MB Financial 10-Q 6 May 14 2014 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2014	6-May-14
Entity Registrant Name	'MB FINANCIAL INC /MD	'
Entity Central Index Key	'0001139812	'
Document Type	'10-Q	'
Document Period End Date	31-Mar-14	'
Amendment Flag	'false	'
Current Fiscal Year End Date	'--12-31	'
Entity Current Reporting Status	'Yes	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	55,136,899
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q1	'

CONSOLIDATED_BALANCE_SHEETS

CONSOLIDATED BALANCE SHEETS (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
ASSETS	'	'
Cash and due from banks	$268,803	$205,193
Interest earning deposits with banks	244,819	268,266
Total cash and cash equivalents	513,622	473,459
Federal funds sold	7,500	42,950
Investment securities:	'	'
Securities available for sale, at fair value	1,082,050	1,118,912
Securities held to maturity, at amortized cost ($1.2 billion fair value at March 31, 2014 and December 31, 2013)	1,188,692	1,182,533
Non-marketable securities - FHLB and FRB stock	51,432	51,417
Total investment securities	2,322,174	2,352,862
Loans held for sale	802	629
Loans:	'	'
Total loans, excluding covered loans	5,394,638	5,476,831
Covered loans	173,677	235,720
Total loans	5,568,315	5,712,551
Less: Allowance for loan losses	106,752	111,746
Net loans	5,461,563	5,600,805
Lease investment, net	122,589	131,089
Premises and equipment, net	221,711	221,065
Cash surrender value of life insurance	131,008	130,181
Goodwill	423,369	423,369
Other intangibles	22,188	23,428
Other real estate owned, net	20,928	23,289
Other real estate owned related to FDIC-assisted transactions	22,682	20,472
FDIC indemnification asset	8,055	11,675
Other assets	159,112	186,154
Total assets	9,437,303	9,641,427
Deposits:	'	'
Noninterest bearing	2,435,868	2,375,863
Interest bearing	5,049,879	5,005,396
Total	7,485,747	7,381,259
Short-term borrowings	189,872	493,389
Long-term borrowings	65,664	62,159
Junior subordinated notes issued to capital trusts	152,065	152,065
Accrued expenses and other liabilities	200,175	225,873
Total liabilities	8,093,523	8,314,745
STOCKHOLDERS’ EQUITY	'	'
Common stock, ($0.01 par value; authorized 70,000,000 shares at March 31, 2014 and December 31, 2013; issued 55,338,248 shares at March 31, 2014 and 55,148,409 shares at December 31, 2013)	553	551
Additional paid-in capital	740,245	738,053
Retained earnings	595,301	581,998
Accumulated other comprehensive income	10,362	8,383
Less: 199,346 and 184,173 shares of treasury stock, at cost, at March 31, 2014 and December 31, 2013, respectively	-4,132	-3,747
Controlling interest stockholders’ equity	1,342,329	1,325,238
Noncontrolling interest	1,451	1,444
Total stockholders’ equity	1,343,780	1,326,682
Total liabilities and stockholders’ equity	$9,437,303	$9,641,427

CONSOLIDATED_BALANCE_SHEETS_Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Securities held to maturity, at amortized cost, fair value (in dollars)	$1,223,471	$1,198,929
Common stock, par value (in dollars per share)	$0.01	$0.01
Common stock, authorized shares	70,000,000	70,000,000
Common stock, issued shares	55,338,248	55,148,409
Treasury stock, shares	199,346	184,173

CONSOLIDATED_STATEMENTS_OF_OPE

CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Interest income:	'	'
Loans	$56,244	$60,793
Investment securities:	'	'
Taxable	8,146	6,140
Nontaxable	8,067	8,060
Federal funds sold	5	0
Other interest earning accounts	113	135
Total interest income	72,575	75,128
Interest expense:	'	'
Deposits	3,769	5,709
Short-term borrowings	100	167
Long-term borrowings and junior subordinated notes	1,378	1,567
Total interest expense	5,247	7,443
Net interest income	67,328	67,685
Provision for credit losses	1,150	0
Net interest income after provision for credit losses	66,178	67,685
Non-interest income:	'	'
Capital markets and international banking fees	978	808
Commercial deposit and treasury management fees	7,144	5,966
Lease financing, net	13,196	16,263
Trust and asset management fees	5,207	4,494
Card fees	2,701	2,695
Loan service fees	965	1,011
Consumer and other deposit service fees	2,935	3,246
Brokerage fees	1,325	1,157
Net gain (loss) on investment securities	317	-1
Increase in cash surrender value of life insurance	827	844
Net gain on sale of assets	7	0
Accretion of FDIC indemnification asset	31	143
Net gain on sale of loans	59	639
Other operating income	920	1,438
Total non-interest income	36,612	38,703
Non-interest expenses:	'	'
Salaries and employee benefits	44,377	43,514
Occupancy and equipment expense	9,592	9,404
Computer services and telecommunication expense	5,084	3,887
Advertising and marketing expense	2,081	2,103
Professional and legal expense	1,779	1,295
Other intangibles amortization expense	1,240	1,544
Net loss recognized on other real estate owned	187	330
Other real estate expense, net	396	139
Other operating expenses	11,311	9,213
Total non-interest expenses	76,047	71,429
Income before income taxes	26,743	34,959
Income tax expense	6,774	10,053
Net income	$19,969	$24,906
Common share data:	'	'
Basic earnings per common share	$0.37	$0.46
Diluted earnings per common share	$0.36	$0.46
Weighted average common shares outstanding for basic earnings per common share	54,639,951	54,411,806
Diluted weighted average common shares outstanding for diluted earnings per common share	55,265,188	54,736,644

CONSOLIDATED_STATEMENTS_OF_COM

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Net income	$19,969	$24,906
Unrealized holding gain (loss) on investment securities, net of reclassification adjustments	4,946	-2,304
Reclassification adjustment for amortization of unrealized gains on investment securities transferred to held to maturity from available for sale	-1,376	0
Reclassification adjustments for (gains) losses included in net income	-317	1
Other comprehensive income (loss), before tax	3,253	-2,303
Income tax (expense) benefit related to items of other comprehensive income (loss)	-1,274	905
Other comprehensive income (loss), net of tax	1,979	-1,398
Comprehensive income	$21,948	$23,508

CONSOLIDATED_STATEMENTS_OF_CHA

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (USD $)	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss), Net of Tax	Treasury Stock	Noncontrolling Interest
In Thousands, unless otherwise specified
Balance at Dec. 31, 2012	$1,275,770	$550	$732,771	$507,933	$36,326	($3,293)	$1,483
Increase (Decrease) in Stockholders' Equity	'	'	'	'	'	'	'
Net income	24,944	'	'	24,906	'	'	38
Other comprehensive income (loss), net of tax	-1,398	'	'	'	-1,398	'	'
Cash dividends declared on common stock	-5,507	'	'	-5,507	'	'	'
Restricted common stock activity, net of tax	14	'	14	'	'	'	'
Stock option activity, net of tax	-99	'	-99	'	'	'	'
Repurchase of common shares in connection with employee benefit plans and held in trust for deferred compensation plan	-125	'	111	'	'	-236	'
Stock-based compensation expense	1,260	'	1,260	'	'	'	'
Distributions to noncontrolling interest	-56	'	'	'	'	'	-56
Balance at Mar. 31, 2013	1,294,803	550	734,057	527,332	34,928	-3,529	1,465
Balance at Dec. 31, 2013	1,326,682	551	738,053	581,998	8,383	-3,747	1,444
Increase (Decrease) in Stockholders' Equity	'	'	'	'	'	'	'
Net income	20,039	'	'	19,969	'	'	70
Other comprehensive income (loss), net of tax	1,979	'	'	'	1,979	'	'
Cash dividends declared on common stock	-6,666	'	'	-6,666	'	'	'
Restricted common stock activity, net of tax	104	2	102	'	'	'	'
Stock option activity, net of tax	27	'	27	'	'	'	'
Repurchase of common shares in connection with employee benefit plans and held in trust for deferred compensation plan	-334	'	51	'	'	-385	'
Stock-based compensation expense	2,012	'	2,012	'	'	'	'
Distributions to noncontrolling interest	-63	'	'	'	'	'	-63
Balance at Mar. 31, 2014	$1,343,780	$553	$740,245	$595,301	$10,362	($4,132)	$1,451

CONSOLIDATED_STATEMENTS_OF_CHA1

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash dividends declared	$0.12	$0.10

CONSOLIDATED_STATEMENTS_OF_CAS

CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Cash Flows From Operating Activities	'	'
Net income (loss)	$19,969	$24,906
Adjustments to reconcile net income to net cash provided by (used in) operating activities:	'	'
Depreciation of premises and equipment	4,503	4,191
Depreciation of leased equipment	9,150	8,474
Compensation expense for restricted stock awards	1,648	994
Compensation expense for stock option grants	364	266
Gain on sales of premises and equipment and leased equipment	-630	-412
Amortization of other intangibles	1,240	1,544
Provision for credit losses	1,150	0
Deferred income tax expense	-1,406	-5,109
Amortization of premiums and discounts on investment securities, net	11,110	12,517
Accretion of premiums and discounts on loans, net	-550	-1,507
Accretion of FDIC indemnification asset	-31	-143
Net (gain) loss on sale of investment securities available for sale	-317	1
Proceeds from sale of loans held for sale	3,247	31,097
Origination of loans held for sale	-3,342	-25,972
Net gain on sale of loans held for sale	-59	-639
Net gain on sales of other real estate owned	18	30
Fair value adjustments on other real estate owned	140	349
Net loss on sales of other real estate owned related to FDIC-assisted transactions	65	11
Increase in cash surrender value of life insurance	-827	-844
Decrease in other assets, net	23,713	12,720
Decrease in other liabilities, net	-36,590	-64,112
Net cash provided by (used in) operating activities	32,529	-1,698
Cash Flows From Investing Activities	'	'
Decrease in federal funds sold	35,450	0
Proceeds from sales of investment securities available for sale	11,375	635
Proceeds from maturities and calls of investment securities available for sale	61,989	160,430
Purchases of investment securities available for sale	-37,670	-118,412
Proceeds from maturities and calls of investment securities held to maturity	11,736	363
Purchases of investment securities held to maturity	-12,836	-21,340
Purchases of non-marketable securities - FHLB and FRB stock	-15	0
Redemption of non-marketable securities - FHLB and FRB stock	0	2,951
Net decrease in loans	134,795	62,955
Purchases of premises and equipment	-1,849	-2,483
Purchases of leased equipment	-3,723	-3,628
Proceeds from sales of leased equipment	4,219	1,803
Proceeds from sale of other real estate owned	2,778	5,907
Proceeds from sale of other real estate owned related to FDIC-assisted transactions	631	2,613
Principal paid on lease investments	0	-497
Net proceeds from FDIC related covered assets	3,032	7,487
Net cash provided by investing activities	209,912	98,784
Cash Flows From Financing Activities	'	'
Net increase (decrease) in deposits	104,488	-90,791
Net (decrease) increase in short-term borrowings	-303,517	3,777
Proceeds from long-term borrowings	6,117	1,747
Principal paid on long-term borrowings	-2,612	-53,778
Treasury stock transactions, net	-334	-125
Stock options exercised	61	30
Excess tax expense (benefits) from share-based payment arrangements	95	-12
Dividends paid on common stock	-6,576	-5,446
Net cash used in financing activities	-202,278	-144,598
Net increase (decrease) in cash and cash equivalents	40,163	-47,512
Cash and cash equivalents:	'	'
Beginning of period	473,459	287,543
End of period	513,622	240,031
Cash payments for:	'	'
Interest paid to depositors and other borrowed funds	5,275	7,673
Net income tax payments, net	1,967	17,620
Supplemental Schedule of Noncash Investing Activities:	'	'
Investment securities held to maturity purchased not settled	9,941	0
Loans transferred to other real estate owned	539	711
Loans transferred to other real estate owned related to FDIC-assisted transactions	3,419	872
Loans transferred to repossessed vehicles	205	168
Operating leases rewritten as direct finance leases included as loans	$316	$6,339

Basis_of_Presentation_Notes

Basis of Presentation (Notes)	3 Months Ended
	Mar. 31, 2014
Accounting Policies [Abstract]	'
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	'
	Basis of Presentation
	These unaudited consolidated financial statements include the accounts of MB Financial, Inc., a Maryland corporation (the “Company”), and its subsidiaries, including its wholly owned national bank subsidiary, MB Financial Bank, N.A. (“MB Financial Bank”), based in Chicago, Illinois. In the opinion of management, all normal recurring adjustments necessary for a fair presentation of the financial position, results of operations and cash flows for the interim periods have been made. The results of operations for the three months ended March 31, 2014 are not necessarily indicative of the results to be expected for the entire fiscal year.
	These unaudited interim financial statements have been prepared in conformity with U.S. generally accepted accounting principles (“GAAP”) and industry practice. Certain information in footnote disclosure normally included in financial statements prepared in accordance with U.S. GAAP and industry practice has been condensed or omitted pursuant to rules and regulations of the Securities and Exchange Commission. These financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Company’s December 31, 2013 audited financial statements filed on Form 10-K.
	The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions which affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements, as well as the reported amounts of income and expenses during the reported periods. Actual results could differ from those estimates.
	Certain prior period amounts have been reclassified to conform to current period presentation. These reclassifications did not result in any changes to previously reported net income or stockholders’ equity.

New_Authoritative_Accounting_G

New Authoritative Accounting Guidance (Notes)	3 Months Ended
	Mar. 31, 2014
New Authoritative Accounting Guidance [Abstract]	'
New Authoritative Accounting Guidance	'
	New Authoritative Accounting Guidance
	ASC Topic 740 “Income Taxes.” New authoritative accounting guidance under ASC Topic 740, “Income Taxes” amended prior guidance to include explicit guidance on the financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. An unrecognized tax benefit, or a portion of an unrecognized tax benefit, should be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward, except as follows. To the extent a net operating loss carryforward, a similar tax loss, or a tax credit carryforward is not available at the reporting date under the tax law of the applicable jurisdiction to settle any additional income taxes that would result from the disallowance of a tax position or the tax law of the applicable jurisdiction does not require the entity to use, and the entity does not intend to use, the deferred tax asset for such purpose, the unrecognized tax benefit should be presented in the financial statements as a liability and should not be combined with deferred tax assets. The Company adopted this new authoritative guidance on January 1, 2014, and it did not have an impact on the Company's statements of operations or financial condition.
	ASC Topic 310 “Receivables.” New authoritative accounting guidance under ASC Topic 310, “Receivables” amended prior guidance to clarify that an in substance repossession or foreclosure occurs, and a creditor is considered to have received physical
	possession of residential real estate property collateralizing a consumer mortgage loan, upon either (1) the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure or (2) the borrower conveying all interest in the residential real estate property to the creditor to satisfy that loan through completion of a deed in lieu of foreclosure or through a similar legal agreement. Additionally, the amendments require interim and annual disclosures. The new authoritative guidance will be for reporting periods after January 1, 2015 and is not expected to have an impact on the Company's statements of operations or financial condition.
	ASC Topic 323 “Investments - Equity Method and Joint Ventures.” New authoritative accounting guidance under ASC Topic 323, “Investments - Equity Method and Joint Ventures” amended prior guidance to permit entities to make an accounting policy election to account for their investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met. Under the proportional amortization method, an entity amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received and recognizes the net investment performance in the statement of operation as a component of income tax expense. The new authoritative guidance will be for reporting periods after January 1, 2015 and is not expected to have an impact on the Company's statements of operations or financial condition.

Earnings_Per_Common_Share

Earnings Per Common Share	3 Months Ended
	Mar. 31, 2014
Accounting Policies [Abstract]	'
Earnings Per Common Share	'
	Earnings Per Common Share
	Earnings per common share is computed using the two-class method. Basic earnings per common share is computed by dividing net income available to common stockholders by the weighted-average number of common shares outstanding during the applicable period, excluding outstanding participating securities. Participating securities include non-vested restricted stock awards and restricted stock units, though no actual shares of common stock related to restricted stock units are issued until the settlement of such units, to the extent holders of these securities receive non-forfeitable dividends or dividend equivalents at the same rate as holders of the Company's common stock. Diluted earnings per common share is computed using the weighted-average number of shares determined for the basic earnings per common share computation plus the dilutive effect of stock compensation using the treasury stock method.
	The following table presents a reconciliation of the number of shares used in the calculation of basic and diluted earnings per common share (amounts in thousands, except share and per share data).
		Three Months Ended
		March 31,
		2014		2013
	Distributed earnings allocated to common stock	$	6,666	$	5,507
	Undistributed earnings	13,303		19,399
	Net income	19,969		24,906
	Less: earnings allocated to participating securities	—		1
	Earnings allocated to common stockholders	$	19,969	$	24,905
	Weighted average shares outstanding for basic earnings per common share	54,639,951		54,411,806
	Dilutive effect of equity awards	625,237		324,838
	Weighted average shares outstanding for diluted earnings per common share	55,265,188		54,736,644
	Basic earnings per common share	$	0.37	$	0.46
	Diluted earnings per common share	0.36		0.46

Business_Combinations

Business Combinations	3 Months Ended
	Mar. 31, 2014
Business Combinations [Abstract]	'
Business Combinations	'
	Business Combinations
	On July 14, 2013, the Company and Taylor Capital Group, Inc. (“Taylor Capital”) entered into an Agreement and Plan of Merger (the "Merger Agreement") whereby the Company will acquire Taylor Capital. The Merger Agreement provides that, upon the terms and subject to the conditions set forth therein, Taylor Capital will merge with and into the Company, with the Company as the surviving corporation in the merger. Immediately following the Merger, Taylor Capital's wholly owned subsidiary bank, Cole Taylor Bank, will merge with the Company's wholly owned subsidiary bank, MB Financial Bank. Cole Taylor Bank is a commercial bank headquartered in Chicago with $5.6 billion in assets, $3.7 billion in loans and $4.0 billion in deposits as of March 31, 2014.
	Subject to the terms and conditions of the Merger Agreement, at the effective time of the Merger (the "Effective Time"), each share of Taylor Capital common stock and each share of Taylor Capital nonvoting convertible preferred stock ("non-voting preferred stock") will be converted into the right to receive, promptly following the Effective Time, (1) 0.64318 of a share of the Company's common stock and (2) $4.08 in cash. All "in-the-money" Taylor Capital stock options and warrants outstanding immediately prior to the Effective Time will be canceled in exchange for a cash payment as provided in the Merger Agreement, as will all then-outstanding unvested restricted stock awards of Taylor Capital; however, the cash consideration paid for such restricted stock awards will remain subject to vesting or other lapse restrictions. Each share of Taylor Capital's Perpetual Non-Cumulative Preferred Stock, Series A, will be exchanged for a share of a series of preferred stock of the Company with substantially identical terms.
	The Merger Agreement was approved by the stockholders of each of MB Financial and Taylor Capital on February 26, 2014. The Merger remains subject to regulatory approvals and other customary closing conditions. As disclosed in Taylor Capital’s Annual Report on Form 10-K for the year ended December 31, 2013, Taylor Capital has been notified by its regulators that its Cole Taylor Bank subsidiary may be cited with a violation of Section 5 of the Federal Trade Commission Act.  The potential violation relates to the account opening process associated with a former deposit program relationship with an organization that provides electronic financial disbursements and payment services to the higher education industry.  Cole Taylor Bank exited the relationship in August 2013. As the regulatory approval process for the Merger continues, an evaluation of this situation is being conducted by Taylor Capital’s regulators. That evaluation is ongoing and the closing of the Merger could be delayed beyond June 30, 2014.

Investment_Securities

Investment Securities	3 Months Ended
	Mar. 31, 2014
Investments Securities [Abstract]	'
Investment Securities	'
	Investment Securities
	Carrying amounts and fair values of investment securities were as follows (in thousands):
		Amortized			Gross			Gross			Fair
		Cost			Unrealized			Unrealized			Value
					Gains			Losses
	31-Mar-14
	Available for Sale
	U.S. Government sponsored agencies and enterprises	$	50,291		$	1,555		$	(10	)	$	51,836
	States and political subdivisions	19,285			206			(141		)	19,350
	Residential mortgage-backed securities	666,707			8,268			(1,460		)	673,515
	Commercial mortgage-backed securities	50,841			2,083			—			52,924
	Corporate bonds	272,490			2,947			(1,584		)	273,853
	Equity securities	10,703			—			(131		)	10,572
	Total Available for Sale	1,070,317			15,059			(3,326		)	1,082,050
	Held to Maturity
	States and political subdivisions	940,610			22,486			(1,466		)	961,630
	Residential mortgage-backed securities	248,082			13,759			—			261,841
	Total Held to Maturity	1,188,692			36,245			(1,466		)	1,223,471
	Total	$	2,259,009		$	51,304		$	(4,792	)	$	2,305,521
	December 31, 2013
	Available for Sale
	U.S. Government sponsored agencies and enterprises	$	50,486		$	1,704		$	(122	)	$	52,068
	States and political subdivisions	19,398			22			(277		)	19,143
	Residential mortgage-backed securities	696,415			8,555			(3,737		)	701,233
	Commercial mortgage-backed securities	50,891			2,050			—			52,941
	Corporate bonds	284,083			1,597			(2,610		)	283,070
	Equity securities	10,649			—			(192		)	10,457
	Total Available for Sale	1,111,922			13,928			(6,938		)	1,118,912
	Held to Maturity
	States and political subdivisions	932,955			7,584			(4,366		)	936,173
	Residential mortgage-backed securities	249,578			13,178			—			262,756
	Total Held to Maturity	1,182,533			20,762			(4,366		)	1,198,929
	Total	$	2,294,455		$	34,690		$	(11,304	)	$	2,317,841
	We do not have any meaningful direct or indirect holdings of subprime residential mortgage loans, home equity lines of credit, or any Fannie Mae or Freddie Mac preferred or common equity securities in our investment portfolio.
	The Company has no direct exposure to the State of Illinois, but approximately 29% of the state and political subdivisions portfolio consists of securities issued by municipalities located in Illinois as of March 31, 2014. Approximately 90% of such securities were general obligation issues as of March 31, 2014.
	Unrealized losses on investment securities and the fair value of the related securities at March 31, 2014 were as follows (in thousands):
		Less Than 12 Months						12 Months or More						Total
		Fair			Unrealized			Fair			Unrealized			Fair		Unrealized
		Value			Losses			Value			Losses			Value		Losses
	Available for Sale
	U.S. Government sponsored agencies and enterprises	$	18,660		$	(10	)	$	—		$	—		$	18,660	$	(10	)
	States and political subdivisions	849			(2		)	4,645			(139		)	5,494		(141		)
	Residential mortgage-backed securities	155,458			(1,047		)	23,387			(413		)	178,845		(1,460		)
	Corporate bonds	41,294			(408		)	10,350			(1,176		)	51,644		(1,584		)
	Equity securities	10,572			(131		)	—			—			10,572		(131		)
	Total Available for Sale	226,833			(1,598		)	38,382			(1,728		)	265,215		(3,326		)
	Held to Maturity
	States and political subdivisions	64,610			(1,366		)	4,399			(100		)	69,009		(1,466		)
	Total	$	291,443		$	(2,964	)	$	42,781		$	(1,828	)	$	334,224	$	(4,792	)
	Unrealized losses on investment securities and the fair value of the related securities at December 31, 2013 were as follows (in thousands):
		Less Than 12 Months						12 Months or More						Total
		Fair			Unrealized			Fair			Unrealized			Fair		Unrealized
		Value			Losses			Value			Losses			Value		Losses
	Available for Sale
	U.S. Government sponsored agencies and enterprises	$	18,598		$	(122	)	$	—		$	—		$	18,598	$	(122	)
	States and political subdivisions	2,275			(166		)	4,748			(111		)	7,023		(277		)
	Residential mortgage-backed securities	232,807			(2,905		)	44,182			(832		)	276,989		(3,737		)
	Corporate bonds	122,344			(2,606		)	705			(4		)	123,049		(2,610		)
	Equity securities	10,457			(192		)	—			—			10,457		(192		)
	Total Available for Sale	386,481			(5,991		)	49,635			(947		)	436,116		(6,938		)
	Held to Maturity
	States and political subdivisions	235,016			(4,330		)	1,301			(36		)	236,317		(4,366		)
	Total	$	621,497		$	(10,321	)	$	50,936		$	(983	)	$	672,433	$	(11,304	)
The total number of security positions in the investment portfolio in an unrealized loss position at March 31, 2014 was 151 compared to 345 at December 31, 2013. Declines in the fair value of available for sale securities below their cost that are deemed to be other than temporary are reflected in earnings as realized losses to the extent the impairment is related to credit losses. The amount of the impairment related to other factors is recognized in other comprehensive income. In estimating other-than-temporary impairment losses, management considers, among other things, (i) the length of time and the extent to which the fair value has been less than cost, (ii) the financial condition and near-term prospects of the issuer, and (iii) whether or not the Company is more likely than not to sell the security before recovery of its cost basis.
As of March 31, 2014, management does not have the intent to sell any of the securities in the table above and believes that it is more likely than not that the Company will not have to sell any such securities before a recovery of cost. The fair value is expected to recover as the bonds approach their maturity date or repricing date or if market yields for such investments decline. Accordingly, as of March 31, 2014, management believes the impairments detailed in the table above are temporary.
Changes in market interest rates can significantly influence the fair value of securities, and the fair value of our municipal security portfolio would decline substantially if interest rates increase materially.
Net gains (losses) recognized on investment securities available for sale were as follows (in thousands):
	Three Months Ended
	March 31,
	2014			2013
Realized gains	$	318		$	—
Realized losses	(1		)	(1		)
Net gains (losses)	$	317		$	(1	)
The amortized cost and fair value of investment securities as of March 31, 2014 by contractual maturity are shown below. Maturities may differ from contractual maturities in mortgage-backed securities because the mortgages underlying the securities may be called or repaid without any penalties. Therefore, mortgage-backed securities are not included in the maturity categories in the following maturity summary.
	Amortized			Fair
(In thousands)	Cost			Value
Available for sale:
Due in one year or less	$	503		$	503
Due after one year through five years	325,427			328,517
Due after five years through ten years	7,657			7,735
Due after ten years	8,479			8,284
Equity securities	10,703			10,572
Residential and commercial mortgage-backed securities	717,548			726,439
	1,070,317			1,082,050
Held to maturity:
Due in one year or less	26,530			26,552
Due after one year through five years	255,068			256,567
Due after five years through ten years	113,465			115,502
Due after ten years	545,547			563,009
Residential mortgage-backed securities	248,082			261,841
	1,188,692			1,223,471
Total	$	2,259,009		$	2,305,521
Investment securities available for sale with carrying amounts of $918.5 million and $908.4 million at March 31, 2014 and December 31, 2013, respectively, were pledged as collateral on public deposits and for other purposes as required or permitted by law. Of those pledged, the Company had investment securities available for sale pledged as collateral for advances from the Federal Home Loan Bank of $23.6 million and $29.0 million at March 31, 2014 and December 31, 2013, respectively.

Loans

Loans	3 Months Ended
	Mar. 31, 2014
Receivables [Abstract]	'
Loans	'
	Loans
	Loans consist of the following at (in thousands):
			March 31, 2014				December 31, 2013
	Commercial loans		$	1,267,398			$	1,281,377
	Commercial loans collateralized by assignment of lease payments		1,472,621				1,494,188
	Commercial real estate		1,623,509				1,647,700
	Residential real estate		309,137				314,440
	Construction real estate		132,997				141,253
	Indirect vehicle		266,044				262,632
	Home equity		258,120				268,289
	Other consumer loans		64,812				66,952
	Gross loans, excluding covered loans		5,394,638				5,476,831
	Covered loans		173,677				235,720
	Total loans (1)		$	5,568,315			$	5,712,551
	(1)          Gross loan balances at March 31, 2014 and December 31, 2013 are net of unearned income, including net deferred loan fees of $1.5 million and $1.9 million, respectively.
	Loans are made to individuals as well as commercial and tax exempt entities. Specific loan terms vary as to interest rate, repayment, and collateral requirements based on the type of loan requested and the credit worthiness of the prospective borrower. Except for commercial loans collateralized by assignment of lease payments, credit risk tends to be geographically concentrated in that a majority of the loan customers are located in the markets serviced by MB Financial Bank.
	The Company's extension of credit is governed by its Credit Risk Policy which was established to control the quality of the Company's loans. These policies and procedures are reviewed and approved by the Board of Directors on a regular basis.
	Commercial Loans. Commercial credit is extended primarily to middle market customers. Such credits are typically comprised of working capital loans, loans for physical asset expansion, asset acquisition loans and other business loans. Loans to closely held businesses will generally be guaranteed in full or for a significant amount by the businesses' principal owners. Commercial loans are made based primarily on the historical and projected cash flow of the borrower and secondarily on the underlying collateral provided by the borrower. The cash flows of borrowers, however, may not behave as forecasted and collateral securing loans may fluctuate in value due to economic or individual performance factors. Minimum standards and underwriting guidelines have been established for all commercial loan types.
	Commercial Loans Collateralized by Assignment of Lease Payments ("Lease Loans"). The Company makes lease loans to both investment grade and non-investment grade companies. Investment grade lessees are companies rated in one of the four highest categories by Moody's Investor Services or Standard & Poor's Rating Services or, in the event the related lessee has not received any such rating, where the related lessee would be viewed under the underwriting polices of the Company as an investment grade company. Whether or not companies fall into this category, each lease loan is considered on its individual merit based on financial information available at the time of underwriting.
	Commercial Real Estate Loans. Commercial real estate loans are subject to underwriting standards and processes similar to commercial loans. These loans are viewed primarily as cash flow loans and the repayment of these loans is largely dependent on the successful operation of the property. Loan performance may be adversely affected by factors impacting the general economy or conditions specific to the real estate market such as geographic location and/or property type.
	Construction Real Estate Loans. The Company defines construction loans as loans where the loan proceeds are controlled by the Company and used exclusively for the improvement of real estate in which the Company holds a mortgage. Due to the inherent risk in this type of loan, they are subject to other industry specific policy guidelines outlined in the Company's Credit Risk Policy.
	Consumer Related Loans. The Company originates direct and indirect consumer loans, including primarily residential real estate, home equity lines and loans, credit cards, and indirect vehicle loans (motorcycle, powersports, recreational and marine vehicles), using a matrix-based credit analysis as part of the underwriting process. Each loan type has a separate matrix which consists of several factors including debt to income, type of collateral and loan to collateral value, credit history and Company relationship with the borrower. Indirect loan and credit card underwriting involves the use of risk-based pricing in the underwriting process.
	A collateral pledge agreement exists whereby at all times, the Company must keep on hand, free of all other pledges, liens, and encumbrances, first mortgage loans and home equity loans with unpaid principal balances aggregating no less than 133% for first mortgage loans and 250% for home equity loans of the outstanding advances from the Federal Home Loan Bank.  As of March 31, 2014 and December 31, 2013, the Company had $7.3 million and $518.4 million, respectively, of loans pledged as collateral for long-term Federal Home Loan Bank advances.
	The following table presents the contractual aging of the recorded investment in past due loans by class of loans as of March 31, 2014 and December 31, 2013 (in thousands):
			Current				30-59 Days				60-89 Days				Loans Past Due			Total			Total
							Past Due				Past Due				90 Days or More			Past Due
	31-Mar-14
	Commercial		$	1,259,251			$	5,202			$	310			$	2,635		$	8,147		$	1,267,398
	Commercial collateralized by assignment of lease payments		1,466,054				5,848				14				705			6,567			1,472,621
	Commercial real estate
	Healthcare		213,723				—				—				—			—			213,723
	Industrial		366,168				146				2,820				3,250			6,216			372,384
	Multifamily		295,737				154				659				2,597			3,410			299,147
	Retail		345,090				—				—				7,720			7,720			352,810
	Office		147,312				—				1,604				1,975			3,579			150,891
	Other		231,022				575				1,323				1,634			3,532			234,554
	Residential real estate		298,478				887				1,660				8,112			10,659			309,137
	Construction real estate		130,322				—				—				2,675			2,675			132,997
	Indirect vehicle		263,885				1,622				350				187			2,159			266,044
	Home equity		247,218				2,641				371				7,890			10,902			258,120
	Other consumer		64,789				11				8				4			23			64,812
	Gross loans, excluding covered loans		5,329,049				17,086				9,119				39,384			65,589			5,394,638
	Covered loans		80,708				1,790				3,275				87,904			92,969			173,677
	Total loans (1)		$	5,409,757			$	18,876			$	12,394			$	127,288		$	158,558		$	5,568,315
	Nonperforming loan aging		$	72,372			$	6,831			$	6,427			$	33,140		$	46,398		$	118,770
	Non-covered loans related to FDIC transactions (2)		$	13,715			$	270			$	535			$	6,244		$	7,049		$	20,764
	December 31, 2013
	Commercial		$	1,273,302			$	5,952			$	626			$	1,497		$	8,075		$	1,281,377
	Commercial collateralized by assignment of lease payments		1,489,391				3,841				656				300			4,797			1,494,188
	Commercial real estate
	Healthcare		213,665				—				—				3,064			3,064			216,729
	Industrial		372,975				5,465				—				1,404			6,869			379,844
	Multifamily		302,456				3,078				181				2,226			5,485			307,941
	Retail		334,198				328				2,816				7,258			10,402			344,600
	Office		155,936				—				—				2,066			2,066			158,002
	Other		233,464				4,898				259				1,963			7,120			240,584
	Residential real estate		302,362				1,422				1,030				9,626			12,078			314,440
	Construction real estate		138,563				391				—				2,299			2,690			141,253
	Indirect vehicle		259,488				2,210				657				277			3,144			262,632
	Home equity		257,219				1,725				2,165				7,180			11,070			268,289
	Other consumer		66,866				81				1				4			86			66,952
	Gross loans, excluding covered loans		5,399,885				29,391				8,391				39,164			76,946			5,476,831
	Covered loans		135,717				902				3,346				95,755			100,003			235,720
Total loans (1)		$	5,535,602			$	30,293			$	11,737			$	134,919		$	176,949		$	5,712,551
Nonperforming loan aging		$	56,339			$	14,325			$	3,283			$	32,614		$	50,222		$	106,561
Non-covered loans related to FDIC transactions (2)		$	13,541			$	163			$	391			$	6,550		$	7,104		$	20,645
(1)          Includes loans related to the InBank FDIC-assisted transaction completed by MB Financial Bank in 2009.
(2)          Loans related to the InBank FDIC-assisted transaction completed by MB Financial Bank in 2009.
The following table presents the recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing by class of loans as of March 31, 2014 and December 31, 2013 (in thousands):
		March 31, 2014								December 31, 2013
						Loans past due								Loans past due
		Nonaccrual				90 days or more				Nonaccrual				90 days or more
						and still accruing								and still accruing
Commercial		$	38,407			$	—			$	17,781			$	—
Commercial collateralized by assignment of lease payments		3,420				705				4,276				291
Commercial real estate:
Healthcare		—				—				3,064				—
Industrial		14,419				—				15,265				155
Multifamily		7,674				—				5,145				—
Office		7,245				—				11,703				—
Retail		4,457				—				2,969				—
Other		15,704				42				19,991				—
Residential real estate		11,945				—				13,009				—
Construction real estate		782				—				475				—
Indirect vehicle		1,484				—				1,459				—
Home equity		12,476				—				10,969				—
Other consumer		10				—				9				—
Total		$	118,023			$	747			$	106,115			$	446
The Company utilizes an internal asset classification system as a means of reporting problem and potential problem loans. Under the Company's risk rating system, the Company classifies potential problem and problem loans as “Special Mention,” “Substandard,” and “Doubtful.” Substandard loans include those characterized by the distinct possibility that the Company will sustain some loss if the deficiencies are not corrected. Loans classified as Doubtful have all the weaknesses inherent in those classified as Substandard with the added characteristic that the weaknesses present make collection or liquidation in full, on the basis of currently existing facts, conditions and values, highly questionable and improbable. Loans that do not currently expose the Company to sufficient risk to warrant classification in one of the aforementioned categories but possess weaknesses that deserve management's close attention are deemed to be Special Mention. Risk ratings are updated at least annually and any time the situation warrants.
Loans listed as not rated are included in groups of homogeneous loans with similar risk and loss characteristics. The following tables present the risk category of loans by class of loans based on the most recent analysis performed as of March 31, 2014 and December 31, 2013 (in thousands):
		Pass				Special				Substandard				Doubtful			Total
						Mention
31-Mar-14
Commercial		$	1,172,539			$	35,654			$	59,205			$	—		$	1,267,398
Commercial collateralized by assignment of lease payments		1,465,808				233				6,580				—			1,472,621
Commercial real estate
Healthcare		189,935				9,148				14,640				—			213,723
Industrial		327,309				17,428				27,647				—			372,384
Multifamily		289,110				338				9,699				—			299,147
Retail		334,014				3,364				15,432				—			352,810
Office		140,437				2,631				7,823				—			150,891
Other		215,287				182				19,085				—			234,554
Construction real estate		129,882				2,333				782				—			132,997
Total		$	4,264,321			$	71,311			$	160,893			$	—		$	4,496,525
December 31, 2013
Commercial		$	1,193,114			$	26,637			$	61,000			$	626		$	1,281,377
Commercial collateralized by assignment of lease payments		1,486,899				553				6,736				—			1,494,188
Commercial real estate
Healthcare		189,705				21,186				2,774				3,064			216,729
Industrial		345,236				5,328				29,280				—			379,844
Multifamily		296,179				342				11,420				—			307,941
Retail		316,420				10,660				17,520				—			344,600
Office		151,393				2,682				3,927				—			158,002
Other		217,188				349				23,047				—			240,584
Construction real estate		139,847				540				866				—			141,253
Total		$	4,335,981			$	68,277			$	156,570			$	3,690		$	4,564,518
Approximately $92.1 million and $80.7 million of the substandard and doubtful loans were non-performing as of March 31, 2014 and December 31, 2013, respectively.
For residential real estate, home equity, indirect vehicle and other consumer loan classes, the Company also evaluates credit quality based on the aging status of the loan, which was previously presented, and by payment activity. The following table presents the recorded investment in those loan classes based on payment activity as of March 31, 2014 and December 31, 2013 (in thousands):
		Performing				Non-performing				Total
31-Mar-14
Residential real estate		$	297,192			$	11,945			$	309,137
Indirect vehicle		264,560				1,484				266,044
Home equity		245,644				12,476				258,120
Other consumer		64,802				10				64,812
Total		$	872,198			$	25,915			$	898,113
December 31, 2013
Residential real estate		$	301,431			$	13,009			$	314,440
Indirect vehicle		261,173				1,459				262,632
Home equity		257,320				10,969				268,289
Other consumer		66,943				9				66,952
Total		$	886,867			$	25,446			$	912,313
The following tables present loans individually evaluated for impairment by class of loans as of March 31, 2014 and December 31, 2013 (in thousands):
		31-Mar-14
																	Three Months Ended
		Unpaid				Recorded				Partial				Allowance for			Average			Interest
		Principal				Investment				Charge-offs				Loan Losses			Recorded			Income
		Balance												Allocated			Investment			Recognized
With no related allowance recorded:
Commercial		$	9,508			$	9,508			$	—			$	—		$	9,928		$	—
Commercial collateralized by assignment of lease payments		3,009				3,009				—				—			3,044			21
Commercial real estate:
Healthcare		—				—				—				—			—			—
Industrial		12,457				9,430				3,027				—			11,565			—
Multifamily		1,849				1,849				—				—			1,085			31
Retail		7,036				5,065				1,971				—			6,955			—
Office		735				527				208				—			768			—
Other		2,116				2,075				41				—			2,202			—
Residential real estate		4,151				4,151				—				—			4,145			—
Construction real estate		375				375				—				—			137			—
Indirect vehicle		—				—				—				—			—			—
Home equity		1,327				1,105				222				—			1,327			—
Other consumer		—				—				—				—			—			—
With an allowance recorded:
Commercial		31,683				31,683				—				6,160			13,679			—
Commercial collateralized by assignment of lease payments		1,226				1,226				—				174			919			22
Commercial real estate:
Healthcare		—				—				—				—			—			—
Industrial		7,461				7,159				302				318			4,565			—
Multifamily		7,765				6,519				1,246				1,748			6,307			70
Retail		9,086				7,345				1,741				556			7,259			—
Office		4,294				3,930				364				1,260			3,246			—
Other		14,146				14,061				85				269			14,290			4
Residential real estate		15,028				14,000				1,028				3,076			14,645			—
Construction real estate		2,796				407				2,389				195			527			—
Indirect vehicle		269				183				86				25			300			—
Home equity		24,244				23,705				539				1,395			24,538			—
Other consumer		—				—				—				—			—			—
Total		$	160,561			$	147,312			$	13,249			$	15,176		$	131,431		$	148
		December 31, 2013
		Unpaid				Recorded				Partial				Allowance for			Average			Interest
		Principal				Investment				Charge-offs				Loan Losses			Recorded			Income
		Balance												Allocated			Investment			Recognized
With no related allowance recorded:
Commercial		$	8,903			$	8,903			$	—			$	—		$	8,259		$	—
Commercial collateralized by assignment of lease payments		3,401				3,401				—				—			1,030			6
Commercial real estate:
Healthcare		—				—				—				—			2,698			—
Industrial		7,560				7,560				—				—			8,900			—
Multifamily		1,166				1,166				—				—			758			11
Retail		4,466				4,466				—				—			3,628			—
Office		559				527				32				—			922			—
Other		2,963				2,963				—				—			4,380			—
Residential real estate		4,234				4,234				—				—			3,260			—
Construction real estate		—				—				—				—			—			—
Indirect vehicle		—				—				—				—			—			—
Home equity		577				577				—				—			797			—
Other consumer		—				—				—				—			—			—
With an allowance recorded:
Commercial		8,923				8,919				4				4,284			13,476			4
Commercial collateralized by assignment of lease payments		1,060				1,060				—				144			1,279			192
Commercial real estate:
Healthcare		3,186				3,064				122				382			8,189			—
Industrial		7,707				7,705				2				3,038			3,699			—
Multifamily		5,374				5,374				—				1,661			6,443			340
Retail		14,169				12,428				1,741				1,511			12,885			280
Office		2,442				2,442				—				791			4,045			—
Other		20,367				17,029				3,338				796			12,868			20
Residential real estate		13,496				12,710				786				3,119			12,966			245
Construction real estate		475				475				—				227			1,603			—
Indirect vehicle		173				123				50				57			86			—
Home equity		23,840				23,395				445				1,358			24,283			772
Other consumer		—				—				—				—			—			—
Total		$	135,041			$	128,521			$	6,520			$	17,368		$	136,454		$	1,870
Impaired loans included accruing restructured loans of $25.8 million and $29.4 million that have been modified and are performing in accordance with those modified terms as of March 31, 2014 and December 31, 2013, respectively.  In addition, impaired loans included $15.6 million and $25.0 million of non-performing, restructured loans as of March 31, 2014 and December 31, 2013, respectively.
Loans may be restructured in an effort to maximize collections from financially distressed borrowers. We use various restructuring techniques, including, but not limited to, deferring past due interest or principal, implementing an A/B note structure, redeeming past due taxes, reducing interest rates, extending maturities and modifying amortization schedules. Residential real estate loans are restructured in an effort to minimize losses while allowing borrowers to remain in their primary residences when possible. Programs that we offer to residential real estate borrowers include the Home Affordable Refinance Program (“HARP”), a restructuring program similar to the Home Affordable Modification Program (“HAMP”) for first mortgage borrowers, the Second Lien Modification Program (“2MP”) and similar programs for home equity borrowers in keeping with the restructuring techniques discussed above.
Periodically, the Company will restructure a note into two separate notes (A/B structure), charging off the entire B portion of the note. The A note is structured with appropriate loan-to-value and cash flow coverage ratios that provide for a high likelihood of repayment. The A note is classified as a non-performing note until the borrower has displayed a historical payment performance for a reasonable time prior to and subsequent to the restructuring. A period of sustained repayment for at least six months generally is required to return the note to accrual status provided that management has determined that the performance is reasonably expected to continue. The A note will be classified as a restructured note (either performing or nonperforming) through the calendar year of the restructuring that the historical payment performance has been established. As of March 31, 2014 and December 31, 2013, there was approximately $1.1 million in recorded investment in relation to one A/B structure.
A loan classified as a troubled debt restructuring will no longer be included in the troubled debt restructuring disclosures in the years after the restructuring if the loan performs in accordance with the terms specified by the restructuring agreement and the interest rate specified in the restructuring agreement represents a market rate at the time of modification. The specified interest rate is considered a market rate when the interest rate is equal to or greater than the rate the Company is willing to accept at the time of restructuring for a new loan with comparable risk. If there are concerns that the borrower will not be able to meet the modified terms of the loan, the loan will continue to be included in the troubled debt restructuring disclosures.
Impairment analyses on commercial-related loans classified as troubled debt restructurings are performed in conjunction with the normal allowance for loan loss process. Consumer loans classified as troubled debt restructurings are aggregated in two pools that share common risk characteristics, home equity and residential real estate loans, with impairment measured on a quarterly basis based on the present value of expected future cash flows discounted at the loan's effective interest rate.
The following table presents loans that have been restructured during the three months ended March 31, 2014 (dollars in thousands):
		31-Mar-14
		Number of		Pre-Modification Recorded				Post-Modification Recorded				Charge-offs and
		Loans		Investment				Investment				Specific Reserves
Performing:
Indirect vehicle		1		$	5			$	5			$	—
Home equity		3		1,039				1,039				—
Total		4		$	1,044			$	1,044			$	—
Non-Performing:
Residential real estate		4		$	1,439			$	1,439			$	—
Indirect vehicle		18		108				108				—
Home equity		4		532				532				—
Total		26		$	2,079			$	2,079			$	—
The following table presents loans that have been restructured during the three months ended March 31, 2013 (dollars in thousands):
		31-Mar-13
		Number of			Pre-Modification Recorded				Post-Modification Recorded				Charge-offs and
		Loans			Investment				Investment				Specific Reserves
Performing:
Residential real estate		3			$	479			$	479			$	—
Home equity		5			548				548				—
Total		8			$	1,027			$	1,027			$	—
Non-Performing:
Commercial		1			$	42			$	42			$	13
Commercial real estate:
Multifamily		1			187				187				50
Retail		2			657				657				179
Other		1			84				84				23
Residential real estate		4			331				331				—
Home equity		16			2,105				2,105				—
Total		25			$	3,406			$	3,406			$	265
Of the troubled debt restructurings entered into during the past twelve months, none subsequently defaulted during the three months ended March 31, 2014.  Performing troubled debt restructurings are considered to have defaulted when they become 90 days or more past due post restructuring or are placed on non-accrual status.
The following tables present the troubled debt restructurings activity during the three months ended March 31, 2014 (in thousands):
		Performing				Non-performing
Beginning balance		$	29,430			$	24,952
Additions		1,044				2,079
Charge-offs		(162		)		(1,573		)
Principal payments, net		(319		)		(2,386		)
Removals		(8,573		)		(3,139		)
Transfer to other real estate owned		—				—
Transfer from/to performing		4,792				415
Transfer from/to nonperforming		(415		)		(4,792		)
Ending balance		$	25,797			$	15,556
Approximately $4.8 million of non-performing troubled debt restructurings were transferred to performing status. A majority of these loans were identified as non-performing troubled debt restructurings during the first half of 2013 and have performed in accordance with the modified terms. The loans continue to be reported as performing troubled debt restructurings. The loans transferred to nonperforming in the table above were restructured in 2011 and 2012. Loans removed from troubled debt restructuring status are those that were restructured in a previous calendar year at a market rate of interest and have performed in compliance with the modified terms.
The following table presents the type of modification for loans that have been restructured during the three months ended March 31, 2014 (in thousands):
	31-Mar-14
	Extended				Extended
	Maturity,				Maturity and				Delay in
	Amortization				Delay in Payments				Payments or
	and Reduction				or Reduction of				Reduction of
	of Interest Rate				Interest Rate				Interest Rate				Total
Residential real estate	$	—			$	1,269			$	170			$	1,439
Indirect vehicle	—				—				113				113
Home equity	68				1,209				294				1,571
Total	$	68			$	2,478			$	577			$	3,123
The following table presents the activity in the allowance for credit losses, balance in allowance for credit losses and recorded investment in loans by portfolio segment and based on impairment method as of March 31, 2014 and 2013 (in thousands):
		Commercial				Commercial				Commercial				Residential			Construction			Indirect		Home			Other consumer		Unfunded			Total
						collateralized  by				real estate				real estate			real estate			vehicle		equity					commitments
						assignment of
						lease payments
31-Mar-14
Allowance for credit losses:
Beginning balance		$	23,461			$	9,159			$	51,628			$	8,872		$	6,856		$	1,662	$	8,478		$	1,630	$	1,716		$	113,462
Charge-offs		90				—				7,156				265			56			920		619			495		—			9,601
Recoveries		1,628				—				485				519			99			442		133			78		—			3,384
Provision		(1,061		)		(101		)		2,583				(1,039		)	(415		)	500		405			351		(73		)	1,150
Ending balance		$	23,938			$	9,058			$	47,540			$	8,087		$	6,484		$	1,684	$	8,397		$	1,564	$	1,643		$	108,395
Ending allowance balance attributable to loans:
Individually evaluated for impairment		$	6,160			$	174			$	4,151			$	3,076		$	195		$	25	$	1,395		$	—	$	665		$	15,841
Collectively evaluated for impairment		17,312				8,884				41,707				5,011			6,229			1,659		7,002			1,564		978			90,346
Acquired and accounted for under ASC 310-30 (1)		466				—				1,682				—			60			—		—			—		—			2,208
Total ending allowance balance		$	23,938			$	9,058			$	47,540			$	8,087		$	6,484		$	1,684	$	8,397		$	1,564	$	1,643		$	108,395
Loans:
Individually evaluated for impairment		$	41,191			$	4,235			$	57,960			$	18,151		$	782		$	183	$	24,810		$	—	$	—		$	147,312
Collectively evaluated for impairment		1,208,639				1,468,386				1,565,549				287,790			132,215			265,861		233,310			64,812		—			5,226,562
Acquired and accounted for under ASC 310-30 (1)		30,976				—				95,506				5,121			36,752			—		110			25,976		—			194,441
Total ending loans balance		$	1,280,806			$	1,472,621			$	1,719,015			$	311,062		$	169,749		$	266,044	$	258,230		$	90,788	$	—		$	5,568,315
31-Mar-13
Allowance for credit losses:
Beginning balance		$	24,943			$	7,755			$	61,056			$	6,941		$	11,222		$	1,324	$	9,401		$	1,562	$	4,075		$	128,279
Charge-offs		911				—				1,917				962			82			729		787			565		—			5,953
Recoveries		452				144				740				214			276			415		114			52		—			2,407
Provision		(330		)		200				3,268				455			(2,246		)	389		(826		)	234		(1,144		)	—
Ending balance		$	24,154			$	8,099			$	63,147			$	6,648		$	9,170		$	1,399	$	7,902		$	1,283	$	2,931		$	124,733
Ending allowance balance attributable to loans:
Individually evaluated for impairment		$	2,643			$	86			$	8,912			$	2,858		$	496		$	—	$	682		$	—	$	2,461		$	18,138
Collectively evaluated for impairment		19,475				8,013				52,248				3,681			8,674			1,399		7,220			1,283		470			102,463
Acquired and accounted for under ASC 310-30 (1)		2,036				—				1,987				109			—			—		—			—		—			4,132
Total ending allowance balance		$	24,154			$	8,099			$	63,147			$	6,648		$	9,170		$	1,399	$	7,902		$	1,283	$	2,931		$	124,733
Loans:
Individually evaluated for impairment		$	21,134			$	536			$	59,435			$	14,791		$	2,160		$	—	$	25,058		$	—	$	—		$	123,114
Collectively evaluated for impairment		1,168,907				1,347,130				1,683,894				294,145			99,421			220,739		266,132			81,932		—			5,162,300
Acquired and accounted for under ASC 310-30 (1)		52,040				—				223,952				6,414			106,927			—		291			32,630		—			422,254
Total ending loans balance		$	1,242,081			$	1,347,666			$	1,967,281			$	315,350		$	208,508		$	220,739	$	291,481		$	114,562	$	—		$	5,707,668
(1)  Loans acquired in FDIC-assisted transactions and accounted for under ASC Subtopic 310-30 “Receivables — Loans and Debt Securities Acquired with Deteriorated Credit Quality.”
Purchased loans acquired in a business combination are recorded at estimated fair value on their purchase date without a carryover of the related allowance for loan losses. These acquired loans are segregated into three types: pass rated loans with no discount attributable to credit quality, non-impaired loans with a discount attributable at least in part to credit quality and impaired loans with evidence of significant credit deterioration.
•	Pass rated loans (typically performing loans) are accounted for in accordance with ASC 310-20 "Nonrefundable Fees and Other Costs" as these loans do not have evidence of credit deterioration since origination.
•	Non-impaired loans (typically past-due loans, special mention loans and performing substandard loans) are accounted for in accordance with ASC 310-30 if they display at least some level of credit deterioration since origination.
•	Impaired loans (typically substandard loans on non-accrual status) are accounted for in accordance with ASC 310-30 as they display significant credit deterioration since origination.
In accordance with ASC 310-30, for both purchased non-impaired loans and purchased impaired loans, the difference between contractually required payments at acquisition and the cash flows expected to be collected is referred to as the non-accretable difference. Further, any excess of cash flows expected at acquisition over the estimated fair value is referred to as the accretable yield and is recognized into interest income over the remaining life of the loan when there is a reasonable expectation about the amount and timing of such cash flows.
Substantially all of the loans acquired in transactions with the FDIC displayed at least some level of credit deterioration and as such are included as non-impaired and impaired loans as described immediately above.
During the three ended March 31, 2014 there was a provision for credit losses of $155 thousand and net charge-offs of $179 thousand, in relation to 16 pools of purchased loans with a total carrying amount of $146.1 million as of March 31, 2014. There was $2.2 million in allowance for loan losses related to these purchased loans at March 31, 2014 and December 31, 2013.  The provision for credit losses and accompanying charge-offs are included in the table above.
Changes in the accretable yield for loans acquired in FDIC-assisted transactions and accounted for under ASC 310-30 were as follows for the three months ended March 31, 2014 and 2013 (in thousands):
		Three Months Ended
		March 31,
		2014				2013
Balance at beginning of period		$	2,337			$	5,685
Accretion		(550		)		(1,457		)
Other		574				92
Balance at end of period		$	2,361			$	4,320
In our FDIC-assisted transactions, the fair value of purchased impaired loans, on the acquisition date, was determined based on assigned risk ratings, expected cash flows and the fair value of loan collateral. The fair value of loans that were non-impaired was determined based on estimates of losses on defaults and other market factors. Due to the loss-share agreements with the FDIC, MB Financial Bank recorded a receivable (FDIC indemnification asset) from the FDIC equal to the present value of the corresponding reimbursement percentages on the estimated losses embedded in the loan portfolio.
When cash flow estimates are adjusted downward for a particular loan pool, the FDIC indemnification asset is increased. An allowance for loan losses is established for the impairment of the loans. A provision for loan losses is recognized for the difference between the increase in the FDIC indemnification asset and the decrease in cash flows.
When cash flow estimates are adjusted upward for a particular loan pool, the FDIC indemnification asset is decreased. The difference between the decrease in the FDIC indemnification asset and the increase in cash flows is accreted over the estimated life of the loan pool.
When cash flow estimates are adjusted downward for covered foreclosed real estate, the FDIC indemnification asset is increased. A charge is recognized for the difference between the increase in the FDIC indemnification asset and the decrease in cash flows.
When cash flow estimates are adjusted upward for covered foreclosed real estate, the FDIC indemnification asset is decreased. Any write-down after the transfer to covered foreclosed real estate is reversed.
In both scenarios, the clawback liability (the amount the FDIC requires MB Financial Bank to pay back if certain thresholds are met) will increase or decrease accordingly.
The carrying amount of covered loans and other purchased non-covered loans at March 31, 2014 consisted of loans as shown in the following table (in thousands):
31-Mar-14		Purchased				Purchased Non-Impaired				Total
		Impaired				Loans
		Loans
Covered loans:
Commercial related (1)		$	5,660			$	5,670			$	11,330
Commercial		666				1,411				2,077
Commercial real estate		50,176				45,330				95,506
Construction real estate		31,030				5,723				36,753
Other		2,533				25,478				28,011
Total covered loans		$	90,065			$	83,612			$	173,677
Estimated (payable) receivable amount from the FDIC under the loss-share agreement (2)		$	(1,755	)		$	9,024			$	7,269
Non-covered loans:
Commercial related (3)		$	4,823			$	12,745			$	17,568
Other		89				3,107				3,196
Total non-covered loans		$	4,912			$	15,852			$	20,764
-1	Covered commercial related loans include commercial, commercial real estate and construction real estate loans acquired in connection with the Heritage and Benchmark FDIC-assisted transactions.
-2	Estimated reimbursable amounts from the FDIC under the loss-share agreement exclude $786 thousand in reimbursable amounts related to covered other real estate owned.
-3	Non-covered commercial related loans include commercial, commercial real estate and construction real estate for InBank.
Outstanding balances on purchased loans from the FDIC were $202.8 million and $268.5 million as of March 31, 2014 and December 31, 2013, respectively.  The related carrying amount on loans purchased from the FDIC was $194.4 million and $256.4 million as of March 31, 2014 and December 31, 2013, respectively.
Effective April 1, 2014, the losses on commercial related loans (commercial, commercial real estate and construction real estate) acquired in connection with the Heritage FDIC-assisted transaction will no longer be covered under the loss-share agreement for that transaction. The carrying amount of those loans was $3.8 million as of March 31, 2014. Any recoveries, net of expenses, received on commercial related loans on which losses were incurred prior to April 1, 2014 will continue to be covered (and any such net recoveries must be shared with the FDIC in accordance with the loss-share agreement) through March 31, 2017. The losses on consumer related loans acquired in connection with the Heritage FDIC-assisted transaction will continue to be covered under the loss-share agreement through March 31, 2019.

Goodwill_and_Intangibles

Goodwill and Intangibles	3 Months Ended
	Mar. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill and Intangibles	'
	Goodwill and Intangibles
	The excess of the cost of an acquisition over the fair value of the net assets acquired, including core deposit and client relationship intangibles, consists of goodwill. Under ASC Topic 350, goodwill is subject to at least annual assessments for impairment by applying a fair value based test. The Company reviews goodwill to determine potential impairment annually, or more frequently if events and circumstances indicate that goodwill might be impaired, by comparing the carrying value of the reporting units with the fair value of the reporting units.
	The Company's annual assessment date is as of December 31. Goodwill is tested for impairment at the reporting unit level. The Company has two reporting units: banking and leasing. No impairment losses were recognized during the three months ended March 31, 2014 or 2013.   The carrying amount of goodwill was $423.4 million at March 31, 2014 and December 31, 2013.
	The Company has other intangible assets consisting of core deposit and client relationship intangibles that had a remaining weighted average amortization period of approximately four years as of March 31, 2014.
	The following table presents the changes in the carrying amount of core deposit and client relationship intangibles, gross carrying amount, accumulated amortization, and net book value as of March 31, 2014 (in thousands):
		Three Months Ended
		March 31,
		2014
	Balance at beginning of period	$	23,428
	Amortization expense	(1,240		)
	Balance at end of period	$	22,188
	Gross carrying amount	$	54,368
	Accumulated amortization	(32,180		)
	Net book value	$	22,188
	The following presents the estimated future amortization expense of other intangible assets (in thousands):
	Year ending December 31,	Amount
	2014	$	3,508
	2015	4,030
	2016	3,418
	2017	3,071
	2018	2,812
	Thereafter	5,349
		$	22,188

Deposits

Deposits	3 Months Ended
	Mar. 31, 2014
Deposits [Abstract]	'
Deposits	'
	Deposits
	The composition of deposits was as follows (in thousands):
		March 31,		December 31,
		2014		2013
	Demand deposit accounts, noninterest bearing	$	2,435,868	$	2,375,863
	NOW and money market accounts	2,772,766		2,682,419
	Savings accounts	865,910		855,394
	Certificates of deposit, $100,000 or more	790,273		827,413
	Other certificates of deposit	620,930		640,170
	Total	$	7,485,747	$	7,381,259
	Certificates of deposit of $100,000 or more included $222.3 million and $224.2 million of brokered deposits at March 31, 2014 and December 31, 2013, respectively.  Brokered deposits typically consist of smaller individual time certificates that have the same liquidity characteristics and yields consistent with time certificates of $100,000 or more.

ShortTerm_Borrowings

Short-Term Borrowings	3 Months Ended
	Mar. 31, 2014
Short-term Debt [Abstract]	'
Short-Term Borrowings	'
	Short-Term Borrowings
	Short-term borrowings were as follows as of March 31, 2014 and December 31, 2013 (dollars in thousands):
		31-Mar-14				December 31, 2013
		Weighted				Weighted
		Average				Average
		Cost		Amount		Cost		Amount
	Customer repurchase agreements	0.2	%	$	189,872	0.2	%	$	193,389
	Federal Home Loan Bank advances	—		—		0.17		300,000
		0.2	%	$	189,872	0.18	%	$	493,389
	Securities sold under agreements to repurchase are agreements in which the Company acquires funds by selling assets to another party under a simultaneous agreement to repurchase the same assets at a specified price and date.  The Company enters into repurchase agreements and also offers a demand deposit account product to customers that sweeps their balances in excess of an agreed upon target amount into overnight repurchase agreements.  All securities sold under agreements to repurchase are recorded on the face of the balance sheet.
	The Company had a Federal Home Loan Bank fixed rate advance with a maturity date less than one year of $300.0 million at December 31, 2013 that matured early in the first quarter of 2014.  The Company has investment securities available for sale and loans pledged as collateral on this FHLB advance. See Note 4. Investment Securities and Note 5. Loans of the notes to the consolidated financial statements.
	On March 9, 2012, the Company entered into a $35.0 million unsecured line of credit with a correspondent bank. Interest is payable at a rate of one month LIBOR + 2.00%. As of March 31, 2014, no amount was outstanding. The line originally matured on March 8, 2013, was renewed and is scheduled to mature on June 7, 2014.

Longterm_Borrowings

Long-term Borrowings	3 Months Ended
	Mar. 31, 2014
Long-term Debt, Unclassified [Abstract]	'
Long-term Borrowings	'
	Long-term Borrowings
	The Company had Federal Home Loan Bank advances with remaining contractual maturities greater than one year of $4.3 million at March 31, 2014 and December 31, 2013. As of March 31, 2014, the advances had fixed terms with effective interest rates, net of discounts, ranging from 3.23% to 5.87% and maturities ranging from April 2021 to April 2035. The Company has investment securities available for sale and loans pledged as collateral on this FHLB advance. See Note 5. Investment Securities and Note 6. Loans of the notes to the consolidated financial statements.
	The Company had notes payable to banks totaling $21.1 million and $17.5 million at March 31, 2014 and December 31, 2013, respectively, which as of March 31, 2014, were accruing interest at rates ranging from 2.50% to 12.00%.  Lease investments includes equipment with an amortized cost of $25.6 million and $25.7 million at March 31, 2014 and December 31, 2013, respectively, that is pledged as collateral on these notes.
	The Company had a $40.0 million 10-year structured repurchase agreement as of March 31, 2014 and December 31, 2013, which bears interest at a fixed rate borrowing of 4.75% and expires in 2016.

Junior_Subordinated_Notes_Issu

Junior Subordinated Notes Issued to Capital Trusts	3 Months Ended
	Mar. 31, 2014
JUNIOR SUBORDINATED NOTES ISSUED TO CAPITAL TRUSTS	'
Junior Subordinated Notes Issued to Capital Trusts	'
	Junior Subordinated Notes Issued to Capital Trusts
	The Company has established statutory trusts for the sole purpose of issuing trust preferred securities and related trust common securities.  The proceeds from such issuances were used by the trusts to purchase junior subordinated notes of the Company, which are the sole assets of each trust.  Concurrently with the issuance of the trust preferred securities, the Company issued guarantees for the benefit of the holders of the trust preferred securities.  The Company’s outstanding trust preferred securities qualify, and are treated by the Company, as Tier 1 regulatory capital.  The Company owns all of the common securities of each trust.  The trust preferred securities issued by each trust rank equally with the common securities in right of payment, except that if an event of default under the indenture governing the notes has occurred and is continuing, the preferred securities will rank senior to the common securities in right of payment.
	The table below summarizes the outstanding junior subordinated notes and the related trust preferred securities issued by each trust as of March 31, 2014 (in thousands):
			Coal City		MB Financial		MB Financial		MB Financial
			Capital Trust I		Capital Trust II		Capital Trust III		Capital Trust IV
	Junior Subordinated Notes:
	Principal balance		$	25,774	$	36,083	$	10,310	$	20,619
	Annual interest rate		3-mo LIBOR + 1.80%		3-mo LIBOR + 1.40%		3-mo LIBOR + 1.50%		3-mo LIBOR + 1.52%
	Stated maturity date		September 1, 2028		September 15, 2035		September 23, 2036		September 15, 2036
	Call date		September 1, 2008		December 15, 2010		September 23, 2011		September 15, 2011
	Trust Preferred Securities:
	Face Value		$	25,000	$	35,000	$	10,000	$	20,000
	Annual distribution rate		3-mo LIBOR + 1.80%		3-mo LIBOR + 1.40%		3-mo LIBOR + 1.50%		3-mo LIBOR + 1.52%
	Issuance date		July 1998		August 2005		July 2006		August 2006
	Distribution dates (1)		Quarterly		Quarterly		Quarterly		Quarterly
			MB Financial		MB Financial		FOBB
			Capital Trust V		Capital Trust VI		Statutory Trust III (2)
	Junior Subordinated Notes:
	Principal balance		$	30,928	$	23,196	$	5,155
	Annual interest rate		3-mo LIBOR + 1.30%		3-mo LIBOR + 1.30%		3-mo LIBOR + 2.80%
	Stated maturity date		December 15, 2037		October 30, 2037		January 23, 2034
	Call date		December 15, 2012		October 30, 2012		January 23, 2009
	Trust Preferred Securities:
	Face Value		$	30,000	$	22,500	$	5,000
	Annual distribution rate		3-mo LIBOR + 1.30%		3-mo LIBOR + 1.30%		3-mo LIBOR + 2.80%
	Issuance date		September 2007		October 2007		December 2003
	Distribution dates (1)		Quarterly		Quarterly		Quarterly
	-1	All distributions are cumulative and paid in cash.
	-2	FOBB Statutory Trust III was established by First Oak Brook Bancshares, Inc. (“FOBB”) prior to the Company's acquisition of FOBB, and the junior subordinated note issued by FOBB to FOBB Statutory Trust III was assumed by the Company upon completion of the acquisition.
	The trust preferred securities are subject to mandatory redemption, in whole or in part, upon repayment of the junior subordinated notes at the stated maturity date or upon redemption of the junior subordinated notes.  Each trust’s ability to pay amounts due on the trust preferred securities is solely dependent upon the Company making payment on the related junior subordinated notes.  The Company’s obligation under the junior subordinated notes and other relevant trust agreements, in aggregate, constitutes a full and unconditional guarantee by the Company of each trust’s obligations under the trust preferred securities issued by each trust.  The Company has the right to defer payment of interest on the notes and, therefore, distributions on the trust preferred securities, for up to five years, but not beyond the stated maturity date in the table above.  During any such deferral period the Company may not pay cash dividends on its stock and generally may not repurchase its stock.

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	Commitments and Contingencies
	Commitments: The Company is a party to credit-related financial instruments with off-balance-sheet risk in the normal course of business to meet the financing needs of its customers.  These financial instruments include commitments to extend credit, standby letters of credit and commercial letters of credit.  Such commitments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount recognized in the consolidated balance sheets.
	The Company’s exposure to credit loss is represented by the contractual amount of these commitments.  The Company follows the same credit policies in making commitments as it does for on-balance-sheet instruments.
	At March 31, 2014 and December 31, 2013, the following financial instruments were outstanding, the contractual amounts of which represent off-balance sheet credit risk (in thousands):
		Contractual Amount
		March 31, 2014		December 31, 2013
	Commitments to extend credit:
	Home equity lines	$	206,193	$	208,581
	Other commitments	1,174,336		1,214,391
	Letters of credit:
	Standby	75,274		69,556
	Commercial	763		708
	Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract.  Commitments generally have fixed expiration dates or other termination clauses and may require a payment of a fee.  The commitments for home equity lines of credit may expire without being drawn upon.  Therefore, the total commitment amounts do not necessarily represent future cash requirements.  The amount of collateral obtained, if it is deemed necessary by the Company, is based on management’s credit evaluation of the customer.
	The Company, in the normal course of its business, regularly offers standby and commercial letters of credit to its bank customers.  Standby and commercial letters of credit are a conditional but irrevocable form of guarantee.  Under letters of credit, the Company typically guarantees payment to a third party beneficiary upon the default of payment or nonperformance by the bank customer and upon receipt of complying documentation from that beneficiary.
	Both standby and commercial letters of credit may be issued for any length of time, but normally do not exceed a period of five years.  These letters of credit may also be extended or amended from time to time depending on the bank customer’s needs.  As of March 31, 2014, the maximum remaining term for any standby letters of credit was December 31, 2021.  A fee is charged to the bank customer and is recognized as income over the life of the letter of credit, unless considered non-rebatable under the terms of a letter of credit application.
	At March 31, 2014, the aggregate contractual amount of these letters of credit, which represents the maximum potential amount of future payments that the Company would be obligated to pay, increased $5.8 million to $76.0 million from $70.3 million at December 31, 2013.  Of the $76.0 million in commitments outstanding at March 31, 2014, approximately $23.9 million of the letters of credit have been issued or renewed since December 31, 2013.
	Letters of credit issued on behalf of bank customers may be done on either a secured, partially secured or an unsecured basis.  If a letter of credit is secured or partially secured, the collateral can take various forms including bank accounts, investments, fixed assets, inventory, accounts receivable or real estate, among other things.  The Company takes the same care in making credit decisions and obtaining collateral when it issues letters of credit on behalf of its customers as it does when making other types of loans.
	As of March 31, 2014, the Company had approximately $1.7 million in capital expenditure commitments outstanding which relate to various projects to renovate existing branches.
	Concentrations of credit risk:  The majority of the loans, commitments to extend credit and standby letters of credit have been granted to customers in the Company’s market area.  As of March 31, 2014, approximately 29% of our investments in securities issued by states and political subdivisions were within the state of Illinois.  We did not hold any direct exposure to the state of Illinois as of March 31, 2014. The distribution of commitments to extend credit approximates the distribution of loans outstanding.  Standby letters of credit are granted primarily to commercial borrowers. Lease banking provides banking services to lessors located throughout the United States. Our leasing subsidiaries originate leases to companies located through the United States.
	Contingencies: In the normal course of business, the Company is involved in various legal proceedings.  In the opinion of management, any liability resulting from pending proceedings would not be expected to have a material adverse effect on the Company’s consolidated financial statements.
	On July 26, 2013, an action captioned James Sullivan v. Taylor Capital Group, Inc., et al., Case No. 2013-CH17751 (the “Sullivan Action”) was commenced against Taylor Capital, the board of directors of Taylor Capital (the “Taylor Capital Board”), and MB Financial (collectively, the “Defendants”) in the Circuit Court of Cook County, Illinois (the “Court”), alleging that the Taylor Capital Board breached its fiduciary duties in connection with the pending MB Financial/Taylor Capital merger (the “Merger”) and that MB Financial aided and abetted those breaches of fiduciary duty. On August 8, 2013, a stockholder class action captioned Dennis Panozzo v. Taylor Capital Group, Inc., et. al., Case No. 2013-CH-18546 (the “Panozzo Action”) was commenced against the Defendants in the Court making similar allegations in connection with the Merger. Subsequently, on September 10, 2013, the Sullivan Action and the Panozzo Action were consolidated pursuant to Court order under the first-filed Sullivan Action, Case No. 2013-CH17751 (as so consolidated, the “Action”). On October 24, 2013, the plaintiffs in the Action (the “Plaintiffs”) filed a consolidated amended class action complaint, alleging that the Taylor Capital Board breached its fiduciary duties in connection with the Merger, including by making incomplete and misleading disclosures concerning the Merger, and that MB Financial aided and abetted those breaches of fiduciary duty.
	On February 17, 2014, solely to eliminate the costs, risks, burden, distraction and expense of further litigation and to put the claims that were or could have been asserted to rest, the Defendants entered into a memorandum of understanding (the “MOU”) with the Plaintiffs regarding the settlement of the Action pursuant to which Taylor Capital and MB Financial agreed to make certain supplemental disclosures concerning the Merger, which each of Taylor Capital and MB Financial did in a Current Report on Form 8-K filed by each company on February 18, 2014 (the “Form 8-Ks”). The MOU also provides that, solely for purposes of settlement, the Court will certify a class consisting of all persons who were record or beneficial stockholders of Taylor Capital when the Merger was approved by the Taylor Capital Board or any time thereafter (the “Class”). In addition, the MOU provides that, subject to approval by the Court after notice to the members of the Class (the “Class Members”), the Action will be dismissed with prejudice and all claims that the Class Members may possess with regard to the Merger, with the exception of claims for statutory appraisal, will be released. In connection with the settlement, the Plaintiffs’ counsel has expressed their intention to seek an award by the Court of attorneys’ fees and expenses. The amount of the award to the Plaintiffs’ counsel will ultimately be determined by the Court. This payment will not affect the amount of merger consideration to be paid by MB Financial or that any Taylor Capital stockholder will receive in the Merger. There can be no assurance that the parties will ultimately enter into a definitive settlement agreement or that the Court will approve the settlement even if the parties enter into such an agreement. There can be no assurance that the Court will approve the settlement. In the absence of such approval, the proposed settlement as contemplated by the MOU would be terminated.
	The Defendants continue to believe that the Action is without merit, have vigorously denied, and continue to vigorously deny, all of the allegations of wrongful or actionable conduct asserted in the Action, and the Taylor Capital Board vigorously maintains that it diligently and scrupulously complied with its fiduciary duties, that the joint proxy statement/prospectus dated January 14, 2014 mailed to the stockholders of Taylor Capital and MB Financial was complete and accurate in all material respects and that no further disclosure was required under applicable law. The Defendants are entering into the MOU and the contemplated settlement solely to eliminate the costs, risks, burden, distraction and expense of further litigation and to put the claims that were or could have been asserted to rest. Nothing in the MOU, any settlement agreement or any public filing, including the Form 8-Ks, shall be deemed an admission of the legal necessity of filing or the materiality under applicable laws of any of the additional information contained therein or in any public filing associated with the proposed settlement of the Action.
	Based on information currently available, consultations with counsel and established reserves, management believes that the eventual outcome of this litigation will not have a material adverse effect on the Company's consolidated financial position or results of operations.

Fair_Value_Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Measurements	'
	Fair Value Measurements
	ASC Topic 820 defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. A fair value measurement assumes that the transaction to sell the asset or transfer the liability occurs in the principal market for the asset or liability or, in the absence of a principal market, the most advantageous market for the asset or liability. The price in the principal (or most advantageous) market used to measure the fair value of the asset or liability shall not be adjusted for transaction costs. An orderly transaction is a transaction that assumes exposure to the market for a period prior to the measurement date to allow for marketing activities that are usual and customary for transactions involving such assets and liabilities; it is not a forced transaction. Market participants are buyers and sellers in the principal market that are (i) independent, (ii) knowledgeable, (iii) able to transact and (iv) willing to transact.
	ASC Topic 820 requires the use of valuation techniques that are consistent with the market approach, the income approach and/or the cost approach. The market approach uses prices and other relevant information generated by market transactions involving identical or comparable assets and liabilities. The income approach uses valuation techniques to convert expected future amounts, such as cash flows or earnings, to a single present value amount on a discounted basis. The cost approach is based on the amount that currently would be required to replace the service capacity of an asset (replacement cost). Valuation techniques should be consistently applied. Inputs to valuation techniques refer to the assumptions that market participants would use in pricing the asset or liability. Inputs may be observable, meaning those that reflect the assumptions market participants would use in pricing the asset or liability developed based on market data obtained from independent sources, or unobservable, meaning those that reflect the reporting entity's own assumptions about the assumptions market participants would use in pricing the asset or liability developed based on the best information available in the circumstances. In that regard, ASC Topic 820 establishes a fair value hierarchy for valuation inputs that gives the highest priority to quoted prices in active markets for identical assets or liabilities and the lowest priority to unobservable inputs. The fair value hierarchy is as follows:
	Level 1: Quoted prices (unadjusted) for identical assets or liabilities in active markets that the entity has the ability to access as of the measurement date.
	Level 2: Significant other observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data.
	Level 3: Significant unobservable inputs that reflect a reporting entity's own assumptions about the assumptions that market participants would use in pricing an asset or liability.
	A description of the valuation methodologies used for instruments measured at fair value, as well as the general classification of such instruments pursuant to the valuation hierarchy, is set forth below.
	In general, fair value is based upon quoted market prices, where available. If such quoted market prices are not available, fair value is based upon internally developed models that primarily use, as inputs, observable market-based parameters. Valuation adjustments may be made to ensure that financial instruments are recorded at fair value. These adjustments may include amounts to reflect counterparty credit quality, the Company's creditworthiness, among other things, as well as unobservable parameters. Any such valuation adjustments are applied consistently over time. Our valuation methodologies may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. While management believes the Company's valuation methodologies are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different estimate of fair value at the reporting date. Transfers between levels of the fair value hierarchy are recognized on the actual date of the event or circumstances that caused the transfer, which generally coincides with the Company's monthly and/or quarterly valuation process.
	Financial Instruments Recorded at Fair Value on a Recurring Basis
	Securities Available for Sale. The fair values of securities available for sale are determined by quoted prices in active markets, when available, and classified as Level 1. If quoted market prices are not available, the fair value is determined by a matrix pricing, which is a mathematical technique widely used in the industry to value debt securities without relying exclusively on quoted prices for the specific securities but rather by relying on the securities' relationship to other benchmark quoted securities and classified as Level 2. In cases where significant credit valuation adjustments are incorporated into the estimation of fair value, reported amounts are classified as Level 3.
	Loans Held for Sale. Mortgage loans originated and held for sale in the secondary market are carried at fair value. The fair value of loans held for sale is determined using quoted secondary market prices and classified as level 2.
	Assets Held in Trust for Deferred Compensation and Associated Liabilities. Assets held in trust for deferred compensation are recorded at fair value and included in “Other Assets” on the consolidated balance sheets. These assets are invested in mutual funds and classified as Level 1. Deferred compensation liabilities, also classified as Level 1, are carried at the fair value of the obligation to the employee, which corresponds to the fair value of the invested assets.
	Derivatives. Currently, we use interest rate swaps to manage our interest rate risk. The valuation of these instruments is determined using widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of each derivative and classified as Level 2. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including LIBOR rate curves. We also obtain dealer quotations for these derivatives for comparative purposes to assess the reasonableness of the model valuations. We also offer other derivatives, including foreign currency forward contracts and interest rate lock commitments, to our customers and offset our exposure from such contracts by purchasing other financial contracts, which are valued using market consensus prices.
	The following table summarizes financial assets and financial liabilities measured at fair value on a recurring basis as of March 31, 2014 and December 31, 2013, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value (in thousands):
			Total				Quoted Prices in				Significant Other				Significant
							Active Markets for				Observable Inputs				Unobservable Inputs
							Identical Assets				(Level 2)				(Level 3)
							(Level 1)
	31-Mar-14
	Financial assets
	Securities available for sale:
	U.S Government sponsored agencies and enterprises		$	51,836			$	—			$	51,836			$	—
	States and political subdivisions		19,350				—				19,350				—
	Residential mortgage-backed securities		673,515				—				672,864				651
	Commercial mortgage-backed securities		52,924				—				52,924				—
	Corporate bonds		273,853				—				269,005				4,848
	Equity securities		10,572				10,572				—				—
	Loans held for sale		802				—				802				—
	Assets held in trust for deferred compensation		11,451				11,451				—				—
	Derivative financial instruments		16,696				—				16,696				—
	Financial liabilities
	Other liabilities (1)		11,366				11,366				—				—
	Derivative financial instruments		16,600				—				16,600				—
	December 31, 2013
	Financial assets
	Securities available for sale:
	U.S. Government sponsored agencies and enterprises		$	52,068			$	—			$	52,068			$	—
	States and political subdivisions		19,143				—				19,143				—
	Residential mortgage-backed securities		701,233				—				700,542				691
	Commercial mortgage-backed securities		52,941				—				52,941				—
	Corporate bonds		283,070				—				277,905				5,165
	Equity securities		10,457				10,457				—				—
	Loans held for sale		629				—				629				—
	Assets held in trust for deferred compensation		10,679				10,679				—				—
	Derivative financial instruments		18,645				—				18,645				—
	Financial liabilities
	Other liabilities (1)		10,569				10,569				—				—
	Derivative financial instruments		18,632				—				18,632				—
	(1) Liabilities associated with assets held in trust for deferred compensation
	The following table presents additional information about the unobservable inputs used in the fair value measurement of financial assets measured on a recurring basis that were categorized within the Level 3 of the fair value hierarchy:
		Fair Value at			Valuation	Unobservable
		March 31, 2014			Technique	Input	Range
	Residential mortgage-backed securities	$	651		Discounted cash flows	Constant pre-payment rates
						(CPR) assumption	1% - 3% CPR
	Corporate bonds	4,848			Discounted cash flows	Credit assumption	20% Loss
	The Company did not have any transfers between Level 1 and Level 2 of the fair value hierarchy during the three months ended March 31, 2014. The Company's policy for determining transfers between levels occurs at the end of the reporting period when circumstances in the underlying valuation criteria change and result in transfer between levels.
	The following table presents additional information about financial assets measured at fair value on a recurring basis for which the Company used significant unobservable inputs (Level 3):
			Three Months Ended
			March 31,
	(in thousands)		2014				2013
	Balance, beginning of period		$	5,856			$	6,071
	Other comprehensive income		(179		)		(103		)
	Principal payments		(178		)		(40		)
Balance, ending of period		$	5,499			$	5,928
Financial Instruments Recorded at Fair Value on a Nonrecurring Basis
The Company may be required, from time to time, to measure certain financial assets and financial liabilities at fair value on a nonrecurring basis in accordance with U.S. GAAP. These include assets that are measured at the lower of cost or fair value that were recognized at fair value below cost at the end of the period.
Impaired Loans. Loans for which it is probable that payment of interest and principal will not be made in accordance with the contractual terms of the loan agreement are considered impaired. Once a loan is identified as individually impaired, management measures impairment in accordance with ASC Topic 310. The fair value of impaired loans is estimated using one of several methods, including collateral value, market value of similar debt, enterprise value, liquidation value and discounted cash flows. Those impaired loans not requiring an allowance represent loans for which the fair value of the expected repayments or collateral exceed the recorded investments in such loans. In accordance with ASC Topic 820, impaired loans where an allowance is established based on the fair value of collateral require classification in the fair value hierarchy. Collateral values are estimated using Level 3 inputs based on customized discounting criteria. For a majority of impaired real estate loans where an allowance is established based on the fair value of collateral (100% at March 31, 2014), the Company obtains a current external appraisal. Other valuation techniques are used as well, including internal valuations, comparable property analysis and contractual sales information.
Non-Financial Assets and Non-Financial Liabilities Recorded at Fair Value
The Company has no non-financial assets or non-financial liabilities measured at fair value on a recurring basis. Certain non-financial assets and non-financial liabilities measured at fair value on a non-recurring basis include foreclosed assets and non-financial long-lived assets.
Other Real Estate and Repossessed Vehicles Owned (Foreclosed Assets). Foreclosed assets, upon initial recognition, are measured and reported at fair value through a charge-off to the allowance for loan losses based upon the fair value of the foreclosed asset. The fair value of foreclosed assets, upon initial recognition, are estimated using Level 3 inputs based on customized discounting criteria.
Non-Financial Long-Lived Assets.  Non-financial long-lived assets, when determined to be impaired, are measured and reported at fair value using Level 3 inputs based on customized discounting criteria.
Assets measured at fair value on a nonrecurring basis as of March 31, 2014 and December 31, 2013 are included in the table below (in thousands):
		Total				Quoted Prices in Active				Significant Other				Significant
						Markets for Identical				Observable Inputs				Unobservable Inputs
						Assets (Level 1)				(Level 2)				(Level 3)
31-Mar-14
Financial assets:
Impaired loans		$	99,923			$	—			$	—			$	99,923
Non-financial assets:
Foreclosed assets		44,382				—				—				44,382
December 31, 2013
Financial assets:
Impaired loans		$	77,497			$	—			$	—			$	77,497
Non-financial assets:
Foreclosed assets		44,601				—				—				44,601
The following table presents additional information about the unobservable inputs used in the fair value measurement of financial assets measured on a nonrecurring basis that were categorized within the Level 3 of the fair value hierarchy:
	Fair Value at			Valuation	Unobservable
	March 31, 2014			Technique	Input	Range
Impaired loans	$	99,923		Appraisal of collateral	Appraisal adjustments - sales costs	5% - 10%
Foreclosed assets	44,382			Appraisal of collateral	Appraisal adjustments - sales costs	5% - 10%
ASC Topic 825 requires disclosure of the fair value of financial assets and financial liabilities, including those financial assets and financial liabilities that are not measured and reported at fair value on a recurring basis or non-recurring basis. The methodologies for estimating the fair value of financial assets and financial liabilities that are measured at fair value on a recurring or non-recurring basis are discussed above. The estimated fair value approximates carrying value for cash and cash equivalents, accrued interest and the cash surrender value of life insurance policies. The methodologies for other financial assets and financial liabilities are discussed below:
The following methods and assumptions were used by the Company in estimating the fair values of its other financial instruments:
Cash and due from banks, interest earning deposits with banks and federal funds sold: The carrying amounts reported in the balance sheet approximate fair value.
Securities held to maturity: The fair values of securities held to maturity are determined by quoted prices in active markets, when available, and classified as Level 1. If quoted market prices are not available, the fair value is determined by a matrix pricing, which is a mathematical technique widely used in the industry to value debt securities without relying exclusively on quoted prices for the specific securities but rather by relying on the securities' relationship to other benchmark quoted securities and classified as Level 2. In cases where significant credit valuation adjustments are incorporated into the estimation of fair value, reported amounts are classified as Level 3.
Non-marketable securities - FHLB and FRB Stock: The carrying amounts reported in the balance sheet approximate fair value.
Loans: The fair values for loans are estimated using discounted cash flow analyses, using the corporate bond curve adjusted for liquidity for commercial loans and the swap curve adjusted for liquidity for retail loans.
Non-interest bearing deposits: The fair values disclosed are equal to their balance sheet carrying amounts, which represent the amount payable on demand.
Interest bearing deposits: The fair values disclosed for deposits with no defined maturities are equal to their carrying amounts, which represent the amounts payable on demand. Fair values for certificates of deposit are estimated using a discounted cash flow calculation that applies the Company's current incremental borrowing rates for similar terms.
Short-term borrowings: The carrying amounts of federal funds purchased, borrowings under repurchase agreements and other short-term borrowings with maturities of 90 days or less approximate their fair values.  The fair value of short-term borrowings greater than 90 days is based on the discounted value of contractual cash flows.
Long-term borrowings: The fair values of the Company's long-term borrowings (other than deposits) are estimated using discounted cash flow analyses, based on the Company's current incremental borrowing rates for similar types of borrowing arrangements.
Junior subordinated notes issued to capital trusts: The fair values of the Company's junior subordinated notes issued to capital trusts are estimated based on the quoted market prices, when available, of the related trust preferred security instruments, or are estimated based on the quoted market prices of comparable trust preferred securities.
Accrued interest: The carrying amount of accrued interest receivable and payable approximate their fair values.
Off-balance-sheet instruments: Fair values for the Company’s off-balance-sheet lending commitments (guarantees, letters of credit and commitments to extend credit) are based on fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements.
The estimated fair values of financial instruments are as follows (in thousands):
		31-Mar-14
		Carrying Amount				Estimated Fair Value			Quoted Prices in Active			Significant Other			Significant
									Markets for Identical			Observable Inputs			Unobservable Inputs
									Assets (Level 1)			(Level 2)			(Level 3)
Financial Assets:
Cash and due from banks		$	268,803			$	268,803		$	268,803		$	—		$	—
Federal funds sold		7,500				7,500			7,500			—			—
Interest earning deposits with banks		244,819				244,819			244,819			—			—
Investment securities available for sale		1,082,050				1,082,050			10,572			1,065,979			5,499
Investment securities held to maturity		1,188,692				1,223,471			—			1,223,471			—
Non-marketable securities - FHLB and FRB stock		51,432				51,432			—			—			51,432
Loans held for sale		802				802			—			802			—
Loans, net		5,461,563				5,418,234			—			—			5,418,234
Accrued interest receivable		35,065				35,065			35,065			—			—
Derivative financial instruments		16,696				16,696			—			16,696			—
Financial Liabilities:
Noninterest bearing deposits		$	2,435,868			$	2,435,868		$	2,435,868		$	—		$	—
Interest bearing deposits		5,049,879				5,057,386			—			—			5,057,386
Short-term borrowings		189,872				189,865			—			—			189,865
Long-term borrowings		65,664				69,862			—			—			69,862
Junior subordinated notes issued to capital trusts		152,065				102,577			—			—			102,577
Accrued interest payable		2,014				2,014			2,014			—			—
Derivative financial instruments		16,600				16,600			—			16,600			—
		December 31, 2013
		Carrying Amount				Estimated Fair Value			Quoted Prices in Active			Significant Other			Significant
									Markets for Identical			Observable Inputs			Unobservable Inputs
									Assets (Level 1)			(Level 2)			(Level 3)
Financial Assets:
Cash and due from banks		$	205,193			$	205,193		$	205,193		$	—		$	—
Interest earning deposits with banks		268,266				268,266			268,266			—			—
Federal funds sold		42,950				42,950			42,950			—			—
Investment securities available for sale		1,118,912				1,118,912			10,457			1,102,599			5,856
Investment securities held to maturity		1,182,533				1,198,929			—			1,198,929			—
Non-marketable securities - FHLB and FRB stock		51,417				51,417			—			—			51,417
Loans held for sale		629				629			—			629			—
Loans, net		5,600,805				5,583,759			—			—			5,583,759
Accrued interest receivable		36,593				36,593			36,593			—			—
Derivative financial instruments		18,645				18,645			—			18,645			—
Financial Liabilities:
Non-interest bearing deposits		$	2,375,863			$	2,375,863		$	2,375,863		$	—		$	—
Interest bearing deposits		5,005,396				5,012,928			—			—			5,012,928
Short-term borrowings		493,389				493,384			—			—			493,384
Long-term borrowings		62,159				66,301			—			—			66,301
Junior subordinated notes issued to capital trusts		152,065				101,247			—			—			101,247
Accrued interest payable		2,042				2,042			2,042			—			—
Derivative financial instruments		18,632				18,632			—			18,632			—

Stock_Incentive_Plans

Stock Incentive Plans	3 Months Ended
	Mar. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Stock Incentive Plans	'
	Stock Incentive Plans
	ASC Topic 718 requires that the grant date fair value of equity awards to employees be recognized as compensation expense over the period during which an employee is required to provide service in exchange for such award.
	The following table summarizes the impact of the Company’s share-based payment plans in the financial statements for the periods shown (in thousands):
		Three Months Ended
		March 31,
		2014				2013
	Total cost of share-based payment plans during the period	$	2,012			$	1,260
	Amount of related income tax benefit recognized in income	790				501
	The Company adopted the Omnibus Incentive Plan (the “Omnibus Plan”) in 1997.  In June 2011, the Company’s stockholders approved an amendment and restatement of the Omnibus Plan to add 2,300,000 authorized shares for a total of 8,300,000 shares of common stock for issuance to directors, officers, and employees of the Company or any of its subsidiaries.  Equity grants under the Omnibus Plan can be in the form of incentive stock options, non-qualified stock options, stock appreciation rights, restricted stock, restricted stock units, performance shares, performance units, and other stock-based awards.  Shares awarded in the form of restricted stock, restricted stock units, performance shares, performance units, or other stock-based awards generally will reduce the shares available under the Omnibus Plan on a 2-for-1 basis.  As of March 31, 2014, there were 943,653 shares available for future grants.
	Prior to 2014, annual equity-based incentive awards were typically granted to selected officers and employees mid-year. These awards are now granted in the first quarter of the year starting in 2014.  Options are granted with an exercise price equal to no less than the market price of the Company’s shares at the date of grant; those option awards generally vest over four years of service and have 10-year contractual terms.  Restricted shares and units typically vest over a two to four year period.  Equity awards may also be granted at other times throughout the year in connection with the recruitment and retention of officers and employees.  Directors currently may elect, in lieu of cash, to receive up to 70% of their fees in stock options with a five year term, which are fully vested on the grant date (provided that the director may not sell the underlying shares for at least six months after the grant date), and up to 100% of their fees in restricted shares, which vest one year after the grant date.
	The following table summarizes stock options outstanding for the three months ended March 31, 2014:
		Number of			Weighted			Weighted	Aggregate
		Options			Average			Average	Intrinsic
					Exercise			Remaining	Value
					Price			Contractual	(in thousands)
								Term
								(In Years)
	Options outstanding as of December 31, 2013	2,443,752			$	27.57
	Granted	187,403			29.87
	Exercised	(51,292	)		19.45
	Expired or cancelled	(17,800	)		31.23
	Forfeited	(13,082	)		21.22
	Options outstanding as of March 31, 2014	2,548,981			$	27.9		4.88	$	12,732
	Options exercisable as of March 31, 2014	1,708,542			$	30.24		3.22	$	6,180
	The fair value of each option award is estimated on the date of grant using the Black-Scholes option pricing model based on certain assumptions.  Expected volatility is based on historical volatility and the expectations of future volatility of Company shares.  The risk free interest rate for periods within the contractual term of the option is based on the U.S. Treasury yield curve in effect at the time of the grant.  The expected life of options is estimated based on historical employee behavior and represents the period of time that options granted are expected to remain outstanding.
	The following assumptions were used for options granted during the three months ended March 31, 2014:
		March 31, 2014
	Risk-free interest rate	1.89		%
	Expected volatility of Company’s stock	23.67		%
	Expected dividend yield	1.61		%
	Expected life of options	5.9 years
	Weighted average fair value per option of options granted during the year	$	6.31
	The total intrinsic value of options exercised during the three months ended March 31, 2014 and 2013 was $550 thousand and $2 thousand, respectively.
	The following is a summary of changes in restricted shares and units for the three months ended March 31, 2014:
		Number of			Weighted
		Shares and Units			Average
					Grant Date
					Fair Value
	Shares Outstanding at December 31, 2013	685,719			$	22.59
	Granted	256,951			30.59
	Vested	(33,575	)		21.44
	Forfeited	(6,274	)		22.9
	Shares Outstanding at March 31, 2014	902,821			$	24.91
	The total intrinsic value of restricted shares that vested during the three months ended March 31, 2014 and 2013 was $1.0 million and $293 thousand, respectively.
	The Company issued 48,569, 56,752 and 65,333 market-based restricted stock units in 2014, 2013 and 2012, respectively, which entitle recipients to shares of common stock at the end of a three year vesting period. Recipients will earn shares, totaling between 0% and 175% of the number of units issued, based on the Company's total stockholder return relative to a specified peer group of financial institutions over the three year period. The market-based restricted stock units are included in the preceding table as if the recipients earned shares equal to 100% of the units issued. A Monte Carlo simulation model was used to value the market-based restricted stock units at the time of issuance.
	The Company issued 92,717 shares of market-based restricted stock in 2011.  The market component of the vesting terms for the award requires that, for ten consecutive trading days, the closing price of the Company’s stock be at least $27.00.  The market component for this award has been satisfied as of March 31, 2014 and will vest in full in 2014, on the third anniversary of the grant date. A Monte Carlo simulation model was used to value the market-based restricted stock awards at the time of issuance.
	As of March 31, 2014, there was $19.4 million of total unrecognized compensation cost related to nonvested share-based compensation arrangements (including share option and nonvested share awards) granted under the Omnibus Plan.  At March 31, 2014, the weighted-average period over which the unrecognized compensation expense is expected to be recognized was approximately 2.9 years.

Derivative_Financial_Instrumen

Derivative Financial Instruments	3 Months Ended
	Mar. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Derivative Financial Instruments	'
	Derivative Financial Instruments
	The Company offers various derivatives, including interest rate swaps and foreign currency forward contracts, to our customers which can mitigate our exposure to market risk through the execution of off-setting positions with inter-bank dealer counterparties. This also permits the Company to offer customized risk management solutions to our customers. These customer accommodations and any offsetting financial contracts are treated as non-designated derivative instruments and carried at fair value through an adjustment to the income statement.
	Interest rate swap and foreign currency forward contracts involve the risk of dealing with counterparties and their ability to meet contractual terms. The net amount payable or receivable under interest rate swaps is accrued as an adjustment to interest income.  The net amount receivable as of March 31, 2014 was approximately $6 thousand, and the net amount payable as of December 31, 2013 was approximately $25 thousand.  The Company's credit exposure on interest rate swaps is limited to the Company's net favorable value and interest payments of all swaps to each counterparty. In such cases, collateral is generally required from the counterparties involved if the net value of the swaps exceeds a nominal amount.  At March 31, 2014, the Company’s credit exposure relating to interest rate swaps was approximately $15.5 million, which is secured by the underlying collateral on customer loans.
	The Company also enters into mortgage banking derivatives which are classified as non-designated 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 residential mortgage loans 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 had fair value commercial loan interest rate swaps, to hedge its interest rate risk, with an aggregate notional amount of $228 thousand at March 31, 2014.  For fair value hedges, the changes in fair values of both the hedging derivative and the hedged item were recorded in current earnings as other income.
	The Company’s derivative financial instruments are summarized below as of March 31, 2014 and December 31, 2013 (in thousands):
		Asset Derivatives									Liability Derivatives
		31-Mar-14					December 31, 2013				31-Mar-14					December 31, 2013
		Notional		Estimated			Notional		Estimated		Notional		Estimated			Notional			Estimated
		Amount		Fair Value			Amount		Fair Value		Amount		Fair Value			Amount			Fair Value
	Derivative instruments designated as hedges of fair value:
	Interest rate swap contracts (1)	$	—	$	—		$	—	$	—	$	228	$	(21	)	$	238		$	(23	)
	Stand-alone derivative instruments (2)
	Interest rate swap contracts	563,291		15,500			550,883		17,298		564,210		(15,543		)	551,798			(17,350		)
	Interest rate options contracts	86,057		308			83,907		323		86,057		(308		)	84,953			(323		)
	Foreign exchange contracts	26,222		858			31,361		1,006		25,845		(726		)	47,760			(935		)
	Spot foreign exchange contracts	1,153		8			—		—		741		—			—			—
	Mortgage banking derivatives	1,573		22			1,783		18		594		(2		)	250			(1		)
	Total non-hedging derivative instruments	678,296		16,696			667,934		18,645		677,447		(16,579		)	684,761			(18,609		)
	Total	$	678,296	$	16,696		$	667,934	$	18,645	$	677,675	$	(16,600	)	$	684,999		$	(18,632	)
	(1) Hedged fixed-rate commercial real estate loans
	(2) These portfolio swaps are not designated as hedging instruments under ASC Topic 815.
	Amounts included in the other income in the consolidated statements of operations related to derivative financial instruments were as follows (in thousands):
		Three Months Ended
		March 31,
		2014		2013
	Derivative instruments designated as hedges of fair value:
	Interest rate swap contracts	$	—	$	(1	)
	Stand-alone derivative instruments:
	Interest rate swap contracts	9		11
	Interest rate options contracts	—		—
	Foreign exchange contracts	61		5
	Spot foreign exchange contracts	8		—
	Mortgage banking derivatives	3		(13		)
	Total non-hedging derivative instruments	81		3
	Total	$	81	$	2
	Methods and assumptions used by the Company in estimating the fair value of its interest rate swaps are discussed in Note 13 to consolidated financial statements.
	Certain instruments and transactions subject to an agreement similar to a master netting arrangement are eligible for offset in the consolidated balance sheet. The instruments and transactions would include derivatives, sale and repurchase agreements and reverse sale and repurchase agreements, and securities borrowing and securities lending arrangements. The Company’s derivative transactions with financial institution counterparties are generally executed under International Swaps and Derivative Association (“ISDA”) master agreements which include “right of set-off” provisions. Under these agreements, there is generally a legally enforceable right to offset recognized amounts, and there may be an intention to settle such amounts on a net basis. The Company, however, does not generally offset such financial instruments for financial reporting purposes.
	Information about the Company's financial instruments that are eligible for offset in the consolidated balance sheet as of March 31, 2014 is summarized below (in thousands):
		Financial Assets							Financial Liabilities
		Gross Amount Recognized		Gross Amount Offset			Net Amount Recognized		Gross Amount Recognized		Gross Amount Offset		Net Amount Recognized
	Derivatives:
	Interest rate swaps, caps and floors	$	3,896	$	—		$	3,896	$	11,976	$	—	$	11,976
	Foreign currency forward contracts	67		—			67		675		—		675
	Mortgage banking derivatives	1		—			1		1		—		1
	Total derivatives	3,964		—			3,964		12,652		—		12,652
	Repurchase agreements	—		—			—		189,872		—		189,872
	Total	$	3,964	$	—		$	3,964	$	202,524	$	—	$	202,524
		Financial Assets									Financial Liabilities
		Net Amount Recognized		Financial Instruments			Collateral		Net Amount		Net Amount Recognized		Financial Instruments			Collateral			Net Amount
	Derivatives:
	Counterparty A	$	389	$	(389	)	$	—	$	—	$	10,186	$	(388	)	$	(9,798	)	$	—
	Counterparty B	1,227		(810		)	—		417		810		(810		)	—			—
	Counterparty C	1,788		(1,631		)	—		157		1,631		(1,631		)	—			—
	Other counterparties	560		(7		)	—		553		25		(7		)	—			18
	Total derivatives	3,964		(2,837		)	—		1,127		12,652		(2,836		)	(9,798		)	18
	Repurchase agreements	—		—			—		—		189,872		—			(189,872		)	—
	Total	$	3,964	$	(2,837	)	$	—	$	1,127	$	202,524	$	(2,836	)	$	(199,670	)	$	18
	Information about the Company's financial instruments that are eligible for offset in the consolidated balance sheet as of December 31, 2013 is summarized below (in thousands):
		Financial Assets							Financial Liabilities
		Gross Amount Recognized		Gross Amount Offset			Net Amount Recognized		Gross Amount Recognized		Gross Amount Offset		Net Amount Recognized
	Derivatives:
	Interest rate swaps, caps and floors	$	5,792	$	—		$	5,792	$	11,904	$	—	$	11,904
Foreign currency forward contracts	80		—			80		848		—		848
Mortgage banking derivatives	3		—			3		1		—		1
Total derivatives	5,875		—			5,875		12,753		—		12,753
Repurchase agreements	—		—			—		193,389		—		193,389
Total	$	5,875	$	—		$	5,875	$	206,142	$	—	$	206,142
	Financial Assets									Financial Liabilities
	Net Amount Recognized		Financial Instruments			Collateral		Net Amount		Net Amount Recognized		Financial Instruments			Collateral			Net Amount
Derivatives:
Counterparty A	$	883	$	(883	)	$	—	$	—	$	10,669	$	(883	)	$	(9,786	)	$	—
Counterparty B	1,836		(412		)	—		1,424		412		(412		)	—			—
Counterparty C	2,380		(1,612		)	—		768		1,612		(1,612		)	—			—
Other counterparties	776		(5		)	—		771		60		(5		)	—			55
Total derivatives	5,875		(2,912		)	—		2,963		12,753		(2,912		)	(9,786		)	55
Repurchase agreements	—		—			—		—		193,389		—			(193,389		)	—
Total	$	5,875	$	(2,912	)	$	—	$	2,963	$	206,142	$	(2,912	)	$	(203,175	)	$	55

Operating_Segments

Operating Segments	3 Months Ended
	Mar. 31, 2013
Segment Reporting [Abstract]	'
Operating Segments	'
	Operating Segments
	The Company's operations consist of two reportable operating segments: banking and leasing. The Company offers different products and services through its two segments, and the regulatory environment is significantly different for banking compared to leasing. The accounting policies of the segments are generally the same as those of the consolidated company.
	The banking segment generates its revenues primarily from its lending and deposit gathering activities. The profitability of this segment's operations depends primarily on its net interest income after provision for credit losses, which is the difference between interest earned on interest earning assets and interest paid on interest bearing liabilities less provision for credit losses.  The provision for credit losses is dependent on changes in its loan portfolio and management’s assessment of the collectability of the loan portfolio as well as prevailing economic and market conditions.  The banking segment is also subject to an extensive system of laws and regulations that are intended primarily for the protection of customers and depositors.  These laws and regulations govern such areas as capital, permissible activities, allowance for loan losses, loans and investments, and rates of interest that can be charged on loans.
	The leasing segment generates its revenues through lease originations and related services offered through the Company's leasing subsidiaries, LaSalle Systems Leasing, Inc. and Celtic Leasing Corp. The leasing subsidiaries invest directly in equipment that we lease (referred to as direct finance, leveraged or operating leases) to "Fortune 1000," large middle-market companies and healthcare providers located throughout the United States. The lease portfolio is made up of various kinds of equipment, generally technology related, such as computer systems, satellite equipment, medical equipment and general manufacturing equipment. The leasing subsidiaries also specialize in selling third party equipment maintenance contracts to large companies.
	Net interest income for the leasing segment includes adjustments based on the Company's internal funds transfer pricing model as well as interest on loans originated for the sole purpose of funding equipment purchases related to leases at the Company's lease subsidiaries. The provision for credit losses and non-interest expense for the leasing segment includes adjustments for internal allocations of certain expenses.
	The following table presents summary financial information for the reportable segments (in thousands):
		Banking			Leasing		Consolidated
	Three months ended March 31, 2014
	Net interest income	$	65,119		$	2,209	$	67,328
	Provision for credit losses	1,080			70		1,150
	Non-interest income	24,258			12,354		36,612
	Non-interest expense	67,697			8,350		76,047
	Income tax expense	4,483			2,291		6,774
	Net income	$	16,117		$	3,852	$	19,969
	Total assets	$	8,968,195		$	469,108	$	9,437,303
	Three months ended March 31, 2013
	Net interest income	$	66,806		$	879	$	67,685
	Provision for credit losses	(47		)	47		—
	Non-interest income	22,909			15,794		38,703
	Non-interest expense	63,677			7,752		71,429
	Income tax expense	6,700			3,353		10,053
	Net income	$	19,385		$	5,521	$	24,906
	Total assets	$	9,025,700		$	360,130	$	9,385,830

New_Authoritative_Accounting_G1

New Authoritative Accounting Guidance (Policies)	3 Months Ended
	Mar. 31, 2014
New Authoritative Accounting Guidance [Abstract]	'
New Authoritative Accounting Pronouncements	'
	New Authoritative Accounting Guidance
	ASC Topic 740 “Income Taxes.” New authoritative accounting guidance under ASC Topic 740, “Income Taxes” amended prior guidance to include explicit guidance on the financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. An unrecognized tax benefit, or a portion of an unrecognized tax benefit, should be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward, except as follows. To the extent a net operating loss carryforward, a similar tax loss, or a tax credit carryforward is not available at the reporting date under the tax law of the applicable jurisdiction to settle any additional income taxes that would result from the disallowance of a tax position or the tax law of the applicable jurisdiction does not require the entity to use, and the entity does not intend to use, the deferred tax asset for such purpose, the unrecognized tax benefit should be presented in the financial statements as a liability and should not be combined with deferred tax assets. The Company adopted this new authoritative guidance on January 1, 2014, and it did not have an impact on the Company's statements of operations or financial condition.
	ASC Topic 310 “Receivables.” New authoritative accounting guidance under ASC Topic 310, “Receivables” amended prior guidance to clarify that an in substance repossession or foreclosure occurs, and a creditor is considered to have received physical
	possession of residential real estate property collateralizing a consumer mortgage loan, upon either (1) the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure or (2) the borrower conveying all interest in the residential real estate property to the creditor to satisfy that loan through completion of a deed in lieu of foreclosure or through a similar legal agreement. Additionally, the amendments require interim and annual disclosures. The new authoritative guidance will be for reporting periods after January 1, 2015 and is not expected to have an impact on the Company's statements of operations or financial condition.
	ASC Topic 323 “Investments - Equity Method and Joint Ventures.” New authoritative accounting guidance under ASC Topic 323, “Investments - Equity Method and Joint Ventures” amended prior guidance to permit entities to make an accounting policy election to account for their investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met. Under the proportional amortization method, an entity amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received and recognizes the net investment performance in the statement of operation as a component of income tax expense. The new authoritative guidance will be for reporting periods after January 1, 2015 and is not expected to have an impact on the Company's statements of operations or financial condition.

Earnings_Per_Common_Share_Tabl

Earnings Per Common Share (Tables)	3 Months Ended
	Mar. 31, 2014
Accounting Policies [Abstract]	'
Reconciliation of the number of shares used in the calculation of basic and diluted earnings (loss) per common share, net income available to common stockholders, and earnings per share	'
	The following table presents a reconciliation of the number of shares used in the calculation of basic and diluted earnings per common share (amounts in thousands, except share and per share data).
		Three Months Ended
		March 31,
		2014		2013
	Distributed earnings allocated to common stock	$	6,666	$	5,507
	Undistributed earnings	13,303		19,399
	Net income	19,969		24,906
	Less: earnings allocated to participating securities	—		1
	Earnings allocated to common stockholders	$	19,969	$	24,905
	Weighted average shares outstanding for basic earnings per common share	54,639,951		54,411,806
	Dilutive effect of equity awards	625,237		324,838
	Weighted average shares outstanding for diluted earnings per common share	55,265,188		54,736,644
	Basic earnings per common share	$	0.37	$	0.46
	Diluted earnings per common share	0.36		0.46

Investment_Securities_Tables

Investment Securities (Tables)	3 Months Ended
	Mar. 31, 2014
Investments Securities [Abstract]	'
Summary investment holdings	'
	Carrying amounts and fair values of investment securities were as follows (in thousands):
		Amortized			Gross			Gross			Fair
		Cost			Unrealized			Unrealized			Value
					Gains			Losses
	31-Mar-14
	Available for Sale
	U.S. Government sponsored agencies and enterprises	$	50,291		$	1,555		$	(10	)	$	51,836
	States and political subdivisions	19,285			206			(141		)	19,350
	Residential mortgage-backed securities	666,707			8,268			(1,460		)	673,515
	Commercial mortgage-backed securities	50,841			2,083			—			52,924
	Corporate bonds	272,490			2,947			(1,584		)	273,853
	Equity securities	10,703			—			(131		)	10,572
	Total Available for Sale	1,070,317			15,059			(3,326		)	1,082,050
	Held to Maturity
	States and political subdivisions	940,610			22,486			(1,466		)	961,630
	Residential mortgage-backed securities	248,082			13,759			—			261,841
	Total Held to Maturity	1,188,692			36,245			(1,466		)	1,223,471
	Total	$	2,259,009		$	51,304		$	(4,792	)	$	2,305,521
	December 31, 2013
	Available for Sale
	U.S. Government sponsored agencies and enterprises	$	50,486		$	1,704		$	(122	)	$	52,068
	States and political subdivisions	19,398			22			(277		)	19,143
	Residential mortgage-backed securities	696,415			8,555			(3,737		)	701,233
	Commercial mortgage-backed securities	50,891			2,050			—			52,941
	Corporate bonds	284,083			1,597			(2,610		)	283,070
	Equity securities	10,649			—			(192		)	10,457
	Total Available for Sale	1,111,922			13,928			(6,938		)	1,118,912
	Held to Maturity
	States and political subdivisions	932,955			7,584			(4,366		)	936,173
	Residential mortgage-backed securities	249,578			13,178			—			262,756
	Total Held to Maturity	1,182,533			20,762			(4,366		)	1,198,929
	Total	$	2,294,455		$	34,690		$	(11,304	)	$	2,317,841
Unrealized losses on investment securities and the fair value of the related securities	'
	Unrealized losses on investment securities and the fair value of the related securities at December 31, 2013 were as follows (in thousands):
		Less Than 12 Months						12 Months or More						Total
		Fair			Unrealized			Fair			Unrealized			Fair		Unrealized
		Value			Losses			Value			Losses			Value		Losses
	Available for Sale
	U.S. Government sponsored agencies and enterprises	$	18,598		$	(122	)	$	—		$	—		$	18,598	$	(122	)
	States and political subdivisions	2,275			(166		)	4,748			(111		)	7,023		(277		)
	Residential mortgage-backed securities	232,807			(2,905		)	44,182			(832		)	276,989		(3,737		)
	Corporate bonds	122,344			(2,606		)	705			(4		)	123,049		(2,610		)
	Equity securities	10,457			(192		)	—			—			10,457		(192		)
	Total Available for Sale	386,481			(5,991		)	49,635			(947		)	436,116		(6,938		)
	Held to Maturity
	States and political subdivisions	235,016			(4,330		)	1,301			(36		)	236,317		(4,366		)
	Total	$	621,497		$	(10,321	)	$	50,936		$	(983	)	$	672,433	$	(11,304	)
	Unrealized losses on investment securities and the fair value of the related securities at March 31, 2014 were as follows (in thousands):
		Less Than 12 Months						12 Months or More						Total
		Fair			Unrealized			Fair			Unrealized			Fair		Unrealized
		Value			Losses			Value			Losses			Value		Losses
	Available for Sale
	U.S. Government sponsored agencies and enterprises	$	18,660		$	(10	)	$	—		$	—		$	18,660	$	(10	)
	States and political subdivisions	849			(2		)	4,645			(139		)	5,494		(141		)
	Residential mortgage-backed securities	155,458			(1,047		)	23,387			(413		)	178,845		(1,460		)
	Corporate bonds	41,294			(408		)	10,350			(1,176		)	51,644		(1,584		)
	Equity securities	10,572			(131		)	—			—			10,572		(131		)
	Total Available for Sale	226,833			(1,598		)	38,382			(1,728		)	265,215		(3,326		)
	Held to Maturity
	States and political subdivisions	64,610			(1,366		)	4,399			(100		)	69,009		(1,466		)
	Total	$	291,443		$	(2,964	)	$	42,781		$	(1,828	)	$	334,224	$	(4,792	)
Summary of realized gains on the sale of investment securities available for sale	'
	Net gains (losses) recognized on investment securities available for sale were as follows (in thousands):
		Three Months Ended
		March 31,
		2014			2013
	Realized gains	$	318		$	—
	Realized losses	(1		)	(1		)
	Net gains (losses)	$	317		$	(1	)
Schedule of remaining contractual maturities of securities included in the securities portfolio	'
	The amortized cost and fair value of investment securities as of March 31, 2014 by contractual maturity are shown below. Maturities may differ from contractual maturities in mortgage-backed securities because the mortgages underlying the securities may be called or repaid without any penalties. Therefore, mortgage-backed securities are not included in the maturity categories in the following maturity summary.
		Amortized			Fair
	(In thousands)	Cost			Value
	Available for sale:
	Due in one year or less	$	503		$	503
	Due after one year through five years	325,427			328,517
	Due after five years through ten years	7,657			7,735
	Due after ten years	8,479			8,284
	Equity securities	10,703			10,572
	Residential and commercial mortgage-backed securities	717,548			726,439
		1,070,317			1,082,050
	Held to maturity:
	Due in one year or less	26,530			26,552
	Due after one year through five years	255,068			256,567
	Due after five years through ten years	113,465			115,502
	Due after ten years	545,547			563,009
	Residential mortgage-backed securities	248,082			261,841
		1,188,692			1,223,471
	Total	$	2,259,009		$	2,305,521

Loans_Tables

Loans (Tables)	3 Months Ended
	Mar. 31, 2014																																Mar. 31, 2013
Receivables [Abstract]	'																																'
Schedule of composition of loans	'																																'
	Loans consist of the following at (in thousands):
			March 31, 2014				December 31, 2013
	Commercial loans		$	1,267,398			$	1,281,377
	Commercial loans collateralized by assignment of lease payments		1,472,621				1,494,188
	Commercial real estate		1,623,509				1,647,700
	Residential real estate		309,137				314,440
	Construction real estate		132,997				141,253
	Indirect vehicle		266,044				262,632
	Home equity		258,120				268,289
	Other consumer loans		64,812				66,952
	Gross loans, excluding covered loans		5,394,638				5,476,831
	Covered loans		173,677				235,720
	Total loans (1)		$	5,568,315			$	5,712,551
	(1)          Gross loan balances at March 31, 2014 and December 31, 2013 are net of unearned income, including net deferred loan fees of $1.5 million and $1.9 million, respectively.
Contractual aging of the recorded investment in past due loans by class of loans	'																																'
	The following table presents the contractual aging of the recorded investment in past due loans by class of loans as of March 31, 2014 and December 31, 2013 (in thousands):
			Current				30-59 Days				60-89 Days				Loans Past Due			Total			Total
							Past Due				Past Due				90 Days or More			Past Due
	31-Mar-14
	Commercial		$	1,259,251			$	5,202			$	310			$	2,635		$	8,147		$	1,267,398
	Commercial collateralized by assignment of lease payments		1,466,054				5,848				14				705			6,567			1,472,621
	Commercial real estate
	Healthcare		213,723				—				—				—			—			213,723
	Industrial		366,168				146				2,820				3,250			6,216			372,384
	Multifamily		295,737				154				659				2,597			3,410			299,147
	Retail		345,090				—				—				7,720			7,720			352,810
	Office		147,312				—				1,604				1,975			3,579			150,891
	Other		231,022				575				1,323				1,634			3,532			234,554
	Residential real estate		298,478				887				1,660				8,112			10,659			309,137
	Construction real estate		130,322				—				—				2,675			2,675			132,997
	Indirect vehicle		263,885				1,622				350				187			2,159			266,044
	Home equity		247,218				2,641				371				7,890			10,902			258,120
	Other consumer		64,789				11				8				4			23			64,812
	Gross loans, excluding covered loans		5,329,049				17,086				9,119				39,384			65,589			5,394,638
	Covered loans		80,708				1,790				3,275				87,904			92,969			173,677
	Total loans (1)		$	5,409,757			$	18,876			$	12,394			$	127,288		$	158,558		$	5,568,315
	Nonperforming loan aging		$	72,372			$	6,831			$	6,427			$	33,140		$	46,398		$	118,770
	Non-covered loans related to FDIC transactions (2)		$	13,715			$	270			$	535			$	6,244		$	7,049		$	20,764
	December 31, 2013
	Commercial		$	1,273,302			$	5,952			$	626			$	1,497		$	8,075		$	1,281,377
	Commercial collateralized by assignment of lease payments		1,489,391				3,841				656				300			4,797			1,494,188
	Commercial real estate
	Healthcare		213,665				—				—				3,064			3,064			216,729
	Industrial		372,975				5,465				—				1,404			6,869			379,844
	Multifamily		302,456				3,078				181				2,226			5,485			307,941
	Retail		334,198				328				2,816				7,258			10,402			344,600
	Office		155,936				—				—				2,066			2,066			158,002
	Other		233,464				4,898				259				1,963			7,120			240,584
	Residential real estate		302,362				1,422				1,030				9,626			12,078			314,440
	Construction real estate		138,563				391				—				2,299			2,690			141,253
	Indirect vehicle		259,488				2,210				657				277			3,144			262,632
	Home equity		257,219				1,725				2,165				7,180			11,070			268,289
	Other consumer		66,866				81				1				4			86			66,952
	Gross loans, excluding covered loans		5,399,885				29,391				8,391				39,164			76,946			5,476,831
	Covered loans		135,717				902				3,346				95,755			100,003			235,720
	Total loans (1)		$	5,535,602			$	30,293			$	11,737			$	134,919		$	176,949		$	5,712,551
	Nonperforming loan aging		$	56,339			$	14,325			$	3,283			$	32,614		$	50,222		$	106,561
	Non-covered loans related to FDIC transactions (2)		$	13,541			$	163			$	391			$	6,550		$	7,104		$	20,645
	(1)          Includes loans related to the InBank FDIC-assisted transaction completed by MB Financial Bank in 2009.
	(2)          Loans related to the InBank FDIC-assisted transaction completed by MB Financial Bank in 2009.
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing by class of loans	'																																'
	The following table presents the recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing by class of loans as of March 31, 2014 and December 31, 2013 (in thousands):
			March 31, 2014								December 31, 2013
							Loans past due								Loans past due
			Nonaccrual				90 days or more				Nonaccrual				90 days or more
							and still accruing								and still accruing
	Commercial		$	38,407			$	—			$	17,781			$	—
	Commercial collateralized by assignment of lease payments		3,420				705				4,276				291
	Commercial real estate:
	Healthcare		—				—				3,064				—
	Industrial		14,419				—				15,265				155
	Multifamily		7,674				—				5,145				—
	Office		7,245				—				11,703				—
	Retail		4,457				—				2,969				—
	Other		15,704				42				19,991				—
	Residential real estate		11,945				—				13,009				—
	Construction real estate		782				—				475				—
	Indirect vehicle		1,484				—				1,459				—
	Home equity		12,476				—				10,969				—
	Other consumer		10				—				9				—
	Total		$	118,023			$	747			$	106,115			$	446
Risk category of loans by class of loans	'																																'
	The following tables present the risk category of loans by class of loans based on the most recent analysis performed as of March 31, 2014 and December 31, 2013 (in thousands):
			Pass				Special				Substandard				Doubtful			Total
							Mention
	31-Mar-14
	Commercial		$	1,172,539			$	35,654			$	59,205			$	—		$	1,267,398
	Commercial collateralized by assignment of lease payments		1,465,808				233				6,580				—			1,472,621
	Commercial real estate
	Healthcare		189,935				9,148				14,640				—			213,723
	Industrial		327,309				17,428				27,647				—			372,384
	Multifamily		289,110				338				9,699				—			299,147
	Retail		334,014				3,364				15,432				—			352,810
	Office		140,437				2,631				7,823				—			150,891
	Other		215,287				182				19,085				—			234,554
	Construction real estate		129,882				2,333				782				—			132,997
	Total		$	4,264,321			$	71,311			$	160,893			$	—		$	4,496,525
	December 31, 2013
	Commercial		$	1,193,114			$	26,637			$	61,000			$	626		$	1,281,377
	Commercial collateralized by assignment of lease payments		1,486,899				553				6,736				—			1,494,188
	Commercial real estate
	Healthcare		189,705				21,186				2,774				3,064			216,729
	Industrial		345,236				5,328				29,280				—			379,844
	Multifamily		296,179				342				11,420				—			307,941
	Retail		316,420				10,660				17,520				—			344,600
	Office		151,393				2,682				3,927				—			158,002
	Other		217,188				349				23,047				—			240,584
	Construction real estate		139,847				540				866				—			141,253
	Total		$	4,335,981			$	68,277			$	156,570			$	3,690		$	4,564,518
Recorded investment in loan classes based on payment activity	'																																'
	The following table presents the recorded investment in those loan classes based on payment activity as of March 31, 2014 and December 31, 2013 (in thousands):
			Performing				Non-performing				Total
	31-Mar-14
	Residential real estate		$	297,192			$	11,945			$	309,137
	Indirect vehicle		264,560				1,484				266,044
	Home equity		245,644				12,476				258,120
	Other consumer		64,802				10				64,812
	Total		$	872,198			$	25,915			$	898,113
	December 31, 2013
	Residential real estate		$	301,431			$	13,009			$	314,440
	Indirect vehicle		261,173				1,459				262,632
	Home equity		257,320				10,969				268,289
	Other consumer		66,943				9				66,952
	Total		$	886,867			$	25,446			$	912,313
Loans individually evaluated for impairment by class of loans	'																																'
	The following tables present loans individually evaluated for impairment by class of loans as of March 31, 2014 and December 31, 2013 (in thousands):
			31-Mar-14
																		Three Months Ended
			Unpaid				Recorded				Partial				Allowance for			Average			Interest
			Principal				Investment				Charge-offs				Loan Losses			Recorded			Income
			Balance												Allocated			Investment			Recognized
	With no related allowance recorded:
	Commercial		$	9,508			$	9,508			$	—			$	—		$	9,928		$	—
	Commercial collateralized by assignment of lease payments		3,009				3,009				—				—			3,044			21
	Commercial real estate:
	Healthcare		—				—				—				—			—			—
	Industrial		12,457				9,430				3,027				—			11,565			—
	Multifamily		1,849				1,849				—				—			1,085			31
	Retail		7,036				5,065				1,971				—			6,955			—
	Office		735				527				208				—			768			—
	Other		2,116				2,075				41				—			2,202			—
	Residential real estate		4,151				4,151				—				—			4,145			—
	Construction real estate		375				375				—				—			137			—
	Indirect vehicle		—				—				—				—			—			—
	Home equity		1,327				1,105				222				—			1,327			—
	Other consumer		—				—				—				—			—			—
	With an allowance recorded:
	Commercial		31,683				31,683				—				6,160			13,679			—
	Commercial collateralized by assignment of lease payments		1,226				1,226				—				174			919			22
	Commercial real estate:
	Healthcare		—				—				—				—			—			—
	Industrial		7,461				7,159				302				318			4,565			—
	Multifamily		7,765				6,519				1,246				1,748			6,307			70
	Retail		9,086				7,345				1,741				556			7,259			—
	Office		4,294				3,930				364				1,260			3,246			—
	Other		14,146				14,061				85				269			14,290			4
	Residential real estate		15,028				14,000				1,028				3,076			14,645			—
	Construction real estate		2,796				407				2,389				195			527			—
	Indirect vehicle		269				183				86				25			300			—
	Home equity		24,244				23,705				539				1,395			24,538			—
	Other consumer		—				—				—				—			—			—
	Total		$	160,561			$	147,312			$	13,249			$	15,176		$	131,431		$	148
			December 31, 2013
			Unpaid				Recorded				Partial				Allowance for			Average			Interest
			Principal				Investment				Charge-offs				Loan Losses			Recorded			Income
			Balance												Allocated			Investment			Recognized
	With no related allowance recorded:
	Commercial		$	8,903			$	8,903			$	—			$	—		$	8,259		$	—
	Commercial collateralized by assignment of lease payments		3,401				3,401				—				—			1,030			6
	Commercial real estate:
	Healthcare		—				—				—				—			2,698			—
	Industrial		7,560				7,560				—				—			8,900			—
	Multifamily		1,166				1,166				—				—			758			11
	Retail		4,466				4,466				—				—			3,628			—
	Office		559				527				32				—			922			—
	Other		2,963				2,963				—				—			4,380			—
	Residential real estate		4,234				4,234				—				—			3,260			—
	Construction real estate		—				—				—				—			—			—
	Indirect vehicle		—				—				—				—			—			—
	Home equity		577				577				—				—			797			—
	Other consumer		—				—				—				—			—			—
	With an allowance recorded:
	Commercial		8,923				8,919				4				4,284			13,476			4
	Commercial collateralized by assignment of lease payments		1,060				1,060				—				144			1,279			192
	Commercial real estate:
	Healthcare		3,186				3,064				122				382			8,189			—
	Industrial		7,707				7,705				2				3,038			3,699			—
	Multifamily		5,374				5,374				—				1,661			6,443			340
Retail		14,169				12,428				1,741				1,511			12,885			280
Office		2,442				2,442				—				791			4,045			—
Other		20,367				17,029				3,338				796			12,868			20
Residential real estate		13,496				12,710				786				3,119			12,966			245
Construction real estate		475				475				—				227			1,603			—
Indirect vehicle		173				123				50				57			86			—
Home equity		23,840				23,395				445				1,358			24,283			772
Other consumer		—				—				—				—			—			—
Total		$	135,041			$	128,521			$	6,520			$	17,368		$	136,454		$	1,870
Schedule of loans that have been restructured classified as performing and non-performing	'																																'
	The following table presents loans that have been restructured during the three months ended March 31, 2014 (dollars in thousands):																																The following table presents loans that have been restructured during the three months ended March 31, 2013 (dollars in thousands):
			31-Mar-14																															31-Mar-13
			Number of		Pre-Modification Recorded				Post-Modification Recorded				Charge-offs and																					Number of	Pre-Modification Recorded		Post-Modification Recorded		Charge-offs and
			Loans		Investment				Investment				Specific Reserves																					Loans	Investment		Investment		Specific Reserves
	Performing:																																Performing:
	Indirect vehicle		1		$	5			$	5			$	—																			Residential real estate	3	$	479	$	479	$	—
	Home equity		3		1,039				1,039				—																				Home equity	5	548		548		—
	Total		4		$	1,044			$	1,044			$	—																			Total	8	$	1,027	$	1,027	$	—
	Non-Performing:																																Non-Performing:
	Residential real estate		4		$	1,439			$	1,439			$	—																			Commercial	1	$	42	$	42	$	13
	Indirect vehicle		18		108				108				—																				Commercial real estate:
	Home equity		4		532				532				—																				Multifamily	1	187		187		50
	Total		26		$	2,079			$	2,079			$	—																			Retail	2	657		657		179
																																	Other	1	84		84		23
																																	Residential real estate	4	331		331		—
																																	Home equity	16	2,105		2,105		—
																																	Total	25	$	3,406	$	3,406	$	265
Troubled debt restructuring activity rollforward	'																																'
	The following tables present the troubled debt restructurings activity during the three months ended March 31, 2014 (in thousands):
			Performing				Non-performing
	Beginning balance		$	29,430			$	24,952
	Additions		1,044				2,079
	Charge-offs		(162		)		(1,573		)
	Principal payments, net		(319		)		(2,386		)
	Removals		(8,573		)		(3,139		)
	Transfer to other real estate owned		—				—
	Transfer from/to performing		4,792				415
	Transfer from/to nonperforming		(415		)		(4,792		)
	Ending balance		$	25,797			$	15,556
Type of financing receivable modifications and restructuring	'																																'
	The following table presents the type of modification for loans that have been restructured during the three months ended March 31, 2014 (in thousands):
		31-Mar-14
		Extended				Extended
		Maturity,				Maturity and				Delay in
		Amortization				Delay in Payments				Payments or
		and Reduction				or Reduction of				Reduction of
		of Interest Rate				Interest Rate				Interest Rate				Total
	Residential real estate	$	—			$	1,269			$	170			$	1,439
	Indirect vehicle	—				—				113				113
	Home equity	68				1,209				294				1,571
	Total	$	68			$	2,478			$	577			$	3,123
Allowance activity for loan losses by portfolio segment based on impairment method	'																																'
	The following table presents the activity in the allowance for credit losses, balance in allowance for credit losses and recorded investment in loans by portfolio segment and based on impairment method as of March 31, 2014 and 2013 (in thousands):
			Commercial				Commercial				Commercial				Residential			Construction			Indirect		Home			Other consumer		Unfunded			Total
							collateralized  by				real estate				real estate			real estate			vehicle		equity					commitments
							assignment of
							lease payments
	31-Mar-14
	Allowance for credit losses:
	Beginning balance		$	23,461			$	9,159			$	51,628			$	8,872		$	6,856		$	1,662	$	8,478		$	1,630	$	1,716		$	113,462
	Charge-offs		90				—				7,156				265			56			920		619			495		—			9,601
	Recoveries		1,628				—				485				519			99			442		133			78		—			3,384
	Provision		(1,061		)		(101		)		2,583				(1,039		)	(415		)	500		405			351		(73		)	1,150
	Ending balance		$	23,938			$	9,058			$	47,540			$	8,087		$	6,484		$	1,684	$	8,397		$	1,564	$	1,643		$	108,395
	Ending allowance balance attributable to loans:
	Individually evaluated for impairment		$	6,160			$	174			$	4,151			$	3,076		$	195		$	25	$	1,395		$	—	$	665		$	15,841
	Collectively evaluated for impairment		17,312				8,884				41,707				5,011			6,229			1,659		7,002			1,564		978			90,346
	Acquired and accounted for under ASC 310-30 (1)		466				—				1,682				—			60			—		—			—		—			2,208
	Total ending allowance balance		$	23,938			$	9,058			$	47,540			$	8,087		$	6,484		$	1,684	$	8,397		$	1,564	$	1,643		$	108,395
	Loans:
	Individually evaluated for impairment		$	41,191			$	4,235			$	57,960			$	18,151		$	782		$	183	$	24,810		$	—	$	—		$	147,312
	Collectively evaluated for impairment		1,208,639				1,468,386				1,565,549				287,790			132,215			265,861		233,310			64,812		—			5,226,562
	Acquired and accounted for under ASC 310-30 (1)		30,976				—				95,506				5,121			36,752			—		110			25,976		—			194,441
	Total ending loans balance		$	1,280,806			$	1,472,621			$	1,719,015			$	311,062		$	169,749		$	266,044	$	258,230		$	90,788	$	—		$	5,568,315
	31-Mar-13
	Allowance for credit losses:
	Beginning balance		$	24,943			$	7,755			$	61,056			$	6,941		$	11,222		$	1,324	$	9,401		$	1,562	$	4,075		$	128,279
	Charge-offs		911				—				1,917				962			82			729		787			565		—			5,953
	Recoveries		452				144				740				214			276			415		114			52		—			2,407
	Provision		(330		)		200				3,268				455			(2,246		)	389		(826		)	234		(1,144		)	—
	Ending balance		$	24,154			$	8,099			$	63,147			$	6,648		$	9,170		$	1,399	$	7,902		$	1,283	$	2,931		$	124,733
	Ending allowance balance attributable to loans:
	Individually evaluated for impairment		$	2,643			$	86			$	8,912			$	2,858		$	496		$	—	$	682		$	—	$	2,461		$	18,138
	Collectively evaluated for impairment		19,475				8,013				52,248				3,681			8,674			1,399		7,220			1,283		470			102,463
	Acquired and accounted for under ASC 310-30 (1)		2,036				—				1,987				109			—			—		—			—		—			4,132
	Total ending allowance balance		$	24,154			$	8,099			$	63,147			$	6,648		$	9,170		$	1,399	$	7,902		$	1,283	$	2,931		$	124,733
	Loans:
	Individually evaluated for impairment		$	21,134			$	536			$	59,435			$	14,791		$	2,160		$	—	$	25,058		$	—	$	—		$	123,114
	Collectively evaluated for impairment		1,168,907				1,347,130				1,683,894				294,145			99,421			220,739		266,132			81,932		—			5,162,300
	Acquired and accounted for under ASC 310-30 (1)		52,040				—				223,952				6,414			106,927			—		291			32,630		—			422,254
	Total ending loans balance		$	1,242,081			$	1,347,666			$	1,967,281			$	315,350		$	208,508		$	220,739	$	291,481		$	114,562	$	—		$	5,707,668
	(1)  Loans acquired in FDIC-assisted transactions and accounted for under ASC Subtopic 310-30 “Receivables — Loans and Debt Securities Acquired with Deteriorated Credit Quality.”
Changes in the accretable yield for purchased credit-impaired loans	'																																'
	Changes in the accretable yield for loans acquired in FDIC-assisted transactions and accounted for under ASC 310-30 were as follows for the three months ended March 31, 2014 and 2013 (in thousands):
			Three Months Ended
			March 31,
			2014				2013
	Balance at beginning of period		$	2,337			$	5,685
	Accretion		(550		)		(1,457		)
	Other		574				92
	Balance at end of period		$	2,361			$	4,320
Purchased loans disclosures	'																																'
	The carrying amount of covered loans and other purchased non-covered loans at March 31, 2014 consisted of loans as shown in the following table (in thousands):
	31-Mar-14		Purchased				Purchased Non-Impaired				Total
			Impaired				Loans
			Loans
	Covered loans:
	Commercial related (1)		$	5,660			$	5,670			$	11,330
	Commercial		666				1,411				2,077
	Commercial real estate		50,176				45,330				95,506
	Construction real estate		31,030				5,723				36,753
	Other		2,533				25,478				28,011
	Total covered loans		$	90,065			$	83,612			$	173,677
	Estimated (payable) receivable amount from the FDIC under the loss-share agreement (2)		$	(1,755	)		$	9,024			$	7,269
	Non-covered loans:
	Commercial related (3)		$	4,823			$	12,745			$	17,568
	Other		89				3,107				3,196
	Total non-covered loans		$	4,912			$	15,852			$	20,764
	-1	Covered commercial related loans include commercial, commercial real estate and construction real estate loans acquired in connection with the Heritage and Benchmark FDIC-assisted transactions.
	-2	Estimated reimbursable amounts from the FDIC under the loss-share agreement exclude $786 thousand in reimbursable amounts related to covered other real estate owned.
	-3	Non-covered commercial related loans include commercial, commercial real estate and construction real estate for InBank.

Goodwill_and_Intangibles_Table

Goodwill and Intangibles (Tables)	3 Months Ended
	Mar. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Changes in the carrying amount of core deposit and client relationship intangibles	'
	The following table presents the changes in the carrying amount of core deposit and client relationship intangibles, gross carrying amount, accumulated amortization, and net book value as of March 31, 2014 (in thousands):
		Three Months Ended
		March 31,
		2014
	Balance at beginning of period	$	23,428
	Amortization expense	(1,240		)
	Balance at end of period	$	22,188
	Gross carrying amount	$	54,368
	Accumulated amortization	(32,180		)
	Net book value	$	22,188
Estimated future amortization expense of other intangible assets	'
	The following presents the estimated future amortization expense of other intangible assets (in thousands):
	Year ending December 31,	Amount
	2014	$	3,508
	2015	4,030
	2016	3,418
	2017	3,071
	2018	2,812
	Thereafter	5,349
		$	22,188

Deposits_Tables

Deposits (Tables)	3 Months Ended
	Mar. 31, 2014
Deposits [Abstract]	'
Schedule of composition of deposits	'
	The composition of deposits was as follows (in thousands):
		March 31,		December 31,
		2014		2013
	Demand deposit accounts, noninterest bearing	$	2,435,868	$	2,375,863
	NOW and money market accounts	2,772,766		2,682,419
	Savings accounts	865,910		855,394
	Certificates of deposit, $100,000 or more	790,273		827,413
	Other certificates of deposit	620,930		640,170
	Total	$	7,485,747	$	7,381,259

ShortTerm_Borrowings_Tables

Short-Term Borrowings (Tables)	3 Months Ended
	Mar. 31, 2014
Short-term Debt [Abstract]	'
Summary of short-term borrowings	'
	Short-term borrowings were as follows as of March 31, 2014 and December 31, 2013 (dollars in thousands):
		31-Mar-14				December 31, 2013
		Weighted				Weighted
		Average				Average
		Cost		Amount		Cost		Amount
	Customer repurchase agreements	0.2	%	$	189,872	0.2	%	$	193,389
	Federal Home Loan Bank advances	—		—		0.17		300,000
		0.2	%	$	189,872	0.18	%	$	493,389

Junior_Subordinated_Notes_Issu1

Junior Subordinated Notes Issued to Capital Trusts (Tables)	3 Months Ended
	Mar. 31, 2014
JUNIOR SUBORDINATED NOTES ISSUED TO CAPITAL TRUSTS	'
Outstanding junior subordinated notes and the related trust preferred securities issued by each trust	'
	The table below summarizes the outstanding junior subordinated notes and the related trust preferred securities issued by each trust as of March 31, 2014 (in thousands):
			Coal City		MB Financial		MB Financial		MB Financial
			Capital Trust I		Capital Trust II		Capital Trust III		Capital Trust IV
	Junior Subordinated Notes:
	Principal balance		$	25,774	$	36,083	$	10,310	$	20,619
	Annual interest rate		3-mo LIBOR + 1.80%		3-mo LIBOR + 1.40%		3-mo LIBOR + 1.50%		3-mo LIBOR + 1.52%
	Stated maturity date		September 1, 2028		September 15, 2035		September 23, 2036		September 15, 2036
	Call date		September 1, 2008		December 15, 2010		September 23, 2011		September 15, 2011
	Trust Preferred Securities:
	Face Value		$	25,000	$	35,000	$	10,000	$	20,000
	Annual distribution rate		3-mo LIBOR + 1.80%		3-mo LIBOR + 1.40%		3-mo LIBOR + 1.50%		3-mo LIBOR + 1.52%
	Issuance date		July 1998		August 2005		July 2006		August 2006
	Distribution dates (1)		Quarterly		Quarterly		Quarterly		Quarterly
			MB Financial		MB Financial		FOBB
			Capital Trust V		Capital Trust VI		Statutory Trust III (2)
	Junior Subordinated Notes:
	Principal balance		$	30,928	$	23,196	$	5,155
	Annual interest rate		3-mo LIBOR + 1.30%		3-mo LIBOR + 1.30%		3-mo LIBOR + 2.80%
	Stated maturity date		December 15, 2037		October 30, 2037		January 23, 2034
	Call date		December 15, 2012		October 30, 2012		January 23, 2009
	Trust Preferred Securities:
	Face Value		$	30,000	$	22,500	$	5,000
	Annual distribution rate		3-mo LIBOR + 1.30%		3-mo LIBOR + 1.30%		3-mo LIBOR + 2.80%
	Issuance date		September 2007		October 2007		December 2003
	Distribution dates (1)		Quarterly		Quarterly		Quarterly
	-1	All distributions are cumulative and paid in cash.
	-2	FOBB Statutory Trust III was established by First Oak Brook Bancshares, Inc. (“FOBB”) prior to the Company's acquisition of FOBB, and the junior subordinated note issued by FOBB to FOBB Statutory Trust III was assumed by the Company upon completion of the acquisition.

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Schedule of outstanding financial instruments, contractual amounts of off-balance sheet credit risk	'
	At March 31, 2014 and December 31, 2013, the following financial instruments were outstanding, the contractual amounts of which represent off-balance sheet credit risk (in thousands):
		Contractual Amount
		March 31, 2014		December 31, 2013
	Commitments to extend credit:
	Home equity lines	$	206,193	$	208,581
	Other commitments	1,174,336		1,214,391
	Letters of credit:
	Standby	75,274		69,556
	Commercial	763		708

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2014
Fair Value Disclosures [Abstract]	'
Financial assets and financial liabilities measured at fair value on a recurring basis	'
	The following table summarizes financial assets and financial liabilities measured at fair value on a recurring basis as of March 31, 2014 and December 31, 2013, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value (in thousands):
			Total				Quoted Prices in				Significant Other				Significant
							Active Markets for				Observable Inputs				Unobservable Inputs
							Identical Assets				(Level 2)				(Level 3)
							(Level 1)
	31-Mar-14
	Financial assets
	Securities available for sale:
	U.S Government sponsored agencies and enterprises		$	51,836			$	—			$	51,836			$	—
	States and political subdivisions		19,350				—				19,350				—
	Residential mortgage-backed securities		673,515				—				672,864				651
	Commercial mortgage-backed securities		52,924				—				52,924				—
	Corporate bonds		273,853				—				269,005				4,848
	Equity securities		10,572				10,572				—				—
	Loans held for sale		802				—				802				—
	Assets held in trust for deferred compensation		11,451				11,451				—				—
	Derivative financial instruments		16,696				—				16,696				—
	Financial liabilities
	Other liabilities (1)		11,366				11,366				—				—
	Derivative financial instruments		16,600				—				16,600				—
	December 31, 2013
	Financial assets
	Securities available for sale:
	U.S. Government sponsored agencies and enterprises		$	52,068			$	—			$	52,068			$	—
	States and political subdivisions		19,143				—				19,143				—
	Residential mortgage-backed securities		701,233				—				700,542				691
	Commercial mortgage-backed securities		52,941				—				52,941				—
	Corporate bonds		283,070				—				277,905				5,165
	Equity securities		10,457				10,457				—				—
	Loans held for sale		629				—				629				—
	Assets held in trust for deferred compensation		10,679				10,679				—				—
	Derivative financial instruments		18,645				—				18,645				—
	Financial liabilities
	Other liabilities (1)		10,569				10,569				—				—
	Derivative financial instruments		18,632				—				18,632				—
	(1) Liabilities associated with assets held in trust for deferred compensation
Financial assets measured at fair value on a recurring and non-recurring basis, unobservable inputs used	'
	The following table presents additional information about the unobservable inputs used in the fair value measurement of financial assets measured on a recurring basis that were categorized within the Level 3 of the fair value hierarchy:
		Fair Value at			Valuation	Unobservable
		March 31, 2014			Technique	Input	Range
	Residential mortgage-backed securities	$	651		Discounted cash flows	Constant pre-payment rates
						(CPR) assumption	1% - 3% CPR
	Corporate bonds	4,848			Discounted cash flows	Credit assumption	20% Loss
	The following table presents additional information about the unobservable inputs used in the fair value measurement of financial assets measured on a nonrecurring basis that were categorized within the Level 3 of the fair value hierarchy:
		Fair Value at			Valuation	Unobservable
		March 31, 2014			Technique	Input	Range
	Impaired loans	$	99,923		Appraisal of collateral	Appraisal adjustments - sales costs	5% - 10%
	Foreclosed assets	44,382			Appraisal of collateral	Appraisal adjustments - sales costs	5% - 10%
Financial assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3)	'
	The following table presents additional information about financial assets measured at fair value on a recurring basis for which the Company used significant unobservable inputs (Level 3):
			Three Months Ended
			March 31,
	(in thousands)		2014				2013
	Balance, beginning of period		$	5,856			$	6,071
	Other comprehensive income		(179		)		(103		)
	Principal payments		(178		)		(40		)
	Balance, ending of period		$	5,499			$	5,928
Assets measured at fair value on a nonrecurring basis	'
	Assets measured at fair value on a nonrecurring basis as of March 31, 2014 and December 31, 2013 are included in the table below (in thousands):
			Total				Quoted Prices in Active				Significant Other				Significant
							Markets for Identical				Observable Inputs				Unobservable Inputs
							Assets (Level 1)				(Level 2)				(Level 3)
	31-Mar-14
	Financial assets:
	Impaired loans		$	99,923			$	—			$	—			$	99,923
	Non-financial assets:
	Foreclosed assets		44,382				—				—				44,382
	December 31, 2013
	Financial assets:
	Impaired loans		$	77,497			$	—			$	—			$	77,497
	Non-financial assets:
	Foreclosed assets		44,601				—				—				44,601
Estimated fair values of financial instruments	'
	The estimated fair values of financial instruments are as follows (in thousands):
			31-Mar-14
			Carrying Amount				Estimated Fair Value			Quoted Prices in Active			Significant Other			Significant
										Markets for Identical			Observable Inputs			Unobservable Inputs
										Assets (Level 1)			(Level 2)			(Level 3)
	Financial Assets:
	Cash and due from banks		$	268,803			$	268,803		$	268,803		$	—		$	—
	Federal funds sold		7,500				7,500			7,500			—			—
	Interest earning deposits with banks		244,819				244,819			244,819			—			—
	Investment securities available for sale		1,082,050				1,082,050			10,572			1,065,979			5,499
	Investment securities held to maturity		1,188,692				1,223,471			—			1,223,471			—
	Non-marketable securities - FHLB and FRB stock		51,432				51,432			—			—			51,432
	Loans held for sale		802				802			—			802			—
	Loans, net		5,461,563				5,418,234			—			—			5,418,234
	Accrued interest receivable		35,065				35,065			35,065			—			—
	Derivative financial instruments		16,696				16,696			—			16,696			—
	Financial Liabilities:
	Noninterest bearing deposits		$	2,435,868			$	2,435,868		$	2,435,868		$	—		$	—
	Interest bearing deposits		5,049,879				5,057,386			—			—			5,057,386
	Short-term borrowings		189,872				189,865			—			—			189,865
	Long-term borrowings		65,664				69,862			—			—			69,862
	Junior subordinated notes issued to capital trusts		152,065				102,577			—			—			102,577
	Accrued interest payable		2,014				2,014			2,014			—			—
	Derivative financial instruments		16,600				16,600			—			16,600			—
			December 31, 2013
			Carrying Amount				Estimated Fair Value			Quoted Prices in Active			Significant Other			Significant
										Markets for Identical			Observable Inputs			Unobservable Inputs
										Assets (Level 1)			(Level 2)			(Level 3)
	Financial Assets:
	Cash and due from banks		$	205,193			$	205,193		$	205,193		$	—		$	—
	Interest earning deposits with banks		268,266				268,266			268,266			—			—
	Federal funds sold		42,950				42,950			42,950			—			—
	Investment securities available for sale		1,118,912				1,118,912			10,457			1,102,599			5,856
	Investment securities held to maturity		1,182,533				1,198,929			—			1,198,929			—
	Non-marketable securities - FHLB and FRB stock		51,417				51,417			—			—			51,417
	Loans held for sale		629				629			—			629			—
	Loans, net		5,600,805				5,583,759			—			—			5,583,759
	Accrued interest receivable		36,593				36,593			36,593			—			—
	Derivative financial instruments		18,645				18,645			—			18,645			—
	Financial Liabilities:
	Non-interest bearing deposits		$	2,375,863			$	2,375,863		$	2,375,863		$	—		$	—
	Interest bearing deposits		5,005,396				5,012,928			—			—			5,012,928
	Short-term borrowings		493,389				493,384			—			—			493,384
	Long-term borrowings		62,159				66,301			—			—			66,301
	Junior subordinated notes issued to capital trusts		152,065				101,247			—			—			101,247
	Accrued interest payable		2,042				2,042			2,042			—			—
	Derivative financial instruments		18,632				18,632			—			18,632			—

Stock_Incentive_Plans_Tables

Stock Incentive Plans (Tables)	3 Months Ended
	Mar. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Summary of the impact of share-based payment plans in the financial statements	'
	The following table summarizes the impact of the Company’s share-based payment plans in the financial statements for the periods shown (in thousands):
		Three Months Ended
		March 31,
		2014				2013
	Total cost of share-based payment plans during the period	$	2,012			$	1,260
	Amount of related income tax benefit recognized in income	790				501
Additional information related to options outstanding	'
	The following table summarizes stock options outstanding for the three months ended March 31, 2014:
		Number of			Weighted			Weighted	Aggregate
		Options			Average			Average	Intrinsic
					Exercise			Remaining	Value
					Price			Contractual	(in thousands)
								Term
								(In Years)
	Options outstanding as of December 31, 2013	2,443,752			$	27.57
	Granted	187,403			29.87
	Exercised	(51,292	)		19.45
	Expired or cancelled	(17,800	)		31.23
	Forfeited	(13,082	)		21.22
	Options outstanding as of March 31, 2014	2,548,981			$	27.9		4.88	$	12,732
	Options exercisable as of March 31, 2014	1,708,542			$	30.24		3.22	$	6,180
Assumptions used for options granted	'
	The expected life of options is estimated based on historical employee behavior and represents the period of time that options granted are expected to remain outstanding.
	The following assumptions were used for options granted during the three months ended March 31, 2014:
		March 31, 2014
	Risk-free interest rate	1.89		%
	Expected volatility of Company’s stock	23.67		%
	Expected dividend yield	1.61		%
	Expected life of options	5.9 years
	Weighted average fair value per option of options granted during the year	$	6.31
Summary of changes in restricted shares	'
	The following is a summary of changes in restricted shares and units for the three months ended March 31, 2014:
		Number of			Weighted
		Shares and Units			Average
					Grant Date
					Fair Value
	Shares Outstanding at December 31, 2013	685,719			$	22.59
	Granted	256,951			30.59
	Vested	(33,575	)		21.44
	Forfeited	(6,274	)		22.9
	Shares Outstanding at March 31, 2014	902,821			$	24.91

Derivative_Financial_Instrumen1

Derivative Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Summary of derivative financial instruments	'
	The Company’s derivative financial instruments are summarized below as of March 31, 2014 and December 31, 2013 (in thousands):
		Asset Derivatives									Liability Derivatives
		31-Mar-14					December 31, 2013				31-Mar-14					December 31, 2013
		Notional		Estimated			Notional		Estimated		Notional		Estimated			Notional			Estimated
		Amount		Fair Value			Amount		Fair Value		Amount		Fair Value			Amount			Fair Value
	Derivative instruments designated as hedges of fair value:
	Interest rate swap contracts (1)	$	—	$	—		$	—	$	—	$	228	$	(21	)	$	238		$	(23	)
	Stand-alone derivative instruments (2)
	Interest rate swap contracts	563,291		15,500			550,883		17,298		564,210		(15,543		)	551,798			(17,350		)
	Interest rate options contracts	86,057		308			83,907		323		86,057		(308		)	84,953			(323		)
	Foreign exchange contracts	26,222		858			31,361		1,006		25,845		(726		)	47,760			(935		)
	Spot foreign exchange contracts	1,153		8			—		—		741		—			—			—
	Mortgage banking derivatives	1,573		22			1,783		18		594		(2		)	250			(1		)
	Total non-hedging derivative instruments	678,296		16,696			667,934		18,645		677,447		(16,579		)	684,761			(18,609		)
	Total	$	678,296	$	16,696		$	667,934	$	18,645	$	677,675	$	(16,600	)	$	684,999		$	(18,632	)
	(1) Hedged fixed-rate commercial real estate loans
	(2) These portfolio swaps are not designated as hedging instruments under ASC Topic 815.
Schedule of the amount of gains and losses on derivative contracts designated as hedges and not designated as hedges	'
	Amounts included in the other income in the consolidated statements of operations related to derivative financial instruments were as follows (in thousands):
		Three Months Ended
		March 31,
		2014		2013
	Derivative instruments designated as hedges of fair value:
	Interest rate swap contracts	$	—	$	(1	)
	Stand-alone derivative instruments:
	Interest rate swap contracts	9		11
	Interest rate options contracts	—		—
	Foreign exchange contracts	61		5
	Spot foreign exchange contracts	8		—
	Mortgage banking derivatives	3		(13		)
	Total non-hedging derivative instruments	81		3
	Total	$	81	$	2
Schedule of Derivative Instruments [Table Text Block]	'
		Financial Assets									Financial Liabilities
		Net Amount Recognized		Financial Instruments			Collateral		Net Amount		Net Amount Recognized		Financial Instruments			Collateral			Net Amount
	Derivatives:
	Counterparty A	$	883	$	(883	)	$	—	$	—	$	10,669	$	(883	)	$	(9,786	)	$	—
	Counterparty B	1,836		(412		)	—		1,424		412		(412		)	—			—
	Counterparty C	2,380		(1,612		)	—		768		1,612		(1,612		)	—			—
	Other counterparties	776		(5		)	—		771		60		(5		)	—			55
	Total derivatives	5,875		(2,912		)	—		2,963		12,753		(2,912		)	(9,786		)	55
	Repurchase agreements	—		—			—		—		193,389		—			(193,389		)	—
	Total	$	5,875	$	(2,912	)	$	—	$	2,963	$	206,142	$	(2,912	)	$	(203,175	)	$	55
		Financial Assets									Financial Liabilities
		Net Amount Recognized		Financial Instruments			Collateral		Net Amount		Net Amount Recognized		Financial Instruments			Collateral			Net Amount
	Derivatives:
	Counterparty A	$	389	$	(389	)	$	—	$	—	$	10,186	$	(388	)	$	(9,798	)	$	—
	Counterparty B	1,227		(810		)	—		417		810		(810		)	—			—
	Counterparty C	1,788		(1,631		)	—		157		1,631		(1,631		)	—			—
	Other counterparties	560		(7		)	—		553		25		(7		)	—			18
	Total derivatives	3,964		(2,837		)	—		1,127		12,652		(2,836		)	(9,798		)	18
	Repurchase agreements	—		—			—		—		189,872		—			(189,872		)	—
	Total	$	3,964	$	(2,837	)	$	—	$	1,127	$	202,524	$	(2,836	)	$	(199,670	)	$	18
	Information about the Company's financial instruments that are eligible for offset in the consolidated balance sheet as of December 31, 2013 is summarized below (in thousands):
		Financial Assets							Financial Liabilities
		Gross Amount Recognized		Gross Amount Offset			Net Amount Recognized		Gross Amount Recognized		Gross Amount Offset		Net Amount Recognized
	Derivatives:
	Interest rate swaps, caps and floors	$	5,792	$	—		$	5,792	$	11,904	$	—	$	11,904
	Foreign currency forward contracts	80		—			80		848		—		848
	Mortgage banking derivatives	3		—			3		1		—		1
	Total derivatives	5,875		—			5,875		12,753		—		12,753
	Repurchase agreements	—		—			—		193,389		—		193,389
	Total	$	5,875	$	—		$	5,875	$	206,142	$	—	$	206,142
	Information about the Company's financial instruments that are eligible for offset in the consolidated balance sheet as of March 31, 2014 is summarized below (in thousands):
		Financial Assets							Financial Liabilities
		Gross Amount Recognized		Gross Amount Offset			Net Amount Recognized		Gross Amount Recognized		Gross Amount Offset		Net Amount Recognized
	Derivatives:
	Interest rate swaps, caps and floors	$	3,896	$	—		$	3,896	$	11,976	$	—	$	11,976
	Foreign currency forward contracts	67		—			67		675		—		675
	Mortgage banking derivatives	1		—			1		1		—		1
	Total derivatives	3,964		—			3,964		12,652		—		12,652
	Repurchase agreements	—		—			—		189,872		—		189,872
	Total	$	3,964	$	—		$	3,964	$	202,524	$	—	$	202,524

Operating_Segments_Tables

Operating Segments (Tables)	3 Months Ended
	Mar. 31, 2013
Segment Reporting [Abstract]	'
Schedule of segment reporting information, by segment	'
	The following table presents summary financial information for the reportable segments (in thousands):
		Banking			Leasing		Consolidated
	Three months ended March 31, 2014
	Net interest income	$	65,119		$	2,209	$	67,328
	Provision for credit losses	1,080			70		1,150
	Non-interest income	24,258			12,354		36,612
	Non-interest expense	67,697			8,350		76,047
	Income tax expense	4,483			2,291		6,774
	Net income	$	16,117		$	3,852	$	19,969
	Total assets	$	8,968,195		$	469,108	$	9,437,303
	Three months ended March 31, 2013
	Net interest income	$	66,806		$	879	$	67,685
	Provision for credit losses	(47		)	47		—
	Non-interest income	22,909			15,794		38,703
	Non-interest expense	63,677			7,752		71,429
	Income tax expense	6,700			3,353		10,053
	Net income	$	19,385		$	5,521	$	24,906
	Total assets	$	9,025,700		$	360,130	$	9,385,830

Earnings_Per_Common_Share_Deta

Earnings Per Common Share (Details) (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Basic and diluted earnings per common share:	'	'
Net income (loss)	$19,969	$24,906
Earnings allocated to common stockholders	19,969	24,905
Weighted average shares outstanding for basic earnings per common share	54,639,951	54,411,806
Weighted average shares outstanding for diluted earnings per common share	55,265,188	54,736,644
Basic earnings per common share	$0.37	$0.46
Diluted earnings per common share	$0.36	$0.46
Common Stock	'	'
Basic and diluted earnings per common share:	'	'
Distributed earnings allocated to common stock	6,666	5,507
Undistributed earnings	13,303	19,399
Net income (loss)	19,969	24,906
Dilutive effect of equity awards	625,237	324,838
Participating Securities	'	'
Basic and diluted earnings per common share:	'	'
Less: earnings allocated to participating securities	$0	$1

Business_Combinations_Details

Business Combinations (Details) (USD $)	0 Months Ended
In Billions, except Share data, unless otherwise specified	Jul. 14, 2013	Mar. 31, 2014
Business Combinations [Abstract]	'	'
Business combination, assets to be acquired	'	$5.60
Business combination, loans to be acquired	'	3.7
Business combination, deposits to be acquired	'	$4
Business combination, share conversion	0.64318	'
Business combination, amount per share	$4.08	'

Investment_Securities_Details

Investment Securities (Details) (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Available for Sale	'	'
Amortized Cost	$1,070,317	$1,111,922
Gross Unrealized Gains	15,059	13,928
Gross Unrealized Losses	-3,326	-6,938
Fair Value	1,082,050	1,118,912
Held to Maturity	'	'
Investment securities held to maturity	1,188,692	1,182,533
Gross Unrealized Gains	36,245	20,762
Gross Unrealized Losses	-1,466	-4,366
Investment Securities held to maturity	1,223,471	1,198,929
Total Available for Sale and Held to Maturity Investment Securities	'	'
Amortized Cost	2,259,009	2,294,455
Gross Unrealized Gains	51,304	34,690
Gross Unrealized Losses	-4,792	-11,304
Fair Value	2,305,521	2,317,841
U.S. Government sponsored agencies and enterprises	'	'
Available for Sale	'	'
Amortized Cost	50,291	50,486
Gross Unrealized Gains	1,555	1,704
Gross Unrealized Losses	-10	-122
Fair Value	51,836	52,068
States and political subdivisions	'	'
Available for Sale	'	'
Amortized Cost	19,285	19,398
Gross Unrealized Gains	206	22
Gross Unrealized Losses	-141	-277
Fair Value	19,350	19,143
Held to Maturity	'	'
Investment securities held to maturity	940,610	932,955
Gross Unrealized Gains	22,486	7,584
Gross Unrealized Losses	-1,466	-4,366
Investment Securities held to maturity	961,630	936,173
Total Available for Sale and Held to Maturity Investment Securities	'	'
Percentage of securities consisting general obligation issues	90.00%	'
States and political subdivisions | State of Illinois	'	'
Total Available for Sale and Held to Maturity Investment Securities	'	'
Percentage of investments issued by states and political subdivisions that were within the state of Illinois	29.00%	'
Residential mortgage-backed securities	'	'
Available for Sale	'	'
Amortized Cost	666,707	696,415
Gross Unrealized Gains	8,268	8,555
Gross Unrealized Losses	-1,460	-3,737
Fair Value	673,515	701,233
Held to Maturity	'	'
Investment securities held to maturity	248,082	249,578
Gross Unrealized Gains	13,759	13,178
Gross Unrealized Losses	0	0
Investment Securities held to maturity	261,841	262,756
Commercial mortgage-backed securities	'	'
Available for Sale	'	'
Amortized Cost	50,841	50,891
Gross Unrealized Gains	2,083	2,050
Gross Unrealized Losses	0	0
Fair Value	52,924	52,941
Corporate bonds	'	'
Available for Sale	'	'
Amortized Cost	272,490	284,083
Gross Unrealized Gains	2,947	1,597
Gross Unrealized Losses	-1,584	-2,610
Fair Value	273,853	283,070
Equity securities	'	'
Available for Sale	'	'
Amortized Cost	10,703	10,649
Gross Unrealized Gains	0	0
Gross Unrealized Losses	-131	-192
Fair Value	$10,572	$10,457

Investment_Securities_Details_

Investment Securities (Details 2) (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
	Security_Position	Security_Position
Available for Sale	'	'
Less Than 12 Months, Fair Value	$226,833	$386,481
Less Than 12 Months, Unrealized Losses	-1,598	-5,991
12 Months or More, Fair Value	38,382	49,635
12 Months or More, Unrealized Losses	-1,728	-947
Total Fair Value	265,215	436,116
Total Unrealized Losses	-3,326	-6,938
Total	'	'
Less Than 12 Months, Fair Value	291,443	621,497
Less Than 12 Months, Unrealized Losses	-2,964	-10,321
12 Months or More, Fair Value	42,781	50,936
12 Months or More, Unrealized Losses	-1,828	-983
Total Fair Value	334,224	672,433
Total Unrealized Losses	-4,792	-11,304
Number of security positions in the investment portfolio in an unrealized loss position	151	345
U.S. Government sponsored agencies and enterprises	'	'
Available for Sale	'	'
Less Than 12 Months, Fair Value	18,660	18,598
Less Than 12 Months, Unrealized Losses	-10	-122
12 Months or More, Fair Value	0	0
12 Months or More, Unrealized Losses	0	0
Total Fair Value	18,660	18,598
Total Unrealized Losses	-10	-122
States and political subdivisions	'	'
Available for Sale	'	'
Less Than 12 Months, Fair Value	849	2,275
Less Than 12 Months, Unrealized Losses	-2	-166
12 Months or More, Fair Value	4,645	4,748
12 Months or More, Unrealized Losses	-139	-111
Total Fair Value	5,494	7,023
Total Unrealized Losses	-141	-277
Held to maturity	'	'
Less Than 12 Months, Fair Value	64,610	235,016
Less Than 12 Months, Unrealized Losses	-1,366	-4,330
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	4,399	1,301
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	-100	-36
Total Fair Value	69,009	236,317
Total Unrealized Losses	-1,466	-4,366
Residential mortgage-backed securities	'	'
Available for Sale	'	'
Less Than 12 Months, Fair Value	155,458	232,807
Less Than 12 Months, Unrealized Losses	-1,047	-2,905
12 Months or More, Fair Value	23,387	44,182
12 Months or More, Unrealized Losses	-413	-832
Total Fair Value	178,845	276,989
Total Unrealized Losses	-1,460	-3,737
Corporate bonds	'	'
Available for Sale	'	'
Less Than 12 Months, Fair Value	41,294	122,344
Less Than 12 Months, Unrealized Losses	-408	-2,606
12 Months or More, Fair Value	10,350	705
12 Months or More, Unrealized Losses	-1,176	-4
Total Fair Value	51,644	123,049
Total Unrealized Losses	-1,584	-2,610
Equity securities	'	'
Available for Sale	'	'
Less Than 12 Months, Fair Value	10,572	10,457
Less Than 12 Months, Unrealized Losses	-131	-192
12 Months or More, Fair Value	0	0
12 Months or More, Unrealized Losses	0	0
Total Fair Value	10,572	10,457
Total Unrealized Losses	($131)	($192)

Investment_Securities_Details_1

Investment Securities (Details 3) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Amortized cost and fair value of investment securities by contractual maturity	'	'	'
Realized gains	$318,000	$0	'
Realized losses	-1,000	-1,000	'
Net gains (losses)	317,000	-1,000	'
Amortized Cost, Available for sale	'	'	'
Due in one year or less	503,000	'	'
Due after one year through five years	325,427,000	'	'
Due after five years through ten years	7,657,000	'	'
Due after ten years	8,479,000	'	'
Amortized Cost	1,070,317,000	'	1,111,922,000
Fair Value, Available for sale	'	'	'
Due in one year or less	503,000	'	'
Due after one year through five years	328,517,000	'	'
Due after five years through ten years	7,735,000	'	'
Due after ten years	8,284,000	'	'
Fair Value	1,082,050,000	'	1,118,912,000
Amortized Cost, Held to maturity	'	'	'
Due in one year or less	26,530,000	'	'
Due in after one year through five years	255,068,000	'	'
Due after five years through ten years	113,465,000	'	'
Due after ten years	545,547,000	'	'
Investment securities held to maturity	1,188,692,000	'	1,182,533,000
Fair value, Held to maturity	'	'	'
Due in one year or less	26,552,000	'	'
Due in after one year through five years	256,567,000	'	'
Due after five years through ten years	115,502,000	'	'
Due after ten years	563,009,000	'	'
Investment Securities held to maturity	1,223,471,000	'	1,198,929,000
Total Available for Sale and Held to Maturity Investment Securities	'	'	'
Amortized Cost	2,259,009,000	'	2,294,455,000
Fair Value	2,305,521,000	'	2,317,841,000
Carrying amounts of investment securities available for sale pledged as collateral	918,500,000	'	908,400,000
Investment securities pledged as collateral for long-term Federal Home Loan Bank advances	23,600,000	'	29,000,000
Equity securities	'	'	'
Amortized Cost, Available for sale	'	'	'
Amortized Cost	10,703,000	'	10,649,000
Fair Value, Available for sale	'	'	'
Fair Value	10,572,000	'	10,457,000
Residential and commercial mortgage-backed securities	'	'	'
Amortized Cost, Available for sale	'	'	'
Amortized Cost	717,548,000	'	'
Fair Value, Available for sale	'	'	'
Fair Value	726,439,000	'	'
Residential mortgage-backed securities	'	'	'
Amortized Cost, Available for sale	'	'	'
Amortized Cost	666,707,000	'	696,415,000
Fair Value, Available for sale	'	'	'
Fair Value	673,515,000	'	701,233,000
Amortized Cost, Held to maturity	'	'	'
Investment securities held to maturity	248,082,000	'	249,578,000
Fair value, Held to maturity	'	'	'
Investment Securities held to maturity	$261,841,000	'	$262,756,000

Loans_Details

Loans (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
	investmentrating
Loans	'	'	'
Total loans, excluding covered loans	$5,394,638,000	$5,476,831,000	'
Covered loans	173,677,000	235,720,000	'
Loans and Leases Receivable, Net of Deferred Income Including Covered Loans	5,568,315,000	5,712,551,000	5,707,668,000
Net unearned income, including net deferred loan fees	1,500,000	1,900,000	'
Number of highest rating categories by rating services company	1	'	'
Number of highest rating categories to be achieved for classification as investment grade companies	4	'	'
Loans pledged as collateral for long-term Federal Home Loan Bank advances	7,300,000	518,400,000	'
Commercial loans	'	'	'
Loans	'	'	'
Total loans, excluding covered loans	1,267,398,000	1,281,377,000	'
Covered loans	2,077,000	'	'
Loans and Leases Receivable, Net of Deferred Income Including Covered Loans	1,280,806,000	'	1,242,081,000
Commercial loans collateralized by assignment of lease payments	'	'	'
Loans	'	'	'
Total loans, excluding covered loans	1,472,621,000	1,494,188,000	'
Loans and Leases Receivable, Net of Deferred Income Including Covered Loans	1,472,621,000	'	1,347,666,000
Commercial real estate	'	'	'
Loans	'	'	'
Total loans, excluding covered loans	1,623,509,000	1,647,700,000	'
Covered loans	95,506,000	'	'
Loans and Leases Receivable, Net of Deferred Income Including Covered Loans	1,719,015,000	'	1,967,281,000
Residential real estate	'	'	'
Loans	'	'	'
Total loans, excluding covered loans	309,137,000	314,440,000	'
Loans and Leases Receivable, Net of Deferred Income Including Covered Loans	311,062,000	'	315,350,000
Construction real estate	'	'	'
Loans	'	'	'
Total loans, excluding covered loans	132,997,000	141,253,000	'
Covered loans	36,753,000	'	'
Loans and Leases Receivable, Net of Deferred Income Including Covered Loans	169,749,000	'	208,508,000
Indirect vehicle	'	'	'
Loans	'	'	'
Total loans, excluding covered loans	266,044,000	262,632,000	'
Loans and Leases Receivable, Net of Deferred Income Including Covered Loans	266,044,000	'	220,739,000
Home equity lines	'	'	'
Loans	'	'	'
Total loans, excluding covered loans	258,120,000	268,289,000	'
Loans and Leases Receivable, Net of Deferred Income Including Covered Loans	258,230,000	'	291,481,000
Other consumer	'	'	'
Loans	'	'	'
Total loans, excluding covered loans	64,812,000	66,952,000	'
Loans and Leases Receivable, Net of Deferred Income Including Covered Loans	$90,788,000	'	$114,562,000
Minimum [Member]	'	'	'
Loans	'	'	'
Percentage of collateral pledge of first mortgage loans as per agreement	133.00%	'	'
Percentage of collateral pledge of home equity loans as per agreement	250.00%	'	'

Loans_Details_2

Loans (Details 2) (USD $)	3 Months Ended
	Mar. 31, 2014		Dec. 31, 2013		Mar. 31, 2013
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	$5,394,638,000		$5,476,831,000		'
Loans and Leases Receivable, Net of Deferred Income Including Covered Loans	5,568,315,000		5,712,551,000		5,707,668,000
Period past due of recorded investment in loans (in days)	'90 days		'		'
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing	'		'		'
Non-performing substandard and doubtful loans	92,100,000		80,700,000		'
Pass	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	4,264,321,000		4,335,981,000		'
Special Mention	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	71,311,000		68,277,000		'
Substandard	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	160,893,000		156,570,000		'
Doubtful	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	0		3,690,000		'
Total risk rated category	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	4,496,525,000		4,564,518,000		'
Non-performing	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Current	72,372,000		56,339,000		'
30-59 days, past due	6,831,000		14,325,000		'
60-89 days, past due	6,427,000		3,283,000		'
Loans past due, 90 days or more	33,140,000		32,614,000		'
Total, past due	46,398,000		50,222,000		'
Loans and Leases Receivable, Net of Deferred Income Including Covered Loans	118,770,000		106,561,000		'
Commercial loans	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Current	1,259,251,000		1,273,302,000		'
30-59 days, past due	5,202,000		5,952,000		'
60-89 days, past due	310,000		626,000		'
Loans past due, 90 days or more	2,635,000		1,497,000		'
Total, past due	8,147,000		8,075,000		'
Total loans, excluding covered loans	1,267,398,000		1,281,377,000		'
Loans and Leases Receivable, Net of Deferred Income Including Covered Loans	1,280,806,000		'		1,242,081,000
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing	'		'		'
Nonaccrual	38,407,000		17,781,000		'
Loans past due 90 days or more and still accruing	0		0		'
Commercial loans | Pass	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	1,172,539,000		1,193,114,000		'
Commercial loans | Special Mention	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	35,654,000		26,637,000		'
Commercial loans | Substandard	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	59,205,000		61,000,000		'
Commercial loans | Doubtful	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	0		626,000		'
Commercial loans | Total risk rated category	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	1,267,398,000		1,281,377,000		'
Commercial loans collateralized by assignment of lease payments	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Current	1,466,054,000		1,489,391,000		'
30-59 days, past due	5,848,000		3,841,000		'
60-89 days, past due	14,000		656,000		'
Loans past due, 90 days or more	705,000		300,000		'
Total, past due	6,567,000		4,797,000		'
Total loans, excluding covered loans	1,472,621,000		1,494,188,000		'
Loans and Leases Receivable, Net of Deferred Income Including Covered Loans	1,472,621,000		'		1,347,666,000
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing	'		'		'
Nonaccrual	3,420,000		4,276,000		'
Loans past due 90 days or more and still accruing	705,000		291,000		'
Commercial loans collateralized by assignment of lease payments | Pass	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	1,465,808,000		1,486,899,000		'
Commercial loans collateralized by assignment of lease payments | Special Mention	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	233,000		553,000		'
Commercial loans collateralized by assignment of lease payments | Substandard	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	6,580,000		6,736,000		'
Commercial loans collateralized by assignment of lease payments | Doubtful	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	0		0		'
Commercial loans collateralized by assignment of lease payments | Total risk rated category	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	1,472,621,000		1,494,188,000		'
Commercial real estate	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	1,623,509,000		1,647,700,000		'
Loans and Leases Receivable, Net of Deferred Income Including Covered Loans	1,719,015,000		'		1,967,281,000
Healthcare	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Current	213,723,000		213,665,000		'
30-59 days, past due	0		0		'
60-89 days, past due	0		0		'
Loans past due, 90 days or more	0		3,064,000		'
Total, past due	0		3,064,000		'
Total loans, excluding covered loans	213,723,000		216,729,000		'
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing	'		'		'
Nonaccrual	0		3,064,000		'
Loans past due 90 days or more and still accruing	0		0		'
Healthcare | Pass	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	189,935,000		189,705,000		'
Healthcare | Special Mention	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	9,148,000		21,186,000		'
Healthcare | Substandard	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	14,640,000		2,774,000		'
Healthcare | Doubtful	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	0		3,064,000		'
Healthcare | Total risk rated category	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	213,723,000		216,729,000		'
Industrial	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Current	366,168,000		372,975,000		'
30-59 days, past due	146,000		5,465,000		'
60-89 days, past due	2,820,000		0		'
Loans past due, 90 days or more	3,250,000		1,404,000		'
Total, past due	6,216,000		6,869,000		'
Total loans, excluding covered loans	372,384,000		379,844,000		'
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing	'		'		'
Nonaccrual	14,419,000		15,265,000		'
Loans past due 90 days or more and still accruing	0		155,000		'
Industrial | Pass	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	327,309,000		345,236,000		'
Industrial | Special Mention	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	17,428,000		5,328,000		'
Industrial | Substandard	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	27,647,000		29,280,000		'
Industrial | Doubtful	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	0		0		'
Industrial | Total risk rated category	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	372,384,000		379,844,000		'
Multifamily	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Current	295,737,000		302,456,000		'
30-59 days, past due	154,000		3,078,000		'
60-89 days, past due	659,000		181,000		'
Loans past due, 90 days or more	2,597,000		2,226,000		'
Total, past due	3,410,000		5,485,000		'
Total loans, excluding covered loans	299,147,000		307,941,000		'
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing	'		'		'
Nonaccrual	7,674,000		5,145,000		'
Loans past due 90 days or more and still accruing	0		0		'
Multifamily | Pass	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	289,110,000		296,179,000		'
Multifamily | Special Mention	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	338,000		342,000		'
Multifamily | Substandard	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	9,699,000		11,420,000		'
Multifamily | Doubtful	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	0		0		'
Multifamily | Total risk rated category	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	299,147,000		307,941,000		'
Retail	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Current	345,090,000		334,198,000		'
30-59 days, past due	0		328,000		'
60-89 days, past due	0		2,816,000		'
Loans past due, 90 days or more	7,720,000		7,258,000		'
Total, past due	7,720,000		10,402,000		'
Total loans, excluding covered loans	352,810,000		344,600,000		'
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing	'		'		'
Nonaccrual	4,457,000		2,969,000		'
Loans past due 90 days or more and still accruing	0		0		'
Retail | Pass	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	334,014,000		316,420,000		'
Retail | Special Mention	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	3,364,000		10,660,000		'
Retail | Substandard	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	15,432,000		17,520,000		'
Retail | Doubtful	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	0		0		'
Retail | Total risk rated category	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	352,810,000		344,600,000		'
Office	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Current	147,312,000		155,936,000		'
30-59 days, past due	0		0		'
60-89 days, past due	1,604,000		0		'
Loans past due, 90 days or more	1,975,000		2,066,000		'
Total, past due	3,579,000		2,066,000		'
Total loans, excluding covered loans	150,891,000		158,002,000		'
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing	'		'		'
Nonaccrual	7,245,000		11,703,000		'
Loans past due 90 days or more and still accruing	0		0		'
Office | Pass	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	140,437,000		151,393,000		'
Office | Special Mention	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	2,631,000		2,682,000		'
Office | Substandard	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	7,823,000		3,927,000		'
Office | Doubtful	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	0		0		'
Office | Total risk rated category	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	150,891,000		158,002,000		'
Other	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Current	231,022,000		233,464,000		'
30-59 days, past due	575,000		4,898,000		'
60-89 days, past due	1,323,000		259,000		'
Loans past due, 90 days or more	1,634,000		1,963,000		'
Total, past due	3,532,000		7,120,000		'
Total loans, excluding covered loans	234,554,000		240,584,000		'
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing	'		'		'
Nonaccrual	15,704,000		19,991,000		'
Loans past due 90 days or more and still accruing	42,000		0		'
Other | Pass	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	215,287,000		217,188,000		'
Other | Special Mention	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	182,000		349,000		'
Other | Substandard	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	19,085,000		23,047,000		'
Other | Doubtful	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	0		0		'
Other | Total risk rated category	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	234,554,000		240,584,000		'
Residential real estate	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Current	298,478,000		302,362,000		'
30-59 days, past due	887,000		1,422,000		'
60-89 days, past due	1,660,000		1,030,000		'
Loans past due, 90 days or more	8,112,000		9,626,000		'
Total, past due	10,659,000		12,078,000		'
Total loans, excluding covered loans	309,137,000		314,440,000		'
Loans and Leases Receivable, Net of Deferred Income Including Covered Loans	311,062,000		'		315,350,000
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing	'		'		'
Nonaccrual	11,945,000		13,009,000		'
Loans past due 90 days or more and still accruing	0		0		'
Residential real estate | Performing	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	297,192,000		301,431,000		'
Residential real estate | Non-performing	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	11,945,000		13,009,000		'
Construction real estate	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Current	130,322,000		138,563,000		'
30-59 days, past due	0		391,000		'
60-89 days, past due	0		0		'
Loans past due, 90 days or more	2,675,000		2,299,000		'
Total, past due	2,675,000		2,690,000		'
Total loans, excluding covered loans	132,997,000		141,253,000		'
Loans and Leases Receivable, Net of Deferred Income Including Covered Loans	169,749,000		'		208,508,000
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing	'		'		'
Nonaccrual	782,000		475,000		'
Loans past due 90 days or more and still accruing	0		0		'
Construction real estate | Pass	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	129,882,000		139,847,000		'
Construction real estate | Special Mention	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	2,333,000		540,000		'
Construction real estate | Substandard	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	782,000		866,000		'
Construction real estate | Doubtful	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	0		0		'
Construction real estate | Total risk rated category	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	132,997,000		141,253,000		'
Indirect vehicle	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Current	263,885,000		259,488,000		'
30-59 days, past due	1,622,000		2,210,000		'
60-89 days, past due	350,000		657,000		'
Loans past due, 90 days or more	187,000		277,000		'
Total, past due	2,159,000		3,144,000		'
Total loans, excluding covered loans	266,044,000		262,632,000		'
Loans and Leases Receivable, Net of Deferred Income Including Covered Loans	266,044,000		'		220,739,000
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing	'		'		'
Nonaccrual	1,484,000		1,459,000		'
Loans past due 90 days or more and still accruing	0		0		'
Indirect vehicle | Performing	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	264,560,000		261,173,000		'
Indirect vehicle | Non-performing	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	1,484,000		1,459,000		'
Home equity lines	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Current	247,218,000		257,219,000		'
30-59 days, past due	2,641,000		1,725,000		'
60-89 days, past due	371,000		2,165,000		'
Loans past due, 90 days or more	7,890,000		7,180,000		'
Total, past due	10,902,000		11,070,000		'
Total loans, excluding covered loans	258,120,000		268,289,000		'
Loans and Leases Receivable, Net of Deferred Income Including Covered Loans	258,230,000		'		291,481,000
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing	'		'		'
Nonaccrual	12,476,000		10,969,000		'
Loans past due 90 days or more and still accruing	0		0		'
Home equity lines | Performing	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	245,644,000		257,320,000		'
Home equity lines | Non-performing	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	12,476,000		10,969,000		'
Other consumer	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Current	64,789,000		66,866,000		'
30-59 days, past due	11,000		81,000		'
60-89 days, past due	8,000		1,000		'
Loans past due, 90 days or more	4,000		4,000		'
Total, past due	23,000		86,000		'
Total loans, excluding covered loans	64,812,000		66,952,000		'
Loans and Leases Receivable, Net of Deferred Income Including Covered Loans	90,788,000		'		114,562,000
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing	'		'		'
Nonaccrual	10,000		9,000		'
Loans past due 90 days or more and still accruing	0		0		'
Other consumer | Performing	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	64,802,000		66,943,000		'
Other consumer | Non-performing	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	10,000		9,000		'
Other loans	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	898,113,000		912,313,000		'
Other loans | Performing	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	872,198,000		886,867,000		'
Other loans | Non-performing	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Total loans, excluding covered loans	25,915,000		25,446,000		'
Gross loans, excluding covered loans	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Current	5,329,049,000		5,399,885,000		'
30-59 days, past due	17,086,000		29,391,000		'
60-89 days, past due	9,119,000		8,391,000		'
Loans past due, 90 days or more	39,384,000		39,164,000		'
Total, past due	65,589,000		76,946,000		'
Total loans, excluding covered loans	5,394,638,000		5,476,831,000		'
Covered loans	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Current	80,708,000		135,717,000		'
30-59 days, past due	1,790,000		902,000		'
60-89 days, past due	3,275,000		3,346,000		'
Loans past due, 90 days or more	87,904,000		95,755,000		'
Total, past due	92,969,000		100,003,000		'
Loans and Leases Receivable, Net of Deferred Income Including Covered Loans	173,677,000		235,720,000		'
Loans	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Current	5,409,757,000		5,535,602,000		'
30-59 days, past due	18,876,000		30,293,000		'
60-89 days, past due	12,394,000		11,737,000		'
Loans past due, 90 days or more	127,288,000		134,919,000		'
Total, past due	158,558,000		176,949,000		'
Loans and Leases Receivable, Net of Deferred Income Including Covered Loans	5,568,315,000		5,712,551,000		'
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing	'		'		'
Nonaccrual	118,023,000		106,115,000		'
Loans past due 90 days or more and still accruing	747,000		446,000		'
Non-covered loans related to FDIC transactions	'		'		'
Contractual aging of the recorded investment in loans	'		'		'
Current	13,715,000	[1]	13,541,000	[1]	'
30-59 days, past due	270,000	[1]	163,000	[1]	'
60-89 days, past due	535,000	[1]	391,000	[1]	'
Loans past due, 90 days or more	6,244,000	[1]	6,550,000	[1]	'
Total, past due	7,049,000		7,104,000		'
Loans and Leases Receivable, Net of Deferred Income Including Covered Loans	$20,764,000		$20,645,000		'
[1]	Loans related to the InBank FDIC-assisted transaction completed by MB Financial Bank in 2009.

Loans_Details_3

Loans (Details 3) (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Loans individually evaluated for impairment by class of loans	'	'
Unpaid Principal Balance	$160,561	$135,041
Recorded Investment	147,312	128,521
Partial Charge-Offs	13,249	6,520
Allowance for Loan Losses Allocated	15,176	17,368
Impaired Financing Receivable, Average Recorded Investment	131,431	136,454
Interest Income Recognized	148	1,870
Restructured loans	3,123	'
Residential real estate	'	'
Loans individually evaluated for impairment by class of loans	'	'
Restructured loans	1,439	'
Indirect vehicle	'	'
Loans individually evaluated for impairment by class of loans	'	'
Restructured loans	113	'
Home equity lines	'	'
Loans individually evaluated for impairment by class of loans	'	'
Restructured loans	1,571	'
Impaired financing receivable with no allowance | Commercial loans	'	'
Loans individually evaluated for impairment by class of loans	'	'
Unpaid Principal Balance	9,508	8,903
Recorded Investment	9,508	8,903
Partial Charge-Offs	0	0
Allowance for Loan Losses Allocated	0	0
Impaired Financing Receivable, Average Recorded Investment	9,928	8,259
Interest Income Recognized	0	0
Impaired financing receivable with no allowance | Commercial loans collateralized by assignment of lease payments	'	'
Loans individually evaluated for impairment by class of loans	'	'
Unpaid Principal Balance	3,009	3,401
Recorded Investment	3,009	3,401
Partial Charge-Offs	0	0
Allowance for Loan Losses Allocated	0	0
Impaired Financing Receivable, Average Recorded Investment	3,044	1,030
Interest Income Recognized	21	6
Impaired financing receivable with no allowance | Healthcare	'	'
Loans individually evaluated for impairment by class of loans	'	'
Unpaid Principal Balance	0	0
Recorded Investment	0	0
Partial Charge-Offs	0	0
Allowance for Loan Losses Allocated	0	0
Impaired Financing Receivable, Average Recorded Investment	0	2,698
Interest Income Recognized	0	0
Impaired financing receivable with no allowance | Industrial	'	'
Loans individually evaluated for impairment by class of loans	'	'
Unpaid Principal Balance	12,457	7,560
Recorded Investment	9,430	7,560
Partial Charge-Offs	3,027	0
Allowance for Loan Losses Allocated	0	0
Impaired Financing Receivable, Average Recorded Investment	11,565	8,900
Interest Income Recognized	0	0
Impaired financing receivable with no allowance | Multifamily	'	'
Loans individually evaluated for impairment by class of loans	'	'
Unpaid Principal Balance	1,849	1,166
Recorded Investment	1,849	1,166
Partial Charge-Offs	0	0
Allowance for Loan Losses Allocated	0	0
Impaired Financing Receivable, Average Recorded Investment	1,085	758
Interest Income Recognized	31	11
Impaired financing receivable with no allowance | Retail	'	'
Loans individually evaluated for impairment by class of loans	'	'
Unpaid Principal Balance	7,036	4,466
Recorded Investment	5,065	4,466
Partial Charge-Offs	1,971	0
Allowance for Loan Losses Allocated	0	0
Impaired Financing Receivable, Average Recorded Investment	6,955	3,628
Interest Income Recognized	0	0
Impaired financing receivable with no allowance | Office	'	'
Loans individually evaluated for impairment by class of loans	'	'
Unpaid Principal Balance	735	559
Recorded Investment	527	527
Partial Charge-Offs	208	32
Allowance for Loan Losses Allocated	0	0
Impaired Financing Receivable, Average Recorded Investment	768	922
Interest Income Recognized	0	0
Impaired financing receivable with no allowance | Other	'	'
Loans individually evaluated for impairment by class of loans	'	'
Unpaid Principal Balance	2,116	2,963
Recorded Investment	2,075	2,963
Partial Charge-Offs	41	0
Allowance for Loan Losses Allocated	0	0
Impaired Financing Receivable, Average Recorded Investment	2,202	4,380
Interest Income Recognized	0	0
Impaired financing receivable with no allowance | Residential real estate	'	'
Loans individually evaluated for impairment by class of loans	'	'
Unpaid Principal Balance	4,151	4,234
Recorded Investment	4,151	4,234
Partial Charge-Offs	0	0
Allowance for Loan Losses Allocated	0	0
Impaired Financing Receivable, Average Recorded Investment	4,145	3,260
Interest Income Recognized	0	0
Impaired financing receivable with no allowance | Construction real estate	'	'
Loans individually evaluated for impairment by class of loans	'	'
Unpaid Principal Balance	375	0
Recorded Investment	375	0
Partial Charge-Offs	0	0
Allowance for Loan Losses Allocated	0	0
Impaired Financing Receivable, Average Recorded Investment	137	0
Interest Income Recognized	0	0
Impaired financing receivable with no allowance | Indirect vehicle	'	'
Loans individually evaluated for impairment by class of loans	'	'
Unpaid Principal Balance	0	0
Recorded Investment	0	0
Partial Charge-Offs	0	0
Allowance for Loan Losses Allocated	0	0
Impaired Financing Receivable, Average Recorded Investment	0	0
Interest Income Recognized	0	0
Impaired financing receivable with no allowance | Home equity lines	'	'
Loans individually evaluated for impairment by class of loans	'	'
Unpaid Principal Balance	1,327	577
Recorded Investment	1,105	577
Partial Charge-Offs	222	0
Allowance for Loan Losses Allocated	0	0
Impaired Financing Receivable, Average Recorded Investment	1,327	797
Interest Income Recognized	0	0
Impaired financing receivable with no allowance | Other consumer	'	'
Loans individually evaluated for impairment by class of loans	'	'
Unpaid Principal Balance	0	0
Recorded Investment	0	0
Partial Charge-Offs	0	0
Allowance for Loan Losses Allocated	0	0
Impaired Financing Receivable, Average Recorded Investment	0	0
Interest Income Recognized	0	0
Impaired financing receivable with allowance | Commercial loans	'	'
Loans individually evaluated for impairment by class of loans	'	'
Unpaid Principal Balance	31,683	8,923
Recorded Investment	31,683	8,919
Partial Charge-Offs	0	4
Allowance for Loan Losses Allocated	6,160	4,284
Impaired Financing Receivable, Average Recorded Investment	13,679	13,476
Interest Income Recognized	0	4
Impaired financing receivable with allowance | Commercial loans collateralized by assignment of lease payments	'	'
Loans individually evaluated for impairment by class of loans	'	'
Unpaid Principal Balance	1,226	1,060
Recorded Investment	1,226	1,060
Partial Charge-Offs	0	0
Allowance for Loan Losses Allocated	174	144
Impaired Financing Receivable, Average Recorded Investment	919	1,279
Interest Income Recognized	22	192
Impaired financing receivable with allowance | Healthcare	'	'
Loans individually evaluated for impairment by class of loans	'	'
Unpaid Principal Balance	0	3,186
Recorded Investment	0	3,064
Partial Charge-Offs	0	122
Allowance for Loan Losses Allocated	0	382
Impaired Financing Receivable, Average Recorded Investment	0	8,189
Interest Income Recognized	0	0
Impaired financing receivable with allowance | Industrial	'	'
Loans individually evaluated for impairment by class of loans	'	'
Unpaid Principal Balance	7,461	7,707
Recorded Investment	7,159	7,705
Partial Charge-Offs	302	2
Allowance for Loan Losses Allocated	318	3,038
Impaired Financing Receivable, Average Recorded Investment	4,565	3,699
Interest Income Recognized	0	0
Impaired financing receivable with allowance | Multifamily	'	'
Loans individually evaluated for impairment by class of loans	'	'
Unpaid Principal Balance	7,765	5,374
Recorded Investment	6,519	5,374
Partial Charge-Offs	1,246	0
Allowance for Loan Losses Allocated	1,748	1,661
Impaired Financing Receivable, Average Recorded Investment	6,307	6,443
Interest Income Recognized	70	340
Impaired financing receivable with allowance | Retail	'	'
Loans individually evaluated for impairment by class of loans	'	'
Unpaid Principal Balance	9,086	14,169
Recorded Investment	7,345	12,428
Partial Charge-Offs	1,741	1,741
Allowance for Loan Losses Allocated	556	1,511
Impaired Financing Receivable, Average Recorded Investment	7,259	12,885
Interest Income Recognized	0	280
Impaired financing receivable with allowance | Office	'	'
Loans individually evaluated for impairment by class of loans	'	'
Unpaid Principal Balance	4,294	2,442
Recorded Investment	3,930	2,442
Partial Charge-Offs	364	0
Allowance for Loan Losses Allocated	1,260	791
Impaired Financing Receivable, Average Recorded Investment	3,246	4,045
Interest Income Recognized	0	0
Impaired financing receivable with allowance | Other	'	'
Loans individually evaluated for impairment by class of loans	'	'
Unpaid Principal Balance	14,146	20,367
Recorded Investment	14,061	17,029
Partial Charge-Offs	85	3,338
Allowance for Loan Losses Allocated	269	796
Impaired Financing Receivable, Average Recorded Investment	14,290	12,868
Interest Income Recognized	4	20
Impaired financing receivable with allowance | Residential real estate	'	'
Loans individually evaluated for impairment by class of loans	'	'
Unpaid Principal Balance	15,028	13,496
Recorded Investment	14,000	12,710
Partial Charge-Offs	1,028	786
Allowance for Loan Losses Allocated	3,076	3,119
Impaired Financing Receivable, Average Recorded Investment	14,645	12,966
Interest Income Recognized	0	245
Impaired financing receivable with allowance | Construction real estate	'	'
Loans individually evaluated for impairment by class of loans	'	'
Unpaid Principal Balance	2,796	475
Recorded Investment	407	475
Partial Charge-Offs	2,389	0
Allowance for Loan Losses Allocated	195	227
Impaired Financing Receivable, Average Recorded Investment	527	1,603
Interest Income Recognized	0	0
Impaired financing receivable with allowance | Indirect vehicle	'	'
Loans individually evaluated for impairment by class of loans	'	'
Unpaid Principal Balance	269	173
Recorded Investment	183	123
Partial Charge-Offs	86	50
Allowance for Loan Losses Allocated	25	57
Impaired Financing Receivable, Average Recorded Investment	300	86
Interest Income Recognized	0	0
Impaired financing receivable with allowance | Home equity lines	'	'
Loans individually evaluated for impairment by class of loans	'	'
Unpaid Principal Balance	24,244	23,840
Recorded Investment	23,705	23,395
Partial Charge-Offs	539	445
Allowance for Loan Losses Allocated	1,395	1,358
Impaired Financing Receivable, Average Recorded Investment	24,538	24,283
Interest Income Recognized	0	772
Impaired financing receivable with allowance | Other consumer	'	'
Loans individually evaluated for impairment by class of loans	'	'
Unpaid Principal Balance	0	0
Recorded Investment	0	0
Partial Charge-Offs	0	0
Allowance for Loan Losses Allocated	0	0
Impaired Financing Receivable, Average Recorded Investment	0	0
Interest Income Recognized	0	0
Performing	'	'
Loans individually evaluated for impairment by class of loans	'	'
Restructured loans	25,800	29,400
Non-performing	'	'
Loans individually evaluated for impairment by class of loans	'	'
Restructured loans	$15,600	$25,000

Loans_Details_4

Loans (Details 4) (USD $)

3 Months Ended

3 Months Ended

3 Months Ended

3 Months Ended

3 Months Ended

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Mar. 31, 2013

Mar. 31, 2014

Mar. 31, 2013

Mar. 31, 2013

Mar. 31, 2013

Mar. 31, 2013

Mar. 31, 2013

Mar. 31, 2014

Mar. 31, 2013

Mar. 31, 2014

Mar. 31, 2013

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2013

Mar. 31, 2014

Mar. 31, 2013

note

loan

Performing

Performing

Non-performing

Non-performing

Commercial loans

Multifamily

Retail

Other

Residential real estate

Residential real estate

Residential real estate

Residential real estate

Indirect vehicle

Indirect vehicle

Indirect vehicle

Home equity lines

Home equity lines

Home equity lines

Home equity lines

Home equity lines

loan

loan

loan

loan

loan

Non-performing

Non-performing

Non-performing

Non-performing

Performing

Non-performing

Non-performing

Performing

Non-performing

Performing

Performing

Non-performing

Non-performing

loan

loan

loan

loan

loan

loan

loan

loan

loan

loan

loan

loan

loan

Restructured loans

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of separate notes restructured into A/B by the company

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Minimum period of sustained repayment required to return the note to accrual status (in months)

'6 months

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Restructured loans representing A/B structures

$1,100,000

$1,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of A/B structures represented by restructured loans

1

1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of loans

'

'

4

8

26

25

1

1

2

1

'

3

4

4

'

1

18

'

3

5

4

16

Pre-Modification Recorded Investment

'

'

1,044,000

1,027,000

2,079,000

3,406,000

42,000

187,000

657,000

84,000

'

479,000

1,439,000

331,000

'

5,000

108,000

'

1,039,000

548,000

532,000

2,105,000

Post-Modification Recorded Investment

'

'

1,044,000

1,027,000

2,079,000

3,406,000

42,000

187,000

657,000

84,000

'

479,000

1,439,000

331,000

'

5,000

108,000

'

1,039,000

548,000

532,000

2,105,000

Charge-offs and Specific Reserves

'

'

0

0

0

265,000

13,000

50,000

179,000

23,000

'

0

0

0

'

0

0

'

0

0

0

0

Redefaulted loans

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Period past due of recorded redefaulted loans (in days)

'90 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Troubled Debt Restructuring Activity [Roll Forward]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Beginning balance

'

'

29,430,000

'

24,952,000

'

'

'

'

'

1,439,000

'

'

'

113,000

'

'

1,571,000

'

'

'

'

Additions

'

'

1,044,000

'

2,079,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Charge-offs

'

'

-162,000

'

-1,573,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Principal payments, net

'

'

-319,000

'

-2,386,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Removals

'

'

-8,573,000

'

-3,139,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Transfer to other real estate owned

'

'

0

'

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Transfer from/to performing

'

'

4,792,000

'

415,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Transfer from/to nonperforming

'

'

-415,000

'

-4,792,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Ending balance

$3,123,000

'

$25,797,000

'

$15,556,000

'

'

'

'

'

$1,439,000

'

'

'

$113,000

'

'

$1,571,000

'

'

'

'

Loans_Details_5

Loans (Details 5) (USD $)	Mar. 31, 2014
In Thousands, unless otherwise specified
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method	'
Extended Maturity and Amortization and Reduction of Interest Rate	$68
Extended Maturity And Delay in Payments or Reduction Of Interest Rate	2,478
Delay in Payments or Reduction of Interest Rate	577
Total	3,123
Residential real estate	'
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method	'
Extended Maturity and Amortization and Reduction of Interest Rate	0
Extended Maturity And Delay in Payments or Reduction Of Interest Rate	1,269
Delay in Payments or Reduction of Interest Rate	170
Total	1,439
Indirect vehicle	'
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method	'
Extended Maturity and Amortization and Reduction of Interest Rate	0
Extended Maturity And Delay in Payments or Reduction Of Interest Rate	0
Delay in Payments or Reduction of Interest Rate	113
Total	113
Home equity lines	'
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method	'
Extended Maturity and Amortization and Reduction of Interest Rate	68
Extended Maturity And Delay in Payments or Reduction Of Interest Rate	1,209
Delay in Payments or Reduction of Interest Rate	294
Total	$1,571

Loans_Details_6

Loans (Details 6) (USD $)	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Dec. 31, 2013
Allowance for credit losses [Roll Forward]	'		'		'
Beginning Balance	$111,746,000		'		'
Allowance for unfunded credit commitments, ending balance	1,643,000		2,931,000		'
Allowance for credit losses, ending balance	108,395,000		124,733,000		'
Ending Balance	106,752,000		'		'
Ending allowance balance attributable to loans:	'		'		'
Acquired and accounted for under ASC 310-30	2,208,000		4,132,000		'
Loans:	'		'		'
Individually evaluated for impairment	147,312,000		123,114,000		'
Collectively evaluated for impairment	5,226,562,000		5,162,300,000		'
Acquired and accounted for under ASC 310-30	194,441,000		422,254,000		'
Unfunded Commitments	'		'		'
Allowance for unfunded credit commitments, beginning balance	1,716,000		4,075,000		'
Allowance for unfunded commitments, Provision	-73,000		-1,144,000		'
Unfunded commitments collectively evaluated for impairment	978,000		470,000		'
Individually evaluated for impairment for unfunded commitments	665,000		2,461,000		'
Allowance for unfunded credit commitments, ending balance	1,643,000		2,931,000		'
Allowance for credit losses	'		'		'
Allowance for loan losses and unfunded commitments charge offs	9,601,000		5,953,000		'
Allowance for loan losses and unfunded commitments recoveries	3,384,000		2,407,000		'
Allowance for loan losses and unfunded commitments provision	1,150,000		0		'
Allowance for credit losses, beginning balance	113,462,000		128,279,000		'
Allowance for credit losses, ending balance	108,395,000		124,733,000		'
Allowance for credit losses, individually evaluated for impairment	15,841,000		18,138,000		'
Allowance for credit losses, collectively evaluated for impairment	90,346,000		102,463,000		'
Total loans	5,568,315,000		5,707,668,000		5,712,551,000
Commercial loans	'		'		'
Allowance for credit losses [Roll Forward]	'		'		'
Beginning Balance	23,461,000		24,943,000		'
Charge-offs	90,000		911,000		'
Recoveries	1,628,000		452,000		'
Provision	-1,061,000		-330,000		'
Ending Balance	23,938,000		24,154,000		'
Ending allowance balance attributable to loans:	'		'		'
Individually evaluated for impairment	6,160,000		2,643,000		'
Collectively evaluated for impairment	17,312,000		19,475,000		'
Acquired and accounted for under ASC 310-30	466,000	[1]	2,036,000		'
Loans:	'		'		'
Individually evaluated for impairment	41,191,000		21,134,000		'
Collectively evaluated for impairment	1,208,639,000		1,168,907,000		'
Acquired and accounted for under ASC 310-30	30,976,000	[1]	52,040,000	[1]	'
Allowance for credit losses	'		'		'
Total loans	1,280,806,000		1,242,081,000		'
Commercial loans collateralized by assignment of lease payments	'		'		'
Allowance for credit losses [Roll Forward]	'		'		'
Beginning Balance	9,159,000		7,755,000		'
Charge-offs	0		'		'
Recoveries	0		144,000		'
Provision	-101,000		200,000		'
Ending Balance	9,058,000		8,099,000		'
Ending allowance balance attributable to loans:	'		'		'
Individually evaluated for impairment	174,000		86,000		'
Collectively evaluated for impairment	8,884,000		8,013,000		'
Acquired and accounted for under ASC 310-30	'	[1]	'		'
Loans:	'		'		'
Individually evaluated for impairment	4,235,000		536,000		'
Collectively evaluated for impairment	1,468,386,000		1,347,130,000		'
Allowance for credit losses	'		'		'
Total loans	1,472,621,000		1,347,666,000		'
Commercial real estate	'		'		'
Allowance for credit losses [Roll Forward]	'		'		'
Beginning Balance	51,628,000		61,056,000		'
Charge-offs	7,156,000		1,917,000		'
Recoveries	485,000		740,000		'
Provision	2,583,000		3,268,000		'
Ending Balance	47,540,000		63,147,000		'
Ending allowance balance attributable to loans:	'		'		'
Individually evaluated for impairment	4,151,000		8,912,000		'
Collectively evaluated for impairment	41,707,000		52,248,000		'
Acquired and accounted for under ASC 310-30	1,682,000	[1]	1,987,000	[1]	'
Loans:	'		'		'
Individually evaluated for impairment	57,960,000		59,435,000		'
Collectively evaluated for impairment	1,565,549,000		1,683,894,000		'
Acquired and accounted for under ASC 310-30	95,506,000	[1]	223,952,000	[1]	'
Allowance for credit losses	'		'		'
Total loans	1,719,015,000		1,967,281,000		'
Allowance for loan losses and unfunded commitments acquired with deteriorated credit quality	2,200,000		'		'
Residential real estate	'		'		'
Allowance for credit losses [Roll Forward]	'		'		'
Beginning Balance	8,872,000		6,941,000		'
Charge-offs	265,000		962,000		'
Recoveries	519,000		214,000		'
Provision	-1,039,000		455,000		'
Ending Balance	8,087,000		6,648,000		'
Ending allowance balance attributable to loans:	'		'		'
Individually evaluated for impairment	3,076,000		2,858,000		'
Collectively evaluated for impairment	5,011,000		3,681,000		'
Acquired and accounted for under ASC 310-30	'	[1]	109,000	[1]	'
Loans:	'		'		'
Individually evaluated for impairment	18,151,000		14,791,000		'
Collectively evaluated for impairment	287,790,000		294,145,000		'
Acquired and accounted for under ASC 310-30	5,121,000	[1]	6,414,000	[1]	'
Allowance for credit losses	'		'		'
Total loans	311,062,000		315,350,000		'
Construction real estate	'		'		'
Allowance for credit losses [Roll Forward]	'		'		'
Beginning Balance	6,856,000		11,222,000		'
Charge-offs	56,000		82,000		'
Recoveries	99,000		276,000		'
Provision	-415,000		-2,246,000		'
Ending Balance	6,484,000		9,170,000		'
Ending allowance balance attributable to loans:	'		'		'
Individually evaluated for impairment	195,000		496,000		'
Collectively evaluated for impairment	6,229,000		8,674,000		'
Acquired and accounted for under ASC 310-30	60,000	[1]	'		'
Loans:	'		'		'
Individually evaluated for impairment	782,000		2,160,000		'
Collectively evaluated for impairment	132,215,000		99,421,000		'
Acquired and accounted for under ASC 310-30	36,752,000	[1]	106,927,000	[1]	'
Allowance for credit losses	'		'		'
Total loans	169,749,000		208,508,000		'
Indirect vehicle	'		'		'
Allowance for credit losses [Roll Forward]	'		'		'
Beginning Balance	1,662,000		1,324,000		'
Charge-offs	920,000		729,000		'
Recoveries	442,000		415,000		'
Provision	500,000		389,000		'
Ending Balance	1,684,000		1,399,000		'
Ending allowance balance attributable to loans:	'		'		'
Individually evaluated for impairment	25,000		0		'
Collectively evaluated for impairment	1,659,000		1,399,000		'
Acquired and accounted for under ASC 310-30	'	[1]	'		'
Loans:	'		'		'
Individually evaluated for impairment	183,000		'		'
Collectively evaluated for impairment	265,861,000		220,739,000		'
Allowance for credit losses	'		'		'
Total loans	266,044,000		220,739,000		'
Home equity lines	'		'		'
Allowance for credit losses [Roll Forward]	'		'		'
Beginning Balance	8,478,000		9,401,000		'
Charge-offs	619,000		787,000		'
Recoveries	133,000		114,000		'
Provision	405,000		-826,000		'
Ending Balance	8,397,000		7,902,000		'
Ending allowance balance attributable to loans:	'		'		'
Individually evaluated for impairment	1,395,000		682,000		'
Collectively evaluated for impairment	7,002,000		7,220,000		'
Acquired and accounted for under ASC 310-30	'	[1]	'		'
Loans:	'		'		'
Individually evaluated for impairment	24,810,000		25,058,000		'
Collectively evaluated for impairment	233,310,000		266,132,000		'
Acquired and accounted for under ASC 310-30	110,000	[1]	291,000	[1]	'
Allowance for credit losses	'		'		'
Total loans	258,230,000		291,481,000		'
Other consumer	'		'		'
Allowance for credit losses [Roll Forward]	'		'		'
Beginning Balance	1,630,000		1,562,000		'
Charge-offs	495,000		565,000		'
Recoveries	78,000		52,000		'
Provision	351,000		234,000		'
Ending Balance	1,564,000		1,283,000		'
Ending allowance balance attributable to loans:	'		'		'
Individually evaluated for impairment	'		0		'
Collectively evaluated for impairment	1,564,000		1,283,000		'
Acquired and accounted for under ASC 310-30	'	[1]	'		'
Loans:	'		'		'
Individually evaluated for impairment	0		0		'
Collectively evaluated for impairment	64,812,000		81,932,000		'
Acquired and accounted for under ASC 310-30	25,976,000	[1]	32,630,000	[1]	'
Allowance for credit losses	'		'		'
Total loans	90,788,000		114,562,000		'
Purchased loans	'		'		'
Allowance for credit losses [Roll Forward]	'		'		'
Provision	155,000		'		'
Allowance for credit losses	'		'		'
Provision and charge-offs related to the number of pools	16		'		'
Allowance for loan losses and unfunded commitments write offs net of recoveries	179,000		'		'
Total loans	$146,100,000		'		'
[1]	Loans acquired in FDIC-assisted transactions and accounted for under ASC Subtopic 310-30 “Receivables — Loans and Debt Securities Acquired with Deteriorated Credit Quality.”

Loans_Details_7

Loans (Details 7) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Changes in the accretable yield for purchased credit-impaired loans	'	'
Balance at beginning of period	$2,337	$5,685
Accretion	-550	-1,457
Other	574	92
Balance at end of period	$2,361	$4,320

Loans_Details_8

Loans (Details 8) (USD $)	Mar. 31, 2014		Dec. 31, 2013
Purchased credit-impaired loans and non-credit-impaired loans	'		'
Covered loans	$173,677,000		$235,720,000
Estimated (payable) receivable amount from the FDIC under the loss-share agreement	7,269,000		'
Non covered loans	20,764,000		'
Outstanding balances on purchased loans from the FDIC	202,800,000		268,500,000
Carrying amount on loans purchased from the FDIC	194,400,000		256,400,000
Purchased Credit Impaired Loans Receivable	'		'
Purchased credit-impaired loans and non-credit-impaired loans	'		'
Covered loans	90,065,000		'
Estimated (payable) receivable amount from the FDIC under the loss-share agreement	-1,755,000	[1]	'
Non covered loans	4,912,000		'
Purchased Non-Credit Impaired Loans Receivable	'		'
Purchased credit-impaired loans and non-credit-impaired loans	'		'
Covered loans	83,612,000		'
Estimated (payable) receivable amount from the FDIC under the loss-share agreement	9,024,000	[1]	'
Non covered loans	15,852,000		'
Commercial loans, commercial real estate receivable and construction loans	'		'
Purchased credit-impaired loans and non-credit-impaired loans	'		'
Covered loans, will no longer be covered under the loss-share agreement	3,800,000	[2]	'
Commercial related	'		'
Purchased credit-impaired loans and non-credit-impaired loans	'		'
Covered loans	11,330,000		'
Non covered loans	17,568,000		'
Commercial related | Purchased Credit Impaired Loans Receivable	'		'
Purchased credit-impaired loans and non-credit-impaired loans	'		'
Covered loans	5,660,000	[2]	'
Non covered loans	4,823,000	[3]	'
Reimbursable Amount Covered Other Real Estate Owned	786,000		'
Commercial related | Purchased Non-Credit Impaired Loans Receivable	'		'
Purchased credit-impaired loans and non-credit-impaired loans	'		'
Covered loans	5,670,000	[2]	'
Non covered loans	12,745,000	[3]	'
Commercial loans	'		'
Purchased credit-impaired loans and non-credit-impaired loans	'		'
Covered loans	2,077,000		'
Commercial loans | Purchased Credit Impaired Loans Receivable	'		'
Purchased credit-impaired loans and non-credit-impaired loans	'		'
Covered loans	666,000		'
Commercial loans | Purchased Non-Credit Impaired Loans Receivable	'		'
Purchased credit-impaired loans and non-credit-impaired loans	'		'
Covered loans	1,411,000		'
Commercial real estate	'		'
Purchased credit-impaired loans and non-credit-impaired loans	'		'
Covered loans	95,506,000		'
Commercial real estate | Purchased Credit Impaired Loans Receivable	'		'
Purchased credit-impaired loans and non-credit-impaired loans	'		'
Covered loans	50,176,000		'
Commercial real estate | Purchased Non-Credit Impaired Loans Receivable	'		'
Purchased credit-impaired loans and non-credit-impaired loans	'		'
Covered loans	45,330,000		'
Construction real estate	'		'
Purchased credit-impaired loans and non-credit-impaired loans	'		'
Covered loans	36,753,000		'
Construction real estate | Purchased Credit Impaired Loans Receivable	'		'
Purchased credit-impaired loans and non-credit-impaired loans	'		'
Covered loans	31,030,000		'
Construction real estate | Purchased Non-Credit Impaired Loans Receivable	'		'
Purchased credit-impaired loans and non-credit-impaired loans	'		'
Covered loans	5,723,000		'
Other	'		'
Purchased credit-impaired loans and non-credit-impaired loans	'		'
Covered loans	28,011,000		'
Non covered loans	3,196,000		'
Other | Purchased Credit Impaired Loans Receivable	'		'
Purchased credit-impaired loans and non-credit-impaired loans	'		'
Covered loans	2,533,000		'
Non covered loans	89,000		'
Other | Purchased Non-Credit Impaired Loans Receivable	'		'
Purchased credit-impaired loans and non-credit-impaired loans	'		'
Covered loans	25,478,000		'
Non covered loans	$3,107,000		'
[1]	Estimated reimbursable amounts from the FDIC under the loss-share agreement exclude $786 thousand in reimbursable amounts related to covered other real estate owned.
[2]	Covered commercial related loans include commercial, commercial real estate and construction real estate loans acquired in connection with the Heritage and Benchmark FDIC-assisted transactions.
[3]	Non-covered commercial related loans include commercial, commercial real estate and construction real estate for InBank.

Goodwill_and_Intangibles_Detai

Goodwill and Intangibles (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'	'	'
Goodwill, impairment loss	$0	$0	'
Carrying amount of goodwill	423,369,000	'	423,369,000
Weighted average amortization period (in years)	'4 years	'	'
Changes in the carrying amount of core deposit and client relationship intangibles	'	'	'
Balance at beginning of period	23,428,000	'	'
Amortization expense	-1,240,000	-1,544,000	'
Balance at end of period	22,188,000	'	'
Gross carrying amount	54,368,000	'	'
Accumulated amortization	-32,180,000	'	'
Net book value	22,188,000	'	'
Estimated future amortization expense	'	'	'
2013	3,508,000	'	'
2014	4,030,000	'	'
2015	3,418,000	'	'
2016	3,071,000	'	'
2017	2,812,000	'	'
Thereafter	5,349,000	'	'
Total estimated future amortization expense	$22,188,000	'	'

Deposits_Details

Deposits (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Deposits [Abstract]	'	'
Demand deposit accounts, noninterest bearing	$2,435,868,000	$2,375,863,000
NOW and money market accounts	2,772,766,000	2,682,419,000
Savings accounts	865,910,000	855,394,000
Certificates of deposit, $100,000 or more	790,273,000	827,413,000
Other certificates of deposit	620,930,000	640,170,000
Total	7,485,747,000	7,381,259,000
Brokered deposits	$222,300,000	$224,200,000

ShortTerm_Borrowings_Details

Short-Term Borrowings (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014	Mar. 31, 2014
			Customer repurchase agreements	Customer repurchase agreements	Federal Home Loan Bank advances	Federal Home Loan Bank advances	Line of credit	Libor [Member]
								Line of credit
Short-term borrowings	'	'	'	'	'	'	'	'
Weighted Average Cost	0.20%	0.18%	0.20%	0.20%	0.00%	0.17%	'	'
Amount	$189,872,000	$493,389,000	$189,872,000	$193,389,000	$0	$300,000,000	'	'
Fixed interest rate Federal Home Loan Bank advances	'	300,000,000	'	'	'	'	'	'
Unsecured Line of Credit	'	'	'	'	'	'	$35,000,000	'
Description of interest rate basis	'	'	'	'	'	'	'one month LIBOR	'
Debt Instrument, Basis Spread on Variable Rate	'	'	'	'	'	'	'	2.00%

Longterm_Borrowings_Details

Long-term Borrowings (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Long-term borrowings	'	'
Federal Home Loan Bank advances	$4,300,000	$4,300,000
Effective interest rates on Federal Home Loan Bank advances, low end of range (as a percent)	3.23%	'
Effective interest rates on Federal Home Loan Bank advances, high end of range (as a percent)	5.87%	'
Principal payments due on long-term borrowings	'	'
Long-term Debt	65,664,000	62,159,000
Notes payable to banks	'	'
Long-term borrowings	'	'
Minimum interest rates (as a percent)	2.50%	'
Maximum interest rates (as a percent)	12.00%	'
Equipment pledged as collateral	25,600,000	25,700,000
Principal payments due on long-term borrowings	'	'
Long-term Debt	21,100,000	17,500,000
Structured repurchase agreement	'	'
Long-term borrowings	'	'
Term of structured repurchase agreement (in years)	'10 years	'
Fixed interest rate, if option not exercised (as a percent)	4.75%	'
Principal payments due on long-term borrowings	'	'
Long-term Debt	$40,000,000	'

Junior_Subordinated_Notes_Issu2

Junior Subordinated Notes Issued to Capital Trusts (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014
In Thousands, unless otherwise specified			Junior Subordinated Notes	Coal City Capital Trust I	MB Financial Capital Trust II	MB Financial Capital Trust III	MB Financial Capital Trust IV	MB Financial Capital Trust V	MB Financial Capital Trust VI	FOBB Statutory Trust III
			Maximum	Junior Subordinated Notes	Junior Subordinated Notes	Junior Subordinated Notes	Junior Subordinated Notes	Junior Subordinated Notes	Junior Subordinated Notes	Junior Subordinated Notes
Outstanding junior subordinated notes	'	'	'	'	'	'	'	'	'	'
Principal balance	$152,065	$152,065	'	$25,774	$36,083	$10,310	$20,619	$30,928	$23,196	$5,155
Debt Instrument, Basis Spread on Variable Rate	'	'	'	1.80%	1.40%	1.50%	1.52%	1.30%	1.30%	2.80%
Description of annual interest rate basis	'	'	'	'3-mo LIBOR	'3-mo LIBOR	'3-mo LIBOR	'3-mo LIBOR	'3-mo LIBOR	'3-mo LIBOR	'3-mo LIBOR
Period for deferment of payment of interest on notes (in years)	'	'	'5 years	'	'	'	'	'	'	'

Junior_Subordinated_Notes_Issu3

Junior Subordinated Notes Issued to Capital Trusts (Details 2) (Trust preferred securities issued by each trust, USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014
Coal City Capital Trust I	'
Trust preferred securities issued by each trust	'
Debt Instrument, Basis Spread on Variable Rate	1.80%
Description of annual interest rate basis	'3-mo LIBOR
Face Value	$25,000
MB Financial Capital Trust II	'
Trust preferred securities issued by each trust	'
Debt Instrument, Basis Spread on Variable Rate	1.40%
Description of annual interest rate basis	'3-mo LIBOR
Face Value	35,000
MB Financial Capital Trust III	'
Trust preferred securities issued by each trust	'
Debt Instrument, Basis Spread on Variable Rate	1.50%
Description of annual interest rate basis	'3-mo LIBOR
Face Value	10,000
MB Financial Capital Trust IV	'
Trust preferred securities issued by each trust	'
Debt Instrument, Basis Spread on Variable Rate	1.52%
Description of annual interest rate basis	'3-mo LIBOR
Face Value	20,000
MB Financial Capital Trust V	'
Trust preferred securities issued by each trust	'
Debt Instrument, Basis Spread on Variable Rate	1.30%
Description of annual interest rate basis	'3-mo LIBOR
Face Value	30,000
MB Financial Capital Trust VI	'
Trust preferred securities issued by each trust	'
Debt Instrument, Basis Spread on Variable Rate	1.30%
Description of annual interest rate basis	'3-mo LIBOR
Face Value	22,500
FOBB Statutory Trust III	'
Trust preferred securities issued by each trust	'
Debt Instrument, Basis Spread on Variable Rate	2.80%
Description of annual interest rate basis	'3-mo LIBOR
Face Value	$5,000

Commitments_and_Contingencies_1

Commitments and Contingencies (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Commitments [Abstract]	'	'
Maximum maturity period for letters of credit (in years)	'5 years	'
Increase (decrease) in maximum potential amount of future payments under letters of credit	$5,800,000	'
Dollar amount of letters of credit outstanding	76,000,000	70,300,000
Letters of credit issued or renewed	23,900,000	'
Capital expenditure commitments outstanding	1,700,000	'
Home equity lines	'	'
Commitments and contingencies	'	'
Dollar amount of line of credit outstanding	206,193,000	208,581,000
Other commitments	'	'
Commitments and contingencies	'	'
Dollar amount of line of credit outstanding	1,174,336,000	1,214,391,000
Standby	'	'
Commitments and contingencies	'	'
Dollar amount of line of credit outstanding	75,274,000	69,556,000
Commercial	'	'
Commitments and contingencies	'	'
Dollar amount of line of credit outstanding	$763,000	$708,000

Commitments_and_Contingencies_2

Commitments and Contingencies (Details 2) (States and political subdivisions, State of Illinois)	3 Months Ended
	Mar. 31, 2014
States and political subdivisions | State of Illinois	'
Concentrations of credit risk	'
Percentage of investments issued by states and political subdivisions that were within the state of Illinois	29.00%

Fair_Value_Measurements_Detail

Fair Value Measurements (Details) (USD $)	Mar. 31, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Financial assets and financial liabilities measured at fair value on a recurring basis	'		'
Securities available for sale, at fair value	$1,082,050		$1,118,912
Loans held for sale	802		629
Derivative financial instruments, assets	3,964		5,875
Derivative financial instrument, liabilities	12,652		12,753
U.S. Government sponsored agencies and enterprises	'		'
Financial assets and financial liabilities measured at fair value on a recurring basis	'		'
Securities available for sale, at fair value	51,836		52,068
States and political subdivisions	'		'
Financial assets and financial liabilities measured at fair value on a recurring basis	'		'
Securities available for sale, at fair value	19,350		19,143
Residential mortgage-backed securities	'		'
Financial assets and financial liabilities measured at fair value on a recurring basis	'		'
Securities available for sale, at fair value	673,515		701,233
Commercial mortgage-backed securities	'		'
Financial assets and financial liabilities measured at fair value on a recurring basis	'		'
Securities available for sale, at fair value	52,924		52,941
Corporate bonds	'		'
Financial assets and financial liabilities measured at fair value on a recurring basis	'		'
Securities available for sale, at fair value	273,853		283,070
Equity securities	'		'
Financial assets and financial liabilities measured at fair value on a recurring basis	'		'
Securities available for sale, at fair value	10,572		10,457
Recurring basis | Total Fair Value	'		'
Financial assets and financial liabilities measured at fair value on a recurring basis	'		'
Loans held for sale	802		629
Assets held in trust for deferred compensation	11,451		10,679
Derivative financial instruments, assets	16,696		18,645
Other liabilities	11,366		10,569
Derivative financial instrument, liabilities	16,600		18,632
Recurring basis | Total Fair Value | U.S. Government sponsored agencies and enterprises	'		'
Financial assets and financial liabilities measured at fair value on a recurring basis	'		'
Securities available for sale, at fair value	51,836		52,068
Recurring basis | Total Fair Value | States and political subdivisions	'		'
Financial assets and financial liabilities measured at fair value on a recurring basis	'		'
Securities available for sale, at fair value	19,350		19,143
Recurring basis | Total Fair Value | Residential mortgage-backed securities	'		'
Financial assets and financial liabilities measured at fair value on a recurring basis	'		'
Securities available for sale, at fair value	673,515		701,233
Recurring basis | Total Fair Value | Commercial mortgage-backed securities	'		'
Financial assets and financial liabilities measured at fair value on a recurring basis	'		'
Securities available for sale, at fair value	52,924		52,941
Recurring basis | Total Fair Value | Corporate bonds	'		'
Financial assets and financial liabilities measured at fair value on a recurring basis	'		'
Securities available for sale, at fair value	273,853		283,070
Recurring basis | Total Fair Value | Equity securities	'		'
Financial assets and financial liabilities measured at fair value on a recurring basis	'		'
Securities available for sale, at fair value	10,572		10,457
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)	'		'
Financial assets and financial liabilities measured at fair value on a recurring basis	'		'
Securities available for sale, at fair value	10,572		10,457
Loans held for sale	0		0
Assets held in trust for deferred compensation	11,451		10,679
Derivative financial instruments, assets	0		0
Other liabilities	11,366	[1]	10,569	[1]
Derivative financial instrument, liabilities	0		0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities	'		'
Financial assets and financial liabilities measured at fair value on a recurring basis	'		'
Securities available for sale, at fair value	10,572		10,457
Recurring basis | Significant Other Observable Inputs (Level 2)	'		'
Financial assets and financial liabilities measured at fair value on a recurring basis	'		'
Securities available for sale, at fair value	1,065,979		1,102,599
Loans held for sale	802		629
Derivative financial instruments, assets	16,696		18,645
Derivative financial instrument, liabilities	16,600		18,632
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. Government sponsored agencies and enterprises	'		'
Financial assets and financial liabilities measured at fair value on a recurring basis	'		'
Securities available for sale, at fair value	51,836		52,068
Recurring basis | Significant Other Observable Inputs (Level 2) | States and political subdivisions	'		'
Financial assets and financial liabilities measured at fair value on a recurring basis	'		'
Securities available for sale, at fair value	19,350		19,143
Recurring basis | Significant Other Observable Inputs (Level 2) | Residential mortgage-backed securities	'		'
Financial assets and financial liabilities measured at fair value on a recurring basis	'		'
Securities available for sale, at fair value	672,864		700,542
Recurring basis | Significant Other Observable Inputs (Level 2) | Commercial mortgage-backed securities	'		'
Financial assets and financial liabilities measured at fair value on a recurring basis	'		'
Securities available for sale, at fair value	52,924		52,941
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate bonds	'		'
Financial assets and financial liabilities measured at fair value on a recurring basis	'		'
Securities available for sale, at fair value	269,005		277,905
Recurring basis | Significant Unobservable Inputs (Level 3)	'		'
Financial assets and financial liabilities measured at fair value on a recurring basis	'		'
Securities available for sale, at fair value	5,499		5,856
Loans held for sale	0		0
Derivative financial instruments, assets	0		0
Derivative financial instrument, liabilities	0		0
Recurring basis | Significant Unobservable Inputs (Level 3) | Residential mortgage-backed securities	'		'
Financial assets and financial liabilities measured at fair value on a recurring basis	'		'
Securities available for sale, at fair value	651		691
Recurring basis | Significant Unobservable Inputs (Level 3) | Corporate bonds	'		'
Financial assets and financial liabilities measured at fair value on a recurring basis	'		'
Securities available for sale, at fair value	$4,848		$5,165
[1]	Liabilities associated with assets held in trust for deferred compensation

Fair_Value_Measurements_Detail1

Fair Value Measurements (Details 2) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Assets measured at fair value on a nonrecurring basis	'	'	'
Securities available for sale, at fair value	$1,082,050	'	$1,118,912
Financial assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3)	'	'	'
Balance at the beginning of the period	5,856	6,071	'
Other comprehensive income	-179	-103	'
Principal payments	-178	-40	'
Balance at the end of the period	5,499	5,928	'
Fair value assumption, allowance for impaired real estate loans percentage	100.00%	'	'
Residential mortgage-backed securities	'	'	'
Assets measured at fair value on a nonrecurring basis	'	'	'
Securities available for sale, at fair value	673,515	'	701,233
Corporate bonds	'	'	'
Assets measured at fair value on a nonrecurring basis	'	'	'
Securities available for sale, at fair value	273,853	'	283,070
Significant Unobservable Inputs (Level 3) | Recurring basis	'	'	'
Assets measured at fair value on a nonrecurring basis	'	'	'
Securities available for sale, at fair value	5,499	'	5,856
Significant Unobservable Inputs (Level 3) | Recurring basis | Residential mortgage-backed securities	'	'	'
Assets measured at fair value on a nonrecurring basis	'	'	'
Securities available for sale, at fair value	651	'	691
Significant Unobservable Inputs (Level 3) | Recurring basis | Corporate bonds	'	'	'
Assets measured at fair value on a nonrecurring basis	'	'	'
Credit assumption (as a percent)	20.00%	'	'
Securities available for sale, at fair value	$4,848	'	$5,165
Significant Unobservable Inputs (Level 3) | Recurring basis | Minimum | Residential mortgage-backed securities	'	'	'
Assets measured at fair value on a nonrecurring basis	'	'	'
Constant prepayment rates (as a percent)	1.00%	'	'
Significant Unobservable Inputs (Level 3) | Recurring basis | Maximum | Residential mortgage-backed securities	'	'	'
Assets measured at fair value on a nonrecurring basis	'	'	'
Constant prepayment rates (as a percent)	3.00%	'	'
Significant Unobservable Inputs (Level 3) | Nonrecurring basis | Minimum	'	'	'
Assets measured at fair value on a nonrecurring basis	'	'	'
Appraisal adjustment impaired loans (as a percent)	5.00%	'	'
Appraisal adjustment foreclosed assets (as a percent)	5.00%	'	'
Significant Unobservable Inputs (Level 3) | Nonrecurring basis | Maximum	'	'	'
Assets measured at fair value on a nonrecurring basis	'	'	'
Appraisal adjustment impaired loans (as a percent)	10.00%	'	'
Appraisal adjustment foreclosed assets (as a percent)	10.00%	'	'

Fair_Value_Measurements_Detail2

Fair Value Measurements (Details 3) (Nonrecurring basis, USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Total Fair Value	'	'
Financial Assets:	'	'
Impaired loans	$99,923	$77,497
Foreclosed assets	44,382	44,601
Significant Unobservable Inputs (Level 3)	'	'
Financial Assets:	'	'
Impaired loans	99,923	77,497
Foreclosed assets	$44,382	$44,601

Fair_Value_Measurements_Detail3

Fair Value Measurements (Details 4) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Fair Value Disclosures [Abstract]	'	'
Maximum maturity period of short-term borrowings where carrying value approximates fair value (in days)	'90 days	'
Minimum maturity period of short-term borrowings where fair value is based on discounted value of contractual cash flows (in days)	'90 days	'
Financial Assets:	'	'
Cash and due from banks	$268,803	$205,193
Federal funds sold	7,500	42,950
Interest bearing deposits with banks	244,819	268,266
Securities available for sale, at fair value	1,082,050	1,118,912
Investment securities held to maturity	1,188,692	1,182,533
Investment securities held to maturity	1,223,471	1,198,929
Non-marketable securities - FHLB and FRB stock	51,432	51,417
Loans held for sale	802	629
Loans, net	5,461,563	5,600,805
Derivative financial instruments	3,964	5,875
Financial Liabilities:	'	'
Non-interest bearing deposits	2,435,868	2,375,863
Interest bearing deposits	5,049,879	5,005,396
Short-term borrowings	189,872	493,389
Long-term borrowings	65,664	62,159
Junior subordinated notes issued to capital trusts	152,065	152,065
Derivative financial instruments	12,652	12,753
Carrying Amount	'	'
Financial Assets:	'	'
Cash and due from banks	268,803	205,193
Federal funds sold	7,500	42,950
Interest bearing deposits with banks	244,819	268,266
Securities available for sale, at fair value	1,082,050	1,118,912
Investment securities held to maturity	1,188,692	'
Investment securities held to maturity	'	1,182,533
Non-marketable securities - FHLB and FRB stock	51,432	51,417
Loans held for sale	802	629
Loans, net	5,461,563	'
Loans, net	'	5,600,805
Accrued interest receivable	35,065	36,593
Derivative financial instruments	16,696	18,645
Financial Liabilities:	'	'
Non-interest bearing deposits	2,435,868	2,375,863
Interest bearing deposits	5,049,879	5,005,396
Short-term borrowings	189,872	493,389
Long-term borrowings	65,664	'
Long-term borrowings	'	62,159
Junior subordinated notes issued to capital trusts	152,065	152,065
Accrued interest payable	2,014	2,042
Derivative financial instruments	16,600	18,632
Total Fair Value	'	'
Financial Assets:	'	'
Cash and due from banks	268,803	205,193
Federal funds sold	7,500	42,950
Interest bearing deposits with banks	244,819	268,266
Securities available for sale, at fair value	1,082,050	1,118,912
Investment securities held to maturity	1,223,471	1,198,929
Non-marketable securities - FHLB and FRB stock	51,432	51,417
Loans held for sale	802	629
Loans, net	5,418,234	5,583,759
Accrued interest receivable	35,065	36,593
Derivative financial instruments	16,696	18,645
Financial Liabilities:	'	'
Non-interest bearing deposits	2,435,868	2,375,863
Interest bearing deposits	5,057,386	5,012,928
Short-term borrowings	189,865	493,384
Long-term borrowings	69,862	66,301
Junior subordinated notes issued to capital trusts	102,577	101,247
Accrued interest payable	2,014	2,042
Derivative financial instruments	16,600	18,632
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)	'	'
Financial Assets:	'	'
Cash and due from banks	268,803	205,193
Federal funds sold	7,500	42,950
Interest bearing deposits with banks	244,819	268,266
Securities available for sale, at fair value	10,572	10,457
Investment securities held to maturity	0	0
Non-marketable securities - FHLB and FRB stock	0	0
Loans held for sale	0	0
Loans, net	0	0
Accrued interest receivable	35,065	36,593
Derivative financial instruments	0	0
Financial Liabilities:	'	'
Non-interest bearing deposits	2,435,868	2,375,863
Interest bearing deposits	0	0
Short-term borrowings	0	0
Long-term borrowings	0	0
Junior subordinated notes issued to capital trusts	0	0
Accrued interest payable	2,014	2,042
Derivative financial instruments	0	0
Recurring basis | Significant Other Observable Inputs (Level 2)	'	'
Financial Assets:	'	'
Cash and due from banks	0	0
Federal funds sold	0	0
Interest bearing deposits with banks	0	0
Securities available for sale, at fair value	1,065,979	1,102,599
Investment securities held to maturity	1,223,471	1,198,929
Non-marketable securities - FHLB and FRB stock	0	0
Loans held for sale	802	629
Loans, net	0	0
Accrued interest receivable	0	0
Derivative financial instruments	16,696	18,645
Financial Liabilities:	'	'
Non-interest bearing deposits	0	0
Interest bearing deposits	0	0
Short-term borrowings	0	0
Long-term borrowings	0	0
Junior subordinated notes issued to capital trusts	0	0
Accrued interest payable	0	0
Derivative financial instruments	16,600	18,632
Recurring basis | Significant Unobservable Inputs (Level 3)	'	'
Financial Assets:	'	'
Cash and due from banks	0	0
Federal funds sold	0	0
Interest bearing deposits with banks	0	0
Securities available for sale, at fair value	5,499	5,856
Investment securities held to maturity	0	0
Non-marketable securities - FHLB and FRB stock	51,432	51,417
Loans held for sale	0	0
Loans, net	5,418,234	5,583,759
Accrued interest receivable	0	0
Derivative financial instruments	0	0
Financial Liabilities:	'	'
Non-interest bearing deposits	0	0
Interest bearing deposits	5,057,386	5,012,928
Short-term borrowings	189,865	493,384
Long-term borrowings	69,862	66,301
Junior subordinated notes issued to capital trusts	102,577	101,247
Accrued interest payable	0	0
Derivative financial instruments	$0	$0

Stock_Incentive_Plans_Details

Stock Incentive Plans (Details) (USD $)

3 Months Ended

3 Months Ended

12 Months Ended

3 Months Ended

Mar. 31, 2014

Mar. 31, 2013

Mar. 31, 2014

Jun. 30, 2011

Mar. 31, 2014

Mar. 31, 2013

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2013

Mar. 31, 2014

Mar. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Omnibus Incentive Plan (the "Omnibus Plan")

Omnibus Incentive Plan (the "Omnibus Plan")

Stock options

Stock options

Stock options

Restricted stock and restricted stock units

Restricted stock and restricted stock units

Restricted stock

Performance-based restricted stock units

Performance-based restricted stock units

Performance-based restricted stock units

Market-based restricted stock

Minimum

Minimum

Maximum

Maximum

Director

Director

Restricted stock and restricted stock units

Performance-based restricted stock units

Restricted stock and restricted stock units

Performance-based restricted stock units

Impact of the share-based payment plans in the financial statements

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total cost of share-based payment plans during the period

$2,012,000

$1,260,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Amount of related income tax benefit recognized in income

790,000

501,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock-based compensation

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of additional authorized shares

'

'

'

2,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of common shares authorized for issuance

'

'

'

8,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Numerator of shares granted beyond threshold limit

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Denominator of shares granted beyond threshold limit

1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of shares available for future grants

'

'

943,653

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Continuous service period for vesting of option awards (in years)

'

'

'

'

'4 years

'

'

'

'

'

'

'

'

'

'

'

'

'

Contractual terms of option awards (in years)

'

'

'

'

'10 years

'

'

'

'

'

'

'

'

'

'

'

'

'

Minimum vesting period (in years)

'

'

'

'

'

'

'5 years

'

'

'1 year

'

'

'

'

'2 years

'

'4 years

'

Maximum percentage of fees with an option to be received in equity-based incentive awards

'

'

'

'

'

'

70.00%

'

'

100.00%

'

'

'

'

'

'

'

'

Period of restriction for sale of underlying shares (in months)

'

'

'

'

'

'

'6 months

'

'

'

'

'

'

'

'

'

'

'

Share-based compensation arrangement by share-based payment award, equity instruments other than options, vested in period, intrinsic value

'

'

'

'

'

'

'

1,000,000

293,000

'

'

'

'

'

'

'

'

'

Number of shares issued

'

'

'

'

'

'

'

'

'

'

48,569

56,752

65,333

92,717

'

'

'

'

Share-Based Compensation Arrangement By Share Based Payment Award, Percentage Of Shares Earned To Number Of Units Issued

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.00%

'

175.00%

Performance based restricted units performance period (in years)

'

'

'

'

'

'

'

'

'

'

'3 years

'

'

'

'

'

'

'

Share based compensation restricted stock units multiplier (in percent)

'

'

'

'

'

'

'

'

'

'

100.00%

'

'

'

'

'

'

'

Number of consecutive trading days over which a specified closing price of the entity's stock is maintained

'

'

'

'

'

'

'

'

'

'

'

'

'

'10 days

'

'

'

'

Minimum closing price of the entity's stock (in dollars per share)

'

'

'

'

'

'

'

'

'

'

'

'

'

$27

'

'

'

'

Unrecognized compensation cost

'

'

19,400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Expected weighted-average period for recognition of unrecognized compensation expense (in years)

'

'

'2 years 10 months 24 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Options outstanding activity

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Options outstanding at the beginning of the period (in shares)

'

'

'

'

2,443,752

'

'

'

'

'

'

'

'

'

'

'

'

'

Granted (in shares)

'

'

'

'

187,403

'

'

'

'

'

'

'

'

'

'

'

'

'

Exercised (in shares)

'

'

'

'

-51,292

'

'

'

'

'

'

'

'

'

'

'

'

'

Expired or cancelled (in shares)

'

'

'

'

-17,800

'

'

'

'

'

'

'

'

'

'

'

'

'

Forfeited (in shares)

'

'

'

'

-13,082

'

'

'

'

'

'

'

'

'

'

'

'

'

Options outstanding at the end of the period (in shares)

'

'

'

'

2,548,981

'

'

'

'

'

'

'

'

'

'

'

'

'

Options exercisable at end of the period (in shares)

'

'

'

'

1,708,542

'

'

'

'

'

'

'

'

'

'

'

'

'

Weighted Average Exercise Price

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Options outstanding at the beginning of the period (in dollars per share)

'

'

'

'

$27.57

'

'

'

'

'

'

'

'

'

'

'

'

'

Granted (in dollars per share)

'

'

'

'

$29.87

'

'

'

'

'

'

'

'

'

'

'

'

'

Exercised (in dollars per share)

'

'

'

'

$19.45

'

'

'

'

'

'

'

'

'

'

'

'

'

Expired or cancelled (in dollars per share)

'

'

'

'

$31.23

'

'

'

'

'

'

'

'

'

'

'

'

'

Forfeited (in dollars per share)

'

'

'

'

$21.22

'

'

'

'

'

'

'

'

'

'

'

'

'

Options outstanding at the end of the period (in dollars per share)

'

'

'

'

$27.90

'

'

'

'

'

'

'

'

'

'

'

'

'

Options exercisable at end of the period (in dollars per share)

'

'

'

'

$30.24

'

'

'

'

'

'

'

'

'

'

'

'

'

Weighted Average Remaining Contractual Term (In Years)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Options outstanding at the end of the period

'

'

'

'

'4 years 10 months 16 days

'

'

'

'

'

'

'

'

'

'

'

'

'

Options exercisable at end of the period

'

'

'

'

'3 years 2 months 18 days

'

'

'

'

'

'

'

'

'

'

'

'

'

Aggregate Intrinsic Value

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Options outstanding at the end of the period

'

'

'

'

12,732,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Options exercisable at end of the period

'

'

'

'

6,180,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair value assumptions

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Risk free interest rate (as a percent)

'

'

'

'

1.89%

'

'

'

'

'

'

'

'

'

'

'

'

'

Expected volatility of Company's stock (as a percent)

'

'

'

'

23.67%

'

'

'

'

'

'

'

'

'

'

'

'

'

Expected dividend yield (as a percent)

'

'

'

'

1.61%

'

'

'

'

'

'

'

'

'

'

'

'

'

Expected life of options (in years)

'

'

'

'

'5 years 10 months 24 days

'

'

'

'

'

'

'

'

'

'

'

'

'

Weighted average fair value per option of options granted during the year (in dollars per share)

'

'

'

'

$6.31

'

'

'

'

'

'

'

'

'

'

'

'

'

Total intrinsic value of options exercised

'

'

'

'

$550,000

$2,000

'

'

'

'

'

'

'

'

'

'

'

'

Changes in restricted shares

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Nonvested shares of restricted stock and nonvested restricted stock units at the beginning of the period

'

'

'

'

'

'

'

685,719

'

'

'

'

'

'

'

'

'

'

Granted (in shares)

'

'

'

'

'

'

'

256,951

'

'

'

'

'

'

'

'

'

'

Vested (in shares)

'

'

'

'

'

'

'

-33,575

'

'

'

'

'

'

'

'

'

'

Forfeited (in shares)

'

'

'

'

'

'

'

-6,274

'

'

'

'

'

'

'

'

'

'

Nonvested shares of restricted stock and nonvested restricted stock units at the end of the period

'

'

'

'

'

'

'

902,821

'

'

'

'

'

'

'

'

'

'

Weighted Average Grant Date Fair Value, restricted shares

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Shares Outstanding at the beginning of the period (in dollars per share)

'

'

'

'

'

'

'

$22.59

'

'

'

'

'

'

'

'

'

'

Granted (in dollars per share)

'

'

'

'

'

'

'

$30.59

'

'

'

'

'

'

'

'

'

'

Vested (in dollars per share)

'

'

'

'

'

'

'

$21.44

'

'

'

'

'

'

'

'

'

'

Forfeited (in dollars per share)

'

'

'

'

'

'

'

$22.90

'

'

'

'

'

'

'

'

'

'

Nonvested shares of restricted stock and nonvested restricted stock units at the end of the period (in dollars per share)

'

'

'

'

'

'

'

$24.91

'

'

'

'

'

'

'

'

'

'

Derivative_Financial_Instrumen2

Derivative Financial Instruments (Details) (USD $)	3 Months Ended			12 Months Ended
	Mar. 31, 2014		Mar. 31, 2013	Dec. 31, 2013
Derivative [Line Items]	'		'	'
Net amount receivable under interest rate swap	$6,000		'	'
Net amount payable under interest rate swap	'		'	25,000
Interest rate swap credit risk exposure	15,500,000		'	'
Asset Derivatives, Notional Amount	678,296,000		'	667,934,000
Asset Derivatives, Estimated Fair Value	16,696,000		'	18,645,000
Liability Derivatives, Notional Amount	677,675,000		'	684,999,000
Liability Derivatives, Estimated Fair Value	-16,600,000		'	-18,632,000
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]	'		'	'
Amounts of gain or (loss) recognized in income on derivatives	81,000		2,000	'
Stand-alone derivative instruments	'		'	'
Derivative [Line Items]	'		'	'
Asset Derivatives, Notional Amount	678,296,000		'	667,934,000
Asset Derivatives, Estimated Fair Value	16,696,000		'	18,645,000
Liability Derivatives, Notional Amount	677,447,000		'	684,761,000
Liability Derivatives, Estimated Fair Value	-16,579,000		'	-18,609,000
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]	'		'	'
Amounts of gain or (loss) recognized in income on derivatives	81,000		3,000	'
Commercial loan interest rate swaps	'		'	'
Derivative [Line Items]	'		'	'
Liability Derivatives, Notional Amount	228,000		'	'
Interest rate swap contracts | Derivative instruments designated as hedges of fair value	'		'	'
Derivative [Line Items]	'		'	'
Liability Derivatives, Notional Amount	228,000	[1]	'	238,000	[1]
Liability Derivatives, Estimated Fair Value	-21,000	[1]	'	-23,000	[1]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]	'		'	'
Amounts of gain or (loss) recognized in income on derivatives	0		-1,000	'
Interest rate swap contracts | Stand-alone derivative instruments	'		'	'
Derivative [Line Items]	'		'	'
Asset Derivatives, Notional Amount	563,291,000	[2]	'	550,883,000	[2]
Asset Derivatives, Estimated Fair Value	15,500,000	[2]	'	17,298,000	[2]
Liability Derivatives, Notional Amount	564,210,000	[2]	'	551,798,000	[2]
Liability Derivatives, Estimated Fair Value	-15,543,000	[2]	'	-17,350,000	[2]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]	'		'	'
Amounts of gain or (loss) recognized in income on derivatives	9,000		11,000	'
Interest rate options contracts | Stand-alone derivative instruments	'		'	'
Derivative [Line Items]	'		'	'
Asset Derivatives, Notional Amount	86,057,000	[2]	'	83,907,000	[2]
Asset Derivatives, Estimated Fair Value	308,000	[2]	'	323,000	[2]
Liability Derivatives, Notional Amount	86,057,000	[2]	'	84,953,000	[2]
Liability Derivatives, Estimated Fair Value	-308,000	[2]	'	-323,000	[2]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]	'		'	'
Amounts of gain or (loss) recognized in income on derivatives	0		0	'
Foreign exchange contracts | Stand-alone derivative instruments	'		'	'
Derivative [Line Items]	'		'	'
Asset Derivatives, Notional Amount	26,222,000	[2]	'	31,361,000	[2]
Asset Derivatives, Estimated Fair Value	858,000	[2]	'	1,006,000	[2]
Liability Derivatives, Notional Amount	25,845,000	[2]	'	47,760,000	[2]
Liability Derivatives, Estimated Fair Value	-726,000	[2]	'	-935,000	[2]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]	'		'	'
Amounts of gain or (loss) recognized in income on derivatives	61,000		5,000	'
Spot foreign exchange contract | Stand-alone derivative instruments	'		'	'
Derivative [Line Items]	'		'	'
Asset Derivatives, Notional Amount	1,153,000	[2]	'	0	[2]
Asset Derivatives, Estimated Fair Value	8,000	[2]	'	0	[2]
Liability Derivatives, Notional Amount	741,000	[2]	'	0	[2]
Liability Derivatives, Estimated Fair Value	0	[2]	'	0	[2]
Mortgage banking derivatives | Stand-alone derivative instruments	'		'	'
Derivative [Line Items]	'		'	'
Asset Derivatives, Notional Amount	1,573,000	[2]	'	1,783,000	[2]
Asset Derivatives, Estimated Fair Value	22,000	[2]	'	18,000	[2]
Liability Derivatives, Notional Amount	594,000	[2]	'	250,000	[2]
Liability Derivatives, Estimated Fair Value	-2,000	[2]	'	-1,000	[2]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]	'		'	'
Amounts of gain or (loss) recognized in income on derivatives	$3,000		($13,000)	'
[1]	Hedged fixed-rate commercial real estate loans
[2]	These portfolio swaps are not designated as hedging instruments under ASC Topic 815.

Derivative_Financial_Instrumen3

Derivative Financial Instruments (Details 2) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Derivative [Line Items]	'	'
Financial Assets, Gross Amount Recognized	$3,964	$5,875
Financial Assets, Gross Amount Offset	0	0
Financial Assets, Net Amount Recognized	3,964	5,875
Financial Liabilities, Gross Amount Recognized	12,652	12,753
Financial Liabilities, Gross Amount Offset	0	0
Financial Liabilities, Net Amount Recognized	12,652	12,753
Repurchase Agreements, Financial Assets, Gross Amount Recognized	0	0
Repurchase Agreements, Financial Assets, Gross Amount Offset	0	0
Repurchase Agreements, Financial Assets, Net Amount Recognized	0	0
Repurchase Agreements, Financial Liabilities, Gross Amount Recognized	189,872	193,389
Repurchase Agreements, Financial Liabilities, Gross Amount Offset	0	0
Repurchase Agreements, Financial Liabilities, Net Amount Recognized	189,872	193,389
Total Financial Assets, Gross Amount Recognized	3,964	5,875
Total Financial Assets, Gross Amount Offset	0	0
Total Financial Assets, Net Amount Recognized	3,964	5,875
Total Financial Liabilities, Gross Amount Recognized	202,524	206,142
Total Financial Liabilities, Gross Amount Offset	0	0
Total Financial Liabilities, Net Amount Recognized	202,524	206,142
Interest rate swaps, caps and floors	'	'
Derivative [Line Items]	'	'
Financial Assets, Gross Amount Recognized	3,896	5,792
Financial Assets, Gross Amount Offset	0	0
Financial Assets, Net Amount Recognized	3,896	5,792
Financial Liabilities, Gross Amount Recognized	11,976	11,904
Financial Liabilities, Gross Amount Offset	0	0
Financial Liabilities, Net Amount Recognized	11,976	11,904
Foreign currency forward contracts	'	'
Derivative [Line Items]	'	'
Financial Assets, Gross Amount Recognized	67	80
Financial Assets, Gross Amount Offset	0	0
Financial Assets, Net Amount Recognized	67	80
Financial Liabilities, Gross Amount Recognized	675	848
Financial Liabilities, Gross Amount Offset	0	0
Financial Liabilities, Net Amount Recognized	675	848
Mortgage banking derivatives	'	'
Derivative [Line Items]	'	'
Financial Assets, Gross Amount Recognized	1	3
Financial Assets, Gross Amount Offset	0	0
Financial Assets, Net Amount Recognized	1	3
Financial Liabilities, Gross Amount Recognized	1	1
Financial Liabilities, Gross Amount Offset	0	0
Financial Liabilities, Net Amount Recognized	$1	$1

Derivative_Financial_Instrumen4

Derivative Financial Instruments (Details 3) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Derivative [Line Items]	'	'
Financial Assets, Net Amount Recognized	$3,964	$5,875
Financial Assets, Financial Instruments	-2,837	-2,912
Financial Assets, Collateral	0	0
Financial Assets, Net Amount	1,127	2,963
Financial Liabilities, Net Amount Recognized	12,652	12,753
Financial Liabilities, Financial Instruments	-2,836	-2,912
Financial Liabilities, Collateral	-9,798	-9,786
Financial Liabilities, Net Amount	18	55
Repurchase Agreements, Financial Assets, Net Amount Recognized	0	0
Repurchase Agreements, Financial Assets, Financial Instruments	0	0
Repurchase Agreements, Financial Assets, Collateral	0	0
Repurchase Agreements, Financial Assets, Net Amount	0	0
Repurchase Agreements, Financial Liabilities, Net Amount Recognized	189,872	193,389
Repurchase Agreements, Financial Liabilities, Financial Instruments	0	0
Repurchase Agreements, Financial Liabilities, Financial Instruments	-189,872	-193,389
Repurchase Agreements, Financial Liabilities, Collateral	0	0
Total Financial Assets, Net Amount Recognized	3,964	5,875
Total Financial Assets, Financial Instruments	-2,837	-2,912
Total Financial Assets, Collateral	0	0
Total Financial Assets, Net Amount	1,127	2,963
Total Financial Liabilities, Net Amount Recognized	202,524	206,142
Total Financial Liabilities, Financial Instruments	-2,836	-2,912
Total Financial Liabilities, Collateral	-199,670	-203,175
Total Financial Liabilities, Net Amount	18	55
Counterparty A	'	'
Derivative [Line Items]	'	'
Financial Assets, Net Amount Recognized	389	883
Financial Assets, Financial Instruments	-389	-883
Financial Assets, Collateral	0	0
Financial Assets, Net Amount	0	0
Financial Liabilities, Net Amount Recognized	10,186	10,669
Financial Liabilities, Financial Instruments	-388	-883
Financial Liabilities, Collateral	-9,798	-9,786
Financial Liabilities, Net Amount	0	0
Counterparty B	'	'
Derivative [Line Items]	'	'
Financial Assets, Net Amount Recognized	1,227	1,836
Financial Assets, Financial Instruments	-810	-412
Financial Assets, Collateral	0	0
Financial Assets, Net Amount	417	1,424
Financial Liabilities, Net Amount Recognized	810	412
Financial Liabilities, Financial Instruments	-810	-412
Financial Liabilities, Collateral	0	0
Financial Liabilities, Net Amount	0	0
Counterparty C	'	'
Derivative [Line Items]	'	'
Financial Assets, Net Amount Recognized	1,788	2,380
Financial Assets, Financial Instruments	-1,631	-1,612
Financial Assets, Collateral	0	0
Financial Assets, Net Amount	157	768
Financial Liabilities, Net Amount Recognized	1,631	1,612
Financial Liabilities, Financial Instruments	-1,631	-1,612
Financial Liabilities, Collateral	0	0
Financial Liabilities, Net Amount	0	0
Other counterparties	'	'
Derivative [Line Items]	'	'
Financial Assets, Net Amount Recognized	560	776
Financial Assets, Financial Instruments	-7	-5
Financial Assets, Collateral	0	0
Financial Assets, Net Amount	553	771
Financial Liabilities, Net Amount Recognized	25	60
Financial Liabilities, Financial Instruments	-7	-5
Financial Liabilities, Collateral	0	0
Financial Liabilities, Net Amount	$18	$55

Operating_Segments_Details

Operating Segments (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]	'	'	'
Net interest income	$67,328	$67,685	'
Provision for credit losses	1,150	0	'
Non-interest income	36,612	38,703	'
Non-interest expense	76,047	71,429	'
Income tax expense	6,774	10,053	'
Net income	19,969	24,906	'
Total assets	9,437,303	9,385,830	9,641,427
Banking	'	'	'
Segment Reporting Information [Line Items]	'	'	'
Net interest income	65,119	66,806	'
Provision for credit losses	1,080	-47	'
Non-interest income	24,258	22,909	'
Non-interest expense	67,697	63,677	'
Income tax expense	4,483	6,700	'
Net income	16,117	19,385	'
Total assets	8,968,195	9,025,700	'
Leasing	'	'	'
Segment Reporting Information [Line Items]	'	'	'
Net interest income	2,209	879	'
Provision for credit losses	70	47	'
Non-interest income	12,354	15,794	'
Non-interest expense	8,350	7,752	'
Income tax expense	2,291	3,353	'
Net income	3,852	5,521	'
Total assets	$469,108	$360,130	'