MB Financial 10-K 19 Feb 16 2015 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2015	Feb. 18, 2016	Jun. 30, 2015
Document and Entity Information
Entity Registrant Name	MB FINANCIAL INC /MD
Entity Central Index Key	1,139,812
Document Type	10-K
Document Period End Date	Dec. 31, 2015
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 2,429,680,490
Entity Common Stock, Shares Outstanding		73,681,692
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	FY

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Assets
Cash and due from banks	$ 307,869	$ 256,804
Interest earning deposits with banks	73,572	55,277
Total cash and cash equivalents	381,441	312,081
Investment securities:
Securities available for sale, at fair value	1,585,023	1,654,752
Securities held to maturity, at amortized cost ($1,274,767 and $1,035,061 fair value at December 31, 2015 and 2014, respectively)	1,230,810	993,380
Non-marketable securities - FHLB and FRB stock	114,233	75,569
Total investment securities	2,930,066	2,723,701
Loans held for sale	744,727	737,209
Loans:
Total loans, excluding purchased credit impaired loans	9,652,592	8,831,572
Purchased credit impaired loans	141,406	251,645
Total loans	9,793,998	9,083,217
Less: Allowance for loan and lease losses	128,140	110,026
Net loans	9,665,858	8,973,191
Lease investment, net	211,687	162,833
Premises and equipment, net	236,013	238,377
Cash surrender value of life insurance	136,953	133,562
Goodwill	725,070	711,521
Other intangibles	44,812	38,006
Mortgage servicing rights, at fair value	168,162	235,402
Other real estate owned, net	31,553	19,198
Other real estate owned related to FDIC-assisted transactions	10,717	19,328
Other assets	297,948	297,690
Total assets	15,585,007	14,602,099
Deposits:
Non-interest bearing	4,627,184	4,118,256
Interest bearing	6,878,031	6,872,686
Total deposits	11,505,215	10,990,942
Short-term borrowings	1,005,737	931,415
Long-term borrowings	400,274	82,916
Junior subordinated notes issued to capital trusts	186,164	185,778
Accrued expenses and other liabilities	400,333	382,762
Total liabilities	13,497,723	12,573,813
STOCKHOLDERS’ EQUITY
Preferred stock, ($0.01 par value, authorized 10,000,000 shares at December 31, 2015 and 2014; Series A, 8% perpetual non-cumulative, 4,000,000 shares issued and outstanding at December 31, 2015 and 2014, $25 liquidation value)	115,280	115,280
Common stock, ($0.01 par value; authorized 100,000,000 shares at December 31, 2015 and 2014; issued 75,566,885 shares at December 31, 2015 and 75,067,482 shares at December 31, 2014)	756	751
Additional paid-in capital	1,280,870	1,267,761
Retained earnings	731,812	629,677
Accumulated other comprehensive income	15,777	20,356
Less: 1,888,556 and 296,715 shares of treasury stock, at cost, at December 31, 2015 and 2014, respectively	(58,504)	(6,974)
Controlling interest stockholders’ equity	2,085,991	2,026,851
Noncontrolling interest	1,293	1,435
Total stockholders’ equity	2,087,284	2,028,286
Total liabilities and stockholders’ equity	$ 15,585,007	$ 14,602,099

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Securities held to maturity, at amortized cost, fair value (in dollars)	$ 1,274,767	$ 1,035,061
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, dividend rate	8.00%	8.00%
Preferred stock, shares issued	4,000,000	4,000,000
Preferred stock, shares outstanding	4,000,000	4,000,000
Preferred stock, liquidation preference per share	$ 25	$ 25
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized shares	100,000,000	100,000,000
Common stock, issued shares	75,566,885	75,067,482
Treasury stock, shares	1,888,556	296,715

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Loans:
Taxable	$ 404,324		$ 292,028		$ 228,931
Nontaxable	9,318		9,022		9,611
Investment securities:
Taxable	39,299		38,619		26,084
Nontaxable	40,974		34,791		32,564
Federal funds sold	1		25		15
Other interest earning accounts	318		663		690
Total interest income	494,234		375,148		297,895
Interest expense:
Deposits	19,658		17,027		19,240
Short-term borrowings	1,412		780		622
Long-term borrowings and junior subordinated notes	7,558		6,518		5,697
Total interest expense	28,628		24,325		25,559
Net interest income	465,606		350,823		272,336
Provision for credit losses	21,386		12,052		(5,804)
Net interest income after provision for credit losses	444,220		338,771		278,140
Non-interest income:
Lease financing, net	76,581		64,310		61,243
Mortgage banking revenue	117,426		46,149		1,664
Commercial deposit and treasury management fees	45,283		34,315		24,867
Trust and asset management fees	23,545		21,839		19,142
Card fees	15,322		13,741		11,013
Capital markets and international banking fees	8,148		5,458		3,560
Consumer and other deposit service fees	13,282		12,788		13,968
Brokerage fees	5,754		5,176		4,907
Loan service fees	6,259		4,814		5,563
Increase in cash surrender value of life insurance	3,391		3,381		3,385
Net loss on investment securities	(176)		(2,525)		(1)
Net (loss) gain on sale of assets	(2)		3,452		(323)
Gain on extinguishment of debt	0		1,895		0
Other operating income	7,280		6,512		5,406
Total non-interest income	322,093		221,305		154,394
Non-interest expenses:
Salaries and employee benefits	343,531		255,974		177,858
Occupancy and equipment expense	50,510		44,910		36,878
Computer services and telecommunication expense	34,453		31,678		18,883
Advertising and marketing expense	10,072		8,854		8,272
Professional and legal expense	11,053		14,652		8,807
Other intangibles amortization expense	6,115		5,501		6,084
Facilities impairment charges	8,515		2,270		0
Net loss (gain) recognized on other real estate owned and other related expense	1,468		3,575		(781)
Prepayment fees on interest bearing liabilities	85		0		0
Other operating expenses	68,352		69,368		38,587
Total non-interest expenses	534,154	[1]	436,782	[1]	294,588
Income before income taxes	232,159		123,294		137,946
Income tax expense	73,211		37,193		39,491
Net income	158,948		86,101		98,455
Dividends on preferred shares	8,000		4,000
Net income available to common stockholders	$ 150,948		$ 82,101		$ 98,455
Common share data:
Basic earnings per common share (dollars per share)	$ 2.03		$ 1.32		$ 1.81
Diluted earnings per common share (dollars per share)	$ 2.02		$ 1.31		$ 1.79
Weighted average common shares outstanding for basic earnings per common share (in shares)	74,177,574		62,012,196		54,509,612
Diluted weighted average common shares outstanding for diluted earnings per common share (in shares)	74,849,030		62,573,406		54,993,865
[1]	Includes merger related expenses of $5.5 million, $34.8 million and $2.5 million in the banking segment for the years ended December 31, 2015, 2014 and 2013, respectively. Also, includes contingent consideration expense related to our acquisition of Celtic Leasing Corp. in the banking segment for the year ended December 31, 2014.

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 158,948	$ 86,101	$ 98,455
Unrealized holding (losses) gains on investment securities, net of reclassification adjustments	(4,078)	20,933	(43,543)
Reclassification adjustment for amortization of unrealized gains on investment securities transferred to held to maturity from available for sale	(3,633)	(3,700)	(2,478)
Reclassification adjustments for losses included in net income	176	2,525	1
Other comprehensive (loss) income, before tax	(7,535)	19,758	(46,020)
Income tax benefit (expense) related to items of other comprehensive (loss) income	2,956	(7,785)	18,077
Other comprehensive (loss) income, net of tax	(4,579)	11,973	(27,943)
Comprehensive income	$ 154,369	$ 98,074	$ 70,512

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income, Net of Tax	Treasury Stock	Noncontrolling Interest
Balance at Dec. 31, 2012	$ 1,275,770	$ 0	$ 550	$ 732,771	$ 507,933	$ 36,326	$ (3,293)	$ 1,483
Increase (Decrease) in Stockholders' Equity
Net income	98,641				98,455			186
Other comprehensive income (loss), net of tax	(27,943)					(27,943)
Cash dividends declared on common shares	(24,290)				(24,290)
Restricted common stock activity, net of tax	887		1	(739)	(100)		1,725
Stock option activity, net of tax	557			58			499
Repurchase of common shares in connection with employee benefit plans and held in trust for deferred compensation plan	(2,171)			507			(2,678)
Stock-based compensation expense	5,456			5,456
Distributions to noncontrolling interest	(225)							(225)
Balance at Dec. 31, 2013	1,326,682	0	551	738,053	581,998	8,383	(3,747)	1,444
Increase (Decrease) in Stockholders' Equity
Net income	86,392				86,101			291
Other comprehensive income (loss), net of tax	11,973					11,973
Issuance of preferred stock	115,280	115,280
Issuance of common stock	518,992		196	518,796
Cash dividends declared on preferred shares	(4,000)				(4,000)
Cash dividends declared on common shares	(34,422)				(34,422)
Restricted common stock activity, net of tax	874		2	812			60
Stock option activity, net of tax	531		2	529
Repurchase of common shares in connection with employee benefit plans and held in trust for deferred compensation plan	(2,690)			597			(3,287)
Stock-based compensation expense	8,974			8,974
Distributions to noncontrolling interest	(300)							(300)
Balance at Dec. 31, 2014	2,028,286	115,280	751	1,267,761	629,677	20,356	(6,974)	1,435
Increase (Decrease) in Stockholders' Equity
Net income	159,206				158,948			258
Other comprehensive income (loss), net of tax	(4,579)					(4,579)
Issuance of common stock	218			218
Cash dividends declared on preferred shares	(8,000)				(8,000)
Cash dividends declared on common shares	(48,813)				(48,813)
Restricted common stock activity, net of tax	1,077		5	(1,804)			2,876
Stock option activity, net of tax	(247)			(247)
Repurchase of common shares	(49,963)						(49,963)
Repurchase of common shares in connection with employee benefit plans and held in trust for deferred compensation plan	(3,624)			819			(4,443)
Stock-based compensation expense	14,123			14,123
Distributions to noncontrolling interest	(400)							(400)
Balance at Dec. 31, 2015	$ 2,087,284	$ 115,280	$ 756	$ 1,280,870	$ 731,812	$ 15,777	$ (58,504)	$ 1,293

CONSOLIDATED STATEMENTS OF CHA7

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Stockholders' Equity [Abstract]
Cash dividends declared (in dollars per share)	$ 0.65	$ 0.52	$ 0.44

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash Flows From Operating Activities
Net income	$ 158,948	$ 86,101	$ 98,455
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of premises and equipment and leased equipment	61,562	60,067	51,893
Facilities impairment charges	8,515	2,270	0
Compensation expense for share-based payment plans	14,123	8,974	5,456
Loss (gain) on sales of premises and equipment and leased equipment	2,446	(5,817)	362
Amortization of other intangibles	6,115	5,501	6,084
Provision for credit losses	21,386	12,052	(5,804)
Deferred income tax expense	39,573	(48)	21,681
Amortization of premiums and discounts on investment securities, net	48,670	45,413	47,771
Accretion of premiums and discounts on loans, net	(36,651)	(21,262)	(7,122)
Accretion of FDIC indemnification asset	(96)	(112)	(342)
Net loss on investment securities	176	2,525	1
Proceeds from sale of loans held for sale	6,817,330	2,213,914	86,505
Origination of loans held for sale	(6,818,125)	(2,266,636)	(77,935)
Net gain on sale of loans held for sale	(34,075)	(12,022)	(1,664)
Change in fair value of mortgage servicing rights	33,648	11,777	0
Net loss (gain) on other real estate owned	1,814	1,554	(1,888)
Net (gain) loss on other real estate owned related to FDIC-assisted transactions	(845)	446	360
Increase in cash surrender value of life insurance	(3,391)	(3,381)	(3,385)
Gain on extinguishment of debt	0	(1,895)	0
(Increase) decrease in other assets, net	(78,334)	9,988	17,485
(Decrease) increase in other liabilities, net	(37,513)	18,038	(45,155)
Net cash provided by operating activities	205,276	167,447	192,758
Cash Flows From Investing Activities
Decrease (increase) in federal funds sold	0	42,950	(42,950)
Proceeds from sales of investment securities available for sale	28,356	512,878	989
Proceeds from maturities and calls of investment securities available for sale	284,895	259,694	496,258
Purchase of investment securities available for sale	(276,664)	(216,777)	(484,113)
Proceeds from maturities and calls of investment securities held to maturity	83,061	41,654	17,087
Purchase of investment securities held to maturity	(339,454)	(122,859)	(61,073)
Purchase of non-marketable securities - FHLB and FRB stock	(58,664)	(15)	(547)
Redemption of non-marketable securities - FHLB and FRB stock	20,000	26,483	4,515
Net (increase) decrease in loans	(663,235)	155,399	38,725
Purchases in mortgage servicing rights	(823)	(1,096)	0
Proceeds from sale of mortgage servicing rights	103,105	0	0
Purchases of premises and equipment and leased equipment	(111,124)	(94,667)	(65,453)
Proceeds from sales of premises and equipment and leased equipment	5,374	22,924	8,532
Capital improvements on other real estate owned	0	0	(74)
Proceeds from sale of other real estate owned	7,407	9,390	21,814
Proceeds from sale of other real estate owned related to FDIC-assisted transactions	16,091	17,049	15,194
Life insurance death benefit	0	0	2,083
Net cash (paid) acquired in business acquisition	(18,935)	25,174	0
Net (payments for) proceeds from FDIC related covered assets	(11,483)	(3,620)	9,766
Net cash (used in) provided by investing activities	(932,093)	674,561	(39,247)
Cash Flows From Financing Activities
Net increase (decrease) in deposits	514,273	(343,530)	(161,438)
Net increase (decrease) in short-term borrowings	73,716	(597,774)	272,787
Proceeds from long-term borrowings	339,590	33,816	7,725
Principal paid on long-term borrowings	(22,232)	(13,059)	(61,616)
Redemption of junior subordinated notes issued to capital trusts	0	(45,369)	0
Treasury stock transactions, net	(53,587)	(2,690)	(1,672)
Stock options exercised	499	1,034	1,014
Excess tax benefits from share-based payment arrangements	331	396	(325)
Dividends paid on preferred stock	(8,000)	(2,000)	0
Dividends paid on common stock	(48,413)	(34,210)	(24,070)
Net cash provided by (used in) financing activities	796,177	(1,003,386)	32,405
Net increase (decrease) in cash and cash equivalents	69,360	(161,378)	185,916
Cash and cash equivalents:
Beginning of year	312,081	473,459	287,543
End of year	381,441	312,081	473,459
Cash payments for:
Interest paid to depositors and other borrowed funds	29,151	25,258	26,345
Net income tax payments, net	8,138	23,040	35,375
Supplemental Schedule of Noncash Investing Activities:
Investment securities held to maturity purchased not settled	761	0	321
Transfer of investment securities available for sale to investment securities held to maturity	0	0	656,617
Transfer of investment securities held to maturity to investment securities available for sale	0	273,471	0
Loans held for sale transferred to loans held for investment	33,613	0	0
Loans transferred to other real estate owned	21,576	2,133	6,164
Loans transferred to other real estate owned related to FDIC-assisted transactions	4,607	16,337	16,023
Loans transferred to repossessed vehicles	928	1,019	871
Operating leases rewritten as direct finance leases included as loans	7,666	5,853	6,936
Noncash assets acquired:
Investment securities available for sale	0	826,691	0
Investment securities held to maturity	0	22,599	0
Non-marketable securities -FHLB and FRB stock	0	50,620	0
Loans held for sale	0	670,671	0
Loans	0	3,532,211	0
Lease investments	0	11,885	0
Premises and equipment	519	19,701	0
Goodwill	13,549	288,152	0
Other intangibles	8,838	20,079	0
Mortgage servicing rights	0	224,453	0
Other real estate owned	0	4,720	0
Other assets	744	130,478	0
Total noncash assets acquired	23,650	5,802,260	0
Liabilities assumed:
Deposits	0	3,953,213	0
Short-term borrowings	606	1,035,800	0
Junior subordinated notes issued to capital trusts	0	80,843	0
Other liabilities	4,109	123,028	0
Total liabilities assumed	$ 4,715	$ 5,192,884	$ 0

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Significant Accounting Policies	Significant Accounting Policies MB Financial, Inc. (the "Company," "we," "us," "our") is a financial holding company that provides a full range of financial services to individuals and corporate customers through its banking subsidiary, MB Financial Bank, N.A. ("MB Financial Bank"). The Company’s primary market is the Chicago, Illinois metropolitan area, in which MB Financial Bank operates 80 banking offices through MB Financial Bank. MB Financial Bank, our largest subsidiary, has four wholly owned subsidiaries with significant operating activities: LaSalle Systems Leasing, Inc., Celtic Leasing Corp., MB Equipment Finance, LLC and MSA Holdings, LLC, which MB Financial Bank acquired on December 31, 2015. MB Financial Bank also has a majority owned subsidiary with significant operating activities, Cedar Hill Associates, LLC. Basis of Financial Statement Presentation: The consolidated financial statements include the accounts of the Company and its subsidiaries. Significant intercompany items and transactions have been eliminated in consolidation. The accounting and reporting policies of the Company conform to accounting principles generally accepted in the United States of America and general practices within the financial services industry. In accordance with applicable accounting standards, the Company does not consolidate statutory trusts established for the sole purpose of issuing trust preferred securities and related trust common securities. See Note 12 below for more detail. In preparing the financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheet and revenues and expenses for the year. Actual results could differ from those estimates. Areas involving the use of management’s estimates and assumptions, which are more susceptible to change in the near term include the allowance for loan and lease losses; residual value of direct finance, leveraged, and operating leases; valuation of mortgage servicing rights; income tax accounting; fair value measurements for assets and liabilities; and goodwill. Cash and cash equivalents: For purposes of reporting cash flows, cash and cash equivalents includes cash on hand, amounts due from banks (including cash items in process of clearing), interest-bearing deposits with banks, with original maturities of 90 days or less. Investment securities: Securities classified as available for sale are those securities that the Company intends to hold for an indefinite period of time, but not necessarily to maturity. Any decision to sell a security classified as available for sale is based on various factors, including movements in interest rates, changes in the maturity mix of assets and liabilities, liquidity needs, regulatory capital considerations, and other factors. Securities available for sale are reported at fair value with unrealized gains or losses reported as accumulated other comprehensive income, net of the related deferred tax effect. Securities classified as held to maturity are those securities that the Company intends to hold until maturity and are reported at amortized cost. The historical cost of debt securities is adjusted for amortization of premiums and accretion of discounts over the estimated life of the security, using the level-yield method. In determining the estimated life of a mortgage-related security, certain judgments are required as to the timing and amount of future principal prepayments. These judgments are made based upon the actual performance of the underlying security and the general market consensus regarding changes in mortgage interest rates and underlying prepayment estimates. Amortization of premium and accretion of discount is included in interest income from the related security. Realized gains or losses, determined on the basis of the cost of specific securities sold, are included in earnings. The Company evaluates the portfolio for impairment each quarter. In estimating other-than-temporary losses, the Company considers the length of time and the extent to which the fair value has been less than cost, the financial condition and near-term prospects of the issuer, and whether the Company is more likely than not to sell the security before recovery of its cost basis. If the Company intends to sell an impaired security, the Company records an other-than-temporary loss in an amount equal to the entire difference between the fair value and amortized cost. If a security is determined to be other-than-temporarily impaired, but the Company does not intend to sell the security, only the credit portion of the estimated loss is recognized in earnings, with the other portion of the loss recognized in other comprehensive income. Federal Home Loan Bank and Federal Reserve Bank stock: The Company owns investments in the stock of the Federal Reserve Bank of Chicago (“FRB”) and the Federal Home Loan Bank of Chicago (“FHLB”). No ready market exists for these stocks, and they have no quoted market values. The Bank, as a member of the Federal Reserve System and the FHLB, is required to maintain an investment in the capital stock of the FRB and FHLB. The stock is redeemable at par by the FRB and FHLB, respectively, and is, therefore, carried at cost and periodically evaluated for impairment. Loans held for sale: Mortgage loans originated and intended for sale in the secondary market are reflected at fair value. Changes in the fair value are recognized in mortgage banking revenue on the Company's Consolidated Statements of Operations. Mortgage Loan Representation and Warranty Reserve: The Company originates and sells residential mortgage loans in the secondary market. When the Company sells mortgage loans, it makes customary representations and warranties to the purchasers about various characteristics of each loan, such as the ownership of the loan, the validity of the lien securing the loan, the nature and extent of underwriting standards applied and the types of documentation being provided. These representations and warranties are generally enforceable over the life of the loan. If a defect in the origination process is identified, the Company may be required to either repurchase the loan or indemnify the purchaser for losses it sustains on the loan. If there are no such defects, the Company has no liability to the purchaser for losses it may incur on such loans. The Company maintains a representation and warranty reserve to account for the expected losses related to loans it might be required to repurchase or the indemnity payments it may have to make to purchasers. The representation and warranty reserve reflects management's best estimate of probable lifetime loss. The reserve considers both the estimate of expected losses on loans sold during the current accounting period as well as adjustments to the Company's previous estimate of expected losses on loans sold. Factors considered include borrower performance, repurchase demand behavior, and historical loan defect experience. Management monitors the adequacy of the overall reserve and makes adjustments to the level of reserve, as necessary, after consideration of other qualitative factors. At the time a loan originated for sale is funded, the representation and warranty reserve is recorded as a decrease in mortgage banking revenue on the Consolidated Statements of Operations and recorded in accrued interest, taxes and other liabilities on the Company's Consolidated Balance Sheets. Changes to the reserve are recorded as an increase or decrease to mortgage banking revenue on the Consolidated Statements of Operations. Loans and leases: Loans are stated at the amount of unpaid principal reduced by the allowance for loan and lease losses and unearned income. Direct finance and leveraged leases are included as lease loans for financial statement purposes. Direct finance leases are stated as the sum of remaining minimum lease payments from lessees plus estimated residual values less unearned lease income. Leveraged leases are stated at the sum of remaining minimum lease payments from lessees (less nonrecourse debt payments) plus estimated residual values less unearned lease income. On a quarterly basis, management reviews the lease residuals for potential impairment. Unearned lease income on direct finance and leveraged leases is recognized over the lives of the leases using the level-yield method. Loan origination and commitment fees and certain direct loan origination costs are deferred and the net amount amortized as an adjustment of the related loan’s yield. The Company is amortizing these amounts over the contractual life of the loan. Commitment fees based upon a percentage of a customer’s unused line of credit and fees related to standby letters of credit are recognized over the commitment period. Interest income is accrued daily on the Company’s outstanding loan balances. The accrual of interest on loans is discontinued at the time the loan is 90 days past due unless the credit is well-secured and in process of renewal or collection. Past due status is based on contractual terms of the loan. In all cases, loans are placed on non-accrual or charged-off at an earlier date if collection of principal or interest is considered doubtful. All interest accrued but not collected for loans that are placed on non-accrual or charged-off is reversed against interest income. For impaired loans, accrual of interest is discontinued on a loan when management believes, after considering collection efforts and other factors, the borrower’s financial condition is such that collection of interest is doubtful. Cash collections on impaired loans are generally credited to the loan balance, and no interest income is recognized on those loans until the principal balance has been determined to be collectible. Loans, other than those included in large groups of smaller-balance homogeneous loans, are considered impaired when it is probable the Company will be unable to collect all contractual principal and interest payments due in accordance with the terms of the loan agreement. Impaired loans include non-accrual loans and loans classified as a troubled debt restructuring. Impaired loans are measured based on the present value of expected future cash flows discounted at the loan’s effective interest rate or, as a practical expedient, based on the loan’s observable market price or the fair value of the collateral if the loan is collateral dependent. The amount of impairment, if any and any subsequent changes are charged against the allowance for loan and lease losses. Troubled debt restructurings: A loan is classified as a troubled debt restructuring when a borrower is experiencing financial difficulties that leads to a restructuring of the loan, and the Company grants concessions to the borrower in the restructuring that it would not otherwise consider. These concessions may include rate reductions, principal forgiveness, deferral of past due interest or principal, extension of maturity date, modification of amortization schedules, redemption of past due taxes and other actions intended to minimize potential losses. In determining whether a debtor is experiencing financial difficulties, the Company considers if the debtor is in payment default or would be in payment default in the foreseeable future without the modification, the debtor declared or is in the process of declaring bankruptcy, there is substantial doubt that the debtor will continue as a going concern, the debtor has securities that have been or are in the process of being delisted, the debtor’s entity-specific projected cash flows will not be sufficient to service any of its debt, or the debtor cannot obtain funds from sources other than the existing creditors at a market rate for debt with similar risk characteristics. In determining whether the Company has granted a concession, the Company assesses, if it does not expect to collect all amounts due, whether the current value of the collateral will satisfy the amounts owed, whether additional collateral or guarantees from the debtor will serve as adequate compensation for other terms of the restructuring, and whether the debtor otherwise has access to funds at a market rate for debt with similar risk characteristics. A loan that is modified at a market rate of interest will not be classified as troubled debt restructuring in the calendar year subsequent to the restructuring if it is in compliance with the modified terms. Payment performance prior and subsequent to the restructuring is taken into account in assessing whether it is likely that the borrower can meet the new terms. Under certain circumstances, a loan may be returned to accrual at the time of restructuring. A period of sustained repayment for at least six months generally is required for return to accrual status. 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 non-performing) through the calendar year of the restructuring that the historical payment performance has been established. Allowance for loan and lease losses: The allowance for loan and lease losses (ALLL) is established through a provision for credit losses charged to expense. Loans are charged against the ALLL when management believes that collectability of the principal is unlikely. The allowance is an amount that management believes will be appropriate to absorb probable losses on existing loans, based on an evaluation of the collectability of loans and prior loss and recovery experience as appropriate under GAAP. The ALLL is based on management’s evaluation of the loan portfolio giving consideration to the nature and volume of the loan portfolio, the value of underlying collateral, overall portfolio quality, review of specific problem loans, and prevailing economic conditions that may affect the borrower’s ability to pay. While management uses the best information available to make its evaluation, future adjustments to the allowance may be necessary if there are significant changes in economic conditions. In addition, regulatory agencies, as an integral part of their examination process, periodically review MB Financial Bank’s ALLL, and may require it to recognize adjustments to its allowance based on their judgments of information available to them at the time of their examinations. The ALLL is comprised of three elements: a commercial related general loss reserve; a commercial related specific reserve for impaired loans; and a consumer related reserve for smaller-balance homogenous loans. Each element is discussed below. Commercial Related General Loss Reserve - We maintain a general loan loss reserve for the four categories of commercial related loans in our portfolio - commercial loans, commercial loans collateralized by the assignment of lease payments (lease loans), commercial real estate loans and construction real estate loans. Under our loan risk rating system, each loan, with the exception of those included in large groups of smaller-balance homogeneous consumer related loans, is risk rated between one and nine by the originating loan officer, Senior Credit Management, Loan Review or loan committee. Loans rated "one" represent those loans least likely to default and a loan rated " nine " represents a loss. The probability of loans defaulting for each risk rating, sometimes referred to as default factors, are estimated based on the frequency with which loans migrate from one risk rating to another and to default status over time. We use a loan loss reserve model that incorporates the migration of loan risk ratings and historical default data over a multi-year period to develop our estimated default factors (EDFs). The model tracks annual loan rating migrations by loan type and currently uses loan risk rating migrations for 15 years. The migration data is adjusted by using average losses for an economic cycle (approximately 14 years) to develop EDFs by loan type, risk rating and maturity. EDFs are updated annually in December. EDFs are multiplied by individual loan balances in each risk-rating category and again multiplied by an historical loss given default estimate for each loan type (which incorporates estimated recoveries) to determine the appropriate allowance by loan type. This approach is applied to the commercial, lease, commercial real estate, and construction real estate components of the portfolio. To account for current economic conditions, the general allowance for loan and lease losses also includes adjustments for macroeconomic factors. Macroeconomic factors adjust the ALLL upward or downward based on the current point in the economic cycle using predictive economic data and are applied to the loan loss model through a separate allowance element for the commercial, commercial real estate, construction real estate and lease loan components. To determine our macroeconomic factors, we use specific economic data that has shown to be a statistically reliable predictor of our credit losses relative to our long term average credit losses. We tested over 20 economic variables (U.S. manufacturing index, unemployment rate, U.S. GDP growth, etc.). We annually review this data to determine that such a relationship continues to exist. We currently use the following macroeconomic indicators in our macroeconomic factor computation: Commercial loans and lease loans: total industry capacity utilization, our prior period charge-off rates and the yield on BBB-rated debt. Commercial real estate loans and construction loans: M2 Money stock, our prior period charge-off rates, the U.S. commercial real estate index and the contribution of the commercial mortgage-backed security spread to the Cleveland Financial Stress Index. Using the indicators noted above, a predicted charge-off percentage is calculated. The predicted charge-off percentage is then compared to the cycle average charge-off percentage, and a macroeconomic adjustment factor is calculated. The macroeconomic adjustment factor is applied to each commercial loan type. Each year, we review the predictive nature of the macroeconomic factors by comparing actual charge-offs to the predicted model charge-offs, re-run our regression analysis and re-calibrate the macroeconomic factors as appropriate. Commercial Related Specific Reserves - The ALLL also includes specific reserves on impaired commercial related loans. A loan is considered to be impaired when management believes, after considering collection efforts and other factors, the borrower’s financial condition is such that the collection of all contractual principal and interest payments due is doubtful. At each quarter-end, impaired loans are reviewed individually, with adjustments made to the general calculated reserve for each loan as deemed necessary. Specific adjustments are made depending on expected cash flows and/or the value of the collateral securing each loan. Generally, the Company obtains a current external appraisal (within 12 months) on real estate secured impaired loans. Our appraisal policy is designed to comply with the Interagency Appraisal and Evaluation Guidelines, most recently updated in December 2010. As part of our compliance with these guidelines, we maintain an internal Appraisal Review Department that engages and reviews all third party appraisals. In addition, each impaired commercial loan with real estate collateral is reviewed quarterly by our appraisal department to determine that the most recent valuation remains appropriate during subsequent quarters until the next appraisal is received. If considered necessary by our appraisal department, the appraised value may be further discounted to reflect current values. Other valuation techniques are also used to value non-real estate assets. Discounts may be applied in the impairment analysis used for general business assets (GBA). Examples of GBA include accounts receivable, inventory, and any marketable securities pledged. The discount is used to reflect collection risk in the event of default that may not have been included in the valuation of the asset. Consumer Related Reserves - Pools of homogeneous loans with similar risk and loss characteristics are also assessed for probable losses. These loan pools include consumer, residential real estate, home equity, credit cards and indirect vehicle loans. Migration probabilities obtained from past due roll rate analyses and historical loss rates are applied to current balances to forecast charge-offs over a one -year time horizon. We consistently apply our methodology for determining the appropriateness of the allowance for loan and lease losses but may adjust our methodologies and assumptions based on historical information related to charge-offs and management's evaluation of the loan portfolio. In this regard, we periodically review the following to validate our allowance for loan and lease losses: historical net charge-offs as they relate to prior periods' allowance for loan and lease loss, comparison of historical loan migration in past years compared to the current year, overall credit trends and ratios and any significant changes in loan concentrations. In reviewing this data, we adjust qualitative factors within our allowance methodology to appropriately reflect any changes warranted by the validation process. Acquired loans: 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 and lease 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 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. For pass rated loans (non-purchased credit-impaired loans), the difference between the estimated fair value of the loans (computed on a loan by loan basis) and the principal outstanding is accreted over the remaining life of the loans. The Company anticipates recording a provision for the acquired portfolio in future quarters related to renewing Taylor loans which will offset a substantial portion of the accretion from the pass rated loans. In accordance with ASC 310-30, for both purchased non-impaired loans and purchased impaired loans ("PCI 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. Lease investments: The Company’s investment in operating leases is reported as lease investments, net. Rental income on operating leases is recognized as income over the lease term according to the provisions of the lease, which is generally on a straight-line basis. The investment in equipment in operating leases is stated at cost less depreciation using the straight-line method generally over a life of five years or less. Premises and equipment: Premises and equipment are carried at cost less accumulated depreciation and amortization. Depreciation and amortization is computed by the straight-line method over the estimated useful lives of the assets. Useful lives generally range from three to seven years for computer equipment and software, five to 10 years for furniture and equipment, and five to 39 years for buildings and building improvements. Land improvements are amortized over a period of 15 years and leasehold improvements are amortized over the term of the related lease or the estimated useful lives of the improvements, whichever is shorter. Land is not subject to depreciation. Maintenance and repairs are charged to expense as incurred, while major improvements are capitalized and amortized to operating expense over their identified useful lives. Premises and equipment and other long-lived assets are tested for impairment whenever events or changes in circumstances indicate the carrying amount of the assets may not be recoverable from future undiscounted cash flows. If impaired, the assets are recorded at fair value. Assets acquired through a business acquisition are recorded at fair value as of the acquisition date. Other real estate owned: Other real estate owned includes real estate assets that have been received in satisfaction of debt. Other real estate owned is initially recorded at fair value less estimated selling costs, which establishes the cost basis. Subsequently, other real estate owned is carried at the lower of the cost basis or fair value less estimated selling costs. Any valuation adjustments required at the date of transfer are charged to the allowance for loan and lease losses. Subsequently, unrealized losses and realized gains and losses on sale are included in net loss recognized on other real estate owned. Cash surrender value of life insurance: The Company has purchased bank-owned life insurance policies on certain executives. Bank-owned life insurance is recorded at its cash surrender value. Changes in the cash surrender values are included in non-interest income. Goodwill : 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 the provisions of ASC Topic 350, goodwill is subject to at least annual assessments for impairment by applying a fair value based test. The Company reviews goodwill and other intangible assets to determine potential impairment annually, or more frequently if events and circumstances indicate that the asset might be impaired, by comparing the carrying value of the asset with the anticipated future cash flows. The Company's annual assessment is done at the unit level. As of December 31, 2015 , the annual assessment date, the Company had three reporting units: banking, leasing and mortgage banking. The Company did not recognize impairment losses during the year ended December 31, 2015 . Other intangibles : The Company’s other intangible assets consist of core deposit and customer intangibles obtained through acquisitions. Core deposit intangibles (the portion of an acquisition purchase price which represents value assigned to the existing deposit base) have finite lives and are amortized by a 150% declining balance method over four to 20 years. Other intangible assets are tested for impairment whenever events or changes in circumstances indicate that the carrying amount of the assets may not be recoverable from future undiscounted cash flows. If impaired, the assets are recorded at fair value. Mortgage Servicing Rights : The Company originates and sells residential mortgage loans in the secondary market and may retain the right to service the loans sold. Servicing involves the collection of payments from individual borrowers and the distribution of those payments to the investors. Upon a sale of mortgage loans for which servicing rights are retained, the retained mortgage servicing rights asset is capitalized at the fair value of future net cash flows expected to be realized for performing servicing activities. Purchased mortgage servicing rights are recorded at the purchase price at the date of purchase and at fair value thereafter. Mortgage servicing rights do not trade in an active market with readily observable prices. The Company determines the fair value of mortgage servicing rights by estimating the fair value of the future cash flows associated with the mortgage loans being serviced. Key economic assumptions used in measuring the fair value of mortgage servicing rights include, but are not limited to, prepayment speeds, discount rates, delinquencies and cost to service. The assumptions used in the valuation model are validated on a periodic basis. The fair value is validated on a quarterly basis with an independent third party. The Company has elected to account for mortgage servicing rights using the fair value option. Changes in the fair value are recognized in mortgage banking revenue on the Company's Consolidated Statements of Operations. FDIC indemnification asset : As part of the Heritage Community Bank ("Heritage"), Benchmark Bank ("Benchmark"), Broadway Bank ("Broadway"), and New Century Bank ("New Century") transactions, MB Financial Bank entered into loss-share agreements with the FDIC. These agreements cover realized losses on loans and foreclosed real estate for specified periods. See Note 5 below for more information on these agreements, including the duration of MB Financial Bank’s loss-share coverage. These loss-share assets are measured separately from the loan portfolios because they are not contractually embedded in the loans and are not transferable with the loans should MB Financial Bank choose to dispose of them. Fair values at the acquisition dates were estimated based on projected cash flows available for loss-share based on the credit adjustments estimated for each loan pool and the loss-share percentages. The loss-share assets are also separately measured from the related loans and foreclosed real estate and recorded within other assets on the balance sheet. The corresponding accretion is recorded in other income on the statement of operations. Although these assets are contractual receivables from the FDIC, there are no contractual interest rates. When cash flow estimates are adjusted downward for a particular loan pool, the FDIC indemnification asset is increased. An allowance for loan and lease losses is established for the impairment of the loans. A provision for credit 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 claw-back liability for amounts owed to the FDIC for better than expected performance will increase or decrease accordingly. Preferred stock: Preferred stock issued in connection with the Taylor Capital Group, Inc. merger was initially recorded at fair value. Preferred dividends declared are deducted from net income for computing net income available to common stockholders and earnings per common share computations. Treasury stock: Treasury stock is recorded at acquisition cost.

Business Combinations

Business Combinations	12 Months Ended
	Dec. 31, 2015
Business Combinations [Abstract]
Business Combinations	Business Combinations Taylor Capital Group, Inc. On August 18, 2014, the Company acquired Taylor Capital Group, Inc. (“Taylor Capital”), a bank holding company and the parent company of Cole Taylor Bank, a commercial bank headquartered in Chicago, through the merger (the “Merger”) of Taylor Capital with and into the Company, followed immediately by the merger of Cole Taylor Bank with and into MB Financial Bank. This transaction solidifies the Company's market position in Chicago and diversifies its revenue streams. At the effective time of the Merger (the “Effective Time”), each share of the common stock of Taylor Capital and each share of nonvoting convertible preferred stock of Taylor Capital converted into the right to receive (1) 0.64318 of a share of the common stock of the Company, and (2) $4.08 in cash. All “in-the-money” Taylor Capital stock options and warrants outstanding immediately prior to the Effective Time were canceled in exchange for the right to receive a cash payment as provided in the merger agreement, as were the outstanding unvested restricted stock awards of Taylor Capital; however, the cash consideration payable 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, converted into the right to receive one share of the Company’s perpetual non-cumulative preferred stock, Series A. The Company issued approximately 19.6 million shares of common stock and paid approximately $129.5 million in cash in the Merger. For the “in-the-money” Taylor Capital stock options and warrants, the Company paid in the aggregate approximately $4.4 million in cash. For the outstanding unvested Taylor Capital restricted stock awards, the Company will pay or has paid in the aggregate up to approximately $3.7 million in cash, as and to the extent such awards vest. The $129.5 million cash consideration includes payments for the Taylor Capital stock options, warrants and restricted stock awards. This business combination was accounted for under the acquisition method of accounting. Accordingly, the results of operations of the acquired company have been included in the Company’s results of operations since the date of acquisition. Under this method of accounting, the assets acquired, liabilities assumed and consideration paid are recorded at their estimated fair values. The excess cost over fair value of net assets acquired is recorded as goodwill. In the event that the fair value of net assets acquired exceeds the cost, the Company will record a gain on the acquisition. As the consideration paid for Taylor Capital exceeded the net assets acquired, goodwill of $288.2 million was recorded on the acquisition and allocated to the banking segment. Goodwill recorded in the transaction, which reflects the increased Chicago market share and related synergies expected from the combined operations, is not tax deductible. The amounts recognized for the business combination in the financial statements have been determined to be final as of March 31, 2015. Estimated fair values of the assets acquired and liabilities assumed in the Taylor Capital transaction, as of the closing date of the transaction were as follows (in thousands): August 18, 2014 ASSETS Cash and cash equivalents $ 154,684 Investment securities available for sale 826,691 Investment securities held to maturity 22,599 Non-marketable securities - FRB and FHLB Stock 50,620 Loans held for sale 670,671 Loans 3,532,211 Leases investments, net 11,885 Premises and equipment 19,701 Goodwill 288,152 Core deposit intangible 20,079 Mortgage servicing rights 224,453 Other real estate owned 4,720 Other assets 130,478 Total assets $ 5,956,944 LIABILITIES Deposits $ 3,953,213 Short-term borrowings 1,035,800 Junior subordinated notes issued to capital trusts 80,843 Accrued expenses and other liabilities 123,028 Total liabilities $ 5,192,884 Series A preferred stock at $28.82 per share at August 15, 2014 $ 115,280 Total identifiable net assets less Series A preferred stock $ 648,780 Consideration excluding Series A preferred stock: Market value of common stock at $26.49 per share at August 15, 2014 (19,602,482 shares of common stock issued) $ 519,270 Cash paid 129,510 Total fair value of consideration, excluding Series A preferred stock $ 648,780 The Company's Series A preferred stock was valued based upon the closing price of Taylor Capital's Series A preferred stock on August 15, 2014, the last trading day before the merger date. 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 and lease 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 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. For pass rated loans (non-purchased credit-impaired loans), the difference between the estimated fair value of the loans (computed on a loan by loan basis) and the principal outstanding is accreted over the remaining life of the loans. We anticipate recording a provision for the acquired portfolio in future quarters related to renewing Taylor Capital loans which will offset the accretion from the pass rated loans. In accordance with ASC 310-30, for both purchased non-impaired loans and purchased credit-impaired loans ("PCI loans"), the loans are pooled by loan type and 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 pools when there is a reasonable expectation about the amount and timing of such cash flows. The following table presents the acquired loans as of the acquisition date (in thousands): PCI Loans Non-PCI Loans Contractually required principal and interest payments $ 244,650 $ 3,707,463 Contractually required interest payments not expected to be collected due to estimated prepayments — (302,329 ) Nonaccretable difference (34,219 ) — Cash flows expected to be collected 210,431 3,405,134 Accretable difference (5,626 ) (77,728 ) Fair value of acquired loans $ 204,805 $ 3,327,406 The Company incurred costs of $7.1 million and $2.4 million to directly consummate the merger for the years ended December 31, 2014 and 2013, respectively, which is recorded in professional and legal fees on the statement of operations. The Company recorded $34.8 million and $2.5 million in pre-tax merger related expenses for the years ended December 31, 2014 and 2013, respectively. The remainder of the merger related expenses primarily relate to retention and severance compensation costs and service contract termination costs. The data processing systems were converted in September 2014. The following table provides the unaudited pro forma information for the results of operations for the years ended December 31, 2014 and 2013, as if the acquisition had occurred January 1, 2013. The pro forma results combine the historical results of Taylor Capital into the Company's consolidated statement of income including the impact of certain acquisition accounting adjustments including loan discount accretion, investment securities discount accretion, intangible assets amortization, deposit premium accretion and borrowing discount amortization. The pro forma results have been prepared for comparative purposes only and are not necessarily indicative of the results that would have been obtained had the acquisition actually occurred on January 1, 2013. No assumptions have been applied to the pro forma results of operations regarding possible revenue enhancements, provision for credit losses, expense efficiencies or asset dispositions. The merger related expenses that have been recognized are included in net income in the table below. For Years Ended December 31, 2014 2013 (in thousands) Total revenues (net interest income plus non-interest income) $ 774,778 $ 790,655 Net income 112,220 180,085 Revenues and earnings of the acquired company since the acquisition date have not been disclosed as it is not practicable as Taylor Capital was merged into the Company and separate financial information is not readily available. MSA, Holding, LLC On December 31, 2015, MB Financial Bank acquired a 100% equity interest in MSA Holdings, LLC, ("MSA") the parent company of MainStreet Investment Advisors, LLC and Cambium Asset Management, LLC. Main Street Advisors provides investment management solutions to the bank trust and independent trust company markets. Through its Registered Investment Advisor, Cambium LLC, MSA provides efficient, cost-effective account management solutions on a discretionary basis for high net worth clients, both individuals and institutions, and small accounts through its BluePrint portfolio solution. This business combination was accounted for under the acquisition method of accounting. Accordingly, the results of operations of the acquired company will be included in the Company’s results of operations starting on January 1, 2016. Under this method of accounting, assets and liabilities acquired are recorded at their estimated fair values, net of applicable income tax effects. The excess cost over fair value of net assets acquired was recorded as goodwill. The Company recorded $13.5 million in goodwill and $8.8 million in other intangibles as a result of this acquisition. The amounts recognized for the business combination in the financial statements have not been determined to be final as of December 31, 2015. American Chartered Bancorp, Inc. On November 20, 2015, the Company and American Chartered Bancorp, Inc. ("American Chartered") entered into an agreement and plan of merger whereby the Company will acquire American Chartered. The Merger Agreement provides that, upon the terms and subject to the conditions set forth therein, American Chartered will merge with and into the Company, with the Company as the surviving corporation in the merger. Immediately following the merger, American Chartered's wholly owned bank subsidiary, American Chartered Bank, will merge with and into the Company's wholly owned bank subsidiary, MB Financial Bank. American Chartered Bank is a commercial bank that operates 15 banking offices in the Chicago area and, as of December 31, 2015, had approximately $2.8 billion in total assets, $2.0 billion in loans, and $2.3 billion in deposits. Subject to the terms and conditions of the merger agreement, each share of American Chartered common stock that is outstanding immediately prior to the merger, other than shares held by persons who have perfected dissenters' rights under Illinois law and any shares owned by the Company or American Chartered, will be converted into the right to receive, subject to the election and the proration and allocation procedures set forth in the merger agreement: (1) cash consideration in the amount of $9.30 or (2) stock consideration consisting of 0.2732 shares of the Company's common stock, with cash paid in lieu of fractional Company shares determined by multiplying the fractional Company share amount by the average closing sale price of the Company's common stock for the five full trading days ending on the day preceding the merger closing date. Holders of American Chartered common stock also can elect to receive a combination of the cash consideration and stock consideration for their shares, subject to the proration and allocation procedures. The holders of American Chartered’s 8% Cumulative Voting Convertible Preferred Stock, Series D (“American Chartered Series D preferred stock”) and American Chartered’s Non-Voting Perpetual Preferred Stock, Series F (“American Chartered Series F preferred stock” and together with the American Chartered Series D preferred stock, the “American Chartered preferred stock”) have the right, pursuant to the terms of the American Chartered preferred stock and the merger agreement, to elect to receive the same consideration in the merger as the holders of American Chartered common stock (including the right to elect to receive the cash consideration, the stock consideration or a combination of both, subject to the proration and allocation provisions of the merger agreement). In the case of American Chartered Series D preferred stock, this right is based on the number of shares of American Chartered common stock into which each share of American Chartered Series D preferred stock would otherwise then be convertible. Any share of American Chartered preferred stock that has not been converted into American Chartered common stock prior to the merger, or that will not be converted into the right to receive the same consideration in the merger as the holders of American Chartered common stock as described above, will be converted into the right to receive one share of a newly designated series of preferred stock of MB Financial with terms that are not materially less favorable to the holder than the applicable series of American Chartered preferred stock. Concurrent with the execution of the merger agreement, each holder of American Chartered Series F non-voting preferred stock irrevocably elected and agreed to receive the same consideration in the merger as the holders of American Chartered common stock and waived any rights that such holder might otherwise have had to receive shares of preferred stock of the Company in the merger. The holder of each vested American Chartered stock option that is outstanding immediately prior to the merger will have the right to elect to receive, for the holder's "net option shares," the cash consideration, the stock consideration or a combination of both, subject to the proration and allocation provisions of the merger agreement. The number of "net option shares" per vested option will be determined by dividing (A) (i) the excess, if any, of $9.30 over the per share exercise price of the option, multiplied by (ii) the number of shares subject to the option, by (B) $9.30 . Each unvested American Chartered stock option that is outstanding immediately prior to the merger will be assumed by the Company and converted into the right to receive an option to purchase shares of the Company's common stock, with adjustments to the number of shares underlying the option (determined by multiplying the pre-merger number of option shares by 0.2732 , and rounding down to the nearest whole number of shares of the Company's common stock) and the per share exercise price of the option (determined by dividing the pre-merger exercise price by 0.2732 , and rounding up to the nearest whole cent). Each American Chartered restricted stock award that is outstanding immediately prior to the merger will be assumed by the Company and converted into a Company restricted stock award, with an adjustment to the number of shares subject to the award (determined by multiplying the pre-merger number of shares subject to the award by 0.2732 , and rounding up to the nearest whole share of the Company's common stock). The merger agreement provides that the aggregate cash consideration that will be paid for shares of American Chartered stock and for the net option shares is $100.0 million , with the remaining consideration consisting of shares of Company common stock. If American Chartered shareholders and holders of vested American Chartered stock options elect to receive more of one form of consideration than is available, the available amount will be allocated ratably among the American Chartered shareholders and vested option holders electing to receive that form of consideration, and those shareholders and vested option holders will receive the other form of consideration for the balance of their shares and net option shares, as applicable. The only exception to this is that holders of American Chartered Series D preferred stock who have made a cash election with respect to shares of American Chartered Series D preferred stock will receive the cash consideration for all of such shares (based on the number of shares of American Chartered common stock into which each share of American Chartered Series D preferred stock is then otherwise convertible), regardless of the elections of other shareholders and vested option holders. The transaction, which is subject to customary regulatory approvals and the approval of American Chartered stockholders, is expected to close around June 30, 2016.

Restrictions on Cash and Due Fr

Restrictions on Cash and Due From Banks	12 Months Ended
	Dec. 31, 2015
Cash and Cash Equivalents [Abstract]
Restrictions on Cash and Due From Banks	Restrictions on Cash and Due From Banks MB Financial Bank is required to maintain reserve balances in cash or on deposit with the Federal Reserve Bank, based on a percentage of deposits. The total of those required reserve balances was approximately $148.0 million and $127.2 million at December 31, 2015 and 2014 , respectively. The nature of the Company’s business requires that it maintain amounts with banks and federal funds sold which, at times, may exceed federally insured limits. Management monitors these correspondent relationships and the Company has not experienced any losses in such accounts.

Investment Securities

Investment Securities	12 Months Ended
	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities Amortized costs and fair values of investment securities were as follows (in thousands): Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value December 31, 2015 Available for Sale U.S. Government sponsored agencies and enterprises $ 63,805 $ 806 $ — $ 64,611 States and political subdivisions 373,285 23,083 (1 ) 396,367 Residential mortgage-backed securities 759,816 7,363 (3,630 ) 763,549 Commercial mortgage-backed securities 128,509 1,839 (241 ) 130,107 Corporate bonds 222,784 815 (3,971 ) 219,628 Equity securities 10,757 4 — 10,761 1,558,956 33,910 (7,843 ) 1,585,023 Held to Maturity States and political subdivisions 1,016,519 36,874 (638 ) 1,052,755 Residential mortgage-backed securities 214,291 7,721 — 222,012 1,230,810 44,595 (638 ) 1,274,767 Total $ 2,789,766 $ 78,505 $ (8,481 ) $ 2,859,790 December 31, 2014 Available for Sale U.S. Government sponsored agencies and enterprises $ 64,612 $ 1,281 $ (20 ) $ 65,873 States and political subdivisions 390,076 20,846 (68 ) 410,854 Residential mortgage-backed securities 713,413 8,977 (1,827 ) 720,563 Commercial mortgage-backed securities 186,110 1,772 (220 ) 187,662 Corporate bonds 259,526 2,428 (2,751 ) 259,203 Equity securities 10,531 66 — 10,597 1,624,268 35,370 (4,886 ) 1,654,752 Held to Maturity States and political subdivisions 752,558 30,089 (382 ) 782,265 Residential mortgage-backed securities 240,822 11,974 — 252,796 993,380 42,063 (382 ) 1,035,061 Total $ 2,617,648 $ 77,433 $ (5,268 ) $ 2,689,813 The Company has no direct exposure to the State of Illinois, but approximately 21% of the state and political subdivisions portfolio consists of securities issued by municipalities located in Illinois as of December 31, 2015 . Approximately 95% of such securities were general obligation issues as of December 31, 2015 . During the third quarter of 2014, the Company repositioned its balance sheet subsequent to the Taylor Capital merger and sold certain longer-term and lower-coupon investment securities with an approximate carrying amount of $451.6 million . These investment security sales shortened the overall duration of the investment securities portfolio to pre-merger levels. Also as a part of the balance sheet repositioning, securities of states and political subdivisions with an approximate fair value of $291.2 million and amortized cost of $273.5 million were transferred from held to maturity to available for sale during the third quarter of 2014. As a result of the repositioning, the Company recognized a net loss of $3.2 million in the third quarter of 2014. Unrealized losses on investment securities and the fair value of the related securities at December 31, 2015 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 States and political subdivisions $ 219 $ (1 ) $ — $ — $ 219 $ (1 ) Residential mortgage-backed securities 357,877 (2,835 ) 43,566 (795 ) 401,443 (3,630 ) Commercial mortgage-backed securities 2,324 (5 ) 11,809 (236 ) 14,133 (241 ) Corporate bonds 73,774 (1,164 ) 18,286 (2,807 ) 92,060 (3,971 ) 434,194 (4,005 ) 73,661 (3,838 ) 507,855 (7,843 ) Held to Maturity States and political subdivisions 66,152 (519 ) 6,190 (119 ) 72,342 (638 ) Totals $ 500,346 $ (4,524 ) $ 79,851 $ (3,957 ) $ 580,197 $ (8,481 ) Unrealized losses on investment securities and the fair value of the related securities at December 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 $ 9,644 $ (20 ) $ — $ — $ 9,644 $ (20 ) States and political subdivisions 7,784 (21 ) 3,558 (47 ) 11,342 (68 ) Residential mortgage-backed securities 235,818 (1,336 ) 29,373 (491 ) 265,191 (1,827 ) Commercial mortgage-backed securities 89,509 (220 ) — — 89,509 (220 ) Corporate bonds 62,693 (1,159 ) 9,675 (1,592 ) 72,368 (2,751 ) 405,448 (2,756 ) 42,606 (2,130 ) 448,054 (4,886 ) Held to Maturity States and political subdivisions 28,786 (130 ) 14,238 (252 ) 43,024 (382 ) Totals $ 434,234 $ (2,886 ) $ 56,844 $ (2,382 ) $ 491,078 $ (5,268 ) The total number of security positions in the investment portfolio in an unrealized loss position at December 31, 2015 was 193 compared to 168 at December 31, 2014 . 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 December 31, 2015 , 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 December 31, 2015 , 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 securities portfolio would decline substantially if interest rates increase materially. Net losses recognized on investment securities available for sale were as follows (in thousands): For the Years Ended December 31, 2015 2014 2013 Realized gains $ 1,470 $ 2,045 $ 15 Realized losses (1,646 ) (4,478 ) (2 ) Impairment charges — (92 ) (14 ) Net losses $ (176 ) $ (2,525 ) $ (1 ) The amortized cost and fair value of investment securities as of December 31, 2015 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 $ 44,600 $ 45,173 Due after one year through five years 236,143 233,095 Due after five years through ten years 40,979 42,317 Due after ten years 338,152 360,021 Equity securities 10,757 10,761 Residential and commercial mortgage-backed securities 888,325 893,656 1,558,956 1,585,023 Held to maturity: Due in one year or less 66,316 66,402 Due after one year through five years 174,620 175,547 Due after five years through ten years 116,900 121,739 Due after ten years 658,683 689,067 Residential mortgage-backed securities 214,291 222,012 1,230,810 1,274,767 Total $ 2,789,766 $ 2,859,790 Investment securities with carrying amounts of $1.4 billion and $1.5 billion at December 31, 2015 and 2014 , respectively, were pledged as collateral on public deposits and for other purposes as required or permitted by law, while only $878.2 million and $980.4 million were required to be pledged at December 31, 2015 and 2014 , respectively. Of those pledged, the Company had investment securities available for sale pledged as collateral for advances from the Federal Home Loan Bank of $108.8 million and $226.9 million at December 31, 2015 and 2014 , respectively.

Loans

Loans	12 Months Ended
	Dec. 31, 2015
Receivables [Abstract]
Loans	Loans Loans consist of the following at (in thousands): December 31, 2015 2014 Commercial $ 3,616,286 $ 3,245,206 Commercial collateralized by assignment of lease payments 1,779,072 1,692,258 Commercial real estate 2,695,676 2,544,867 Residential real estate 628,169 503,287 Construction real estate 252,060 247,068 Indirect vehicle 384,095 268,840 Home equity 216,573 251,909 Other consumer 80,661 78,137 Gross loans, excluding purchased credit-impaired loans 9,652,592 8,831,572 Purchased credit-impaired loans 141,406 251,645 Total loans $ 9,793,998 $ 9,083,217 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 and asset-based loans, 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. This policy is reviewed and approved by the Company's 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. Asset-based loans, also included in commercial loans, are made to businesses with the primary source of repayment derived from payments on the related assets securing the loan. Collateral for these loans may include accounts receivable, inventory and equipment, and is monitored regularly to ensure ongoing sufficiency of collateral coverage and quality. The primary risk for these loans is a significant decline in collateral values due to general market conditions. Loan terms that mitigate these risks include typical industry amortization schedules, percentage of collateral advances, maintenance of cash collateral accounts and regular asset monitoring. Because of the national scope of our asset-based lending, the risk of these loans is also diversified by geography. Commercial Loans Collateralized by Assignment of Lease Payments ("Lease Loans"). The Company makes lease loans to lessors where the underlying leases are with 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 policies 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 the financial wherewithal of the lessee using 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). Each loan type is underwritten based upon 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. Loans outstanding to executive officers and directors of the Company and MB Financial Bank, including companies in which they have management control or controlling beneficial ownership, at December 31, 2015 and 2014 , were approximately $75.0 million and $63.1 million , respectively. Total advances on loans outstanding to executive officers and directors, including companies in which they have management control or controlling beneficial ownership, were $28.6 million , and total repayments were $16.6 million during the year ended December 31, 2015 . In the opinion of management, these loans have similar terms to other customer loans and do not present more than normal risk of collection. 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 December 31, 2015 and 2014 , the Company had $3.2 billion and $2.0 billion , respectively, of loans pledged as collateral for 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 December 31, 2015 and 2014 (in thousands): Current 30-59 Days 60-89 Days Loans Past Due Total Total December 31, 2015 Commercial $ 3,586,372 $ 22,956 $ 97 $ 6,861 $ 29,914 $ 3,616,286 Commercial collateralized by assignment of lease payments 1,758,839 3,399 5,902 10,932 20,233 1,779,072 Commercial real estate: Healthcare 476,939 — — — — 476,939 Industrial 400,182 — — 757 757 400,939 Multifamily 399,333 622 88 934 1,644 400,977 Retail 410,958 6,189 7,411 180 13,780 424,738 Office 223,935 58 — 5,189 5,247 229,182 Other 760,530 622 82 1,667 2,371 762,901 Residential real estate 612,573 5,193 1,729 8,674 15,596 628,169 Construction real estate 252,060 — — — — 252,060 Indirect vehicle 380,899 2,085 698 413 3,196 384,095 Home equity 207,818 1,774 1,398 5,583 8,755 216,573 Other consumer 80,225 254 84 98 436 80,661 Gross loans, excluding purchased credit-impaired loans 9,550,663 43,152 17,489 41,288 101,929 9,652,592 Purchased credit-impaired loans 81,250 3,311 4,439 52,406 60,156 141,406 Total loans $ 9,631,913 $ 46,463 $ 21,928 $ 93,694 $ 162,085 $ 9,793,998 Non-performing loan aging $ 44,290 $ 9,827 $ 9,367 $ 41,177 $ 60,371 $ 104,661 December 31, 2014 Commercial $ 3,231,571 $ 8,222 $ — $ 5,413 $ 13,635 $ 3,245,206 Commercial collateralized by assignment of lease payments 1,679,991 2,025 6,095 4,147 12,267 1,692,258 Commercial real estate: Healthcare 342,984 — — — — 342,984 Industrial 333,907 944 — 3,182 4,126 338,033 Multifamily 417,504 1,377 — 1,517 2,894 420,398 Retail 432,718 2,481 652 2,325 5,458 438,176 Office 244,166 — — 2,127 2,127 246,293 Other 754,031 307 2,421 2,224 4,952 758,983 Residential real estate 485,492 8,038 2,319 7,438 17,795 503,287 Construction real estate 246,731 — — 337 337 247,068 Indirect vehicle 265,296 2,516 702 326 3,544 268,840 Home equity 242,756 2,717 1,039 5,397 9,153 251,909 Other consumer 78,106 16 12 3 31 78,137 Gross loans, excluding purchased credit-impaired loans 8,755,253 28,643 13,240 34,436 76,319 8,831,572 Purchased credit-impaired loans 158,215 4,432 585 88,413 93,430 251,645 Total loans $ 8,913,468 $ 33,075 $ 13,825 $ 122,849 $ 169,749 $ 9,083,217 Non-performing loan aging $ 46,149 $ 5,764 $ 1,099 $ 34,075 $ 40,938 $ 87,087 The following table presents the recorded investment in non-accrual loans and loans past due ninety days or more and still accruing by class of loans, excluding purchased credit-impaired loans, as of December 31, 2015 and 2014 (in thousands): 2015 2014 Loans past due Loans past due Non-accrual 90 days or more and still accruing Non-accrual 90 days or more and still accruing Commercial $ 24,689 $ 42 $ 14,088 $ — Commercial collateralized by assignment of lease payments 7,027 5,318 2,404 3,566 Commercial real estate: Healthcare — — — — Industrial 1,136 — 6,371 — Multifamily 3,415 — 5,333 — Office 4,496 693 3,644 464 Retail 17,594 — 2,986 — Other 1,544 195 13,541 324 Residential real estate 17,951 253 17,311 — Construction real estate — — 337 — Indirect vehicle 2,046 — 1,542 — Home equity 18,156 — 15,171 — Other consumer 11 95 5 — Total $ 98,065 $ 6,596 $ 82,733 $ 4,354 The reduction in interest income associated with loans on non-accrual status was approximately $3.7 million , $4.3 million , and $4.7 million for the years ended December 31, 2015 , 2014 , and 2013 , respectively. 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 watch list 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 and are not included in the table below. The following tables present the risk category of loans by class of loans based on the most recent analysis performed, excluding purchased credit-impaired loans, as of December 31, 2015 and 2014 (in thousands): Pass Special Substandard Doubtful Total December 31, 2015 Commercial $ 3,373,943 $ 115,548 $ 126,795 $ — $ 3,616,286 Commercial collateralized by assignment of lease payments 1,760,674 4,367 14,031 — 1,779,072 Commercial real estate: Healthcare 472,599 4,340 — — 476,939 Industrial 380,200 19,011 1,728 — 400,939 Multifamily 396,117 595 4,265 — 400,977 Retail 393,543 13,310 17,885 — 424,738 Office 216,584 3,797 8,801 — 229,182 Other 730,713 6,193 25,995 — 762,901 Construction real estate 252,060 — — — 252,060 Total $ 7,976,433 $ 167,161 $ 199,500 $ — $ 8,343,094 December 31, 2014 Commercial $ 3,036,069 $ 178,984 $ 30,153 $ — $ 3,245,206 Commercial collateralized by assignment of lease payments 1,680,736 6,853 4,669 — 1,692,258 Commercial real estate: Healthcare 338,622 4,362 — — 342,984 Industrial 314,225 8,817 14,991 — 338,033 Multifamily 412,824 920 6,654 — 420,398 Retail 423,842 2,740 11,594 — 438,176 Office 229,947 8,524 7,822 — 246,293 Other 708,447 22,013 28,523 — 758,983 Construction real estate 246,204 527 337 — 247,068 Total $ 7,390,916 $ 233,740 $ 104,743 $ — $ 7,729,399 Approximately $59.6 million and $49.1 million of the substandard and doubtful loans were non-performing as of December 31, 2015 and 2014 , 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, excluding purchased credit-impaired loans, as of December 31, 2015 and 2014 (in thousands): Performing Non-performing Total December 31, 2015 Residential real estate $ 609,965 $ 18,204 $ 628,169 Indirect vehicle 382,049 2,046 384,095 Home equity 198,417 18,156 216,573 Other consumer 80,555 106 80,661 Total $ 1,270,986 $ 38,512 $ 1,309,498 December 31, 2014 Residential real estate $ 485,976 $ 17,311 $ 503,287 Indirect vehicle 267,297 1,543 268,840 Home equity 236,739 15,170 251,909 Other consumer 78,132 5 78,137 Total $ 1,068,144 $ 34,029 $ 1,102,173 The recorded investment in residential mortgage loans secured by residential real estate properties for which foreclosure proceedings are in process totaled $2.4 million and $10.1 million at December 31, 2015 and 2014, respectively. The following tables present loans individually evaluated for impairment by class of loans, excluding purchased credit-impaired loans, as of December 31, 2015 and 2014 (in thousands): December 31, 2015 Unpaid Recorded Partial Allowance for Average Interest With no related allowance recorded: Commercial $ 11,253 $ 11,253 $ — $ — $ 6,628 $ — Commercial collateralized by assignment of lease payments 3,453 2,949 504 — 1,035 54 Commercial real estate: Healthcare — — — — — — Industrial 820 757 63 — 3,467 — Multifamily 575 575 — — 1,540 17 Retail 7,872 6,131 1,741 — 2,768 — Office 1,608 1,031 577 — 1,663 — Other — — — — 965 — Residential real estate 970 970 — — 717 — Construction real estate — — — — — — Indirect vehicle — — — — — — Home equity 927 927 — — 1,000 — Other consumer — — — — — — With an allowance recorded: Commercial 23,394 23,394 — 7,523 18,820 — Commercial collateralized by assignment of lease payments 3,297 3,297 — 1,790 4,013 104 Commercial real estate: Healthcare — — — — — — Industrial — — — — 228 — Multifamily 2,155 2,155 — 17 3,307 27 Retail 16,034 16,034 — 4,926 8,885 — Office 2,929 2,929 — 1,717 2,457 — Other 592 592 — 199 9,629 — Residential real estate 12,950 12,769 181 2,634 13,484 — Construction real estate — — — — 214 — Indirect vehicle 119 119 — — 287 — Home equity 28,696 28,583 113 3,131 27,747 — Other consumer — — — — — — Total $ 117,644 $ 114,465 $ 3,179 $ 21,937 $ 108,854 $ 202 December 31, 2014 Unpaid Recorded Partial Allowance for Average Interest With no related allowance recorded: Commercial $ 9,752 $ 8,992 $ 760 $ — $ 10,324 $ — Commercial collateralized by assignment of lease payments 2,316 2,316 — — 2,569 121 Commercial real estate: Healthcare — — — — — — Industrial 9,115 5,858 3,257 — 7,870 — Multifamily 1,733 1,733 — — 1,928 52 Retail 2,025 813 1,212 — 3,465 — Office — — — — 1,127 — Other 1,479 1,465 14 — 5,249 — Residential real estate 1,941 1,941 — — 2,740 — Construction real estate — — — — 34 — Indirect vehicle — — — — — — Home equity 577 577 — — 762 — Other consumer — — — — — — With an allowance recorded: Commercial 7,987 7,987 — 2,395 14,227 — Commercial collateralized by assignment of lease payments 715 715 — 105 1,515 91 Commercial real estate: Healthcare — — — — — — Industrial 517 513 4 130 4,982 — Multifamily 5,680 4,709 971 996 6,354 131 Retail 9,264 7,897 1,367 720 8,547 — Office 4,528 2,986 1,542 545 2,833 — Other 12,612 12,527 85 136 11,022 12 Residential real estate 14,234 14,234 — 3,126 14,632 — Construction real estate 2,707 337 2,370 162 455 — Indirect vehicle 227 227 — 14 358 — Home equity 25,927 25,705 222 2,153 25,672 — Other consumer — — — — — — Total $ 113,336 $ 101,532 $ 11,804 $ 10,482 $ 126,665 $ 407 Average impaired loans for the years ended December 31, 2015 , 2014 and 2013 were $108.9 million , $126.7 million and $136.5 million , respectively. Interest income recognized on impaired loans was $202 thousand , $407 thousand and $1.9 million for the years ended December 31, 2015 , 2014 and 2013 , respectively. Impaired loans included accruing restructured loans of $27.0 million and $15.6 million that have been modified and are performing in accordance with those modified terms as of December 31, 2015 and 2014 , respectively. In addition, impaired loans included $23.6 million and $25.8 million of non-performing, restructured loans as of December 31, 2015 and 2014 , 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, deferral of past due interest or principal, implementing an A/B note structure, redeeming past due taxes, reduction of interest rates, extending maturities and modification of 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”) and a restructuring program similar to the Home Affordable Modification Program (“HAMP”) for first mortgage borrowers as well as the Second Lien Modification Program (“2MP”) and similar programs for home equity borrowers in keeping with the restructuring techniques discussed above. Occasionally, 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 non-performing) through the calendar year of the restructuring that the historical payment performance has been established. As of December 31, 2015 and 2014 , there was one A/B structure with a recorded investment of $985 thousand and $1.0 million , respectively, which is included above as an accruing restructured loans. 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 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 would not be able to meet the modified terms of the loan, the loan would 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 and lease loss process. See Note 1 for additional information. 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 year ended December 31, 2015 (dollars in thousands): December 31, 2015 Number of Pre-Modification Recorded Post-Modification Recorded Charge-offs and Performing: Commercial 6 $ 11,074 $ 11,074 $ 2,810 Home equity 17 4,809 4,809 — Total 23 $ 15,883 $ 15,883 $ 2,810 Non-Performing: Commercial real estate: Industrial 1 414 414 9 Multifamily 1 334 334 — Office 1 815 815 191 Residential real estate 1 140 140 17 Indirect vehicle 16 88 88 32 Home equity 17 2,959 2,959 306 Total 37 $ 4,750 $ 4,750 $ 555 The following table presents loans that have been restructured during the year ended December 31, 2014 (dollars in thousands): December 31, 2014 Number of Pre-Modification Recorded Post-Modification Recorded Charge-offs and Performing: Residential real estate 3 $ 588 $ 588 $ — Indirect vehicle 2 26 26 — Home equity 9 2,251 2,251 — Total 14 $ 2,865 $ 2,865 $ — Non-Performing: Commercial 1 $ 263 $ 263 $ 85 Commercial real estate: Multifamily 1 158 158 40 Residential real estate 6 1,850 1,850 246 Indirect vehicle 53 320 320 88 Home equity 27 3,813 3,813 335 Total 88 $ 6,404 $ 6,404 $ 794 Of the troubled debt restructurings entered into during the past twelve months, $225 thousand subsequently defaulted during the year ended December 31, 2015 . 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 year ended December 31, 2015 (dollars in thousands): Performing Non-performing Beginning balance $ 15,603 $ 25,771 Additions 15,883 4,750 Charge-offs — (359 ) Principal payments, net (1,319 ) (1,059 ) Removals (6,800 ) (1,378 ) Transfer to other real estate owned — (482 ) Transfers in 4,334 710 Transfers out (710 ) (4,334 ) Ending balance $ 26,991 $ 23,619 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 and the post-modification recorded investment during the year ended December 31, 2015 (dollars in thousands): December 31, 2015 Extended Maturity, Delay in Amortization Extended Payments or and Reduction Maturity and/or Extended Reduction of of Interest Rate Amortization Maturity Interest Rate Total Commercial $ — $ — $ — $ 11,074 $ 11,074 Commercial real estate: Industrial — — 414 — 414 Multifamily — 334 — — 334 Office — — 815 — 815 Residential real estate 140 — — — 140 Indirect vehicle — — — 88 88 Home equity 4,111 827 — 2,830 7,768 Total $ 4,251 $ 1,161 $ 1,229 $ 13,992 $ 20,633 Activity in the allowance for loan and lease losses was as follows (in thousands): Year Ended December 31, 2015 2014 2013 Balance at beginning of year $ 114,057 $ 113,462 $ 128,279 Allowance for unfunded credit commitments acquired through business combination — 1,261 — Utilization of allowance for unfunded credit commitments — (637 ) — Provision for credit losses 21,386 12,052 (5,804 ) Charge-offs: Commercial 2,993 1,339 3,706 Commercial collateralized by assignment of lease payments 2,765 925 — Commercial real estate 3,563 11,438 7,517 Residential real estate 1,450 1,718 2,796 Construction real estate 34 79 980 Indirect vehicle 2,980 3,735 2,911 Home equity 1,485 3,383 3,692 Other consumer 1,941 2,128 2,073 Total charge-offs 17,211 24,745 23,675 Recoveries: Commercial 1,749 3,757 3,156 Commercial collateralized by assignment of lease payments 1,112 939 1,131 Commercial real estate 6,723 4,020 6,025 Residential real estate 515 1,190 479 Construction real estate 272 252 1,616 Indirect vehicle 1,853 1,736 1,411 Home equity 579 482 594 Other consumer 473 288 250 Total recoveries 13,276 12,664 14,662 Net charge-offs (recoveries) 3,935 12,081 9,013 Allowance for credit losses 131,508 114,057 113,462 Allowance for unfunded credit commitments (3,368 ) (4,031 ) (1,716 ) Balance at December 31, $ 128,140 $ 110,026 $ 111,746 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 December 31, 2015 and 2014 (in thousands): Commercial Commercial collateralized by assignment of lease payments Commercial real estate Residential real estate Construction real estate Indirect vehicle Home equity Other Consumer Unfunded Commitments Total December 31, 2015 Allowance for credit losses: Beginning balance $ 29,571 $ 9,962 $ 41,826 $ 6,646 $ 8,918 $ 1,687 $ 9,456 $ 1,960 $ 4,031 $ 114,057 Charge-offs 2,993 2,765 3,563 1,450 34 2,980 1,485 1,941 — 17,211 Recoveries 1,749 1,112 6,723 515 272 1,853 579 473 — 13,276 Provision 10,989 2,125 489 23 5,957 1,858 (1,176 ) 1,784 (663 ) 21,386 Ending balance $ 39,316 $ 10,434 $ 45,475 $ 5,734 $ 15,113 $ 2,418 $ 7,374 $ 2,276 $ 3,368 $ 131,508 Ending allowance balance attributable to loans: Individually evaluated for impairment $ 7,523 $ 1,790 $ 6,859 $ 2,634 $ — $ — $ 3,131 $ — $ 1,392 $ 23,329 Collectively evaluated for impairment 31,228 8,644 37,198 3,100 15,019 2,418 4,243 2,276 1,976 106,102 Acquired and accounted for under ASC 310-30 (1) 565 — 1,418 — 94 — — — — 2,077 Total ending allowance balance $ 39,316 $ 10,434 $ 45,475 $ 5,734 $ 15,113 $ 2,418 $ 7,374 $ 2,276 $ 3,368 $ 131,508 Loans: Individually evaluated for impairment $ 34,647 $ 6,246 $ 30,204 $ 13,739 $ — $ 119 $ 29,510 $ — $ — $ 114,465 Collectively evaluated for impairment 3,581,639 1,772,826 2,665,472 614,430 252,060 383,976 187,063 80,661 — 9,538,127 Acquired and accounted for under ASC 310-30 (1) 24,284 — 36,362 53,156 10,891 — 14,004 2,709 — 141,406 Total ending loans balance $ 3,640,570 $ 1,779,072 $ 2,732,038 $ 681,325 $ 262,951 $ 384,095 $ 230,577 $ 83,370 $ — $ 9,793,998 December 31, 2014 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 Allowance for unfunded credit commitments acquired through business combination — — — — — — — — 1,261 1,261 Utilization of allowance for unfunded credit commitments — — — — — — — — (637 ) (637 ) Charge-offs 1,339 925 11,438 1,718 79 3,735 3,383 2,128 — 24,745 Recoveries 3,757 939 4,020 1,190 252 1,736 482 288 — 12,664 Provision 3,692 789 (2,384 ) (1,698 ) 1,889 2,024 3,879 2,170 1,691 12,052 Ending balance $ 29,571 $ 9,962 $ 41,826 $ 6,646 $ 8,918 $ 1,687 $ 9,456 $ 1,960 $ 4,031 $ 114,057 Ending allowance balance attributable to loans: Individually evaluated for impairment $ 2,395 $ 105 $ 2,527 $ 3,126 $ 162 $ 14 $ 2,153 $ — $ 1,348 $ 11,830 Collectively evaluated for impairment 26,684 9,857 38,517 3,520 8,747 1,673 7,303 1,960 2,683 100,944 Acquired and accounted for under ASC 310-30 (1) 492 — 782 — 9 — — — — 1,283 Total ending allowance balance $ 29,571 $ 9,962 $ 41,826 $ 6,646 $ 8,918 $ 1,687 $ 9,456 $ 1,960 $ 4,031 $ 114,057 Loans: Individually evaluated for impairment $ 16,979 $ 3,031 $ 38,501 $ 16,175 $ 337 $ 227 $ 26,282 $ — $ — $ 101,532 Collectively evaluated for impairment 3,228,227 1,689,227 2,506,366 487,112 246,731 268,613 225,627 78,137 — 8,730,040 Acquired and accounted for under ASC 310-30 (1) 103,582 — 80,378 14,138 31,068 — 138 22,341 — 251,645 Total ending loans balance $ 3,348,788 $ 1,692,258 $ 2,625,245 $ 517,425 $ 278,136 $ 268,840 $ 252,047 $ 100,478 $ — $ 9,083,217 (1) Loans acquired in business combinations 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 and lease 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 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. For pass rated loans (non-purchased credit-impaired loans), the difference between the estimated fair value of the loans (computed on a loan by loan basis) and the principal outstanding is accreted over the remaining life of the loans. The Company anticipates recording a provision for the acquired portfolio in future quarters related to renewing Taylor Capital loans which will offset a substantial portion of the accretion from the pass rated loans. In accordance with ASC 310-30, for both purchased non-impaired loans and purchased credit-impaired loans ("PCI 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 year ended December 31, 2015 , there was a negative provision for credit losses of $2.0 million and net recoveries of $2.8 million , respectively, in relation to 17 pools of purchased loans with a total carrying amount of $37.2 million as of December 31, 2015 . During the year ended December 31, 2014 , there was a provision for credit losses of $1.3 million and net recoveries of $323 thousand in relation to 16 pools of purchased loans with a total carrying amount of $71.7 million as of December 31, 2014 . There was $2.1 million in allowance for loan and lease losses related to these purchased loans at December 31, 2015 and $1.3 million at December 31, 2014 . The provision for credit losses and accompanying charge-offs are included in the table above. Changes in the accretable yield for loans acquired and accounted for under ASC 310-30 were as follows for the years ended December 31, 2015 and 2014 (in thousands): Year Ended December 31, 2015 2014 Balance at beginning of period $ 7,434 $ 2,337 Purchases — 5,626 Accretion (9,637 ) (2,098 ) Other (1) 14,799 1,569 Balance at end of period $ 12,596 $ 7,434 (1) Primarily includes discount transfers from non-accretable discount to accretable discount due to better than expected performance of loan pools acquired and accounted for under ASC 310-30. In the Company's 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, the Company 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 and lease losses is established for the impairment of the loans. A provision for credit 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

Lease Investments

Lease Investments	12 Months Ended
	Dec. 31, 2015
Leases [Abstract]
Lease Investments	Lease Investments The lease portfolio is comprised of various types of equipment, generally technology related, including computer systems and satellite equipment, material handling and general manufacturing equipment. Lease investments by categories follow (in thousands): December 31, 2015 2014 Direct finance leases: Minimum lease payments $ 392,901 $ 340,602 Estimated unguaranteed residual values 74,411 70,469 Less: unearned income (34,675 ) (31,229 ) Direct finance leases (1) $ 432,637 $ 379,842 Leveraged leases: Minimum lease payments $ 3,286 $ 10,689 Estimated unguaranteed residual values 523 1,586 Less: unearned income (126 ) (540 ) Less: related non-recourse debt (3,199 ) (10,330 ) Leveraged leases (1) $ 484 $ 1,405 Operating leases: Equipment, at cost $ 318,843 $ 257,495 Less accumulated depreciation (107,156 ) (94,662 ) Lease investments, net $ 211,687 $ 162,833 (1) Direct finance and leveraged leases are included as commercial loans collateralized by assignment of lease payments for financial statement purposes. Leases that transfer substantially all of the benefits and risk related to the equipment ownership are classified as direct finance leases. If these direct finance leases have non-recourse debt associated with them and meet the additional requirements for a leveraged lease, they are further classified as leveraged leases, and the associated debt is netted with the outstanding balance in the consolidated financial statements. Interest income on direct finance and leveraged leases is recognized using methods which approximate a level yield over the term of the lease. Operating leases are investments in equipment leased to other companies, where the residual component makes up more than 10% of the investment. The Company funds most of the lease equipment purchases internally, but has some loans at other banks which totaled $55.0 million at December 31, 2015 and $38.5 million at December 31, 2014 . The minimum lease payments receivable for the various categories of leases are due as follows (in thousands) for the years ending December 31, Direct Finance Leveraged Operating Year Leases Leases Leases Total 2016 $ 146,150 $ 2,465 $ 46,503 $ 195,118 2017 110,435 642 35,685 146,762 2018 70,320 179 24,194 94,693 2019 38,575 — 15,129 53,704 2020 11,905 — 9,491 21,396 Thereafter 15,516 — 6,983 22,499 $ 392,901 $ 3,286 $ 137,985 $ 534,172 At December 31, 2015 , the following reflects the residual values for leases by category in the year the initial lease term ends (in thousands): Residual Values Direct End of initial lease term Finance Leveraged Operating December 31, Leases Leases Leases Total 2016 $ 7,178 $ 400 $ 13,503 $ 21,081 2017 20,158 104 9,472 29,734 2018 16,435 19 11,338 27,792 2019 14,196 — 7,750 21,946 2020 10,499 — 10,763 21,262 Thereafter 5,945 — 17,400 23,345 $ 74,411 $ 523 $ 70,226 $ 145,160 The lease residual value represents the present value of the estimated fair value of the leased equipment at the termination of the lease. Lease residual values are generally reviewed quarterly, and any write-downs or charge-offs deemed necessary are recorded in the period in which they become known. To mitigate this risk of loss, we usually limit individual leased equipment residuals to approximately $1.0 million per transaction and seek to diversify both the type of equipment leased and the industries in which the lessees participate. Often times, there are several individual lease schedules under one master lease. There were 4,369 leases at December 31, 2015 compared to 3,793 at December 31, 2014 . The average residual value per lease schedule was approximately $33 thousand at December 31, 2015 and $34 thousand at December 31, 2014 . The average residual value per master lease schedule was approximately $132 thousand at December 31, 2015 and $155 thousand at December 31, 2014 . Income from lease financing, net was composed of (in thousands): Years Ended December 31, 2015 2014 2013 Rental income $ 69,363 $ 64,017 $ 62,629 Equipment maintenance contracts revenue, net of cost of sales 23,027 16,441 11,071 Vendor promotional income 8,527 8,382 7,587 Other lease related revenue 5,038 2,121 1,796 Gain on sale of lease payments and leased equipment, net of residual write downs 8,042 12,899 12,002 Income on lease investments, gross 113,997 103,860 95,085 Less: depreciation on operating leases (37,416 ) (39,550 ) (33,842 ) Lease financing, net $ 76,581 $ 64,310 $ 61,243 Extension rents received in excess of residual values are reflected in rental income. Equipment maintenance contracts revenue represents the gross amount of revenue paid for maintenance contracts and other services brokered to customers. The maintenance contracts are serviced by third parties, with the Company maintaining no obligation under the contracts. The cost of sales is the amount paid by the Company to the third party maintenance provider. From time to time, the Company sells minimum lease payments to third parties. Gains on leased equipment periodically result when a lessee renews a lease or purchases the equipment at the end of a lease or the equipment is sold to a third party at a profit. Individual lease transactions can, however, result in a loss. This generally happens when, at the end of a lease, the lessee does not renew the lease or purchase the equipment.

Premises and Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Premises and Equipment	Premises and Equipment Premises and equipment consisted of (in thousands): December 31, 2015 2014 Land and land improvements $ 67,089 $ 67,630 Buildings 100,041 100,505 Furniture and equipment 139,648 124,490 Buildings and leasehold improvements 61,383 59,733 368,161 352,358 Accumulated depreciation (132,148 ) (113,981 ) Premises and equipment, net $ 236,013 $ 238,377 Depreciation on premises and equipment totaled $22.1 million , $20.4 million , and $18.1 million for the years ended December 31, 2015 , 2014 , and 2013 , respectively.

Goodwill and Intangibles

Goodwill and Intangibles	12 Months Ended
	Dec. 31, 2015
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 had three reporting units: banking, leasing and mortgage banking. Based on the Company's 2015 goodwill impairment testing, the fair values of the three reporting units were in excess of their carrying value. No impairment losses were recognized during the years ended December 31, 2015 , 2014 , or 2013 . The carrying amount of goodwill was $725.1 million at December 31, 2015 and $711.5 million December 31, 2014 . The increase of $13.5 million in goodwill was due to the acquisition of MSA. The following table presents the changes in the carrying amount of goodwill as of December 31, 2015 and 2014 (in thousands): December 31, 2015 2014 Banking Leasing Mortgage banking Total Banking Leasing Mortgage banking Total Balance at beginning of period $ 670,881 $ 40,640 $ — $ 711,521 $ 670,881 $ 40,640 $ — $ 711,521 Goodwill from business combinations 13,549 — — 13,549 — — — — Balance at end of period $ 684,430 $ 40,640 $ — $ 725,070 $ 670,881 $ 40,640 $ — $ 711,521 The Company has other intangible assets consisting of core deposit and client relationship intangibles that had a remaining weighted average amortization period of approximately six years as of December 31, 2015 . The Company recorded a $12.9 million core deposit intangible in 2015 due to the acquisition of MSA in December 2015 and of the Illinois court-appointed guardianship and special needs trust business of JPMorgan Chase in August 2015. 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 December 31, 2015 and 2014 (in thousands): December 31, 2015 2014 Balance at beginning of period $ 38,006 $ 23,428 Amortization expense (6,115 ) (5,501 ) Other intangibles from business combinations 12,921 20,079 Balance at end of period $ 44,812 $ 38,006 Gross carrying amount $ 93,292 $ 80,371 Accumulated amortization (48,480 ) (42,365 ) Net book value $ 44,812 $ 38,006 The following presents the estimated amortization expense of other intangible assets (in thousands): Years ending December 31, Amount 2016 $ 6,407 2017 5,738 2018 5,242 2019 3,685 2020 3,232 Thereafter 20,508 $ 44,812

Deposits

Deposits	12 Months Ended
	Dec. 31, 2015
Banking and Thrift [Abstract]
Deposits	Deposits The composition of deposits was as follows (in thousands): December 31, 2015 2014 Demand deposit accounts, noninterest bearing $ 4,627,184 $ 4,118,256 NOW and money market accounts 4,144,633 3,913,765 Savings accounts 974,555 940,345 Certificates of deposit, $250,000 or more 877,352 838,928 Other certificates of deposit 881,491 1,179,648 Total $ 11,505,215 $ 10,990,942 Certificates of deposit of $250,000 or more included $500.2 million and $485.3 million of brokered deposits at December 31, 2015 and 2014 , respectively. Brokered deposits typically consist of smaller individual time certificates that have the same liquidity characteristics and yields consistent with time certificates of $250,000 or more. At December 31, 2015 , the scheduled maturities of certificates of deposit were as follows (in thousands): 2016 $ 1,130,389 2017 282,486 2018 199,572 2019 48,110 2020 82,941 Thereafter 15,345 $ 1,758,843

Short-Term Borrowings

Short-Term Borrowings	12 Months Ended
	Dec. 31, 2015
Debt Disclosure [Abstract]
Short-Term Borrowings	Short-Term Borrowings Short-term borrowings were as follows as of December 31, 2015 and 2014 (dollars in thousands): December 31, 2015 2014 Weighted Average Weighted Average Cost Amount Cost Amount Customer repurchase agreements 0.20 % $ 201,207 0.21 % $ 219,824 Federal Home Loan Bank advances 0.17 775,000 0.13 700,000 Federal funds purchased 0.09 4,530 0.14 11,591 Line of credit 2.18 25,000 — — 0.23 % $ 1,005,737 0.15 % $ 931,415 Customer repurchase agreements 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 pledges mortgage-backed securities as collateral for the repurchase agreements and may be required to provide additional collateral based on the fair value of those securities. The Company had fixed rate Federal Home Loan Bank ("FHLB") advances with a maturity date less than one year of $775.0 million at December 31, 2015 and $700.0 million at December 31, 2014 . At December 31, 2015 , the interest rate on the advances outstanding on that date ranging from 0.16% to 0.19% with maturities from January 4, 2016 to December 12, 2016 . The Company has investment securities available for sale and loans pledged as collateral on these FHLB advances. See Note 4. Investment Securities and Note 5. Loans of the notes to the consolidated financial statements. On December 18, 2015, 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 + 1.75% . As of December 31, 2015 , $25.0 million was outstanding and the line of credit is scheduled to mature on December 17, 2016.

Long-term Borrowings

Long-term Borrowings	12 Months Ended
	Dec. 31, 2015
Debt Disclosure [Abstract]
Long-term Borrowings	Long-term Borrowings The Company had FHLB advances with original contractual maturities greater than one year of $305.2 million and $4.2 million at December 31, 2015 and 2014 , respectively. As of December 31, 2015 , the advances had fixed terms with effective interest rates, net of discounts, ranging from 0.38% to 5.87% and maturities ranging from March 2017 to April 2035 . The Company has investment securities available for sale and loans pledged as collateral on these FHLB advances. See Note 4. Investment Securities and Note 5. Loans of the notes to the consolidated financial statements. The Company had notes payable to banks totaling $55.0 million and $38.5 million at December 31, 2015 and 2014 , respectively, which as of December 31, 2015 , were accruing interest at rates ranging from 2.25% to 12.00% , with a weighted average rate of 4.30% . Lease investments include equipment with an amortized cost of $65.8 million and $48.8 million at December 31, 2015 and 2014 , respectively, that is pledged as collateral on these notes. The Company had a $40.0 million 10 -year structured repurchase agreement as of December 31, 2015 and 2014 , which bears interest at a fixed rate borrowing of 4.75% and expires in March 2016. The Company pledges mortgage-backed securities as collateral for the repurchase agreement and may be required to provide additional collateral based on the fair value of those securities. The principal payments on long-term borrowings are due as follows (in thousands): Amount Years ending December 31, 2016 $ 65,374 2017 317,066 2018 8,539 2019 3,549 2020 1,373 Thereafter 4,373 $ 400,274

Junior Subordinated Notes Issue

Junior Subordinated Notes Issued to Capital Trusts	12 Months Ended
	Dec. 31, 2015
Debt Disclosure [Abstract]
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 December 31, 2015 (in thousands): Coal City Capital Trust I MB Financial Capital Trust II MB Financial Capital Trust III MB Financial 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 Capital Trust V MB Financial Capital Trust VI FOBB Statutory Trust III (2) TAYC Capital Trust II (3) Junior Subordinated Notes: Principal balance $ 30,928 $ 23,196 $ 5,155 $ 41,238 Annual interest rate 3-mo LIBOR + 1.30% 3-mo LIBOR + 1.30% 3-mo LIBOR + 2.80% 3-mo LIBOR + 2.68% Stated maturity date December 15, 2037 October 30, 2037 January 23, 2034 June 17, 2034 Call date December 15, 2012 October 30, 2012 January 23, 2009 June 17, 2009 Trust Preferred Securities: Face Value $ 30,000 $ 22,500 $ 5,000 $ 40,000 Annual distribution rate 3-mo LIBOR + 1.30% 3-mo LIBOR + 1.30% 3-mo LIBOR + 2.80% 3-mo LIBOR + 2.68% Issuance date September 2007 October 2007 December 2003 June 2004 Distribution dates (1) Quarterly 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 in 2006, and the junior subordinated notes issued by FOBB to FOBB Statutory Trust III were assumed by the Company upon completion of the acquisition. (3) TAYC Capital Trust II was established by Taylor Capital prior to the Company's acquisition of Taylor Capital in 2014, and the junior subordinated notes issued by Taylor Capital to TAYC Capital Trust II were assumed by the Company upon completion of the acquisition. Principal balance and face value amounts associated with TAYC Capital Trust II do not include acquisition accounting adjustments to such amounts, which in each case resulted in a discount. This discount was $7.1 million as of December 31, 2015 . 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. 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, constitute 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 common or preferred stock and generally may not repurchase its common or preferred stock. On September 22, 2014, the Company redeemed the junior subordinated notes held by Taylor Capital Trust I and concurrently redeemed all of the issued and outstanding 9.75% TAYC Capital Trust I Preferred Securities. The aggregate liquidation amount of the trust preferred securities was $45.4 million . TAYC Capital Trust I was established by Taylor Capital prior to the Company's acquisition of Taylor Capital, and the junior subordinated notes issued by Taylor Capital to TAYC Capital Trust I were assumed by the Company upon completion of the acquisition. As a result, a $1.9 million gain on early extinguishment of this debt was recognized in the third quarter of 2014.

Lease Commitments and Rental Ex

Lease Commitments and Rental Expense	12 Months Ended
	Dec. 31, 2015
Leases [Abstract]
Lease Commitments and Rental Expense	Lease Commitments and Rental Expense The Company leases office space for certain branch offices. At December 31, 2015 , the future minimum annual rental commitments for these noncancelable leases and subleases of such space were as follows (in thousands): Gross Sublease Net Years ending December 31, Rents Rents Rents 2016 $ 10,463 $ 577 $ 9,886 2017 9,365 504 8,861 2018 6,923 462 6,461 2019 5,909 397 5,512 2020 3,469 397 3,072 Thereafter 16,359 166 16,193 $ 52,488 $ 2,503 $ 49,985 Under the terms of these leases, the Company is required to pay its pro rata share of the cost of maintenance and real estate taxes. Certain leases also provide for increased rental payments based on increases in the Consumer Price Index. Net rental expense for the years ended December 31, 2015 , 2014 , and 2013 amounted to $8.9 million , $7.4 million , and $4.7 million , respectively.

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Employee Benefit Plans	Employee Benefit Plans The Company has a defined contribution 401(k) profit sharing plan that covers most full-time employees who have completed three months of service. Each participant under the plan may contribute up to 75% of his/her eligible compensation on a pretax basis. The Company’s contributions consist of a discretionary profit-sharing contribution and a matching contribution of the amounts contributed by the participants. The board of directors determines the Company’s contributions on an annual basis. During 2015 , each participant was eligible for a maximum total Company matching contribution of 3.5% of their eligible compensation. Additionally, the Company may make annual discretionary profit sharing contributions. The Company’s total contribution to the plan for the year ended December 31, 2015 was estimated to be $14.2 million and was $7.4 million and $7.0 million for the years ended December 31, 2014 and 2013 , respectively. The Company has deferred compensation plans that allow certain executives, senior officers, directors and other employees to defer payment of up 100% of their base salary and bonus in the case of employees and board fees in the case of directors. Company contributions to these plans, which include discretionary contributions and the annual contribution to the Chief Executive Officer's account described below, were estimated to be approximately $869 thousand for the year ended December 31, 2015 . These contributions were $512 thousand and $520 thousand for the years ended December 31, 2014 and 2013 , respectively. Pursuant to the employment agreement between the Company and its Chief Executive Officer, he is entitled to receive on each December 31st while he is employed by the Company (starting December 31, 2007) a fully vested employer contribution to his account under the Company's non-stock deferred compensation plan in amount equal to 20% of his base salary then in effect. The amounts deferred can be invested in MB Financial stock (under the Company’s stock deferred compensation plan) or publicly traded mutual funds (under the Company’s non-stock deferred compensation plan) at the discretion of the participant. The cost of the MB Financial common stock held by MB Financial’s deferred compensation plans is reported separately in a manner similar to treasury stock (that is, changes in fair value are not recognized) with a corresponding deferred compensation obligation reflected in additional paid-in capital. The amounts of the assets that are not invested in MB Financial common stock are recorded at their fair market value in other assets on the consolidated balance sheet. As of December 31, 2015 , the fair value of the assets held in other publicly traded funds totaled $16.8 million . A liability is established, in other liabilities, on the consolidated balance sheet, for the fair value of the obligation to the participants. Any increase or decrease in the fair market value of plan assets is recorded in other non-interest income on the consolidated statement of operations. Any increase or decrease in the fair value of the deferred compensation obligation to participants is recorded as additional compensation expense or a reduction of compensation expense on the consolidated statement of operations. The increase in fair market value of the assets and the obligation related to the deferred compensation plan was $6 thousand for the year ended December 31, 2015 .

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The deferred taxes consist of (in thousands): December 31, 2015 2014 Deferred tax asset: Allowance for credit losses $ 51,256 $ 43,853 Federal net operating loss carryforwards — 12,234 State net operating loss carryforwards 22,624 26,582 Other real estate owned 11,165 14,229 Stock options and restricted stock 7,317 5,904 Loans 36,386 47,668 Deferred compensation 8,550 10,620 Tax credit carryforwards 27,904 25,244 Bonus accrual 3,827 5,595 Other items 1,008 3,390 Total deferred tax asset 170,037 195,319 Valuation allowance — — Total deferred tax asset, net of valuation allowance 170,037 195,319 Deferred tax liability: Equipment leasing (132,159 ) (112,524 ) Premises and equipment (21,371 ) (18,817 ) Mortgage servicing rights (59,369 ) (64,486 ) Deferred income from FDIC-assisted transactions (43,102 ) (45,999 ) Investment securities (2,317 ) (1,802 ) FHLB stock dividends (3,207 ) (2,652 ) Core deposit intangible (7,448 ) (9,118 ) Other items (3,509 ) (2,794 ) Total deferred tax liability (272,482 ) (258,192 ) Net deferred tax liability (102,445 ) (62,873 ) Net unrealized holding gain on investment securities available for sale (10,137 ) (13,099 ) Net deferred tax liability $ (112,582 ) $ (75,972 ) The Company’s Illinois net operating loss carryforwards totaled $441.0 million at December 31, 2015 and begin to expire in 2021 through 2029. In January of 2011, the State of Illinois enacted legislation suspending the utilization of net operating loss carryforwards. For Illinois purposes, no carryover deduction was allowed for any taxable year ending after December 31, 2010 and prior to December 31, 2012, and no carryover deduction could exceed $100,000 for any taxable year ending on or after December 31, 2012 and prior to December 31, 2014. Further, the legislation extended the carryover period for Illinois net operating losses by the number of taxable years in which carryover deductions are disallowed or limited. The Company's tax credit carryforwards include federal alternative minimum tax credits of $23.4 million with an indefinite carryforward period and general business credits of $4.4 million with expiration dates occurring in 2028 through 2035. Management has determined that is more likely than not that the deferred tax assets, including the net operating loss carryforwards, as of December 31, 2015 , will be realized and that no valuation allowance is required. The Company also had other state net operating loss carryforwards totaling $8.5 million at December 31, 2015 , the majority of which do not begin to expire until after 2021. Income taxes attributable to continuing operations consist of (in thousands): Years Ended December 31, 2015 2014 2013 Current expense (benefit): Federal $ 30,283 $ 25,270 $ 12,234 State 3,355 11,971 5,576 Foreign — — — 33,638 37,241 17,810 Deferred expense (benefit): Federal 28,765 3,122 17,245 State 10,808 (3,170 ) 4,436 Foreign — — — 39,573 (48 ) 21,681 $ 73,211 $ 37,193 $ 39,491 The reconciliation between the statutory federal income tax rate of 35% and the effective tax rate on income from continuing operations follows (in thousands): Years Ended December 31, 2015 2014 2013 Federal income tax expense at expected statutory rate $ 81,256 $ 43,153 $ 48,281 Increase (decrease) due to: Tax exempt income, net (16,909 ) (14,848 ) (14,200 ) State tax expense net of federal impact 9,205 5,721 6,508 Non-deductible contingent consideration 158 3,738 — Non-includable increase in cash surrender value of life insurance (1,191 ) (1,120 ) (1,111 ) Non-deductible merger expense 360 988 591 Adjustment of tax contingency reserves (969 ) (31 ) (24 ) Other items, net 1,301 (408 ) (554 ) Income tax expense $ 73,211 $ 37,193 $ 39,491 ASC Topic 740, "Accounting for Uncertainty in Income Taxes" provides guidance on financial statement recognition and measurement of tax positions taken, or expected to be taken, in tax returns. A reconciliation of the change in unrecognized tax benefits from January 1, 2015 to December 31, 2015 is as follows (in thousands): Unrecognized Tax Benefit Without Interest Interest on unrecognized Tax Benefit Total Unrecognized Tax Benefit Including Interest Balance at January 1, 2015 $ 981 $ 7 $ 988 Increases for tax positions of prior years — 1 1 Decreases related to prior year tax positions (927 ) — (927 ) Decreases related to lapse of statute of limitations (37 ) (6 ) (43 ) Balance at December 31, 2015 $ 17 $ 2 $ 19 The whole amount of unrecognized tax benefits would affect the tax provision and the effective income tax rate if recognized in future periods. The Company elects to treat interest and penalties recognized for the underpayment of income taxes as income tax expense, to the extent not included in unrecognized tax benefits. The Company’s federal income tax returns are open and subject to examination for the 2012 tax return year and forward. The Company’s various state income tax returns are generally open for the 2011 tax return year and forward based on individual state statutes of limitation. The Company is currently under examination by multiple state taxing authorities.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2015
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 December 31, 2015 and 2014 , the following financial instruments were outstanding, the contractual amounts of which represent off-balance sheet credit risk (in thousands): Contractual Amount 2015 2014 Commitments to extend credit: Home equity lines $ 187,478 $ 221,102 Other commitments 3,049,152 2,643,220 Letters of credit: Standby 137,945 131,810 Commercial 1,108 2,401 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 December 31, 2015 , the maximum remaining term for any standby letters of credit matures on September 30, 2030 . 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 December 31, 2015 , 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 $4.8 million to $139.1 million from $134.2 million at December 31, 2014 . Of the $139.1 million in commitments outstanding at December 31, 2015 , approximately $116.7 million of the letters of credit have been issued or renewed since December 31, 2014 . 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 credit is secured or partially secured, the collateral can take various forms including bank accounts, investments, fixed assets, inventory, accounts receivable or real estate. 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 December 31, 2015 , the Company had approximately $6.2 million in capital expenditure commitments outstanding which relate to various projects to renovate the corporate office space and 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 December 31, 2015 , approximately 21% 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 December 31, 2015 . The distribution of commitments to extend credit approximates the distribution of loans outstanding. Standby letters of credit are granted primarily to commercial borrowers. Our asset-based loans are made to borrowers located throughout the United States. 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.

Regulatory Matters

Regulatory Matters	12 Months Ended
	Dec. 31, 2015
Banking and Thrift [Abstract]
Regulatory Matters	Regulatory Matters The Company’s primary source of cash is dividends from its bank subsidiary, MB Financial Bank. The bank subsidiary is subject to certain restrictions on the amount of dividends that it may declare without prior regulatory approval. In addition, the dividends declared cannot be in excess of the amount which would cause the bank subsidiary to fall below the minimum required for capital adequacy purposes. The Company and its bank subsidiary are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory — and additional discretionary — actions by regulators that, if undertaken, could have a direct material effect on the Company’s financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company’s and its bank subsidiary’s assets, liabilities, and certain off-balance-sheet items are calculated under regulatory accounting practices. The Company’s and its bank subsidiary’s capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings, and other factors. Prompt corrective action provisions are not applicable to bank holding companies. Quantitative measures established by regulation to ensure capital adequacy require the Company and its bank subsidiary to maintain minimum amounts and ratios (set forth in the table below) of total and Tier 1 capital (as defined in the regulations) to risk-weighted assets (as defined), and of Tier 1 capital (as defined) to average assets (as defined). Management believes the Company and its bank subsidiary met all capital adequacy requirements to which they were subject as of December 31, 2015 and 2014 . As of December 31, 2015 , the most recent regulatory notification categorized the bank subsidiary as “well capitalized” under the regulatory framework then in effect for prompt corrective action. To be categorized as “well capitalized” as of December 31, 2015 , the bank subsidiary must have maintained the total risk-based, Tier 1 risk-based, common equity Tier 1 and Tier 1 leverage ratios as set forth in the well-capitalized column in the table below. There are no conditions or events since that notification that management believes have changed the bank subsidiary’s categories. The required and actual amounts and ratios for the Company and its bank subsidiary are presented below as of the dates indicated (dollars in thousands): To Be Well Capitalized Under For Capital Prompt Corrective Actual Adequacy Purposes Action Provisions Amount Ratio Amount Ratio Amount Ratio As of December 31, 2015 Total capital (to risk-weighted assets): Consolidated $ 1,635,548 12.54 % $ 1,043,025 8.00 % N/A N/A MB Financial Bank 1,509,453 11.62 1,039,129 8.00 $ 1,298,911 10.00 % Tier 1 capital (to risk-weighted assets): Consolidated $ 1,504,040 11.54 % 782,269 6.00 % N/A N/A MB Financial Bank 1,377,945 10.61 779,347 6.00 1,039,129 8.00 % Common equity tier 1 capital (to risk-weighted assets): Consolidated $ 1,208,938 9.27 % 586,702 4.50 % N/A N/A MB Financial Bank 1,377,945 10.61 584,510 4.50 844,292 6.50 % Tier 1 capital (to average assets): Consolidated $ 1,504,040 10.40 % 578,398 4.00 % N/A N/A MB Financial Bank 1,377,945 9.54 577,999 4.00 722,499 5.00 % As of December 31, 2014 Total capital (to risk-weighted assets): Consolidated $ 1,544,759 13.62 % $ 907,369 8.00 % N/A N/A MB Financial Bank 1,473,928 13.03 904,917 8.00 $ 1,131,146 10.00 % Tier 1 capital (to risk-weighted assets): Consolidated 1,430,702 12.61 % 453,684 4.00 % N/A N/A MB Financial Bank 1,359,871 12.02 452,459 4.00 678,688 6.00 % Tier 1 capital (to average assets): Consolidated 1,430,702 10.47 % 546,766 4.00 % N/A N/A MB Financial Bank 1,359,871 9.96 545,943 4.00 682,429 5.00 % N/A — not applicable

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2015
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. Loans. The Company has elected to record certain mortgage loans at fair value. The fair value of these loans is determined using quoted secondary market prices and classified as Level 2. Mortgage Servicing Rights. The Company has elected to record its mortgage servicing rights at fair value. Mortgage servicing rights do not trade in an active market with readily observable prices. Accordingly, the Company determines the fair value of mortgage servicing rights by estimating the fair value of the future cash flows associated with the mortgage loans being serviced. Key economic assumptions used in measuring the fair value of mortgage servicing rights include, but are not limited to, prepayment speeds, discount rates, delinquencies and cost to service. The assumptions used in the model are validated on a regular basis. The fair value is validated on a quarterly basis with an independent third party. Any discrepancies between the internal model and the third party validation are investigated and resolved by an internal committee. Due to the nature of the valuation inputs, mortgage servicing rights are classified in Level 3 of the fair value hierarchy. 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. The Company also obtains dealer quotations for these derivatives for comparative purposes to assess the reasonableness of the model valuations. In addition, the Company uses forward commitments to buy to-be-announced mortgage securities for which we do not intend to take delivery of the security and will enter into an offsetting position before physical delivery to lessen the price volatility of the mortgage servicing rights asset. Dealer quotations are used for these derivatives and are classified as Level 1. The Company also offers 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. For certain interest rate lock commitments, the Company uses an external valuation model that relies on internally developed inputs to estimate the fair value of its interest rate lock commitments which is based on unobservable inputs that reflect management’s assumptions and specific information about each borrower transaction and is classified in Level 3 of the hierarchy. The following table summarizes financial assets and financial liabilities measured at fair value on a recurring basis as of December 31, 2015 and 2014 , segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value (in thousands): Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) 2015 Financial assets Securities available for sale: U.S. Government sponsored agencies and enterprises $ 64,611 $ — $ 64,611 $ — States and political subdivisions 396,367 — 395,950 417 Residential mortgage-backed securities 763,549 — 763,193 356 Commercial mortgage-backed securities 130,107 — 130,107 — Corporate bonds 219,628 — 219,628 — Equity securities 10,761 10,761 — — Loans held for sale 744,727 — 744,727 — Loans 25,869 — 25,869 — Mortgage servicing rights 168,162 — — 168,162 Assets held in trust for deferred compensation 16,820 16,820 — — Derivative financial instruments 42,846 5,118 33,906 3,822 Financial liabilities Other liabilities (1) 16,333 16,333 — — Derivative financial instruments 36,974 6,050 30,924 — 2014 Financial assets Securities available for sale: U.S. Government sponsored agencies and enterprises $ 65,873 $ — $ 65,873 $ — States and political subdivisions 410,854 — 410,391 463 Residential mortgage-backed securities 720,563 — 720,053 510 Commercial mortgage-backed securities 187,662 — 187,662 — Corporate bonds 259,203 — 259,203 — Equity securities 10,597 10,597 — — Loans held for sale 737,209 — 737,209 — Mortgage servicing rights 235,402 — — 235,402 Assets held in trust for deferred compensation 16,829 16,829 — — Derivative financial instruments 46,388 1,607 39,707 5,074 Financial liabilities Other liabilities (1) 16,483 16,483 — — Derivative financial instruments 40,499 7,209 33,290 — (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 in thousands): Fair Value at December 31, 2015 Valuation Technique Unobservable Input Range (in thousands) States and political subdivisions $ 417 Discounted cash flows Credit assumption 45% Loss Residential mortgage-backed securities 356 Discounted cash flows Constant pre-payment rates (CPR) 1% - 3% Mortgage servicing rights 168,162 Discounted cash flows CPR 8.8% - 13.6% Discount rate 9.25 - 12.00 Maturity (months) 327 - 357 Delinquencies 0.51 - 3.81 Costs to service $ 61 - $ 160 Costs to service - delinquent $ 150 - $ 1,000 Derivative financial instruments (mortgage 3,822 Sales cash flows Expected closing ratio 60% - 95% interest rate lock commitments) Expected delivery price 98.18 bps - 108.37 bps The significant unobservable inputs used in the fair value measurement of the Company’s mortgage servicing rights include prepayment speeds, discount rates, maturities, delinquencies and cost to service. Significant increases in prepayment speeds, discount rates, delinquencies or cost to service would result in a significantly lower fair value measurement. Conversely, significant decreases in prepayment speeds, discount rates, delinquencies or costs to service would result in a significantly higher fair value measurement. With the exception of changes in delinquencies, which can change the cost to service, the unobservable inputs move independently of each other. Key economic assumptions used in the measuring of the fair value of the mortgage servicing rights and the sensitivity of the fair value to immediate adverse changes in those assumptions at December 31, 2015 are presented in the following table. This table does not take into account the derivatives used to economically hedge the mortgage servicing rights. (dollars in thousands, except for weighted average cost to service) December 31, 2015 Weighted average prepayment speed (CPR) 11.50 % Impact on fair value of 10% adverse change $ (6,668 ) Impact on fair value of 20% adverse change (12,836 ) Weighted average discount rate 9.56 % Impact on fair value of 10% adverse change $ (5,997 ) Impact on fair value of 20% adverse change (11,590 ) Weighted average delinquency rate 1.82 % Impact on fair value of 10% adverse change $ (1,158 ) Impact on fair value of 20% adverse change (2,341 ) Weighted average costs to service $ 83 Impact on fair value of 10% adverse change (2,990 ) Impact on fair value of 20% adverse change (5,979 ) The Company did not have any transfers between Level 1 and Level 2 of the fair value hierarchy during the year ended December 31, 2015 . 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) (in thousands): Year Ended December 31, 2015 2014 2015 2014 2015 2014 Investment Securities Mortgage Servicing Rights Derivatives Balance, beginning of period $ 973 $ 5,856 $ 235,402 $ — $ 5,074 $ — Acquired through business combination — 507 — 224,798 — 5,922 Purchases — — 823 1,096 — — Originations — — 68,690 21,285 — — Other comprehensive income — 128 — — — — Included in earnings — — (33,648 ) (11,777 ) (1,252 ) (848 ) Principal payments (200 ) (363 ) — — — — Impairment charge — (92 ) — — — — Sales — (498 ) (103,105 ) — — — Transferred out of level 3 — (4,565 ) — — — — Balance, ending of period $ 773 $ 973 $ 168,162 $ 235,402 $ 3,822 $ 5,074 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 December 31, 2015 ), 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 and lease 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 December 31, 2015 and 2014 are included in the table below (in thousands): Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) 2015 Financial assets: Impaired loans $ 76,203 $ — $ — $ 76,203 Non-financial assets: Foreclosed assets 42,351 — — 42,351 2014 Financial assets: Impaired loans $ 61,717 $ — $ — $ 61,717 Non-financial assets: Foreclosed assets 38,619 — — 38,619 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 in thousands): Fair Value at Valuation December 31, 2015 Technique Unobservable Input Range Impaired loans $ 76,203 Appraisal of collateral Appraisal adjustments - sales costs 5% - 10% Foreclosed assets 42,351 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 and interest earning deposits with banks: 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): December 31, 2015 Carrying Amount Estimated Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial Assets: Cash and due from banks $ 307,869 $ 307,869 $ 307,869 $ — $ — Interest bearing deposits with banks 73,572 73,572 73,572 — — Investment securities available for sale 1,585,023 1,585,023 10,761 1,573,489 773 Investment securities held to maturity 1,230,810 1,274,767 — 1,274,767 — Non-marketable securities - FHLB and FRB stock 114,233 114,233 — — 114,233 Loans held for sale 744,727 744,727 — 744,727 — Loans, net 9,665,858 9,626,344 — 25,869 9,600,475 Accrued interest receivable 53,457 53,457 53,457 — — Derivative financial instruments 42,846 42,846 5,118 33,906 3,822 Financial Liabilities: Non-interest bearing deposits $ 4,627,184 $ 4,627,184 $ 4,627,184 $ — $ — Interest bearing deposits 6,878,031 6,875,411 — — 6,875,411 Short-term borrowings 1,005,737 1,005,705 — — 1,005,705 Long-term borrowings 400,274 401,539 — — 401,539 Junior subordinated notes issued to capital trusts 186,164 122,696 — — 122,696 Accrued interest payable 3,186 3,186 3,186 — — Derivative financial instruments 36,974 36,974 6,050 30,924 — December 31, 2014 Carrying Amount Estimated Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial Assets: Cash and due from banks $ 256,804 $ 256,804 $ 256,804 $ — $ — Interest bearing deposits with banks 55,277 55,277 55,277 — — Investment securities available for sale 1,654,752 1,654,752 10,597 1,643,182 973 Investment securities held to maturity 993,380 1,035,061 — 1,035,061 — Non-marketable securities - FHLB and FRB stock 75,569 75,569 — — 75,569 Loans held for sale 737,209 737,209 — 737,209 — Loans, net 8,973,191 8,956,494 — — 8,956,494 Accrued interest receivable 49,065 49,065 49,065 — — Derivative financial instruments 46,388 46,388 1,607 39,707 5,074 Financial Liabilities: Non-interest bearing deposits $ 4,118,256 $ 4,118,256 $ 4,118,256 $ — $ — Interest bearing deposits 6,872,686 6,877,349 — — 6,877,349 Short-term borrowings 931,415 931,416 — — 931,416 Long-term borrowings 82,916 86,025 — — 86,025 Junior subordinated notes issued to capital trusts 185,778 122,408 — — 122,408 Accrued interest payable 3,709 3,709 3,709 — — Derivative financial instruments 40,499 40,499 7,209 33,290 —

Stock Incentive Plans

Stock Incentive Plans	12 Months Ended
	Dec. 31, 2015
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): Year Ended December 31, 2015 2014 2013 Total compensation expense for share-based payment plans during the year $ 14,123 $ 8,974 $ 5,456 Amount of related income tax benefit recognized in income 5,515 3,528 2,159 The Company adopted the Omnibus Incentive Plan (the “Omnibus Plan”) in 1997. On May 28, 2014, the Company’s stockholders approved the third amendment and restatement of the Omnibus Plan to add 3,100,000 authorized shares for a total of 11,400,000 shares of common stock authorized to be utilized in connection with awards under the Omnibus Plan to directors, officers, and employees of the Company or any of its subsidiaries. The number of shares authorized increased by 2,400,000 to 13,800,000 upon completion of the Taylor Capital merger. 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. No more than 10% of the total number of authorized shares may be issued with respect to awards granted after May 28, 2014, other than stock appreciation rights, stock options and performance-based awards, which at the date of grant are scheduled to fully vest prior to three years from the date of grant (although such awards may provide scheduled vesting earlier with respect to some of such shares and for acceleration of vesting as provided in the Omnibus Plan). As of December 31, 2015 , there were 5,147,627 shares available for future grants. Prior to 2014, annual equity-based incentive awards were typically granted to selected officers and employees mid-year. In 2014, these awards began being granted in the first quarter of the year. 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 year ended December 31, 2015 : Number of Options Weighted Average Exercise Price Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (in thousands) Options outstanding as of December 31, 2014 2,250,714 $ 27.94 4.39 Granted 336,493 31.49 Exercised (156,754 ) 21.96 Expired or cancelled (207,674 ) 39.81 Forfeited (30,348 ) 28.90 Options outstanding as of December 31, 2015 2,192,431 $ 27.77 4.44 $ 11,533 Options exercisable as of December 31, 2015 1,681,330 $ 27.29 3.22 $ 9,989 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 years ended December 31, 2015 , 2014 , and 2013 : For the Years Ended December 31, 2015 2014 2013 Risk-free interest rate 1.68 % 1.82 % 1.92 % Expected volatility of Company’s stock 29.66 % 23.16 % 25.18 % Expected dividend yield 1.82 % 1.65 % 1.73 % Expected life of options (years) 5.7 5.5 5.6 Weighted average fair value per option of options granted during the year $ 7.77 $ 5.93 $ 5.88 The total intrinsic value of options exercised during the years ended December 31, 2015 , 2014 , and 2013 was $1.7 million , $2.0 million , and $1.3 million , respectively. The following is a summary of changes in restricted shares and units for the year ended December 31, 2015 : Number of Shares Weighted Average Grant Date Fair Value Shares and Units Outstanding at December 31, 2014 801,085 $ 26.99 Granted 533,879 31.10 Vested (354,127 ) 25.13 Forfeited (35,331 ) 29.31 Shares and Units Outstanding at December 31, 2015 945,506 29.92 The total intrinsic value of restricted shares that vested during the years ended December 31, 2015 , 2014 , and 2013 was $11.4 million , $8.6 million , and $5.8 million , respectively. The Company issued 71,560 , 48,569 , 56,752 and 65,333 market-based restricted stock units in 2015, 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 awards issued in 2012 vested in the third quarter of 2015. Recipients of the 2012 award earned shares totaling 148% of the number of units issued, based on the Company’s total shareholder return relative to a specified peer group of financial institutions over the three year period. As of December 31, 2015 , there was $19.7 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 December 31, 2015 , the weighted-average period over which the unrecognized compensation expense is expected to be recognized was approximately 2.2 years.

Derivative Financial Instrument

Derivative Financial Instruments	12 Months Ended
	Dec. 31, 2015
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 statement of operations. 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 payable at December 31, 2015 was approximately $1 thousand , and the net amount payable at December 31, 2014 was approximately $1.1 million . 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 December 31, 2015 , the Company’s credit exposure relating to interest rate swaps was approximately $25.8 million , which was 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 $154 thousand at December 31, 2015 . 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. Interest rate swaps are used in order to lessen the price volatility of the mortgage servicing rights asset. The Company also uses forward commitments to buy to-be-announced mortgage securities for which the Company does not intend to take delivery of the security and will enter into an offsetting position before physical delivery to lessen the price volatility of the mortgage servicing rights asset. These derivatives are recorded at their fair value on the consolidated balance sheets in other assets with changes in fair value recorded on the consolidated statements of operations in mortgage banking revenue in non-interest income. The Company’s derivative financial instruments are summarized below as of December 31, 2015 and 2014 (in thousands): Asset Derivatives Liability Derivatives December 31, 2015 December 31, 2014 December 31, 2015 December 31, 2014 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) $ — $ — $ — $ — $ 154 $ (9 ) $ 197 $ (15 ) Stand-alone derivative instruments: (2) Interest rate swap contracts 1,034,298 27,856 1,074,930 27,456 1,025,186 (27,899 ) 1,081,787 (27,870 ) Interest rate options contracts 222,585 628 55,830 283 190,622 (585 ) 55,830 (283 ) Foreign exchange contracts 72,529 3,970 27,402 2,276 63,339 (3,671 ) 27,002 (2,109 ) Spot foreign exchange contracts 328 5 512 5 132 — 304 (18 ) Mortgage banking derivatives: Interest rate swap contracts 898,000 4,928 435,000 9,583 665,000 (3,723 ) 920,000 (2,891 ) Interest rate options contracts 35,000 33 145,000 1,607 — — — — Forward loan sale commitments 503,500 1,604 90,000 92 475,500 (1,087 ) 871,000 (7,301 ) Interest rate lock commitments 622,906 3,822 636,446 5,086 — — 8,841 (12 ) Total non-hedging derivative instruments 3,389,146 42,846 2,465,120 46,388 2,419,779 (36,965 ) 2,964,764 (40,484 ) Total $ 3,389,146 $ 42,846 $ 2,465,120 $ 46,388 $ 2,419,933 $ (36,974 ) $ 2,964,961 $ (40,499 ) (1) Derivative instruments designated to hedge fixed-rate commercial real estate loans. (2) These portfolio swaps are not designated as hedging instruments under ASC Topic 815. Amounts included in other income in the consolidated statements of operations related to derivative financial instruments were as follows (in thousands): Years Ended December 31, 2015 2014 2013 Derivative instruments designated as hedges of fair value: Interest rate swap contracts $ 6 $ 8 $ 9 Stand-alone derivative instruments: Interest rate swap contracts (3,096 ) 2,458 40 Interest rate options contracts 43 — — Foreign exchange contracts 149 96 (30 ) Spot foreign exchange contracts 18 (14 ) — Mortgage related derivatives (9,600 ) (965 ) (109 ) Total non-hedging derivative instruments (12,486 ) 1,575 (99 ) Total $ (12,480 ) $ 1,583 $ (90 ) The increase in 2015 in the amounts included in other income was primarily due to the full year impact of increased derivatives activity acquired through the mortgage operations from the Taylor Capital merger. Methods and assumptions used by the Company in estimating the fair value of its interest rate swaps are discussed in Note 18 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 December 31, 2015 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 $ 5,698 $ — $ 5,698 $ 31,446 $ — $ 31,446 Foreign currency forward contracts 2,728 — 2,728 1,805 — 1,805 Mortgage banking derivatives 1,636 — 1,636 1,087 — 1,087 Total derivatives 10,062 — 10,062 34,338 — 34,338 Repurchase agreements — — — 201,207 — 201,207 Total $ 10,062 $ — $ 10,062 $ 235,545 $ — $ 235,545 Financial Assets Financial Liabilities Net Amount Recognized Financial Instruments Collateral Net Amount Net Amount Recognized Financial Instruments Collateral Net Amount Derivatives: Counterparty A $ 3,810 $ (3,810 ) $ — $ — $ 11,137 $ (3,810 ) $ (7,327 ) $ — Counterparty B 6 (6 ) — — 7,808 (6 ) (7,802 ) — Counterparty C 3,477 (3,477 ) — — 4,963 (3,477 ) (1,486 ) — Other counterparties 2,769 (2,230 ) — 539 10,430 (2,230 ) (8,034 ) 166 Total derivatives 10,062 (9,523 ) — 539 34,338 (9,523 ) (24,649 ) 166 Repurchase agreements — — — — 201,207 — (201,207 ) — Total $ 10,062 $ (9,523 ) $ — $ 539 $ 235,545 $ (9,523 ) $ (225,856 ) $ 166 Information about the Company's financial instruments that are eligible for offset in the consolidated balance sheet as of December 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 $ 10,727 $ — $ 10,727 $ 29,916 $ — $ 29,916 Foreign currency forward contracts 1,525 — 1,525 709 — 709 Mortgage banking derivatives 1,700 — 1,700 7,302 — 7,302 Total derivatives 13,952 — 13,952 37,927 — 37,927 Repurchase agreements — — — 219,824 — 219,824 Total $ 13,952 $ — $ 13,952 $ 257,751 $ — $ 257,751 Financial Assets Financial Liabilities Net Amount Recognized Financial Instruments Collateral Net Amount Net Amount Recognized Financial Instruments Collateral Net Amount Derivatives: Counterparty A $ 13 $ (13 ) $ — $ — $ 9,556 $ (13 ) $ (9,543 ) $ — Counterparty B 145 (145 ) — — 3,736 (145 ) (3,591 ) — Counterparty C 6,123 (6,123 ) — — 10,335 (6,122 ) (4,213 ) — Other counterparties 7,671 (3,920 ) — 3,751 14,300 (3,920 ) (8,663 ) 1,717 Total derivatives 13,952 (10,201 ) — 3,751 37,927 (10,200 ) (26,010 ) 1,717 Repurchase agreements — — — — 219,824 — (219,824 ) — Total $ 13,952 $ (10,201 ) $ — $ 3,751 $ 257,751 $ (10,200 ) $ (245,834 ) $ 1,717

Operating Segments

Operating Segments	12 Months Ended
	Dec. 31, 2015
Segment Reporting [Abstract]
Operating Segments	Operating Segments The Company's operations consist of three reportable operating segments: banking, leasing and mortgage banking. The Company offers different products and services through its three segments. 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 affected by non-interest income and non-interest expenses. Non-interest income includes revenue primarily from commercial deposit and treasury management fees, trust and asset management fees, card fees and capital markets and international banking fees. Non-interest expense primarily includes salaries and employee benefits, occupancy and equipment expense, computer services and telecommunication expense, advertising and marketing expense, and professional and legal expense. In addition, the banking segment is 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 and lease 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., Celtic Leasing Corp. and MB Equipment Finance, LLC. 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, industrial, construction and transportation equipment. The leasing subsidiaries also specialize in selling third party equipment maintenance contracts to large companies. The mortgage banking segment originates mortgage loans for sale to investors and for the Company's portfolio through its retail and broker channels. This segment also services residential mortgage loans for various investors and for loans owned by the Company. The mortgage banking segment is also subject to an extensive system of laws and regulations that are intended primarily for the protection of customers. 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 Mortgage Banking Consolidated Year ended December 31, 2015 Net interest income $ 424,883 $ 11,475 $ 29,248 $ 465,606 Provision for credit losses 19,436 1,598 352 21,386 Non-interest income 127,710 76,943 117,440 322,093 Non-interest expense (1) 355,727 45,364 133,063 534,154 Income tax expense 51,647 16,255 5,309 73,211 Net income $ 125,783 $ 25,201 $ 7,964 $ 158,948 Total assets $ 13,243,710 $ 1,015,918 $ 1,325,379 $ 15,585,007 Year ended December 31, 2014 Net interest income $ 328,326 $ 12,783 $ 9,714 $ 350,823 Provision for credit losses 12,022 35 (5 ) 12,052 Non-interest income 115,411 59,806 46,088 221,305 Non-interest expense (1) 350,358 39,525 46,899 436,782 Income tax expense 21,106 12,524 3,563 37,193 Net income $ 60,251 $ 20,505 $ 5,345 $ 86,101 Total assets $ 12,698,740 $ 930,748 $ 972,611 $ 14,602,099 Year ended December 31, 2013 Net interest income $ 267,131 $ 5,205 $ — $ 272,336 Provision for credit losses (6,167 ) 363 — (5,804 ) Non-interest income 92,936 59,794 1,664 154,394 Non-interest expense 259,753 34,835 — 294,588 Income tax expense 28,201 11,290 — 39,491 Net income $ 78,280 $ 18,511 $ 1,664 $ 98,455 Total assets $ 9,167,127 $ 474,300 $ — $ 9,641,427 (1) Includes merger related expenses of $5.5 million , $34.8 million and $2.5 million in the banking segment for the years ended December 31, 2015, 2014 and 2013, respectively. Also, includes contingent consideration expense related to our acquisition of Celtic Leasing Corp. in the banking segment for the year ended December 31, 2014.

Condensed Parent Company Financ

Condensed Parent Company Financial Information	12 Months Ended
	Dec. 31, 2015
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Parent Company Financial Information	Condensed Parent Company Financial Information The condensed financial statements of MB Financial, Inc. (parent company only) are presented below: Balance Sheets (In thousands) December 31, 2015 2014 Assets Cash $ 104,819 $ 32,161 Investments in subsidiaries 2,147,396 2,143,408 Other assets 60,379 38,941 Total assets $ 2,312,594 $ 2,214,510 Liabilities and Stockholders’ Equity Short-term borrowings $ 25,000 $ — Junior subordinated notes issued to capital trusts 186,164 185,778 Other liabilities 14,146 446 Stockholders’ equity 2,087,284 2,028,286 Total liabilities and stockholders’ equity $ 2,312,594 $ 2,214,510 Statements of Operations (In thousands) Years Ended December 31, 2015 2014 2013 Dividends from subsidiaries $ 158,000 $ 101,500 $ 80,500 Interest and other income 469 3,097 4,215 Interest and other expense 10,637 14,636 7,143 Income before income tax benefit and equity in undistributed net income of subsidiaries 147,832 89,961 77,572 Income tax benefit (4,018 ) (4,590 ) (1,223 ) Income before equity in undistributed net income of subsidiaries 151,850 94,551 78,795 Equity in undistributed net income (loss) of subsidiaries 7,098 (8,450 ) 19,660 Net income 158,948 86,101 98,455 Dividends and discount accretion on preferred shares 8,000 4,000 — Net income available to common stockholders $ 150,948 $ 82,101 $ 98,455 Statements of Cash Flows (In thousands) Years Ended December 31, 2015 2014 2013 Cash Flows From Operating Activities Net income $ 158,948 $ 86,101 $ 98,455 Adjustments to reconcile net income to net cash provided by operating activities: Compensation expense for share-based payment plans 14,123 8,974 5,456 Equity in undistributed net income of subsidiaries (7,098 ) 8,450 (19,660 ) Change in other assets and other liabilities (9,145 ) (8,980 ) (1,460 ) Net cash provided by operating activities 156,828 94,545 82,791 Cash Flows From Investing Activities Net decrease in loans — — 6,960 Net cash paid in business acquisition — (101,546 ) — Net cash (used in) provided by investing activities — (101,546 ) 6,960 Cash Flows From Financing Activities Treasury stock transactions, net (53,587 ) (2,690 ) (1,672 ) Stock options exercised 499 1,034 1,014 Excess tax benefits from share-based payment arrangements 331 396 (325 ) Dividends paid on common stock (48,413 ) (34,210 ) (24,070 ) Dividends paid on preferred stock (8,000 ) (2,000 ) — Proceeds from short-term borrowings 25,000 — — Redemption of on junior subordinated notes issued to capital trusts — (45,369 ) — Net cash used in financing activities (84,170 ) (82,839 ) (25,053 ) Net increase (decrease) in cash 72,658 (89,840 ) 64,698 Cash: Beginning of year 32,161 122,001 57,303 End of year $ 104,819 $ 32,161 $ 122,001

Preferred Stock

Preferred Stock	12 Months Ended
	Dec. 31, 2015
Equity [Abstract]
Preferred Stock	Preferred Stock On August 18, 2014, in connection with the Taylor Capital merger, the Company issued one share of its Perpetual Non-Cumulative Preferred Stock, Series A (“Company Series A Preferred Stock”), in exchange for each of the 4,000,000 outstanding shares of Taylor Capital’s Perpetual Non-Cumulative Preferred Stock, Series A. Holders of the Company Series A Preferred Stock are entitled to receive, when as and if declared by the Company’s board of directors, non-cumulative cash dividends on the liquidation preference, which is $25 per share, at a rate of 8.00% per annum, payable quarterly. The Company Series A Preferred Stock is included in Tier 1 capital for regulatory capital purposes and is redeemable at the option of the Company at a redemption price of $25 per share, plus any declared and unpaid dividends, (i) in whole or in part from time to time, on any dividend payment date on or after February 15, 2018, and (ii) in whole but not in part prior to February 15, 2018, within 90 days following a “regulatory capital treatment event.” as defined in the terms of the Company Series A Preferred Stock. The Company must receive the approval of the Federal Reserve Board prior to any redemption of the Company Series A Preferred Stock.

Significant Accounting Polici32

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Basis of Financial Statement Presentation	Basis of Financial Statement Presentation: The consolidated financial statements include the accounts of the Company and its subsidiaries. Significant intercompany items and transactions have been eliminated in consolidation. The accounting and reporting policies of the Company conform to accounting principles generally accepted in the United States of America and general practices within the financial services industry. In accordance with applicable accounting standards, the Company does not consolidate statutory trusts established for the sole purpose of issuing trust preferred securities and related trust common securities. See Note 12 below for more detail. In preparing the financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheet and revenues and expenses for the year. Actual results could differ from those estimates. Areas involving the use of management’s estimates and assumptions, which are more susceptible to change in the near term include the allowance for loan and lease losses; residual value of direct finance, leveraged, and operating leases; valuation of mortgage servicing rights; income tax accounting; fair value measurements for assets and liabilities; and goodwill.
Cash and cash equivalents	Cash and cash equivalents: For purposes of reporting cash flows, cash and cash equivalents includes cash on hand, amounts due from banks (including cash items in process of clearing), interest-bearing deposits with banks, with original maturities of 90 days or less.
Investment securities	Investment securities: Securities classified as available for sale are those securities that the Company intends to hold for an indefinite period of time, but not necessarily to maturity. Any decision to sell a security classified as available for sale is based on various factors, including movements in interest rates, changes in the maturity mix of assets and liabilities, liquidity needs, regulatory capital considerations, and other factors. Securities available for sale are reported at fair value with unrealized gains or losses reported as accumulated other comprehensive income, net of the related deferred tax effect. Securities classified as held to maturity are those securities that the Company intends to hold until maturity and are reported at amortized cost. The historical cost of debt securities is adjusted for amortization of premiums and accretion of discounts over the estimated life of the security, using the level-yield method. In determining the estimated life of a mortgage-related security, certain judgments are required as to the timing and amount of future principal prepayments. These judgments are made based upon the actual performance of the underlying security and the general market consensus regarding changes in mortgage interest rates and underlying prepayment estimates. Amortization of premium and accretion of discount is included in interest income from the related security. Realized gains or losses, determined on the basis of the cost of specific securities sold, are included in earnings. The Company evaluates the portfolio for impairment each quarter. In estimating other-than-temporary losses, the Company considers the length of time and the extent to which the fair value has been less than cost, the financial condition and near-term prospects of the issuer, and whether the Company is more likely than not to sell the security before recovery of its cost basis. If the Company intends to sell an impaired security, the Company records an other-than-temporary loss in an amount equal to the entire difference between the fair value and amortized cost. If a security is determined to be other-than-temporarily impaired, but the Company does not intend to sell the security, only the credit portion of the estimated loss is recognized in earnings, with the other portion of the loss recognized in other comprehensive income.
Federal Home Loan Bank and Federal Reserve Bank stock	Federal Home Loan Bank and Federal Reserve Bank stock: The Company owns investments in the stock of the Federal Reserve Bank of Chicago (“FRB”) and the Federal Home Loan Bank of Chicago (“FHLB”). No ready market exists for these stocks, and they have no quoted market values. The Bank, as a member of the Federal Reserve System and the FHLB, is required to maintain an investment in the capital stock of the FRB and FHLB. The stock is redeemable at par by the FRB and FHLB, respectively, and is, therefore, carried at cost and periodically evaluated for impairment.
Loans held for sale	Loans held for sale: Mortgage loans originated and intended for sale in the secondary market are reflected at fair value. Changes in the fair value are recognized in mortgage banking revenue on the Company's Consolidated Statements of Operations.
Mortgage Loan Representation and Warranty Reserve	Mortgage Loan Representation and Warranty Reserve: The Company originates and sells residential mortgage loans in the secondary market. When the Company sells mortgage loans, it makes customary representations and warranties to the purchasers about various characteristics of each loan, such as the ownership of the loan, the validity of the lien securing the loan, the nature and extent of underwriting standards applied and the types of documentation being provided. These representations and warranties are generally enforceable over the life of the loan. If a defect in the origination process is identified, the Company may be required to either repurchase the loan or indemnify the purchaser for losses it sustains on the loan. If there are no such defects, the Company has no liability to the purchaser for losses it may incur on such loans. The Company maintains a representation and warranty reserve to account for the expected losses related to loans it might be required to repurchase or the indemnity payments it may have to make to purchasers. The representation and warranty reserve reflects management's best estimate of probable lifetime loss. The reserve considers both the estimate of expected losses on loans sold during the current accounting period as well as adjustments to the Company's previous estimate of expected losses on loans sold. Factors considered include borrower performance, repurchase demand behavior, and historical loan defect experience. Management monitors the adequacy of the overall reserve and makes adjustments to the level of reserve, as necessary, after consideration of other qualitative factors. At the time a loan originated for sale is funded, the representation and warranty reserve is recorded as a decrease in mortgage banking revenue on the Consolidated Statements of Operations and recorded in accrued interest, taxes and other liabilities on the Company's Consolidated Balance Sheets. Changes to the reserve are recorded as an increase or decrease to mortgage banking revenue on the Consolidated Statements of Operations.
Loans and leases	Loans and leases: Loans are stated at the amount of unpaid principal reduced by the allowance for loan and lease losses and unearned income. Direct finance and leveraged leases are included as lease loans for financial statement purposes. Direct finance leases are stated as the sum of remaining minimum lease payments from lessees plus estimated residual values less unearned lease income. Leveraged leases are stated at the sum of remaining minimum lease payments from lessees (less nonrecourse debt payments) plus estimated residual values less unearned lease income. On a quarterly basis, management reviews the lease residuals for potential impairment. Unearned lease income on direct finance and leveraged leases is recognized over the lives of the leases using the level-yield method. Loan origination and commitment fees and certain direct loan origination costs are deferred and the net amount amortized as an adjustment of the related loan’s yield. The Company is amortizing these amounts over the contractual life of the loan. Commitment fees based upon a percentage of a customer’s unused line of credit and fees related to standby letters of credit are recognized over the commitment period. Interest income is accrued daily on the Company’s outstanding loan balances. The accrual of interest on loans is discontinued at the time the loan is 90 days past due unless the credit is well-secured and in process of renewal or collection. Past due status is based on contractual terms of the loan. In all cases, loans are placed on non-accrual or charged-off at an earlier date if collection of principal or interest is considered doubtful. All interest accrued but not collected for loans that are placed on non-accrual or charged-off is reversed against interest income. For impaired loans, accrual of interest is discontinued on a loan when management believes, after considering collection efforts and other factors, the borrower’s financial condition is such that collection of interest is doubtful. Cash collections on impaired loans are generally credited to the loan balance, and no interest income is recognized on those loans until the principal balance has been determined to be collectible. Loans, other than those included in large groups of smaller-balance homogeneous loans, are considered impaired when it is probable the Company will be unable to collect all contractual principal and interest payments due in accordance with the terms of the loan agreement. Impaired loans include non-accrual loans and loans classified as a troubled debt restructuring. Impaired loans are measured based on the present value of expected future cash flows discounted at the loan’s effective interest rate or, as a practical expedient, based on the loan’s observable market price or the fair value of the collateral if the loan is collateral dependent. The amount of impairment, if any and any subsequent changes are charged against the allowance for loan and lease losses.
Troubled debt restructurings	Troubled debt restructurings: A loan is classified as a troubled debt restructuring when a borrower is experiencing financial difficulties that leads to a restructuring of the loan, and the Company grants concessions to the borrower in the restructuring that it would not otherwise consider. These concessions may include rate reductions, principal forgiveness, deferral of past due interest or principal, extension of maturity date, modification of amortization schedules, redemption of past due taxes and other actions intended to minimize potential losses. In determining whether a debtor is experiencing financial difficulties, the Company considers if the debtor is in payment default or would be in payment default in the foreseeable future without the modification, the debtor declared or is in the process of declaring bankruptcy, there is substantial doubt that the debtor will continue as a going concern, the debtor has securities that have been or are in the process of being delisted, the debtor’s entity-specific projected cash flows will not be sufficient to service any of its debt, or the debtor cannot obtain funds from sources other than the existing creditors at a market rate for debt with similar risk characteristics. In determining whether the Company has granted a concession, the Company assesses, if it does not expect to collect all amounts due, whether the current value of the collateral will satisfy the amounts owed, whether additional collateral or guarantees from the debtor will serve as adequate compensation for other terms of the restructuring, and whether the debtor otherwise has access to funds at a market rate for debt with similar risk characteristics. A loan that is modified at a market rate of interest will not be classified as troubled debt restructuring in the calendar year subsequent to the restructuring if it is in compliance with the modified terms. Payment performance prior and subsequent to the restructuring is taken into account in assessing whether it is likely that the borrower can meet the new terms. Under certain circumstances, a loan may be returned to accrual at the time of restructuring. A period of sustained repayment for at least six months generally is required for return to accrual status. 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 non-performing) through the calendar year of the restructuring that the historical payment performance has been established.
Allowance for loan and lease losses	Allowance for loan and lease losses: The allowance for loan and lease losses (ALLL) is established through a provision for credit losses charged to expense. Loans are charged against the ALLL when management believes that collectability of the principal is unlikely. The allowance is an amount that management believes will be appropriate to absorb probable losses on existing loans, based on an evaluation of the collectability of loans and prior loss and recovery experience as appropriate under GAAP. The ALLL is based on management’s evaluation of the loan portfolio giving consideration to the nature and volume of the loan portfolio, the value of underlying collateral, overall portfolio quality, review of specific problem loans, and prevailing economic conditions that may affect the borrower’s ability to pay. While management uses the best information available to make its evaluation, future adjustments to the allowance may be necessary if there are significant changes in economic conditions. In addition, regulatory agencies, as an integral part of their examination process, periodically review MB Financial Bank’s ALLL, and may require it to recognize adjustments to its allowance based on their judgments of information available to them at the time of their examinations. The ALLL is comprised of three elements: a commercial related general loss reserve; a commercial related specific reserve for impaired loans; and a consumer related reserve for smaller-balance homogenous loans. Each element is discussed below. Commercial Related General Loss Reserve - We maintain a general loan loss reserve for the four categories of commercial related loans in our portfolio - commercial loans, commercial loans collateralized by the assignment of lease payments (lease loans), commercial real estate loans and construction real estate loans. Under our loan risk rating system, each loan, with the exception of those included in large groups of smaller-balance homogeneous consumer related loans, is risk rated between one and nine by the originating loan officer, Senior Credit Management, Loan Review or loan committee. Loans rated "one" represent those loans least likely to default and a loan rated " nine " represents a loss. The probability of loans defaulting for each risk rating, sometimes referred to as default factors, are estimated based on the frequency with which loans migrate from one risk rating to another and to default status over time. We use a loan loss reserve model that incorporates the migration of loan risk ratings and historical default data over a multi-year period to develop our estimated default factors (EDFs). The model tracks annual loan rating migrations by loan type and currently uses loan risk rating migrations for 15 years. The migration data is adjusted by using average losses for an economic cycle (approximately 14 years) to develop EDFs by loan type, risk rating and maturity. EDFs are updated annually in December. EDFs are multiplied by individual loan balances in each risk-rating category and again multiplied by an historical loss given default estimate for each loan type (which incorporates estimated recoveries) to determine the appropriate allowance by loan type. This approach is applied to the commercial, lease, commercial real estate, and construction real estate components of the portfolio. To account for current economic conditions, the general allowance for loan and lease losses also includes adjustments for macroeconomic factors. Macroeconomic factors adjust the ALLL upward or downward based on the current point in the economic cycle using predictive economic data and are applied to the loan loss model through a separate allowance element for the commercial, commercial real estate, construction real estate and lease loan components. To determine our macroeconomic factors, we use specific economic data that has shown to be a statistically reliable predictor of our credit losses relative to our long term average credit losses. We tested over 20 economic variables (U.S. manufacturing index, unemployment rate, U.S. GDP growth, etc.). We annually review this data to determine that such a relationship continues to exist. We currently use the following macroeconomic indicators in our macroeconomic factor computation: Commercial loans and lease loans: total industry capacity utilization, our prior period charge-off rates and the yield on BBB-rated debt. Commercial real estate loans and construction loans: M2 Money stock, our prior period charge-off rates, the U.S. commercial real estate index and the contribution of the commercial mortgage-backed security spread to the Cleveland Financial Stress Index. Using the indicators noted above, a predicted charge-off percentage is calculated. The predicted charge-off percentage is then compared to the cycle average charge-off percentage, and a macroeconomic adjustment factor is calculated. The macroeconomic adjustment factor is applied to each commercial loan type. Each year, we review the predictive nature of the macroeconomic factors by comparing actual charge-offs to the predicted model charge-offs, re-run our regression analysis and re-calibrate the macroeconomic factors as appropriate. Commercial Related Specific Reserves - The ALLL also includes specific reserves on impaired commercial related loans. A loan is considered to be impaired when management believes, after considering collection efforts and other factors, the borrower’s financial condition is such that the collection of all contractual principal and interest payments due is doubtful. At each quarter-end, impaired loans are reviewed individually, with adjustments made to the general calculated reserve for each loan as deemed necessary. Specific adjustments are made depending on expected cash flows and/or the value of the collateral securing each loan. Generally, the Company obtains a current external appraisal (within 12 months) on real estate secured impaired loans. Our appraisal policy is designed to comply with the Interagency Appraisal and Evaluation Guidelines, most recently updated in December 2010. As part of our compliance with these guidelines, we maintain an internal Appraisal Review Department that engages and reviews all third party appraisals. In addition, each impaired commercial loan with real estate collateral is reviewed quarterly by our appraisal department to determine that the most recent valuation remains appropriate during subsequent quarters until the next appraisal is received. If considered necessary by our appraisal department, the appraised value may be further discounted to reflect current values. Other valuation techniques are also used to value non-real estate assets. Discounts may be applied in the impairment analysis used for general business assets (GBA). Examples of GBA include accounts receivable, inventory, and any marketable securities pledged. The discount is used to reflect collection risk in the event of default that may not have been included in the valuation of the asset. Consumer Related Reserves - Pools of homogeneous loans with similar risk and loss characteristics are also assessed for probable losses. These loan pools include consumer, residential real estate, home equity, credit cards and indirect vehicle loans. Migration probabilities obtained from past due roll rate analyses and historical loss rates are applied to current balances to forecast charge-offs over a one -year time horizon. We consistently apply our methodology for determining the appropriateness of the allowance for loan and lease losses but may adjust our methodologies and assumptions based on historical information related to charge-offs and management's evaluation of the loan portfolio. In this regard, we periodically review the following to validate our allowance for loan and lease losses: historical net charge-offs as they relate to prior periods' allowance for loan and lease loss, comparison of historical loan migration in past years compared to the current year, overall credit trends and ratios and any significant changes in loan concentrations. In reviewing this data, we adjust qualitative factors within our allowance methodology to appropriately reflect any changes warranted by the validation process.
Loans acquired through transfer	Acquired loans: 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 and lease 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 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. For pass rated loans (non-purchased credit-impaired loans), the difference between the estimated fair value of the loans (computed on a loan by loan basis) and the principal outstanding is accreted over the remaining life of the loans. The Company anticipates recording a provision for the acquired portfolio in future quarters related to renewing Taylor loans which will offset a substantial portion of the accretion from the pass rated loans. In accordance with ASC 310-30, for both purchased non-impaired loans and purchased impaired loans ("PCI 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.
Lease investments	Lease investments: The Company’s investment in operating leases is reported as lease investments, net. Rental income on operating leases is recognized as income over the lease term according to the provisions of the lease, which is generally on a straight-line basis. The investment in equipment in operating leases is stated at cost less depreciation using the straight-line method generally over a life of five years or less.
Premises and equipment	Premises and equipment: Premises and equipment are carried at cost less accumulated depreciation and amortization. Depreciation and amortization is computed by the straight-line method over the estimated useful lives of the assets. Useful lives generally range from three to seven years for computer equipment and software, five to 10 years for furniture and equipment, and five to 39 years for buildings and building improvements. Land improvements are amortized over a period of 15 years and leasehold improvements are amortized over the term of the related lease or the estimated useful lives of the improvements, whichever is shorter. Land is not subject to depreciation. Maintenance and repairs are charged to expense as incurred, while major improvements are capitalized and amortized to operating expense over their identified useful lives. Premises and equipment and other long-lived assets are tested for impairment whenever events or changes in circumstances indicate the carrying amount of the assets may not be recoverable from future undiscounted cash flows. If impaired, the assets are recorded at fair value. Assets acquired through a business acquisition are recorded at fair value as of the acquisition date.
Other real estate owned	Other real estate owned: Other real estate owned includes real estate assets that have been received in satisfaction of debt. Other real estate owned is initially recorded at fair value less estimated selling costs, which establishes the cost basis. Subsequently, other real estate owned is carried at the lower of the cost basis or fair value less estimated selling costs. Any valuation adjustments required at the date of transfer are charged to the allowance for loan and lease losses. Subsequently, unrealized losses and realized gains and losses on sale are included in net loss recognized on other real estate owned.
Cash surrender value of life insurance	Cash surrender value of life insurance: The Company has purchased bank-owned life insurance policies on certain executives. Bank-owned life insurance is recorded at its cash surrender value. Changes in the cash surrender values are included in non-interest income.
Goodwill	Goodwill : 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 the provisions of ASC Topic 350, goodwill is subject to at least annual assessments for impairment by applying a fair value based test. The Company reviews goodwill and other intangible assets to determine potential impairment annually, or more frequently if events and circumstances indicate that the asset might be impaired, by comparing the carrying value of the asset with the anticipated future cash flows. The Company's annual assessment is done at the unit level. As of December 31, 2015 , the annual assessment date, the Company had three reporting units: banking, leasing and mortgage banking.
Other intangibles	Other intangibles : The Company’s other intangible assets consist of core deposit and customer intangibles obtained through acquisitions. Core deposit intangibles (the portion of an acquisition purchase price which represents value assigned to the existing deposit base) have finite lives and are amortized by a 150% declining balance method over four to 20 years. Other intangible assets are tested for impairment whenever events or changes in circumstances indicate that the carrying amount of the assets may not be recoverable from future undiscounted cash flows. If impaired, the assets are recorded at fair value.
Mortgage Servicing Rights	Mortgage Servicing Rights : The Company originates and sells residential mortgage loans in the secondary market and may retain the right to service the loans sold. Servicing involves the collection of payments from individual borrowers and the distribution of those payments to the investors. Upon a sale of mortgage loans for which servicing rights are retained, the retained mortgage servicing rights asset is capitalized at the fair value of future net cash flows expected to be realized for performing servicing activities. Purchased mortgage servicing rights are recorded at the purchase price at the date of purchase and at fair value thereafter. Mortgage servicing rights do not trade in an active market with readily observable prices. The Company determines the fair value of mortgage servicing rights by estimating the fair value of the future cash flows associated with the mortgage loans being serviced. Key economic assumptions used in measuring the fair value of mortgage servicing rights include, but are not limited to, prepayment speeds, discount rates, delinquencies and cost to service. The assumptions used in the valuation model are validated on a periodic basis. The fair value is validated on a quarterly basis with an independent third party. The Company has elected to account for mortgage servicing rights using the fair value option. Changes in the fair value are recognized in mortgage banking revenue on the Company's Consolidated Statements of Operations.
FDIC indemnification asset	FDIC indemnification asset : As part of the Heritage Community Bank ("Heritage"), Benchmark Bank ("Benchmark"), Broadway Bank ("Broadway"), and New Century Bank ("New Century") transactions, MB Financial Bank entered into loss-share agreements with the FDIC. These agreements cover realized losses on loans and foreclosed real estate for specified periods. See Note 5 below for more information on these agreements, including the duration of MB Financial Bank’s loss-share coverage. These loss-share assets are measured separately from the loan portfolios because they are not contractually embedded in the loans and are not transferable with the loans should MB Financial Bank choose to dispose of them. Fair values at the acquisition dates were estimated based on projected cash flows available for loss-share based on the credit adjustments estimated for each loan pool and the loss-share percentages. The loss-share assets are also separately measured from the related loans and foreclosed real estate and recorded within other assets on the balance sheet. The corresponding accretion is recorded in other income on the statement of operations. Although these assets are contractual receivables from the FDIC, there are no contractual interest rates. When cash flow estimates are adjusted downward for a particular loan pool, the FDIC indemnification asset is increased. An allowance for loan and lease losses is established for the impairment of the loans. A provision for credit 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 claw-back liability for amounts owed to the FDIC for better than expected performance will increase or decrease accordingly.
Preferred stock	Preferred stock: Preferred stock issued in connection with the Taylor Capital Group, Inc. merger was initially recorded at fair value. Preferred dividends declared are deducted from net income for computing net income available to common stockholders and earnings per common share computations.
Treasury stock	Treasury stock: Treasury stock is recorded at acquisition cost. Gains and losses on disposition are recorded as increases or decreases to additional paid-in capital with losses in excess of previously recorded gains charged directly to retained earnings.
Derivative financial instruments and hedging activities	Derivative financial instruments and hedging activities : ASC Topic 815 establishes accounting and reporting standards requiring that every derivative instrument (including certain derivative instruments embedded in other contracts) be recorded in the balance sheet as either an asset or liability measured at its fair value. ASC Topic 815 requires that changes in the derivative’s fair value be recognized currently in earnings unless specific hedge accounting criteria are met. Accounting for qualifying hedges allows a derivative’s gains and losses to offset related results on the hedged item in the statement of operations, and requires that a company formally document, designate and assess the effectiveness of transactions that receive hedge accounting. All derivatives are recognized on the consolidated balance sheet at their fair value. On the date the derivative contract is entered into, the Company designates the derivative as either a fair value hedge (i.e. a hedge of the fair value of a recognized asset or liability), a cash flow hedge (i.e. a hedge of the variability of cash flows to be received or paid related to a recognized asset or liability), or a non-designated derivative (i.e. an instrument with no hedging designation). For a derivative designated as a fair value hedge, the changes in the fair value of the derivative and of the hedged item attributable to the hedged risk are recognized in earnings. If the derivative is designated as a cash flow hedge, the effective portions of changes in the fair value of the derivative are recorded in other comprehensive income and are recognized in the statement of operations when the hedged item affects earnings. Ineffective portions of changes in the fair value of cash flow hedges are recognized in earnings. Changes in the fair value of derivatives that are not designated as fair value or cash flow are reported currently in earnings, as noninterest income. The Company formally documents all relationships between hedging instruments and hedging items, as well as its risk management objective and strategy for undertaking various hedge transactions. This process includes linking all derivatives that are designated as fair value hedges or cash flow hedges to specific assets or liabilities on the balance sheet. The Company also formally assesses, both at the hedge’s inception and on an ongoing basis, whether the derivatives that are used in hedging transactions are highly effective in offsetting changes in fair values or cash flows of hedged items. The Company discontinues hedge accounting prospectively when it is determined that the derivative is no longer effective in offsetting changes in the fair value or cash flows of the hedged item; the derivative expires or is sold, terminated, or exercised; or management determines that designation of the derivative as a hedging instrument is no longer appropriate. When hedge accounting is discontinued because it is determined that the derivative no longer qualifies as an effective fair value hedge, the Company continues to carry the derivative on the balance sheet at its fair value, and no longer adjusts the hedged asset or liability for changes in fair value. The adjustment of the carrying amount of the hedged asset or liability is accounted for in the same manner as other components of the carrying amount of that asset or liability.
Transfers of financial assets	Transfers of financial assets : Transfers of financial assets are accounted for as sales, when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when the assets have been isolated from the Company, the transferee obtains the right (free of conditions that constrain it from taking advantage of the right) to pledge or exchange the transferred assets, and the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity.
Sale of maintenance contracts	Sale of maintenance contracts: LaSalle Business Solutions, LLC (LBS), a subsidiary of LaSalle Systems Leasing, Inc., sells third party maintenance contracts to customers. The maintenance is serviced by third party providers, with LBS maintaining no legal obligation under the contract to perform additional services. Revenues are recorded net of cost of sales, as LBS is viewed as an agent under ASC Topic 605, accepting minimal credit risk, maintaining no obligation to perform maintenance under the contracts and having no control over selection of the maintenance supplier.
Asset management and trust assets	Asset management and trust assets: Assets of the asset management and trust department, other than trust cash on deposit at MB Financial Bank, are not included in these consolidated financial statements because they are not assets of the bank.
Stock-based compensation	Stock-based compensation: The Company accounts for its equity awards in accordance with ASC Topic 718. ASC Topic 718 requires companies to recognize compensation expense related to equity awards in their statement of operations. See Note 19 below for more information.
Income taxes	Income taxes: Deferred taxes are provided on a liability method whereby deferred tax assets are recognized for deductible temporary differences, operating loss carryforwards and tax credit carryforwards, while deferred tax liabilities are recognized for taxable temporary differences. Temporary differences are the differences between the reported amounts of assets and liabilities and their tax bases. Deferred tax assets are reduced by a valuation allowance when, in the opinion of management, it is more likely than not that some portion or all of the deferred tax assets will not be realized. Deferred tax assets and liabilities are adjusted for the effects of changes in tax laws and rates on the date of enactment.
Basic and diluted earnings per common share	Basic and diluted 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.
Comprehensive income	Comprehensive income: Comprehensive income consists of net income and other comprehensive income. Other comprehensive income includes unrealized gains and losses on securities available-for-sale, net of deferred taxes, which are reported as a separate component of stockholders’ equity on the consolidated balance sheet.
Segment Reporting	Segment Reporting: An operating segment is a component of an entity that: (i) engages in business activities from which it may earn revenues and incur expenses; (ii) has operating results that are reviewed regularly by the entity’s chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance; and (iii) has discrete financial information available. As of December 31, 2015 , the Company had three reportable operating segments: banking, leasing and mortgage banking.
New authoritative accounting guidance	New authoritative accounting guidance: 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 Company adopted this new authoritative guidance on January 1, 2015, and it did not have an impact on the Company's statements of operations or financial condition. New authoritative accounting guidance under ASC Topic 310, "Receivables" amended prior guidance to require an entity to derecognize a mortgage loan and recognize a separate other receivable upon foreclosure if (i) the loan has a government guarantee that is not separable from the loan before foreclosure, (ii) at the time of foreclosure, the creditor has the intent to convey the real estate property to the guarantor and make a claim on that guarantee, and the creditor has the ability to recover under that claim, and (iii) at the time of foreclosure, any amount of the claim that is determined on the basis of the fair value of the real estate is fixed. The separate other receivable is to be measured based on the amount of the loan balance (principal and interest) expected to be recovered from the guarantor. The Company adopted this new authoritative guidance on January 1, 2015, and it did not have a material 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 Company adopted this new authoritative guidance on January 1, 2015, and it did not have an impact on the Company's statements of operations or financial condition. ASC Topic 860 "Transfers and Servicing." New authoritative accounting guidance under ASC Topic 860, "Transfers and Servicing" amended prior guidance to change the accounting for repurchase-to-maturity transactions to secured borrowing accounting and to require separate accounting for a transfer of a financial asset executed contemporaneously with a repurchase agreement with the same counterparty, which will result in secured borrowing accounting for the repurchase agreement. The new authoritative guidance also requires disclosures for a transfer of a financial asset accounted for as a sale and an agreement with the same transferee entered into in contemplation of the initial transfer that results in the transferor retaining substantially all of the exposure to the economic return on the transferred financial asset throughout the term of the transaction. In addition, it requires disclosures related to collateral, remaining contractual tenor and of the potential risks associated with repurchase agreements, securities lending transactions and repurchase-to-maturity transactions. The Company adopted this new authoritative guidance on January 1, 2015, and it did not have an impact on the Company's statements of operations or financial condition. The additional disclosures are included in Note 10. Short-Term Borrowings and Note 11. Long-Term Borrowings. ASC Topic 718 "Compensation - Stock Compensation." New authoritative accounting guidance under ASC Topic 718, "Compensation - Stock Compensation" amended prior guidance to require that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. The Company adopted this new authoritative guidance on January 1, 2015, and it did not have an impact on the Company's statements of operations or financial condition. ASC Topic 606 "Revenue from Contracts with Customers." New authoritative accounting guidance under ASC Topic 606, "Revenue from Contracts with Customers" amended prior guidance to require an entity to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The new authoritative guidance was initially effective for reporting periods after January 1, 2017 but was deferred to January 1, 2018. The Company is evaluating the new guidance but does not expect it to have a significant impact on the Company's statements of operations or financial condition. ASC Topic 810 "Consolidation." New authoritative accounting guidance under ASC Topic 810, "Consolidation" amended prior guidance over the consolidation of certain legal entities. The new authoritative guidance modifies the evaluation of whether limited partnerships and similar legal entities are variable interest entities or voting interest entities, eliminates the presumption that a general partner should consolidate a limited partnership, affects the consolidation analysis of reporting entities that are involved with variable interest entities and provides a scope exception from consolidation guidance for reporting entities with interests in legal entities that are required to comply with or operate in accordance with requirements similar to those for registered money market funds. The new authoritative guidance will be effective for reporting periods after January 1, 2016 and is not expected to have a significant impact on the Company's statements of operations or financial condition. ASC Topic 835 "Interest." New authoritative accounting guidance under ASC Topic 835, "Interest" amended prior guidance to simplify the presentation of debt issuance costs. The new authoritative guidance requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The new authoritative guidance will be effective for reporting periods after January 1, 2016 and is not expected to have a significant impact on the Company's statements of operations or financial condition. ASC Topic 805 "Business Combinations." New authoritative accounting guidance under ASC Topic 805, "Business Combinations" amended prior guidance to require that an acquirer recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. The new guidance requires that the acquirer record, in the same period’s financial statements, the effect on earnings of changes in depreciation, amortization, or other income effects, if any, as a result of the change to the provisional amounts, calculated as if the accounting had been completed at the acquisition date. It also requires an entity to present separately on the face of the income statement or disclose in the notes the portion of the amount recorded in current-period earnings by line items that would have been recorded in previous reporting periods if the adjustment to the provisional amounts had been recognized as of acquisition date. The new authoritative guidance will be effective for reporting periods after January 1, 2016 and is not expected to have a significant impact on the Company's statements of operations or financial condition. ASC Topic 825 "Financial Instruments." New authoritative accounting guidance under ASC Topic 825 "Financial Instruments" amended prior guidance to require equity investments (except those accounted for under the equity method of accounting) to be measured at fair value with changes in fair value recognized in net income. An entity may choose to measure equity investments that do not have readily determinable fair values at cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or similar investment of the same issuer. The new guidance simplifies the impairment assessment of equity investments without readily determinable fair values, requires public entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes, requires an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from changes in the instrument-specific credit risk when the entity has selected the fair value option for financial instruments and requires separate presentation of financial assets and liabilities by measurement category and form of financial asset. The new authoritative guidance will be effective for reporting periods after January 1, 2018 and is not expected to have a significant impact on the Company's statements of operations or financial condition.
Reclassifications	Reclassifications: 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.

Significant Accounting Polici33

Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Reconciliation of the Number of Shares Used in the Calculation of Basic and Diluted Earnings (Loss) Per Common 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 common share data): Years Ended December 31, 2015 2014 2013 Distributed earnings allocated to common stock $ 48,810 $ 34,422 $ 24,290 Undistributed earnings 110,138 51,679 74,165 Net income 158,948 86,101 98,455 Less: preferred stock dividends 8,000 4,000 — Net income available to common stockholders 150,948 82,101 98,455 Less: earnings and dividends allocated to participating securities 8 2 2 Earnings allocated to common stockholders $ 150,940 $ 82,099 $ 98,453 Weighted average shares outstanding for basic earnings per common share 74,177,574 62,012,196 54,509,612 Dilutive effect of equity awards 671,456 561,210 484,253 Weighted average shares outstanding for diluted earnings per common share 74,849,030 62,573,406 54,993,865 Basic earnings per common share $ 2.03 $ 1.32 $ 1.81 Diluted earnings per common share 2.02 1.31 1.79

Business Combinations (Tables)

Business Combinations (Tables)	12 Months Ended
	Dec. 31, 2015
Business Combinations [Abstract]
Assets Acquired and Liabilities Assumed	Estimated fair values of the assets acquired and liabilities assumed in the Taylor Capital transaction, as of the closing date of the transaction were as follows (in thousands): August 18, 2014 ASSETS Cash and cash equivalents $ 154,684 Investment securities available for sale 826,691 Investment securities held to maturity 22,599 Non-marketable securities - FRB and FHLB Stock 50,620 Loans held for sale 670,671 Loans 3,532,211 Leases investments, net 11,885 Premises and equipment 19,701 Goodwill 288,152 Core deposit intangible 20,079 Mortgage servicing rights 224,453 Other real estate owned 4,720 Other assets 130,478 Total assets $ 5,956,944 LIABILITIES Deposits $ 3,953,213 Short-term borrowings 1,035,800 Junior subordinated notes issued to capital trusts 80,843 Accrued expenses and other liabilities 123,028 Total liabilities $ 5,192,884 Series A preferred stock at $28.82 per share at August 15, 2014 $ 115,280 Total identifiable net assets less Series A preferred stock $ 648,780 Consideration excluding Series A preferred stock: Market value of common stock at $26.49 per share at August 15, 2014 (19,602,482 shares of common stock issued) $ 519,270 Cash paid 129,510 Total fair value of consideration, excluding Series A preferred stock $ 648,780
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period	The following table presents the acquired loans as of the acquisition date (in thousands): PCI Loans Non-PCI Loans Contractually required principal and interest payments $ 244,650 $ 3,707,463 Contractually required interest payments not expected to be collected due to estimated prepayments — (302,329 ) Nonaccretable difference (34,219 ) — Cash flows expected to be collected 210,431 3,405,134 Accretable difference (5,626 ) (77,728 ) Fair value of acquired loans $ 204,805 $ 3,327,406
Business Acquisition, Pro Forma Information	The following table provides the unaudited pro forma information for the results of operations for the years ended December 31, 2014 and 2013, as if the acquisition had occurred January 1, 2013. The pro forma results combine the historical results of Taylor Capital into the Company's consolidated statement of income including the impact of certain acquisition accounting adjustments including loan discount accretion, investment securities discount accretion, intangible assets amortization, deposit premium accretion and borrowing discount amortization. The pro forma results have been prepared for comparative purposes only and are not necessarily indicative of the results that would have been obtained had the acquisition actually occurred on January 1, 2013. No assumptions have been applied to the pro forma results of operations regarding possible revenue enhancements, provision for credit losses, expense efficiencies or asset dispositions. The merger related expenses that have been recognized are included in net income in the table below. For Years Ended December 31, 2014 2013 (in thousands) Total revenues (net interest income plus non-interest income) $ 774,778 $ 790,655 Net income 112,220 180,085

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Summary Investment Holdings	Amortized costs and fair values of investment securities were as follows (in thousands): Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value December 31, 2015 Available for Sale U.S. Government sponsored agencies and enterprises $ 63,805 $ 806 $ — $ 64,611 States and political subdivisions 373,285 23,083 (1 ) 396,367 Residential mortgage-backed securities 759,816 7,363 (3,630 ) 763,549 Commercial mortgage-backed securities 128,509 1,839 (241 ) 130,107 Corporate bonds 222,784 815 (3,971 ) 219,628 Equity securities 10,757 4 — 10,761 1,558,956 33,910 (7,843 ) 1,585,023 Held to Maturity States and political subdivisions 1,016,519 36,874 (638 ) 1,052,755 Residential mortgage-backed securities 214,291 7,721 — 222,012 1,230,810 44,595 (638 ) 1,274,767 Total $ 2,789,766 $ 78,505 $ (8,481 ) $ 2,859,790 December 31, 2014 Available for Sale U.S. Government sponsored agencies and enterprises $ 64,612 $ 1,281 $ (20 ) $ 65,873 States and political subdivisions 390,076 20,846 (68 ) 410,854 Residential mortgage-backed securities 713,413 8,977 (1,827 ) 720,563 Commercial mortgage-backed securities 186,110 1,772 (220 ) 187,662 Corporate bonds 259,526 2,428 (2,751 ) 259,203 Equity securities 10,531 66 — 10,597 1,624,268 35,370 (4,886 ) 1,654,752 Held to Maturity States and political subdivisions 752,558 30,089 (382 ) 782,265 Residential mortgage-backed securities 240,822 11,974 — 252,796 993,380 42,063 (382 ) 1,035,061 Total $ 2,617,648 $ 77,433 $ (5,268 ) $ 2,689,813
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, 2015 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 States and political subdivisions $ 219 $ (1 ) $ — $ — $ 219 $ (1 ) Residential mortgage-backed securities 357,877 (2,835 ) 43,566 (795 ) 401,443 (3,630 ) Commercial mortgage-backed securities 2,324 (5 ) 11,809 (236 ) 14,133 (241 ) Corporate bonds 73,774 (1,164 ) 18,286 (2,807 ) 92,060 (3,971 ) 434,194 (4,005 ) 73,661 (3,838 ) 507,855 (7,843 ) Held to Maturity States and political subdivisions 66,152 (519 ) 6,190 (119 ) 72,342 (638 ) Totals $ 500,346 $ (4,524 ) $ 79,851 $ (3,957 ) $ 580,197 $ (8,481 ) Unrealized losses on investment securities and the fair value of the related securities at December 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 $ 9,644 $ (20 ) $ — $ — $ 9,644 $ (20 ) States and political subdivisions 7,784 (21 ) 3,558 (47 ) 11,342 (68 ) Residential mortgage-backed securities 235,818 (1,336 ) 29,373 (491 ) 265,191 (1,827 ) Commercial mortgage-backed securities 89,509 (220 ) — — 89,509 (220 ) Corporate bonds 62,693 (1,159 ) 9,675 (1,592 ) 72,368 (2,751 ) 405,448 (2,756 ) 42,606 (2,130 ) 448,054 (4,886 ) Held to Maturity States and political subdivisions 28,786 (130 ) 14,238 (252 ) 43,024 (382 ) Totals $ 434,234 $ (2,886 ) $ 56,844 $ (2,382 ) $ 491,078 $ (5,268 )
Summary of Realized Gains on the Sale of Investment Securities Available for Sale	Net losses recognized on investment securities available for sale were as follows (in thousands): For the Years Ended December 31, 2015 2014 2013 Realized gains $ 1,470 $ 2,045 $ 15 Realized losses (1,646 ) (4,478 ) (2 ) Impairment charges — (92 ) (14 ) Net losses $ (176 ) $ (2,525 ) $ (1 )
Schedule of Remaining Contractual Maturities of Securities Included in the Securities Portfolio	The amortized cost and fair value of investment securities as of December 31, 2015 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 $ 44,600 $ 45,173 Due after one year through five years 236,143 233,095 Due after five years through ten years 40,979 42,317 Due after ten years 338,152 360,021 Equity securities 10,757 10,761 Residential and commercial mortgage-backed securities 888,325 893,656 1,558,956 1,585,023 Held to maturity: Due in one year or less 66,316 66,402 Due after one year through five years 174,620 175,547 Due after five years through ten years 116,900 121,739 Due after ten years 658,683 689,067 Residential mortgage-backed securities 214,291 222,012 1,230,810 1,274,767 Total $ 2,789,766 $ 2,859,790

Loans (Tables)

Loans (Tables)	12 Months Ended
	Dec. 31, 2015
Receivables [Abstract]
Schedule of Accounts Notes Financing Receivable	Loans consist of the following at (in thousands): December 31, 2015 2014 Commercial $ 3,616,286 $ 3,245,206 Commercial collateralized by assignment of lease payments 1,779,072 1,692,258 Commercial real estate 2,695,676 2,544,867 Residential real estate 628,169 503,287 Construction real estate 252,060 247,068 Indirect vehicle 384,095 268,840 Home equity 216,573 251,909 Other consumer 80,661 78,137 Gross loans, excluding purchased credit-impaired loans 9,652,592 8,831,572 Purchased credit-impaired loans 141,406 251,645 Total loans $ 9,793,998 $ 9,083,217
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 December 31, 2015 and 2014 (in thousands): Current 30-59 Days 60-89 Days Loans Past Due Total Total December 31, 2015 Commercial $ 3,586,372 $ 22,956 $ 97 $ 6,861 $ 29,914 $ 3,616,286 Commercial collateralized by assignment of lease payments 1,758,839 3,399 5,902 10,932 20,233 1,779,072 Commercial real estate: Healthcare 476,939 — — — — 476,939 Industrial 400,182 — — 757 757 400,939 Multifamily 399,333 622 88 934 1,644 400,977 Retail 410,958 6,189 7,411 180 13,780 424,738 Office 223,935 58 — 5,189 5,247 229,182 Other 760,530 622 82 1,667 2,371 762,901 Residential real estate 612,573 5,193 1,729 8,674 15,596 628,169 Construction real estate 252,060 — — — — 252,060 Indirect vehicle 380,899 2,085 698 413 3,196 384,095 Home equity 207,818 1,774 1,398 5,583 8,755 216,573 Other consumer 80,225 254 84 98 436 80,661 Gross loans, excluding purchased credit-impaired loans 9,550,663 43,152 17,489 41,288 101,929 9,652,592 Purchased credit-impaired loans 81,250 3,311 4,439 52,406 60,156 141,406 Total loans $ 9,631,913 $ 46,463 $ 21,928 $ 93,694 $ 162,085 $ 9,793,998 Non-performing loan aging $ 44,290 $ 9,827 $ 9,367 $ 41,177 $ 60,371 $ 104,661 December 31, 2014 Commercial $ 3,231,571 $ 8,222 $ — $ 5,413 $ 13,635 $ 3,245,206 Commercial collateralized by assignment of lease payments 1,679,991 2,025 6,095 4,147 12,267 1,692,258 Commercial real estate: Healthcare 342,984 — — — — 342,984 Industrial 333,907 944 — 3,182 4,126 338,033 Multifamily 417,504 1,377 — 1,517 2,894 420,398 Retail 432,718 2,481 652 2,325 5,458 438,176 Office 244,166 — — 2,127 2,127 246,293 Other 754,031 307 2,421 2,224 4,952 758,983 Residential real estate 485,492 8,038 2,319 7,438 17,795 503,287 Construction real estate 246,731 — — 337 337 247,068 Indirect vehicle 265,296 2,516 702 326 3,544 268,840 Home equity 242,756 2,717 1,039 5,397 9,153 251,909 Other consumer 78,106 16 12 3 31 78,137 Gross loans, excluding purchased credit-impaired loans 8,755,253 28,643 13,240 34,436 76,319 8,831,572 Purchased credit-impaired loans 158,215 4,432 585 88,413 93,430 251,645 Total loans $ 8,913,468 $ 33,075 $ 13,825 $ 122,849 $ 169,749 $ 9,083,217 Non-performing loan aging $ 46,149 $ 5,764 $ 1,099 $ 34,075 $ 40,938 $ 87,087
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 non-accrual loans and loans past due ninety days or more and still accruing by class of loans, excluding purchased credit-impaired loans, as of December 31, 2015 and 2014 (in thousands): 2015 2014 Loans past due Loans past due Non-accrual 90 days or more and still accruing Non-accrual 90 days or more and still accruing Commercial $ 24,689 $ 42 $ 14,088 $ — Commercial collateralized by assignment of lease payments 7,027 5,318 2,404 3,566 Commercial real estate: Healthcare — — — — Industrial 1,136 — 6,371 — Multifamily 3,415 — 5,333 — Office 4,496 693 3,644 464 Retail 17,594 — 2,986 — Other 1,544 195 13,541 324 Residential real estate 17,951 253 17,311 — Construction real estate — — 337 — Indirect vehicle 2,046 — 1,542 — Home equity 18,156 — 15,171 — Other consumer 11 95 5 — Total $ 98,065 $ 6,596 $ 82,733 $ 4,354
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, excluding purchased credit-impaired loans, as of December 31, 2015 and 2014 (in thousands): Pass Special Substandard Doubtful Total December 31, 2015 Commercial $ 3,373,943 $ 115,548 $ 126,795 $ — $ 3,616,286 Commercial collateralized by assignment of lease payments 1,760,674 4,367 14,031 — 1,779,072 Commercial real estate: Healthcare 472,599 4,340 — — 476,939 Industrial 380,200 19,011 1,728 — 400,939 Multifamily 396,117 595 4,265 — 400,977 Retail 393,543 13,310 17,885 — 424,738 Office 216,584 3,797 8,801 — 229,182 Other 730,713 6,193 25,995 — 762,901 Construction real estate 252,060 — — — 252,060 Total $ 7,976,433 $ 167,161 $ 199,500 $ — $ 8,343,094 December 31, 2014 Commercial $ 3,036,069 $ 178,984 $ 30,153 $ — $ 3,245,206 Commercial collateralized by assignment of lease payments 1,680,736 6,853 4,669 — 1,692,258 Commercial real estate: Healthcare 338,622 4,362 — — 342,984 Industrial 314,225 8,817 14,991 — 338,033 Multifamily 412,824 920 6,654 — 420,398 Retail 423,842 2,740 11,594 — 438,176 Office 229,947 8,524 7,822 — 246,293 Other 708,447 22,013 28,523 — 758,983 Construction real estate 246,204 527 337 — 247,068 Total $ 7,390,916 $ 233,740 $ 104,743 $ — $ 7,729,399
Recorded Investment in Loan Classes Based on Payment Activity	The following table presents the recorded investment in those loan classes based on payment activity, excluding purchased credit-impaired loans, as of December 31, 2015 and 2014 (in thousands): Performing Non-performing Total December 31, 2015 Residential real estate $ 609,965 $ 18,204 $ 628,169 Indirect vehicle 382,049 2,046 384,095 Home equity 198,417 18,156 216,573 Other consumer 80,555 106 80,661 Total $ 1,270,986 $ 38,512 $ 1,309,498 December 31, 2014 Residential real estate $ 485,976 $ 17,311 $ 503,287 Indirect vehicle 267,297 1,543 268,840 Home equity 236,739 15,170 251,909 Other consumer 78,132 5 78,137 Total $ 1,068,144 $ 34,029 $ 1,102,173
Loans Individually Evaluated for Impairment By Class of Loans	The following tables present loans individually evaluated for impairment by class of loans, excluding purchased credit-impaired loans, as of December 31, 2015 and 2014 (in thousands): December 31, 2015 Unpaid Recorded Partial Allowance for Average Interest With no related allowance recorded: Commercial $ 11,253 $ 11,253 $ — $ — $ 6,628 $ — Commercial collateralized by assignment of lease payments 3,453 2,949 504 — 1,035 54 Commercial real estate: Healthcare — — — — — — Industrial 820 757 63 — 3,467 — Multifamily 575 575 — — 1,540 17 Retail 7,872 6,131 1,741 — 2,768 — Office 1,608 1,031 577 — 1,663 — Other — — — — 965 — Residential real estate 970 970 — — 717 — Construction real estate — — — — — — Indirect vehicle — — — — — — Home equity 927 927 — — 1,000 — Other consumer — — — — — — With an allowance recorded: Commercial 23,394 23,394 — 7,523 18,820 — Commercial collateralized by assignment of lease payments 3,297 3,297 — 1,790 4,013 104 Commercial real estate: Healthcare — — — — — — Industrial — — — — 228 — Multifamily 2,155 2,155 — 17 3,307 27 Retail 16,034 16,034 — 4,926 8,885 — Office 2,929 2,929 — 1,717 2,457 — Other 592 592 — 199 9,629 — Residential real estate 12,950 12,769 181 2,634 13,484 — Construction real estate — — — — 214 — Indirect vehicle 119 119 — — 287 — Home equity 28,696 28,583 113 3,131 27,747 — Other consumer — — — — — — Total $ 117,644 $ 114,465 $ 3,179 $ 21,937 $ 108,854 $ 202 December 31, 2014 Unpaid Recorded Partial Allowance for Average Interest With no related allowance recorded: Commercial $ 9,752 $ 8,992 $ 760 $ — $ 10,324 $ — Commercial collateralized by assignment of lease payments 2,316 2,316 — — 2,569 121 Commercial real estate: Healthcare — — — — — — Industrial 9,115 5,858 3,257 — 7,870 — Multifamily 1,733 1,733 — — 1,928 52 Retail 2,025 813 1,212 — 3,465 — Office — — — — 1,127 — Other 1,479 1,465 14 — 5,249 — Residential real estate 1,941 1,941 — — 2,740 — Construction real estate — — — — 34 — Indirect vehicle — — — — — — Home equity 577 577 — — 762 — Other consumer — — — — — — With an allowance recorded: Commercial 7,987 7,987 — 2,395 14,227 — Commercial collateralized by assignment of lease payments 715 715 — 105 1,515 91 Commercial real estate: Healthcare — — — — — — Industrial 517 513 4 130 4,982 — Multifamily 5,680 4,709 971 996 6,354 131 Retail 9,264 7,897 1,367 720 8,547 — Office 4,528 2,986 1,542 545 2,833 — Other 12,612 12,527 85 136 11,022 12 Residential real estate 14,234 14,234 — 3,126 14,632 — Construction real estate 2,707 337 2,370 162 455 — Indirect vehicle 227 227 — 14 358 — Home equity 25,927 25,705 222 2,153 25,672 — Other consumer — — — — — — Total $ 113,336 $ 101,532 $ 11,804 $ 10,482 $ 126,665 $ 407
Schedule of Loans That Have Been Restructured Classified as Performing and Non-Performing	The following table presents loans that have been restructured during the year ended December 31, 2015 (dollars in thousands): December 31, 2015 Number of Pre-Modification Recorded Post-Modification Recorded Charge-offs and Performing: Commercial 6 $ 11,074 $ 11,074 $ 2,810 Home equity 17 4,809 4,809 — Total 23 $ 15,883 $ 15,883 $ 2,810 Non-Performing: Commercial real estate: Industrial 1 414 414 9 Multifamily 1 334 334 — Office 1 815 815 191 Residential real estate 1 140 140 17 Indirect vehicle 16 88 88 32 Home equity 17 2,959 2,959 306 Total 37 $ 4,750 $ 4,750 $ 555 The following table presents loans that have been restructured during the year ended December 31, 2014 (dollars in thousands): December 31, 2014 Number of Pre-Modification Recorded Post-Modification Recorded Charge-offs and Performing: Residential real estate 3 $ 588 $ 588 $ — Indirect vehicle 2 26 26 — Home equity 9 2,251 2,251 — Total 14 $ 2,865 $ 2,865 $ — Non-Performing: Commercial 1 $ 263 $ 263 $ 85 Commercial real estate: Multifamily 1 158 158 40 Residential real estate 6 1,850 1,850 246 Indirect vehicle 53 320 320 88 Home equity 27 3,813 3,813 335 Total 88 $ 6,404 $ 6,404 $ 794
Troubled Debt Restructuring Activity Rollforward	The following tables present the troubled debt restructurings activity during the year ended December 31, 2015 (dollars in thousands): Performing Non-performing Beginning balance $ 15,603 $ 25,771 Additions 15,883 4,750 Charge-offs — (359 ) Principal payments, net (1,319 ) (1,059 ) Removals (6,800 ) (1,378 ) Transfer to other real estate owned — (482 ) Transfers in 4,334 710 Transfers out (710 ) (4,334 ) Ending balance $ 26,991 $ 23,619
Type of Financing Receivable Modifications and Restructuring	The following table presents the type of modification for loans that have been restructured and the post-modification recorded investment during the year ended December 31, 2015 (dollars in thousands): December 31, 2015 Extended Maturity, Delay in Amortization Extended Payments or and Reduction Maturity and/or Extended Reduction of of Interest Rate Amortization Maturity Interest Rate Total Commercial $ — $ — $ — $ 11,074 $ 11,074 Commercial real estate: Industrial — — 414 — 414 Multifamily — 334 — — 334 Office — — 815 — 815 Residential real estate 140 — — — 140 Indirect vehicle — — — 88 88 Home equity 4,111 827 — 2,830 7,768 Total $ 4,251 $ 1,161 $ 1,229 $ 13,992 $ 20,633
Activity in the Allowance for Loan Losses	Activity in the allowance for loan and lease losses was as follows (in thousands): Year Ended December 31, 2015 2014 2013 Balance at beginning of year $ 114,057 $ 113,462 $ 128,279 Allowance for unfunded credit commitments acquired through business combination — 1,261 — Utilization of allowance for unfunded credit commitments — (637 ) — Provision for credit losses 21,386 12,052 (5,804 ) Charge-offs: Commercial 2,993 1,339 3,706 Commercial collateralized by assignment of lease payments 2,765 925 — Commercial real estate 3,563 11,438 7,517 Residential real estate 1,450 1,718 2,796 Construction real estate 34 79 980 Indirect vehicle 2,980 3,735 2,911 Home equity 1,485 3,383 3,692 Other consumer 1,941 2,128 2,073 Total charge-offs 17,211 24,745 23,675 Recoveries: Commercial 1,749 3,757 3,156 Commercial collateralized by assignment of lease payments 1,112 939 1,131 Commercial real estate 6,723 4,020 6,025 Residential real estate 515 1,190 479 Construction real estate 272 252 1,616 Indirect vehicle 1,853 1,736 1,411 Home equity 579 482 594 Other consumer 473 288 250 Total recoveries 13,276 12,664 14,662 Net charge-offs (recoveries) 3,935 12,081 9,013 Allowance for credit losses 131,508 114,057 113,462 Allowance for unfunded credit commitments (3,368 ) (4,031 ) (1,716 ) Balance at December 31, $ 128,140 $ 110,026 $ 111,746
Allowance Activity for Loan Losses by Portfolio Segment Based on Impairment Method	he 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 December 31, 2015 and 2014 (in thousands): Commercial Commercial collateralized by assignment of lease payments Commercial real estate Residential real estate Construction real estate Indirect vehicle Home equity Other Consumer Unfunded Commitments Total December 31, 2015 Allowance for credit losses: Beginning balance $ 29,571 $ 9,962 $ 41,826 $ 6,646 $ 8,918 $ 1,687 $ 9,456 $ 1,960 $ 4,031 $ 114,057 Charge-offs 2,993 2,765 3,563 1,450 34 2,980 1,485 1,941 — 17,211 Recoveries 1,749 1,112 6,723 515 272 1,853 579 473 — 13,276 Provision 10,989 2,125 489 23 5,957 1,858 (1,176 ) 1,784 (663 ) 21,386 Ending balance $ 39,316 $ 10,434 $ 45,475 $ 5,734 $ 15,113 $ 2,418 $ 7,374 $ 2,276 $ 3,368 $ 131,508 Ending allowance balance attributable to loans: Individually evaluated for impairment $ 7,523 $ 1,790 $ 6,859 $ 2,634 $ — $ — $ 3,131 $ — $ 1,392 $ 23,329 Collectively evaluated for impairment 31,228 8,644 37,198 3,100 15,019 2,418 4,243 2,276 1,976 106,102 Acquired and accounted for under ASC 310-30 (1) 565 — 1,418 — 94 — — — — 2,077 Total ending allowance balance $ 39,316 $ 10,434 $ 45,475 $ 5,734 $ 15,113 $ 2,418 $ 7,374 $ 2,276 $ 3,368 $ 131,508 Loans: Individually evaluated for impairment $ 34,647 $ 6,246 $ 30,204 $ 13,739 $ — $ 119 $ 29,510 $ — $ — $ 114,465 Collectively evaluated for impairment 3,581,639 1,772,826 2,665,472 614,430 252,060 383,976 187,063 80,661 — 9,538,127 Acquired and accounted for under ASC 310-30 (1) 24,284 — 36,362 53,156 10,891 — 14,004 2,709 — 141,406 Total ending loans balance $ 3,640,570 $ 1,779,072 $ 2,732,038 $ 681,325 $ 262,951 $ 384,095 $ 230,577 $ 83,370 $ — $ 9,793,998 December 31, 2014 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 Allowance for unfunded credit commitments acquired through business combination — — — — — — — — 1,261 1,261 Utilization of allowance for unfunded credit commitments — — — — — — — — (637 ) (637 ) Charge-offs 1,339 925 11,438 1,718 79 3,735 3,383 2,128 — 24,745 Recoveries 3,757 939 4,020 1,190 252 1,736 482 288 — 12,664 Provision 3,692 789 (2,384 ) (1,698 ) 1,889 2,024 3,879 2,170 1,691 12,052 Ending balance $ 29,571 $ 9,962 $ 41,826 $ 6,646 $ 8,918 $ 1,687 $ 9,456 $ 1,960 $ 4,031 $ 114,057 Ending allowance balance attributable to loans: Individually evaluated for impairment $ 2,395 $ 105 $ 2,527 $ 3,126 $ 162 $ 14 $ 2,153 $ — $ 1,348 $ 11,830 Collectively evaluated for impairment 26,684 9,857 38,517 3,520 8,747 1,673 7,303 1,960 2,683 100,944 Acquired and accounted for under ASC 310-30 (1) 492 — 782 — 9 — — — — 1,283 Total ending allowance balance $ 29,571 $ 9,962 $ 41,826 $ 6,646 $ 8,918 $ 1,687 $ 9,456 $ 1,960 $ 4,031 $ 114,057 Loans: Individually evaluated for impairment $ 16,979 $ 3,031 $ 38,501 $ 16,175 $ 337 $ 227 $ 26,282 $ — $ — $ 101,532 Collectively evaluated for impairment 3,228,227 1,689,227 2,506,366 487,112 246,731 268,613 225,627 78,137 — 8,730,040 Acquired and accounted for under ASC 310-30 (1) 103,582 — 80,378 14,138 31,068 — 138 22,341 — 251,645 Total ending loans balance $ 3,348,788 $ 1,692,258 $ 2,625,245 $ 517,425 $ 278,136 $ 268,840 $ 252,047 $ 100,478 $ — $ 9,083,217 (1) Loans acquired in business combinations 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 and accounted for under ASC 310-30 were as follows for the years ended December 31, 2015 and 2014 (in thousands): Year Ended December 31, 2015 2014 Balance at beginning of period $ 7,434 $ 2,337 Purchases — 5,626 Accretion (9,637 ) (2,098 ) Other (1) 14,799 1,569 Balance at end of period $ 12,596 $ 7,434 (1) Primarily includes discount transfers from non-accretable discount to accretable discount due to better than expected performance of loan pools acquired and accounted for under ASC 310-30.
Purchased Loans Disclosures	The carrying amount of loans acquired through a business combination by pool type are as follows (in thousands): December 31, 2015 Purchased Purchased Non-Credit-Impaired Total Covered loans: Consumer related $ 19,170 $ — $ 19,170 Non covered loans: Commercial loans $ 24,284 $ 708,466 $ 732,750 Commercial loans collateralized by assignment of lease payments — 91,651 91,651 Commercial real estate 36,362 658,468 694,830 Construction real estate 10,891 13,142 24,033 Consumer related 50,699 194,018 244,717 Total non-covered loans 122,236 1,665,745 1,787,981 Total acquired $ 141,406 $ 1,665,745 $ 1,807,151

Lease Investments (Tables)

Lease Investments (Tables)	12 Months Ended
	Dec. 31, 2015
Leases [Abstract]
Schedule of Lease Investments by Categories	Lease investments by categories follow (in thousands): December 31, 2015 2014 Direct finance leases: Minimum lease payments $ 392,901 $ 340,602 Estimated unguaranteed residual values 74,411 70,469 Less: unearned income (34,675 ) (31,229 ) Direct finance leases (1) $ 432,637 $ 379,842 Leveraged leases: Minimum lease payments $ 3,286 $ 10,689 Estimated unguaranteed residual values 523 1,586 Less: unearned income (126 ) (540 ) Less: related non-recourse debt (3,199 ) (10,330 ) Leveraged leases (1) $ 484 $ 1,405 Operating leases: Equipment, at cost $ 318,843 $ 257,495 Less accumulated depreciation (107,156 ) (94,662 ) Lease investments, net $ 211,687 $ 162,833 (1) Direct finance and leveraged leases are included as commercial loans collateralized by assignment of lease payments for financial statement purposes.
Schedule of Minimum Lease Payments Receivable for the Various Categories of Leases Due	The minimum lease payments receivable for the various categories of leases are due as follows (in thousands) for the years ending December 31, Direct Finance Leveraged Operating Year Leases Leases Leases Total 2016 $ 146,150 $ 2,465 $ 46,503 $ 195,118 2017 110,435 642 35,685 146,762 2018 70,320 179 24,194 94,693 2019 38,575 — 15,129 53,704 2020 11,905 — 9,491 21,396 Thereafter 15,516 — 6,983 22,499 $ 392,901 $ 3,286 $ 137,985 $ 534,172
Schedule of Residual Values for Leases by Category in the Year the Initial Lease Term Ends	At December 31, 2015 , the following reflects the residual values for leases by category in the year the initial lease term ends (in thousands): Residual Values Direct End of initial lease term Finance Leveraged Operating December 31, Leases Leases Leases Total 2016 $ 7,178 $ 400 $ 13,503 $ 21,081 2017 20,158 104 9,472 29,734 2018 16,435 19 11,338 27,792 2019 14,196 — 7,750 21,946 2020 10,499 — 10,763 21,262 Thereafter 5,945 — 17,400 23,345 $ 74,411 $ 523 $ 70,226 $ 145,160
Income from Lease Investments	Income from lease financing, net was composed of (in thousands): Years Ended December 31, 2015 2014 2013 Rental income $ 69,363 $ 64,017 $ 62,629 Equipment maintenance contracts revenue, net of cost of sales 23,027 16,441 11,071 Vendor promotional income 8,527 8,382 7,587 Other lease related revenue 5,038 2,121 1,796 Gain on sale of lease payments and leased equipment, net of residual write downs 8,042 12,899 12,002 Income on lease investments, gross 113,997 103,860 95,085 Less: depreciation on operating leases (37,416 ) (39,550 ) (33,842 ) Lease financing, net $ 76,581 $ 64,310 $ 61,243

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Schedule of Premises and Equipment	Premises and equipment consisted of (in thousands): December 31, 2015 2014 Land and land improvements $ 67,089 $ 67,630 Buildings 100,041 100,505 Furniture and equipment 139,648 124,490 Buildings and leasehold improvements 61,383 59,733 368,161 352,358 Accumulated depreciation (132,148 ) (113,981 ) Premises and equipment, net $ 236,013 $ 238,377

Goodwill and Intangibles (Table

Goodwill and Intangibles (Tables)	12 Months Ended
	Dec. 31, 2015
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 December 31, 2015 and 2014 (in thousands): December 31, 2015 2014 Balance at beginning of period $ 38,006 $ 23,428 Amortization expense (6,115 ) (5,501 ) Other intangibles from business combinations 12,921 20,079 Balance at end of period $ 44,812 $ 38,006 Gross carrying amount $ 93,292 $ 80,371 Accumulated amortization (48,480 ) (42,365 ) Net book value $ 44,812 $ 38,006
Estimated Future Amortization Expense of Other Intangible Assets	The following presents the estimated amortization expense of other intangible assets (in thousands): Years ending December 31, Amount 2016 $ 6,407 2017 5,738 2018 5,242 2019 3,685 2020 3,232 Thereafter 20,508 $ 44,812

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2015
Banking and Thrift [Abstract]
Schedule of Composition of Deposits	The composition of deposits was as follows (in thousands): December 31, 2015 2014 Demand deposit accounts, noninterest bearing $ 4,627,184 $ 4,118,256 NOW and money market accounts 4,144,633 3,913,765 Savings accounts 974,555 940,345 Certificates of deposit, $250,000 or more 877,352 838,928 Other certificates of deposit 881,491 1,179,648 Total $ 11,505,215 $ 10,990,942
Schedule of Maturities of Time Certificates	At December 31, 2015 , the scheduled maturities of certificates of deposit were as follows (in thousands): 2016 $ 1,130,389 2017 282,486 2018 199,572 2019 48,110 2020 82,941 Thereafter 15,345 $ 1,758,843

Short-Term Borrowings (Tables)

Short-Term Borrowings (Tables)	12 Months Ended
	Dec. 31, 2015
Debt Disclosure [Abstract]
Summary of Short-Term Borrowings	Short-term borrowings were as follows as of December 31, 2015 and 2014 (dollars in thousands): December 31, 2015 2014 Weighted Average Weighted Average Cost Amount Cost Amount Customer repurchase agreements 0.20 % $ 201,207 0.21 % $ 219,824 Federal Home Loan Bank advances 0.17 775,000 0.13 700,000 Federal funds purchased 0.09 4,530 0.14 11,591 Line of credit 2.18 25,000 — — 0.23 % $ 1,005,737 0.15 % $ 931,415

Long-term Borrowings (Tables)

Long-term Borrowings (Tables)	12 Months Ended
	Dec. 31, 2015
Debt Disclosure [Abstract]
Schedule of Principal Payments Due on Long-term Borrowings	The principal payments on long-term borrowings are due as follows (in thousands): Amount Years ending December 31, 2016 $ 65,374 2017 317,066 2018 8,539 2019 3,549 2020 1,373 Thereafter 4,373 $ 400,274

Junior Subordinated Notes Iss43

Junior Subordinated Notes Issued to Capital Trusts (Tables)	12 Months Ended
	Dec. 31, 2015
Debt Disclosure [Abstract]
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 December 31, 2015 (in thousands): Coal City Capital Trust I MB Financial Capital Trust II MB Financial Capital Trust III MB Financial 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 Capital Trust V MB Financial Capital Trust VI FOBB Statutory Trust III (2) TAYC Capital Trust II (3) Junior Subordinated Notes: Principal balance $ 30,928 $ 23,196 $ 5,155 $ 41,238 Annual interest rate 3-mo LIBOR + 1.30% 3-mo LIBOR + 1.30% 3-mo LIBOR + 2.80% 3-mo LIBOR + 2.68% Stated maturity date December 15, 2037 October 30, 2037 January 23, 2034 June 17, 2034 Call date December 15, 2012 October 30, 2012 January 23, 2009 June 17, 2009 Trust Preferred Securities: Face Value $ 30,000 $ 22,500 $ 5,000 $ 40,000 Annual distribution rate 3-mo LIBOR + 1.30% 3-mo LIBOR + 1.30% 3-mo LIBOR + 2.80% 3-mo LIBOR + 2.68% Issuance date September 2007 October 2007 December 2003 June 2004 Distribution dates (1) Quarterly 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 in 2006, and the junior subordinated notes issued by FOBB to FOBB Statutory Trust III were assumed by the Company upon completion of the acquisition. (3) TAYC Capital Trust II was established by Taylor Capital prior to the Company's acquisition of Taylor Capital in 2014, and the junior subordinated notes issued by Taylor Capital to TAYC Capital Trust II were assumed by the Company upon completion of the acquisition. Principal balance and face value amounts associated with TAYC Capital Trust II do not include acquisition accounting adjustments to such amounts, which in each case resulted in a discount. This discount was $7.1 million as of December 31, 2015 .

Lease Commitments and Rental 44

Lease Commitments and Rental Expense (Tables)	12 Months Ended
	Dec. 31, 2015
Leases [Abstract]
Future Minimum Annual Rental Commitments for Noncancelable Leases and Subleases	The Company leases office space for certain branch offices. At December 31, 2015 , the future minimum annual rental commitments for these noncancelable leases and subleases of such space were as follows (in thousands): Gross Sublease Net Years ending December 31, Rents Rents Rents 2016 $ 10,463 $ 577 $ 9,886 2017 9,365 504 8,861 2018 6,923 462 6,461 2019 5,909 397 5,512 2020 3,469 397 3,072 Thereafter 16,359 166 16,193 $ 52,488 $ 2,503 $ 49,985

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Schedule of Deferred Tax Assets and Liabilities	The deferred taxes consist of (in thousands): December 31, 2015 2014 Deferred tax asset: Allowance for credit losses $ 51,256 $ 43,853 Federal net operating loss carryforwards — 12,234 State net operating loss carryforwards 22,624 26,582 Other real estate owned 11,165 14,229 Stock options and restricted stock 7,317 5,904 Loans 36,386 47,668 Deferred compensation 8,550 10,620 Tax credit carryforwards 27,904 25,244 Bonus accrual 3,827 5,595 Other items 1,008 3,390 Total deferred tax asset 170,037 195,319 Valuation allowance — — Total deferred tax asset, net of valuation allowance 170,037 195,319 Deferred tax liability: Equipment leasing (132,159 ) (112,524 ) Premises and equipment (21,371 ) (18,817 ) Mortgage servicing rights (59,369 ) (64,486 ) Deferred income from FDIC-assisted transactions (43,102 ) (45,999 ) Investment securities (2,317 ) (1,802 ) FHLB stock dividends (3,207 ) (2,652 ) Core deposit intangible (7,448 ) (9,118 ) Other items (3,509 ) (2,794 ) Total deferred tax liability (272,482 ) (258,192 ) Net deferred tax liability (102,445 ) (62,873 ) Net unrealized holding gain on investment securities available for sale (10,137 ) (13,099 ) Net deferred tax liability $ (112,582 ) $ (75,972 )
Schedule of Income Taxes Attributable to Continuing Operations	Income taxes attributable to continuing operations consist of (in thousands): Years Ended December 31, 2015 2014 2013 Current expense (benefit): Federal $ 30,283 $ 25,270 $ 12,234 State 3,355 11,971 5,576 Foreign — — — 33,638 37,241 17,810 Deferred expense (benefit): Federal 28,765 3,122 17,245 State 10,808 (3,170 ) 4,436 Foreign — — — 39,573 (48 ) 21,681 $ 73,211 $ 37,193 $ 39,491
Schedule of Reconciliation Between the Statutory Federal Income Tax Rate and the Effective Tax Rate on Income From Continuing Operations	The reconciliation between the statutory federal income tax rate of 35% and the effective tax rate on income from continuing operations follows (in thousands): Years Ended December 31, 2015 2014 2013 Federal income tax expense at expected statutory rate $ 81,256 $ 43,153 $ 48,281 Increase (decrease) due to: Tax exempt income, net (16,909 ) (14,848 ) (14,200 ) State tax expense net of federal impact 9,205 5,721 6,508 Non-deductible contingent consideration 158 3,738 — Non-includable increase in cash surrender value of life insurance (1,191 ) (1,120 ) (1,111 ) Non-deductible merger expense 360 988 591 Adjustment of tax contingency reserves (969 ) (31 ) (24 ) Other items, net 1,301 (408 ) (554 ) Income tax expense $ 73,211 $ 37,193 $ 39,491
Schedule of Reconciliation of the Change in Unrecognized Tax Benefits	A reconciliation of the change in unrecognized tax benefits from January 1, 2015 to December 31, 2015 is as follows (in thousands): Unrecognized Tax Benefit Without Interest Interest on unrecognized Tax Benefit Total Unrecognized Tax Benefit Including Interest Balance at January 1, 2015 $ 981 $ 7 $ 988 Increases for tax positions of prior years — 1 1 Decreases related to prior year tax positions (927 ) — (927 ) Decreases related to lapse of statute of limitations (37 ) (6 ) (43 ) Balance at December 31, 2015 $ 17 $ 2 $ 19

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Schedule of Outstanding Financial Instruments, Contractual Amounts of Off-Balance Sheet Credit Risk	At December 31, 2015 and 2014 , the following financial instruments were outstanding, the contractual amounts of which represent off-balance sheet credit risk (in thousands): Contractual Amount 2015 2014 Commitments to extend credit: Home equity lines $ 187,478 $ 221,102 Other commitments 3,049,152 2,643,220 Letters of credit: Standby 137,945 131,810 Commercial 1,108 2,401

Regulatory Matters (Tables)

Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2015
Banking and Thrift [Abstract]
Schedule of the Required and Actual Amounts and Ratios for the Company and its Subsidiary Bank	The required and actual amounts and ratios for the Company and its bank subsidiary are presented below as of the dates indicated (dollars in thousands): To Be Well Capitalized Under For Capital Prompt Corrective Actual Adequacy Purposes Action Provisions Amount Ratio Amount Ratio Amount Ratio As of December 31, 2015 Total capital (to risk-weighted assets): Consolidated $ 1,635,548 12.54 % $ 1,043,025 8.00 % N/A N/A MB Financial Bank 1,509,453 11.62 1,039,129 8.00 $ 1,298,911 10.00 % Tier 1 capital (to risk-weighted assets): Consolidated $ 1,504,040 11.54 % 782,269 6.00 % N/A N/A MB Financial Bank 1,377,945 10.61 779,347 6.00 1,039,129 8.00 % Common equity tier 1 capital (to risk-weighted assets): Consolidated $ 1,208,938 9.27 % 586,702 4.50 % N/A N/A MB Financial Bank 1,377,945 10.61 584,510 4.50 844,292 6.50 % Tier 1 capital (to average assets): Consolidated $ 1,504,040 10.40 % 578,398 4.00 % N/A N/A MB Financial Bank 1,377,945 9.54 577,999 4.00 722,499 5.00 % As of December 31, 2014 Total capital (to risk-weighted assets): Consolidated $ 1,544,759 13.62 % $ 907,369 8.00 % N/A N/A MB Financial Bank 1,473,928 13.03 904,917 8.00 $ 1,131,146 10.00 % Tier 1 capital (to risk-weighted assets): Consolidated 1,430,702 12.61 % 453,684 4.00 % N/A N/A MB Financial Bank 1,359,871 12.02 452,459 4.00 678,688 6.00 % Tier 1 capital (to average assets): Consolidated 1,430,702 10.47 % 546,766 4.00 % N/A N/A MB Financial Bank 1,359,871 9.96 545,943 4.00 682,429 5.00 % N/A — not applicable

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2015
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 December 31, 2015 and 2014 , segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value (in thousands): Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) 2015 Financial assets Securities available for sale: U.S. Government sponsored agencies and enterprises $ 64,611 $ — $ 64,611 $ — States and political subdivisions 396,367 — 395,950 417 Residential mortgage-backed securities 763,549 — 763,193 356 Commercial mortgage-backed securities 130,107 — 130,107 — Corporate bonds 219,628 — 219,628 — Equity securities 10,761 10,761 — — Loans held for sale 744,727 — 744,727 — Loans 25,869 — 25,869 — Mortgage servicing rights 168,162 — — 168,162 Assets held in trust for deferred compensation 16,820 16,820 — — Derivative financial instruments 42,846 5,118 33,906 3,822 Financial liabilities Other liabilities (1) 16,333 16,333 — — Derivative financial instruments 36,974 6,050 30,924 — 2014 Financial assets Securities available for sale: U.S. Government sponsored agencies and enterprises $ 65,873 $ — $ 65,873 $ — States and political subdivisions 410,854 — 410,391 463 Residential mortgage-backed securities 720,563 — 720,053 510 Commercial mortgage-backed securities 187,662 — 187,662 — Corporate bonds 259,203 — 259,203 — Equity securities 10,597 10,597 — — Loans held for sale 737,209 — 737,209 — Mortgage servicing rights 235,402 — — 235,402 Assets held in trust for deferred compensation 16,829 16,829 — — Derivative financial instruments 46,388 1,607 39,707 5,074 Financial liabilities Other liabilities (1) 16,483 16,483 — — Derivative financial instruments 40,499 7,209 33,290 — (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 in thousands): Fair Value at December 31, 2015 Valuation Technique Unobservable Input Range (in thousands) States and political subdivisions $ 417 Discounted cash flows Credit assumption 45% Loss Residential mortgage-backed securities 356 Discounted cash flows Constant pre-payment rates (CPR) 1% - 3% Mortgage servicing rights 168,162 Discounted cash flows CPR 8.8% - 13.6% Discount rate 9.25 - 12.00 Maturity (months) 327 - 357 Delinquencies 0.51 - 3.81 Costs to service $ 61 - $ 160 Costs to service - delinquent $ 150 - $ 1,000 Derivative financial instruments (mortgage 3,822 Sales cash flows Expected closing ratio 60% - 95% interest rate lock commitments) Expected delivery price 98.18 bps - 108.37 bps 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 in thousands): Fair Value at Valuation December 31, 2015 Technique Unobservable Input Range Impaired loans $ 76,203 Appraisal of collateral Appraisal adjustments - sales costs 5% - 10% Foreclosed assets 42,351 Appraisal of collateral Appraisal adjustments - sales costs 5% - 10%
Schedule of Sensitivity Analysis of Fair Value, Transferor's interests in Transferred Financial Assets	Key economic assumptions used in the measuring of the fair value of the mortgage servicing rights and the sensitivity of the fair value to immediate adverse changes in those assumptions at December 31, 2015 are presented in the following table. This table does not take into account the derivatives used to economically hedge the mortgage servicing rights. (dollars in thousands, except for weighted average cost to service) December 31, 2015 Weighted average prepayment speed (CPR) 11.50 % Impact on fair value of 10% adverse change $ (6,668 ) Impact on fair value of 20% adverse change (12,836 ) Weighted average discount rate 9.56 % Impact on fair value of 10% adverse change $ (5,997 ) Impact on fair value of 20% adverse change (11,590 ) Weighted average delinquency rate 1.82 % Impact on fair value of 10% adverse change $ (1,158 ) Impact on fair value of 20% adverse change (2,341 ) Weighted average costs to service $ 83 Impact on fair value of 10% adverse change (2,990 ) Impact on fair value of 20% adverse change (5,979 )
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) (in thousands): Year Ended December 31, 2015 2014 2015 2014 2015 2014 Investment Securities Mortgage Servicing Rights Derivatives Balance, beginning of period $ 973 $ 5,856 $ 235,402 $ — $ 5,074 $ — Acquired through business combination — 507 — 224,798 — 5,922 Purchases — — 823 1,096 — — Originations — — 68,690 21,285 — — Other comprehensive income — 128 — — — — Included in earnings — — (33,648 ) (11,777 ) (1,252 ) (848 ) Principal payments (200 ) (363 ) — — — — Impairment charge — (92 ) — — — — Sales — (498 ) (103,105 ) — — — Transferred out of level 3 — (4,565 ) — — — — Balance, ending of period $ 773 $ 973 $ 168,162 $ 235,402 $ 3,822 $ 5,074
Assets Measured at Fair Value on a Nonrecurring Basis	Assets measured at fair value on a nonrecurring basis as of December 31, 2015 and 2014 are included in the table below (in thousands): Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) 2015 Financial assets: Impaired loans $ 76,203 $ — $ — $ 76,203 Non-financial assets: Foreclosed assets 42,351 — — 42,351 2014 Financial assets: Impaired loans $ 61,717 $ — $ — $ 61,717 Non-financial assets: Foreclosed assets 38,619 — — 38,619
Estimated Fair Values of Financial Instruments	The estimated fair values of financial instruments are as follows (in thousands): December 31, 2015 Carrying Amount Estimated Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial Assets: Cash and due from banks $ 307,869 $ 307,869 $ 307,869 $ — $ — Interest bearing deposits with banks 73,572 73,572 73,572 — — Investment securities available for sale 1,585,023 1,585,023 10,761 1,573,489 773 Investment securities held to maturity 1,230,810 1,274,767 — 1,274,767 — Non-marketable securities - FHLB and FRB stock 114,233 114,233 — — 114,233 Loans held for sale 744,727 744,727 — 744,727 — Loans, net 9,665,858 9,626,344 — 25,869 9,600,475 Accrued interest receivable 53,457 53,457 53,457 — — Derivative financial instruments 42,846 42,846 5,118 33,906 3,822 Financial Liabilities: Non-interest bearing deposits $ 4,627,184 $ 4,627,184 $ 4,627,184 $ — $ — Interest bearing deposits 6,878,031 6,875,411 — — 6,875,411 Short-term borrowings 1,005,737 1,005,705 — — 1,005,705 Long-term borrowings 400,274 401,539 — — 401,539 Junior subordinated notes issued to capital trusts 186,164 122,696 — — 122,696 Accrued interest payable 3,186 3,186 3,186 — — Derivative financial instruments 36,974 36,974 6,050 30,924 — December 31, 2014 Carrying Amount Estimated Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial Assets: Cash and due from banks $ 256,804 $ 256,804 $ 256,804 $ — $ — Interest bearing deposits with banks 55,277 55,277 55,277 — — Investment securities available for sale 1,654,752 1,654,752 10,597 1,643,182 973 Investment securities held to maturity 993,380 1,035,061 — 1,035,061 — Non-marketable securities - FHLB and FRB stock 75,569 75,569 — — 75,569 Loans held for sale 737,209 737,209 — 737,209 — Loans, net 8,973,191 8,956,494 — — 8,956,494 Accrued interest receivable 49,065 49,065 49,065 — — Derivative financial instruments 46,388 46,388 1,607 39,707 5,074 Financial Liabilities: Non-interest bearing deposits $ 4,118,256 $ 4,118,256 $ 4,118,256 $ — $ — Interest bearing deposits 6,872,686 6,877,349 — — 6,877,349 Short-term borrowings 931,415 931,416 — — 931,416 Long-term borrowings 82,916 86,025 — — 86,025 Junior subordinated notes issued to capital trusts 185,778 122,408 — — 122,408 Accrued interest payable 3,709 3,709 3,709 — — Derivative financial instruments 40,499 40,499 7,209 33,290 —

Stock Incentive Plans (Tables)

Stock Incentive Plans (Tables)	12 Months Ended
	Dec. 31, 2015
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): Year Ended December 31, 2015 2014 2013 Total compensation expense for share-based payment plans during the year $ 14,123 $ 8,974 $ 5,456 Amount of related income tax benefit recognized in income 5,515 3,528 2,159
Additional Information Related to Options Outstanding	The following table summarizes stock options outstanding for the year ended December 31, 2015 : Number of Options Weighted Average Exercise Price Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (in thousands) Options outstanding as of December 31, 2014 2,250,714 $ 27.94 4.39 Granted 336,493 31.49 Exercised (156,754 ) 21.96 Expired or cancelled (207,674 ) 39.81 Forfeited (30,348 ) 28.90 Options outstanding as of December 31, 2015 2,192,431 $ 27.77 4.44 $ 11,533 Options exercisable as of December 31, 2015 1,681,330 $ 27.29 3.22 $ 9,989
Assumptions Used for Options Granted	The following assumptions were used for options granted during the years ended December 31, 2015 , 2014 , and 2013 : For the Years Ended December 31, 2015 2014 2013 Risk-free interest rate 1.68 % 1.82 % 1.92 % Expected volatility of Company’s stock 29.66 % 23.16 % 25.18 % Expected dividend yield 1.82 % 1.65 % 1.73 % Expected life of options (years) 5.7 5.5 5.6 Weighted average fair value per option of options granted during the year $ 7.77 $ 5.93 $ 5.88
Summary of Changes in Restricted Shares	The following is a summary of changes in restricted shares and units for the year ended December 31, 2015 : Number of Shares Weighted Average Grant Date Fair Value Shares and Units Outstanding at December 31, 2014 801,085 $ 26.99 Granted 533,879 31.10 Vested (354,127 ) 25.13 Forfeited (35,331 ) 29.31 Shares and Units Outstanding at December 31, 2015 945,506 29.92

Derivative Financial Instrume50

Derivative Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Derivative Financial Instruments	The Company’s derivative financial instruments are summarized below as of December 31, 2015 and 2014 (in thousands): Asset Derivatives Liability Derivatives December 31, 2015 December 31, 2014 December 31, 2015 December 31, 2014 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) $ — $ — $ — $ — $ 154 $ (9 ) $ 197 $ (15 ) Stand-alone derivative instruments: (2) Interest rate swap contracts 1,034,298 27,856 1,074,930 27,456 1,025,186 (27,899 ) 1,081,787 (27,870 ) Interest rate options contracts 222,585 628 55,830 283 190,622 (585 ) 55,830 (283 ) Foreign exchange contracts 72,529 3,970 27,402 2,276 63,339 (3,671 ) 27,002 (2,109 ) Spot foreign exchange contracts 328 5 512 5 132 — 304 (18 ) Mortgage banking derivatives: Interest rate swap contracts 898,000 4,928 435,000 9,583 665,000 (3,723 ) 920,000 (2,891 ) Interest rate options contracts 35,000 33 145,000 1,607 — — — — Forward loan sale commitments 503,500 1,604 90,000 92 475,500 (1,087 ) 871,000 (7,301 ) Interest rate lock commitments 622,906 3,822 636,446 5,086 — — 8,841 (12 ) Total non-hedging derivative instruments 3,389,146 42,846 2,465,120 46,388 2,419,779 (36,965 ) 2,964,764 (40,484 ) Total $ 3,389,146 $ 42,846 $ 2,465,120 $ 46,388 $ 2,419,933 $ (36,974 ) $ 2,964,961 $ (40,499 ) (1) Derivative instruments designated to hedge 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 other income in the consolidated statements of operations related to derivative financial instruments were as follows (in thousands): Years Ended December 31, 2015 2014 2013 Derivative instruments designated as hedges of fair value: Interest rate swap contracts $ 6 $ 8 $ 9 Stand-alone derivative instruments: Interest rate swap contracts (3,096 ) 2,458 40 Interest rate options contracts 43 — — Foreign exchange contracts 149 96 (30 ) Spot foreign exchange contracts 18 (14 ) — Mortgage related derivatives (9,600 ) (965 ) (109 ) Total non-hedging derivative instruments (12,486 ) 1,575 (99 ) Total $ (12,480 ) $ 1,583 $ (90 )
Schedule of Derivative Instruments	Information about the Company's financial instruments that are eligible for offset in the consolidated balance sheet as of December 31, 2015 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 $ 5,698 $ — $ 5,698 $ 31,446 $ — $ 31,446 Foreign currency forward contracts 2,728 — 2,728 1,805 — 1,805 Mortgage banking derivatives 1,636 — 1,636 1,087 — 1,087 Total derivatives 10,062 — 10,062 34,338 — 34,338 Repurchase agreements — — — 201,207 — 201,207 Total $ 10,062 $ — $ 10,062 $ 235,545 $ — $ 235,545 Financial Assets Financial Liabilities Net Amount Recognized Financial Instruments Collateral Net Amount Net Amount Recognized Financial Instruments Collateral Net Amount Derivatives: Counterparty A $ 3,810 $ (3,810 ) $ — $ — $ 11,137 $ (3,810 ) $ (7,327 ) $ — Counterparty B 6 (6 ) — — 7,808 (6 ) (7,802 ) — Counterparty C 3,477 (3,477 ) — — 4,963 (3,477 ) (1,486 ) — Other counterparties 2,769 (2,230 ) — 539 10,430 (2,230 ) (8,034 ) 166 Total derivatives 10,062 (9,523 ) — 539 34,338 (9,523 ) (24,649 ) 166 Repurchase agreements — — — — 201,207 — (201,207 ) — Total $ 10,062 $ (9,523 ) $ — $ 539 $ 235,545 $ (9,523 ) $ (225,856 ) $ 166 Information about the Company's financial instruments that are eligible for offset in the consolidated balance sheet as of December 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 $ 10,727 $ — $ 10,727 $ 29,916 $ — $ 29,916 Foreign currency forward contracts 1,525 — 1,525 709 — 709 Mortgage banking derivatives 1,700 — 1,700 7,302 — 7,302 Total derivatives 13,952 — 13,952 37,927 — 37,927 Repurchase agreements — — — 219,824 — 219,824 Total $ 13,952 $ — $ 13,952 $ 257,751 $ — $ 257,751 Financial Assets Financial Liabilities Net Amount Recognized Financial Instruments Collateral Net Amount Net Amount Recognized Financial Instruments Collateral Net Amount Derivatives: Counterparty A $ 13 $ (13 ) $ — $ — $ 9,556 $ (13 ) $ (9,543 ) $ — Counterparty B 145 (145 ) — — 3,736 (145 ) (3,591 ) — Counterparty C 6,123 (6,123 ) — — 10,335 (6,122 ) (4,213 ) — Other counterparties 7,671 (3,920 ) — 3,751 14,300 (3,920 ) (8,663 ) 1,717 Total derivatives 13,952 (10,201 ) — 3,751 37,927 (10,200 ) (26,010 ) 1,717 Repurchase agreements — — — — 219,824 — (219,824 ) — Total $ 13,952 $ (10,201 ) $ — $ 3,751 $ 257,751 $ (10,200 ) $ (245,834 ) $ 1,717

Operating Segments (Tables)

Operating Segments (Tables)	12 Months Ended
	Dec. 31, 2015
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 Mortgage Banking Consolidated Year ended December 31, 2015 Net interest income $ 424,883 $ 11,475 $ 29,248 $ 465,606 Provision for credit losses 19,436 1,598 352 21,386 Non-interest income 127,710 76,943 117,440 322,093 Non-interest expense (1) 355,727 45,364 133,063 534,154 Income tax expense 51,647 16,255 5,309 73,211 Net income $ 125,783 $ 25,201 $ 7,964 $ 158,948 Total assets $ 13,243,710 $ 1,015,918 $ 1,325,379 $ 15,585,007 Year ended December 31, 2014 Net interest income $ 328,326 $ 12,783 $ 9,714 $ 350,823 Provision for credit losses 12,022 35 (5 ) 12,052 Non-interest income 115,411 59,806 46,088 221,305 Non-interest expense (1) 350,358 39,525 46,899 436,782 Income tax expense 21,106 12,524 3,563 37,193 Net income $ 60,251 $ 20,505 $ 5,345 $ 86,101 Total assets $ 12,698,740 $ 930,748 $ 972,611 $ 14,602,099 Year ended December 31, 2013 Net interest income $ 267,131 $ 5,205 $ — $ 272,336 Provision for credit losses (6,167 ) 363 — (5,804 ) Non-interest income 92,936 59,794 1,664 154,394 Non-interest expense 259,753 34,835 — 294,588 Income tax expense 28,201 11,290 — 39,491 Net income $ 78,280 $ 18,511 $ 1,664 $ 98,455 Total assets $ 9,167,127 $ 474,300 $ — $ 9,641,427 (1) Includes merger related expenses of $5.5 million , $34.8 million and $2.5 million in the banking segment for the years ended December 31, 2015, 2014 and 2013, respectively. Also, includes contingent consideration expense related to our acquisition of Celtic Leasing Corp. in the banking segment for the year ended December 31, 2014.

Condensed Parent Company Fina52

Condensed Parent Company Financial Information (Tables)	12 Months Ended
	Dec. 31, 2015
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Balance Sheets	Balance Sheets (In thousands) December 31, 2015 2014 Assets Cash $ 104,819 $ 32,161 Investments in subsidiaries 2,147,396 2,143,408 Other assets 60,379 38,941 Total assets $ 2,312,594 $ 2,214,510 Liabilities and Stockholders’ Equity Short-term borrowings $ 25,000 $ — Junior subordinated notes issued to capital trusts 186,164 185,778 Other liabilities 14,146 446 Stockholders’ equity 2,087,284 2,028,286 Total liabilities and stockholders’ equity $ 2,312,594 $ 2,214,510
Condensed Statements of Operations	Statements of Operations (In thousands) Years Ended December 31, 2015 2014 2013 Dividends from subsidiaries $ 158,000 $ 101,500 $ 80,500 Interest and other income 469 3,097 4,215 Interest and other expense 10,637 14,636 7,143 Income before income tax benefit and equity in undistributed net income of subsidiaries 147,832 89,961 77,572 Income tax benefit (4,018 ) (4,590 ) (1,223 ) Income before equity in undistributed net income of subsidiaries 151,850 94,551 78,795 Equity in undistributed net income (loss) of subsidiaries 7,098 (8,450 ) 19,660 Net income 158,948 86,101 98,455 Dividends and discount accretion on preferred shares 8,000 4,000 — Net income available to common stockholders $ 150,948 $ 82,101 $ 98,455
Condensed Statements of Cash Flows	Statements of Cash Flows (In thousands) Years Ended December 31, 2015 2014 2013 Cash Flows From Operating Activities Net income $ 158,948 $ 86,101 $ 98,455 Adjustments to reconcile net income to net cash provided by operating activities: Compensation expense for share-based payment plans 14,123 8,974 5,456 Equity in undistributed net income of subsidiaries (7,098 ) 8,450 (19,660 ) Change in other assets and other liabilities (9,145 ) (8,980 ) (1,460 ) Net cash provided by operating activities 156,828 94,545 82,791 Cash Flows From Investing Activities Net decrease in loans — — 6,960 Net cash paid in business acquisition — (101,546 ) — Net cash (used in) provided by investing activities — (101,546 ) 6,960 Cash Flows From Financing Activities Treasury stock transactions, net (53,587 ) (2,690 ) (1,672 ) Stock options exercised 499 1,034 1,014 Excess tax benefits from share-based payment arrangements 331 396 (325 ) Dividends paid on common stock (48,413 ) (34,210 ) (24,070 ) Dividends paid on preferred stock (8,000 ) (2,000 ) — Proceeds from short-term borrowings 25,000 — — Redemption of on junior subordinated notes issued to capital trusts — (45,369 ) — Net cash used in financing activities (84,170 ) (82,839 ) (25,053 ) Net increase (decrease) in cash 72,658 (89,840 ) 64,698 Cash: Beginning of year 32,161 122,001 57,303 End of year $ 104,819 $ 32,161 $ 122,001

Significant Accounting Polici53

Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2015Subsidiaryratingcategoryelementeconomic_variableofficenote
Troubled debt restructurings:
Number of notes into which a note is restructured (in instruments) | note	2
Allowance for loan and lease losses:
Number of elements in allowance for loan losses | element	3
Number of categories of commercial related loans for which a general loan loss reserve | category	4
Loan risk rating that represents those loans least likely to default	1
Loan risk rating that represents a loss	9
Period of loan risk rating migration (in years)	15 years
Period for computing average losses (in years)	14 years
Number of indicators for which correlation to charge-offs is tested | economic_variable	20
Time horizon over which forecast is applied (in years)	1 year
Minimum
Loans and leases:
Period past due for discontinuance of interest accrual on loans (in days)	90 days
Troubled debt restructurings:
Period of sustained repayment for a note to get accrual status (in months)	6 months
Finite-Lived Intangible Assets, Net [Abstract]
Finite-lived intangible assets, useful life	4 years
Maximum
Cash and cash equivalents:
Term of original maturity to classify instrument as cash equivalent (in days)	90 days
Allowance for loan and lease losses:
Period in which external appraisal on real estate secured impaired loan was obtained (in months)	12 months
Lease investments:
Life of leased equipment under operating leases (in years)	5 years
Finite-Lived Intangible Assets, Net [Abstract]
Finite-lived intangible assets, useful life	20 years
MB Financial Bank
Finite-Lived Intangible Assets [Line Items]
Number of wholly owned subsidiaries | Subsidiary	4
ILLINOIS | MB Financial Bank
Finite-Lived Intangible Assets [Line Items]
Number of banking offices | office	80

Significant Accounting Polici54

Significant Accounting Policies (Details 2)	12 Months Ended
	Dec. 31, 2015
Land improvements
Premises and Equipment
Estimated useful life	15 years
Minimum | Computer equipment and software
Premises and Equipment
Estimated useful life	3 years
Minimum | Software
Premises and Equipment
Estimated useful life	3 years
Minimum | Furniture and equipment
Premises and Equipment
Estimated useful life	5 years
Minimum | Buildings and building improvements
Premises and Equipment
Estimated useful life	5 years
Maximum | Computer equipment and software
Premises and Equipment
Estimated useful life	7 years
Maximum | Software
Premises and Equipment
Estimated useful life	7 years
Maximum | Furniture and equipment
Premises and Equipment
Estimated useful life	10 years
Maximum | Buildings and building improvements
Premises and Equipment
Estimated useful life	39 years

Significant Accounting Polici55

Significant Accounting Policies (Details 3) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015$ / shares	Dec. 31, 2015reporting_unit	Dec. 31, 2015segment	Dec. 31, 2015shares	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)$ / sharesshares	Dec. 31, 2013USD ($)$ / sharesshares
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income					$ 158,948	$ 86,101	$ 98,455
Less: preferred stock dividends					8,000	4,000
Net income available to common stockholders					150,948	82,101	98,455
Earnings allocated to common stockholders					150,940	$ 82,099	$ 98,453
Weighted average shares outstanding for basic earnings per common share | shares				74,177,574		62,012,196	54,509,612
Weighted average shares outstanding for diluted earnings per common share | shares				74,849,030		62,573,406	54,993,865
Basic earnings per common share (dollars per share) | $ / shares	$ 2.03					$ 1.32	$ 1.81
Diluted earnings per common share (dollars per share) | $ / shares	$ 2.02					$ 1.31	$ 1.79
Segment Reporting
Number of reportable segments		3	3
Common Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Distributed earnings allocated to common stock					48,810	$ 34,422	$ 24,290
Undistributed earnings					110,138	51,679	74,165
Net income					158,948	86,101	98,455
Net income available to common stockholders					150,948	$ 82,101	$ 98,455
Weighted average shares outstanding for basic earnings per common share | shares				74,177,574		62,012,196	54,509,612
Dilutive effect of equity awards | shares				671,456		561,210	484,253
Weighted average shares outstanding for diluted earnings per common share | shares				74,849,030		62,573,406	54,993,865
Participating Securities
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Less: earnings and dividends allocated to participating securities					$ 8	$ 2	$ 2

Business Combinations (Details)

Business Combinations (Details)	Jun. 30, 2016USD ($)	Nov. 20, 2015USD ($)officeshares	Aug. 18, 2014USD ($)shares	Aug. 15, 2014shares	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Business combination
Goodwill					$ 725,070,000	$ 711,521,000	$ 711,521,000
Taylor Capital Group, Inc.
Business combination
Amount called by each warrant or right			$ 4.08
Cash paid			129,510,000
Payments to acquire businesses, employee stock options and warrants			4,400,000
Goodwill			288,152,000
Business combination, professional and legal fees						7,100,000	2,400,000
Business combination, merger expenses					5,500,000	$ 34,800,000	$ 2,500,000
Core deposit intangible			$ 20,079,000
MSA Holdings, LLC
Business combination
Goodwill					$ 13,500,000
Percentage of equity interest acquired					100.00%
Core deposit intangible					$ 8,800,000
Common Stock | Taylor Capital Group, Inc.
Business combination
Number of securities called by each warrant or right | shares			0.64318
Business acquisition, shares of common stock issued | shares			19,600,000	19,602,482
Restricted stock | Taylor Capital Group, Inc.
Business combination
Cash paid			$ 3,700,000
American Chartered Bancorp, Inc.
Business combination
Amount called by each warrant or right		$ 9.30
Number of banking offices | office		15
Business combination, assets					2,800,000,000
Business combination, loans					2,000,000,000
Business combination, deposits					$ 2,300,000,000
American Chartered Bancorp, Inc. | Common Stock
Business combination
Number of securities called by each warrant or right | shares		0.2732
Forecast | American Chartered Bancorp, Inc.
Business combination
Cash paid	$ 100,000,000

Business Combinations (Details

Business Combinations (Details 2) - USD ($) $ / shares in Units, $ in Thousands	Aug. 18, 2014	Aug. 15, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
ASSETS
Goodwill			$ 725,070	$ 711,521	$ 711,521
LIABILITIES
Series A preferred stock at $28.82 per share at August 15, 2014			$ 115,280	$ 115,280
Preferred stock, par value (in dollars per share)			$ 0.01	$ 0.01
Taylor Capital Group, Inc.
ASSETS
Cash and cash equivalents	$ 154,684
Investment securities available for sale	826,691
Investment securities held to maturity	22,599
Non-marketable securities - FRB and FHLB Stock	50,620
Loans held for sale	670,671
Loans	3,532,211
Leases investments, net	11,885
Premises and equipment	19,701
Goodwill	288,152
Core deposit intangible	20,079
Mortgage servicing rights	224,453
Other real estate owned	4,720
Other assets	130,478
Total assets	5,956,944
LIABILITIES
Deposits	3,953,213
Short-term borrowings	1,035,800
Junior subordinated notes issued to capital trusts	80,843
Accrued expenses and other liabilities	123,028
Total liabilities	5,192,884
Total identifiable net assets less Series A preferred stock	648,780
Market value of common stock at $26.49 per share at August 15, 2014 (19,602,482 shares of common stock issued)	519,270
Cash paid	129,510
Total fair value of consideration, excluding Series A preferred stock	648,780
Taylor Capital Group, Inc. | Series A Preferred Stock
LIABILITIES
Series A preferred stock at $28.82 per share at August 15, 2014	$ 115,280
Preferred stock, par value (in dollars per share)		$ 28.82
Common Stock | Taylor Capital Group, Inc.
LIABILITIES
Share price		$ 26.49
Business acquisition, shares of common stock issued	19,600,000	19,602,482

Business Combinations (Detail58

Business Combinations (Details 3) - Taylor Capital Group, Inc. $ in Thousands	Aug. 18, 2014USD ($)
PCI Loans
Fair value of acquired loans	$ 3,532,211
Substandard
PCI Loans
Contractually required principal and interest payments	244,650
Nonaccretable difference	(34,219)
Cash flows expected to be collected	210,431
Accretable difference	(5,626)
Fair value of acquired loans	204,805
Pass
Non-PCI Loans
Contractually required principal and interest payments	3,707,463
Contractually required interest payments not expected to be collected due to estimated prepayments	(302,329)
Cash flows expected to be collected	3,405,134
Accretable difference	(77,728)
Fair value of acquired loans	$ 3,327,406

Business Combinations (Detail59

Business Combinations (Details 4) - Taylor Capital Group, Inc. - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Business combination
Total revenues (net interest income plus non-interest income)	$ 774,778	$ 790,655
Net income	$ 112,220	$ 180,085

Restrictions on Cash and Due 60

Restrictions on Cash and Due From Banks (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Cash and Cash Equivalents [Abstract]
Required reserve balances in cash or on deposits with Federal Reserve Bank	$ 148	$ 127.2

Investment Securities (Details)

Investment Securities (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Available for Sale
Amortized Cost		$ 1,558,956	$ 1,624,268
Gross Unrealized Gains		33,910	35,370
Gross Unrealized Losses		(7,843)	(4,886)
Fair Value		1,585,023	1,654,752
Held to Maturity
Amortized Cost		1,230,810	993,380
Gross Unrealized Gains		44,595	42,063
Gross Unrealized Losses		(638)	(382)
Fair Value		1,274,767	1,035,061
Total
Amortized Cost		2,789,766	2,617,648
Gross Unrealized Gains		78,505	77,433
Gross Unrealized Losses		(8,481)	(5,268)
Fair Value		2,859,790	2,689,813
Transfer of investment securities held to maturity to investment securities available for sale		0	273,471	$ 0
U.S. Government sponsored agencies and enterprises
Available for Sale
Amortized Cost		63,805	64,612
Gross Unrealized Gains		806	1,281
Gross Unrealized Losses		0	(20)
Fair Value		64,611	65,873
States and political subdivisions
Available for Sale
Amortized Cost		373,285	390,076
Gross Unrealized Gains		23,083	20,846
Gross Unrealized Losses		(1)	(68)
Fair Value		396,367	410,854
Held to Maturity
Amortized Cost		1,016,519	752,558
Gross Unrealized Gains		36,874	30,089
Gross Unrealized Losses		(638)	(382)
Fair Value		$ 1,052,755	782,265
Total
Percentage of securities consisting general obligation issues		95.00%
Transferred security at fair value	$ 291,200
Transfer of investment securities held to maturity to investment securities available for sale	273,471
Held-to-maturity securities, realized loss	3,200
Residential mortgage-backed securities
Available for Sale
Amortized Cost		$ 759,816	713,413
Gross Unrealized Gains		7,363	8,977
Gross Unrealized Losses		(3,630)	(1,827)
Fair Value		763,549	720,563
Held to Maturity
Amortized Cost		214,291	240,822
Gross Unrealized Gains		7,721	11,974
Gross Unrealized Losses		0	0
Fair Value		222,012	252,796
Commercial mortgage-backed securities
Available for Sale
Amortized Cost		128,509	186,110
Gross Unrealized Gains		1,839	1,772
Gross Unrealized Losses		(241)	(220)
Fair Value		130,107	187,662
Corporate bonds
Available for Sale
Amortized Cost		222,784	259,526
Gross Unrealized Gains		815	2,428
Gross Unrealized Losses		(3,971)	(2,751)
Fair Value		219,628	259,203
Equity securities
Available for Sale
Amortized Cost		10,757	10,531
Gross Unrealized Gains		4	66
Gross Unrealized Losses		0	0
Fair Value		$ 10,761	$ 10,597
Certain longer-term and lower-coupon investment securities
Available for Sale
Fair Value	$ 451,600
Geographic Concentration Risk | States and political subdivisions | Securities Portfolio
Total
Percentage of investments issued by states and political subdivisions that were within the state of Illinois		21.00%

Investment Securities (Details

Investment Securities (Details 2) $ in Thousands	Dec. 31, 2015USD ($)Security_Position	Dec. 31, 2014USD ($)Security_Position
Available for Sale
Less Than 12 Months, Fair Value	$ 434,194	$ 405,448
Less Than 12 Months, Unrealized Losses	(4,005)	(2,756)
12 Months or More, Fair Value	73,661	42,606
12 Months or More, Unrealized Losses	(3,838)	(2,130)
Total Fair Value	507,855	448,054
Total Unrealized Losses	(7,843)	(4,886)
Total
Less Than 12 Months, Fair Value	500,346	434,234
Less Than 12 Months, Unrealized Losses	(4,524)	(2,886)
12 Months or More, Fair Value	79,851	56,844
12 Months or More, Unrealized Losses	(3,957)	(2,382)
Total Fair Value	580,197	491,078
Total Unrealized Losses	$ (8,481)	$ (5,268)
Number of security positions in the investment portfolio in an unrealized loss position | Security_Position	193	168
U.S. Government sponsored agencies and enterprises
Available for Sale
Less Than 12 Months, Fair Value		$ 9,644
Less Than 12 Months, Unrealized Losses		(20)
12 Months or More, Fair Value		0
12 Months or More, Unrealized Losses		0
Total Fair Value		9,644
Total Unrealized Losses		(20)
States and political subdivisions
Available for Sale
Less Than 12 Months, Fair Value	$ 219	7,784
Less Than 12 Months, Unrealized Losses	(1)	(21)
12 Months or More, Fair Value	0	3,558
12 Months or More, Unrealized Losses	0	(47)
Total Fair Value	219	11,342
Total Unrealized Losses	(1)	(68)
Held to Maturity
Less Than 12 Months, Fair Value	66,152	28,786
Less than 12 Months, Unrealized Losses	(519)	(130)
12 Months or More, Fair Value	6,190	14,238
12 Months or More, Unrealized Losses	(119)	(252)
Total Fair Value	72,342	43,024
Total Unrealized Losses	(638)	(382)
Residential mortgage-backed securities
Available for Sale
Less Than 12 Months, Fair Value	357,877	235,818
Less Than 12 Months, Unrealized Losses	(2,835)	(1,336)
12 Months or More, Fair Value	43,566	29,373
12 Months or More, Unrealized Losses	(795)	(491)
Total Fair Value	401,443	265,191
Total Unrealized Losses	(3,630)	(1,827)
Commercial mortgage-backed securities
Available for Sale
Less Than 12 Months, Fair Value	2,324	89,509
Less Than 12 Months, Unrealized Losses	(5)	(220)
12 Months or More, Fair Value	11,809	0
12 Months or More, Unrealized Losses	(236)	0
Total Fair Value	14,133	89,509
Total Unrealized Losses	(241)	(220)
Corporate bonds
Available for Sale
Less Than 12 Months, Fair Value	73,774	62,693
Less Than 12 Months, Unrealized Losses	(1,164)	(1,159)
12 Months or More, Fair Value	18,286	9,675
12 Months or More, Unrealized Losses	(2,807)	(1,592)
Total Fair Value	92,060	72,368
Total Unrealized Losses	$ (3,971)	$ (2,751)

Investment Securities (Detail63

Investment Securities (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]
Realized gains	$ 1,470	$ 2,045	$ 15
Realized losses	(1,646)	(4,478)	(2)
Impairment charges	0	(92)	(14)
Net losses	$ (176)	$ (2,525)	$ (1)

Investment Securities (Detail64

Investment Securities (Details 4) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Amortized Cost, Available for sale
Due in one year or less	$ 44,600
Due after one year through five years	236,143
Due after five years through ten years	40,979
Due after ten years	338,152
Amortized Cost	1,558,956	$ 1,624,268
Fair Value, Available for sale
Due in one year or less	45,173
Due after one year through five years	233,095
Due after five years through ten years	42,317
Due after ten years	360,021
Fair Value	1,585,023	1,654,752
Amortized Cost, Held to maturity
Due in one year or less	66,316
Due after one year through five years	174,620
Due after five years through ten years	116,900
Due after ten years	658,683
Investment securities held to maturity	1,230,810	993,380
Fair value, Held to maturity
Due in one year or less	66,402
Due after one year through five years	175,547
Due after five years through ten years	121,739
Due after ten years	689,067
Fair Value	1,274,767	1,035,061
Total
Amortized Cost	2,789,766	2,617,648
Fair Value	2,859,790	2,689,813
Investment securities	1,400,000	1,500,000
Securities required to be pledged	878,200	980,400
Investment securities pledged as collateral for Federal Home Loan Bank advances	108,800	226,900
Equity securities
Amortized Cost, Available for sale
Amortized Cost	10,757	10,531
Fair Value, Available for sale
Fair Value	10,761	10,597
Residential and commercial mortgage-backed securities
Amortized Cost, Available for sale
Amortized Cost	888,325
Fair Value, Available for sale
Fair Value	893,656
Residential mortgage-backed securities
Amortized Cost, Available for sale
Amortized Cost	759,816	713,413
Fair Value, Available for sale
Fair Value	763,549	720,563
Amortized Cost, Held to maturity
Investment securities held to maturity	214,291	240,822
Fair value, Held to maturity
Fair Value	$ 222,012	$ 252,796

Loans (Details)

Loans (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)investmentrating	Dec. 31, 2014USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, excluding purchased credit-impaired loans	$ 1,309,498	$ 1,102,173
Gross loans, excluding purchased credit-impaired loans	9,652,592	8,831,572
Purchased credit impaired loans	141,406	251,645
Total loans	$ 9,793,998	9,083,217
Number of highest rating categories by rating services company | investmentrating	1
Number of highest rating categories to be achieved for classification as investment grade companies | investmentrating	4
Loans and leases receivable related parties	$ 75,000	63,100
Loans and leases receivable related parties additions	28,600
Loans and leases receivable related parties collections	$ (16,600)
Minimum percentage of collateral pledge of first mortgage loans as per agreement	133.00%
Minimum percentage of collateral pledge of home equity loans as per agreement	250.00%
Loans pledged as collateral for Federal Home Loan Bank advances	$ 3,200,000	2,000,000
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, excluding purchased credit-impaired loans	3,616,286	3,245,206
Total loans	3,640,570	3,348,788
Commercial collateralized by assignment of lease payments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, excluding purchased credit-impaired loans	1,779,072	1,692,258
Total loans	1,779,072	1,692,258
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, excluding purchased credit-impaired loans	2,695,676	2,544,867
Total loans	2,732,038	2,625,245
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, excluding purchased credit-impaired loans	628,169	503,287
Total loans	681,325	517,425
Construction real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, excluding purchased credit-impaired loans	252,060	247,068
Total loans	262,951	278,136
Indirect vehicle
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, excluding purchased credit-impaired loans	384,095	268,840
Total loans	384,095	268,840
Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, excluding purchased credit-impaired loans	216,573	251,909
Total loans	230,577	252,047
Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, excluding purchased credit-impaired loans	80,661	78,137
Total loans	$ 83,370	$ 100,478

Loans (Details 2)

Loans (Details 2) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, excluding purchased credit-impairment loans	$ 1,309,498	$ 1,102,173
Total loans, excluding purchased credit impaired loans	9,652,592	8,831,572
Total loans	9,793,998	9,083,217
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	3,586,372	3,231,571
30-59 Days Past Due	22,956	8,222
60-89 Days Past Due	97	0
Loans Past Due 90 Days or More	6,861	5,413
Total Past Due	29,914	13,635
Total loans, excluding purchased credit-impairment loans	3,616,286	3,245,206
Total loans	3,640,570	3,348,788
Commercial collateralized by assignment of lease payments
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,758,839	1,679,991
30-59 Days Past Due	3,399	2,025
60-89 Days Past Due	5,902	6,095
Loans Past Due 90 Days or More	10,932	4,147
Total Past Due	20,233	12,267
Total loans, excluding purchased credit-impairment loans	1,779,072	1,692,258
Total loans	1,779,072	1,692,258
Healthcare
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	476,939	342,984
30-59 Days Past Due	0	0
60-89 Days Past Due	0	0
Loans Past Due 90 Days or More	0	0
Total Past Due	0	0
Total loans, excluding purchased credit-impairment loans	476,939	342,984
Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	400,182	333,907
30-59 Days Past Due	0	944
60-89 Days Past Due	0	0
Loans Past Due 90 Days or More	757	3,182
Total Past Due	757	4,126
Total loans, excluding purchased credit-impairment loans	400,939	338,033
Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	399,333	417,504
30-59 Days Past Due	622	1,377
60-89 Days Past Due	88	0
Loans Past Due 90 Days or More	934	1,517
Total Past Due	1,644	2,894
Total loans, excluding purchased credit-impairment loans	400,977	420,398
Retail
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	410,958	432,718
30-59 Days Past Due	6,189	2,481
60-89 Days Past Due	7,411	652
Loans Past Due 90 Days or More	180	2,325
Total Past Due	13,780	5,458
Total loans, excluding purchased credit-impairment loans	424,738	438,176
Office
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	223,935	244,166
30-59 Days Past Due	58	0
60-89 Days Past Due	0	0
Loans Past Due 90 Days or More	5,189	2,127
Total Past Due	5,247	2,127
Total loans, excluding purchased credit-impairment loans	229,182	246,293
Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	760,530	754,031
30-59 Days Past Due	622	307
60-89 Days Past Due	82	2,421
Loans Past Due 90 Days or More	1,667	2,224
Total Past Due	2,371	4,952
Total loans, excluding purchased credit-impairment loans	762,901	758,983
Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	612,573	485,492
30-59 Days Past Due	5,193	8,038
60-89 Days Past Due	1,729	2,319
Loans Past Due 90 Days or More	8,674	7,438
Total Past Due	15,596	17,795
Total loans, excluding purchased credit-impairment loans	628,169	503,287
Total loans	681,325	517,425
Construction real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	252,060	246,731
30-59 Days Past Due	0	0
60-89 Days Past Due	0	0
Loans Past Due 90 Days or More	0	337
Total Past Due	0	337
Total loans, excluding purchased credit-impairment loans	252,060	247,068
Total loans	262,951	278,136
Indirect vehicle
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	380,899	265,296
30-59 Days Past Due	2,085	2,516
60-89 Days Past Due	698	702
Loans Past Due 90 Days or More	413	326
Total Past Due	3,196	3,544
Total loans, excluding purchased credit-impairment loans	384,095	268,840
Total loans	384,095	268,840
Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	207,818	242,756
30-59 Days Past Due	1,774	2,717
60-89 Days Past Due	1,398	1,039
Loans Past Due 90 Days or More	5,583	5,397
Total Past Due	8,755	9,153
Total loans, excluding purchased credit-impairment loans	216,573	251,909
Total loans	230,577	252,047
Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	80,225	78,106
30-59 Days Past Due	254	16
60-89 Days Past Due	84	12
Loans Past Due 90 Days or More	98	3
Total Past Due	436	31
Total loans, excluding purchased credit-impairment loans	80,661	78,137
Total loans	83,370	100,478
Gross loans, excluding purchased credit-impaired loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	9,550,663
30-59 Days Past Due	43,152
60-89 Days Past Due	17,489
Loans Past Due 90 Days or More	41,288
Total Past Due	101,929
Gross loans, excluding purchased credit-impaired loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		8,755,253
30-59 Days Past Due		28,643
60-89 Days Past Due		13,240
Loans Past Due 90 Days or More		34,436
Total Past Due		76,319
Total loans, excluding purchased credit impaired loans	9,652,592	8,831,572
Purchased credit-impaired loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	37,200	71,700
Total loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	9,631,913	8,913,468
30-59 Days Past Due	46,463	33,075
60-89 Days Past Due	21,928	13,825
Loans Past Due 90 Days or More	93,694	122,849
Total Past Due	162,085	169,749
Total loans	9,793,998	9,083,217
Non-performing loan aging
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	44,290	46,149
30-59 Days Past Due	9,827	5,764
60-89 Days Past Due	9,367	1,099
Loans Past Due 90 Days or More	41,177	34,075
Total Past Due	60,371	40,938
Total loans, excluding purchased credit-impairment loans	38,512	34,029
Total loans	104,661	87,087
Non-performing loan aging | Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, excluding purchased credit-impairment loans	18,204	17,311
Non-performing loan aging | Indirect vehicle
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, excluding purchased credit-impairment loans	2,046	1,543
Non-performing loan aging | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, excluding purchased credit-impairment loans	18,156	15,170
Non-performing loan aging | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, excluding purchased credit-impairment loans	106	5
Purchased credit-impaired loans | Purchased credit-impaired loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	81,250	158,215
30-59 Days Past Due	3,311	4,432
60-89 Days Past Due	4,439	585
Loans Past Due 90 Days or More	52,406	88,413
Total Past Due	60,156	93,430
Total loans	$ 141,406	$ 251,645

Loans (Details 3)

Loans (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable Recorded Investment Non Accrual and Past Due [Abstract]
Reduction in interest income associated with loans on nonaccrual status	$ 3,700	$ 4,300	$ 4,700
Commercial
Financing Receivable Recorded Investment Non Accrual and Past Due [Abstract]
Nonaccrual	24,689	14,088
Loans past due 90 days or more and still accruing	42	0
Commercial collateralized by assignment of lease payments
Financing Receivable Recorded Investment Non Accrual and Past Due [Abstract]
Nonaccrual	7,027	2,404
Loans past due 90 days or more and still accruing	5,318	3,566
Healthcare
Financing Receivable Recorded Investment Non Accrual and Past Due [Abstract]
Nonaccrual	0	0
Loans past due 90 days or more and still accruing	0	0
Industrial
Financing Receivable Recorded Investment Non Accrual and Past Due [Abstract]
Nonaccrual	1,136	6,371
Loans past due 90 days or more and still accruing	0	0
Multifamily
Financing Receivable Recorded Investment Non Accrual and Past Due [Abstract]
Nonaccrual	3,415	5,333
Loans past due 90 days or more and still accruing	0	0
Office
Financing Receivable Recorded Investment Non Accrual and Past Due [Abstract]
Nonaccrual	4,496	3,644
Loans past due 90 days or more and still accruing	693	464
Retail
Financing Receivable Recorded Investment Non Accrual and Past Due [Abstract]
Nonaccrual	17,594	2,986
Loans past due 90 days or more and still accruing	0	0
Other
Financing Receivable Recorded Investment Non Accrual and Past Due [Abstract]
Nonaccrual	1,544	13,541
Loans past due 90 days or more and still accruing	195	324
Residential real estate
Financing Receivable Recorded Investment Non Accrual and Past Due [Abstract]
Nonaccrual	17,951	17,311
Loans past due 90 days or more and still accruing	253	0
Construction real estate
Financing Receivable Recorded Investment Non Accrual and Past Due [Abstract]
Nonaccrual	0	337
Loans past due 90 days or more and still accruing	0	0
Indirect vehicle
Financing Receivable Recorded Investment Non Accrual and Past Due [Abstract]
Nonaccrual	2,046	1,542
Loans past due 90 days or more and still accruing	0	0
Home equity
Financing Receivable Recorded Investment Non Accrual and Past Due [Abstract]
Nonaccrual	18,156	15,171
Loans past due 90 days or more and still accruing	0	0
Other consumer
Financing Receivable Recorded Investment Non Accrual and Past Due [Abstract]
Nonaccrual	11	5
Loans past due 90 days or more and still accruing	95	0
Total loans
Financing Receivable Recorded Investment Non Accrual and Past Due [Abstract]
Nonaccrual	98,065	82,733
Loans past due 90 days or more and still accruing	$ 6,596	$ 4,354

Loans (Details 4)

Loans (Details 4) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	$ 1,309,498	$ 1,102,173
Non-performing substandard and doubtful loans	59,600	49,100
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	3,616,286	3,245,206
Commercial collateralized by assignment of lease payments
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	1,779,072	1,692,258
Healthcare
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	476,939	342,984
Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	400,939	338,033
Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	400,977	420,398
Retail
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	424,738	438,176
Office
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	229,182	246,293
Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	762,901	758,983
Construction real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	252,060	247,068
Pass
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	7,976,433	7,390,916
Pass | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	3,373,943	3,036,069
Pass | Commercial collateralized by assignment of lease payments
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	1,760,674	1,680,736
Pass | Healthcare
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	472,599	338,622
Pass | Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	380,200	314,225
Pass | Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	396,117	412,824
Pass | Retail
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	393,543	423,842
Pass | Office
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	216,584	229,947
Pass | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	730,713	708,447
Pass | Construction real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	252,060	246,204
Special Mention
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	167,161	233,740
Special Mention | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	115,548	178,984
Special Mention | Commercial collateralized by assignment of lease payments
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	4,367	6,853
Special Mention | Healthcare
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	4,340	4,362
Special Mention | Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	19,011	8,817
Special Mention | Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	595	920
Special Mention | Retail
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	13,310	2,740
Special Mention | Office
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	3,797	8,524
Special Mention | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	6,193	22,013
Special Mention | Construction real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	0	527
Substandard
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	199,500	104,743
Substandard | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	126,795	30,153
Substandard | Commercial collateralized by assignment of lease payments
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	14,031	4,669
Substandard | Healthcare
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	0	0
Substandard | Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	1,728	14,991
Substandard | Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	4,265	6,654
Substandard | Retail
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	17,885	11,594
Substandard | Office
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	8,801	7,822
Substandard | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	25,995	28,523
Substandard | Construction real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	0	337
Doubtful
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	0	0
Doubtful | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	0	0
Doubtful | Commercial collateralized by assignment of lease payments
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	0	0
Doubtful | Healthcare
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	0	0
Doubtful | Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	0	0
Doubtful | Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	0	0
Doubtful | Retail
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	0	0
Doubtful | Office
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	0	0
Doubtful | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	0	0
Doubtful | Construction real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	0	0
Total
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	8,343,094	7,729,399
Total | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	3,616,286	3,245,206
Total | Commercial collateralized by assignment of lease payments
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	1,779,072	1,692,258
Total | Healthcare
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	476,939	342,984
Total | Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	400,939	338,033
Total | Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	400,977	420,398
Total | Retail
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	424,738	438,176
Total | Office
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	229,182	246,293
Total | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	762,901	758,983
Total | Construction real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	$ 252,060	$ 247,068

Loans (Details 5)

Loans (Details 5) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, excluding purchased credit-impaired loans	$ 1,309,498	$ 1,102,173
Amount of mortgage loans in process of foreclosure	2,400	10,100
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, excluding purchased credit-impaired loans	628,169	503,287
Indirect vehicle
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, excluding purchased credit-impaired loans	384,095	268,840
Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, excluding purchased credit-impaired loans	216,573	251,909
Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, excluding purchased credit-impaired loans	80,661	78,137
Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, excluding purchased credit-impaired loans	1,270,986	1,068,144
Performing | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, excluding purchased credit-impaired loans	609,965	485,976
Performing | Indirect vehicle
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, excluding purchased credit-impaired loans	382,049	267,297
Performing | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, excluding purchased credit-impaired loans	198,417	236,739
Performing | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, excluding purchased credit-impaired loans	80,555	78,132
Non-performing loan aging
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, excluding purchased credit-impaired loans	38,512	34,029
Non-performing loan aging | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, excluding purchased credit-impaired loans	18,204	17,311
Non-performing loan aging | Indirect vehicle
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, excluding purchased credit-impaired loans	2,046	1,543
Non-performing loan aging | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, excluding purchased credit-impaired loans	18,156	15,170
Non-performing loan aging | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, excluding purchased credit-impaired loans	$ 106	$ 5

Loans (Details 6)

Loans (Details 6) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	$ 117,644	$ 113,336
Recorded Investment	114,465	101,532
Partial Charge-offs	3,179	11,804
Allowance for Loan and Lease Losses Allocated	21,937	10,482
Average Recorded Investment	108,854	126,665	$ 136,500
Interest Income Recognized	202	407
Interest income recognized on cash basis	202	407	$ 1,900
Restructured loans	20,633
Performing
Loans individually evaluated for impairment by class of loans
Restructured loans	27,000	15,600
Non-performing loan aging
Loans individually evaluated for impairment by class of loans
Restructured loans	23,600	25,800
Commercial
Loans individually evaluated for impairment by class of loans
Restructured loans	11,074
Industrial
Loans individually evaluated for impairment by class of loans
Restructured loans	414
Multifamily
Loans individually evaluated for impairment by class of loans
Restructured loans	334
Office
Loans individually evaluated for impairment by class of loans
Restructured loans	815
Residential real estate
Loans individually evaluated for impairment by class of loans
Restructured loans	140
Indirect vehicle
Loans individually evaluated for impairment by class of loans
Restructured loans	88
Home equity
Loans individually evaluated for impairment by class of loans
Restructured loans	7,768
Impaired financing receivable with no allowance | Commercial
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	11,253	9,752
Recorded Investment	11,253	8,992
Partial Charge-offs	0	760
Allowance for Loan and Lease Losses Allocated	0	0
Average Recorded Investment	6,628	10,324
Interest Income Recognized	0	0
Impaired financing receivable with no allowance | Commercial collateralized by assignment of lease payments
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	3,453	2,316
Recorded Investment	2,949	2,316
Partial Charge-offs	504	0
Allowance for Loan and Lease Losses Allocated	0	0
Average Recorded Investment	1,035	2,569
Interest Income Recognized	54	121
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 and Lease Losses Allocated	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Impaired financing receivable with no allowance | Industrial
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	820	9,115
Recorded Investment	757	5,858
Partial Charge-offs	63	3,257
Allowance for Loan and Lease Losses Allocated	0	0
Average Recorded Investment	3,467	7,870
Interest Income Recognized	0	0
Impaired financing receivable with no allowance | Multifamily
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	575	1,733
Recorded Investment	575	1,733
Partial Charge-offs	0	0
Allowance for Loan and Lease Losses Allocated	0	0
Average Recorded Investment	1,540	1,928
Interest Income Recognized	17	52
Impaired financing receivable with no allowance | Retail
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	7,872	2,025
Recorded Investment	6,131	813
Partial Charge-offs	1,741	1,212
Allowance for Loan and Lease Losses Allocated	0	0
Average Recorded Investment	2,768	3,465
Interest Income Recognized	0	0
Impaired financing receivable with no allowance | Office
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	1,608	0
Recorded Investment	1,031	0
Partial Charge-offs	577	0
Allowance for Loan and Lease Losses Allocated	0	0
Average Recorded Investment	1,663	1,127
Interest Income Recognized	0	0
Impaired financing receivable with no allowance | Other
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	0	1,479
Recorded Investment	0	1,465
Partial Charge-offs	0	14
Allowance for Loan and Lease Losses Allocated	0	0
Average Recorded Investment	965	5,249
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	970	1,941
Recorded Investment	970	1,941
Partial Charge-offs	0	0
Allowance for Loan and Lease Losses Allocated	0	0
Average Recorded Investment	717	2,740
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	0	0
Recorded Investment	0	0
Partial Charge-offs	0	0
Allowance for Loan and Lease Losses Allocated	0	0
Average Recorded Investment	0	34
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 and Lease Losses Allocated	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Impaired financing receivable with no allowance | Home equity
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	927	577
Recorded Investment	927	577
Partial Charge-offs	0	0
Allowance for Loan and Lease Losses Allocated	0	0
Average Recorded Investment	1,000	762
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 and Lease Losses Allocated	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Impaired financing receivable with allowance | Commercial
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	23,394	7,987
Recorded Investment	23,394	7,987
Partial Charge-offs	0	0
Allowance for Loan and Lease Losses Allocated	7,523	2,395
Average Recorded Investment	18,820	14,227
Interest Income Recognized	0	0
Impaired financing receivable with allowance | Commercial collateralized by assignment of lease payments
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	3,297	715
Recorded Investment	3,297	715
Partial Charge-offs	0	0
Allowance for Loan and Lease Losses Allocated	1,790	105
Average Recorded Investment	4,013	1,515
Interest Income Recognized	104	91
Impaired financing receivable with 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 and Lease Losses Allocated	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Impaired financing receivable with allowance | Industrial
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	0	517
Recorded Investment	0	513
Partial Charge-offs	0	4
Allowance for Loan and Lease Losses Allocated	0	130
Average Recorded Investment	228	4,982
Interest Income Recognized	0	0
Impaired financing receivable with allowance | Multifamily
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	2,155	5,680
Recorded Investment	2,155	4,709
Partial Charge-offs	0	971
Allowance for Loan and Lease Losses Allocated	17	996
Average Recorded Investment	3,307	6,354
Interest Income Recognized	27	131
Impaired financing receivable with allowance | Retail
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	16,034	9,264
Recorded Investment	16,034	7,897
Partial Charge-offs	0	1,367
Allowance for Loan and Lease Losses Allocated	4,926	720
Average Recorded Investment	8,885	8,547
Interest Income Recognized	0	0
Impaired financing receivable with allowance | Office
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	2,929	4,528
Recorded Investment	2,929	2,986
Partial Charge-offs	0	1,542
Allowance for Loan and Lease Losses Allocated	1,717	545
Average Recorded Investment	2,457	2,833
Interest Income Recognized	0	0
Impaired financing receivable with allowance | Other
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	592	12,612
Recorded Investment	592	12,527
Partial Charge-offs	0	85
Allowance for Loan and Lease Losses Allocated	199	136
Average Recorded Investment	9,629	11,022
Interest Income Recognized	0	12
Impaired financing receivable with allowance | Residential real estate
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	12,950	14,234
Recorded Investment	12,769	14,234
Partial Charge-offs	181	0
Allowance for Loan and Lease Losses Allocated	2,634	3,126
Average Recorded Investment	13,484	14,632
Interest Income Recognized	0	0
Impaired financing receivable with allowance | Construction real estate
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	0	2,707
Recorded Investment	0	337
Partial Charge-offs	0	2,370
Allowance for Loan and Lease Losses Allocated	0	162
Average Recorded Investment	214	455
Interest Income Recognized	0	0
Impaired financing receivable with allowance | Indirect vehicle
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	119	227
Recorded Investment	119	227
Partial Charge-offs	0	0
Allowance for Loan and Lease Losses Allocated	0	14
Average Recorded Investment	287	358
Interest Income Recognized	0	0
Impaired financing receivable with allowance | Home equity
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	28,696	25,927
Recorded Investment	28,583	25,705
Partial Charge-offs	113	222
Allowance for Loan and Lease Losses Allocated	3,131	2,153
Average Recorded Investment	27,747	25,672
Interest Income Recognized	0	0
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 and Lease Losses Allocated	0	0
Average Recorded Investment	0	0
Interest Income Recognized	$ 0	$ 0

Loans (Details 7)

Loans (Details 7) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)noteloan	Dec. 31, 2014USD ($)noteloan
Restructured loans
Number of separate notes restructured into A/B by the company | note	2	2
Minimum period of sustained repayment required to return the note to accrual status (in months)	6 months
Restructured loans representing A/B structures	$ 985	$ 1,000
Number of A/B structures represented by restructured loans | loan	1	1
Redefaulted loans	$ 225
Period past due of recorded redefaulted loans (in days)	90 days
Troubled Debt Restructuring Activity [Roll Forward]
Ending balance	$ 20,633
Performing
Restructured loans
Number of Loans | loan	23	14
Pre-Modification Recorded Investment	$ 15,883	$ 2,865
Post-Modification Recorded Investment	15,883	2,865
Charge-offs and Specific Reserves	2,810	0
Troubled Debt Restructuring Activity [Roll Forward]
Beginning balance	15,603
Additions	15,883
Charge-offs	0
Principal payments, net	(1,319)
Removals	(6,800)
Transfer to other real estate owned	0
Transfers in	4,334
Transfers out	(710)
Ending balance	$ 26,991	$ 15,603
Non-performing loan aging
Restructured loans
Number of Loans | loan	37	88
Pre-Modification Recorded Investment	$ 4,750	$ 6,404
Post-Modification Recorded Investment	4,750	6,404
Charge-offs and Specific Reserves	555	794
Troubled Debt Restructuring Activity [Roll Forward]
Beginning balance	25,771
Additions	4,750
Charge-offs	(359)
Principal payments, net	(1,059)
Removals	(1,378)
Transfer to other real estate owned	(482)
Transfers in	710
Transfers out	(4,334)
Ending balance	23,619	$ 25,771
Commercial
Troubled Debt Restructuring Activity [Roll Forward]
Ending balance	$ 11,074
Commercial | Performing
Restructured loans
Number of Loans | loan	6
Pre-Modification Recorded Investment	$ 11,074
Post-Modification Recorded Investment	11,074
Charge-offs and Specific Reserves	2,810
Commercial | Non-performing loan aging
Restructured loans
Number of Loans | loan		1
Pre-Modification Recorded Investment		$ 263
Post-Modification Recorded Investment		263
Charge-offs and Specific Reserves		$ 85
Industrial
Troubled Debt Restructuring Activity [Roll Forward]
Ending balance	$ 414
Industrial | Non-performing loan aging
Restructured loans
Number of Loans | loan	1
Pre-Modification Recorded Investment	$ 414
Post-Modification Recorded Investment	414
Charge-offs and Specific Reserves	9
Multifamily
Troubled Debt Restructuring Activity [Roll Forward]
Ending balance	$ 334
Multifamily | Non-performing loan aging
Restructured loans
Number of Loans | loan	1	1
Pre-Modification Recorded Investment	$ 334	$ 158
Post-Modification Recorded Investment	334	158
Charge-offs and Specific Reserves	0	$ 40
Office
Troubled Debt Restructuring Activity [Roll Forward]
Ending balance	$ 815
Office | Non-performing loan aging
Restructured loans
Number of Loans | loan	1
Pre-Modification Recorded Investment	$ 815
Post-Modification Recorded Investment	815
Charge-offs and Specific Reserves	191
Residential real estate
Troubled Debt Restructuring Activity [Roll Forward]
Ending balance	$ 140
Residential real estate | Performing
Restructured loans
Number of Loans | loan		3
Pre-Modification Recorded Investment		$ 588
Post-Modification Recorded Investment		588
Charge-offs and Specific Reserves		$ 0
Residential real estate | Non-performing loan aging
Restructured loans
Number of Loans | loan	1	6
Pre-Modification Recorded Investment	$ 140	$ 1,850
Post-Modification Recorded Investment	140	1,850
Charge-offs and Specific Reserves	17	$ 246
Indirect vehicle
Troubled Debt Restructuring Activity [Roll Forward]
Ending balance	$ 88
Indirect vehicle | Performing
Restructured loans
Number of Loans | loan		2
Pre-Modification Recorded Investment		$ 26
Post-Modification Recorded Investment		26
Charge-offs and Specific Reserves		$ 0
Indirect vehicle | Non-performing loan aging
Restructured loans
Number of Loans | loan	16	53
Pre-Modification Recorded Investment	$ 88	$ 320
Post-Modification Recorded Investment	88	320
Charge-offs and Specific Reserves	32	$ 88
Home equity
Troubled Debt Restructuring Activity [Roll Forward]
Ending balance	$ 7,768
Home equity | Performing
Restructured loans
Number of Loans | loan	17	9
Pre-Modification Recorded Investment	$ 4,809	$ 2,251
Post-Modification Recorded Investment	4,809	2,251
Charge-offs and Specific Reserves	$ 0	$ 0
Home equity | Non-performing loan aging
Restructured loans
Number of Loans | loan	17	27
Pre-Modification Recorded Investment	$ 2,959	$ 3,813
Post-Modification Recorded Investment	2,959	3,813
Charge-offs and Specific Reserves	$ 306	$ 335

Loans (Details 8)

Loans (Details 8) $ in Thousands	Dec. 31, 2015USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]
Extended Maturity, Amortization and Reduction of Interest Rate	$ 4,251
Extended Maturity and/or Amortization	1,161
Extended Maturity	1,229
Delay in Payments or Reduction of Interest Rate	13,992
Total	20,633
Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Extended Maturity, Amortization and Reduction of Interest Rate	0
Extended Maturity and/or Amortization	0
Extended Maturity	0
Delay in Payments or Reduction of Interest Rate	11,074
Total	11,074
Industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Extended Maturity, Amortization and Reduction of Interest Rate	0
Extended Maturity and/or Amortization	0
Extended Maturity	414
Delay in Payments or Reduction of Interest Rate	0
Total	414
Multifamily
Financing Receivable, Allowance for Credit Losses [Line Items]
Extended Maturity, Amortization and Reduction of Interest Rate	0
Extended Maturity and/or Amortization	334
Extended Maturity	0
Delay in Payments or Reduction of Interest Rate	0
Total	334
Office
Financing Receivable, Allowance for Credit Losses [Line Items]
Extended Maturity, Amortization and Reduction of Interest Rate	0
Extended Maturity and/or Amortization	0
Extended Maturity	815
Delay in Payments or Reduction of Interest Rate	0
Total	815
Residential real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Extended Maturity, Amortization and Reduction of Interest Rate	140
Extended Maturity and/or Amortization	0
Extended Maturity	0
Delay in Payments or Reduction of Interest Rate	0
Total	140
Indirect vehicle
Financing Receivable, Allowance for Credit Losses [Line Items]
Extended Maturity, Amortization and Reduction of Interest Rate	0
Extended Maturity and/or Amortization	0
Extended Maturity	0
Delay in Payments or Reduction of Interest Rate	88
Total	88
Home equity
Financing Receivable, Allowance for Credit Losses [Line Items]
Extended Maturity, Amortization and Reduction of Interest Rate	4,111
Extended Maturity and/or Amortization	827
Extended Maturity	0
Delay in Payments or Reduction of Interest Rate	2,830
Total	$ 7,768

Loans (Details 9)

Loans (Details 9) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	$ 114,057	$ 113,462	$ 128,279
Allowance for unfunded credit commitments acquired through business combination	0	1,261	0
Utilization of allowance for unfunded credit commitments	0	(637)	0
Provision for credit losses	21,386	12,052	(5,804)
Total charge-offs	17,211	24,745	23,675
Total recoveries	13,276	12,664	14,662
Net charge-offs (recoveries)	3,935	12,081	9,013
Allowance for credit losses	131,508	114,057	113,462
Allowance for unfunded credit commitments	(3,368)	(4,031)	(1,716)
Balance at December 31,	128,140	110,026	111,746
Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	2,993	1,339	3,706
Recoveries	1,749	3,757	3,156
Balance at December 31,	39,316	29,571	23,461
Commercial collateralized by assignment of lease payments
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	2,765	925	0
Recoveries	1,112	939	1,131
Balance at December 31,	10,434	9,962	9,159
Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	3,563	11,438	7,517
Recoveries	6,723	4,020	6,025
Balance at December 31,	45,475	41,826	51,628
Residential real estate
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	1,450	1,718	2,796
Recoveries	515	1,190	479
Balance at December 31,	5,734	6,646	8,872
Construction real estate
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	34	79	980
Recoveries	272	252	1,616
Balance at December 31,	15,113	8,918	6,856
Indirect vehicle
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	2,980	3,735	2,911
Recoveries	1,853	1,736	1,411
Balance at December 31,	2,418	1,687	1,662
Home equity
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	1,485	3,383	3,692
Recoveries	579	482	594
Balance at December 31,	7,374	9,456	8,478
Other consumer
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	1,941	2,128	2,073
Recoveries	473	288	250
Balance at December 31,	$ 2,276	$ 1,960	$ 1,630

Loans (Details 10)

Loans (Details 10) $ in Thousands		12 Months Ended
		Dec. 31, 2015USD ($)Pools_of_purchased_loans	Dec. 31, 2014USD ($)Pools_of_purchased_loans	Dec. 31, 2013USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Allowance for credit losses:
Beginning balance		$ 110,026	$ 111,746
Ending balance		128,140	110,026	$ 111,746
Ending allowance balance attributable to loans:
Acquired and accounted for under ASC 310-30	[1]				$ 2,077	$ 1,283
Total ending allowance balance		110,026	111,746	111,746	128,140	110,026
Loans:
Individually evaluated for impairment					114,465	101,532
Collectively evaluated for impairment					9,538,127	8,730,040
Acquired and accounted for under ASC 310-30	[1]				141,406	251,645
Total loans					9,793,998	9,083,217
Unfunded Commitments:
Beginning balance		4,031	1,716
Allowance for unfunded credit commitments acquired through business combination			1,261
Utilization of allowance for unfunded credit commitments			(637)
Provision		(663)	1,691
Ending balance		3,368	4,031	1,716
Unfunded commitments ending allowance balance:
Individually evaluated for impairment for unfunded commitments					1,392	1,348
Unfunded commitments collectively evaluated for impairment					1,976	2,683
Total ending allowance balance		4,031	1,716	1,716	3,368	4,031
Allowance for credit losses
Balance at beginning of year		114,057	113,462	128,279
Allowance for credit losses, Allowance for unfunded credit commitments acquired through business combination		0	1,261	0
Allowance for credit losses, Utilization of allowance for unfunded credit commitments		0	(637)	0
Allowance for credit losses, Charge-offs		17,211	24,745	23,675
Allowance for credit losses, Recoveries		13,276	12,664	14,662
Allowance for credit losses, Provision		21,386	12,052
Allowance for credit losses		131,508	114,057	113,462
Allowance for credit losses ending allowance balance:
Allowance for credit losses, individually evaluated for impairment					23,329	11,830
Allowance for credit losses, collectively evaluated for impairment					106,102	100,944
Acquired and accounted for under ASC 310-30	[1]				2,077	1,283
Total ending allowance balance		114,057	113,462	128,279	131,508	114,057
Net charge-offs (recoveries)		3,935	12,081	9,013
Commercial
Allowance for credit losses:
Beginning balance		29,571	23,461
Charge-offs		2,993	1,339	3,706
Recoveries		1,749	3,757	3,156
Provision		10,989	3,692
Ending balance		39,316	29,571	23,461
Ending allowance balance attributable to loans:
Individually evaluated for impairment					7,523	2,395
Collectively evaluated for impairment					31,228	26,684
Acquired and accounted for under ASC 310-30	[1]				565	492
Total ending allowance balance		29,571	23,461	23,461	39,316	29,571
Loans:
Individually evaluated for impairment					34,647	16,979
Collectively evaluated for impairment					3,581,639	3,228,227
Acquired and accounted for under ASC 310-30	[1]				24,284	103,582
Total loans					3,640,570	3,348,788
Allowance for credit losses ending allowance balance:
Acquired and accounted for under ASC 310-30	[1]				565	492
Commercial collateralized by assignment of lease payments
Allowance for credit losses:
Beginning balance		9,962	9,159
Charge-offs		2,765	925	0
Recoveries		1,112	939	1,131
Provision		2,125	789
Ending balance		10,434	9,962	9,159
Ending allowance balance attributable to loans:
Individually evaluated for impairment					1,790	105
Collectively evaluated for impairment					8,644	9,857
Total ending allowance balance		9,962	9,159	9,159	10,434	9,962
Loans:
Individually evaluated for impairment					6,246	3,031
Collectively evaluated for impairment					1,772,826	1,689,227
Total loans					1,779,072	1,692,258
Commercial real estate
Allowance for credit losses:
Beginning balance		41,826	51,628
Charge-offs		3,563	11,438	7,517
Recoveries		6,723	4,020	6,025
Provision		489	(2,384)
Ending balance		45,475	41,826	51,628
Ending allowance balance attributable to loans:
Individually evaluated for impairment					6,859	2,527
Collectively evaluated for impairment					37,198	38,517
Acquired and accounted for under ASC 310-30	[1]				1,418	782
Total ending allowance balance		41,826	51,628	51,628	45,475	41,826
Loans:
Individually evaluated for impairment					30,204	38,501
Collectively evaluated for impairment					2,665,472	2,506,366
Acquired and accounted for under ASC 310-30	[1]				36,362	80,378
Total loans					2,732,038	2,625,245
Allowance for credit losses ending allowance balance:
Acquired and accounted for under ASC 310-30	[1]				1,418	782
Allowance for loan losses and unfunded commitments acquired with deteriorated credit quality					2,100	1,300
Residential real estate
Allowance for credit losses:
Beginning balance		6,646	8,872
Charge-offs		1,450	1,718	2,796
Recoveries		515	1,190	479
Provision		23	(1,698)
Ending balance		5,734	6,646	8,872
Ending allowance balance attributable to loans:
Individually evaluated for impairment					2,634	3,126
Collectively evaluated for impairment					3,100	3,520
Total ending allowance balance		6,646	8,872	8,872	5,734	6,646
Loans:
Individually evaluated for impairment					13,739	16,175
Collectively evaluated for impairment					614,430	487,112
Acquired and accounted for under ASC 310-30	[1]				53,156	14,138
Total loans					681,325	517,425
Construction real estate
Allowance for credit losses:
Beginning balance		8,918	6,856
Charge-offs		34	79	980
Recoveries		272	252	1,616
Provision		5,957	1,889
Ending balance		15,113	8,918	6,856
Ending allowance balance attributable to loans:
Individually evaluated for impairment					0	162
Collectively evaluated for impairment					15,019	8,747
Acquired and accounted for under ASC 310-30	[1]				94	9
Total ending allowance balance		8,918	6,856	6,856	15,113	8,918
Loans:
Individually evaluated for impairment					0	337
Collectively evaluated for impairment					252,060	246,731
Acquired and accounted for under ASC 310-30	[1]				10,891	31,068
Total loans					262,951	278,136
Allowance for credit losses ending allowance balance:
Acquired and accounted for under ASC 310-30	[1]				94	9
Indirect vehicle
Allowance for credit losses:
Beginning balance		1,687	1,662
Charge-offs		2,980	3,735	2,911
Recoveries		1,853	1,736	1,411
Provision		1,858	2,024
Ending balance		2,418	1,687	1,662
Ending allowance balance attributable to loans:
Individually evaluated for impairment						14
Collectively evaluated for impairment					2,418	1,673
Total ending allowance balance		1,687	1,662	1,662	2,418	1,687
Loans:
Individually evaluated for impairment					119	227
Collectively evaluated for impairment					383,976	268,613
Total loans					384,095	268,840
Home equity
Allowance for credit losses:
Beginning balance		9,456	8,478
Charge-offs		1,485	3,383	3,692
Recoveries		579	482	594
Provision		(1,176)	3,879
Ending balance		7,374	9,456	8,478
Ending allowance balance attributable to loans:
Individually evaluated for impairment					3,131	2,153
Collectively evaluated for impairment					4,243	7,303
Total ending allowance balance		9,456	8,478	8,478	7,374	9,456
Loans:
Individually evaluated for impairment					29,510	26,282
Collectively evaluated for impairment					187,063	225,627
Acquired and accounted for under ASC 310-30	[1]				14,004	138
Total loans					230,577	252,047
Other consumer
Allowance for credit losses:
Beginning balance		1,960	1,630
Charge-offs		1,941	2,128	2,073
Recoveries		473	288	250
Provision		1,784	2,170
Ending balance		2,276	1,960	1,630
Ending allowance balance attributable to loans:
Collectively evaluated for impairment					2,276	1,960
Total ending allowance balance		1,960	1,630	$ 1,630	2,276	1,960
Loans:
Individually evaluated for impairment					0	0
Collectively evaluated for impairment					80,661	78,137
Acquired and accounted for under ASC 310-30	[1]				2,709	22,341
Total loans					83,370	100,478
Purchased credit-impaired loans
Allowance for credit losses:
Provision		$ (2,000)	$ 1,300
Loans:
Total loans					$ 37,200	$ 71,700
Allowance for credit losses ending allowance balance:
Provision and charge-offs related to the number of pools | Pools_of_purchased_loans		17	16
Net charge-offs (recoveries)		$ (2,800)	$ (323)
[1]	Loans acquired in business combinations and accounted for under ASC Subtopic 310-30 “Receivables — Loans and Debt Securities Acquired with Deteriorated Credit Quality.”

Loans (Details 11)

Loans (Details 11) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Changes in the accretable yield for purchased credit-impaired loans
Balance at beginning of period		$ 7,434	$ 2,337
Purchases		0	5,626
Accretion		(9,637)	(2,098)
Other (1)	[1]	14,799	1,569
Balance at end of period		$ 12,596	$ 7,434
[1]	Primarily includes discount transfers from non-accretable discount to accretable discount due to better than expected performance of loan pools acquired and accounted for under ASC 310-30.

Loans (Details 12)

Loans (Details 12) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non covered loans	$ 1,787,981
Total acquired	1,807,151
Outstanding balances on purchased loans from the FDIC	56,400	$ 95,100
Carrying amount on loans purchased from the FDIC	53,900	$ 91,400
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non covered loans	732,750
Commercial collateralized by assignment of lease payments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non covered loans	91,651
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non covered loans	694,830
Construction real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non covered loans	24,033
Consumer related
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased credit impaired and covered loans	19,170
Non covered loans	244,717
Purchased Credit-Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non covered loans	122,236
Total acquired	141,406
Purchased Credit-Impaired Loans | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non covered loans	24,284
Purchased Credit-Impaired Loans | Commercial collateralized by assignment of lease payments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non covered loans	0
Purchased Credit-Impaired Loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non covered loans	36,362
Purchased Credit-Impaired Loans | Construction real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non covered loans	10,891
Purchased Credit-Impaired Loans | Consumer related
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased credit impaired and covered loans	19,170
Non covered loans	50,699
Purchased Non-Credit-Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non covered loans	1,665,745
Total acquired	1,665,745
Purchased Non-Credit-Impaired Loans | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non covered loans	708,466
Purchased Non-Credit-Impaired Loans | Commercial collateralized by assignment of lease payments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non covered loans	91,651
Purchased Non-Credit-Impaired Loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non covered loans	658,468
Purchased Non-Credit-Impaired Loans | Construction real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non covered loans	13,142
Purchased Non-Credit-Impaired Loans | Consumer related
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased credit impaired and covered loans	0
Non covered loans	194,018
Heritage | Commercial Loans, Commercial Real Estate Receivable And Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Not Covered Under the Loss Share Agreement	2,000
Benchmark | Commercial Loans, Commercial Real Estate Receivable And Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Not Covered Under the Loss Share Agreement	1,800
Broadway and New Century | Commercial Loans, Commercial Real Estate Receivable And Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Not Covered Under the Loss Share Agreement	$ 14,800

Lease Investments (Details)

Lease Investments (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Direct finance leases:
Minimum lease payments		$ 392,901	$ 340,602
Estimated unguaranteed residual values		74,411	70,469
Less: unearned income		(34,675)	(31,229)
Direct finance leases	[1]	432,637	379,842
Leveraged leases:
Minimum lease payments		3,286	10,689
Estimated unguaranteed residual values		523	1,586
Less: unearned income		(126)	(540)
Less: related non-recourse debt		(3,199)	(10,330)
Leveraged leases	[1]	484	1,405
Operating leases:
Equipment, at cost		318,843	257,495
Less accumulated depreciation		(107,156)	(94,662)
Lease investments, net		$ 211,687	162,833
Minimum percentage of residual component in total equipment investment		10.00%
Loans at other banks for lease equipment purchases		$ 55,000	$ 38,500
[1]	Direct finance and leveraged leases are included as commercial loans collateralized by assignment of lease payments for financial statement purposes.

Lease Investments (Details 2)

Lease Investments (Details 2) $ in Thousands	Dec. 31, 2015USD ($)
Direct Finance Leases
2,016	$ 146,150
2,017	110,435
2,018	70,320
2,019	38,575
2,020	11,905
Thereafter	15,516
Total	392,901
Leveraged Leases
2,016	2,465
2,017	642
2,018	179
2,019	0
2,020	0
Thereafter	0
Total	3,286
Operating Leases
2,016	46,503
2,017	35,685
2,018	24,194
2,019	15,129
2,020	9,491
Thereafter	6,983
Total	137,985
Total
2,016	195,118
2,017	146,762
2,018	94,693
2,019	53,704
2,020	21,396
Thereafter	22,499
Total	$ 534,172

Lease Investments (Details 3)

Lease Investments (Details 3) $ in Thousands	Dec. 31, 2015USD ($)
Operating leases rent expense net
2,016	$ 21,081
2,017	29,734
2,018	27,792
2,019	21,946
2,020	21,262
Thereafter	23,345
Total	145,160
Direct Finance Leases
Operating leases rent expense net
2,016	7,178
2,017	20,158
2,018	16,435
2,019	14,196
2,020	10,499
Thereafter	5,945
Total	74,411
Leveraged Leases
Operating leases rent expense net
2,016	400
2,017	104
2,018	19
2,019	0
2,020	0
Thereafter	0
Total	523
Operating Leases
Operating leases rent expense net
2,016	13,503
2,017	9,472
2,018	11,338
2,019	7,750
2,020	10,763
Thereafter	17,400
Total	$ 70,226

Lease Investments (Details 4)

Lease Investments (Details 4) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)lease	Dec. 31, 2014USD ($)lease	Dec. 31, 2013USD ($)
Leases [Abstract]
Limit on individual lease equipment residual value per transaction	$ 1,000
Number of leases | lease	4,369	3,793
Average residual value per lease	$ 33	$ 34
Average residual value per master lease	132	155
Income from Lease Financing:
Rental income	69,363	64,017	$ 62,629
Equipment maintenance contracts revenue, net of cost of sales	23,027	16,441	11,071
Vendor promotional income	8,527	8,382	7,587
Other lease related revenue	5,038	2,121	1,796
Gain on sale of lease payments and leased equipment, net of residual write downs	8,042	12,899	12,002
Income on lease investments, gross	113,997	103,860	95,085
Less: depreciation on operating leases	(37,416)	(39,550)	(33,842)
Lease financing, net	$ 76,581	$ 64,310	$ 61,243

Premises and Equipment (Details

Premises and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Premises and Equipment
Premises and equipment, gross	$ 368,161	$ 352,358
Accumulated depreciation	(132,148)	(113,981)
Premises and equipment, net	236,013	238,377
Depreciation of premises and equipment and leased equipment	22,100	20,400	$ 18,100
Land and land improvements
Premises and Equipment
Premises and equipment, gross	67,089	67,630
Buildings
Premises and Equipment
Premises and equipment, gross	100,041	100,505
Furniture and equipment
Premises and Equipment
Premises and equipment, gross	139,648	124,490
Buildings and leasehold improvements
Premises and Equipment
Premises and equipment, gross	$ 61,383	$ 59,733

Goodwill and Intangibles (Detai

Goodwill and Intangibles (Details)	12 Months Ended
	Dec. 31, 2015USD ($)reporting_unit	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Number of operating segments | reporting_unit	3
Goodwill impairment loss	$ 0	$ 0	$ 0
Goodwill [Roll Forward]
Balance at beginning of period	711,521,000	711,521,000
Goodwill acquired during the period	13,500,000	0
Balance at end of period	$ 725,070,000	711,521,000	711,521,000
Weighted average amortization period (in years)	6 years
Other intangibles from business combinations	$ 12,921,000	20,079,000
Net book value	44,812,000	38,006,000	23,428,000
MSA
Goodwill [Roll Forward]
Goodwill acquired during the period	13,500,000
MSA | Core Deposits
Goodwill [Roll Forward]
Other intangibles from business combinations	12,921,000
Banking
Goodwill [Roll Forward]
Balance at beginning of period	670,900,000	670,900,000
Goodwill acquired during the period	13,500,000
Balance at end of period	684,400,000	670,900,000	670,900,000
Leasing
Goodwill [Roll Forward]
Balance at beginning of period	40,600,000	40,600,000
Balance at end of period	40,600,000	40,600,000	40,600,000
Mortgage Banking
Goodwill [Roll Forward]
Balance at beginning of period	0	0
Balance at end of period	$ 0	$ 0	$ 0

Goodwill and Intangibles (Det83

Goodwill and Intangibles (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Finite-lived Intangible Assets [Roll Forward]
Balance at beginning of period	$ 38,006	$ 23,428
Amortization expense	(6,115)	(5,501)	$ (6,084)
Other intangibles from business combinations	12,921	20,079
Gross carrying amount	93,292	80,371
Accumulated amortization	(48,480)	(42,365)
Balance at end of period	$ 44,812	$ 38,006	$ 23,428

Goodwill and Intangibles (Det84

Goodwill and Intangibles (Details 3) $ in Thousands	Dec. 31, 2015USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2,016	$ 6,407
2,017	5,738
2,018	5,242
2,019	3,685
2,020	3,232
Thereafter	20,508
Finite-Lived Intangible Assets, Net	$ 44,812

Deposits (Details)

Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Banking and Thrift [Abstract]
Demand deposit accounts, noninterest bearing	$ 4,627,184	$ 4,118,256
NOW and money market accounts	4,144,633	3,913,765
Savings accounts	974,555	940,345
Certificates of deposit, $250,000 or more	877,352	838,928
Other certificates of deposit	881,491	1,179,648
Total deposits	11,505,215	10,990,942
Brokered deposits	$ 500,200	$ 485,300

Deposits (Details 2)

Deposits (Details 2) $ in Thousands	Dec. 31, 2015USD ($)
Banking and Thrift [Abstract]
2,016	$ 1,130,389
2,017	282,486
2,018	199,572
2,019	48,110
2,020	82,941
Thereafter	15,345
Total	$ 1,758,843

Short-Term Borrowings (Details)

Short-Term Borrowings (Details) - USD ($)	Dec. 18, 2015	Dec. 31, 2015	Dec. 31, 2014
Short-term borrowings
Weighted Average Cost		0.23%	0.15%
Amount		$ 1,005,737,000	$ 931,415,000
Fixed interest rate Federal Home Loan Bank advances		$ 775,000,000	$ 700,000,000
Customer repurchase agreements
Short-term borrowings
Weighted Average Cost		0.20%	0.21%
Amount		$ 201,207,000	$ 219,824,000
Federal Home Loan Bank advances
Short-term borrowings
Weighted Average Cost		0.17%	0.13%
Amount		$ 775,000,000	$ 700,000,000
Federal funds purchased
Short-term borrowings
Weighted Average Cost		0.09%	0.14%
Amount		$ 4,530,000	$ 11,591,000
Line of credit
Short-term borrowings
Weighted Average Cost		2.18%
Amount		$ 25,000,000
Unsecured line of credit	$ 35,000,000
Description of interest rate basis	one month LIBOR
Line of credit | LIBOR
Short-term borrowings
Interest rate, basis spread (as a percent)	1.75%
Minimum
Short-term borrowings
Effective interest rate for fixed rate advance (as a percent)		0.16%
Maximum
Short-term borrowings
Effective interest rate for fixed rate advance (as a percent)		0.19%

Long-term Borrowings (Details)

Long-term Borrowings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Long-term borrowings
Long-term borrowings	$ 400,274	$ 82,916
Federal Home Loan Bank advances	$ 305,200	4,200
Effective interest rates on Federal Home Loan Bank advances, low end of range (as a percent)	0.38%
Effective interest rates on Federal Home Loan Bank advances, high end of range (as a percent)	5.87%
Notes payable to banks
Long-term borrowings
Long-term borrowings	$ 55,000	38,500
Minimum interest rates (as a percent)	2.25%
Maximum interest rates (as a percent)	12.00%
Equipment pledged as collateral	$ 65,800	48,800
Structured repurchase agreement
Long-term borrowings
Long-term borrowings	$ 40,000	$ 40,000
Term of structured repurchase agreement (in years)	10 years	10 years
Fixed interest rate, if option not exercised (as a percent)	4.75%	4.75%

Long-term Borrowings (Details 2

Long-term Borrowings (Details 2) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Debt Disclosure [Abstract]
2,016	$ 65,374
2,017	317,066
2,018	8,539
2,019	3,549
2,020	1,373
Thereafter	4,373
Long-term borrowings	$ 400,274	$ 82,916

Junior Subordinated Notes Iss90

Junior Subordinated Notes Issued to Capital Trusts (Details) - USD ($) $ in Thousands		Sep. 22, 2014	Sep. 30, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Outstanding junior subordinated notes
Principal balance				$ 186,164	$ 185,778
Liquidation amount of trust preferred securities				22,232	13,059	$ 61,616
Gain on extinguishment of debt				$ 0	$ 1,895	$ 0
Junior Subordinated Notes | Maximum
Outstanding junior subordinated notes
Period for deferment of payment of interest on notes (in years)				5 years
Coal City Capital Trust I | Junior Subordinated Notes
Outstanding junior subordinated notes
Principal balance				$ 25,774
Interest rate, basis spread (as a percent)				1.80%
Description of annual interest rate basis				3-mo LIBOR
MB Financial Capital Trust II | Junior Subordinated Notes
Outstanding junior subordinated notes
Principal balance				$ 36,083
Interest rate, basis spread (as a percent)				1.40%
Description of annual interest rate basis				3-mo LIBOR
MB Financial Capital Trust III | Junior Subordinated Notes
Outstanding junior subordinated notes
Principal balance				$ 10,310
Interest rate, basis spread (as a percent)				1.50%
Description of annual interest rate basis				3-mo LIBOR
MB Financial Capital Trust IV | Junior Subordinated Notes
Outstanding junior subordinated notes
Principal balance				$ 20,619
Interest rate, basis spread (as a percent)				1.52%
Description of annual interest rate basis				3-mo LIBOR
MB Financial Capital Trust V | Junior Subordinated Notes
Outstanding junior subordinated notes
Principal balance				$ 30,928
Interest rate, basis spread (as a percent)				1.30%
Description of annual interest rate basis				3-mo LIBOR
MB Financial Capital Trust VI | Junior Subordinated Notes
Outstanding junior subordinated notes
Principal balance				$ 23,196
Interest rate, basis spread (as a percent)				1.30%
Description of annual interest rate basis				3-mo LIBOR
FOBB Statutory Trust III | Junior Subordinated Notes
Outstanding junior subordinated notes
Principal balance	[1]			$ 5,155
Interest rate, basis spread (as a percent)	[1]			2.80%
Description of annual interest rate basis	[1]			3-mo LIBOR
TAYC Capital Trust II | Junior Subordinated Notes
Outstanding junior subordinated notes
Principal balance	[2]			$ 41,238
Interest rate, basis spread (as a percent)	[2]			2.68%
Description of annual interest rate basis	[2]			3-mo LIBOR
Taylor Capital Trust I | Junior Subordinated Notes
Outstanding junior subordinated notes
Stated interest rate		9.75%
Liquidation amount of trust preferred securities		$ 45,400
Gain on extinguishment of debt			$ 1,900
[1]	FOBB Statutory Trust III was established by First Oak Brook Bancshares, Inc. (“FOBB”) prior to the Company's acquisition of FOBB in 2006, and the junior subordinated notes issued by FOBB to FOBB Statutory Trust III were assumed by the Company upon completion of the acquisition.
[2]	TAYC Capital Trust II was established by Taylor Capital prior to the Company's acquisition of Taylor Capital in 2014, and the junior subordinated notes issued by Taylor Capital to TAYC Capital Trust II were assumed by the Company upon completion of the acquisition. Principal balance and face value amounts associated with TAYC Capital Trust II do not include acquisition accounting adjustments to such amounts, which in each case resulted in a discount. This discount was $7.1 million as of December 31, 2015.

Junior Subordinated Notes Iss91

Junior Subordinated Notes Issued to Capital Trusts (Details 2) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)
Coal City Capital Trust I | Trust preferred securities issued by each trust
Trust preferred securities issued by each trust
Face Value	$ 25,000
Interest rate, basis spread (as a percent)	1.80%
Description of annual interest rate basis	3-mo LIBOR
MB Financial Capital Trust II | Trust preferred securities issued by each trust
Trust preferred securities issued by each trust
Face Value	$ 35,000
Interest rate, basis spread (as a percent)	1.40%
Description of annual interest rate basis	3-mo LIBOR
MB Financial Capital Trust III | Trust preferred securities issued by each trust
Trust preferred securities issued by each trust
Face Value	$ 10,000
Interest rate, basis spread (as a percent)	1.50%
Description of annual interest rate basis	3-mo LIBOR
MB Financial Capital Trust IV | Trust preferred securities issued by each trust
Trust preferred securities issued by each trust
Face Value	$ 20,000
Interest rate, basis spread (as a percent)	1.52%
Description of annual interest rate basis	3-mo LIBOR
MB Financial Capital Trust V | Trust preferred securities issued by each trust
Trust preferred securities issued by each trust
Face Value	$ 30,000
Interest rate, basis spread (as a percent)	1.30%
Description of annual interest rate basis	3-mo LIBOR
MB Financial Capital Trust VI | Trust preferred securities issued by each trust
Trust preferred securities issued by each trust
Face Value	$ 22,500
Interest rate, basis spread (as a percent)	1.30%
Description of annual interest rate basis	3-mo LIBOR
FOBB Statutory Trust III | Trust preferred securities issued by each trust
Trust preferred securities issued by each trust
Face Value	$ 5,000	[1]
Interest rate, basis spread (as a percent)	2.80%	[1]
Description of annual interest rate basis	3-mo LIBOR	[1]
TAYC Capital Trust II
Trust preferred securities issued by each trust
Purchase accounting adjustments discount	$ 7,100
TAYC Capital Trust II | Trust preferred securities issued by each trust
Trust preferred securities issued by each trust
Face Value	$ 40,000	[2]
Interest rate, basis spread (as a percent)	2.68%	[2]
Description of annual interest rate basis	3-mo LIBOR	[2]
[1]	FOBB Statutory Trust III was established by First Oak Brook Bancshares, Inc. (“FOBB”) prior to the Company's acquisition of FOBB in 2006, and the junior subordinated notes issued by FOBB to FOBB Statutory Trust III were assumed by the Company upon completion of the acquisition.
[2]	TAYC Capital Trust II was established by Taylor Capital prior to the Company's acquisition of Taylor Capital in 2014, and the junior subordinated notes issued by Taylor Capital to TAYC Capital Trust II were assumed by the Company upon completion of the acquisition. Principal balance and face value amounts associated with TAYC Capital Trust II do not include acquisition accounting adjustments to such amounts, which in each case resulted in a discount. This discount was $7.1 million as of December 31, 2015.

Lease Commitments and Rental 92

Lease Commitments and Rental Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net Rents
Net rental expense	$ 8,900	$ 7,400	$ 4,700
Office space
Gross Rents
2,016	10,463
2,017	9,365
2,018	6,923
2,019	5,909
2,020	3,469
Thereafter	16,359
Total	52,488
Sublease Rents
2,016	577
2,017	504
2,018	462
2,019	397
2,020	397
Thereafter	166
Total	2,503
Net Rents
2,016	9,886
2,017	8,861
2,018	6,461
2,019	5,512
2,020	3,072
Thereafter	16,193
Total	$ 49,985

Employee Benefit Plans (Details

Employee Benefit Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]
Requisite service period to participate in contribution plan (in months)	3 months
Employee contribution limit per calendar year (as a percent of compensation)	75.00%
Employer contribution limit per calendar year (as a percent of compensation)	3.50%
Company's expected contribution to plan during current fiscal year	$ 14,200
Company's total contribution to plan		$ 7,400	$ 7,000
Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Defer payment, participant limit per calendar year (as a percent of compensation)	100.00%
Estimated discretionary company contributions	$ 869
Actual employer's contribution		$ 512	$ 520
Chief executive officer | Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Employer's contribution to deferred compensation plan (as a percent of base salary)	20.00%
Fair market value of assets held in other publicly traded funds	$ 16,800
Decreases in fair market value of assets and obligation	$ 6

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax asset:
Allowance for credit losses	$ 51,256	$ 43,853
Federal net operating loss carryforwards	0	12,234
State net operating loss carryforwards	22,624	26,582
Other real estate owned	11,165	14,229
Stock options and restricted stock	7,317	5,904
Loans	36,386	47,668
Deferred compensation	8,550	10,620
Tax credit carryforwards	27,904	25,244
Bonus accrual	3,827	5,595
Other items	1,008	3,390
Total deferred tax asset	170,037	195,319
Valuation allowance	0	0
Total deferred tax asset, net of valuation allowance	170,037	195,319
Deferred tax liability:
Equipment leasing	(132,159)	(112,524)
Premises and equipment	(21,371)	(18,817)
Mortgage servicing rights	(59,369)	(64,486)
Deferred income from FDIC-assisted transactions	(43,102)	(45,999)
Investment securities	(2,317)	(1,802)
FHLB stock dividends	(3,207)	(2,652)
Core deposit intangible	(7,448)	(9,118)
Other items	(3,509)	(2,794)
Total deferred tax liability	(272,482)	(258,192)
Net deferred tax liability	(102,445)	(62,873)
Net unrealized holding gain on investment securities available for sale	(10,137)	(13,099)
Net deferred tax liability	$ (112,582)	$ (75,972)

Income Taxes (Details 2)

Income Taxes (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current expense (benefit):
Federal	$ 30,283	$ 25,270	$ 12,234
State	3,355	11,971	5,576
Foreign	0	0	0
Current expense (benefit)	33,638	37,241	17,810
Deferred expense (benefit):
Federal	28,765	3,122	17,245
State	10,808	(3,170)	4,436
Foreign	0	0	0
Deferred income tax expense	39,573	(48)	21,681
Income tax expense	$ 73,211	$ 37,193	$ 39,491
Statutory federal income tax rate (as a percent)	35.00%	35.00%	35.00%
Federal Alternative Minimum Tax Credit Carryforward
Operating loss carryforwards
Tax credit carryforward	$ 23,400
General Business Tax Credit Carryforward
Operating loss carryforwards
Tax credit carryforward	4,400
State
Operating loss carryforwards
Net operating loss carryforwards	8,500
ILLINOIS | State
Operating loss carryforwards
Net operating loss carryforwards	$ 441,000

Income Taxes (Details 3)

Income Taxes (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Federal income tax expense at expected statutory rate	$ 81,256	$ 43,153	$ 48,281
Increase (decrease) due to:
Tax exempt income, net	(16,909)	(14,848)	(14,200)
State tax expense net of federal impact	9,205	5,721	6,508
Non-deductible contingent consideration	158	3,738	0
Non-includable increase in cash surrender value of life insurance	(1,191)	(1,120)	(1,111)
Non-deductible merger expense	360	988	591
Adjustment of tax contingency reserves	(969)	(31)	(24)
Other items, net	1,301	(408)	(554)
Income tax expense	$ 73,211	$ 37,193	$ 39,491

Income Taxes (Details 4)

Income Taxes (Details 4) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)
Unrecognized Tax Benefit Without Interest
Balance at the beginning of the period	$ 981
Increases for tax positions of prior years	0
Decreases related to prior year tax positions	(927)
Decreases related to lapse of statute of limitations	(37)
Balance at the end of the period	17
Interest on unrecognized Tax Benefit
Balance at the beginning of the period	7
Increases for tax positions of prior years	1
Decreases related to prior year tax positions	0
Decreases related to lapse of statute of limitations	(6)
Balance at the end of the period	2
Total Unrecognized Tax Benefit Including Interest
Balance at the beginning of the period	988
Increases for tax positions of prior years	1
Decreases related to prior year tax positions	(927)
Decreases related to lapse of statute of limitations	(43)
Balance at the end of the period	$ 19

Commitments and Contingencies98

Commitments and Contingencies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Other Commitments [Abstract]
Increase in maximum potential amount of future payments under letters of credit	$ 4,800
Maximum maturity period for letters of credit (in years)	5 years
Dollar amount of letters of credit outstanding	$ 139,100	$ 134,200
Letters of credit issued or renewed	116,700
Capital expenditure commitments outstanding	6,200
Home equity lines
Long-term Purchase Commitment [Line Items]
Dollar amount of line of credit outstanding	187,478	221,102
Other commitments
Long-term Purchase Commitment [Line Items]
Dollar amount of line of credit outstanding	3,049,152	2,643,220
Standby
Long-term Purchase Commitment [Line Items]
Dollar amount of line of credit outstanding	137,945	131,810
Commercial
Long-term Purchase Commitment [Line Items]
Dollar amount of line of credit outstanding	$ 1,108	$ 2,401

Commitments and Contingencies99

Commitments and Contingencies (Details 2)	12 Months Ended
	Dec. 31, 2015
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	21.00%

Regulatory Matters (Details)

Regulatory Matters (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Total capital (to risk-weighted assets):
Actual Amount	$ 1,635,548	$ 1,544,759
Actual Ratio (as a percent)	12.54%	13.62%
For Capital Adequacy Purposes Amount	$ 1,043,025	$ 907,369
For Capital Adequacy Purposes Ratio (as a percent)	8.00%	8.00%
Tier 1 capital (to risk-weighted assets):
Actual Amount	$ 1,504,040	$ 1,430,702
Actual Ratio (as a percent)	11.54%	12.61%
For Capital Adequacy Purposes Amount	$ 782,269	$ 453,684
For Capital Adequacy Purposes Ratio (as a percent)	6.00%	4.00%
Tier 1 capital (to average assets):
Actual Amount	$ 1,504,040	$ 1,430,702
Actual Ratio (as a percent)	10.40%	10.47%
For Capital Adequacy Purposes Amount	$ 578,398	$ 546,766
For Capital Adequacy Purposes Ratio (as a percent)	4.00%	4.00%
MB Financial Bank
Total capital (to risk-weighted assets):
Actual Amount	$ 1,509,453	$ 1,473,928
Actual Ratio (as a percent)	11.62%	13.03%
For Capital Adequacy Purposes Amount	$ 1,039,129	$ 904,917
For Capital Adequacy Purposes Ratio (as a percent)	8.00%	8.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 1,298,911	$ 1,131,146
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	10.00%	10.00%
Tier 1 capital (to risk-weighted assets):
Actual Amount	$ 1,377,945	$ 1,359,871
Actual Ratio (as a percent)	10.61%	12.02%
For Capital Adequacy Purposes Amount	$ 779,347	$ 452,459
For Capital Adequacy Purposes Ratio (as a percent)	6.00%	4.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 1,039,129	$ 678,688
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	8.00%	6.00%
Tier 1 capital (to average assets):
Actual Amount	$ 1,377,945	$ 1,359,871
Actual Ratio (as a percent)	9.54%	9.96%
For Capital Adequacy Purposes Amount	$ 577,999	$ 545,943
For Capital Adequacy Purposes Ratio (as a percent)	4.00%	4.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 722,499	$ 682,429
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	5.00%	5.00%

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Financial assets
Securities available for sale, at fair value		$ 1,585,023	$ 1,654,752
Loans held for sale		744,727	737,209
Total loans, excluding purchased credit impaired loans		9,652,592	8,831,572
Mortgage servicing rights		168,162	235,402
Derivative financial instruments		10,062	13,952
Financial liabilities
Derivative financial instruments		34,338	37,927
U.S. Government sponsored agencies and enterprises
Financial assets
Securities available for sale, at fair value		64,611	65,873
States and political subdivisions
Financial assets
Securities available for sale, at fair value		396,367	410,854
Residential mortgage-backed securities
Financial assets
Securities available for sale, at fair value		763,549	720,563
Commercial mortgage-backed securities
Financial assets
Securities available for sale, at fair value		130,107	187,662
Corporate bonds
Financial assets
Securities available for sale, at fair value		219,628	259,203
Equity securities
Financial assets
Securities available for sale, at fair value		10,761	10,597
Recurring basis
Financial assets
Loans held for sale		744,727	737,209
Total loans, excluding purchased credit impaired loans		25,869
Mortgage servicing rights		168,162	235,402
Assets held in trust for deferred compensation		16,820	16,829
Derivative financial instruments		42,846	46,388
Financial liabilities
Other liabilities	[1]	16,333	16,483
Derivative financial instruments		36,974	40,499
Recurring basis | U.S. Government sponsored agencies and enterprises
Financial assets
Securities available for sale, at fair value		64,611	65,873
Recurring basis | States and political subdivisions
Financial assets
Securities available for sale, at fair value		396,367	410,854
Recurring basis | Residential mortgage-backed securities
Financial assets
Securities available for sale, at fair value		763,549	720,563
Recurring basis | Commercial mortgage-backed securities
Financial assets
Securities available for sale, at fair value		130,107	187,662
Recurring basis | Corporate bonds
Financial assets
Securities available for sale, at fair value		219,628	259,203
Recurring basis | Equity securities
Financial assets
Securities available for sale, at fair value		10,761	10,597
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets
Securities available for sale, at fair value		10,761	10,597
Loans held for sale		0	0
Assets held in trust for deferred compensation		16,820	16,829
Derivative financial instruments		5,118	1,607
Financial liabilities
Other liabilities	[1]	16,333	16,483
Derivative financial instruments		6,050	7,209
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities
Financial assets
Securities available for sale, at fair value		10,761	10,597
Recurring basis | Significant Other Observable Inputs (Level 2)
Financial assets
Securities available for sale, at fair value		1,573,489	1,643,182
Loans held for sale		744,727	737,209
Total loans, excluding purchased credit impaired loans		25,869
Derivative financial instruments		33,906	39,707
Financial liabilities
Derivative financial instruments		30,924	33,290
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. Government sponsored agencies and enterprises
Financial assets
Securities available for sale, at fair value		64,611	65,873
Recurring basis | Significant Other Observable Inputs (Level 2) | States and political subdivisions
Financial assets
Securities available for sale, at fair value		395,950	410,391
Recurring basis | Significant Other Observable Inputs (Level 2) | Residential mortgage-backed securities
Financial assets
Securities available for sale, at fair value		763,193	720,053
Recurring basis | Significant Other Observable Inputs (Level 2) | Commercial mortgage-backed securities
Financial assets
Securities available for sale, at fair value		130,107	187,662
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate bonds
Financial assets
Securities available for sale, at fair value		219,628	259,203
Recurring basis | Significant Unobservable Inputs (Level 3)
Financial assets
Securities available for sale, at fair value		773	973
Loans held for sale		0	0
Mortgage servicing rights		168,162	235,402
Derivative financial instruments		3,822	5,074
Financial liabilities
Derivative financial instruments		0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | States and political subdivisions
Financial assets
Securities available for sale, at fair value		417	463
Recurring basis | Significant Unobservable Inputs (Level 3) | Residential mortgage-backed securities
Financial assets
Securities available for sale, at fair value		$ 356	$ 510
[1]	Liabilities associated with assets held in trust for deferred compensation

Fair Value Measurements (Det102

Fair Value Measurements (Details 2) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and a Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	$ 1,585,023,000	$ 1,654,752,000
Mortgage servicing rights, at fair value	168,162,000	235,402,000
Derivative financial instruments	$ 10,062,000	13,952,000
Appraisal adjustments - sales costs (as a percent)	100.00%
States and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and a Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	$ 396,367,000	410,854,000
Residential mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and a Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	763,549,000	720,563,000
Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and a Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	219,628,000	259,203,000
Recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and a Nonrecurring Basis [Line Items]
Mortgage servicing rights, at fair value	168,162,000	235,402,000
Derivative financial instruments	42,846,000	46,388,000
Recurring basis | States and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and a Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	396,367,000	410,854,000
Recurring basis | Residential mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and a Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	763,549,000	720,563,000
Recurring basis | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and a Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	219,628,000	259,203,000
Significant Unobservable Inputs (Level 3) | Recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and a Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	773,000	973,000
Mortgage servicing rights, at fair value	168,162,000	235,402,000
Derivative financial instruments	3,822,000	5,074,000
Significant Unobservable Inputs (Level 3) | Recurring basis | States and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and a Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	$ 417,000	463,000
Credit assumption (as a percent)	45.00%
Significant Unobservable Inputs (Level 3) | Recurring basis | Residential mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and a Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	$ 356,000	$ 510,000
Significant Unobservable Inputs (Level 3) | Recurring basis | Minimum | Residential mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and a Nonrecurring Basis [Line Items]
Constant prepayment rates (as a percent)	1.00%
Significant Unobservable Inputs (Level 3) | Recurring basis | Minimum | Mortgage Servicing Rights
Fair Value, Assets and Liabilities Measured on Recurring and a Nonrecurring Basis [Line Items]
Weighted average prepayment speed (CPR)	8.80%
Weighted average discount rate	9.25%
Maturity period (in months)	327 months
Weighted average delinquency rate	0.51%
Weighted average costs to service	$ 61
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Delinquent Cost of Services	$ 150
Significant Unobservable Inputs (Level 3) | Recurring basis | Minimum | Mortgage Derivative Instruments
Fair Value, Assets and Liabilities Measured on Recurring and a Nonrecurring Basis [Line Items]
Expected closing ratio	60.00%
Expected delivery price	0.9818%
Significant Unobservable Inputs (Level 3) | Recurring basis | Maximum | Residential mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and a Nonrecurring Basis [Line Items]
Constant prepayment rates (as a percent)	3.00%
Significant Unobservable Inputs (Level 3) | Recurring basis | Maximum | Mortgage Servicing Rights
Fair Value, Assets and Liabilities Measured on Recurring and a Nonrecurring Basis [Line Items]
Weighted average prepayment speed (CPR)	13.60%
Weighted average discount rate	12.00%
Maturity period (in months)	357 months
Weighted average delinquency rate	3.81%
Weighted average costs to service	$ 160
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Delinquent Cost of Services	$ 1,000
Significant Unobservable Inputs (Level 3) | Recurring basis | Maximum | Mortgage Derivative Instruments
Fair Value, Assets and Liabilities Measured on Recurring and a Nonrecurring Basis [Line Items]
Expected closing ratio	95.00%
Expected delivery price	1.0837%

Fair Value Measurements (Det103

Fair Value Measurements (Details 3) - Mortgage Servicing Rights	12 Months Ended
	Dec. 31, 2015USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Impact on fair value of 10% adverse change	$ (6,668,000)
Impact on fair value of 20% adverse change	(12,836,000)
Impact on fair value of 10% adverse change	(5,997,000)
Impact on fair value of 20% adverse change	(11,590,000)
Impact on fair value of 10% adverse change	(1,158,000)
Impact on fair value of 20% adverse change	(2,341,000)
Impact on fair value of 10% adverse change	(2,990,000)
Impact on fair value of 20% adverse change	$ (5,979,000)
Weighted Average
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Weighted average prepayment speed (CPR)	11.50%
Weighted average discount rate	9.56%
Weighted average delinquency rate	1.82%
Weighted average costs to service	$ 83

Fair Value Measurements (Det104

Fair Value Measurements (Details 4) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Securities Investment
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at the beginning of the period	$ 973	$ 5,856
Acquired through business combination	0	507
Purchases	0	0
Originations	0	0
Other comprehensive income	0	128
Included in earnings	0	0
Principal payments	(200)	(363)
Impairment charge	0	(92)
Sales	0	(498)
Transferred out of level 3	0	(4,565)
Balance at the end of the period	773	973
Mortgage Servicing Rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at the beginning of the period	235,402	0
Acquired through business combination	0	224,798
Purchases	823	1,096
Originations	68,690	21,285
Other comprehensive income	0	0
Included in earnings	(33,648)	(11,777)
Principal payments	0	0
Impairment charge	0	0
Sales	(103,105)	0
Transferred out of level 3	0	0
Balance at the end of the period	168,162	235,402
Derivatives
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at the beginning of the period	5,074	0
Acquired through business combination	0	5,922
Purchases	0	0
Originations	0	0
Other comprehensive income	0	0
Included in earnings	(1,252)	(848)
Principal payments	0	0
Impairment charge	0	0
Sales	0	0
Transferred out of level 3	0	0
Balance at the end of the period	$ 3,822	$ 5,074

Fair Value Measurements (Det105

Fair Value Measurements (Details 5) - Nonrecurring basis - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Financial Assets:
Impaired loans	$ 76,203	$ 61,717
Foreclosed assets	42,351	38,619
Significant Unobservable Inputs (Level 3)
Financial Assets:
Impaired loans	76,203	61,717
Foreclosed assets	$ 42,351	$ 38,619
Significant Unobservable Inputs (Level 3) | Minimum
Financial Assets:
Appraisal adjustment, impaired loans	5.00%
Appraisal adjustment, foreclosed assets	5.00%
Significant Unobservable Inputs (Level 3) | Maximum
Financial Assets:
Appraisal adjustment, impaired loans	10.00%
Appraisal adjustment, foreclosed assets	10.00%

Fair Value Measurements (Det106

Fair Value Measurements (Details 6) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
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	$ 307,869	$ 256,804
Interest bearing deposits with banks	73,572	55,277
Securities available for sale, at fair value	1,585,023	1,654,752
Investment securities held to maturity	1,274,767	1,035,061
Non-marketable securities - FHLB and FRB stock	114,233	75,569
Loans held for sale	744,727	737,209
Derivative financial instruments	10,062	13,952
Financial Liabilities:
Non-interest bearing deposits	4,627,184	4,118,256
Interest bearing deposits	6,878,031	6,872,686
Short-term borrowings	1,005,737	931,415
Junior subordinated notes issued to capital trusts	186,164	185,778
Derivative financial instruments	34,338	37,927
Carrying Amount
Financial Assets:
Cash and due from banks	307,869	256,804
Interest bearing deposits with banks	73,572	55,277
Securities available for sale, at fair value	1,585,023	1,654,752
Investment securities held to maturity	1,230,810	993,380
Non-marketable securities - FHLB and FRB stock	114,233	75,569
Loans held for sale	744,727	737,209
Loans, net	9,665,858	8,973,191
Accrued interest receivable	53,457	49,065
Derivative financial instruments	42,846	46,388
Financial Liabilities:
Non-interest bearing deposits	4,627,184	4,118,256
Interest bearing deposits	6,878,031	6,872,686
Short-term borrowings	1,005,737	931,415
Long-term borrowings	400,274	82,916
Junior subordinated notes issued to capital trusts	186,164	185,778
Accrued interest payable	3,186	3,709
Derivative financial instruments	36,974	40,499
Total Fair Value
Financial Assets:
Cash and due from banks	307,869	256,804
Interest bearing deposits with banks	73,572	55,277
Securities available for sale, at fair value	1,585,023	1,654,752
Investment securities held to maturity	1,274,767	1,035,061
Non-marketable securities - FHLB and FRB stock	114,233	75,569
Loans held for sale	744,727	737,209
Loans, net	9,626,344	8,956,494
Accrued interest receivable	53,457	49,065
Derivative financial instruments	42,846	46,388
Financial Liabilities:
Non-interest bearing deposits	4,627,184	4,118,256
Interest bearing deposits	6,875,411	6,877,349
Short-term borrowings	1,005,705	931,416
Long-term borrowings	401,539	86,025
Junior subordinated notes issued to capital trusts	122,696	122,408
Accrued interest payable	3,186	3,709
Derivative financial instruments	36,974	40,499
Recurring basis
Financial Assets:
Loans held for sale	744,727	737,209
Derivative financial instruments	42,846	46,388
Financial Liabilities:
Derivative financial instruments	36,974	40,499
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial Assets:
Cash and due from banks	307,869	256,804
Interest bearing deposits with banks	73,572	55,277
Securities available for sale, at fair value	10,761	10,597
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	53,457	49,065
Derivative financial instruments	5,118	1,607
Financial Liabilities:
Non-interest bearing deposits	4,627,184	4,118,256
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	3,186	3,709
Derivative financial instruments	6,050	7,209
Recurring basis | Significant Other Observable Inputs (Level 2)
Financial Assets:
Cash and due from banks	0	0
Interest bearing deposits with banks	0	0
Securities available for sale, at fair value	1,573,489	1,643,182
Investment securities held to maturity	1,274,767	1,035,061
Non-marketable securities - FHLB and FRB stock	0	0
Loans held for sale	744,727	737,209
Loans, net	25,869	0
Accrued interest receivable	0	0
Derivative financial instruments	33,906	39,707
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	30,924	33,290
Recurring basis | Significant Unobservable Inputs (Level 3)
Financial Assets:
Cash and due from banks	0	0
Interest bearing deposits with banks	0	0
Securities available for sale, at fair value	773	973
Investment securities held to maturity	0	0
Non-marketable securities - FHLB and FRB stock	114,233	75,569
Loans held for sale	0	0
Loans, net	9,600,475	8,956,494
Accrued interest receivable	0	0
Derivative financial instruments	3,822	5,074
Financial Liabilities:
Non-interest bearing deposits	0	0
Interest bearing deposits	6,875,411	6,877,349
Short-term borrowings	1,005,705	931,416
Long-term borrowings	401,539	86,025
Junior subordinated notes issued to capital trusts	122,696	122,408
Accrued interest payable	0	0
Derivative financial instruments	$ 0	$ 0

Stock Incentive Plans (Details)

Stock Incentive Plans (Details) - USD ($) $ in Thousands	May. 28, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Aug. 18, 2014
Impact of the share-based payment plans in the financial statements
Total compensation expense for share-based payment plans during the year		$ 14,123	$ 8,974	$ 5,456
Amount of related income tax benefit recognized in income		$ 5,515	$ 3,528	$ 2,159
Stock-based compensation
Numerator of shares granted beyond threshold limit		2
Omnibus Incentive Plan (the "Omnibus Plan")
Stock-based compensation
Number of additional authorized shares	3,100,000
Number of common shares authorized for issuance	11,400,000
Percentage of shares authorized for issuance	10.00%
Minimum vesting period (in years)	3 years
Number of shares available for future grants		5,147,627
Unrecognized compensation cost		$ 19,700
Expected weighted-average period for recognition of unrecognized compensation expense (in years)		2 years 2 months
Stock options
Stock-based compensation
Continuous service period for vesting of option awards (in years)		4 years
Contractual terms of option awards (in years)		10 years
Stock options | Director
Stock-based compensation
Minimum vesting period (in years)		5 years
Maximum percentage of fees with an option to be received in equity-based incentive awards		70.00%
Period of restriction for sale of underlying shares (in months)		6 months
Restricted stock | Director
Stock-based compensation
Minimum vesting period (in years)		1 year
Maximum percentage of fees with an option to be received in equity-based incentive awards		100.00%
Performance-based restricted stock units
Stock-based compensation
Minimum vesting period (in years)		3 years
Number of shares issued		71,560	48,569	56,752	65,333
Performance based restricted units performance period (in years)		3 years
Share based compensation restricted stock units multiplier (in percent)		100.00%
Share-based Compensation Arrangement by Share-based Payment Award, Percent of Shares Earned Based On Shares Issued		148.00%
Minimum | Restricted stock and restricted stock units
Stock-based compensation
Minimum vesting period (in years)		2 years
Minimum | Performance-based restricted stock units
Stock-based compensation
Percentage of shares earned to number of units issued		0.00%
Maximum | Restricted stock and restricted stock units
Stock-based compensation
Minimum vesting period (in years)		4 years
Maximum | Performance-based restricted stock units
Stock-based compensation
Percentage of shares earned to number of units issued		175.00%
Taylor Capital Group, Inc. | Omnibus Incentive Plan (the "Omnibus Plan")
Stock-based compensation
Number of common shares authorized for issuance						13,800,000
Number of additional shares authorized	2,400,000

Stock Incentive Plans (Details

Stock Incentive Plans (Details 2) - Stock options - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Number of Options
Options outstanding at the beginning of the period (in shares)	2,250,714
Granted (in shares)	336,493
Exercised (in shares)	(156,754)
Expired or cancelled (in shares)	(207,674)
Forfeited (in shares)	(30,348)
Options outstanding at the end of the period (in shares)	2,192,431	2,250,714
Options exercisable at end of the period (in shares)	1,681,330
Weighted Average Exercise Price
Options outstanding at the beginning of the period (in dollars per share)	$ 27.94
Granted (in dollars per share)	31.49
Exercised (in dollars per share)	21.96
Expired or cancelled (in dollars per share)	39.81
Forfeited (in dollars per share)	28.90
Options outstanding at the end of the period (in dollars per share)	27.77	$ 27.94
Options exercisable at end of the period (in dollars per share)	$ 27.29
Weighted Average Remaining Contractual Term (in years)
Options outstanding at the end of the period	4 years 5 months 10 days	4 years 4 months 20 days
Options exercisable at end of the period	3 years 2 months 20 days
Aggregate Intrinsic Value (in thousands)
Options outstanding at the end of the period	$ 11,533
Options exercisable at end of the period	$ 9,989

Stock Incentive Plans (Detai109

Stock Incentive Plans (Details 3) - Stock options - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Stock-based compensation
Intrinsic value of options exercised	$ 1,700	$ 2,000	$ 1,333
Fair value assumptions
Risk-free interest rate	1.68%	1.82%	1.92%
Expected volatility of Company’s stock	29.66%	23.16%	25.18%
Expected dividend yield	1.82%	1.65%	1.73%
Expected life of options (years)	5 years 8 months	5 years 6 months 10 days	5 years 6 months 19 days
Weighted average fair value per option of options granted during the year (in dollars per share)	$ 7.77	$ 5.93	$ 5.88

Stock Incentive Plans (Detai110

Stock Incentive Plans (Details 4) - Restricted stock and restricted stock units - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Stock-based compensation
Intrinsic value of restricted shares vested	$ 11.4	$ 8.6	$ 5.8
Number of Shares
Shares and Units Outstanding at the Beginning of the Period (in shares)	801,085
Granted (in shares)	533,879
Vested (in shares)	(354,127)
Forfeited (in shares)	(35,331)
Shares and Units Outstanding at the End of the Period (in shares)	945,506	801,085
Weighted Average Grant Date Fair Value
Shares and Units Outstanding at the Beginning of the Period (in dollars per share)	$ 26.99
Granted (in dollars per share)	31.10
Vested (in dollars per share)	25.13
Forfeited (in dollars per share)	29.31
Shares and Units Outstanding at the at the end of the period (in dollars per share)	$ 29.92	$ 26.99

Derivative Financial Instrum111

Derivative Financial Instruments (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Net amount payable under interest rate swap		$ 1	$ 1,100
Interest rate swap credit risk exposure		25,800
Asset Derivatives, Notional Amount		3,389,146	2,465,120
Asset Derivatives, Estimated Fair Value		42,846	46,388
Liability Derivatives, Notional Amount		2,419,933	2,964,961
Liability Derivatives, Estimated Fair Value		(36,974)	(40,499)
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Amounts of gain or (loss) recognized in income on derivatives		(12,480)	1,583	$ (90)
Stand-alone derivative instruments
Derivative [Line Items]
Asset Derivatives, Notional Amount		3,389,146	2,465,120
Asset Derivatives, Estimated Fair Value		42,846	46,388
Liability Derivatives, Notional Amount		2,419,779	2,964,764
Liability Derivatives, Estimated Fair Value		(36,965)	(40,484)
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Amounts of gain or (loss) recognized in income on derivatives		(12,486)	1,575	(99)
Commercial loan interest rate swaps
Derivative [Line Items]
Liability Derivatives, Notional Amount		154
Interest rate swap contracts | Derivative instruments designated as hedges of fair value
Derivative [Line Items]
Asset Derivatives, Notional Amount	[1]	0	0
Asset Derivatives, Estimated Fair Value	[1]	0	0
Liability Derivatives, Notional Amount	[1]	154	197
Liability Derivatives, Estimated Fair Value	[1]	(9)	(15)
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Amounts of gain or (loss) recognized in income on derivatives		6	8	9
Interest rate swap contracts | Stand-alone derivative instruments
Derivative [Line Items]
Asset Derivatives, Notional Amount	[2]	1,034,298	1,074,930
Asset Derivatives, Estimated Fair Value	[2]	27,856	27,456
Liability Derivatives, Notional Amount	[2]	1,025,186	1,081,787
Liability Derivatives, Estimated Fair Value	[2]	(27,899)	(27,870)
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Amounts of gain or (loss) recognized in income on derivatives		(3,096)	2,458	40
Interest rate options contracts | Stand-alone derivative instruments
Derivative [Line Items]
Asset Derivatives, Notional Amount	[2]	222,585	55,830
Asset Derivatives, Estimated Fair Value	[2]	628	283
Liability Derivatives, Notional Amount	[2]	190,622	55,830
Liability Derivatives, Estimated Fair Value	[2]	(585)	(283)
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Amounts of gain or (loss) recognized in income on derivatives		43	0	0
Foreign exchange contracts | Stand-alone derivative instruments
Derivative [Line Items]
Asset Derivatives, Notional Amount	[2]	72,529	27,402
Asset Derivatives, Estimated Fair Value	[2]	3,970	2,276
Liability Derivatives, Notional Amount	[2]	63,339	27,002
Liability Derivatives, Estimated Fair Value	[2]	(3,671)	(2,109)
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Amounts of gain or (loss) recognized in income on derivatives		149	96	(30)
Spot foreign exchange contracts | Stand-alone derivative instruments
Derivative [Line Items]
Asset Derivatives, Notional Amount	[2]	328	512
Asset Derivatives, Estimated Fair Value	[2]	5	5
Liability Derivatives, Notional Amount	[2]	132	304
Liability Derivatives, Estimated Fair Value	[2]	0	(18)
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Amounts of gain or (loss) recognized in income on derivatives		18	(14)	0
Mortgage related derivatives | Stand-alone derivative instruments
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Amounts of gain or (loss) recognized in income on derivatives		(9,600)	(965)	$ (109)
Mortgage Banking | Interest rate swap contracts | Stand-alone derivative instruments
Derivative [Line Items]
Asset Derivatives, Notional Amount	[2]	898,000	435,000
Asset Derivatives, Estimated Fair Value	[2]	4,928	9,583
Liability Derivatives, Notional Amount	[2]	665,000	920,000
Liability Derivatives, Estimated Fair Value	[2]	(3,723)	(2,891)
Mortgage Banking | Interest rate options contracts | Stand-alone derivative instruments
Derivative [Line Items]
Asset Derivatives, Notional Amount	[2]	35,000	145,000
Asset Derivatives, Estimated Fair Value	[2]	33	1,607
Liability Derivatives, Notional Amount	[2]	0	0
Liability Derivatives, Estimated Fair Value	[2]	0	0
Mortgage Banking | Forward loan sale commitments | Stand-alone derivative instruments
Derivative [Line Items]
Asset Derivatives, Notional Amount	[2]	503,500	90,000
Asset Derivatives, Estimated Fair Value	[2]	1,604	92
Liability Derivatives, Notional Amount	[2]	475,500	871,000
Liability Derivatives, Estimated Fair Value	[2]	(1,087)	(7,301)
Mortgage Banking | Interest rate lock commitments | Stand-alone derivative instruments
Derivative [Line Items]
Asset Derivatives, Notional Amount	[2]	622,906	636,446
Asset Derivatives, Estimated Fair Value	[2]	3,822	5,086
Liability Derivatives, Notional Amount	[2]	0	8,841
Liability Derivatives, Estimated Fair Value	[2]	$ 0	$ (12)
[1]	edge fixed-rate commercial real estate loans
[2]	These portfolio swaps are not designated as hedging instruments under ASC Topic 815.

Derivative Financial Instrum112

Derivative Financial Instruments (Details 2) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Financial Assets, Gross Amount Recognized	$ 10,062	$ 13,952
Financial Assets, Gross Amount Offset	0	0
Financial Assets, Net Amount Recognized	10,062	13,952
Financial Liabilities, Gross Amount Recognized	34,338	37,927
Financial Liabilities, Gross Amount Offset	0	0
Financial Liabilities, Net Amount Recognized	34,338	37,927
Repurchase Agreements, Financial Assets, Gross Amount Recognized	0	0
Repurchase Agreements, Financial Liabilities, Gross Amount Offset	0	0
Repurchase Agreements, Financial Assets, Net Amount Recognized	0	0
Repurchase Agreements, Financial Liabilities, Gross Amount Recognized	201,207	219,824
Repurchase Agreements, Financial Liabilities, Gross Amount Offset	0	0
Repurchase Agreements, Financial Liabilities, Net Amount Recognized	201,207	219,824
Total Financial Assets, Gross Amount Recognized	10,062	13,952
Total Financial Assets, Gross Amount Offset	0	0
Total Financial Assets, Net Amount Recognized	10,062	13,952
Total Financial Liabilities, Gross Amount Recognized	235,545	257,751
Total Financial Liabilities, Gross Amount Offset	0	0
Total Financial Liabilities, Net Amount Recognized	235,545	257,751
Interest rate swaps, caps and floors
Derivative [Line Items]
Financial Assets, Gross Amount Recognized	5,698	10,727
Financial Assets, Gross Amount Offset	0	0
Financial Assets, Net Amount Recognized	5,698	10,727
Financial Liabilities, Gross Amount Recognized	31,446	29,916
Financial Liabilities, Gross Amount Offset	0	0
Financial Liabilities, Net Amount Recognized	31,446	29,916
Foreign currency forward contracts
Derivative [Line Items]
Financial Assets, Gross Amount Recognized	2,728	1,525
Financial Assets, Gross Amount Offset	0	0
Financial Assets, Net Amount Recognized	2,728	1,525
Financial Liabilities, Gross Amount Recognized	1,805	709
Financial Liabilities, Gross Amount Offset	0	0
Financial Liabilities, Net Amount Recognized	1,805	709
Mortgage related derivatives
Derivative [Line Items]
Financial Assets, Gross Amount Recognized	1,636	1,700
Financial Assets, Gross Amount Offset	0	0
Financial Assets, Net Amount Recognized	1,636	1,700
Financial Liabilities, Gross Amount Recognized	1,087	7,302
Financial Liabilities, Gross Amount Offset	0	0
Financial Liabilities, Net Amount Recognized	$ 1,087	$ 7,302

Derivative Financial Instrum113

Derivative Financial Instruments (Details 3) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Financial Assets, Net Amount Recognized	$ 10,062	$ 13,952
Financial Assets, Financial Instruments	(9,523)	(10,201)
Financial Assets, Collateral	0	0
Financial Assets, Net Amount	539	3,751
Financial Liabilities, Net Amount Recognized	34,338	37,927
Financial Liabilities, Financial Instruments	(9,523)	(10,200)
Financial Liabilities, Collateral	(24,649)	(26,010)
Financial Liabilities, Net Amount	166	1,717
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	201,207	219,824
Repurchase Agreements, Financial Liabilities, Financial Instruments	0	0
Repurchase Agreements, Financial Liabilities, Collateral	(201,207)	(219,824)
Repurchase Agreements, Financial Liabilities, Net Amount	0	0
Total Financial Assets, Net Amount Recognized	10,062	13,952
Total Financial Assets, Financial Instruments	(9,523)	(10,201)
Total Financial Assets, Collateral	0	0
Total Financial Assets, Net Amount	539	3,751
Total Financial Liabilities, Net Amount Recognized	235,545	257,751
Total Financial Liabilities, Financial Instruments	(9,523)	(10,200)
Total Financial Liabilities, Collateral	(225,856)	(245,834)
Total Financial Liabilities, Net Amount	166	1,717
Counterparty A
Derivative [Line Items]
Financial Assets, Net Amount Recognized	3,810	13
Financial Assets, Financial Instruments	(3,810)	(13)
Financial Assets, Collateral	0	0
Financial Assets, Net Amount	0	0
Financial Liabilities, Net Amount Recognized	11,137	9,556
Financial Liabilities, Financial Instruments	(3,810)	(13)
Financial Liabilities, Collateral	(7,327)	(9,543)
Financial Liabilities, Net Amount	0	0
Counterparty B
Derivative [Line Items]
Financial Assets, Net Amount Recognized	6	145
Financial Assets, Financial Instruments	(6)	(145)
Financial Assets, Collateral	0	0
Financial Assets, Net Amount	0	0
Financial Liabilities, Net Amount Recognized	7,808	3,736
Financial Liabilities, Financial Instruments	(6)	(145)
Financial Liabilities, Collateral	(7,802)	(3,591)
Financial Liabilities, Net Amount	0	0
Counterparty C
Derivative [Line Items]
Financial Assets, Net Amount Recognized	3,477	6,123
Financial Assets, Financial Instruments	(3,477)	(6,123)
Financial Assets, Collateral	0	0
Financial Assets, Net Amount	0	0
Financial Liabilities, Net Amount Recognized	4,963	10,335
Financial Liabilities, Financial Instruments	(3,477)	(6,122)
Financial Liabilities, Collateral	(1,486)	(4,213)
Financial Liabilities, Net Amount	0	0
Other counterparties
Derivative [Line Items]
Financial Assets, Net Amount Recognized	2,769	7,671
Financial Assets, Financial Instruments	(2,230)	(3,920)
Financial Assets, Collateral	0	0
Financial Assets, Net Amount	539	3,751
Financial Liabilities, Net Amount Recognized	10,430	14,300
Financial Liabilities, Financial Instruments	(2,230)	(3,920)
Financial Liabilities, Collateral	(8,034)	(8,663)
Financial Liabilities, Net Amount	$ 166	$ 1,717

Operating Segments (Details)

Operating Segments (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)reporting_unit	Dec. 31, 2015USD ($)segment	Dec. 31, 2015USD ($)		Dec. 31, 2014USD ($)		Dec. 31, 2013USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments	3	3
Net interest income			$ 465,606		$ 350,823		$ 272,336
Provision for credit losses			21,386		12,052		(5,804)
Non-interest income			322,093		221,305		154,394
Non-interest expense			534,154	[1]	436,782	[1]	294,588
Income tax expense			73,211		37,193		39,491
Net income			158,948		86,101		98,455
Total assets	$ 15,585,007	$ 15,585,007	15,585,007		14,602,099		9,641,427
Banking
Segment Reporting Information [Line Items]
Net interest income			424,883		328,326		267,131
Provision for credit losses			19,436		12,022		(6,167)
Non-interest income			127,710		115,411		92,936
Non-interest expense			355,727	[1]	350,358	[1]	259,753
Income tax expense			51,647		21,106		28,201
Net income			125,783		60,251		78,280
Total assets	13,243,710	13,243,710	13,243,710		12,698,740		9,167,127
Leasing
Segment Reporting Information [Line Items]
Net interest income			11,475		12,783		5,205
Provision for credit losses			1,598		35		363
Non-interest income			76,943		59,806		59,794
Non-interest expense			45,364	[1]	39,525	[1]	34,835
Income tax expense			16,255		12,524		11,290
Net income			25,201		20,505		18,511
Total assets	1,015,918	1,015,918	1,015,918		930,748		474,300
Mortgage Banking
Segment Reporting Information [Line Items]
Net interest income			29,248		9,714		0
Provision for credit losses			352		(5)		0
Non-interest income			117,440		46,088		1,664
Non-interest expense			133,063	[1]	46,899	[1]	0
Income tax expense			5,309		3,563		0
Net income			7,964		5,345		1,664
Total assets	$ 1,325,379	$ 1,325,379	1,325,379		972,611		0
Taylor Capital Group, Inc.
Segment Reporting Information [Line Items]
Merger expenses, banking segment			$ 5,500		$ 34,800		$ 2,500
[1]	Includes merger related expenses of $5.5 million, $34.8 million and $2.5 million in the banking segment for the years ended December 31, 2015, 2014 and 2013, respectively. Also, includes contingent consideration expense related to our acquisition of Celtic Leasing Corp. in the banking segment for the year ended December 31, 2014.

Condensed Parent Company Fin115

Condensed Parent Company Financial Information (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Assets
Cash	$ 381,441	$ 312,081	$ 473,459	$ 287,543
Other assets	297,948	297,690
Total assets	15,585,007	14,602,099	9,641,427
Liabilities and Stockholders’ Equity
Short-term borrowings	1,005,737	931,415
Junior subordinated notes issued to capital trusts	186,164	185,778
Other liabilities	400,333	382,762
Stockholders’ equity	2,087,284	2,028,286	1,326,682	1,275,770
Total liabilities and stockholders’ equity	15,585,007	14,602,099
MB Financial, Inc.
Assets
Cash	104,819	32,161	$ 122,001	$ 57,303
Investments in subsidiaries	2,147,396	2,143,408
Other assets	60,379	38,941
Total assets	2,312,594	2,214,510
Liabilities and Stockholders’ Equity
Short-term borrowings	25,000	0
Junior subordinated notes issued to capital trusts	186,164	185,778
Other liabilities	14,146	446
Stockholders’ equity	2,087,284	2,028,286
Total liabilities and stockholders’ equity	$ 2,312,594	$ 2,214,510

Condensed Parent Company Fin116

Condensed Parent Company Financial Information (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Parent Company Financial Information
Income before income taxes	$ 232,159	$ 123,294	$ 137,946
Income tax benefit	73,211	37,193	39,491
Net income	158,948	86,101	98,455
Dividends on preferred shares	8,000	4,000
Net income available to common stockholders	150,948	82,101	98,455
MB Financial, Inc.
Condensed Parent Company Financial Information
Dividends from subsidiaries	158,000	101,500	80,500
Interest and other income	469	3,097	4,215
Interest and other expense	10,637	14,636	7,143
Income before income taxes	147,832	89,961	77,572
Income tax benefit	(4,018)	(4,590)	(1,223)
Income before equity in undistributed net income of subsidiaries	151,850	94,551	78,795
Equity in undistributed net income (loss) of subsidiaries	7,098	(8,450)	19,660
Net income	158,948	86,101	98,455
Dividends on preferred shares	8,000	4,000	0
Net income available to common stockholders	$ 150,948	$ 82,101	$ 98,455

Condensed Parent Company Fin117

Condensed Parent Company Financial Information (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash Flows From Operating Activities
Net income	$ 158,948	$ 86,101	$ 98,455
Adjustments to reconcile net income to net cash provided by operating activities:
Compensation expense for share-based payment plans	14,123	8,974	5,456
Cash Flows From Investing Activities
Net decrease in loans	(663,235)	155,399	38,725
Net cash paid in business acquisition	(18,935)	25,174	0
Net cash (used in) provided by investing activities	(932,093)	674,561	(39,247)
Cash Flows From Financing Activities
Treasury stock transactions, net	(53,587)	(2,690)	(1,672)
Stock options exercised	499	1,034	1,014
Excess tax benefits from share-based payment arrangements	331	396	(325)
Dividends paid on common stock	(48,413)	(34,210)	(24,070)
Dividends paid on preferred stock	(8,000)	(2,000)	0
Net cash provided by (used in) financing activities	796,177	(1,003,386)	32,405
Net increase (decrease) in cash and cash equivalents	69,360	(161,378)	185,916
Cash:
Beginning of year	312,081	473,459	287,543
End of year	381,441	312,081	473,459
MB Financial, Inc.
Cash Flows From Operating Activities
Net income	158,948	86,101	98,455
Adjustments to reconcile net income to net cash provided by operating activities:
Compensation expense for share-based payment plans	14,123	8,974	5,456
Equity in undistributed net income of subsidiaries	(7,098)	8,450	(19,660)
Change in other assets and other liabilities	(9,145)	(8,980)	(1,460)
Net cash provided by operating activities	156,828	94,545	82,791
Cash Flows From Investing Activities
Net decrease in loans	0	0	6,960
Net cash paid in business acquisition	0	(101,546)	0
Net cash (used in) provided by investing activities	0	(101,546)	6,960
Cash Flows From Financing Activities
Treasury stock transactions, net	(53,587)	(2,690)	(1,672)
Stock options exercised	499	1,034	1,014
Excess tax benefits from share-based payment arrangements	331	396	(325)
Dividends paid on common stock	(48,413)	(34,210)	(24,070)
Dividends paid on preferred stock	(8,000)	(2,000)	0
Proceeds from short-term borrowings	25,000	0	0
Redemption of on junior subordinated notes issued to capital trusts	0	(45,369)	0
Net cash provided by (used in) financing activities	(84,170)	(82,839)	(25,053)
Net increase (decrease) in cash and cash equivalents	72,658	(89,840)	64,698
Cash:
Beginning of year	32,161	122,001	57,303
End of year	$ 104,819	$ 32,161	$ 122,001

Preferred Stock (Details)

Preferred Stock (Details) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Aug. 18, 2014
Equity [Abstract]
Preferred stock, shares outstanding	4,000,000	4,000,000	4,000,000
Preferred stock, liquidation preference per share	$ 25	$ 25
Preferred stock, dividend rate	8.00%	8.00%