)			Three Months Ended								Nine Months Ended
Derivative	Location in income statement		September 30,				September 30,				September 30,				September 30,
			2014				2013				2014				2013
Interest rate swaps and caps	Trading gains (losses), net		$	270			$	(1,738	)		$	(1,144	)		$	1,182
Mortgage banking derivatives	Mortgage banking revenue		(562		)		(6,644		)		(1,770		)		4,352
Covered call options	Fees from covered call options		2,107				285				4,893				2,917
Foreign exchange contracts	Trading gains (losses), net		(12		)		33				(23		)		(34		)
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 September 30, 2014 the fair value of interest rate derivatives in a net liability position, which includes accrued interest related to these agreements, was $25.7 million. If the Company had breached any of these provisions at September 30, 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)	September 30,				31-Dec-13				September 30,				September 30,				31-Dec-13				September 30,
	2014								2013				2014								2013
Gross Amounts Recognized	$	33,275			$	37,956			$	41,945			$	31,451			$	34,807			$	38,804
Less: Amounts offset in the Statements of Financial Condition	—				—				—				—				—				—
Net amount presented in the Statements of Financial Condition	$	33,275			$	37,956			$	41,945			$	31,451			$	34,807			$	38,804
Gross amounts not offset in the Statements of Financial Condition
Offsetting Derivative Positions	(5,417		)		(8,826		)		(6,362		)		(5,417		)		(8,826		)		(6,362		)
Securities Collateral Posted (1)	—				—				—				(26,034		)		(25,981		)		(28,620		)
Net Credit Exposure	$	27,858			$	29,130			$	35,583			$	—			$	—			$	3,822
-1	As of September 30, 2014 and December 31, 2013, the Company posted securities collateral of $33.9 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	9 Months Ended
	Sep. 30, 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 September 30, 2014, the Company classified $50.2 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 southern 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 third 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 September 30, 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 September 30, 2014, the Company held $24.0 million of 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 September 30, 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 1.27%-2.20% with an average of 1.76% 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—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 September 30, 2014, the Company classified $8.1 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 September 30, 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 12.04% used as an input to value the pool of mortgage servicing rights at September 30, 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 credit risk associated with derivative financial instruments that are subject to master netting agreements is measured on a net basis by counterparty portfolio. The fair value for mortgage-related 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.
	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:
		September 30, 2014
	(Dollars in thousands)	Total			Level 1			Level 2			Level 3
	Available-for-sale securities
	U.S. Treasury	$	378,261		$	—		$	378,261		$	—
	U.S. Government agencies	739,752			—			739,752			—
	Municipal	187,103			—			136,866			50,237
	Corporate notes	134,155			—			134,155			—
	Mortgage-backed	291,222			—			291,222			—
	Equity securities	52,155			—			28,194			23,961
	Trading account securities	6,015			—			6,015			—
	Mortgage loans held-for-sale	363,303			—			363,303			—
	Mortgage servicing rights	8,137			—			—			8,137
	Nonqualified deferred compensation assets	7,927			—			7,927			—
	Derivative assets	43,343			—			43,343			—
	Total	$	2,211,373		$	—		$	2,129,038		$	82,335
	Derivative liabilities	$	35,505		$	—		$	35,505		$	—
			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 compensation 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		$	—
		30-Sep-13
	(Dollars in thousands)	Total			Level 1			Level 2			Level 3
	Available-for-sale securities
	U.S. Treasury	$	210,902		$	—		$	210,902		$	—
	U.S. Government agencies	912,689			—			912,689			—
	Municipal	150,647			—			117,959			32,688
	Corporate notes	139,181			—			139,181			—
	Mortgage-backed	319,193			—			319,193			—
	Equity securities	49,271			—			28,829			20,442
	Trading account securities	259			—			259			—
	Mortgage loans held-for-sale	329,186			—			329,186			—
	Mortgage servicing rights	8,608			—			—			8,608
	Nonqualified deferred compensation assets	6,801			—			6,801			—
	Derivative assets	57,573			—			57,573			—
	Total	$	2,184,310		$	—		$	2,122,572		$	61,738
	Derivative liabilities	$	49,300		$	—		$	49,300		$	—
The aggregate remaining contractual principal balance outstanding as of September 30, 2014, December 31, 2013 and September 30, 2013 for mortgage loans held-for-sale measured at fair value under ASC 825 was $340.0 million, $314.9 million and $310.3 million, respectively, while the aggregate fair value of mortgage loans held-for-sale was $363.3 million, $332.5 million and $329.2 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 September 30, 2014, December 31, 2013 and September 30, 2013.
The changes in Level 3 assets measured at fair value on a recurring basis during the three and nine months ended September 30, 2014 and 2013 are summarized as follows:
				Equity securities			Mortgage
(Dollars in thousands)	Municipal						servicing rights
Balance at June 30, 2014	$	38,053		$	24,152		$	8,227
Total net gains (losses) included in:
Net Income (1)	—			—			(90		)
Other comprehensive income	(27		)	(191		)	—
Purchases	4,129			—			—
Issuances	—			—			—
Sales	—			—			—
Settlements	(800		)	—			—
Net transfers into/(out of) Level 3 (2)	8,882			—			—
Balance at September 30, 2014	$	50,237		$	23,961		$	8,137
-1	Changes in the balance of mortgage servicing rights are recorded as a component of mortgage banking revenue in non-interest income.
-2	Transfers into Level 3 relate to a reclassification of municipal bonds in the current quarter.
				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 Income (1)	—			—			(809		)
Other comprehensive income	193			1,798			—
Purchases	9,095			—			—
Issuances	—			—			—
Sales	—			—			—
Settlements	(4,319		)	—			—
Net transfers into/(out of) Level 3 (2)	8,882			—			—
Balance at September 30, 2014	$	50,237		$	23,961		$	8,137
-1	Changes in the balance of mortgage servicing rights are recorded as a component of mortgage banking revenue in non-interest income.
-2	Transfers into Level 3 relate to a reclassification of municipal bonds in the current quarter.
				Equity securities			Mortgage
(Dollars in thousands)	Municipal						servicing rights
Balance at June 30, 2013	$	32,432		$	22,428		$	8,636
Total net gains (losses) included in:
Net Income (1)	—			—			(28		)
Other comprehensive income	(2		)	(1,986		)	—
Purchases	6,225			—			—
Issuances	—			—			—
Sales	—			—			—
Settlements	(5,967		)	—			—
Net transfers into/(out of) Level 3	—			—			—
Balance at September 30, 2013	$	32,688		$	20,442		$	8,608
-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)	—			—			1,858
Other comprehensive income	(316		)	(1,727		)	—
Purchases	8,572			—			—
Issuances	—			—			—
Sales	—			—			—
Settlements	(6,338		)	—			—
Net transfers into/(out of) Level 3	—			—			—
Balance at September 30, 2013	$	32,688		$	20,442		$	8,608
-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 September 30, 2014.
	September 30, 2014												Three Months		Nine Months Ended September 30, 2014 Fair Value Losses Recognized, net
													Ended September 30, 2014
(Dollars in thousands)	Total			Level 1			Level 2			Level 3			Fair Value Losses Recognized, net
Impaired loans—collateral based	$	60,209		$	—		$	—		$	60,209		$	5,786	$	19,483
Other real estate owned, including covered other real estate owned (1)	98,945			—			—			98,945			914		9,847
Total	$	159,154		$	—		$	—		$	159,154		$	6,700	$	29,330
-1	Fair value losses recognized, net 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 September 30, 2014, the Company had $129.5 million of impaired loans classified as Level 3. Of the $129.5 million of impaired loans, $60.2 million were measured at fair value based on the underlying collateral of the loan as shown in the table above. The remaining $69.3 million were valued based on discounted cash flows in accordance with ASC 310.
Other real estate owned (including covered other real estate owned)—Other real estate owned is comprised of real estate acquired in partial or full satisfaction of loans and is included in other assets. Other real estate owned is recorded at its estimated fair value less estimated selling costs at the date of transfer, with any excess of the related loan balance over the fair value less expected selling costs charged to the allowance for loan losses. Subsequent changes in value are reported as adjustments to the carrying amount and are recorded in other non-interest expense. Gains and losses upon sale, if any, are also charged to other non-interest expense. Fair value is generally based on third party appraisals and internal estimates and is therefore considered a Level 3 valuation.
The Company’s Managed Assets Division is primarily responsible for the valuation of Level 3 measurements for non-covered other real estate owned and covered other real estate owned. At September 30, 2014, the Company had $98.9 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 valuation adjustments applied to other real estate owned range from an 81% write-up, to a 100% write-down of the carrying value at September 30, 2014, with a weighted average write-down adjustment of 1.19%. A higher appraisal valuation results in an increased carrying value.
The valuation techniques and significant unobservable inputs used to measure both recurring and non-recurring Level 3 fair value measurements at September 30, 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	$	50,237		Bond pricing		Equivalent rating	BBB-AA+		N/A	Increase
Equity Securities	23,961			Discounted cash flows		Discount rate	1.27%-2.20%		1.76%	Decrease
Mortgage Servicing Rights	8,137			Discounted cash flows		Discount rate	9.5%-13%		9.66%	Decrease
						Constant prepayment rate (CPR)	10%-15%		12.04%	Decrease
Measured at fair value on a non-recurring basis:
Impaired loans—collateral based	$	60,209		Appraisal value		N/A	N/A		N/A	N/A
Other real estate owned, including covered other real estate owned	98,945			Appraisal value		Property specific valuation adjustment	(100)%-81%		-1.19%	Increase
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 September 30, 2014						At December 31, 2013						At September 30, 2013
	Carrying			Fair			Carrying			Fair			Carrying		Fair
(Dollars in thousands)	Value			Value			Value			Value			Value		Value
Financial Assets:
Cash and cash equivalents	$	287,416		$	287,416		$	263,864		$	263,864		$	330,637	$	330,637
Interest bearing deposits with banks	620,370			620,370			495,574			495,574			681,834		681,834
Available-for-sale securities	1,782,648			1,782,648			2,176,290			2,176,290			1,781,883		1,781,883
Trading account securities	6,015			6,015			497			497			259		259
Federal Home Loan Bank and Federal Reserve Bank stock, at cost	80,951			80,951			79,261			79,261			76,755		76,755
Brokerage customer receivables	26,624			26,624			30,953			30,953			29,253		29,253
Mortgage loans held-for-sale, at fair value	363,303			363,303			332,485			332,485			329,186		329,186
Mortgage loans held-for-sale, at lower of cost or market	—			—			1,842			1,857			5,159		5,218
Total loans	14,306,664			15,001,394			13,243,033			13,867,255			12,997,027		13,576,959
Mortgage servicing rights	8,137			8,137			8,946			8,946			8,608		8,608
Nonqualified deferred compensation assets	7,927			7,927			7,222			7,222			6,801		6,801
Derivative assets	43,343			43,343			48,221			48,221			57,573		57,573
FDIC indemnification asset	27,359			27,359			85,672			85,672			100,313		100,313
Accrued interest receivable and other	170,517			170,517			163,732			163,732			165,209		165,209
Total financial assets	$	17,731,274		$	18,426,004		$	16,937,592		$	17,561,829		$	16,570,497	$	17,150,488
Financial Liabilities
Non-maturity deposits	$	11,761,825		$	11,761,825		$	10,442,077		$	10,442,077		$	10,386,493	$	10,386,493
Deposits with stated maturities	4,303,421			4,303,717			4,226,712			4,242,172			4,260,953		4,272,459
Federal Home Loan Bank advances	347,500			352,516			417,762			422,750			387,852		393,602
Other borrowings	51,483			51,483			255,104			255,104			248,416		248,416
Subordinated notes	140,000			142,720			—			—			10,000		10,000
Junior subordinated debentures	249,493			250,452			249,493			250,672			249,493		250,751
Derivative liabilities	35,505			35,505			37,264			37,264			49,300		49,300
Accrued interest payable	8,995			8,995			8,556			8,556			7,758		7,758
Total financial liabilities	$	16,898,222		$	16,907,213		$	15,636,968		$	15,658,595		$	15,600,265	$	15,618,779
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 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 assessed 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.
Subordinated notes. The fair value of the subordinated notes is based on a market price obtained from an independent pricing vendor. In accordance with ASC 820, the Company has categorized subordinated notes as a Level 2 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	9 Months Ended
	Sep. 30, 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 September 30, 2014, assuming all performance-based shares will be issued at the maximum levels, 447,565 shares were available for future grants.
	The Company historically awarded stock-based compensation in the form time-vested 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 nine month periods ending September 30, 2014 and 2013.
		Nine Months Ended		Nine Months Ended
		September 30,		September 30,
		2014		2013
	Expected dividend yield	0.4	%	0.5	%
	Expected volatility	30.8	%	59.1	%
	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 $2.2 million in the third quarter of 2014 and $2.0 million in the third quarter of 2013, and $8.1 million and $6.5 million for the 2014 and 2013 year-to-date periods, respectively. 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 nine months ended September 30, 2014 and September 30, 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	366,478			46.85
	Exercised	(139,928	)		33.9
	Forfeited or canceled	(99,147	)		50.61
	Outstanding at September 30, 2014	1,652,075			$	43.24	3.4		$	8,133
	Exercisable at September 30, 2014	1,050,665			$	43.86	2.1		$	5,851
	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	235,002			37.97
	Exercised	(78,184	)		28.5
	Forfeited or canceled	(45,818	)		45.18
	Outstanding at September 30, 2013	1,856,427			$	42.27	2.4		$	6,786
	Exercisable at September 30, 2013	1,845,560			$	42.32	2.4		$	6,710
	-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 nine months ended September 30, 2014 and September 30, 2013 was $11.96 and $17.49, respectively. The aggregate intrinsic value of options exercised during the nine months ended September 30, 2014 and 2013, was $1.8 million and $777,000, respectively.
	A summary of the Plans' restricted share activity for the nine months ended September 30, 2014 and September 30, 2013 is presented below:
		Nine months ended September 30, 2014					Nine months ended September 30, 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	12,313			46.04		10,617			40.86
	Vested and issued	(51,978	)		35.12		(135,767	)		31.97
	Forfeited	(6,752	)		37.95		(1,236	)		35.02
	Outstanding at September 30	135,105			$	47.09	187,840			$	42.51
	Vested, but not issuable at September 30	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 nine months ended September 30, 2014 and September 30, 2013 is presented below:
		Nine months ended September 30, 2014					Nine months ended September 30, 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	93,535			46.85		105,825			37.87
	Vested and issued	(15,944	)		33.25		—			—
	Forfeited	(89,424	)		33.78		(7,641	)		34.05
	Outstanding at September 30	295,679			$	38.18	312,749			$	33.99
	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. As previously discussed, the Compensation Committee of the Board of Directors of the Company modified the 2011 awards such that 17% of the awards were paid in shares and the remainder in cash. As a result the remaining shares granted in connection with the 2011 awards were canceled and remain available for future use under the Plan. 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	9 Months Ended
	Sep. 30, 2014
Earnings Per Share, Basic and Diluted, Other Disclosures [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 subject to customary anti-dilution adjustments. In the first quarter of 2014, 10 shares of the Series C Preferred Stock were converted at the option of the respective holders into 244 shares of the Company's common 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 exercise 1,643,295 warrant 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. During the third quarter of 2014, certain holders of the interest in the warrant exercised 100,993 warrant shares at the exercise price, which resulted in 51,065 shares of common stock issued. During the second quarter of 2014, certain holders of the interest in the warrant exercised 499,929 warrant shares at the exercise price, which resulted in 259,071 shares of common stock issued. At September 30, 2014, all remaining holders of the interest in the warrant are able to exercise 1,042,373 warrant shares at the stated exercise price.
	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 September 30, 2014.
	Other
	In May 2013, the Company issued 648,286 shares of its common stock in the acquisition of FLB.
	At the July 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 August 21, 2014 to shareholders of record as of August 7, 2014. At the April 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 May 22, 2014 to shareholders of record as of May 8, 2014. 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 (Losses) Gains on Securities				Unrealized				Foreign				Accumulated
						Losses on				Currency				Other
						Derivative				Translation				Comprehensive
						Instruments				Adjustments				(Loss) Income
	Balance at July 1, 2014	$	(24,003	)		$	(2,898	)		$	(7,602	)		$	(34,503	)
	Other comprehensive income (loss) during the period, net of tax, before reclassifications	812				252				(9,685		)		(8,621		)
	Amount reclassified from accumulated other comprehensive income, net of tax	91				333				—				424
	Net other comprehensive income (loss) during the period, net of tax	$	903			$	585			$	(9,685	)		$	(8,197	)
	Balance at September 30, 2014	$	(23,100	)		$	(2,313	)		$	(17,287	)		$	(42,700	)
	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	30,251				(795		)		(10,378		)		19,078
	Amount reclassified from accumulated other comprehensive income, net of tax	314				944				—				1,258
	Net other comprehensive income (loss)during the period, net of tax	$	30,565			$	149			$	(10,378	)		$	20,336
	Balance at September 30, 2014	$	(23,100	)		$	(2,313	)		$	(17,287	)		$	(42,700	)
	Balance at July 1, 2013	$	(41,213	)		$	(3,100	)		$	(4,891	)		$	(49,204	)
	Other comprehensive (loss) income during the period, net of tax, before reclassifications	(1,460		)		(518		)		3,905				1,927
	Amount reclassified from accumulated other comprehensive income, net of tax	(45		)		908				—				863
	Net other comprehensive (loss) income during the period, net of tax	$	(1,505	)		$	390			$	3,905			$	2,790
	Balance at September 30, 2013	$	(42,718	)		$	(2,710	)		$	(986	)		$	(46,414	)
	Balance at January 1, 2013	$	6,710			$	(5,292	)		$	6,293			$	7,711
	Other comprehensive (loss) income during the period, net of tax, before reclassifications	(49,231		)		(206		)		(7,279		)		(56,716		)
	Amount reclassified from accumulated other comprehensive income, net of tax	(197		)		2,788				—				2,591
	Net other comprehensive (loss) income during the period, net of tax	$	(49,428	)		$	2,582			$	(7,279	)		$	(54,125	)
	Balance at September 30, 2013	$	(42,718	)		$	(2,710	)		$	(986	)		$	(46,414	)
		Amount Reclassified from Accumulated Other Comprehensive Income for the
	Details Regarding the Component of Accumulated Other Comprehensive Income	Three months ended								Nine months ended							Impacted Line on the Consolidated Statements of Income
		September 30,								September 30,
		2014				2013				2014				2013
	Accumulated unrealized losses on securities
	Gains included in net income	$	(153	)		$	75			$	(522	)		$	328		(Losses) gains on available-for-sale securities, net
		(153		)		75				(522		)		328			Income before taxes
Tax effect	$	62			$	(30	)		$	208			$	(131	)	Income tax expense
Net of tax	$	(91	)		$	45			$	(314	)		$	197		Net income
Accumulated unrealized losses on derivative instruments
Amount reclassified to interest expense on junior subordinated debentures	$	553			$	1,507			$	1,567			$	4,629		Interest on junior subordinated debentures
	(553		)		(1,507		)		(1,567		)		(4,629		)	Income before taxes
Tax effect	$	220			$	599			$	623			$	1,841		Income tax expense
Net of tax	$	(333	)		$	(908	)		$	(944	)		$	(2,788	)	Net income
Earnings per Share
The following table shows the computation of basic and diluted earnings per share for the periods indicated:
			Three Months Ended								Nine months ended
(In thousands, except per share data)			30-Sep-14				30-Sep-13				30-Sep-14				September 30,
															2013
Net income			$	40,224			$	35,563			$	113,265			$	101,922
Less: Preferred stock dividends and discount accretion			1,581				1,581				4,743				6,814
Net income applicable to common shares—Basic	(A)		38,643				33,982				108,522				95,108
Add: Dividends on convertible preferred stock, if dilutive			1,581				1,581				4,743				6,744
Net income applicable to common shares—Diluted	(B)		40,224				35,563				113,265				101,852
Weighted average common shares outstanding	(C)		46,639				39,331				46,453				37,939
Effect of dilutive potential common shares
Common stock equivalents			1,166				7,346				1,274				7,263
Convertible preferred stock, if dilutive			3,075				3,477				3,075				4,500
Total dilutive potential common shares			4,241				10,823				4,349				11,763
Weighted average common shares and effect of dilutive potential common shares	(D)		50,880				50,154				50,802				49,702
Net income per common share:
Basic	(A/C)		$	0.83			$	0.86			$	2.34			$	2.51
Diluted	(B/D)		$	0.79			$	0.71			$	2.23			$	2.05
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	9 Months Ended
	Sep. 30, 2014
Subsequent Events [Abstract]	'
Subsequent Events	'
	Subsequent Events
	On October 14, 2014, the Company announced the signing of a definitive agreement to acquire Delavan. Delavan is the parent company of Community Bank CBD which operated four banking locations in southeastern Wisconsin. As of June 30, 2014, Community Bank CBD had approximately $142 million in loans and approximately $167 million in deposits.
	On October 27, 2014 the Company entered into an Eighth Amendment Agreement (the “Eighth Amendment”) to the Agreement dated as of October 30, 2009 among the Company and unaffiliated banks. The Eighth Amendment extended the maturity date of the Agreement to December 15, 2014.

Basis_of_Presentation_Policies

Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 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.
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.
Marketable Securities, Available-for-sale Securities, Policy [Policy Text Block]	'
	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.
Loans	'
	Certain premium finance receivables are recorded net of unearned income. The unearned income portions of such premium finance receivables were $44.8 million at September 30, 2014, $41.9 million at December 31, 2013 and $40.6 million at September 30, 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.
Receivables, Policy [Policy Text Block]	'
	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.
Finance, Loan and Lease Receivables, Held-for-investment, Allowance and Nonperforming Loans, Allowance Policy [Policy Text Block]	'
	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.
Loans and Leases Receivable, Nonperforming Loan and Lease, Policy [Policy Text Block]	'
	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.
Impaired Financing Receivable, Policy [Policy Text Block]	'
	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.
	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, 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 at any subsequent re-modification 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 current interest rate represents a market rate at the time of 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.
	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 September 30, 2014 and approximately $2.0 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 September 30, 2014 and 2013, the Company recorded $294,000 and $205,000, respectively, in interest income representing this decrease in impairment. For the nine months ended September 30, 2014 and 2013, the Company recorded $529,000 and $727,000, respectively, in interest income.
Goodwill Impairment Testing	'
	At June 30, 2014, the Company utilized a quantitative approach for its annual goodwill impairment test of the community banking segment and determined that it is not more likely than not that an impairment existed at that time. The annual goodwill impairment tests of the specialty finance and wealth management segments will be conducted at December 31, 2014.
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.
Federal Home Loan Bank Advances, Other Borrowings, and Subordinated Notes	'
	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 amortized to interest expense using the effective-interest method.
	FHLB advances are stated at par value of the debt adjusted for unamortized fair value adjustments recorded in connection with advances acquired through acquisitions.
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.
Segment Reporting, Policy [Policy Text Block]	'
	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.
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 through 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.
	The following table presents the weighted average assumptions used to determine the fair value of options granted in the nine month periods ending September 30, 2014 and 2013.
		Nine Months Ended		Nine Months Ended
		September 30,		September 30,
		2014		2013
	Expected dividend yield	0.4	%	0.5	%
	Expected volatility	30.8	%	59.1	%
	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 $2.2 million in the third quarter of 2014 and $2.0 million in the third quarter of 2013, and $8.1 million and $6.5 million for the 2014 and 2013 year-to-date periods, respectively. 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.
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)	9 Months Ended
	Sep. 30, 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						Nine Months Ended
	(Dollars in thousands)	September 30,			September 30,			September 30,			September 30,
		2014			2013			2014			2013
	Balance at beginning of period	$	46,115		$	137,681		$	85,672		$	208,160
	Additions from acquisitions	—			—			—			—
	Additions from reimbursable expenses	1,584			3,062			4,933			10,922
	Amortization	(1,382		)	(1,763		)	(4,441		)	(5,884		)
	Changes in expected reimbursements from the FDIC for changes in expected credit losses	(12,124		)	(12,742		)	(41,153		)	(65,477		)
	Payments received from the FDIC	(6,834		)	(25,925		)	(17,652		)	(47,408		)
	Balance at end of period	$	27,359		$	100,313		$	27,359		$	100,313

AvailableForSale_Securities_Ta

Available-For-Sale Securities (Tables)	9 Months Ended
	Sep. 30, 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:
		30-Sep-14
	(Dollars in thousands)	Amortized			Gross			Gross			Fair
		Cost			Unrealized			Unrealized			Value
					Gains			Losses
	U.S. Treasury	$	388,873		$	372		$	(10,984	)	$	378,261
	U.S. Government agencies	771,255			3,866			(35,369		)	739,752
	Municipal	184,015			4,969			(1,881		)	187,103
	Corporate notes:
	Financial issuers	129,259			2,252			(1,208		)	130,303
	Other	3,773			79			—			3,852
	Mortgage-backed: (1)
	Mortgage-backed securities	246,354			4,303			(8,938		)	241,719
	Collateralized mortgage obligations	49,909			357			(763		)	49,503
	Equity securities	47,595			4,958			(398		)	52,155
	Total available-for-sale securities	$	1,821,033		$	21,156		$	(59,541	)	$	1,782,648
		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
	Equity securities	50,532			1,493			(497		)	51,528
	Total available-for-sale securities	$	2,265,118		$	11,758		$	(100,586	)	$	2,176,290
		30-Sep-13
		Amortized			Gross			Gross			Fair
		Cost			Unrealized			Unrealized			Value
	(Dollars in thousands)				Gains			Losses
	U.S. Treasury	$	225,190		$	150		$	(14,438	)	$	210,902
	U.S. Government agencies	954,050			2,213			(43,574		)	912,689
	Municipal	152,010			1,983			(3,346		)	150,647
	Corporate notes:
	Financial issuers	132,320			2,252			(2,513		)	132,059
	Other	7,011			126			(15		)	7,122
	Mortgage-backed: (1)
	Mortgage-backed securities	268,166			4,157			(12,861		)	259,462
	Collateralized mortgage obligations	60,001			458			(728		)	59,731
	Equity securities	53,837			1,097			(5,663		)	49,271
	Total available-for-sale securities	$	1,852,585		$	12,436		$	(83,138	)	$	1,781,883
	-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 September 30, 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	$	10,006		$	(3	)	$	189,172		$	(10,981	)	$	199,178	$	(10,984	)
	U.S. Government agencies	13,557			(78		)	447,369			(35,291		)	460,926		(35,369		)
	Municipal	9,029			(113		)	47,937			(1,768		)	56,966		(1,881		)
	Corporate notes:
	Financial issuers	1,318			(3		)	57,982			(1,205		)	59,300		(1,208		)
	Other	—			—			—			—			—		—
	Mortgage-backed:
	Mortgage-backed securities	14,619			(3		)	141,358			(8,935		)	155,977		(8,938		)
	Collateralized mortgage obligations	16,475			(150		)	13,728			(613		)	30,203		(763		)
	Equity securities	—			—			10,399			(398		)	10,399		(398		)
	Total	$	65,004		$	(350	)	$	907,945		$	(59,191	)	$	972,949	$	(59,541	)
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						Nine months ended
	(Dollars in thousands)	September 30,			September 30,			September 30,			September 30,
		2014			2013			2014			2013
	Realized gains	$	179		$	118		$	333		$	434
	Realized losses	(332		)	(43		)	(855		)	(106		)
	Net realized (losses) gains	$	(153	)	$	75		$	(522	)	$	328
	Other than temporary impairment charges	—			—			—			—
	(Losses) gains on available-for-sale securities, net	$	(153	)	$	75		$	(522	)	$	328
	Proceeds from sales of available-for-sale securities	$	382,552		$	45,078		$	578,594		$	129,537
Investments Classified by Contractual Maturity Date	'
	The amortized cost and fair value of securities as of September 30, 2014, December 31, 2013 and September 30, 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:
		30-Sep-14						31-Dec-13						30-Sep-13
	(Dollars in thousands)	Amortized Cost			Fair Value			Amortized Cost			Fair Value			Amortized Cost		Fair Value
	Due in one year or less	$	216,244		$	216,582		$	268,847		$	269,168		$	285,746	$	286,066
	Due in one to five years	309,914			310,917			358,108			358,357			316,076		316,474
	Due in five to ten years	327,505			317,654			350,372			330,020			344,742		328,895
	Due after ten years	623,512			594,118			616,840			561,992			524,017		481,984
	Mortgage-backed	296,263			291,222			620,419			605,225			328,167		319,193
	Equity securities	47,595			52,155			50,532			51,528			53,837		49,271
	Total available-for-sale securities	$	1,821,033		$	1,782,648		$	2,265,118		$	2,176,290		$	1,852,585	$	1,781,883

Loans_Tables

Loans (Tables)	9 Months Ended
	Sep. 30, 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:
		September 30,			December 31,			September 30,
	(Dollars in thousands)	2014			2013			2013
	Balance:
	Commercial	$	3,689,671		$	3,253,687		$	3,109,121
	Commercial real-estate	4,510,375			4,230,035			4,146,110
	Home equity	720,058			719,137			736,620
	Residential real-estate	470,319			434,992			397,707
	Premium finance receivables—commercial	2,377,892			2,167,565			2,150,481
	Premium finance receivables—life insurance	2,134,405			1,923,698			1,869,739
	Consumer and other	149,339			167,488			171,261
	Total loans, net of unearned income, excluding covered loans	$	14,052,059		$	12,896,602		$	12,581,039
	Covered loans	254,605			346,431			415,988
	Total loans	$	14,306,664		$	13,243,033		$	12,997,027
	Mix:
	Commercial	26		%	25		%	24		%
	Commercial real-estate	31			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	15			15			14
	Consumer and other	1			1			2
	Total loans, net of unearned income, excluding covered loans	98		%	97		%	97		%
	Covered loans	2			3			3
	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:
		30-Sep-14						31-Dec-13
		Unpaid			Carrying			Unpaid			Carrying
		Principal						Principal
	(Dollars in thousands)	Balance			Value			Balance			Value
	Bank acquisitions	$	316,682		$	247,678		$	453,944		$	338,517
	Life insurance premium finance loans acquisition	415,458			407,602			437,155			423,906
Activity Related To Accretable Yield Of Loans Acquired With Evidence Of Credit Quality Deterioratio Since Origination	'
	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
		30-Sep-14						30-Sep-13
	(Dollars in thousands)	Bank Acquisitions			Life Insurance			Bank			Life Insurance
					Premium Finance Loans			Acquisitions			Premium
											Finance Loans
	Accretable yield, beginning balance	$	92,102		$	5,179		$	130,856		$	10,287
	Acquisitions	—			—			—			—
	Accretable yield amortized to interest income	(6,722		)	(1,125		)	(9,056		)	(1,943		)
	Accretable yield amortized to indemnification asset (1)	(8,784		)	—			(8,279		)	—
	Reclassification from non-accretable difference (2)	2,584			—			8,703			234
	Increases (decreases) in interest cash flows due to payments and changes in interest rates	4,564			111			(5,194		)	235
	Accretable yield, ending balance (3)	$	83,744		$	4,165		$	117,030		$	8,813
		Nine Months Ended						Nine Months Ended
		30-Sep-14						30-Sep-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	—			—			1,977			—
	Accretable yield amortized to interest income	(24,109		)	(4,329		)	(27,980		)	(6,216		)
	Accretable yield amortized to indemnification asset (1)	(25,593		)	—			(28,891		)	—
	Reclassification from non-accretable difference (2)	29,092			—			44,907			1,241
	(Decreases) increases in interest cash flows due to payments and changes in interest rates	(3,301		)	240			(16,207		)	733
	Accretable yield, ending balance (3)	$	83,744		$	4,165		$	117,030		$	8,813
	-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 September 30, 2014, the Company estimates that the remaining accretable yield balance to be amortized to the indemnification asset for the bank acquisitions is $21.0 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)	9 Months Ended
	Sep. 30, 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 September 30, 2014, December 31, 2013 and September 30, 2013:
	As of September 30, 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	$	10,430			$	—			$	7,333			$	8,559			$	2,044,505			$	2,070,827
	Franchise	—				—				—				1,221				237,079				238,300
	Mortgage warehouse lines of credit	—				—				—				—				121,585				121,585
	Community Advantage—homeowners association	—				—				—				—				99,595				99,595
	Aircraft	—				—				—				—				6,146				6,146
	Asset-based lending	25				—				2,959				1,220				777,723				781,927
	Tax exempt	—				—				—				—				205,150				205,150
	Leases	—				—				—				—				145,439				145,439
	Other	—				—				—				—				11,403				11,403
	PCI - commercial (1)	—				863				64				137				8,235				9,299
	Total commercial	10,455				863				10,356				11,137				3,656,860				3,689,671
	Commercial real-estate:
	Residential construction	—				—				—				—				30,237				30,237
	Commercial construction	425				—				—				—				159,383				159,808
	Land	2,556				—				1,316				2,918				94,449				101,239
	Office	7,366				—				1,696				1,888				688,390				699,340
	Industrial	2,626				—				224				367				624,669				627,886
	Retail	6,205				—				—				4,117				715,568				725,890
	Multi-family	249				—				793				2,319				674,610				677,971
	Mixed use and other	7,936				—				1,468				10,323				1,407,659				1,427,386
	PCI - commercial real-estate (1)	—				14,294				—				5,807				40,517				60,618
	Total commercial real-estate	27,363				14,294				5,497				27,739				4,435,482				4,510,375
	Home equity	5,696				—				1,181				2,597				710,584				720,058
	Residential real estate	15,730				—				670				2,696				448,528				467,624
	PCI - residential real estate (1)	—				930				30				—				1,735				2,695
	Premium finance receivables
	Commercial insurance loans	14,110				7,115				6,279				14,157				2,336,231				2,377,892
	Life insurance loans	—				—				7,533				6,942				1,712,328				1,726,803
	PCI - life insurance loans (1)	—				—				—				—				407,602				407,602
	Consumer and other	426				175				123				1,133				147,482				149,339
	Total loans, net of unearned income, excluding covered loans	$	73,780			$	23,377			$	31,669			$	66,401			$	13,856,832			$	14,052,059
	Covered loans	6,042				26,170				4,289				5,655				212,449				254,605
	Total loans, net of unearned income	$	79,822			$	49,547			$	35,958			$	72,056			$	14,069,281			$	14,306,664
	-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				286				76				1,010				164,979				167,488
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 September 30, 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	$	15,283			$	190			$	3,585			$	15,261			$	1,688,232			$	1,722,551
Franchise	—				—				113				—				213,215				213,328
Mortgage warehouse lines of credit	—				—				—				—				71,383				71,383
Community Advantage—homeowners association	—				—				—				—				90,504				90,504
Aircraft	—				—				—				—				12,601				12,601
Asset-based lending	2,364				—				693				3,926				732,585				739,568
Tax exempt	—				—				—				—				148,103				148,103
Leases	—				—				—				—				101,654				101,654
Other	—				—				—				—				90				90
PCI - commercial (1)	—				265				—				1,642				7,432				9,339
Total commercial	17,647				455				4,391				20,829				3,065,799				3,109,121
Commercial real-estate:
Residential construction	2,049				3,120				1,595				261				33,305				40,330
Commercial construction	7,854				—				—				—				138,234				146,088
Land	4,216				—				—				4,082				100,953				109,251
Office	4,318				—				3,965				1,270				624,967				634,520
Industrial	8,184				—				—				2,419				614,409				625,012
Retail	11,259				—				271				7,422				593,263				612,215
Multi-family	2,603				—				—				4,332				543,690				550,625
Mixed use and other	12,240				269				2,761				15,371				1,339,029				1,369,670
PCI - commercial real-estate (1)	—				9,607				3,380				2,702				42,710				58,399
Total commercial real-estate	52,723				12,996				11,972				37,859				4,030,560				4,146,110
Home equity	10,926				—				2,436				5,887				717,371				736,620
Residential real estate	14,126				—				1,749				2,844				377,489				396,208
PCI - residential real estate (1)	—				447				289				34				729				1,499
Premium finance receivables
Commercial insurance loans	10,132				11,751				5,307				14,628				2,108,663				2,150,481
Life insurance loans	14				592				6,428				—				1,402,822				1,409,856
PCI - life insurance loans (1)	—				—				—				—				459,883				459,883
Consumer and other	1,671				128				416				695				168,351				171,261
Total loans, net of unearned income, excluding covered loans	$	107,239			$	26,369			$	32,988			$	82,776			$	12,331,667			$	12,581,039
Covered loans	8,602				81,430				9,813				9,216				306,927				415,988
Total loans, net of unearned income	$	115,841			$	107,799			$	42,801			$	91,992			$	12,638,594			$	12,997,027
-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 September 30, 2014, December 31, 2013 and September 30, 2013:
		Performing												Non-performing											Total
	(Dollars in thousands)	30-Sep-14				31-Dec-13				30-Sep-13				30-Sep-14				31-Dec-13				30-Sep-13			30-Sep-14			31-Dec-13		30-Sep-13
	Loan Balances:
	Commercial
	Commercial and industrial	$	2,060,397			$	1,826,063			$	1,707,078			$	10,430			$	10,143			$	15,473		$	2,070,827		$	1,836,206	$	1,722,551
	Franchise	238,300				220,383				213,328				—				—				—			238,300			220,383		213,328
	Mortgage warehouse lines of credit	121,585				67,470				71,383				—				—				—			121,585			67,470		71,383
	Community Advantage—homeowners association	99,595				90,894				90,504				—				—				—			99,595			90,894		90,504
	Aircraft	6,146				10,241				12,601				—				—				—			6,146			10,241		12,601
	Asset-based lending	781,902				734,456				737,204				25				637				2,364			781,927			735,093		739,568
	Tax exempt	205,150				161,239				148,103				—				—				—			205,150			161,239		148,103
	Leases	145,439				109,831				101,654				—				—				—			145,439			109,831		101,654
	Other	11,403				11,147				90				—				—				—			11,403			11,147		90
	PCI - commercial (1)	9,299				11,183				9,339				—				—				—			9,299			11,183		9,339
	Total commercial	3,679,216				3,242,907				3,091,284				10,455				10,780				17,837			3,689,671			3,253,687		3,109,121
	Commercial real-estate
	Residential construction	30,237				38,351				35,161				—				149				5,169			30,237			38,500		40,330
	Commercial construction	159,383				129,737				138,234				425				6,969				7,854			159,808			136,706		146,088
	Land	98,683				103,971				105,035				2,556				2,814				4,216			101,239			106,785		109,251
	Office	691,974				632,154				630,202				7,366				10,087				4,318			699,340			642,241		634,520
	Industrial	625,260				628,284				616,828				2,626				5,654				8,184			627,886			633,938		625,012
	Retail	719,685				645,397				600,956				6,205				10,862				11,259			725,890			656,259		612,215
	Multi-family	677,722				564,502				548,022				249				2,035				2,603			677,971			566,537		550,625
	Mixed use and other	1,419,450				1,364,136				1,357,161				7,936				8,318				12,509			1,427,386			1,372,454		1,369,670
	PCI - commercial real-estate(1)	60,618				76,615				58,399				—				—				—			60,618			76,615		58,399
	Total commercial real-estate	4,483,012				4,183,147				4,089,998				27,363				46,888				56,112			4,510,375			4,230,035		4,146,110
	Home equity	714,362				709,066				725,694				5,696				10,071				10,926			720,058			719,137		736,620
	Residential real-estate	451,894				417,151				382,082				15,730				14,974				14,126			467,624			432,125		396,208
	PCI - residential real-estate (1)	2,695				2,867				1,499				—				—				—			2,695			2,867		1,499
	Premium finance receivables
	Commercial insurance loans	2,356,667				2,148,186				2,128,598				21,225				19,379				21,883			2,377,892			2,167,565		2,150,481
	Life insurance loans	1,726,803				1,499,792				1,409,250				—				—				606			1,726,803			1,499,792		1,409,856
	PCI - life insurance loans (1)	407,602				423,906				459,883				—				—				—			407,602			423,906		459,883
	Consumer and other	148,738				166,246				169,490				601				1,242				1,771			149,339			167,488		171,261
	Total loans, net of unearned income, excluding covered loans	$	13,970,989			$	12,793,268			$	12,457,778			$	81,070			$	103,334			$	123,261		$	14,052,059		$	12,896,602	$	12,581,039
	-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 months and nine months ended September 30, 2014 and 2013 is as follows:
	Three months ended September 30, 2014					Commercial Real-estate				Home  Equity				Residential Real-estate				Premium Finance Receivable				Consumer and Other			Total, Excluding Covered Loans
	(Dollars in thousands)	Commercial
	Allowance for credit losses
	Allowance for loan losses at beginning of period	$	26,038			$	40,702			$	13,918			$	3,733			$	6,309			$	1,553		$	92,253
	Other adjustments	(32		)		(265		)		(1		)		(2		)		(35		)		—			(335		)
	Reclassification from allowance for unfunded lending-related commitments	—				62				—				—				—				—			62
	Charge-offs	(832		)		(4,510		)		(748		)		(205		)		(1,557		)		(250		)	(8,102		)
	Recoveries	296				275				99				111				290				42			1,113
	Provision for credit losses	2,442				2,395				(308		)		405				1,260				(166		)	6,028
	Allowance for loan losses at period end	$	27,912			$	38,659			$	12,960			$	4,042			$	6,267			$	1,179		$	91,019
	Allowance for unfunded lending-related commitments at period end	$	—			$	822			$	—			$	—			$	—			$	—		$	822
	Allowance for credit losses at period end	$	27,912			$	39,481			$	12,960			$	4,042			$	6,267			$	1,179		$	91,841
	Individually evaluated for impairment	$	2,296			$	3,507			$	292			$	512			$	—			$	53		$	6,660
	Collectively evaluated for impairment	25,427				35,967				12,668				3,530				6,267				1,103			84,962
	Loans acquired with deteriorated credit quality	189				7				—				—				—				23			219
	Loans at period end
	Individually evaluated for impairment	$	16,568			$	89,201			$	5,922			$	18,383			$	—			$	870		$	130,944
	Collectively evaluated for impairment	3,663,804				4,360,556				714,136				449,241				4,104,695				148,469			13,440,901
	Loans acquired with deteriorated credit quality	9,299				60,618				—				2,695				407,602				—			480,214
	Three months ended September 30, 2013	Commercial				Commercial Real-estate				Home  Equity				Residential Real-estate				Premium Finance Receivable				Consumer and Other			Total, Excluding Covered Loans
	(Dollars in thousands)
	Allowance for credit losses
	Allowance for loan losses at beginning of period	$	28,737			$	51,950			$	14,205			$	4,825			$	5,268			$	1,857		$	106,842
	Other adjustments	(15		)		(193		)		—				(4		)		7				—			(205		)
	Reclassification from allowance for unfunded lending-related commitments	—				284				—				—				—				—			284
	Charge-offs	(3,281		)		(6,982		)		(711		)		(328		)		(1,297		)		(216		)	(12,815		)
	Recoveries	756				272				43				64				316				51			1,502
	Provision for credit losses	2,044				5,488				1,824				700				1,193				331			11,580
	Allowance for loan losses at period end	$	28,241			$	50,819			$	15,361			$	5,257			$	5,487			$	2,023		$	107,188
	Allowance for unfunded lending-related commitments at period end	$	—			$	1,267			$	—			$	—			$	—			$	—		$	1,267
	Allowance for credit losses at period end	$	28,241			$	52,086			$	15,361			$	5,257			$	5,487			$	2,023		$	108,455
	Individually evaluated for impairment	$	5,498			$	5,892			$	2,447			$	886			$	—			$	252		$	14,975
	Collectively evaluated for impairment	22,636				46,080				12,914				4,371				5,487				1,771			93,259
	Loans acquired with deteriorated credit quality	107				114				—				—				—				—			221
	Loans at period end
	Individually evaluated for impairment	$	24,688			$	124,401			$	11,152			$	16,746			$	—			$	1,774		$	178,761
	Collectively evaluated for impairment	3,075,094				3,963,310				725,468				379,462				3,560,337				169,308			11,872,979
	Loans acquired with deteriorated credit quality	9,339				58,399				—				1,499				459,883				179			529,299
	Nine months ended September 30, 2014					Commercial Real-estate				Home  Equity				Residential Real-estate				Premium Finance Receivable				Consumer and Other			Total, Excluding Covered Loans
	(Dollars in thousands)	Commercial
	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	(69		)		(482		)		(3		)		(6		)		(28		)		—			(588		)
	Reclassification to allowance for unfunded lending-related commitments	—				(102		)		—				—				—				—			(102		)
	Charge-offs	(3,864		)		(11,354		)		(3,745		)		(1,120		)		(4,259		)		(636		)	(24,978		)
	Recoveries	883				762				478				316				925				256			3,620
	Provision for credit losses	7,870				1,177				3,619				(256		)		4,046				(311		)	16,145
	Allowance for loan losses at period end	$	27,912			$	38,659			$	12,960			$	4,042			$	6,267			$	1,179		$	91,019
	Allowance for unfunded lending-related commitments at period end	$	—			$	822			$	—			$	—			$	—			$	—		$	822
	Allowance for credit losses at period end	$	27,912			$	39,481			$	12,960			$	4,042			$	6,267			$	1,179		$	91,841
	Nine months ended September 30, 2013					Commercial Real-estate				Home  Equity				Residential Real-estate				Premium Finance Receivable				Consumer and Other			Total, Excluding Covered Loans
	(Dollars in thousands)	Commercial
	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	(19		)		(621		)		—				(98		)		(5		)		—			(743		)
	Reclassification to allowance for unfunded lending-related commitments	—				136				—				—				—				—			136
	Charge-offs	(8,914		)		(25,228		)		(4,893		)		(2,573		)		(3,671		)		(473		)	(45,752		)
	Recoveries	1,319				1,224				376				87				889				221			4,116
	Provision for credit losses	7,061				23,173				7,144				2,281				2,178				243			42,080
	Allowance for loan losses at period end	$	28,241			$	50,819			$	15,361			$	5,257			$	5,487			$	2,023		$	107,188
	Allowance for unfunded lending-related commitments at period end	$	—			$	1,267			$	—			$	—			$	—			$	—		$	1,267
	Allowance for credit losses at period end	$	28,241			$	52,086			$	15,361			$	5,257			$	5,487			$	2,023		$	108,455
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 and nine months ended September 30, 2014 and 2013 is as follows:
		Three Months Ended								Nine Months Ended
		September 30,				September 30,				September 30,				September 30,
	(Dollars in thousands)	2014				2013				2014				2013
	Balance at beginning of period	$	1,667			$	14,429			$	10,092			$	13,454
	Provision for covered loan losses before benefit attributable to FDIC loss share agreements	(818		)		(2,331		)		(8,703		)		515
	Benefit attributable to FDIC loss share agreements	654				1,865				6,962				(412		)
	Net provision for covered loan losses	(164		)		(466		)		(1,741		)		103
	(Decrease) increase in FDIC indemnification asset	(654		)		(1,865		)		(6,962		)		412
	Loans charged-off	(293		)		(3,237		)		(5,346		)		(8,294		)
	Recoveries of loans charged-off	2,099				4,063				6,612				7,249
	Net recoveries (charge-offs)	1,806				826				1,266				(1,045		)
	Balance at end of period	$	2,655			$	12,924			$	2,655			$	12,924
Summary Of Impaired Loans, Including Restructured Loans	'
	A summary of impaired loans, including troubled debt restructurings ("TDRs"), is as follows:
		September 30,				December 31,				September 30,
	(Dollars in thousands)	2014				2013				2013
	Impaired loans (included in non-performing and TDRs):
	Impaired loans with an allowance for loan loss required (1)	$	68,471			$	92,184			$	99,437
	Impaired loans with no allowance for loan loss required	61,066				70,045				76,861
	Total impaired loans (2)	$	129,537			$	162,229			$	176,298
	Allowance for loan losses related to impaired loans	$	6,577			$	8,265			$	14,329
	TDRs	$	83,385			$	107,103			$	115,003
	-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 Nine Months Ended
		As of September 30, 2014												30-Sep-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	$	8,384			$	11,333			$	2,273			$	9,367			$	537
	Franchise	—				—				—				—				—
	Mortgage warehouse lines of credit	—				—				—				—				—
	Community Advantage—homeowners association	—				—				—				—				—
	Aircraft	—				—				—				—				—
	Asset-based lending	—				—				—				—				—
	Tax exempt	—				—				—				—				—
	Leases	—				—				—				—				—
	Other	—				—				—				—				—
	Commercial real-estate
	Residential construction	—				—				—				—				—
	Commercial construction	425				440				195				432				15
	Land	7,502				7,502				40				7,572				193
	Office	8,198				9,671				322				8,493				300
	Industrial	2,567				2,672				151				2,595				92
	Retail	10,861				11,279				921				10,826				362
	Multi-family	2,822				3,335				107				2,847				109
	Mixed use and other	21,172				21,453				1,738				20,891				656
	Home equity	1,438				1,533				292				1,491				42
	Residential real-estate	4,889				4,986				485				4,783				157
	Premium finance receivables
	Commercial insurance	—				—				—				—				—
	Life insurance	—				—				—				—				—
	PCI - life insurance	—				—				—				—				—
	Consumer and other	213				215				53				215				6
	Impaired loans with no related ASC 310 allowance recorded
	Commercial
	Commercial and industrial	$	7,563			$	8,285			$	—			$	7,909			$	306
	Franchise	—				—				—				—				—
	Mortgage warehouse lines of credit	—				—				—				—				—
	Community Advantage—homeowners association	—				—				—				—				—
	Aircraft	—				—				—				—				—
	Asset-based lending	25				1,952				—				108				75
	Tax exempt	—				—				—				—				—
	Leases	—				—				—				—				—
	Other	—				—				—				—				—
	Commercial real-estate
	Residential construction	—				—				—				—				—
	Commercial construction	2,803				2,803				—				2,777				98
	Land	8,101				12,432				—				8,969				538
	Office	5,159				6,359				—				6,679				244
	Industrial	1,903				2,110				—				1,962				76
	Retail	8,095				10,177				—				8,647				342
	Multi-family	—				—				—				—				—
	Mixed use and other	9,042				11,772				—				9,467				445
	Home equity	4,484				6,490				—				4,806				207
	Residential real-estate	13,234				14,953				—				13,291				496
	Premium finance receivables
	Commercial insurance	—				—				—				—				—
	Life insurance	—				—				—				—				—
	PCI - life insurance	—				—				—				—				—
	Consumer and other	657				721				—				665				29
	Total loans, net of unearned income, excluding covered loans	$	129,537			$	152,473			$	6,577			$	134,792			$	5,325
														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 Nine Months Ended
	As of September 30, 2013												30-Sep-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	$	10,599			$	12,226			$	3,915			$	11,155			$	558
Franchise	—				—				—				—				—
Mortgage warehouse lines of credit	—				—				—				—				—
Community Advantage—homeowners association	—				—				—				—				—
Aircraft	—				—				—				—				—
Asset-based lending	2,287				2,296				1,549				2,299				86
Tax exempt	—				—				—				—				—
Leases	—				—				—				—				—
Other	—				—				—				—				—
Commercial real-estate
Residential construction	377				377				49				379				19
Commercial construction	9,577				9,577				103				10,051				284
Land	12,161				15,486				947				12,321				445
Office	7,322				7,376				111				7,426				207
Industrial	3,352				3,417				177				3,402				124
Retail	18,583				18,662				1,942				18,859				564
Multi-family	3,715				4,188				260				3,809				143
Mixed use and other	19,451				19,711				1,721				18,569				669
Home equity	5,347				5,559				2,447				5,468				187
Residential real-estate	5,999				6,533				856				5,418				170
Premium finance receivables
Commercial insurance	—				—				—				—				—
Life insurance	—				—				—				—				—
Purchased life insurance	—				—				—				—				—
Consumer and other	667				668				252				661				25
Impaired loans with no related ASC 310 allowance recorded
Commercial
Commercial and industrial	$	10,858			$	15,320			$	—			$	13,841			$	683
Franchise	—				—				—				—				—
Mortgage warehouse lines of credit	—				—				—				—				—
Community Advantage—homeowners association	—				—				—				—				—
Aircraft	—				—				—				—				—
Asset-based lending	76				1,416				—				87				57
Tax exempt	—				—				—				—				—
Leases	—				—				—				—				—
Other	—				—				—				—				—
Commercial real-estate
Residential construction	3,267				3,426				—				3,954				122
Commercial construction	8,705				13,939				—				10,899				564
Land	4,980				6,094				—				3,869				181
Office	7,329				9,324				—				8,242				358
Industrial	7,668				7,833				—				7,772				357
Retail	6,230				6,549				—				6,270				257
Multi-family	1,149				2,983				—				1,868				115
Mixed use and other	9,205				11,256				—				8,181				362
Home equity	5,805				7,215				—				5,568				221
Residential real-estate	10,482				12,841				—				9,805				292
Premium finance receivables
Commercial insurance	—				—				—				—				—
Life insurance	—				—				—				—				—
Purchased life insurance	—				—				—				—				—
Consumer and other	1,107				1,652				—				1,128				79
Total loans, net of unearned income, excluding covered loans	$	176,298			$	205,924			$	14,329			$	181,301			$	7,129
Summary Of The Post-Modificatiopn Balance Of Loans Restructured	'
	Nine months ended		Total (1)(2)							Extension at							Reduction of Interest							Modification to					Forgiveness of Debt(2)
	30-Sep-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
	Commercial construction		—			—				—			—				—			—				—		—			—	—
	Land		—			—				—			—				—			—				—		—			—	—
	Office		1			790				1			790				—			—				—		—			—	—
	Industrial		1			1,078				1			1,078				—			—				1		1,078			—	—
	Retail		1			202				1			202				—			—				—		—			—	—
	Multi-family		1			181				—			—				1			181				—		—			—	—
	Mixed use and other		7			4,926				3			2,837				7			4,926				1		1,273			—	—
	Residential real estate and other		4			887				3			676				3			667				1		220			—	—
	Total loans		16			$	8,152			10			$	5,671			11			$	5,774			4		$	2,659		—	$	—
	Nine months ended		Total (1)(2)							Extension at							Reduction of Interest							Modification to					Forgiveness of Debt(2)
	30-Sep-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
	Commercial construction		3			6,120				3			6,120				—			—				3		6,120			—	—
	Land		3			2,639				3			2,639				2			287				—		—			1	73
	Office		4			4,021				4			4,021				1			556				—		—			—	—
	Industrial		1			949				1			949				1			949				—		—			—	—
	Retail		1			200				1			200				1			200				—		—			—	—
	Multi-family		1			705				1			705				1			705				—		—			—	—
	Mixed use and other		3			3,628				3			3,628				2			3,533				—		—			—	—
	Residential real estate and other		8			1,778				4			1,095				6			762				2		234			1	1,000
	Total loans		30			$	20,748			25			$	19,930			18			$	7,545			7		$	6,539		2	$	1,073
	-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.
	The tables below present a summary of the post-modification balance of loans restructured during the three months ended September 30, 2014 and 2013, respectively, which represent TDRs:
	Three months ended		Total (1)(2)							Extension at							Reduction of Interest							Modification to					Forgiveness of Debt(2)
	30-Sep-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		—			$	—			—			$	—			—			$	—			—		$	—		—	$	—
	Commercial real-estate
	Commercial construction		—			—				—			—				—			—				—		—			—	—
	Land		—			—				—			—				—			—				—		—			—	—
	Office		—			—				—			—				—			—				—		—			—	—
	Industrial		—			—				—			—				—			—				—		—			—	—
	Retail		—			—				—			—				—			—				—		—			—	—
	Multi-family		—			—				—			—				—			—				—		—			—	—
	Mixed use and other		—			—				—			—				—			—				—		—			—	—
	Residential real estate and other		3			667				2			456				3			667				—		—			—	—
	Total loans		3			$	667			2			$	456			3			$	667			—		$	—		—	$	—
	Three months ended		Total (1)(2)							Extension at							Reduction of Interest							Modification to					Forgiveness of Debt(2)
	30-Sep-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		—			$	—			—			$	—			—			$	—			—		$	—		—	$	—
	Commercial real-estate
	Commercial construction		—			—				—			—				—			—				—		—			—	—
	Land		1			2,352				1			2,352				—			—				—		—			—	—
	Office		1			556				1			556				1			556				—		—			—	—
	Industrial		—			—				—			—				—			—				—		—			—	—
	Retail		—			—				—			—				—			—				—		—			—	—
Multi-family		—			—				—			—				—			—				—		—			—	—
Mixed use and other		1			95				1			95				—			—				—		—			—	—
Residential real estate and other		1			1,000				1			1,000				—			—				—		—			1	1,000
Total loans		4			$	4,003			4			$	4,003			1			$	556			—		$	—		1	$	1,000
-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 September 30, 2014 and 2013, and such loans which were in payment default under the restructured terms during the respective periods below:
	(Dollars in thousands)	As of September 30, 2014							Three Months Ended							Nine Months Ended
									September 30, 2014							30-Sep-14
		Total (1)(3)							Payments in Default  (2)(3)							Payments in Default  (2)(3)
		Count			Balance				Count			Balance				Count			Balance
	Commercial
	Commercial and industrial	1			$	88			1			$	88			1			$	88
	Commercial real-estate
	Commercial construction	—			—				—			—				—			—
	Land	—			—				—			—				—			—
	Office	1			790				—			—				—			—
	Industrial	1			1,078				1			1,078				1			1,078
	Retail	1			202				—			—				—			—
	Multi-family	1			181				—			—				—			—
	Mixed use and other	10			6,341				2			482				2			482
	Residential real estate and other	6			1,406				2			380				2			380
	Total loans	21			$	10,086			6			$	2,028			6			$	2,028
	-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.
	(Dollars in thousands)	As of September 30, 2013							Three Months Ended							Nine Months Ended
									September 30, 2013							30-Sep-13
		Total (1)(3)							Payments in Default  (2)(3)							Payments in Default  (2)(3)
		Count			Balance				Count			Balance				Count			Balance
	Commercial
	Commercial and industrial	8			$	1,694			1			$	161			2			$	181
	Commercial real-estate
	Commercial construction	3			6,120				—			—				—			—
	Land	3			2,639				1			215				1			215
	Office	4			4,021				1			1,648				1			1,648
	Industrial	2			1,676				1			727				1			727
	Retail	2			431				—			—				—			—
	Multi-family	1			705				—			—				1			705
	Mixed use and other	5			4,217				1			95				2			368
	Residential real estate and other	9			1,904				1			126				1			126
	Total loans	37			$	23,407			6			$	2,972			9			$	3,970
	-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)	9 Months Ended
	Sep. 30, 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			September 30,
		2014			Acquired			Loss						2014
	Community banking	$	305,313		$	26,439		$	—		$	—		$	331,752
	Specialty finance	37,370			6,545			—			(1,177		)	42,738
	Wealth management	31,864			250			—			—			32,114
	Total	$	374,547		$	33,234		$	—		$	(1,177	)	$	406,604
Summary Of Finite-Lived Intangible Assets	'
	A summary of finite-lived intangible assets as of the dates shown and the expected amortization as of September 30, 2014 is as follows:
	(Dollars in thousands)	September 30,			31-Dec-13			September 30,
		2014						2013
	Community banking segment:
	Core deposit intangibles:
	Gross carrying amount	$	40,438		$	40,770		$	39,350
	Accumulated amortization	(27,909		)	(29,189		)	(28,143		)
	Net carrying amount	$	12,529		$	11,581		$	11,207
	Specialty finance segment:
	Customer list intangibles:
	Gross carrying amount	$	1,800		$	1,800		$	1,800
	Accumulated amortization	(910		)	(805		)	(769		)
	Net carrying amount	$	890		$	995		$	1,031
	Wealth management segment:
	Customer list and other intangibles:
	Gross carrying amount	$	7,940		$	7,690		$	7,690
	Accumulated amortization	(1,375		)	(1,053		)	(946		)
	Net carrying amount	$	6,565		$	6,637		$	6,744
	Total other intangible assets, net	$	19,984		$	19,213		$	18,982
Estimated Amortization	'
	Estimated amortization
	Actual in nine months ended September 30, 2014	$	3,521
	Estimated remaining in 2014	1,171
	Estimated—2015	3,519
	Estimated—2016	2,833
	Estimated—2017	2,346
	Estimated—2018	2,052

Deposits_Tables

Deposits (Tables)	9 Months Ended
	Sep. 30, 2014
Deposits [Abstract]	'
Summary Of Deposits	'
	The following table is a summary of deposits as of the dates shown:
	(Dollars in thousands)	September 30,			December 31, 2013			September 30,
		2014						2013
	Balance:
	Non-interest bearing	$	3,253,477		$	2,721,771		$	2,622,518
	NOW and interest bearing demand deposits	2,086,099			1,953,882			1,922,906
	Wealth management deposits	1,212,317			1,013,850			1,099,509
	Money market	3,744,682			3,359,999			3,423,413
	Savings	1,465,250			1,392,575			1,318,147
	Time certificates of deposit	4,303,421			4,226,712			4,260,953
	Total deposits	$	16,065,246		$	14,668,789		$	14,647,446
	Mix:
	Non-interest bearing	20		%	19		%	18		%
	NOW and interest bearing demand deposits	13			13			13
	Wealth management deposits	8			7			8
	Money market	23			23			23
	Savings	9			9			9
	Time certificates of deposit	27			29			29
	Total deposits	100		%	100		%	100		%

Federal_Home_Loan_Bank_Advance1

Federal Home Loan Bank Advances, Other Borrowings and Subordinated Notes (Tables)	9 Months Ended
	Sep. 30, 2014
Debt Disclosure [Abstract]	'
Summary Of 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)	September 30,		31-Dec-13		September 30,
		2014				2013
	Federal Home Loan Bank advances	$	347,500	$	417,762	$	387,852
	Other borrowings:
	Notes payable	—		364		1,546
	Securities sold under repurchase agreements	32,530		235,347		223,211
	Other	18,953		19,393		23,659
	Total other borrowings	51,483		255,104		248,416
	Subordinated notes	140,000		—		10,000
	Total Federal Home Loan Bank advances, other borrowings and subordinated notes	$	538,983	$	672,866	$	646,268

Junior_Subordinated_Debentures1

Junior Subordinated Debentures (Tables)	9 Months Ended
	Sep. 30, 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 September 30, 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 9/30/2014		Date	Date	Redemption
				Securities		Debentures							Date
	Wintrust Capital Trust III	$	774	$	25,000	$	25,774	L+3.25	3.48	%	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)	9 Months Ended
	Sep. 30, 2014
Segment Reporting [Abstract]	'
Segment Information	'
	The following is a summary of certain operating information for reportable segments:
		Three months ended						$ Change in			% Change  in
	(Dollars in thousands)	September 30,			September 30,			Contribution			Contribution
		2014			2013
	Net interest income:
	Community Banking	$	121,998		$	115,199		$	6,799		6	%
	Specialty Finance	21,903			19,327			2,576			13
	Wealth Management	3,877			3,667			210			6
	Total Operating Segments	147,778			138,193			9,585			7
	Intersegment Eliminations	3,892			3,589			303			8
	Consolidated net interest income	$	151,670		$	141,782		$	9,888		7	%
	Non-interest income:
	Community Banking	$	38,274		$	36,659		$	1,615		4	%
	Specialty Finance	8,320			7,821			499			6
	Wealth Management	18,191			16,467			1,724			10
	Total Operating Segments	64,785			60,947			3,838			6
	Intersegment Eliminations	(6,833		)	(6,285		)	(548		)	(9	)
	Consolidated non-interest income	$	57,952		$	54,662		$	3,290		6	%
	Net revenue:
	Community Banking	$	160,272		$	151,858		$	8,414		6	%
	Specialty Finance	30,223			27,148			3,075			11
	Wealth Management	22,068			20,134			1,934			10
	Total Operating Segments	212,563			199,140			13,423			7
	Intersegment Eliminations	(2,941		)	(2,696		)	(245		)	(9	)
	Consolidated net revenue	$	209,622		$	196,444		$	13,178		7	%
	Segment profit:
	Community Banking	$	26,184		$	22,754		$	3,430		15	%
	Specialty Finance	10,973			10,022			951			9
	Wealth Management	3,067			2,787			280			10
	Consolidated net income	$	40,224		$	35,563		$	4,661		13	%
	Segment assets:
	Community Banking	$	15,945,744		$	14,741,147		$	1,204,597		8	%
	Specialty Finance	2,704,591			2,451,727			252,864			10
	Wealth Management	519,010			489,674			29,336			6
	Consolidated total assets	$	19,169,345		$	17,682,548		$	1,486,797		8	%
		Nine months ended						$ Change in			% Change  in
	(Dollars in thousands)	September 30,			September 30,			Contribution			Contribution
		2014			2013
	Net interest income:
	Community Banking	$	359,981		$	332,795		$	27,186		8	%
	Specialty Finance	60,907			54,193			6,714			12
	Wealth Management	11,982			10,395			1,587			15
	Total Operating Segments	432,870			397,383			35,487			9
	Intersegment Eliminations	11,986			10,936			1,050			10
	Consolidated net interest income	$	444,856		$	408,319		$	36,537		9	%
	Non-interest income:
	Community Banking	$	98,930		$	122,625		$	(23,695	)	(19	)%
	Specialty Finance	24,656			23,318			1,338			6
	Wealth Management	54,367			48,591			5,776			12
	Total Operating Segments	177,953			194,534			(16,581		)	(9	)
	Intersegment Eliminations	(20,370		)	(18,498		)	(1,872		)	(10	)
	Consolidated non-interest income	$	157,583		$	176,036		$	(18,453	)	(10	)%
	Net revenue:
	Community Banking	$	458,911		$	455,420		$	3,491		1	%
	Specialty Finance	85,563			77,511			8,052			10
	Wealth Management	66,349			58,986			7,363			12
	Total Operating Segments	610,823			591,917			18,906			3
	Intersegment Eliminations	(8,384		)	(7,562		)	(822		)	(11	)
	Consolidated net revenue	$	602,439		$	584,355		$	18,084		3	%
	Segment profit:
	Community Banking	$	73,393		$	65,728		$	7,665		12	%
	Specialty Finance	30,257			28,343			1,914			7
	Wealth Management	9,615			7,851			1,764			22
Consolidated net income	$	113,265		$	101,922		$	11,343		11	%

Derivative_Financial_Instrumen1

Derivative Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 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 September 30, 2014:
	(Dollars in thousands)
			Notional			Accounting	Fair Value as of
	Effective Date	Maturity Date	Amount			Treatment	30-Sep-14
	3-May-12	3-May-15	77,000			Non-Hedge Designated	—
	3-May-12	3-May-16	215,000			Non-Hedge Designated	205
	1-Jun-12	1-Apr-15	96,530			Non-Hedge Designated	—
	29-Aug-12	29-Aug-16	216,500			Cash Flow Hedging	484
	22-Feb-13	22-Aug-16	56,500			Non-Hedge Designated	165
	22-Feb-13	22-Aug-16	43,500			Cash Flow Hedging	127
	21-Mar-13	21-Mar-17	100,000			Non-Hedge Designated	812
	16-May-13	16-Nov-16	75,000			Non-Hedge Designated	350
	15-Sep-13	15-Sep-17	50,000			Cash Flow Hedging	728
	30-Sep-13	30-Sep-17	40,000			Cash Flow Hedging	608
			$	970,030			$	3,479
Schedule Of Fair Value Of Derivative Financial Instruments	'
	The table below presents the fair value of the Company’s derivative financial instruments as of September 30, 2014, December 31, 2013 and September 30, 2013:
		Derivative Assets												Derivative Liabilities
		Fair Value												Fair Value
	(Dollars in thousands)	September 30,				31-Dec-13				September 30,				September 30,				31-Dec-13				September 30,
		2014								2013				2014								2013
	Derivatives designated as hedging instruments under ASC 815:
	Interest rate derivatives designated as Cash Flow Hedges	$	1,947			$	1,776			$	1,738			$	2,202			$	3,160			$	3,444
	Interest rate derivatives designated as Fair Value Hedges	79				107				82				—				1				2
	Total derivatives designated as hedging instruments under ASC 815	$	2,026			$	1,883			$	1,820			$	2,202			$	3,161			$	3,446
	Derivatives not designated as hedging instruments under ASC 815:
	Interest rate derivatives	$	31,249			$	36,073			$	40,125			$	29,249			$	31,646			$	35,358
	Interest rate lock commitments	10,010				7,500				15,599				31				147				5,097
	Forward commitments to sell mortgage loans	41				2,761				23				3,986				2,310				5,373
	Foreign exchange contracts	17				4				6				37				—				26
	Total derivatives not designated as hedging instruments under ASC 815	$	41,317			$	46,338			$	55,753			$	33,303			$	34,103			$	45,854
	Total Derivatives	$	43,343			$	48,221			$	57,573			$	35,505			$	37,264			$	49,300
Schedule Of Cash Flow Hedging Instruments	'
	The table below provides details on each of these cash flow hedges as of September 30, 2014:
		30-Sep-14
	(Dollars in thousands)	Notional				Fair Value
	Maturity Date	Amount				Asset (Liability)
	Interest Rate Swaps:
	Sep-16	50,000				(1,450		)
	Oct-16	25,000				(752		)
	Total Interest Rate Swaps	75,000				(2,202		)
	Interest Rate Caps:
	Aug-16	43,500				127
	Aug-16	216,500				484
	Sep-17	50,000				728
	Sep-17	40,000				608
	Total Interest Rate Caps	350,000				1,947
	Total Cash Flow Hedges	$	425,000			$	(255	)
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 loss related to interest rate derivatives designated as cash flow hedges follows:
		Three months ended								Nine months ended
	(Dollars in thousands)	September 30,				September 30,				September 30,				September 30,
		2014				2013				2014				2013
	Unrealized loss at beginning of period	$	(4,695	)		$	(5,030	)		$	(3,971	)		$	(8,673	)
	Amount reclassified from accumulated other comprehensive loss to interest expense on junior subordinated debentures	553				1,507				1,567				4,629
	Amount of gain/(loss) recognized in other comprehensive income	418				(859		)		(1,320		)		(338		)
	Unrealized loss at end of period	$	(3,724	)		$	(4,382	)		$	(3,724	)		$	(4,382	)
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 September 30, 2014 and 2013:
	(Dollars in thousands)	Location of Gain/(Loss)		Amount of Gain/(Loss) Recognized								Amount of Gain/(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								Three Months Ended								Ineffectiveness
																				Three Months Ended
	Derivatives in Fair Value
	Hedging Relationships			September 30,				September 30,				September 30,				September 30,				September 30,				September 30,
				2014				2013				2014				2013				2014				2013
	Interest rate swaps	Trading gains/(losses), net		$	16			$	(14	)		$	(16	)		$	14			$	—			$	—
	(Dollars in thousands)	Location of Gain/(Loss)		Amount of Gain/(Loss) Recognized								Amount of Gain/(Loss) Recognized								Income Statement Gain/
		Recognized in Income on		in Income on Derivative								in Income on Hedged Item								(Loss) due to Hedge
		Derivative		Nine Months Ended								Nine Months Ended								Ineffectiveness
																				Nine Months Ended
	Derivatives in Fair Value
	Hedging Relationships			September 30,				September 30,				September 30,				September 30,				September 30,				September 30,
				2014				2013				2014				2013				2014				2013
	Interest rate swaps	Trading gains/(losses), net		$	(27	)		$	42			$	24			$	(33	)		$	(3	)		$	9
Summary Amounts Included In Consolidated Statement Of Income Related To Derivatives	'
	Amounts included in the Consolidated Statements of Income related to derivative instruments not designated in hedge relationships were as follows:
	(Dollars in thousands)			Three Months Ended								Nine Months Ended
	Derivative	Location in income statement		September 30,				September 30,				September 30,				September 30,
				2014				2013				2014				2013
	Interest rate swaps and caps	Trading gains (losses), net		$	270			$	(1,738	)		$	(1,144	)		$	1,182
	Mortgage banking derivatives	Mortgage banking revenue		(562		)		(6,644		)		(1,770		)		4,352
	Covered call options	Fees from covered call options		2,107				285				4,893				2,917
	Foreign exchange contracts	Trading gains (losses), net		(12		)		33				(23		)		(34		)
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)	September 30,				31-Dec-13				September 30,				September 30,				31-Dec-13				September 30,
		2014								2013				2014								2013
	Gross Amounts Recognized	$	33,275			$	37,956			$	41,945			$	31,451			$	34,807			$	38,804
	Less: Amounts offset in the Statements of Financial Condition	—				—				—				—				—				—
	Net amount presented in the Statements of Financial Condition	$	33,275			$	37,956			$	41,945			$	31,451			$	34,807			$	38,804
	Gross amounts not offset in the Statements of Financial Condition
	Offsetting Derivative Positions	(5,417		)		(8,826		)		(6,362		)		(5,417		)		(8,826		)		(6,362		)
	Securities Collateral Posted (1)	—				—				—				(26,034		)		(25,981		)		(28,620		)
	Net Credit Exposure	$	27,858			$	29,130			$	35,583			$	—			$	—			$	3,822
	-1	As of September 30, 2014 and December 31, 2013, the Company posted securities collateral of $33.9 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)	9 Months Ended
	Sep. 30, 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:
		September 30, 2014
	(Dollars in thousands)	Total			Level 1			Level 2			Level 3
	Available-for-sale securities
	U.S. Treasury	$	378,261		$	—		$	378,261		$	—
	U.S. Government agencies	739,752			—			739,752			—
	Municipal	187,103			—			136,866			50,237
	Corporate notes	134,155			—			134,155			—
	Mortgage-backed	291,222			—			291,222			—
	Equity securities	52,155			—			28,194			23,961
	Trading account securities	6,015			—			6,015			—
	Mortgage loans held-for-sale	363,303			—			363,303			—
	Mortgage servicing rights	8,137			—			—			8,137
	Nonqualified deferred compensation assets	7,927			—			7,927			—
	Derivative assets	43,343			—			43,343			—
	Total	$	2,211,373		$	—		$	2,129,038		$	82,335
	Derivative liabilities	$	35,505		$	—		$	35,505		$	—
			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 compensation 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		$	—
		30-Sep-13
	(Dollars in thousands)	Total			Level 1			Level 2			Level 3
	Available-for-sale securities
	U.S. Treasury	$	210,902		$	—		$	210,902		$	—
	U.S. Government agencies	912,689			—			912,689			—
	Municipal	150,647			—			117,959			32,688
	Corporate notes	139,181			—			139,181			—
	Mortgage-backed	319,193			—			319,193			—
	Equity securities	49,271			—			28,829			20,442
	Trading account securities	259			—			259			—
	Mortgage loans held-for-sale	329,186			—			329,186			—
	Mortgage servicing rights	8,608			—			—			8,608
	Nonqualified deferred compensation assets	6,801			—			6,801			—
	Derivative assets	57,573			—			57,573			—
	Total	$	2,184,310		$	—		$	2,122,572		$	61,738
	Derivative liabilities	$	49,300		$	—		$	49,300		$	—
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 and nine months ended September 30, 2014 and 2013 are summarized as follows:
					Equity securities			Mortgage
	(Dollars in thousands)	Municipal						servicing rights
	Balance at June 30, 2014	$	38,053		$	24,152		$	8,227
	Total net gains (losses) included in:
	Net Income (1)	—			—			(90		)
	Other comprehensive income	(27		)	(191		)	—
	Purchases	4,129			—			—
	Issuances	—			—			—
	Sales	—			—			—
	Settlements	(800		)	—			—
	Net transfers into/(out of) Level 3 (2)	8,882			—			—
	Balance at September 30, 2014	$	50,237		$	23,961		$	8,137
	-1	Changes in the balance of mortgage servicing rights are recorded as a component of mortgage banking revenue in non-interest income.
	-2	Transfers into Level 3 relate to a reclassification of municipal bonds in the current quarter.
					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 Income (1)	—			—			(809		)
	Other comprehensive income	193			1,798			—
	Purchases	9,095			—			—
	Issuances	—			—			—
	Sales	—			—			—
	Settlements	(4,319		)	—			—
	Net transfers into/(out of) Level 3 (2)	8,882			—			—
	Balance at September 30, 2014	$	50,237		$	23,961		$	8,137
	-1	Changes in the balance of mortgage servicing rights are recorded as a component of mortgage banking revenue in non-interest income.
	-2	Transfers into Level 3 relate to a reclassification of municipal bonds in the current quarter.
					Equity securities			Mortgage
	(Dollars in thousands)	Municipal						servicing rights
	Balance at June 30, 2013	$	32,432		$	22,428		$	8,636
	Total net gains (losses) included in:
	Net Income (1)	—			—			(28		)
	Other comprehensive income	(2		)	(1,986		)	—
	Purchases	6,225			—			—
	Issuances	—			—			—
	Sales	—			—			—
	Settlements	(5,967		)	—			—
	Net transfers into/(out of) Level 3	—			—			—
	Balance at September 30, 2013	$	32,688		$	20,442		$	8,608
	-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)	—			—			1,858
	Other comprehensive income	(316		)	(1,727		)	—
	Purchases	8,572			—			—
	Issuances	—			—			—
	Sales	—			—			—
	Settlements	(6,338		)	—			—
	Net transfers into/(out of) Level 3	—			—			—
	Balance at September 30, 2013	$	32,688		$	20,442		$	8,608
	-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 September 30, 2014.
		September 30, 2014												Three Months		Nine Months Ended September 30, 2014 Fair Value Losses Recognized, net
														Ended September 30, 2014
	(Dollars in thousands)	Total			Level 1			Level 2			Level 3			Fair Value Losses Recognized, net
	Impaired loans—collateral based	$	60,209		$	—		$	—		$	60,209		$	5,786	$	19,483
	Other real estate owned, including covered other real estate owned (1)	98,945			—			—			98,945			914		9,847
	Total	$	159,154		$	—		$	—		$	159,154		$	6,700	$	29,330
	-1	Fair value losses recognized, net 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 September 30, 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	$	50,237		Bond pricing		Equivalent rating	BBB-AA+		N/A	Increase
	Equity Securities	23,961			Discounted cash flows		Discount rate	1.27%-2.20%		1.76%	Decrease
	Mortgage Servicing Rights	8,137			Discounted cash flows		Discount rate	9.5%-13%		9.66%	Decrease
							Constant prepayment rate (CPR)	10%-15%		12.04%	Decrease
	Measured at fair value on a non-recurring basis:
	Impaired loans—collateral based	$	60,209		Appraisal value		N/A	N/A		N/A	N/A
	Other real estate owned, including covered other real estate owned	98,945			Appraisal value		Property specific valuation adjustment	(100)%-81%		-1.19%	Increase
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 September 30, 2014						At December 31, 2013						At September 30, 2013
		Carrying			Fair			Carrying			Fair			Carrying		Fair
	(Dollars in thousands)	Value			Value			Value			Value			Value		Value
	Financial Assets:
	Cash and cash equivalents	$	287,416		$	287,416		$	263,864		$	263,864		$	330,637	$	330,637
	Interest bearing deposits with banks	620,370			620,370			495,574			495,574			681,834		681,834
	Available-for-sale securities	1,782,648			1,782,648			2,176,290			2,176,290			1,781,883		1,781,883
	Trading account securities	6,015			6,015			497			497			259		259
	Federal Home Loan Bank and Federal Reserve Bank stock, at cost	80,951			80,951			79,261			79,261			76,755		76,755
	Brokerage customer receivables	26,624			26,624			30,953			30,953			29,253		29,253
	Mortgage loans held-for-sale, at fair value	363,303			363,303			332,485			332,485			329,186		329,186
	Mortgage loans held-for-sale, at lower of cost or market	—			—			1,842			1,857			5,159		5,218
	Total loans	14,306,664			15,001,394			13,243,033			13,867,255			12,997,027		13,576,959
	Mortgage servicing rights	8,137			8,137			8,946			8,946			8,608		8,608
	Nonqualified deferred compensation assets	7,927			7,927			7,222			7,222			6,801		6,801
	Derivative assets	43,343			43,343			48,221			48,221			57,573		57,573
	FDIC indemnification asset	27,359			27,359			85,672			85,672			100,313		100,313
	Accrued interest receivable and other	170,517			170,517			163,732			163,732			165,209		165,209
	Total financial assets	$	17,731,274		$	18,426,004		$	16,937,592		$	17,561,829		$	16,570,497	$	17,150,488
	Financial Liabilities
	Non-maturity deposits	$	11,761,825		$	11,761,825		$	10,442,077		$	10,442,077		$	10,386,493	$	10,386,493
	Deposits with stated maturities	4,303,421			4,303,717			4,226,712			4,242,172			4,260,953		4,272,459
	Federal Home Loan Bank advances	347,500			352,516			417,762			422,750			387,852		393,602
	Other borrowings	51,483			51,483			255,104			255,104			248,416		248,416
	Subordinated notes	140,000			142,720			—			—			10,000		10,000
	Junior subordinated debentures	249,493			250,452			249,493			250,672			249,493		250,751
	Derivative liabilities	35,505			35,505			37,264			37,264			49,300		49,300
	Accrued interest payable	8,995			8,995			8,556			8,556			7,758		7,758
	Total financial liabilities	$	16,898,222		$	16,907,213		$	15,636,968		$	15,658,595		$	15,600,265	$	15,618,779

StockBased_Compensation_Plans_

Stock-Based Compensation Plans (Tables)	9 Months Ended
	Sep. 30, 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 nine month periods ending September 30, 2014 and 2013.
		Nine Months Ended		Nine Months Ended
		September 30,		September 30,
		2014		2013
	Expected dividend yield	0.4	%	0.5	%
	Expected volatility	30.8	%	59.1	%
	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 nine months ended September 30, 2014 and September 30, 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	366,478			46.85
	Exercised	(139,928	)		33.9
	Forfeited or canceled	(99,147	)		50.61
	Outstanding at September 30, 2014	1,652,075			$	43.24	3.4		$	8,133
	Exercisable at September 30, 2014	1,050,665			$	43.86	2.1		$	5,851
	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	235,002			37.97
	Exercised	(78,184	)		28.5
	Forfeited or canceled	(45,818	)		45.18
	Outstanding at September 30, 2013	1,856,427			$	42.27	2.4		$	6,786
	Exercisable at September 30, 2013	1,845,560			$	42.32	2.4		$	6,710
	-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.
Summary Of Plans' Restricted Share And Performance-Vested Stock Award Activity	'
	A summary of the Plans' restricted share activity for the nine months ended September 30, 2014 and September 30, 2013 is presented below:
		Nine months ended September 30, 2014					Nine months ended September 30, 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	12,313			46.04		10,617			40.86
	Vested and issued	(51,978	)		35.12		(135,767	)		31.97
	Forfeited	(6,752	)		37.95		(1,236	)		35.02
	Outstanding at September 30	135,105			$	47.09	187,840			$	42.51
	Vested, but not issuable at September 30	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 nine months ended September 30, 2014 and September 30, 2013 is presented below:
		Nine months ended September 30, 2014					Nine months ended September 30, 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	93,535			46.85		105,825			37.87
	Vested and issued	(15,944	)		33.25		—			—
	Forfeited	(89,424	)		33.78		(7,641	)		34.05
	Outstanding at September 30	295,679			$	38.18	312,749			$	33.99

Shareholders_Equity_and_Earnin1

Shareholders' Equity and Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2014
Earnings Per Share, Basic and Diluted, Other Disclosures [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 (Losses) Gains on Securities				Unrealized				Foreign				Accumulated
						Losses on				Currency				Other
						Derivative				Translation				Comprehensive
						Instruments				Adjustments				(Loss) Income
	Balance at July 1, 2014	$	(24,003	)		$	(2,898	)		$	(7,602	)		$	(34,503	)
	Other comprehensive income (loss) during the period, net of tax, before reclassifications	812				252				(9,685		)		(8,621		)
	Amount reclassified from accumulated other comprehensive income, net of tax	91				333				—				424
	Net other comprehensive income (loss) during the period, net of tax	$	903			$	585			$	(9,685	)		$	(8,197	)
	Balance at September 30, 2014	$	(23,100	)		$	(2,313	)		$	(17,287	)		$	(42,700	)
	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	30,251				(795		)		(10,378		)		19,078
	Amount reclassified from accumulated other comprehensive income, net of tax	314				944				—				1,258
	Net other comprehensive income (loss)during the period, net of tax	$	30,565			$	149			$	(10,378	)		$	20,336
	Balance at September 30, 2014	$	(23,100	)		$	(2,313	)		$	(17,287	)		$	(42,700	)
	Balance at July 1, 2013	$	(41,213	)		$	(3,100	)		$	(4,891	)		$	(49,204	)
	Other comprehensive (loss) income during the period, net of tax, before reclassifications	(1,460		)		(518		)		3,905				1,927
	Amount reclassified from accumulated other comprehensive income, net of tax	(45		)		908				—				863
	Net other comprehensive (loss) income during the period, net of tax	$	(1,505	)		$	390			$	3,905			$	2,790
	Balance at September 30, 2013	$	(42,718	)		$	(2,710	)		$	(986	)		$	(46,414	)
	Balance at January 1, 2013	$	6,710			$	(5,292	)		$	6,293			$	7,711
	Other comprehensive (loss) income during the period, net of tax, before reclassifications	(49,231		)		(206		)		(7,279		)		(56,716		)
	Amount reclassified from accumulated other comprehensive income, net of tax	(197		)		2,788				—				2,591
	Net other comprehensive (loss) income during the period, net of tax	$	(49,428	)		$	2,582			$	(7,279	)		$	(54,125	)
	Balance at September 30, 2013	$	(42,718	)		$	(2,710	)		$	(986	)		$	(46,414	)
Other Comprehensive Income Reclassified from AOCI	'
		Amount Reclassified from Accumulated Other Comprehensive Income for the
	Details Regarding the Component of Accumulated Other Comprehensive Income	Three months ended								Nine months ended							Impacted Line on the Consolidated Statements of Income
		September 30,								September 30,
		2014				2013				2014				2013
	Accumulated unrealized losses on securities
	Gains included in net income	$	(153	)		$	75			$	(522	)		$	328		(Losses) gains on available-for-sale securities, net
		(153		)		75				(522		)		328			Income before taxes
	Tax effect	$	62			$	(30	)		$	208			$	(131	)	Income tax expense
	Net of tax	$	(91	)		$	45			$	(314	)		$	197		Net income
	Accumulated unrealized losses on derivative instruments
	Amount reclassified to interest expense on junior subordinated debentures	$	553			$	1,507			$	1,567			$	4,629		Interest on junior subordinated debentures
		(553		)		(1,507		)		(1,567		)		(4,629		)	Income before taxes
	Tax effect	$	220			$	599			$	623			$	1,841		Income tax expense
	Net of tax	$	(333	)		$	(908	)		$	(944	)		$	(2,788	)	Net income
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								Nine months ended
	(In thousands, except per share data)			30-Sep-14				30-Sep-13				30-Sep-14				September 30,
																2013
	Net income			$	40,224			$	35,563			$	113,265			$	101,922
	Less: Preferred stock dividends and discount accretion			1,581				1,581				4,743				6,814
	Net income applicable to common shares—Basic	(A)		38,643				33,982				108,522				95,108
	Add: Dividends on convertible preferred stock, if dilutive			1,581				1,581				4,743				6,744
	Net income applicable to common shares—Diluted	(B)		40,224				35,563				113,265				101,852
	Weighted average common shares outstanding	(C)		46,639				39,331				46,453				37,939
	Effect of dilutive potential common shares
	Common stock equivalents			1,166				7,346				1,274				7,263
	Convertible preferred stock, if dilutive			3,075				3,477				3,075				4,500
	Total dilutive potential common shares			4,241				10,823				4,349				11,763
	Weighted average common shares and effect of dilutive potential common shares	(D)		50,880				50,154				50,802				49,702
	Net income per common share:
	Basic	(A/C)		$	0.83			$	0.86			$	2.34			$	2.51
	Diluted	(B/D)		$	0.79			$	0.71			$	2.23			$	2.05

Business_Combinations_Summary_

Business Combinations (Summary Of FDIC Indemnification Asset) (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
FDIC Indemnification Asset [Roll Forward]	'	'	'	'
Balance at beginning of period	$46,115	$137,681	$85,672	$208,160
Additions from acquisitions	0	0	0	0
Additions from reimbursable expenses	1,584	3,062	4,933	10,922
Amortization	-1,382	-1,763	-4,441	-5,884
Changes in expected reimbursements from the FDIC for changes in expected credit losses	-12,124	-12,742	-41,153	-65,477
Payments received from the FDIC	-6,834	-25,925	-17,652	-47,408
Balance at end of period	$27,359	$100,313	$27,359	$100,313

Business_Combinations_Narrativ

Business Combinations (Narrative) (Detail) (USD $)

9 Months Ended

0 Months Ended

0 Months Ended

57 Months Ended

0 Months Ended

12 Months Ended

0 Months Ended

Sep. 30, 2014

Aug. 08, 2014

Aug. 08, 2014

Jul. 11, 2014

Jul. 11, 2014

16-May-14

Oct. 18, 2013

1-May-13

Sep. 30, 2014

Apr. 28, 2014

Oct. 02, 2013

Sep. 30, 2013

1-May-13

1-May-13

Feb. 01, 2013

Feb. 01, 2013

Talmer Bank & Trust [Member]

Talmer Bank & Trust [Member]

THE National Bank [Member]

THE National Bank [Member]

Urban Partnership Bank, Stone Park branch [Member]

Diamond Bancorp, Inc [Member]

First Lansing Bancorp, Inc. [Member]

FDIC Assisted [Member]

Policy Billing Services Inc. And Equity Premium Finance Inc. [Member]

Surety Financial Services [Member]

Surety Financial Services [Member]

South And Southwest Suburbs of Chicago, Illinois [Member]

Northwest Indiana [Member]

Second Federal [Member]

Second Federal [Member]

locations

locations

financial_institution

locations

First Lansing Bancorp, Inc. [Member]

First Lansing Bancorp, Inc. [Member]

locations

locations

Business Acquisition [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Effective date of acquisition

'

'

8-Aug-14

11-Jul-14

'

16-May-14

18-Oct-13

1-May-13

'

28-Apr-14

1-Oct-13

'

'

'

'

'

Number of locations

'

'

11

'

'

'

4

'

'

'

'

5

7

1

'

'

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

'

'

$361,300,000

'

$94,100,000

'

$172,500,000

$373,400,000

'

'

'

'

'

'

'

'

Business acquisition, loans acquired

'

'

41,500,000

'

75,000,000

'

91,700,000

123,000,000

'

7,400,000

'

'

'

'

'

'

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

'

'

361,300,000

'

'

5,500,000

169,100,000

334,700,000

'

'

'

'

'

'

'

'

Assumed deposits

'

'

354,900,000

'

36,200,000

5,400,000

140,200,000

331,400,000

'

'

'

'

'

'

'

'

Additional goodwill recorded on acquisition

33,234,000

9,700,000

'

16,300,000

'

678,000

8,400,000

14,000,000

'

6,500,000

9,500,000

'

'

'

'

'

Number of FDIC assisted banks acquired

'

'

'

'

'

'

'

'

9

'

'

'

'

'

'

'

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

80.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Disposal Date

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1-Feb-13

'

Divestiture of businesses, deposits disposed

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

149,000,000

Number of Affiliated Companies Acquired

'

'

'

'

'

'

'

'

'

2

'

'

'

'

'

'

Mortgage Loan Originations

'

'

'

'

'

'

'

'

'

'

'

$1,000,000,000

'

'

'

'

AvailableForSale_Securities_Sc

Available-For-Sale Securities (Schedule Of Available-For-Sale Securities Reconciliation) (Detail) (USD $)	Sep. 30, 2014		Dec. 31, 2013		Sep. 30, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'		'		'
Available-for-sale securities, amortized cost	$1,821,033		$2,265,118		$1,852,585
Gross unrealized gains	21,156		11,758		12,436
Gross unrealized losses	-59,541		-100,586		-83,138
Available-for-sale securities, at fair value	1,782,648		2,176,290		1,781,883
US Treasury [Member]	'		'		'
Schedule of Available-for-sale Securities [Line Items]	'		'		'
Available-for-sale securities, amortized cost	388,873		354,262		225,190
Gross unrealized gains	372		141		150
Gross unrealized losses	-10,984		-18,308		-14,438
Available-for-sale securities, at fair value	378,261		336,095		210,902
U.S. Government Agencies [Member]	'		'		'
Schedule of Available-for-sale Securities [Line Items]	'		'		'
Available-for-sale securities, amortized cost	771,255		950,086		954,050
Gross unrealized gains	3,866		1,680		2,213
Gross unrealized losses	-35,369		-56,078		-43,574
Available-for-sale securities, at fair value	739,752		895,688		912,689
Municipal [Member]	'		'		'
Schedule of Available-for-sale Securities [Line Items]	'		'		'
Available-for-sale securities, amortized cost	184,015		154,463		152,010
Gross unrealized gains	4,969		2,551		1,983
Gross unrealized losses	-1,881		-4,298		-3,346
Available-for-sale securities, at fair value	187,103		152,716		150,647
Corporate Notes, Financial Issuers [Member]	'		'		'
Schedule of Available-for-sale Securities [Line Items]	'		'		'
Available-for-sale securities, amortized cost	129,259		129,362		132,320
Gross unrealized gains	2,252		1,993		2,252
Gross unrealized losses	-1,208		-2,411		-2,513
Available-for-sale securities, at fair value	130,303		128,944		132,059
Corporate Notes, Other [Member]	'		'		'
Schedule of Available-for-sale Securities [Line Items]	'		'		'
Available-for-sale securities, amortized cost	3,773		5,994		7,011
Gross unrealized gains	79		105		126
Gross unrealized losses	0		-5		-15
Available-for-sale securities, at fair value	3,852		6,094		7,122
Mortgage-Backed Securities [Member]	'		'		'
Schedule of Available-for-sale Securities [Line Items]	'		'		'
Available-for-sale securities, amortized cost	246,354	[1]	562,708	[1]	268,166	[1]
Gross unrealized gains	4,303	[1]	3,537	[1]	4,157	[1]
Gross unrealized losses	-8,938	[1]	-18,047	[1]	-12,861	[1]
Available-for-sale securities, at fair value	241,719	[1]	548,198	[1]	259,462	[1]
Mortgage-Backed, Collateralized Mortgage Obligations [Member]	'		'		'
Schedule of Available-for-sale Securities [Line Items]	'		'		'
Available-for-sale securities, amortized cost	49,909	[1]	57,711	[1]	60,001	[1]
Gross unrealized gains	357	[1]	258	[1]	458	[1]
Gross unrealized losses	-763	[1]	-942	[1]	-728	[1]
Available-for-sale securities, at fair value	49,503	[1]	57,027	[1]	59,731	[1]
Equity Securities [Member]	'		'		'
Schedule of Available-for-sale Securities [Line Items]	'		'		'
Available-for-sale securities, amortized cost	47,595		50,532		53,837
Gross unrealized gains	4,958		1,493		1,097
Gross unrealized losses	-398		-497		-5,663
Available-for-sale securities, at fair value	$52,155		$51,528		$49,271
[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 $)	Sep. 30, 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	$65,004
Continuous unrealized losses existing for less than 12 months, Unrealized losses	-350
Continuous unrealized losses existing for greater than 12 months, Fair value	907,945
Continuous unrealized losses existing for greater than 12 months, Unrealized losses	-59,191
Total, Fair value	972,949
Total, Unrealized losses	-59,541
US Treasury [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Continuous unrealized losses existing for less than 12 months, Fair value	10,006
Continuous unrealized losses existing for less than 12 months, Unrealized losses	-3
Continuous unrealized losses existing for greater than 12 months, Fair value	189,172
Continuous unrealized losses existing for greater than 12 months, Unrealized losses	-10,981
Total, Fair value	199,178
Total, Unrealized losses	-10,984
U.S. Government Agencies [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Continuous unrealized losses existing for less than 12 months, Fair value	13,557
Continuous unrealized losses existing for less than 12 months, Unrealized losses	-78
Continuous unrealized losses existing for greater than 12 months, Fair value	447,369
Continuous unrealized losses existing for greater than 12 months, Unrealized losses	-35,291
Total, Fair value	460,926
Total, Unrealized losses	-35,369
Municipal [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Continuous unrealized losses existing for less than 12 months, Fair value	9,029
Continuous unrealized losses existing for less than 12 months, Unrealized losses	-113
Continuous unrealized losses existing for greater than 12 months, Fair value	47,937
Continuous unrealized losses existing for greater than 12 months, Unrealized losses	-1,768
Total, Fair value	56,966
Total, Unrealized losses	-1,881
Corporate Notes, Financial Issuers [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Continuous unrealized losses existing for less than 12 months, Fair value	1,318
Continuous unrealized losses existing for less than 12 months, Unrealized losses	-3
Continuous unrealized losses existing for greater than 12 months, Fair value	57,982
Continuous unrealized losses existing for greater than 12 months, Unrealized losses	-1,205
Total, Fair value	59,300
Total, Unrealized losses	-1,208
Corporate Notes, Other [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	0
Continuous unrealized losses existing for greater than 12 months, Unrealized losses	0
Total, Fair value	0
Total, Unrealized losses	0
Mortgage-Backed Securities [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Continuous unrealized losses existing for less than 12 months, Fair value	14,619
Continuous unrealized losses existing for less than 12 months, Unrealized losses	-3
Continuous unrealized losses existing for greater than 12 months, Fair value	141,358
Continuous unrealized losses existing for greater than 12 months, Unrealized losses	-8,935
Total, Fair value	155,977
Total, Unrealized losses	-8,938
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	16,475
Continuous unrealized losses existing for less than 12 months, Unrealized losses	-150
Continuous unrealized losses existing for greater than 12 months, Fair value	13,728
Continuous unrealized losses existing for greater than 12 months, Unrealized losses	-613
Total, Fair value	30,203
Total, Unrealized losses	-763
Equity Securities [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	10,399
Continuous unrealized losses existing for greater than 12 months, Unrealized losses	-398
Total, Fair value	10,399
Total, Unrealized losses	($398)

AvailableForSale_Securities_Sc1

Available-For-Sale Securities (Schedule Of Realized Gain (Loss)) (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Available-for-sale Securities [Abstract]	'	'	'	'
Realized gains	$179	$118	$333	$434
Realized losses	-332	-43	-855	-106
Net realized (losses) gains	-153	75	-522	328
Other than temporary impairment charges	0	0	0	0
(Losses) gains on available-for-sale securities, net	-153	75	-522	328
Proceeds from sales of available-for-sale securities	$382,552	$45,078	$578,594	$129,537

AvailableForSale_Securities_In

Available-For-Sale Securities (Investments Classified by Contractual Maturity Date) (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'	'
Due in one year or less, Amortized Cost	$216,244	$268,847	$285,746
Due in one to five years, Amortized Cost	309,914	358,108	316,076
Due in five to ten years, Amortized Cost	327,505	350,372	344,742
Due after ten years, Amortized Cost	623,512	616,840	524,017
Available-for-sale securities, amortized cost	1,821,033	2,265,118	1,852,585
Due in one year or less, Fair Value	216,582	269,168	286,066
Due in one to five years, Fair Value	310,917	358,357	316,474
Due in five to ten years, Fair Value	317,654	330,020	328,895
Due after ten years, Fair Value	594,118	561,992	481,984
Available-for-sale securities, at fair value	1,782,648	2,176,290	1,781,883
Asset-backed Securities [Member]	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'
Available-for-sale securities, amortized cost	296,263	620,419	328,167
Available-for-sale securities, at fair value	291,222	605,225	319,193
Equity Securities [Member]	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'
Available-for-sale securities, amortized cost	47,595	50,532	53,837
Available-for-sale securities, at fair value	$52,155	$51,528	$49,271

AvailableForSale_Securities_Na

Available-For-Sale Securities (Narrative) (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
In Billions, unless otherwise specified	securities
Available-for-sale Securities [Abstract]	'	'	'
Pledged Securities, carrying value	$1.10	$1.20	$1.20
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 $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
In Thousands, unless otherwise specified
Loans [Line Items]	'	'	'
Loans, net of unearned income, excluding covered loans	$14,052,059	$12,896,602	$12,581,039
Covered loans	254,605	346,431	415,988
Total loans	14,306,664	13,243,033	12,997,027
Total loans, net of unearned income, excluding covered loans, percentage	98.00%	97.00%	97.00%
Covered loans, percentage	2.00%	3.00%	3.00%
Total loans, percentage	100.00%	100.00%	100.00%
Commercial	'	'	'
Loans [Line Items]	'	'	'
Loans, net of unearned income, excluding covered loans	3,689,671	3,253,687	3,109,121
Total loans, net of unearned income, excluding covered loans, percentage	26.00%	25.00%	24.00%
Commercial real-estate	'	'	'
Loans [Line Items]	'	'	'
Loans, net of unearned income, excluding covered loans	4,510,375	4,230,035	4,146,110
Total loans, net of unearned income, excluding covered loans, percentage	31.00%	32.00%	32.00%
Home equity	'	'	'
Loans [Line Items]	'	'	'
Loans, net of unearned income, excluding covered loans	720,058	719,137	736,620
Total loans, net of unearned income, excluding covered loans, percentage	5.00%	5.00%	6.00%
Residential real-estate	'	'	'
Loans [Line Items]	'	'	'
Loans, net of unearned income, excluding covered loans	470,319	434,992	397,707
Total loans, net of unearned income, excluding covered loans, percentage	3.00%	3.00%	3.00%
Premium finance receivables | Premium finance receivables - commercial	'	'	'
Loans [Line Items]	'	'	'
Loans, net of unearned income, excluding covered loans	2,377,892	2,167,565	2,150,481
Total loans, net of unearned income, excluding covered loans, percentage	17.00%	16.00%	16.00%
Premium finance receivables | Premium finance receivables - life insurance	'	'	'
Loans [Line Items]	'	'	'
Loans, net of unearned income, excluding covered loans	2,134,405	1,923,698	1,869,739
Total loans, net of unearned income, excluding covered loans, percentage	15.00%	15.00%	14.00%
Consumer and other	'	'	'
Loans [Line Items]	'	'	'
Loans, net of unearned income, excluding covered loans	$149,339	$167,488	$171,261
Total loans, net of unearned income, excluding covered loans, percentage	1.00%	1.00%	2.00%

Loans_Unpaid_Principal_Balance

Loans (Unpaid Principal Balance And Carrying Value Of Acquired Loans) (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Bank acquisitions	'	'
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]	'	'
Unpaid Principal Balance	$316,682	$453,944
Carrying Value	247,678	338,517
Life insurance premium finance loans acquisition	'	'
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]	'	'
Unpaid Principal Balance	415,458	437,155
Carrying Value	$407,602	$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				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Bank Acquisitions [Member]	'		'		'		'
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]	'		'		'		'
Accretable yield, beginning balance	$92,102,000		$130,856,000		$107,655,000		$143,224,000
Acquisitions	0		0		0		1,977,000
Accretable yield amortized to interest income	-6,722,000		-9,056,000		-24,109,000		-27,980,000
Accretable yield amortized to indemnification asset	-8,784,000	[1]	-8,279,000	[1]	-25,593,000	[1]	-28,891,000	[1]
Reclassification from non-accretable difference	2,584,000	[2]	8,703,000	[2]	29,092,000	[2]	44,907,000	[2]
(Decreases) increases in interest cash flows due to payments and changes in interest rates	4,564,000		-5,194,000		-3,301,000		-16,207,000
Accretable yield, ending balance	83,744,000	[3]	117,030,000	[3]	83,744,000	[3]	117,030,000	[3]
Certain Loans Acquired In Transfer Not Accounted fo as Debt Securities, Accretable Yield, To Be Amortized To Indem Asset	21,000,000		'		21,000,000		'
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	5,179,000		10,287,000		8,254,000		13,055,000
Acquisitions	0		0		0		0
Accretable yield amortized to interest income	-1,125,000		-1,943,000		-4,329,000		-6,216,000
Accretable yield amortized to indemnification asset	0	[1]	0	[1]	0	[1]	0	[1]
Reclassification from non-accretable difference	0	[2]	234,000	[2]	0	[2]	1,241,000	[2]
(Decreases) increases in interest cash flows due to payments and changes in interest rates	111,000		235,000		240,000		733,000
Accretable yield, ending balance	$4,165,000	[3]	$8,813,000	[3]	$4,165,000	[3]	$8,813,000	[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 September 30, 2014, the Company estimates that the remaining accretable yield balance to be amortized to the indemnification asset for the bank acquisitions is $21.0 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 $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
				Bank Acquisitions [Member]	Bank Acquisitions [Member]	Bank Acquisitions [Member]	Bank Acquisitions [Member]	Premium finance receivables	Premium finance receivables	Premium finance receivables
Schedule Of Accretable Yield Activity Related to Loans Acquired With Evidence Of Credit Quality Deterioration Since Origination Table [Line Items]	'	'	'	'	'	'	'	'	'	'
Loans and Leases Receivable, Deferred Income	'	'	'	'	'	'	'	$44,800,000	$41,900,000	$40,600,000
Deferred Discounts, Finance Charges and Interest Included in Receivables	6,300,000	-9,200,000	1,500,000	'	'	'	'	'	'	'
Certain Loans Acquired In Transfer Not Accounted fo as Debt Securities, Accretable Yield, To Be Amortized To Indem Asset	'	'	'	21,000,000	'	21,000,000	'	'	'	'
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion	'	'	'	$6,722,000	$9,056,000	$24,109,000	$27,980,000	'	'	'

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 $)	Sep. 30, 2014		Dec. 31, 2013		Sep. 30, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	$79,822		$103,582		$115,841
90+ days and still accruing	49,547		86,484		107,799
60-89 days past due	35,958		39,698		42,801
30-59 days past due	72,056		84,566		91,992
Current	14,069,281		12,928,703		12,638,594
Loans, net of unearned income, excluding covered loans	14,052,059		12,896,602		12,581,039
Nonaccrual	73,780		94,157		107,239
90+ days and still accruing	23,377		30,202		26,369
60-89 days past due	31,669		33,821		32,988
30-59 days past due	66,401		76,629		82,776
Current	13,856,832		12,661,793		12,331,667
Covered loans, Nonaccrual	6,042		9,425		8,602
Covered loans, 90 plus days and still accruing	26,170		56,282		81,430
Covered loans, 60-89 days past due	4,289		5,877		9,813
Covered loans, 30-59 days past due	5,655		7,937		9,216
Covered loans, Current	212,449		266,910		306,927
Covered loans	254,605		346,431		415,988
Total loans	14,306,664		13,243,033		12,997,027
Commercial	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	10,455		10,780		17,647
90+ days and still accruing	863		274		455
60-89 days past due	10,356		5,882		4,391
30-59 days past due	11,137		11,755		20,829
Current	3,656,860		3,224,996		3,065,799
Loans, net of unearned income, excluding covered loans	3,689,671		3,253,687		3,109,121
Commercial real-estate	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	27,363		46,658		52,723
90+ days and still accruing	14,294		18,812		12,996
60-89 days past due	5,497		15,394		11,972
30-59 days past due	27,739		29,870		37,859
Current	4,435,482		4,119,301		4,030,560
Loans, net of unearned income, excluding covered loans	4,510,375		4,230,035		4,146,110
Home equity	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	5,696		10,071		10,926
90+ days and still accruing	0		0		0
60-89 days past due	1,181		1,344		2,436
30-59 days past due	2,597		3,060		5,887
Current	710,584		704,662		717,371
Loans, net of unearned income, excluding covered loans	720,058		719,137		736,620
Residential real-estate	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	470,319		434,992		397,707
Consumer and other	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	426		1,137		1,671
90+ days and still accruing	175		286		128
60-89 days past due	123		76		416
30-59 days past due	1,133		1,010		695
Current	147,482		164,979		168,351
Loans, net of unearned income, excluding covered loans	149,339		167,488		171,261
Commercial and industrial | Commercial	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	10,430		10,143		15,283
90+ days and still accruing	0		0		190
60-89 days past due	7,333		4,938		3,585
30-59 days past due	8,559		7,404		15,261
Current	2,044,505		1,813,721		1,688,232
Loans, net of unearned income, excluding covered loans	2,070,827		1,836,206		1,722,551
Franchise | Commercial	'		'		'
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		400		113
30-59 days past due	1,221		0		0
Current	237,079		219,983		213,215
Loans, net of unearned income, excluding covered loans	238,300		220,383		213,328
Mortgage warehouse line of credit | Commercial	'		'		'
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	121,585		67,470		71,383
Loans, net of unearned income, excluding covered loans	121,585		67,470		71,383
Community Advanatage - homeowners association | Commercial	'		'		'
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	99,595		90,894		90,504
Loans, net of unearned income, excluding covered loans	99,595		90,894		90,504
Aircraft | Commercial	'		'		'
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	6,146		10,241		12,601
Loans, net of unearned income, excluding covered loans	6,146		10,241		12,601
Asset-based lending | Commercial	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	25		637		2,364
90+ days and still accruing	0		0		0
60-89 days past due	2,959		388		693
30-59 days past due	1,220		1,878		3,926
Current	777,723		732,190		732,585
Loans, net of unearned income, excluding covered loans	781,927		735,093		739,568
Tax exempt | Commercial	'		'		'
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	205,150		161,239		148,103
Loans, net of unearned income, excluding covered loans	205,150		161,239		148,103
Leases | Commercial	'		'		'
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		0
Current	145,439		109,043		101,654
Loans, net of unearned income, excluding covered loans	145,439		109,831		101,654
Other | Commercial	'		'		'
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	11,403		11,147		90
Loans, net of unearned income, excluding covered loans	11,403		11,147		90
PCI - commercial | Commercial	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	0	[1]	0	[1]	0	[1]
90+ days and still accruing	863	[1]	274	[1]	265	[1]
60-89 days past due	64	[1]	156	[1]	0	[1]
30-59 days past due	137	[1]	1,685	[1]	1,642	[1]
Current	8,235	[1]	9,068	[1]	7,432	[1]
Loans, net of unearned income, excluding covered loans	9,299	[1],[2]	11,183	[1],[2]	9,339	[1],[2]
Residential construction | Commercial real-estate	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	0		149		2,049
90+ days and still accruing	0		0		3,120
60-89 days past due	0		0		1,595
30-59 days past due	0		0		261
Current	30,237		38,351		33,305
Loans, net of unearned income, excluding covered loans	30,237		38,500		40,330
Commercial construction | Commercial real-estate	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	425		6,969		7,854
90+ days and still accruing	0		0		0
60-89 days past due	0		0		0
30-59 days past due	0		505		0
Current	159,383		129,232		138,234
Loans, net of unearned income, excluding covered loans	159,808		136,706		146,088
Land | Commercial real-estate	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	2,556		2,814		4,216
90+ days and still accruing	0		0		0
60-89 days past due	1,316		4,224		0
30-59 days past due	2,918		619		4,082
Current	94,449		99,128		100,953
Loans, net of unearned income, excluding covered loans	101,239		106,785		109,251
Office | Commercial real-estate	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	7,366		10,087		4,318
90+ days and still accruing	0		0		0
60-89 days past due	1,696		2,265		3,965
30-59 days past due	1,888		3,862		1,270
Current	688,390		626,027		624,967
Loans, net of unearned income, excluding covered loans	699,340		642,241		634,520
Industrial | Commercial real-estate	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	2,626		5,654		8,184
90+ days and still accruing	0		0		0
60-89 days past due	224		585		0
30-59 days past due	367		914		2,419
Current	624,669		626,785		614,409
Loans, net of unearned income, excluding covered loans	627,886		633,938		625,012
Retail | Commercial real-estate	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	6,205		10,862		11,259
90+ days and still accruing	0		0		0
60-89 days past due	0		837		271
30-59 days past due	4,117		2,435		7,422
Current	715,568		642,125		593,263
Loans, net of unearned income, excluding covered loans	725,890		656,259		612,215
Multi-family | Commercial real-estate	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	249		2,035		2,603
90+ days and still accruing	0		0		0
60-89 days past due	793		0		0
30-59 days past due	2,319		348		4,332
Current	674,610		564,154		543,690
Loans, net of unearned income, excluding covered loans	677,971		566,537		550,625
Mixed use and other | Commercial real-estate	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	7,936		8,088		12,240
90+ days and still accruing	0		230		269
60-89 days past due	1,468		3,943		2,761
30-59 days past due	10,323		15,949		15,371
Current	1,407,659		1,344,244		1,339,029
Loans, net of unearned income, excluding covered loans	1,427,386		1,372,454		1,369,670
PCI - Commercial real-estate | Commercial real-estate	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	0	[1]	0	[1]	0	[1]
90+ days and still accruing	14,294	[1]	18,582	[1]	9,607	[1]
60-89 days past due	0	[1]	3,540	[1]	3,380	[1]
30-59 days past due	5,807	[1]	5,238	[1]	2,702	[1]
Current	40,517	[1]	49,255	[1]	42,710	[1]
Loans, net of unearned income, excluding covered loans	60,618	[1],[2]	76,615	[1],[2]	58,399	[1],[2]
Residential real-estate | Residential real-estate	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	15,730		14,974		14,126
90+ days and still accruing	0		0		0
60-89 days past due	670		1,689		1,749
30-59 days past due	2,696		5,032		2,844
Current	448,528		410,430		377,489
Loans, net of unearned income, excluding covered loans	467,624		432,125		396,208
PCI - Residential real-estate | Residential real-estate	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	0	[1]	0	[1]	0	[1]
90+ days and still accruing	930	[1]	1,988	[1]	447	[1]
60-89 days past due	30	[1]	0	[1]	289	[1]
30-59 days past due	0	[1]	0	[1]	34	[1]
Current	1,735	[1]	879	[1]	729	[1]
Loans, net of unearned income, excluding covered loans	2,695	[1],[2]	2,867	[1],[2]	1,499	[1],[2]
Commercial insurance loans | Premium finance receivables	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	14,110		10,537		10,132
90+ days and still accruing	7,115		8,842		11,751
60-89 days past due	6,279		6,912		5,307
30-59 days past due	14,157		24,094		14,628
Current	2,336,231		2,117,180		2,108,663
Loans, net of unearned income, excluding covered loans	2,377,892		2,167,565		2,150,481
Life insurance loans | Premium finance receivables	'		'		'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'		'		'
Nonaccrual	0		0		14
90+ days and still accruing	0		0		592
60-89 days past due	7,533		2,524		6,428
30-59 days past due	6,942		1,808		0
Current	1,712,328		1,495,460		1,402,822
Loans, net of unearned income, excluding covered loans	1,726,803		1,499,792		1,409,856
PCI - life insurance loans | Premium finance receivables	'		'		'
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	407,602	[1]	423,906	[1]	459,883	[1]
Loans, net of unearned income, excluding covered loans	$407,602	[1],[2]	$423,906	[1],[2]	$459,883	[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 $)	Sep. 30, 2014		Dec. 31, 2013		Sep. 30, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	$14,052,059		$12,896,602		$12,581,039
Performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	13,970,989		12,793,268		12,457,778
Non-performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	81,070		103,334		123,261
Commercial	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	3,689,671		3,253,687		3,109,121
Commercial | Performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	3,679,216		3,242,907		3,091,284
Commercial | Non-performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	10,455		10,780		17,837
Commercial real-estate	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	4,510,375		4,230,035		4,146,110
Commercial real-estate | Performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	4,483,012		4,183,147		4,089,998
Commercial real-estate | Non-performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	27,363		46,888		56,112
Home equity	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	720,058		719,137		736,620
Home equity | Performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	714,362		709,066		725,694
Home equity | Non-performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	5,696		10,071		10,926
Residential real-estate	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	470,319		434,992		397,707
Consumer and other	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	149,339		167,488		171,261
Consumer and other | Performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	148,738		166,246		169,490
Consumer and other | Non-performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	601		1,242		1,771
Commercial and industrial | Commercial	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	2,070,827		1,836,206		1,722,551
Commercial and industrial | Commercial | Performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	2,060,397		1,826,063		1,707,078
Commercial and industrial | Commercial | Non-performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	10,430		10,143		15,473
Franchise | Commercial	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	238,300		220,383		213,328
Franchise | Commercial | Performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	238,300		220,383		213,328
Franchise | Commercial | Non-performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	0		0		0
Mortgage warehouse line of credit | Commercial	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	121,585		67,470		71,383
Mortgage warehouse line of credit | Commercial | Performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	121,585		67,470		71,383
Mortgage warehouse line of credit | Commercial | Non-performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	0		0		0
Community Advanatage - homeowners association | Commercial	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	99,595		90,894		90,504
Community Advanatage - homeowners association | Commercial | Performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	99,595		90,894		90,504
Community Advanatage - homeowners association | Commercial | Non-performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	0		0		0
Aircraft | Commercial	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	6,146		10,241		12,601
Aircraft | Commercial | Performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	6,146		10,241		12,601
Aircraft | Commercial | Non-performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	0		0		0
Asset-based lending | Commercial	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	781,927		735,093		739,568
Asset-based lending | Commercial | Performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	781,902		734,456		737,204
Asset-based lending | Commercial | Non-performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	25		637		2,364
Tax exempt | Commercial	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	205,150		161,239		148,103
Tax exempt | Commercial | Performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	205,150		161,239		148,103
Tax exempt | Commercial | Non-performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	0		0		0
Leases | Commercial	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	145,439		109,831		101,654
Leases | Commercial | Performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	145,439		109,831		101,654
Leases | Commercial | Non-performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	0		0		0
Other | Commercial	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	11,403		11,147		90
Other | Commercial | Performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	11,403		11,147		90
Other | Commercial | Non-performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	0		0		0
PCI - commercial | Commercial	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	9,299	[1],[2]	11,183	[1],[2]	9,339	[1],[2]
PCI - commercial | Commercial | Performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	9,299	[2]	11,183	[2]	9,339	[2]
PCI - commercial | Commercial | Non-performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	0	[2]	0	[2]	0	[2]
Residential construction | Commercial real-estate	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	30,237		38,500		40,330
Residential construction | Commercial real-estate | Performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	30,237		38,351		35,161
Residential construction | Commercial real-estate | Non-performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	0		149		5,169
Commercial construction | Commercial real-estate	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	159,808		136,706		146,088
Commercial construction | Commercial real-estate | Performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	159,383		129,737		138,234
Commercial construction | Commercial real-estate | Non-performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	425		6,969		7,854
Land | Commercial real-estate	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	101,239		106,785		109,251
Land | Commercial real-estate | Performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	98,683		103,971		105,035
Land | Commercial real-estate | Non-performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	2,556		2,814		4,216
Office | Commercial real-estate	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	699,340		642,241		634,520
Office | Commercial real-estate | Performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	691,974		632,154		630,202
Office | Commercial real-estate | Non-performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	7,366		10,087		4,318
Industrial | Commercial real-estate	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	627,886		633,938		625,012
Industrial | Commercial real-estate | Performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	625,260		628,284		616,828
Industrial | Commercial real-estate | Non-performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	2,626		5,654		8,184
Retail | Commercial real-estate	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	725,890		656,259		612,215
Retail | Commercial real-estate | Performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	719,685		645,397		600,956
Retail | Commercial real-estate | Non-performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	6,205		10,862		11,259
Multi-family | Commercial real-estate	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	677,971		566,537		550,625
Multi-family | Commercial real-estate | Performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	677,722		564,502		548,022
Multi-family | Commercial real-estate | Non-performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	249		2,035		2,603
Mixed use and other | Commercial real-estate	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	1,427,386		1,372,454		1,369,670
Mixed use and other | Commercial real-estate | Performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	1,419,450		1,364,136		1,357,161
Mixed use and other | Commercial real-estate | Non-performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	7,936		8,318		12,509
PCI - Commercial real-estate | Commercial real-estate	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	60,618	[1],[2]	76,615	[1],[2]	58,399	[1],[2]
PCI - Commercial real-estate | Commercial real-estate | Performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	60,618	[2]	76,615	[2]	58,399	[2]
PCI - Commercial real-estate | Commercial real-estate | Non-performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	0	[2]	0	[2]	0	[2]
Residential real-estate | Residential real-estate	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	467,624		432,125		396,208
Residential real-estate | Residential real-estate | Performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	451,894		417,151		382,082
Residential real-estate | Residential real-estate | Non-performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	15,730		14,974		14,126
PCI - Residential real-estate | Residential real-estate	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	2,695	[1],[2]	2,867	[1],[2]	1,499	[1],[2]
PCI - Residential real-estate | Residential real-estate | Performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	2,695	[2]	2,867	[2]	1,499	[2]
PCI - Residential real-estate | Residential real-estate | Non-performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	0	[2]	0	[2]	0	[2]
Commercial insurance loans | Premium finance receivables	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	2,377,892		2,167,565		2,150,481
Commercial insurance loans | Premium finance receivables | Performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	2,356,667		2,148,186		2,128,598
Commercial insurance loans | Premium finance receivables | Non-performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	21,225		19,379		21,883
Life insurance loans | Premium finance receivables	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	1,726,803		1,499,792		1,409,856
Life insurance loans | Premium finance receivables | Performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	1,726,803		1,499,792		1,409,250
Life insurance loans | Premium finance receivables | Non-performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	0		0		606
PCI - life insurance loans | Premium finance receivables	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	407,602	[1],[2]	423,906	[1],[2]	459,883	[1],[2]
PCI - life insurance loans | Premium finance receivables | Performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	407,602	[2]	423,906	[2]	459,883	[2]
PCI - life insurance loans | Premium finance receivables | Non-performing	'		'		'
Financing Receivable, Recorded Investment [Line Items]	'		'		'
Loans, net of unearned income, excluding covered loans	$0	[2]	$0	[2]	$0	[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_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		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'	'	'	'
Allowance for loan losses at beginning of period	$92,253	$106,842	$96,922	$107,351
Other adjustments	-335	-205	-588	-743
Reclassification from (to) allowance for unfunded lending-related commitments	62	284	-102	136
Charge-offs	-8,102	-12,815	-24,978	-45,752
Recoveries	1,113	1,502	3,620	4,116
Provision for credit losses	6,028	11,580	16,145	42,080
Allowance for loan losses at period end	91,019	107,188	91,019	107,188
Allowance for unfunded lending-related commitments at period end	822	1,267	822	1,267
Allowance for credit losses at period end	91,841	108,455	91,841	108,455
Allowance for credit losses at period end, Individually evaluated for impairment	6,660	14,975	6,660	14,975
Allowance for credit losses at period end, Collectively evaluated for impairment	84,962	93,259	84,962	93,259
Allowance for credit losses at period end, Loans acquired with deteriorated credit quality	219	221	219	221
Loans at period end, Individually evaluated for impairment	130,944	178,761	130,944	178,761
Loans at period end, Collectively evaluated for impairment	13,440,901	11,872,979	13,440,901	11,872,979
Loans at period end, Loans acquired with deteriorated credit quality	480,214	529,299	480,214	529,299
Commercial	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'	'	'	'
Allowance for loan losses at beginning of period	26,038	28,737	23,092	28,794
Other adjustments	-32	-15	-69	-19
Reclassification from (to) allowance for unfunded lending-related commitments	0	0	0	0
Charge-offs	-832	-3,281	-3,864	-8,914
Recoveries	296	756	883	1,319
Provision for credit losses	2,442	2,044	7,870	7,061
Allowance for loan losses at period end	27,912	28,241	27,912	28,241
Allowance for unfunded lending-related commitments at period end	0	0	0	0
Allowance for credit losses at period end	27,912	28,241	27,912	28,241
Allowance for credit losses at period end, Individually evaluated for impairment	2,296	5,498	2,296	5,498
Allowance for credit losses at period end, Collectively evaluated for impairment	25,427	22,636	25,427	22,636
Allowance for credit losses at period end, Loans acquired with deteriorated credit quality	189	107	189	107
Loans at period end, Individually evaluated for impairment	16,568	24,688	16,568	24,688
Loans at period end, Collectively evaluated for impairment	3,663,804	3,075,094	3,663,804	3,075,094
Loans at period end, Loans acquired with deteriorated credit quality	9,299	9,339	9,299	9,339
Commercial real-estate	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'	'	'	'
Allowance for loan losses at beginning of period	40,702	51,950	48,658	52,135
Other adjustments	-265	-193	-482	-621
Reclassification from (to) allowance for unfunded lending-related commitments	62	284	-102	136
Charge-offs	-4,510	-6,982	-11,354	-25,228
Recoveries	275	272	762	1,224
Provision for credit losses	2,395	5,488	1,177	23,173
Allowance for loan losses at period end	38,659	50,819	38,659	50,819
Allowance for unfunded lending-related commitments at period end	822	1,267	822	1,267
Allowance for credit losses at period end	39,481	52,086	39,481	52,086
Allowance for credit losses at period end, Individually evaluated for impairment	3,507	5,892	3,507	5,892
Allowance for credit losses at period end, Collectively evaluated for impairment	35,967	46,080	35,967	46,080
Allowance for credit losses at period end, Loans acquired with deteriorated credit quality	7	114	7	114
Loans at period end, Individually evaluated for impairment	89,201	124,401	89,201	124,401
Loans at period end, Collectively evaluated for impairment	4,360,556	3,963,310	4,360,556	3,963,310
Loans at period end, Loans acquired with deteriorated credit quality	60,618	58,399	60,618	58,399
Home equity	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'	'	'	'
Allowance for loan losses at beginning of period	13,918	14,205	12,611	12,734
Other adjustments	-1	0	-3	0
Reclassification from (to) allowance for unfunded lending-related commitments	0	0	0	0
Charge-offs	-748	-711	-3,745	-4,893
Recoveries	99	43	478	376
Provision for credit losses	-308	1,824	3,619	7,144
Allowance for loan losses at period end	12,960	15,361	12,960	15,361
Allowance for unfunded lending-related commitments at period end	0	0	0	0
Allowance for credit losses at period end	12,960	15,361	12,960	15,361
Allowance for credit losses at period end, Individually evaluated for impairment	292	2,447	292	2,447
Allowance for credit losses at period end, Collectively evaluated for impairment	12,668	12,914	12,668	12,914
Allowance for credit losses at period end, Loans acquired with deteriorated credit quality	0	0	0	0
Loans at period end, Individually evaluated for impairment	5,922	11,152	5,922	11,152
Loans at period end, Collectively evaluated for impairment	714,136	725,468	714,136	725,468
Loans at period end, Loans acquired with deteriorated credit quality	0	0	0	0
Residential real-estate	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'	'	'	'
Allowance for loan losses at beginning of period	3,733	4,825	5,108	5,560
Other adjustments	-2	-4	-6	-98
Reclassification from (to) allowance for unfunded lending-related commitments	0	0	0	0
Charge-offs	-205	-328	-1,120	-2,573
Recoveries	111	64	316	87
Provision for credit losses	405	700	-256	2,281
Allowance for loan losses at period end	4,042	5,257	4,042	5,257
Allowance for unfunded lending-related commitments at period end	0	0	0	0
Allowance for credit losses at period end	4,042	5,257	4,042	5,257
Allowance for credit losses at period end, Individually evaluated for impairment	512	886	512	886
Allowance for credit losses at period end, Collectively evaluated for impairment	3,530	4,371	3,530	4,371
Allowance for credit losses at period end, Loans acquired with deteriorated credit quality	0	0	0	0
Loans at period end, Individually evaluated for impairment	18,383	16,746	18,383	16,746
Loans at period end, Collectively evaluated for impairment	449,241	379,462	449,241	379,462
Loans at period end, Loans acquired with deteriorated credit quality	2,695	1,499	2,695	1,499
Premium finance receivables	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'	'	'	'
Allowance for loan losses at beginning of period	6,309	5,268	5,583	6,096
Other adjustments	-35	7	-28	-5
Reclassification from (to) allowance for unfunded lending-related commitments	0	0	0	0
Charge-offs	-1,557	-1,297	-4,259	-3,671
Recoveries	290	316	925	889
Provision for credit losses	1,260	1,193	4,046	2,178
Allowance for loan losses at period end	6,267	5,487	6,267	5,487
Allowance for unfunded lending-related commitments at period end	0	0	0	0
Allowance for credit losses at period end	6,267	5,487	6,267	5,487
Allowance for credit losses at period end, Individually evaluated for impairment	0	0	0	0
Allowance for credit losses at period end, Collectively evaluated for impairment	6,267	5,487	6,267	5,487
Allowance for credit losses at period end, Loans acquired with deteriorated credit quality	0	0	0	0
Loans at period end, Individually evaluated for impairment	0	0	0	0
Loans at period end, Collectively evaluated for impairment	4,104,695	3,560,337	4,104,695	3,560,337
Loans at period end, Loans acquired with deteriorated credit quality	407,602	459,883	407,602	459,883
Consumer and other	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'	'	'	'
Allowance for loan losses at beginning of period	1,553	1,857	1,870	2,032
Other adjustments	0	0	0	0
Reclassification from (to) allowance for unfunded lending-related commitments	0	0	0	0
Charge-offs	-250	-216	-636	-473
Recoveries	42	51	256	221
Provision for credit losses	-166	331	-311	243
Allowance for loan losses at period end	1,179	2,023	1,179	2,023
Allowance for unfunded lending-related commitments at period end	0	0	0	0
Allowance for credit losses at period end	1,179	2,023	1,179	2,023
Allowance for credit losses at period end, Individually evaluated for impairment	53	252	53	252
Allowance for credit losses at period end, Collectively evaluated for impairment	1,103	1,771	1,103	1,771
Allowance for credit losses at period end, Loans acquired with deteriorated credit quality	23	0	23	0
Loans at period end, Individually evaluated for impairment	870	1,774	870	1,774
Loans at period end, Collectively evaluated for impairment	148,469	169,308	148,469	169,308
Loans at period end, Loans acquired with deteriorated credit quality	$0	$179	$0	$179

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		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Allowance for Covered Loan Losses [Roll Forward]	'	'	'	'
Balance at beginning of period	$1,667	$14,429	$10,092	$13,454
Provision for covered loan losses before benefit attributable to FDIC loss share agreements	-818	-2,331	-8,703	515
Benefit attributable to FDIC loss share agreements	654	1,865	6,962	-412
Net provision for covered loan losses	-164	-466	-1,741	103
(Decrease) increase in FDIC indemnification asset	-654	-1,865	-6,962	412
Loans charged-off	-293	-3,237	-5,346	-8,294
Recoveries of loans charged-off	2,099	4,063	6,612	7,249
Net recoveries (charge-offs)	1,806	826	1,266	-1,045
Balance at end of period	$2,655	$12,924	$2,655	$12,924

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 $)	Sep. 30, 2014		Dec. 31, 2013		Sep. 30, 2013
In Thousands, unless otherwise specified
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired loans with an allowance for loan loss required	$68,471	[1]	$92,184	[1]	$99,437	[1]
Impaired loans with no allowance for loan loss required	61,066		70,045		76,861
Total impaired loans	129,537	[2]	162,229	[2]	176,298	[2]
Allowance for loan losses related to impaired loans	6,577		8,265		14,329
Financing Receivable [Member]	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Allowance for loan losses related to impaired loans	2,000		'		'
TDRs	$83,385		$107,103		$115,003
[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 $)	9 Months Ended				12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013		Dec. 31, 2013
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with Related Allowance, Recorded Investment	$68,471	[1]	$99,437	[1]	$92,184	[1]
Related Allowance	6,577		14,329		8,265
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	61,066		76,861		70,045
Recorded Investment	129,537	[2]	176,298	[2]	162,229	[2]
Unpaid Principal Balance	152,473		205,924		195,455
Average Recorded Investment	134,792		181,301		170,658
Interest Income Recognized	5,325		7,129		8,920
Home equity	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,438		5,347		3,985
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	1,533		5,559		5,238
Related Allowance	292		2,447		1,593
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	1,491		5,468		4,855
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized	42		187		236
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	4,484		5,805		6,312
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	6,490		7,215		7,790
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	4,806		5,568		6,307
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized	207		221		324
Residential real-estate	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with Related Allowance, Recorded Investment	4,889		5,999		6,876
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	4,986		6,533		7,023
Related Allowance	485		856		626
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	4,783		5,418		6,335
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized	157		170		273
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	13,234		10,482		10,761
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	14,953		12,841		13,585
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	13,291		9,805		9,443
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized	496		292		393
Consumer and other	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with Related Allowance, Recorded Investment	213		667		267
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	215		668		269
Related Allowance	53		252		109
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	215		661		273
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized	6		25		11
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	657		1,107		1,322
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	721		1,652		1,865
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	665		1,128		1,355
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized	29		79		115
Commercial and industrial | Commercial	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with Related Allowance, Recorded Investment	8,384		10,599		6,297
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	11,333		12,226		7,001
Related Allowance	2,273		3,915		1,078
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	9,367		11,155		6,611
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized	537		558		354
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	7,563		10,858		9,890
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	8,285		15,320		16,333
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	7,909		13,841		13,928
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized	306		683		1,043
Franchise | Commercial	'		'		'
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 Recognized	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 Recognized	0		0		0
Mortgage warehouse line of credit | Commercial	'		'		'
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 Recognized	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 Recognized	0		0		0
Community Advanatage - homeowners association | Commercial	'		'		'
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 Recognized	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 Recognized	0		0		0
Aircraft | Commercial	'		'		'
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 Recognized	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 Recognized	0		0		0
Asset-based lending | Commercial	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		2,287		282
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		2,296		294
Related Allowance	0		1,549		282
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		2,299		295
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized	0		86		14
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	25		76		354
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,952		1,416		2,311
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	108		87		2,162
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized	75		57		121
Tax exempt | Commercial	'		'		'
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 Recognized	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 Recognized	0		0		0
Leases | Commercial	'		'		'
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 Recognized	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 Recognized	0		0		0
Other | Commercial	'		'		'
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 Recognized	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 Recognized	0		0		0
Residential construction | Commercial real-estate	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		377		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		377		0
Related Allowance	0		49		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		379		0
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized	0		19		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		3,267		1,463
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		3,426		1,530
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		3,954		1,609
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized	0		122		64
Commercial construction | Commercial real-estate	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with Related Allowance, Recorded Investment	425		9,577		3,099
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	440		9,577		3,099
Related Allowance	195		103		18
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	432		10,051		3,098
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized	15		284		115
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	2,803		8,705		7,710
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	2,803		13,939		13,227
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	2,777		10,899		9,680
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized	98		564		722
Land | Commercial real-estate	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with Related Allowance, Recorded Investment	7,502		12,161		10,518
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	7,502		15,486		11,871
Related Allowance	40		947		259
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	7,572		12,321		10,323
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized	193		445		411
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	8,101		4,980		5,035
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	12,432		6,094		8,813
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	8,969		3,869		5,384
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized	538		181		418
Office | Commercial real-estate	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with Related Allowance, Recorded Investment	8,198		7,322		7,792
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	9,671		7,376		8,444
Related Allowance	322		111		1,253
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	8,493		7,426		8,148
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized	300		207		333
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	5,159		7,329		10,379
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	6,359		9,324		11,717
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	6,679		8,242		10,925
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized	244		358		610
Industrial | Commercial real-estate	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with Related Allowance, Recorded Investment	2,567		3,352		3,385
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	2,672		3,417		3,506
Related Allowance	151		177		193
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	2,595		3,402		3,638
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized	92		124		179
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,903		7,668		5,087
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	2,110		7,833		5,267
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,962		7,772		5,160
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized	76		357		328
Retail | Commercial real-estate	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with Related Allowance, Recorded Investment	10,861		18,583		17,511
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	11,279		18,662		17,638
Related Allowance	921		1,942		1,253
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	10,826		18,859		17,678
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized	362		564		724
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	8,095		6,230		7,047
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	10,177		6,549		8,610
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	8,647		6,270		8,462
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized	342		257		400
Multi-family | Commercial real-estate	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with Related Allowance, Recorded Investment	2,822		3,715		3,237
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	3,335		4,188		3,730
Related Allowance	107		260		235
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	2,847		3,809		2,248
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized	109		143		139
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		1,149		608
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		2,983		1,030
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		1,868		903
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized	0		115		47
Mixed use and other | Commercial real-estate	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with Related Allowance, Recorded Investment	21,172		19,451		28,935
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	21,453		19,711		29,051
Related Allowance	1,738		1,721		1,366
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	20,891		18,569		26,792
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized	656		669		1,194
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	9,042		9,205		4,077
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	11,772		11,256		6,213
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	9,467		8,181		5,046
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized	445		362		352
Commercial insurance loans | Premium finance receivables	'		'		'
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 Recognized	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 Recognized	0		0		0
Life insurance loans | Premium finance receivables	'		'		'
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 Recognized	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 Recognized	0		0		0
PCI - life insurance loans | Premium finance receivables	'		'		'
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 Recognized	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 Recognized	$0		$0		$0
[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

9 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

contracts

contracts

contracts

contracts

contracts

contracts

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

3

[1],[2]

4

[1],[2]

16

[1],[2]

30

[1],[2]

21

[1],[3]

37

[1],[3]

Restructured loans

$667

[1],[2]

$4,003

[1],[2]

$8,152

[1],[2]

$20,748

[1],[2]

$10,086

[1],[3]

$23,407

[1],[3]

Extension at Below Market Terms [Member]

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

2

[1]

4

[1]

10

[1]

25

[1]

'

'

Restructured loans

456

[1]

4,003

[1]

5,671

[1]

19,930

[1]

'

'

Reduction of Interest Rate [Member]

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

3

[1]

1

[1]

11

[1]

18

[1]

'

'

Restructured loans

667

[1]

556

[1]

5,774

[1]

7,545

[1]

'

'

Modification to Interest Only Payments [Member]

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1]

0

[1]

4

[1]

7

[1]

'

'

Restructured loans

0

[1]

0

[1]

2,659

[1]

6,539

[1]

'

'

Forgiveness of Debt [Member]

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1]

1

[1]

0

[1]

2

[1]

'

'

Restructured loans

0

[1]

1,000

[1]

0

[1]

1,073

[1]

'

'

Residential real estate and other

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

3

[1],[2]

1

[1],[2]

4

[1],[2]

8

[1],[2]

6

[1],[3]

9

[1],[3]

Restructured loans

667

[1],[2]

1,000

[1],[2]

887

[1],[2]

1,778

[1],[2]

1,406

[1],[3]

1,904

[1],[3]

Residential real estate and other | Extension at Below Market Terms [Member]

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

2

[1]

1

[1]

3

[1]

4

[1]

'

'

Restructured loans

456

[1]

1,000

[1]

676

[1]

1,095

[1]

'

'

Residential real estate and other | Reduction of Interest Rate [Member]

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

3

[1]

0

[1]

3

[1]

6

[1]

'

'

Restructured loans

667

[1]

0

[1]

667

[1]

762

[1]

'

'

Residential real estate and other | Modification to Interest Only Payments [Member]

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1]

0

[1]

1

[1]

2

[1]

'

'

Restructured loans

0

[1]

0

[1]

220

[1]

234

[1]

'

'

Residential real estate and other | Forgiveness of Debt [Member]

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1]

1

[1]

0

[1]

1

[1]

'

'

Restructured loans

0

[1]

1,000

[1]

0

[1]

1,000

[1]

'

'

Commercial and industrial | Commercial

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1],[2]

0

[1],[2]

1

[1],[2]

6

[1],[2]

1

[1],[3]

8

[1],[3]

Restructured loans

0

[1],[2]

0

[1],[2]

88

[1],[2]

708

[1],[2]

88

[1],[3]

1,694

[1],[3]

Commercial and industrial | Commercial | Extension at Below Market Terms [Member]

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1]

0

[1]

1

[1]

5

[1]

'

'

Restructured loans

0

[1]

0

[1]

88

[1]

573

[1]

'

'

Commercial and industrial | Commercial | Reduction of Interest Rate [Member]

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1]

0

[1]

0

[1]

4

[1]

'

'

Restructured loans

0

[1]

0

[1]

0

[1]

553

[1]

'

'

Commercial and industrial | Commercial | Modification to Interest Only Payments [Member]

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1]

0

[1]

1

[1]

2

[1]

'

'

Restructured loans

0

[1]

0

[1]

88

[1]

185

[1]

'

'

Commercial and industrial | Commercial | Forgiveness of Debt [Member]

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1]

0

[1]

0

[1]

0

[1]

'

'

Restructured loans

0

[1]

0

[1]

0

[1]

0

[1]

'

'

Commercial construction | Commercial real-estate

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1],[2]

0

[1],[2]

0

[1],[2]

3

[1],[2]

0

[1],[3]

3

[1],[3]

Restructured loans

0

[1],[2]

0

[1],[2]

0

[1],[2]

6,120

[1],[2]

0

[1],[3]

6,120

[1],[3]

Commercial construction | Commercial real-estate | Extension at Below Market Terms [Member]

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1]

0

[1]

0

[1]

3

[1]

'

'

Restructured loans

0

[1]

0

[1]

0

[1]

6,120

[1]

'

'

Commercial construction | Commercial real-estate | Reduction of Interest Rate [Member]

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1]

0

[1]

0

[1]

0

[1]

'

'

Restructured loans

0

[1]

0

[1]

0

[1]

0

[1]

'

'

Commercial construction | Commercial real-estate | Modification to Interest Only Payments [Member]

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1]

0

[1]

0

[1]

3

[1]

'

'

Restructured loans

0

[1]

0

[1]

0

[1]

6,120

[1]

'

'

Commercial construction | Commercial real-estate | Forgiveness of Debt [Member]

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1]

0

[1]

0

[1]

0

[1]

'

'

Restructured loans

0

[1]

0

[1]

0

[1]

0

[1]

'

'

Land | Commercial real-estate

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1],[2]

1

[1],[2]

0

[1],[2]

3

[1],[2]

0

[1],[3]

3

[1],[3]

Restructured loans

0

[1],[2]

2,352

[1],[2]

0

[1],[2]

2,639

[1],[2]

0

[1],[3]

2,639

[1],[3]

Land | Commercial real-estate | Extension at Below Market Terms [Member]

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1]

1

[1]

0

[1]

3

[1]

'

'

Restructured loans

0

[1]

2,352

[1]

0

[1]

2,639

[1]

'

'

Land | Commercial real-estate | Reduction of Interest Rate [Member]

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1]

0

[1]

0

[1]

2

[1]

'

'

Restructured loans

0

[1]

0

[1]

0

[1]

287

[1]

'

'

Land | Commercial real-estate | Modification to Interest Only Payments [Member]

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1]

0

[1]

0

[1]

0

[1]

'

'

Restructured loans

0

[1]

0

[1]

0

[1]

0

[1]

'

'

Land | Commercial real-estate | Forgiveness of Debt [Member]

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1]

0

[1]

0

[1]

1

[1]

'

'

Restructured loans

0

[1]

0

[1]

0

[1]

73

[1]

'

'

Office | Commercial real-estate

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1],[2]

1

[1],[2]

1

[1],[2]

4

[1],[2]

1

[1],[3]

4

[1],[3]

Restructured loans

0

[1],[2]

556

[1],[2]

790

[1],[2]

4,021

[1],[2]

790

[1],[3]

4,021

[1],[3]

Office | Commercial real-estate | Extension at Below Market Terms [Member]

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1]

1

[1]

1

[1]

4

[1]

'

'

Restructured loans

0

[1]

556

[1]

790

[1]

4,021

[1]

'

'

Office | Commercial real-estate | Reduction of Interest Rate [Member]

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1]

1

[1]

0

[1]

1

[1]

'

'

Restructured loans

0

[1]

556

[1]

0

[1]

556

[1]

'

'

Office | Commercial real-estate | Modification to Interest Only Payments [Member]

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1]

0

[1]

0

[1]

0

[1]

'

'

Restructured loans

0

[1]

0

[1]

0

[1]

0

[1]

'

'

Office | Commercial real-estate | Forgiveness of Debt [Member]

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1]

0

[1]

0

[1]

0

[1]

'

'

Restructured loans

0

[1]

0

[1]

0

[1]

0

[1]

'

'

Industrial | Commercial real-estate

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1],[2]

0

[1],[2]

1

[1],[2]

1

[1],[2]

1

[1],[3]

2

[1],[3]

Restructured loans

0

[1],[2]

0

[1],[2]

1,078

[1],[2]

949

[1],[2]

1,078

[1],[3]

1,676

[1],[3]

Industrial | Commercial real-estate | Extension at Below Market Terms [Member]

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1]

0

[1]

1

[1]

1

[1]

'

'

Restructured loans

0

[1]

0

[1]

1,078

[1]

949

[1]

'

'

Industrial | Commercial real-estate | Reduction of Interest Rate [Member]

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1]

0

[1]

0

[1]

1

[1]

'

'

Restructured loans

0

[1]

0

[1]

0

[1]

949

[1]

'

'

Industrial | Commercial real-estate | Modification to Interest Only Payments [Member]

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1]

0

[1]

1

[1]

0

[1]

'

'

Restructured loans

0

[1]

0

[1]

1,078

[1]

0

[1]

'

'

Industrial | Commercial real-estate | Forgiveness of Debt [Member]

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1]

0

[1]

0

[1]

0

[1]

'

'

Restructured loans

0

[1]

0

[1]

0

[1]

0

[1]

'

'

Retail | Commercial real-estate

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1],[2]

0

[1],[2]

1

[1],[2]

1

[1],[2]

1

[1],[3]

2

[1],[3]

Restructured loans

0

[1],[2]

0

[1],[2]

202

[1],[2]

200

[1],[2]

202

[1],[3]

431

[1],[3]

Retail | Commercial real-estate | Extension at Below Market Terms [Member]

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1]

0

[1]

1

[1]

1

[1]

'

'

Restructured loans

0

[1]

0

[1]

202

[1]

200

[1]

'

'

Retail | Commercial real-estate | Reduction of Interest Rate [Member]

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1]

0

[1]

0

[1]

1

[1]

'

'

Restructured loans

0

[1]

0

[1]

0

[1]

200

[1]

'

'

Retail | Commercial real-estate | Modification to Interest Only Payments [Member]

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1]

0

[1]

0

[1]

0

[1]

'

'

Restructured loans

0

[1]

0

[1]

0

[1]

0

[1]

'

'

Retail | Commercial real-estate | Forgiveness of Debt [Member]

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1]

0

[1]

0

[1]

0

[1]

'

'

Restructured loans

0

[1]

0

[1]

0

[1]

0

[1]

'

'

Multi-family | Commercial real-estate

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1],[2]

0

[1],[2]

1

[1],[2]

1

[1],[2]

1

[1],[3]

1

[1],[3]

Restructured loans

0

[1],[2]

0

[1],[2]

181

[1],[2]

705

[1],[2]

181

[1],[3]

705

[1],[3]

Multi-family | Commercial real-estate | Extension at Below Market Terms [Member]

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1]

0

[1]

0

[1]

1

[1]

'

'

Restructured loans

0

[1]

0

[1]

0

[1]

705

[1]

'

'

Multi-family | Commercial real-estate | Reduction of Interest Rate [Member]

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1]

0

[1]

1

[1]

1

[1]

'

'

Restructured loans

0

[1]

0

[1]

181

[1]

705

[1]

'

'

Multi-family | Commercial real-estate | Modification to Interest Only Payments [Member]

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1]

0

[1]

0

[1]

0

[1]

'

'

Restructured loans

0

[1]

0

[1]

0

[1]

0

[1]

'

'

Multi-family | Commercial real-estate | Forgiveness of Debt [Member]

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1]

0

[1]

0

[1]

0

[1]

'

'

Restructured loans

0

[1]

0

[1]

0

[1]

0

[1]

'

'

Mixed use and other | Commercial real-estate

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1],[2]

1

[1],[2]

7

[1],[2]

3

[1],[2]

10

[1],[3]

5

[1],[3]

Restructured loans

0

[1],[2]

95

[1],[2]

4,926

[1],[2]

3,628

[1],[2]

6,341

[1],[3]

4,217

[1],[3]

Mixed use and other | Commercial real-estate | Extension at Below Market Terms [Member]

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1]

1

[1]

3

[1]

3

[1]

'

'

Restructured loans

0

[1]

95

[1]

2,837

[1]

3,628

[1]

'

'

Mixed use and other | Commercial real-estate | Reduction of Interest Rate [Member]

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1]

0

[1]

7

[1]

2

[1]

'

'

Restructured loans

0

[1]

0

[1]

4,926

[1]

3,533

[1]

'

'

Mixed use and other | Commercial real-estate | Modification to Interest Only Payments [Member]

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1]

0

[1]

1

[1]

0

[1]

'

'

Restructured loans

0

[1]

0

[1]

1,273

[1]

0

[1]

'

'

Mixed use and other | Commercial real-estate | Forgiveness of Debt [Member]

'

'

'

'

'

'

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1]

0

[1]

0

[1]

0

[1]

'

'

Restructured loans

$0

[1]

$0

[1]

$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

9 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

contracts

contracts

contracts

contracts

contracts

contracts

Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]

'

'

'

'

'

'

Total, Count

3

[1],[2]

4

[1],[2]

16

[1],[2]

30

[1],[2]

21

[1],[3]

37

[1],[3]

Total, Balance

$667

[1],[2]

$4,003

[1],[2]

$8,152

[1],[2]

$20,748

[1],[2]

$10,086

[1],[3]

$23,407

[1],[3]

Payments in Default, Count

6

[1],[4]

6

[1],[4]

6

[1],[4]

9

[1],[4]

'

'

Payments in Default, Balance

2,028

[1],[4]

2,972

[1],[4]

2,028

[1],[4]

3,970

[1],[4]

'

'

Residential real estate and other

'

'

'

'

'

'

Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]

'

'

'

'

'

'

Total, Count

3

[1],[2]

1

[1],[2]

4

[1],[2]

8

[1],[2]

6

[1],[3]

9

[1],[3]

Total, Balance

667

[1],[2]

1,000

[1],[2]

887

[1],[2]

1,778

[1],[2]

1,406

[1],[3]

1,904

[1],[3]

Payments in Default, Count

2

[1],[4]

1

[1],[4]

2

[1],[4]

1

[1],[4]

'

'

Payments in Default, Balance

380

[1],[4]

126

[1],[4]

380

[1],[4]

126

[1],[4]

'

'

Commercial and industrial | Commercial

'

'

'

'

'

'

Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]

'

'

'

'

'

'

Total, Count

0

[1],[2]

0

[1],[2]

1

[1],[2]

6

[1],[2]

1

[1],[3]

8

[1],[3]

Total, Balance

0

[1],[2]

0

[1],[2]

88

[1],[2]

708

[1],[2]

88

[1],[3]

1,694

[1],[3]

Payments in Default, Count

1

[1],[4]

1

[1],[4]

1

[1],[4]

2

[1],[4]

'

'

Payments in Default, Balance

88

[1],[4]

161

[1],[4]

88

[1],[4]

181

[1],[4]

'

'

Commercial construction | Commercial real-estate

'

'

'

'

'

'

Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]

'

'

'

'

'

'

Total, Count

0

[1],[2]

0

[1],[2]

0

[1],[2]

3

[1],[2]

0

[1],[3]

3

[1],[3]

Total, Balance

0

[1],[2]

0

[1],[2]

0

[1],[2]

6,120

[1],[2]

0

[1],[3]

6,120

[1],[3]

Payments in Default, Count

0

[1],[4]

0

[1],[4]

0

[1],[4]

0

[1],[4]

'

'

Payments in Default, Balance

0

[1],[4]

0

[1],[4]

0

[1],[4]

0

[1],[4]

'

'

Land | Commercial real-estate

'

'

'

'

'

'

Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]

'

'

'

'

'

'

Total, Count

0

[1],[2]

1

[1],[2]

0

[1],[2]

3

[1],[2]

0

[1],[3]

3

[1],[3]

Total, Balance

0

[1],[2]

2,352

[1],[2]

0

[1],[2]

2,639

[1],[2]

0

[1],[3]

2,639

[1],[3]

Payments in Default, Count

0

[1],[4]

1

[1],[4]

0

[1],[4]

1

[1],[4]

'

'

Payments in Default, Balance

0

[1],[4]

215

[1],[4]

0

[1],[4]

215

[1],[4]

'

'

Office | Commercial real-estate

'

'

'

'

'

'

Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]

'

'

'

'

'

'

Total, Count

0

[1],[2]

1

[1],[2]

1

[1],[2]

4

[1],[2]

1

[1],[3]

4

[1],[3]

Total, Balance

0

[1],[2]

556

[1],[2]

790

[1],[2]

4,021

[1],[2]

790

[1],[3]

4,021

[1],[3]

Payments in Default, Count

0

[1],[4]

1

[1],[4]

0

[1],[4]

1

[1],[4]

'

'

Payments in Default, Balance

0

[1],[4]

1,648

[1],[4]

0

[1],[4]

1,648

[1],[4]

'

'

Industrial | Commercial real-estate

'

'

'

'

'

'

Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]

'

'

'

'

'

'

Total, Count

0

[1],[2]

0

[1],[2]

1

[1],[2]

1

[1],[2]

1

[1],[3]

2

[1],[3]

Total, Balance

0

[1],[2]

0

[1],[2]

1,078

[1],[2]

949

[1],[2]

1,078

[1],[3]

1,676

[1],[3]

Payments in Default, Count

1

[1],[4]

1

[1],[4]

1

[1],[4]

1

[1],[4]

'

'

Payments in Default, Balance

1,078

[1],[4]

727

[1],[4]

1,078

[1],[4]

727

[1],[4]

'

'

Retail | Commercial real-estate

'

'

'

'

'

'

Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]

'

'

'

'

'

'

Total, Count

0

[1],[2]

0

[1],[2]

1

[1],[2]

1

[1],[2]

1

[1],[3]

2

[1],[3]

Total, Balance

0

[1],[2]

0

[1],[2]

202

[1],[2]

200

[1],[2]

202

[1],[3]

431

[1],[3]

Payments in Default, Count

0

[1],[4]

0

[1],[4]

0

[1],[4]

0

[1],[4]

'

'

Payments in Default, Balance

0

[1],[4]

0

[1],[4]

0

[1],[4]

0

[1],[4]

'

'

Multi-family | Commercial real-estate

'

'

'

'

'

'

Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]

'

'

'

'

'

'

Total, Count

0

[1],[2]

0

[1],[2]

1

[1],[2]

1

[1],[2]

1

[1],[3]

1

[1],[3]

Total, Balance

0

[1],[2]

0

[1],[2]

181

[1],[2]

705

[1],[2]

181

[1],[3]

705

[1],[3]

Payments in Default, Count

0

[1],[4]

0

[1],[4]

0

[1],[4]

1

[1],[4]

'

'

Payments in Default, Balance

0

[1],[4]

0

[1],[4]

0

[1],[4]

705

[1],[4]

'

'

Mixed use and other | Commercial real-estate

'

'

'

'

'

'

Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]

'

'

'

'

'

'

Total, Count

0

[1],[2]

1

[1],[2]

7

[1],[2]

3

[1],[2]

10

[1],[3]

5

[1],[3]

Total, Balance

0

[1],[2]

95

[1],[2]

4,926

[1],[2]

3,628

[1],[2]

6,341

[1],[3]

4,217

[1],[3]

Payments in Default, Count

2

[1],[4]

1

[1],[4]

2

[1],[4]

2

[1],[4]

'

'

Payments in Default, Balance

$482

[1],[4]

$95

[1],[4]

$482

[1],[4]

$368

[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

9 Months Ended

12 Months Ended

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

contracts

contracts

contracts

contracts

contracts

contracts

Financing Receivable, Allowance for Credit Losses [Line Items]

'

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

3

[1],[2]

4

[1],[2]

16

[1],[2]

30

[1],[2]

21

[1],[3]

37

[1],[3]

'

Allowance for loan losses related to impaired loans

$6,577,000

$14,329,000

$6,577,000

$14,329,000

$6,577,000

$14,329,000

$8,265,000

Restructured loans

667,000

[1],[2]

4,003,000

[1],[2]

8,152,000

[1],[2]

20,748,000

[1],[2]

10,086,000

[1],[3]

23,407,000

[1],[3]

'

Weighted average extension term

'18 months

'26 months

'14 months

'19 months

'

'

'

Weighted average stated interest rate, basis points

2.61%

1.50%

1.78%

1.99%

'

'

'

Weighted average interest only term

'

'

'9 months

'11 months

'

'

'

Loan forgiveness

0

1,000,000

0

1,000,000

'

'

'

Financing Receivable [Member]

'

'

'

'

'

'

'

Financing Receivable, Allowance for Credit Losses [Line Items]

'

'

'

'

'

'

'

Restructured loans

83,385,000

115,003,000

83,385,000

115,003,000

83,385,000

115,003,000

107,103,000

Troubled debt restructuring modifications, number of count

'

'

145

'

'

'

'

Allowance for loan losses related to impaired loans

2,000,000

'

2,000,000

'

2,000,000

'

'

Interest income, passage of time

294,000

205,000

529,000

727,000

'

'

'

Modification to Interest Only Payments [Member]

'

'

'

'

'

'

'

Financing Receivable, Allowance for Credit Losses [Line Items]

'

'

'

'

'

'

'

Troubled debt restructuring modifications, number of count

0

[1]

0

[1]

4

[1]

7

[1]

'

'

'

Restructured loans

$0

[1]

$0

[1]

$2,659,000

[1]

$6,539,000

[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 $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Goodwill [Roll Forward]	'	'
Beginning balance	$374,547,000	$357,309,000
Goodwill Acquired	33,234,000	'
Impairment Loss	0	'
Goodwill Adjustments	-1,177,000	'
Ending balance	406,604,000	357,309,000
Community banking	'	'
Goodwill [Roll Forward]	'	'
Beginning balance	305,313,000	'
Goodwill Acquired	26,439,000	'
Impairment Loss	0	'
Goodwill Adjustments	0	'
Ending balance	331,752,000	'
Specialty finance	'	'
Goodwill [Roll Forward]	'	'
Beginning balance	37,370,000	'
Goodwill Acquired	6,545,000	'
Impairment Loss	0	'
Goodwill Adjustments	-1,177,000	'
Ending balance	42,738,000	'
Wealth management	'	'
Goodwill [Roll Forward]	'	'
Beginning balance	31,864,000	'
Goodwill Acquired	250,000	'
Impairment Loss	0	'
Goodwill Adjustments	0	'
Ending balance	$32,114,000	'

Recovered_Sheet3

Goodwill And Other Intangible Assets (Summary of Finite-Lived Intangible Assets) (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
In Thousands, unless otherwise specified
Finite-Lived Intangible Assets [Line Items]	'	'	'
Other intangible assets	$19,984	$19,213	$18,982
Core deposit intangibles | Community banking	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'
Gross carrying amount	40,438	40,770	39,350
Accumulated amortization	-27,909	-29,189	-28,143
Net carrying amount	12,529	11,581	11,207
Customer list intangibles | Specialty finance	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'
Gross carrying amount	1,800	1,800	1,800
Accumulated amortization	-910	-805	-769
Net carrying amount	890	995	1,031
Customer list and other intangibles | Wealth management	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'
Gross carrying amount	7,940	7,690	7,690
Accumulated amortization	-1,375	-1,053	-946
Net carrying amount	$6,565	$6,637	$6,744

Goodwill_And_Other_Intangible_2

Goodwill And Other Intangible Assets (Estimated Amortization) (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'	'	'	'
Actual in nine months ended September 30, 2014	$1,202	$1,154	$3,521	$3,438
Estimated remaining in 2014	1,171	'	1,171	'
Estimated-2015	3,519	'	3,519	'
Estimated-2016	2,833	'	2,833	'
Estimated-2017	2,346	'	2,346	'
Estimated-2018	$2,052	'	$2,052	'

Goodwill_And_Other_Intangible_3

Goodwill And Other Intangible Assets (Narrative) (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Indefinite-lived Intangible Assets [Line Items]	'	'	'	'
Amortization of other intangible assets	$1,202,000	$1,154,000	$3,521,000	$3,438,000
Community banking	'	'	'	'
Indefinite-lived Intangible Assets [Line Items]	'	'	'	'
Goodwill, Period Increase (Decrease)	'	'	26,400,000	'
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)	'	'	5,400,000	'
Specialty finance | Customer list intangibles	'	'	'	'
Indefinite-lived Intangible Assets [Line Items]	'	'	'	'
Amortization period in years, core deposit intangibles	'	'	'18 years	'
Wealth management	'	'	'	'
Indefinite-lived Intangible Assets [Line Items]	'	'	'	'
Goodwill, Period Increase (Decrease)	'	'	$250,000	'
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 $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
In Thousands, unless otherwise specified
Deposits [Abstract]	'	'	'
Non-interest bearing	$3,253,477	$2,721,771	$2,622,518
NOW and interest bearing demand deposits	2,086,099	1,953,882	1,922,906
Wealth management deposits	1,212,317	1,013,850	1,099,509
Money market	3,744,682	3,359,999	3,423,413
Savings	1,465,250	1,392,575	1,318,147
Time certificates of deposit	4,303,421	4,226,712	4,260,953
Total deposits	$16,065,246	$14,668,789	$14,647,446
Non-interest bearing, Mix	20.00%	19.00%	18.00%
NOW and Interest Bearing Demand Deposits, Mix	13.00%	13.00%	13.00%
Wealth management deposits, Mix	8.00%	7.00%	8.00%
Money market, Mix	23.00%	23.00%	23.00%
Savings, Mix	9.00%	9.00%	9.00%
Time certificates of deposit, Mix	27.00%	29.00%	29.00%
Total deposits, Mix	100.00%	100.00%	100.00%

Federal_Home_Loan_Bank_Advance2

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 $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
In Thousands, unless otherwise specified
Debt Disclosure [Abstract]	'	'	'
Federal Home Loan Bank advances	$347,500	$417,762	$387,852
Notes payable	0	364	1,546
Securities sold under repurchase agreements	32,530	235,347	223,211
Other	18,953	19,393	23,659
Total other borrowings	51,483	255,104	248,416
Subordinated notes	140,000	0	10,000
Total Federal Home Loan Bank advances, other borrowings and subordinated notes	$538,983	$672,866	$646,268

Federal_Home_Loan_Bank_Advance3

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

1 Months Ended

3 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

12 Months Ended

3 Months Ended

9 Months Ended

0 Months Ended

9 Months Ended

12 Months Ended

9 Months Ended

1 Months Ended

9 Months Ended

Nov. 30, 2013

Jun. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

Sep. 30, 2013

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Sep. 30, 2014

Mar. 15, 2011

Sep. 30, 2014

Dec. 31, 2013

Dec. 31, 2010

Dec. 15, 2013

Dec. 07, 2010

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Nov. 30, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

subordinated_notes

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Revolving credit facility

Revolving credit facility

Revolving credit facility

Notes Payable to Banks [Member]

Notes Payable to Banks [Member]

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 Amortizing Notes [Member]

Junior Subordinated Amortizing Notes [Member]

Junior Subordinated Amortizing Notes [Member]

Junior Subordinated Amortizing Notes [Member]

Junior Subordinated Amortizing Notes [Member]

Junior Subordinated Amortizing Notes [Member]

Subordinated Debt [Member]

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

Federal Funds Rate [Member]

London Interbank Offered Rate (LIBOR) [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]

Unsecured Debt [Member]

Subordinated Debt [Member]

Federal Funds Rate [Member]

Base Rate [Member]

Prime Rate [Member]

Eurodollar Rate [Member]

Base Rate [Member]

London Interbank Offered Rate (LIBOR) [Member]

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Notes payable

'

'

$0

$1,546,000

$364,000

'

$364,000

$546,000

$0

$0

$0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Frequency of Periodic Payment

'

'

'

'

'

'quarterly

'

'

'quarterly

'

'

'

'

'

'

'

'

'

'

'monthly

'

'

'quarterly

'

'

'

'

'

'

'

'

'

'

'

'

'

Incremental interest rate over base rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1.00%

1.30%

1.00%

'

0.50%

1.50%

'

2.50%

Loan agreement with unaffiliated banks, amount

'

'

'

101,000,000

'

'

'

'

'

'

'

1,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Revolving Credit Facility

'

'

'

'

'

'

'

'

100,000,000

100,000,000

100,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Maturity Date

'

'

'

'

'

'

'

'

6-Nov-14

25-Oct-13

'

1-Jun-15

'

'

'

'

'

'

'

1-Sep-17

'

'

15-Dec-13

15-Dec-13

'

'

13-Jun-24

31-May-15

'

'

'

'

'

'

'

'

Proceeds from (Repayments of) Other Debt

'

'

-203,621,000

-29,009,000

'

'

'

'

'

'

'

'

-1,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3.50%

'

'

3.50%

'

Commitment fee payment

'

'

'

'

'

'

'

'

0.38%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Securities sold under repurchase agreements

'

'

32,530,000

223,211,000

235,347,000

'

'

'

'

'

'

'

'

32,500,000

55,300,000

43,200,000

'

180,000,000

180,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Repayments of Short-term Debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

180,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

'

'

'

'

'

'

'

'

'

'

'

'

53,400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net Credit Exposure Repurchase Agreements

'

'

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Issuance Date

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

31-Aug-12

'

31-Dec-10

'

'

'

'

'

31-Oct-05

'

'

'

'

'

'

'

'

Fixed Rate Promissory Note

'

'

18,953,000

23,659,000

19,393,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

19,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Contractual rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3.75%

'

'

'

'

9.50%

'

5.00%

'

'

'

'

'

'

'

'

'

Junior subordinated notes

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

44,700,000

'

'

'

'

'

'

'

'

'

'

Quarterly principal and interest payments

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Initial Payment

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Subordinated notes

'

'

140,000,000

10,000,000

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

10,000,000

'

'

'

'

'

'

'

'

Subordinated Debt Issued, Gross

'

140,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from issuance of subordinated notes, net

'

139,100,000

139,090,000

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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 $)

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 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

Junior Subordinated Debt [Member]

London Interbank Offered Rate (LIBOR) [Member]

London Interbank Offered Rate (LIBOR) [Member]

London Interbank Offered Rate (LIBOR) [Member]

London Interbank Offered Rate (LIBOR) [Member]

London Interbank Offered Rate (LIBOR) [Member]

London Interbank Offered Rate (LIBOR) [Member]

London Interbank Offered Rate (LIBOR) [Member]

London Interbank Offered Rate (LIBOR) [Member]

London Interbank Offered Rate (LIBOR) [Member]

Rate

Rate

Rate

Rate

Rate

Rate

Rate

Rate

Rate

Rate

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

'

'

'

3.48%

3.03%

2.83%

2.18%

1.68%

1.86%

3.24%

3.24%

3.23%

'

'

'

'

'

'

'

'

'

'

Debt, weighted average interest rate

'

'

'

'

'

'

'

'

'

'

'

'

2.42%

'

'

'

'

'

'

'

'

'

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 $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014	Sep. 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	'	'	'	3.11%	'	'	'
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		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]	'	'	'	'	'
Total net interest income	$151,670	$141,782	$444,856	$408,319	'
Total net interest income, Change in Contribution	9,888	'	36,537	'	'
Total net interest income, Change in Contribution Percentage	7.00%	'	9.00%	'	'
Total non-interest income	57,952	54,662	157,583	176,036	'
Total non-interest income, Change in Contribution	3,290	'	-18,453	'	'
Total non-interest income, Change in Contribution Percentage	6.00%	'	-10.00%	'	'
Total net revenue	209,622	196,444	602,439	584,355	'
Total net revenue, Change in Contribution	13,178	'	18,084	'	'
Total net revenue, Change in Contribution Percentage	7.00%	'	3.00%	'	'
Total segment profit	40,224	35,563	113,265	101,922	'
Total segment profit, Change in Contribution	4,661	'	11,343	'	'
Total segment profit, Change in Contribution Percentage	13.00%	'	11.00%	'	'
Total assets	19,169,345	17,682,548	19,169,345	17,682,548	18,097,783
Total segment assets, Change in Contribution	1,486,797	'	'	'	'
Total segment assets, Change in Contribution Percentage	8.00%	'	'	'	'
Operating Segments [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total net interest income	147,778	138,193	432,870	397,383	'
Total net interest income, Change in Contribution	9,585	'	35,487	'	'
Total net interest income, Change in Contribution Percentage	7.00%	'	9.00%	'	'
Total non-interest income	64,785	60,947	177,953	194,534	'
Total non-interest income, Change in Contribution	3,838	'	-16,581	'	'
Total non-interest income, Change in Contribution Percentage	6.00%	'	-9.00%	'	'
Total net revenue	212,563	199,140	610,823	591,917	'
Total net revenue, Change in Contribution	13,423	'	18,906	'	'
Total net revenue, Change in Contribution Percentage	7.00%	'	3.00%	'	'
Operating Segments [Member] | Community banking	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total net interest income	121,998	115,199	359,981	332,795	'
Total net interest income, Change in Contribution	6,799	'	27,186	'	'
Total net interest income, Change in Contribution Percentage	6.00%	'	8.00%	'	'
Total non-interest income	38,274	36,659	98,930	122,625	'
Total non-interest income, Change in Contribution	1,615	'	-23,695	'	'
Total non-interest income, Change in Contribution Percentage	4.00%	'	-19.00%	'	'
Total net revenue	160,272	151,858	458,911	455,420	'
Total net revenue, Change in Contribution	8,414	'	3,491	'	'
Total net revenue, Change in Contribution Percentage	6.00%	'	1.00%	'	'
Total segment profit	26,184	22,754	73,393	65,728	'
Total segment profit, Change in Contribution	3,430	'	7,665	'	'
Total segment profit, Change in Contribution Percentage	15.00%	'	12.00%	'	'
Total assets	15,945,744	14,741,147	15,945,744	14,741,147	'
Total segment assets, Change in Contribution	1,204,597	'	'	'	'
Total segment assets, Change in Contribution Percentage	8.00%	'	'	'	'
Operating Segments [Member] | Specialty finance	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total net interest income	21,903	19,327	60,907	54,193	'
Total net interest income, Change in Contribution	2,576	'	6,714	'	'
Total net interest income, Change in Contribution Percentage	13.00%	'	12.00%	'	'
Total non-interest income	8,320	7,821	24,656	23,318	'
Total non-interest income, Change in Contribution	499	'	1,338	'	'
Total non-interest income, Change in Contribution Percentage	6.00%	'	6.00%	'	'
Total net revenue	30,223	27,148	85,563	77,511	'
Total net revenue, Change in Contribution	3,075	'	8,052	'	'
Total net revenue, Change in Contribution Percentage	11.00%	'	10.00%	'	'
Total segment profit	10,973	10,022	30,257	28,343	'
Total segment profit, Change in Contribution	951	'	1,914	'	'
Total segment profit, Change in Contribution Percentage	9.00%	'	7.00%	'	'
Total assets	2,704,591	2,451,727	2,704,591	2,451,727	'
Total segment assets, Change in Contribution	252,864	'	'	'	'
Total segment assets, Change in Contribution Percentage	10.00%	'	'	'	'
Operating Segments [Member] | Wealth management	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total net interest income	3,877	3,667	11,982	10,395	'
Total net interest income, Change in Contribution	210	'	1,587	'	'
Total net interest income, Change in Contribution Percentage	6.00%	'	15.00%	'	'
Total non-interest income	18,191	16,467	54,367	48,591	'
Total non-interest income, Change in Contribution	1,724	'	5,776	'	'
Total non-interest income, Change in Contribution Percentage	10.00%	'	12.00%	'	'
Total net revenue	22,068	20,134	66,349	58,986	'
Total net revenue, Change in Contribution	1,934	'	7,363	'	'
Total net revenue, Change in Contribution Percentage	10.00%	'	12.00%	'	'
Total segment profit	3,067	2,787	9,615	7,851	'
Total segment profit, Change in Contribution	280	'	1,764	'	'
Total segment profit, Change in Contribution Percentage	10.00%	'	22.00%	'	'
Total assets	519,010	489,674	519,010	489,674	'
Total segment assets, Change in Contribution	29,336	'	'	'	'
Total segment assets, Change in Contribution Percentage	6.00%	'	'	'	'
Intersegment Eliminations [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total net interest income	3,892	3,589	11,986	10,936	'
Total net interest income, Change in Contribution	303	'	1,050	'	'
Total net interest income, Change in Contribution Percentage	8.00%	'	10.00%	'	'
Total non-interest income	-6,833	-6,285	-20,370	-18,498	'
Total non-interest income, Change in Contribution	-548	'	-1,872	'	'
Total non-interest income, Change in Contribution Percentage	-9.00%	'	-10.00%	'	'
Total net revenue	-2,941	-2,696	-8,384	-7,562	'
Total net revenue, Change in Contribution	($245)	'	($822)	'	'
Total net revenue, Change in Contribution Percentage	-9.00%	'	-11.00%	'	'

Derivative_Financial_Instrumen2

Derivative Financial Instruments Derivative Financial Instruments (Interest Rate Cap Derivative Summary) (Detail) (USD $)	Sep. 30, 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	205
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	165
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	812
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	350
Total Interest Rate Cap [Member]	'
Interest Rate Cap Derivative Summary [Line Items]	'
Notional amount	970,030
Fair Value as of End of Period	3,479
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	484
Cash Flow Hedging [Member] | Interest Rate Cap Forty Three 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	43,500
Fair Value as of End of Period	127
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	728
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	608
Cash Flow Hedging [Member] | Total Interest Rate Cap [Member] | Designated as Hedging Instrument [Member]	'
Interest Rate Cap Derivative Summary [Line Items]	'
Notional amount	350,000
Fair Value as of End of Period	$1,947

Derivative_Financial_Instrumen3

Derivative Financial Instruments Derivative Financial Instruments (Schedule Of Fair Value Of Derivative Financial Instruments) (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
In Thousands, unless otherwise specified
Derivative [Line Items]	'	'	'
Derivative Assets, Fair Value, Amount not Offset Against Collateral	$33,275	$37,956	$41,945
Derivative Liabilities, Fair Value, Amount Not Offset Against Collateral	31,451	34,807	38,804
Other Assets [Member]	'	'	'
Derivative [Line Items]	'	'	'
Derivative Assets, Fair Value, Amount not Offset Against Collateral	43,343	48,221	57,573
Other Assets [Member] | Designated as Hedging Instrument [Member]	'	'	'
Derivative [Line Items]	'	'	'
Derivative Assets, Fair Value, Amount not Offset Against Collateral	2,026	1,883	1,820
Other Assets [Member] | Not Designated as Hedging Instrument [Member]	'	'	'
Derivative [Line Items]	'	'	'
Derivative Assets, Fair Value, Amount not Offset Against Collateral	41,317	46,338	55,753
Other Liabilities [Member]	'	'	'
Derivative [Line Items]	'	'	'
Derivative Liabilities, Fair Value, Amount Not Offset Against Collateral	35,505	37,264	49,300
Other Liabilities [Member] | Designated as Hedging Instrument [Member]	'	'	'
Derivative [Line Items]	'	'	'
Derivative Liabilities, Fair Value, Amount Not Offset Against Collateral	2,202	3,161	3,446
Other Liabilities [Member] | Not Designated as Hedging Instrument [Member]	'	'	'
Derivative [Line Items]	'	'	'
Derivative Liabilities, Fair Value, Amount Not Offset Against Collateral	33,303	34,103	45,854
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	31,249	36,073	40,125
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	29,249	31,646	35,358
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	1,947	1,776	1,738
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	2,202	3,160	3,444
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	79	107	82
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	0	1	2
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	10,010	7,500	15,599
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	31	147	5,097
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	41	2,761	23
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	3,986	2,310	5,373
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	17	4	6
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	$37	$0	$26

Derivative_Financial_Instrumen4

Derivative Financial Instruments Derivative Financial Instruments (Schedule Of Cash Flow Hedging Instruments) (Detail) (USD $)	Sep. 30, 2014
In Thousands, unless otherwise specified
Total Interest Rate Cap [Member]	'
Derivative [Line Items]	'
Notional amount	$970,030
Fair Value Asset (Liability)	3,479
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)	-1,450
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)	-752
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)	-2,202
Cash Flow Hedging [Member] | Interest Rate Cap Forty Three Million Five Hundred Thousand Notional August Two Thousand Sixteen Maturity [Member] | Designated as Hedging Instrument [Member]	'
Derivative [Line Items]	'
Notional amount	43,500
Fair Value Asset (Liability)	127
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]	'
Derivative [Line Items]	'
Notional amount	216,500
Fair Value Asset (Liability)	484
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)	728
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)	608
Cash Flow Hedging [Member] | Total Interest Rate Cap [Member] | Designated as Hedging Instrument [Member]	'
Derivative [Line Items]	'
Notional amount	350,000
Fair Value Asset (Liability)	1,947
Cash Flow Hedging [Member] | Interest Rate Swaps and Caps [Member] | Designated as Hedging Instrument [Member]	'
Derivative [Line Items]	'
Notional amount	425,000
Fair Value Asset (Liability)	($255)

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		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Interest Rate Contract [Member]	'	'	'	'
Rollforward of AOCI from Cash Flow Hedging Derivatives [Roll Forward]	'	'	'	'
Unrealized loss at beginning of period	($4,695)	($5,030)	($3,971)	($8,673)
Amount reclassified from accumulated other comprehensive income to interest expense on junior subordinated debentures	553	1,507	1,567	4,629
Amount of loss recognized in other comprehensive income	418	-859	-1,320	-338
Unrealized loss at end of period	($3,724)	($4,382)	($3,724)	($4,382)

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		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 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	$16	($14)	($27)	$42
Amount of Gain or (Loss) Recognized in Income on Hedged Item	-16	14	24	-33
Income Statement Gain/(Loss) due to Hedge Ineffectiveness	$0	$0	($3)	$9

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		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Interest Rate Swaps and Caps [Member] | Trading Revenue [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Derivative, Gain (Loss) on Derivative, Net	$270	($1,738)	($1,144)	$1,182
Mortgage Banking Derivatives [Member] | Mortgage Banking Revenue [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Derivative, Gain (Loss) on Derivative, Net	-562	-6,644	-1,770	4,352
Covered Call Options [Member] | Fees From Covered Call Options [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Derivative, Gain (Loss) on Derivative, Net	2,107	285	4,893	2,917
Foreign Exchange Contract [Member] | Trading Revenue [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Derivative, Gain (Loss) on Derivative, Net	($12)	$33	($23)	($34)

Derivative_Financial_Instrumen8

Derivative Financial Instruments Derivative Financial Instruments (Derivative Asset and Liability Balance Sheet Offsetting) (Detail) (USD $)	Sep. 30, 2014		Dec. 31, 2013		Sep. 30, 2013
Derivative Assets	'		'		'
Gross Amounts Recognized	$33,275,000		$37,956,000		$41,945,000
Less: Amounts offset in the Statements of Financial Condition	0		0		0
Net amount presented in the Statements of Financial Condition	33,275,000		37,956,000		41,945,000
Offsetting Derivative Positions	-5,417,000		-8,826,000		-6,362,000
Securities Collateral Posted	0		0		0
Net Credit Exposure	27,858,000		29,130,000		35,583,000
Derivative Liabilities	'		'		'
Gross Amounts Recognized	31,451,000		34,807,000		38,804,000
Less: Amounts offset in the Statements of Financial Condition	0		0		0
Net amount presented in the Statements of Financial Condition	31,451,000		34,807,000		38,804,000
Offsetting Derivative Positions	-5,417,000		-8,826,000		-6,362,000
Securities Collateral Posted	-26,034,000	[1]	-25,981,000	[1]	-28,620,000
Net Credit Exposure	0		0		3,822,000
Security Owned and Pledged as Collateral, Fair Value	$33,900,000		$34,600,000		'
[1]	As of SeptemberB 30, 2014 and December 31, 2013, the Company posted securities collateral of $33.9 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

9 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

9 Months Ended

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2014

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]

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]

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]

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]

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]

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]

derivative_instruments

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

2

Notional amount

'

'

'

'

$96,500,000

$620,000,000

$3,000,000,000

$599,200,000

$322,700,000

$3,200,000

'

'

'

'

'

'

'

$5,200,000

'

'

'

'

'

$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

'

1,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Income Statement Gain/(Loss) due to Hedge Ineffectiveness

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

0

-3,000

9,000

'

'

'

'

'

'

Basis Amortization of Hedged item no longer in a Hedging Relationship

43,000

129,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative, maturity date

'

'

'

'

'

'

'

'

'

'

'

'

'

30-Nov-14

31-Jan-33

'

'

'

'

'

'

'

'

'

'

30-Sep-13

'

'

Loans Held-for-sale, Fair Value Disclosure

363,303,000

363,303,000

334,327,000

334,345,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative, Number of Instruments Held

'

'

'

'

'

'

'

'

'

'

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative, Net Liability Position, Aggregate Fair Value

$25,700,000

$25,700,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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 $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Available-for-sale securities, at fair value	$1,782,648	$2,176,290	$1,781,883
Trading account securities	6,015	497	259
Derivative assets	33,275	37,956	41,945
Derivative liabilities	31,451	34,807	38,804
US Treasury Securities [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Available-for-sale securities, at fair value	378,261	336,095	210,902
U.S. Government Agencies Debt Securities [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Available-for-sale securities, at fair value	739,752	895,688	912,689
Municipal Bonds [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Available-for-sale securities, at fair value	187,103	152,716	150,647
Asset-backed Securities [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Available-for-sale securities, at fair value	291,222	605,225	319,193
Equity Securities [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Available-for-sale securities, at fair value	52,155	51,528	49,271
Fair Value, Measurements, Recurring [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Trading account securities	6,015	497	259
Mortgage loans held-for-sale	363,303	332,485	329,186
Servicing Asset at Fair Value, Amount	8,137	8,946	8,608
Nonqualified deferred compensation assets	7,927	7,222	6,801
Derivative assets	43,343	48,221	57,573
Total	2,211,373	2,573,661	2,184,310
Derivative liabilities	35,505	37,264	49,300
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, at fair value	378,261	336,095	210,902
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, at fair value	739,752	895,688	912,689
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, at fair value	187,103	152,716	150,647
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, at fair value	134,155	135,038	139,181
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, at fair value	291,222	605,225	319,193
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, at fair value	52,155	51,528	49,271
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	'	'	'
Servicing Asset at Fair Value, Amount	'	'	'
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, at fair value	'	'	'
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, at fair value	'	'	'
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, at fair value	'	'	'
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, at fair value	'	'	'
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, at fair value	'	'	'
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, at fair value	'	'	'
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Trading account securities	6,015	497	259
Mortgage loans held-for-sale	363,303	332,485	329,186
Servicing Asset at Fair Value, Amount	0	0	0
Nonqualified deferred compensation assets	7,927	7,222	6,801
Derivative assets	43,343	48,221	57,573
Total	2,129,038	2,506,166	2,122,572
Derivative liabilities	35,505	37,264	49,300
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, at fair value	378,261	336,095	210,902
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, at fair value	739,752	895,688	912,689
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, at fair value	136,866	116,330	117,959
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, at fair value	134,155	135,038	139,181
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, at fair value	291,222	605,225	319,193
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, at fair value	28,194	29,365	28,829
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
Servicing Asset at Fair Value, Amount	8,137	8,946	8,608
Nonqualified deferred compensation assets	0	0	0
Derivative assets	0	0	0
Total	82,335	67,495	61,738
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, at fair value	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, at fair value	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, at fair value	50,237	36,386	32,688
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, at fair value	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, at fair value	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, at fair value	$23,961	$22,163	$20,442

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				9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Mortgage Servicing Rights [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'		'		'
Beginning Balance	$8,227		$8,636		$8,946		$6,750
Total net gains (losses) included in Net income	-90	[1]	-28	[1]	-809	[1]	1,858	[1]
Total net gains (losses) included in Other comprehensive income	'		'		'		'
Purchases	'		'		'		'
issuances	'		'		'		'
Sales	'		'		'		'
Settlements	'		'		'		'
Net transfers into Level 3	'		'		'		'
Ending Balance	8,137		8,608		8,137		8,608
Municipal Bonds [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'		'		'
Beginning Balance	38,053		32,432		36,386		30,770
Total net gains (losses) included in Net income	'		'		'		'
Total net gains (losses) included in Other comprehensive income	-27		-2		193		-316
Purchases	4,129		6,225		9,095		8,572
issuances	'		'		'		'
Sales	'		'		'		'
Settlements	-800		-5,967		-4,319		-6,338
Net transfers into Level 3	8,882	[2]	'		8,882	[2]	'
Ending Balance	50,237		32,688		50,237		32,688
Equity Securities [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'		'		'
Beginning Balance	24,152		22,428		22,163		22,169
Total net gains (losses) included in Net income	'		'		'		'
Total net gains (losses) included in Other comprehensive income	-191		-1,986		1,798		-1,727
Purchases	'		'		'		'
issuances	'		'		'		'
Sales	'		'		'		'
Settlements	'		'		'		'
Net transfers into Level 3	'		'		'		'
Ending Balance	$23,961		$20,442		$23,961		$20,442
[1]	Changes in the balance of mortgage servicing rights are recorded as a component of mortgage banking revenue in non-interest income.
[2]	Transfers into Level 3 relate to a reclassification of municipal bonds in the current quarter.

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		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Fair Value Losses Recognized, Impaired loansbcollateral based	$5,786		$19,483
Fair Value Losses Recognized, Other real estate owned	914	[1]	9,847	[1]
Fair Value Losses Recognized, Total	6,700		29,330
Fair Value, Measurements, Nonrecurring [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Impaired loans - collateral based	60,209		60,209
Other real estate owned	98,945		98,945
Total	159,154		159,154
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		0
Other real estate owned	0		0
Total	0		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		0
Other real estate owned	0		0
Total	0		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	60,209		60,209
Other real estate owned	98,945		98,945
Total	$159,154		$159,154
[1]	Fair value losses recognized, net 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 $)

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Jun. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

In Thousands, unless otherwise specified

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]

Impaired Loans [Member]

Other Real Estate Owned [Member]

Other Real Estate Owned [Member]

Municipal Bonds [Member]

Municipal Bonds [Member]

Municipal Bonds [Member]

Municipal Bonds [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]

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 Discount Rate Input [Member]

Mortgage Servicing Rights Prepayment Rate Input [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]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [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, Nonrecurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Level 3 [Member]

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]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Available-for-sale securities, at fair value

$1,782,648

$2,176,290

$1,781,883

'

'

'

'

'

'

'

'

'

'

'

$187,103

$152,716

$150,647

$187,103

$152,716

$150,647

$50,237

$36,386

$32,688

$52,155

$51,528

$49,271

$52,155

$51,528

$49,271

$23,961

$22,163

$20,442

'

'

'

'

'

'

'

'

'

Servicing Asset at Fair Value, Amount

'

'

'

8,137

8,946

8,608

'

8,137

8,946

8,608

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Impaired loans - collateral based

'

'

'

'

'

'

60,209

'

'

'

60,209

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Other real estate owned

'

'

'

'

'

'

$98,945

'

'

'

$98,945

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Valuation Methodology

'

'

'

'

'

'

'

'

'

'

'

'Appraisal value

'Appraisal value

'

'

'

'

'

'

'

'Bond pricing

'

'

'

'

'

'

'

'

'Discounted cash flows

'

'

'

'

'

'

'Discounted cash flows

'

'

'

'

Significant Unobservable Input

'

'

'

'

'

'

'

'

'

'

'

'

'Property specific valuation adjustment

'

'

'

'

'

'

'

'Equivalent rating

'

'

'

'

'

'

'

'

'Discount rate

'

'

'

'

'

'

'

'

'

'Discount rate

'Constant prepayment rate (CPR)

Level 3 Fair Value Measurements Range of Inputs

'

'

'

'

'

'

'

'

'

'

'

'

'(100)%-81%

'

'

'

'

'

'

'

'BBB-AA+

'

'

'

'

'

'

'

'

'1.27%-2.20%

'

'

'

'

'

'

'

'

'

'9.5%-13%

'10%-15%

Weighted Average of Inputs

'

'

'

'

'

'

'

'

'

'

'

'

-1.19%

-1.19%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1.76%

'

'

'

'

'

'

'

'

'

9.66%

12.04%

Impact to valuation from an increased or higher input value

'

'

'

'

'

'

'

'

'

'

'

'

'Increase

'

'

'

'

'

'

'

'Increase

'

'

'

'

'

'

'

'

'Decrease

'

'

'

'

'

'

'

'

'

'Decrease

'Decrease

Fair Value Inputs, Discount Rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1.27%

'

2.20%

'

9.50%

13.00%

'

'

Fair Value Inputs, Prepayment Rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

10.00%

15.00%

'

'

Fair Value Inputs, Property Specific Valuation Adjustment

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-100.00%

'

81.00%

'

'

'

'

'

'

Recovered_Sheet6

Fair Value Of Assets And Liabilities (Summary Of Carrying Amounts And Estimated Fair Values Of Financial Instruments) (Detail) (USD $)	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'	'	'
Interest bearing deposits with banks	$620,370	'	$495,574	$681,834	'	'
Available-for-sale securities, at fair value	1,782,648	'	2,176,290	1,781,883	'	'
Trading account securities	6,015	'	497	259	'	'
Federal Home Loan Bank and Federal Reserve Bank stock, at cost	80,951	'	79,261	76,755	'	'
Brokerage customer receivables	26,624	'	30,953	29,253	'	'
Derivative assets	27,858	'	29,130	35,583	'	'
FDIC indemnification asset	27,359	46,115	85,672	100,313	137,681	208,160
Federal Home Loan Bank advances	347,500	'	417,762	387,852	'	'
Other borrowings	51,483	'	255,104	248,416	'	'
Subordinated notes	140,000	'	0	10,000	'	'
Junior subordinated debentures	249,493	'	249,493	249,493	'	'
Derivative liabilities	31,451	'	34,807	38,804	'	'
Carrying Value [Member]	'	'	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'	'	'
Cash and cash equivalents	287,416	'	263,864	330,637	'	'
Interest bearing deposits with banks	620,370	'	495,574	681,834	'	'
Available-for-sale securities, at fair value	1,782,648	'	2,176,290	1,781,883	'	'
Trading account securities	6,015	'	497	259	'	'
Federal Home Loan Bank and Federal Reserve Bank stock, at cost	80,951	'	79,261	76,755	'	'
Brokerage customer receivables	26,624	'	30,953	29,253	'	'
Mortgage loans held-for-sale, at fair value	363,303	'	332,485	329,186	'	'
Mortgage loans held-for-sale, at lower of cost or market	0	'	1,842	5,159	'	'
Total loans	14,306,664	'	13,243,033	12,997,027	'	'
Servicing Asset at Fair Value, Amount	8,137	'	8,946	8,608	'	'
Nonqualified deferred compensation assets	7,927	'	7,222	6,801	'	'
Derivative assets	43,343	'	48,221	57,573	'	'
FDIC indemnification asset	27,359	'	85,672	100,313	'	'
Accrued interest receivable and other	170,517	'	163,732	165,209	'	'
Total financial assets	17,731,274	'	16,937,592	16,570,497	'	'
Non-maturity deposits	11,761,825	'	10,442,077	10,386,493	'	'
Deposits with stated maturities	4,303,421	'	4,226,712	4,260,953	'	'
Federal Home Loan Bank advances	347,500	'	417,762	387,852	'	'
Other borrowings	51,483	'	255,104	248,416	'	'
Subordinated notes	140,000	'	0	10,000	'	'
Junior subordinated debentures	249,493	'	249,493	249,493	'	'
Derivative liabilities	35,505	'	37,264	49,300	'	'
Accrued interest payable	8,995	'	8,556	7,758	'	'
Total financial liabilities	16,898,222	'	15,636,968	15,600,265	'	'
Fair Value [Member]	'	'	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'	'	'
Cash and cash equivalents	287,416	'	263,864	330,637	'	'
Interest bearing deposits with banks	620,370	'	495,574	681,834	'	'
Available-for-sale securities, at fair value	1,782,648	'	2,176,290	1,781,883	'	'
Trading account securities	6,015	'	497	259	'	'
Federal Home Loan Bank and Federal Reserve Bank stock, at cost	80,951	'	79,261	76,755	'	'
Brokerage customer receivables	26,624	'	30,953	29,253	'	'
Mortgage loans held-for-sale, at fair value	363,303	'	332,485	329,186	'	'
Mortgage loans held-for-sale, at lower of cost or market	0	'	1,857	5,218	'	'
Total loans	15,001,394	'	13,867,255	13,576,959	'	'
Servicing Asset at Fair Value, Amount	8,137	'	8,946	8,608	'	'
Nonqualified deferred compensation assets	7,927	'	7,222	6,801	'	'
Derivative assets	43,343	'	48,221	57,573	'	'
FDIC indemnification asset	27,359	'	85,672	100,313	'	'
Accrued interest receivable and other	170,517	'	163,732	165,209	'	'
Total financial assets	18,426,004	'	17,561,829	17,150,488	'	'
Non-maturity deposits	11,761,825	'	10,442,077	10,386,493	'	'
Deposits with stated maturities	4,303,717	'	4,242,172	4,272,459	'	'
Federal Home Loan Bank advances	352,516	'	422,750	393,602	'	'
Other borrowings	51,483	'	255,104	248,416	'	'
Subordinated notes	142,720	'	0	10,000	'	'
Junior subordinated debentures	250,452	'	250,672	250,751	'	'
Derivative liabilities	35,505	'	37,264	49,300	'	'
Accrued interest payable	8,995	'	8,556	7,758	'	'
Total financial liabilities	$16,907,213	'	$15,658,595	$15,618,779	'	'

Fair_Values_Of_Assets_And_Liab3

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

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Jun. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Municipal Bonds [Member]

Municipal Bonds [Member]

Municipal Bonds [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, 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]

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]

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]

Municipal Bonds [Member]

Municipal Bonds [Member]

Municipal Bonds [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, 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, 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]

Other Real Estate Owned [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [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]

Equity Securities [Member]

Fair Value, Measurements, Nonrecurring [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]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Available-for-sale Securities

$1,782,648,000

$2,176,290,000

$1,781,883,000

$187,103,000

$152,716,000

$150,647,000

$52,155,000

$51,528,000

$49,271,000

'

'

'

$187,103,000

$152,716,000

$150,647,000

$52,155,000

$51,528,000

$49,271,000

'

'

'

'

$50,237,000

$36,386,000

$32,688,000

$23,961,000

$22,163,000

$20,442,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair Value Inputs, Discount Rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1.27%

2.20%

1.76%

'

'

'

'

'

'

'

'

'

9.50%

13.00%

9.66%

Servicing Asset at Fair Value, Amount

'

'

'

'

'

'

'

'

'

8,137,000

8,946,000

8,608,000

'

'

'

'

'

'

'

8,137,000

8,946,000

8,608,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair Value Inputs, Prepayment Rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

10.00%

15.00%

12.04%

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

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

340,000,000

314,900,000

310,300,000

'

'

'

'

Mortgage loans held-for-sale

'

'

'

'

'

'

'

'

'

363,303,000

332,485,000

329,186,000

'

'

'

'

'

'

'

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Mortgages held for sale, past due 90 days and accruing

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total impaired loans

129,537,000

[1]

162,229,000

[1]

176,298,000

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

69,300,000

'

'

'

Impaired Loans Fair Value Disclosure

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

60,209,000

'

'

'

'

'

'

'

'

'

'

'

'

60,209,000

'

'

'

'

'

'

'

'

'

'

'

Other real estate owned

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$98,945,000

'

'

'

'

'

'

'

'

'

'

'

'

$98,945,000

'

'

'

'

'

'

'

'

'

'

'

Fair Value Inputs, Property Specific Valuation Adjustment

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-100.00%

81.00%

'

'

'

'

'

'

'

Level Three Fair Value Measurements Weighted Average Percentage

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1.76%

'

'

'

'

'

'

-1.19%

-1.19%

'

'

'

'

'

'

'

'

'

[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)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Share-based Compensation [Abstract]	'	'
Expected dividend yield	0.40%	0.50%
Expected volatility	30.80%	59.10%
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 $)	9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014		Sep. 30, 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	366,478		235,002
Common Shares, Exercised	-139,928		-78,184
Common Shares, Forfeited or canceled	-99,147		-45,818
Common Shares, Outstanding at end of the period	1,652,075		1,856,427
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	$46.85		$37.97
Weighted Average Strike Price, Exercised	$33.90		$28.50
Weighted Average Strike Price, Forfeited or canceled	$50.61		$45.18
Weighted Average Strike Price, Outstanding at end of period	$43.24		$42.27
Stock Options, Exercisable	1,050,665		1,845,560
Stock Options, Weighted Average Strike Price, Exercisable	$43.86		$42.32
Stock Options, Remaining Contractual Term, Outstanding, Years	'3 years 4 months 24 days	[1]	'2 years 4 months 24 days	[1]
Stock Options, Remaining Contractual Term, Exercisable, Years	'2 years 1 month 6 days	[1]	'2 years 4 months 24 days	[1]
Stock Options, Intrinsic Value, Outstanding	$8,133	[2]	$6,786	[2]
Stock Options, Intrinsic Value, Exercisable	$5,851	[2]	$6,710	[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 $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 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	12,313	10,617	'	'
Shares, Vested and issued	-51,978	-135,767	'	'
Shares, Forfeited	-6,752	-1,236	'	'
Shares, Outstanding, End of the Period	135,105	187,840	'	'
Shares, Vested, but not issuable	85,000	85,000	'	'
Weighted Average Grant-Date Fair Value	$47.09	$42.51	$43.39	$37.99
Weighted Average Grant-Date Fair Value, Granted	$46.04	$40.86	'	'
Weighted Average Grant-Date Fair Value, Vested and issued	$35.12	$31.97	'	'
Weighted Average Grant-Date Fair Value, Forfeited	$37.95	$35.02	'	'
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	93,535	105,825	'	'
Shares, Vested and issued	-15,944	0	'	'
Shares, Forfeited	-89,424	-7,641	'	'
Shares, Outstanding, End of the Period	295,679	312,749	'	'
Weighted Average Grant-Date Fair Value	$38.18	$33.99	$34.01	$32.08
Weighted Average Grant-Date Fair Value, Granted	$46.85	$37.87	'	'
Weighted Average Grant-Date Fair Value, Vested and issued	$33.25	$0	'	'
Weighted Average Grant-Date Fair Value, Forfeited	$33.78	$34.05	'	'

StockBased_Compensation_Plans_4

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

3 Months Ended

9 Months Ended

9 Months Ended

3 Months Ended

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

31-May-11

31-May-09

Jan. 31, 2007

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Mar. 31, 2014

Mar. 31, 2014

Rate

Two Thousand And Seven Plan [Member]

Two Thousand And Seven Plan [Member]

Two Thousand And Seven Plan [Member]

Two Thousand And Seven Plan [Member]

Two Thousand And Seven Plan [Member]

Two Thousand And Seven Plan [Member]

Nineteen Ninety Seven Plan [Member]

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]

Maximum [Member]

Minimum [Member]

Maximum [Member]

Minimum [Member]

Maximum [Member]

Rate

Rate

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

'

'

'

'

447,565

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

'

'

'

Allocated Share-based Compensation Expense

$2,200,000

$2,000,000

$8,100,000

$6,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

$17.49

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Aggregate intrinsic value of options exercised

'

'

$1,800,000

$777,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage Of Performance Based Award Payouts

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.00%

200.00%

'

'

Percentage Of Awards Paid In Performance Shares

'

'

17.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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	'
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		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Activity Accumulated Other Comprehensive Income [Roll Forward]	'	'	'	'
Balance at beginning of period	($34,503)	($49,204)	($63,036)	$7,711
Other comprehensive income (loss) during the period, net of tax, before reclassifications	-8,621	1,927	19,078	-56,716
Amount reclassified from accumulated other comprehensive income (loss), net of tax	424	863	1,258	2,591
Net other comprehensive income (loss) during the period, net of tax	-8,197	2,790	20,336	-54,125
Balance at end of period	-42,700	-46,414	-42,700	-46,414
Accumulated Unrealized (Losses) Gains on Securities	'	'	'	'
Activity Accumulated Other Comprehensive Income [Roll Forward]	'	'	'	'
Balance at beginning of period	-24,003	-41,213	-53,665	6,710
Other comprehensive income (loss) during the period, net of tax, before reclassifications	812	-1,460	30,251	-49,231
Amount reclassified from accumulated other comprehensive income (loss), net of tax	91	-45	314	-197
Net other comprehensive income (loss) during the period, net of tax	903	-1,505	30,565	-49,428
Balance at end of period	-23,100	-42,718	-23,100	-42,718
Accumulated Unrealized Losses on Derivative Instruments	'	'	'	'
Activity Accumulated Other Comprehensive Income [Roll Forward]	'	'	'	'
Balance at beginning of period	-2,898	-3,100	-2,462	-5,292
Other comprehensive income (loss) during the period, net of tax, before reclassifications	252	-518	-795	-206
Amount reclassified from accumulated other comprehensive income (loss), net of tax	333	908	944	2,788
Net other comprehensive income (loss) during the period, net of tax	585	390	149	2,582
Balance at end of period	-2,313	-2,710	-2,313	-2,710
Accumulated Foreign Currency Translation Adjustment	'	'	'	'
Activity Accumulated Other Comprehensive Income [Roll Forward]	'	'	'	'
Balance at beginning of period	-7,602	-4,891	-6,909	6,293
Other comprehensive income (loss) during the period, net of tax, before reclassifications	-9,685	3,905	-10,378	-7,279
Amount reclassified from accumulated other comprehensive income (loss), net of tax	0	0	0	0
Net other comprehensive income (loss) during the period, net of tax	-9,685	3,905	-10,378	-7,279
Balance at end of period	($17,287)	($986)	($17,287)	($986)

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		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]	'	'	'	'
(Losses) gains on available-for-sale securities, net	($153)	$75	($522)	$328
Interest on junior subordinated debentures	2,091	3,183	6,137	9,444
Income before taxes	65,258	58,082	184,629	166,618
Income tax expense	-25,034	-22,519	-71,364	-64,696
Net income	40,224	35,563	113,265	101,922
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	-153	75	-522	328
Income before taxes	-153	75	-522	328
Income tax expense	62	-30	208	-131
Net income	-91	45	-314	197
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	553	1,507	1,567	4,629
Income before taxes	-553	-1,507	-1,567	-4,629
Income tax expense	220	599	623	1,841
Net income	($333)	($908)	($944)	($2,788)

Recovered_Sheet9

Shareholders' Equity And Earnings Per Share (Computation Of Basic And Diluted Earnings Per Common Share) (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract]	'	'	'	'
Net income	$40,224	$35,563	$113,265	$101,922
Less: Preferred stock dividends and discount accretion	1,581	1,581	4,743	6,814
Net income applicable to common shares - Basic	38,643	33,982	108,522	95,108
Add: Dividends on convertible preferred stock, if dilutive	1,581	1,581	4,743	6,744
Net income applicable to common shares - Diluted	$40,224	$35,563	$113,265	$101,852
Weighted average common shares outstanding	46,639	39,331	46,453	37,939
Effect of dilutive potential common shares	'	'	'	'
Common stock equivalents	1,166	7,346	1,274	7,263
Convertible preferred stock, if dilutive	3,075	3,477	3,075	4,500
Total dilutive potential common shares	4,241	10,823	4,349	11,763
Weighted average common shares and effect of dilutive potential common shares	50,880	50,154	50,802	49,702
Net income per common share-Basic	$0.83	$0.86	$2.34	$2.51
Net income per common share-Diluted	$0.79	$0.71	$2.23	$2.05

Shareholders_Equity_And_Earnin3

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

1 Months Ended

3 Months Ended

9 Months Ended

12 Months Ended

1 Months Ended

3 Months Ended

12 Months Ended

0 Months Ended

3 Months Ended

1 Months Ended

0 Months Ended

12 Months Ended

0 Months Ended

12 Months Ended

Aug. 31, 2014

Jul. 31, 2014

31-May-14

Apr. 30, 2014

Feb. 28, 2014

Jan. 31, 2014

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2010

Dec. 31, 2013

Jul. 19, 2013

Dec. 07, 2010

Jul. 19, 2013

Aug. 31, 2008

Mar. 31, 2012

Mar. 31, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

Dec. 31, 2010

Dec. 15, 2013

1-May-13

Dec. 19, 2008

Sep. 30, 2014

Jun. 30, 2014

Feb. 28, 2013

Feb. 28, 2013

Mar. 31, 2012

Sep. 30, 2014

Dec. 15, 2013

Dec. 31, 2010

Dec. 31, 2010

Dec. 31, 2010

Mar. 15, 2011

Dec. 31, 2010

Dec. 07, 2010

Series A Preferred Stock [Member]

Series A Preferred Stock [Member]

Series C Preferred Stock [Member]

Series C Preferred Stock [Member]

Series C Preferred Stock [Member]

Series C Preferred Stock [Member]

Series C Preferred Stock [Member]

Junior Subordinated Amortizing Notes [Member]

Junior Subordinated Amortizing Notes [Member]

Junior Subordinated Amortizing Notes [Member]

First Lansing Bancorp, Inc. [Member]

US Treasury [Member]

US Treasury [Member]

US Treasury [Member]

Other Warrants [Member]

Other Warrants [Member]

Other Warrants [Member]

Other Warrants [Member]

Equity Component

Equity Component

Equity Component

Equity Component

Debt Component

Debt Component

Debt Component

Minimum [Member]

Maximum [Member]

Junior Subordinated Amortizing Notes [Member]

Junior Subordinated Amortizing Notes [Member]

Junior Subordinated Amortizing Notes [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

'

Percentage of fair value of debt component quarterly cash payments

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

7.50%

'

Discount rate on debt component

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

9.50%

Risk-free rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.95%

'

'

'

'

'

Expected stock price volatility minimum

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

35.00%

45.00%

'

'

'

Percent of dividend yield plus stock borrow cost

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.85%

'

'

'

'

'

Equity term, years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'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

126,500

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Preferred stock, liquidation value per share

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$1,000

$1,000

'

$1,000

$1,000

$1,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Preferred stock, value

'

'

'

'

'

'

$126,467,000

$126,500,000

$126,467,000

$126,500,000

'

$126,477,000

'

'

'

$50,000,000

$126,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Preferred Stock, Dividend Payment Terms

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'quarterly

'quarterly

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Preferred stock, dividend rate, percentage

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

8.00%

5.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Convertible Preferred Stock, Terms of Conversion

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'38.88

'24.3132

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Preferred Stock, Shares Converted

'

'

'

'

'

'

'

'

'

'

'

'

'

'

50,000

'

'

10

23

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock Issued During Period, Shares, Conversion of Convertible Securities

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,944,000

'

'

244

558

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock, no par value

'

'

'

'

'

'

'

'

'

'

'

'

$0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Warrants outstanding

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,643,295

1,042,373

'

'

'

19,000

0

'

'

'

'

'

'

'

Investment Warrants, Exercise Price

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$22.82

'

'

'

$30.50

'

'

'

'

'

'

'

'

'

Warrant Termination Period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'10 years

'

'

'

'

'

'

'

'

'

'

'

'

'

Warrants Exercised

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

100,993

499,929

1,000

'

18,000

'

'

'

'

'

'

'

'

Common Stock, Shares, Issued from Exercise of Warrant Shares

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

51,065

259,071

'

'

'

'

'

'

'

'

'

'

'

Common stock, shares issued

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

648,286

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Cash dividends declared per common share

'

$0.10

'

$0.10

'

$0.10

$0.10

$0.09

$0.30

$0.18

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common Stock Dividends Per Share Declared Annualized

'

$0.40

'

$0.40

'

$0.40

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Dividends Payable, Date to be Paid

21-Aug-14

'

22-May-14

'

20-Feb-14

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Dividends Payable, Date of Record

7-Aug-14

'

8-May-14

'

6-Feb-14

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Subsequent_Events_Detail

Subsequent Events (Detail) (USD $)	9 Months Ended		0 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Oct. 27, 2014	Oct. 14, 2014	Oct. 14, 2014	Oct. 14, 2014
	Line of Credit [Member]	Line of Credit [Member]	Line of Credit [Member]	Delavan Bancshares [Member]	Delavan Bancshares [Member]	Southeastern Wisconsin [Member]
			Subsequent Event [Member]	Subsequent Event [Member]	Subsequent Event [Member]	Delavan Bancshares [Member]
						Subsequent Event [Member]
						locations
Subsequent Event [Line Items]	'	'	'	'	'	'
Business Acquisition, Date of Acquisition Agreement	'	'	'	14-Oct-14	'	'
Number of locations	'	'	'	'	'	4
Business Combination, Acquired Receivables, Fair Value	'	'	'	'	$142	'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits	'	'	'	'	$167	'
Maturity Date	6-Nov-14	25-Oct-13	15-Dec-14	'	'	'