MB Financial 10-K 24 Feb 17 2016 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2016	Feb. 23, 2017	Jun. 30, 2016
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, 2016
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			$ 2,573,575,204
Entity Common Stock, Shares Outstanding		83,764,663
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	FY

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Assets
Cash and due from banks	$ 364,783	$ 307,869
Interest earning deposits with banks	98,686	73,572
Total cash and cash equivalents	463,469	381,441
Investment securities:
Securities available for sale, at fair value	1,696,195	1,585,023
Securities held to maturity, at amortized cost ($1,093,740 and $1,274,767 fair value at December 31, 2016 and 2015, respectively)	1,069,750	1,230,810
Non-marketable securities - FHLB and FRB stock	143,276	114,233
Total investment securities	2,909,221	2,930,066
Loans held for sale	716,883	744,727
Loans:
Total loans, excluding purchased credit impaired loans	12,605,726	9,652,592
Purchased credit impaired loans	163,077	141,406
Total loans	12,768,803	9,793,998
Less: Allowance for loan and lease losses	139,366	128,140
Net loans	12,629,437	9,665,858
Lease investment, net	311,327	211,687
Premises and equipment, net	293,910	236,013
Cash surrender value of life insurance	200,945	136,953
Goodwill	1,001,038	725,070
Other intangibles	62,959	44,812
Mortgage servicing rights, at fair value	238,011	168,162
Other real estate owned, net	26,279	31,553
Other real estate owned related to FDIC-assisted transactions	5,006	10,717
Other assets	443,832	297,948
Total assets	19,302,317	15,585,007
Deposits:
Non-interest bearing	6,408,169	4,627,184
Interest bearing	7,702,279	6,878,031
Total deposits	14,110,448	11,505,215
Short-term borrowings	1,569,288	1,005,737
Long-term borrowings	311,790	400,274
Junior subordinated notes issued to capital trusts	210,668	186,164
Accrued expenses and other liabilities	520,914	400,333
Total liabilities	16,723,108	13,497,723
STOCKHOLDERS’ EQUITY
Preferred stock, ($0.01 par value, authorized 10,000,000 shares at December 31, 2016 and 2015; Series A, 8% perpetual non-cumulative, 4,000,000 shares issued and outstanding at December 31, 2016 and 2015, $25 liquidation value; Series B, 8% cumulative voting convertible, 125 shares issued and outstanding at December 31, 2016 and none issued and outstanding at December 31, 2015, $1,000 liquidation value)	115,572	115,280
Common stock, ($0.01 par value; authorized 120,000,000 shares at December 31, 2016 and 100,000,000 shares at December 31, 2015; issued 85,630,748 shares at December 31, 2016 and 75,566,885 shares at December 31, 2015)	856	756
Additional paid-in capital	1,678,826	1,280,870
Retained earnings	838,892	731,812
Accumulated other comprehensive income	5,190	15,777
Less: 1,905,479 and 1,888,556 shares of treasury stock, at cost, at December 31, 2016 and 2015, respectively	(60,384)	(58,504)
Controlling interest stockholders’ equity	2,578,952	2,085,991
Noncontrolling interest	257	1,293
Total stockholders’ equity	2,579,209	2,087,284
Total liabilities and stockholders’ equity	$ 19,302,317	$ 15,585,007

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Securities held to maturity, at amortized cost, fair value (in dollars)	$ 1,093,740	$ 1,274,767
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized shares	120,000,000	100,000,000
Common stock, issued shares	85,630,748	75,566,885
Treasury stock, shares	1,905,479	1,888,556
Series A Preferred Stock
Preferred stock, dividend rate (percent)	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 (in dollars per share)	$ 25	$ 25
Series B Preferred Stock
Preferred stock, dividend rate (percent)	8.00%
Preferred stock, shares issued	125	0
Preferred stock, shares outstanding	125	0
Preferred stock, liquidation preference per share (in dollars per share)	$ 1,000

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Loans:
Taxable	$ 467,877		$ 404,324		$ 292,028
Nontaxable	11,120		9,318		9,022
Investment securities:
Taxable	35,571		39,299		38,619
Nontaxable	42,022		40,974		34,791
Federal funds sold			1		25
Other interest earning accounts	587		318		663
Total interest income	557,177		494,234		375,148
Interest expense:
Deposits	25,579		19,658		17,027
Short-term borrowings	4,195		1,412		780
Long-term borrowings and junior subordinated notes	9,512		7,558		6,518
Total interest expense	39,286		28,628		24,325
Net interest income	517,891		465,606		350,823
Provision for credit losses	19,563		21,386		12,052
Net interest income after provision for credit losses	498,328		444,220		338,771
Non-interest income:
Mortgage banking revenue	148,469		117,426		46,149
Lease financing, net	73,486		76,581		64,310
Commercial deposit and treasury management fees	50,620		45,283		34,315
Trust and asset management fees	32,872		23,545		21,839
Card fees	16,071		15,322		13,741
Capital markets and international banking fees	13,332		8,148		5,458
Consumer and other deposit service fees	13,308		13,282		12,788
Brokerage fees	4,654		5,754		5,176
Loan service fees	7,457		6,259		4,814
Increase in cash surrender value of life insurance	4,075		3,391		3,381
Net gain (loss) on investment securities	447		(176)		(2,525)
Net (loss) gain on disposals of other assets	(794)		(2)		3,452
Gain on extinguishment of debt	0		0		1,895
Other operating income	10,906		7,280		6,512
Total non-interest income	374,903		322,093		221,305
Non-interest expenses:
Salaries and employee benefits	400,501		343,531		255,974
Occupancy and equipment expense	57,130		50,510		44,910
Computer services and telecommunication expense	43,468		34,453		31,678
Advertising and marketing expense	11,971		10,072		8,854
Professional and legal expense	12,879		11,053		14,652
Other intangibles amortization expense	7,305		6,115		5,501
Branch exit and facilities impairment charges	(2,709)		8,515		2,270
Net (gain) loss recognized on other real estate owned and other related expense	(1,599)		1,468		3,575
Prepayment fees on interest bearing liabilities			85		0
Other operating expenses	90,905		68,352		69,368
Total non-interest expenses	619,851	[1]	534,154	[1]	436,782
Income before income taxes	253,380		232,159		123,294
Income tax expense	79,244		73,211		37,193
Net income	174,136		158,948		86,101
Dividends on preferred shares	8,009		8,000		4,000
Net income available to common stockholders	$ 166,127		$ 150,948		$ 82,101
Common share data:
Basic earnings per common share (in dollars per share)	$ 2.16		$ 2.03		$ 1.32
Diluted earnings per common share (in dollars per share)	$ 2.13		$ 2.02		$ 1.31
Weighted average common shares outstanding for basic earnings per common share (in shares)	76,968,823		74,177,574		62,012,196
Diluted weighted average common shares outstanding for diluted earnings per common share (in shares)	77,976,121		74,849,030		62,573,406
[1]	Includes merger related expenses of $23.7 million, $5.5 million and $45.4 million in the banking segment for the years ended December 31, 2016, 2015 and 2014, respectively. Also, includes contingent consideration expense related to our acquisition of Celtic Leasing Corp. in the banking segment for the year ended December 31, 2016 and 2014.

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 174,136	$ 158,948	$ 86,101
Unrealized holding (losses) gains on investment securities, net of reclassification adjustments	(14,317)	(4,078)	20,933
Reclassification adjustment for amortization of unrealized gains on investment securities transferred to held to maturity from available for sale	(2,769)	(3,633)	(3,700)
Reclassification adjustments for (gains) losses included in net income	(447)	176	2,525
Other comprehensive (loss) income, before tax	(17,533)	(7,535)	19,758
Income tax benefit (expense) related to items of other comprehensive (loss) income	6,946	2,956	(7,785)
Other comprehensive (loss) income, net of tax	(10,587)	(4,579)	11,973
Comprehensive income	$ 163,549	$ 154,369	$ 98,074

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
Beginning 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 preferred and common stock due to business combination	518,992		196	518,796
Cash dividends declared on preferred shares	(4,000)				(4,000)
Cash dividends declared on common shares ($0.52, $0.65, and $0.74 per share in 2014, 2015, and 2016 respectively)	(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)
Ending 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 preferred and common stock due to business combination	218			218
Cash dividends declared on preferred shares	(8,000)				(8,000)
Cash dividends declared on common shares ($0.52, $0.65, and $0.74 per share in 2014, 2015, and 2016 respectively)	(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)
Ending Balance at Dec. 31, 2015	2,087,284	115,280	756	1,280,870	731,812	15,777	(58,504)	1,293
Increase (Decrease) in Stockholders' Equity
Net income	174,287				174,136			151
Other comprehensive income (loss), net of tax	(10,587)					(10,587)
Issuance of preferred and common stock due to business combination	385,099	1,227	97	383,775
Conversion of Series B preferred stock into common stock	0	(935)		935
Cash dividends declared on preferred shares	(8,009)				(8,009)
Cash dividends declared on common shares ($0.52, $0.65, and $0.74 per share in 2014, 2015, and 2016 respectively)	(59,047)				(59,047)
Restricted common stock activity, net of tax	(75)		2	(2,171)			2,094
Stock option activity, net of tax	(320)		1	(164)			(157)
Repurchase of common shares in connection with employee benefit plans and held in trust for deferred compensation plan	(3,837)			(20)			(3,817)
Stock-based compensation expense	16,868			16,868
Additional investment in subsidiary	(2,336)			(1,267)				(1,069)
Distributions to noncontrolling interest	(118)							(118)
Ending Balance at Dec. 31, 2016	$ 2,579,209	$ 115,572	$ 856	$ 1,678,826	$ 838,892	$ 5,190	$ (60,384)	$ 257

CONSOLIDATED STATEMENTS OF CHA7

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Stockholders' Equity [Abstract]
Cash dividends declared (in dollars per share)	$ 0.74	$ 0.65	$ 0.52

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash Flows From Operating Activities
Net income	$ 174,136	$ 158,948	$ 86,101
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of premises and equipment and leased equipment	75,013	61,562	60,067
Facilities impairment charges	(2,709)	8,515	2,270
Compensation expense for share-based payment plans	16,868	14,123	8,974
Loss (gain) on sales of premises and equipment and leased equipment	783	2,446	(5,817)
Amortization of other intangibles	7,305	6,115	5,501
Provision for credit losses	19,563	21,386	12,052
Deferred income tax expense	45,917	39,573	(48)
Amortization of premiums and discounts on investment securities, net	47,042	48,670	45,413
Accretion of premiums and discounts on loans, net	(29,211)	(36,651)	(21,262)
Accretion of FDIC indemnification asset		(96)	(112)
Net (gain) loss on investment securities	(447)	176	2,525
Proceeds from sale of loans held for sale	6,687,670	6,817,330	2,213,914
Origination of loans held for sale	(6,630,361)	(6,818,125)	(2,266,636)
Net gain on sale of loans held for sale	(28,896)	(34,075)	(12,022)
Origination of mortgage servicing rights	68,428	68,690	21,217
Change in fair value of mortgage servicing rights	3,666	33,648	11,777
Net (gain) loss on other real estate owned	(2,358)	969	2,000
Increase in cash surrender value of life insurance	(4,075)	(3,391)	(3,381)
Gain on extinguishment of debt	0	0	(1,895)
(Increase) decrease in other assets, net	(116,961)	(9,644)	31,205
Increase (decrease) in other liabilities, net	57,112	(37,182)	18,434
Net cash provided by operating activities	251,629	205,607	167,843
Cash Flows From Investing Activities
Decrease in federal funds sold	0	0	42,950
Proceeds from sales of investment securities available for sale	28,024	28,356	512,878
Proceeds from maturities and calls of investment securities available for sale	336,357	284,895	259,694
Purchase of investment securities available for sale	(17,702)	(276,664)	(216,777)
Proceeds from maturities and calls of investment securities held to maturity	174,201	83,061	41,654
Purchase of investment securities held to maturity	(31,410)	(339,454)	(122,859)
Purchase of non-marketable securities - FHLB and FRB stock	(60,316)	(58,664)	(15)
Redemption of non-marketable securities - FHLB and FRB stock	47,273	20,000	26,483
Net (increase) decrease in loans	(1,023,221)	(663,235)	155,399
Purchases in mortgage servicing rights	(5,087)	(823)	(1,096)
Proceeds from sale of mortgage servicing rights	0	103,105	0
Purchases of premises and equipment and leased equipment	(191,922)	(111,124)	(94,667)
Proceeds from sales of premises and equipment and leased equipment	6,819	5,374	22,924
Capital improvements on other real estate owned	(96)	0	0
Proceeds from sale of other real estate owned	15,917	7,407	9,390
Proceeds from sale of other real estate owned related to FDIC-assisted transactions	8,968	16,091	17,049
Net cash (paid) acquired in business acquisition	(9,010)	(18,935)	25,174
Purchase of additional investment in subsidiary from minority owners	(2,336)	0	0
Net payments for FDIC related covered assets	(4,113)	(11,483)	(3,620)
Net cash (used in) provided by investing activities	(727,654)	(932,093)	674,561
Cash Flows From Financing Activities
Net increase (decrease) in deposits	215,906	514,273	(343,530)
Proceeds from short-term borrowings - FHLB advances	3,175,000	1,950,000	1,050,000
Principal paid on short-term borrowings - FHLB advances	(2,975,000)	(1,875,000)	(1,480,000)
Net increase (decrease) in short-term borrowings - other	15,246	(1,284)	(167,774)
Proceeds from long-term borrowings	267,359	339,590	33,816
Principal paid on long-term borrowings	(71,845)	(22,232)	(13,059)
Redemption of junior subordinated notes issued to capital trusts	0	0	(45,369)
Treasury stock transactions, net	(3,837)	(53,587)	(2,690)
Stock options exercised	1,410	499	1,034
Dividends paid on preferred stock	(8,009)	(8,000)	(2,000)
Dividends paid on common stock	(58,177)	(48,413)	(34,210)
Net cash provided by (used in) financing activities	558,053	795,846	(1,003,782)
Net increase (decrease) in cash and cash equivalents	82,028	69,360	(161,378)
Cash and cash equivalents:
Beginning of year	381,441	312,081	473,459
End of year	463,469	381,441	312,081
Cash payments for:
Interest paid to depositors and other borrowed funds	38,538	29,151	25,258
Income tax payments, net	14,188	8,138	23,040
Supplemental Schedule of Noncash Investing Activities:
Investment securities held to maturity purchased not settled	(761)	761	0
Transfer of investment securities held to maturity to investment securities available for sale	0	0	273,471
Loans held for sale transferred to loans held for investment	0	33,613	0
Loans transferred to other real estate owned	4,945	21,576	2,133
Loans transferred to other real estate owned related to FDIC-assisted transactions	2,885	4,607	16,337
Loans transferred to repossessed vehicles	3,072	928	1,019
Operating leases rewritten as direct finance leases included as loans	910	7,666	5,853
Long-term borrowings transferred to short-term borrowings	300,000	0	0
Noncash assets acquired:
Investment securities available for sale	505,564		826,691
Investment securities held to maturity	0	0	22,599
Non-marketable securities -FHLB and FRB stock	16,000	0	50,620
Loans held for sale	0	0	670,671
Loans	1,940,702		3,532,211
Lease investments	0	0	11,885
Premises and equipment	39,048	519	19,701
Cash surrender value of life insurance	59,917	0	0
Goodwill	275,968	13,549	288,152
Other intangibles	25,452	8,838	20,079
Mortgage servicing rights	0	0	224,453
Other real estate owned	3,960	0	4,720
Other assets	32,141	744	130,478
Total noncash assets acquired	2,898,752	23,650	5,802,260
Liabilities assumed:
Deposits	2,389,327	0	3,953,213
Short-term borrowings	48,305	606	1,035,800
Long-term borrowings	16,000	0	0
Junior subordinated notes issued to capital trusts	28,075	0	80,843
Other liabilities	22,966	4,109	123,028
Total liabilities assumed	$ 2,504,673	$ 4,715	$ 5,192,884

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2016
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 95 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. 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. A loan rated "one" represents a loan least likely to default, while 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 16 years. The migration data is adjusted by using average losses for an economic cycle (approximately 15 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 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 review this data annually 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 net charge-off rates and the yield on BBB-rated debt. Commercial real estate loans and construction loans: M2 Money stock, our prior period net charge-off rates, the U.S. commercial real estate index and the CBOE Volatility Index. Using the indicators noted above, a predicted net charge-off percentage is calculated. The predicted net charge-off percentage is then compared to the cycle average net 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 net charge-offs to the predicted model net charge-offs, re-run our regression analyses 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 Accounting Standards Codification ("ASC") Topic 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 Topic 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 Topic 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 acquired loans which will offset a substantial portion of the accretion from the pass rated loans. In accordance with ASC Topic 310-30, for both purchased non-impaired loans and purchased credit-impaired loans, the difference between contractually required payments at acquisition and the cash flows expected to be collected is referred to as the non-accretable difference. Further, any excess of cash flows expected at acquisition over the estimated fair value is referred to as the accretable yield and is recognized into interest income over the remaining life of the loan when there is a reasonable expectation about the amount and timing of such cash flows. Substantially all of the loans acquired in transactions with the FDIC displayed at least some level of credit deterioration and as such are included as non-impaired and impaired loans as described immediately above. 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 (gain) 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, 2016 , 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, 2016 . 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. Preferred stock: Preferred stock issued in connection with the Taylor Capital Group, Inc. and American Chartered Bancorp, Inc. mergers 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. 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 : 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.

Business Combinations

Business Combinations	12 Months Ended
	Dec. 31, 2016
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 “ Taylor Capital 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 “Taylor Capital Merger 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 Taylor Capital Merger 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 Taylor Capital 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 Merger, 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 Topic 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 Topic 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 Topic 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 and the principal outstanding is accreted over the remaining life of the loans. In accordance with ASC Topic 310-30, for both purchased non-impaired loans (performing substandard loans) and purchased credit-impaired 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): Purchased Purchased Non-Credit-Impaired Fair value $ 204,805 $ 3,327,406 Gross contractual amounts receivable 244,650 3,707,463 Best estimate of contractual cash flows not expected to be collected (1) 34,219 302,329 Best estimate of contractual cash flows expected to be collected 210,431 3,405,134 (1) Includes interest payments not expected to be collected due to loan prepayments as well as principal and interest payments not expected to be collected due to customer default. The Company incurred costs of $7.1 million and $2.4 million to directly consummate the Taylor Capital 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 year ended December 31, 2014, 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 Year Ended December 31, 2014 (in thousands) Total revenues (net interest income plus non-interest income) $ 774,778 Net income 112,220 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 as of June 30, 2016 were determined to be final. American Chartered Bancorp, Inc. On August 24, 2016, American Chartered Bancorp, Inc. ("American Chartered"), an Illinois corporation, was merged (the "American Chartered Merger") with and into the Company, pursuant to the Agreement and Plan of Merger, dated as of November 20, 2015 (the "Merger Agreement"), by and between the Company and American Chartered. This transaction continues to solidify the Company's market position in Chicago. At the effective time of the merger (the "American Chartered Effective Time"), (i) each share of the common stock, no par value, of American Chartered ("American Chartered Common Stock") that was issued and outstanding immediately prior to the American Chartered Effective Time, (ii) each share of American Chartered’s 8% Cumulative Voting Convertible Preferred Stock, Series D ("American Chartered Series D Preferred Stock"), that was issued and outstanding immediately prior to the American Chartered Effective Time whose holder elected pursuant to American Chartered’s charter to receive the same consideration in the American Chartered Merger as holders of American Chartered Common Stock, based on the number of shares of American Chartered Common Stock into which such share of American Chartered Series D Preferred Stock would otherwise then be convertible, and (iii) each share of American Chartered Non-Voting Perpetual Preferred Stock, Series F, that was issued and outstanding immediately prior to the American Chartered Effective Time, was converted into the right to receive, subject to the election and proration procedures set forth in the Merger Agreement: (1) cash in the amount of $9.30 (the "Cash Consideration") or (2) 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 $39.01 (the average closing sale price of the Company's common stock for the five full trading days ending on August 23, 2016) (the "Stock Consideration"). The holders of such shares of American Chartered stock also could elect to receive a combination of the Cash Consideration and the Stock Consideration for their shares. Each share of American Chartered Series D Preferred Stock whose holder did not elect to receive the same consideration in the American Chartered Merger as holders of American Chartered Common Stock, based on the number of shares of American Chartered Common Stock into which such share of American Chartered Series D Preferred Stock would otherwise then be convertible, was converted into the right to receive one share of the Company's 8% cumulative voting convertible preferred stock, Series B. Consideration paid was $487.4 million , including $382.8 million in common stock ( 9.7 million shares), $102.3 million in cash and $2.3 million in preferred stock and stock-based awards assumed. The $102.3 million in cash consideration includes payments for the value of the net option shares of the American Chartered stock options pursuant to the Merger Agreement. 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 American Chartered exceeded the net assets acquired, goodwill of $276.0 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 as of December 31, 2016 have been determined only provisionally for loans as loan risk ratings continue to be assessed. Estimated fair values of the assets acquired and liabilities assumed in the American Chartered Merger, as of the closing date of the transaction were as follows (in thousands): August 24, 2016 ASSETS Cash and cash equivalents $ 93,307 Investment securities available for sale 505,564 Non-marketable securities - FRB and FHLB Stock 16,000 Loans 1,940,702 Premises and equipment 39,048 Cash surrender value of life insurance 59,917 Goodwill 275,998 Other intangibles 25,452 Other real estate owned 3,960 Other assets 32,141 Total assets $ 2,992,089 LIABILITIES Deposits $ 2,389,327 Short-term borrowings 48,305 Long-term borrowings 16,000 Junior subordinated notes issued to capital trusts 28,075 Accrued expenses and other liabilities 22,966 Total liabilities $ 2,504,673 Total identifiable net assets $ 487,416 Consideration: Market value of common stock at $39.28 per share at August 24, 2016 (9,744,636 shares of common stock issued) $ 382,769 Series B preferred stock at $2,337.97 per share at August 24, 2016 (525 shares of preferred stock issued) (1) 1,227 Stock-based compensation attributed to pre-business combination service 1,103 Cash paid 102,317 Total fair value of consideration, excluding Series B preferred stock $ 487,416 (1) Per share fair value amount determined as if the shares of Series B were converted into shares common stock. The following table presents the acquired loans as of the acquisition date (in thousands): Purchased Purchased Non-Credit-Impaired Fair value $ 51,916 $ 1,888,786 Gross contractual amounts receivable 84,000 2,159,197 Best estimate of contractual cash flows not expected to be collected (1) 23,846 114,660 Best estimate of contractual cash flows expected to be collected 60,154 2,044,537 (1) Includes interest payments not expected to be collected due to loan prepayments as well as principal and interest payments not expected to be collected due to customer default. The fair value estimates of loans decreased by $12.1 million compared to previously reported balances, which increased the deferred tax asset by $4.7 million and goodwill by $7.2 million . The accretable discount for the non-purchased credit-impaired loans was $21.1 million as of the date of the acquisition. The non-accretable and accretable discount for the purchased credit-impaired loans was $20.0 million and $5.1 million , respectively, as of the date of the acquisition. The Company incurred costs of $2.0 million directly related to the consummation of the American Chartered Merger for the year ended December 31, 2016, which is recorded in professional and legal fees on the statement of operations. The data processing systems were converted in September 2016. The following table provides the unaudited pro forma information for the results of operations for the years ended December 31, 2016 and 2015, as if the acquisition had occurred January 1, 2015. The pro forma results combine the historical results of American Chartered into the Company's consolidated statement of operations 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, 2015. 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. Years Ended December 31, 2016 2015 (in thousands) Total revenues (net interest income plus non-interest income) $ 971,846 $ 909,200 Net income 195,335 193,898 Revenues and earnings of the acquired company since the acquisition date have not been disclosed as it is not practicable as American Chartered was merged into the Company and separate financial information is not readily available.

Restrictions on Cash and Due Fr

Restrictions on Cash and Due From Banks	12 Months Ended
	Dec. 31, 2016
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 $204.8 million and $148.0 million at December 31, 2016 and 2015 , 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, 2016
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, 2016 Available for Sale U.S. Government sponsored agencies and enterprises $ 23,267 $ 148 $ — $ 23,415 States and political subdivisions 376,541 15,669 (845 ) 391,365 Residential mortgage-backed securities 988,744 5,741 (10,801 ) 983,684 Commercial mortgage-backed securities 91,949 1,221 (162 ) 93,008 Corporate bonds 193,164 1,426 (695 ) 193,895 Equity securities 11,000 — (172 ) 10,828 Total Available for Sale 1,684,665 24,205 (12,675 ) 1,696,195 Held to Maturity States and political subdivisions 910,608 21,609 (3,039 ) 929,178 Residential mortgage-backed securities 159,142 5,420 — 164,562 Total Held to Maturity 1,069,750 27,029 (3,039 ) 1,093,740 Total $ 2,754,415 $ 51,234 $ (15,714 ) $ 2,789,935 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 Total Available for Sale 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 Total Held to Maturity 1,230,810 44,595 (638 ) 1,274,767 Total $ 2,789,766 $ 78,505 $ (8,481 ) $ 2,859,790 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, 2016 . Approximately 95% of such securities were general obligation issues as of December 31, 2016 . 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, 2016 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 $ 42,806 $ (845 ) $ — $ — $ 42,806 $ (845 ) Residential mortgage-backed securities 623,732 (10,084 ) 54,990 (717 ) 678,722 (10,801 ) Commercial mortgage-backed securities 7,062 (9 ) 11,612 (153 ) 18,674 (162 ) Corporate bonds 21,028 (204 ) 20,088 (491 ) 41,116 (695 ) Equity securities 10,828 (172 ) — — 10,828 (172 ) Total Available for Sale 705,456 (11,314 ) 86,690 (1,361 ) 792,146 (12,675 ) Held to Maturity States and political subdivisions 243,568 (2,999 ) 2,988 (40 ) 246,556 (3,039 ) Total $ 949,024 $ (14,313 ) $ 89,678 $ (1,401 ) $ 1,038,702 $ (15,714 ) 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 ) Total Available for Sale 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 ) Total $ 500,346 $ (4,524 ) $ 79,851 $ (3,957 ) $ 580,197 $ (8,481 ) The total number of security positions in the investment portfolio in an unrealized loss position at December 31, 2016 was 615 compared to 193 at December 31, 2015 . 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, 2016 , 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, 2016 , 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, 2016 2015 2014 Realized gains $ 614 $ 1,470 $ 2,045 Realized losses (167 ) (1,646 ) (4,478 ) Impairment charges — — (92 ) Net losses $ 447 $ (176 ) $ (2,525 ) The amortized cost and fair value of investment securities as of December 31, 2016 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 $ 67,153 $ 67,424 Due after one year through five years 231,930 235,275 Due after five years through ten years 44,364 44,873 Due after ten years 249,525 261,103 Equity securities 11,000 10,828 Residential and commercial mortgage-backed securities 1,080,693 1,076,692 Total Available for Sale 1,684,665 1,696,195 Held to maturity: Due in one year or less 69,289 69,332 Due after one year through five years 136,426 139,892 Due after five years through ten years 166,101 171,937 Due after ten years 538,792 548,017 Residential mortgage-backed securities 159,142 164,562 Total Held to Maturity 1,069,750 1,093,740 Total $ 2,754,415 $ 2,789,935 Investment securities with carrying amounts of $1.0 billion and $1.4 billion at December 31, 2016 and 2015 , respectively, were pledged as collateral on public deposits and for other purposes as required or permitted by law, while only $756.5 million and $878.2 million were required to be pledged at December 31, 2016 and 2015 , 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 at December 31, 2015 and none were pledged at December 31, 2016 .

Loans

Loans	12 Months Ended
	Dec. 31, 2016
Receivables [Abstract]
Loans	Loans Loans consist of the following at (in thousands): December 31, 2016 2015 Commercial $ 4,346,506 $ 3,616,286 Commercial collateralized by assignment of lease payments 2,002,976 1,779,072 Commercial real estate 3,788,016 2,695,676 Residential real estate 1,060,828 628,169 Construction real estate 518,562 252,060 Indirect vehicle 541,680 384,095 Home equity 266,377 216,573 Other consumer 80,781 80,661 Gross loans, excluding purchased credit-impaired loans 12,605,726 9,652,592 Purchased credit-impaired loans 163,077 141,406 Total loans $ 12,768,803 $ 9,793,998 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, asset-based loans, residential real estate loans and indirect vehicle 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 Enterprise Risk Committee of the Company's Board of Directors on an annual basis. Commercial Loans. Commercial credit is extended primarily to emerging middle market and 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, these loans 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, marine, recreational and powersports 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 the Company's relationship with the borrower. Indirect loan and credit card underwriting involves the use of risk-based pricing in the underwriting process. Purchased credit-impaired loans. Purchased credit-impaired loans are accounted for under ASC Topic 310-30, which include purchased credit-impaired loans acquired through business combinations, FDIC-assisted transactions and re-purchase transactions with the Government National Mortgage Association ("GNMA"). The loans re-purchased from GNMA were originally sold by the Company with servicing retained and subsequently became delinquent. These loans are also insured by the Federal Housing Administration (commonly referred to as "FHA") or the U.S. Department of Veterans Affairs (commonly referred to as "VA") where the Company would be able to recover the principal balance of these loans. All re-purchases from GNMA are at the Company's discretion. 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, 2016 and 2015 , were approximately $72.2 million and $75.0 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 $30.1 million , and total repayments were $32.2 million during the year ended December 31, 2016 . 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, 2016 and 2015 , the Company had $5.5 billion and $3.2 billion , respectively, of loans pledged as collateral for Federal Home Loan Bank advances and third party letters of credit, while only $3.2 billion and $2.2 billion were required to be pledged at December 31, 2016 and 2015 , respectively. The following table presents the contractual aging of the recorded investment in past due loans by class of loans as of December 31, 2016 and 2015 (in thousands): Current 30-59 Days 60-89 Days Loans Past Due Total Total December 31, 2016 Commercial $ 4,337,348 $ 2,515 $ 156 $ 6,487 $ 9,158 $ 4,346,506 Commercial collateralized by assignment of lease payments 1,989,934 9,229 1,869 1,944 13,042 2,002,976 Commercial real estate: Healthcare 582,450 — — — — 582,450 Industrial 825,715 3,045 3,293 1,340 7,678 833,393 Multifamily 547,107 458 53 379 890 547,997 Retail 506,789 568 — — 568 507,357 Office 405,992 350 475 6,381 7,206 413,198 Other 899,950 2,385 1,155 131 3,671 903,621 Residential real estate 1,041,189 8,248 3,409 7,982 19,639 1,060,828 Construction real estate 518,171 — 391 — 391 518,562 Indirect vehicle 537,221 2,836 1,062 561 4,459 541,680 Home equity 261,765 1,219 815 2,578 4,612 266,377 Other consumer 80,443 152 120 66 338 80,781 Gross loans, excluding purchased credit-impaired loans 12,534,074 31,005 12,798 27,849 71,652 12,605,726 Purchased credit-impaired loans 86,169 6,546 6,600 63,762 76,908 163,077 Total loans $ 12,620,243 $ 37,551 $ 19,398 $ 91,611 $ 148,560 $ 12,768,803 Non-performing loan aging $ 28,364 $ 2,308 $ 978 $ 27,702 $ 30,988 $ 59,352 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 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, 2016 and 2015 (in thousands): 2016 2015 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 $ 11,222 $ 1,406 $ 24,689 $ 42 Commercial collateralized by assignment of lease payments 1,364 1,197 7,027 5,318 Commercial real estate: Healthcare — — — — Industrial 276 1,064 1,136 — Multifamily 2,662 — 3,415 — Office 896 6,381 4,496 693 Retail 384 — 17,594 — Other 83 21 1,544 195 Residential real estate 16,538 235 17,951 253 Construction real estate — — — — Indirect vehicle 2,355 10 2,046 — Home equity 13,187 — 18,156 — Other consumer 7 64 11 95 Total $ 48,974 $ 10,378 $ 98,065 $ 6,596 The reduction in interest income associated with loans on non-accrual status was approximately $3.0 million , $3.7 million , and $4.3 million for the years ended December 31, 2016 , 2015 , and 2014 , 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 potential problem and problem loans as “Special Mention,” “Substandard,” and “Doubtful.” Substandard loans include those characterized by the distinct possibility that the Company will sustain some loss if the deficiencies are not corrected. Loans classified as Doubtful have all the weaknesses inherent in those classified as Substandard with the added characteristic that the weaknesses present make collection or liquidation in full, on the basis of currently existing facts, conditions and values, highly questionable and improbable. Loans that do not currently expose the Company to sufficient risk to warrant classification in one of the aforementioned categories but possess weaknesses that deserve management's close attention are deemed to be Special Mention. Loans rated but not adversely classified are deemed to be Pass. Risk ratings are updated any time the situation warrants and at least annually. Loans 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, 2016 and 2015 (in thousands): Pass Special Substandard Doubtful Total December 31, 2016 Commercial $ 4,127,397 $ 113,838 $ 105,271 $ — $ 4,346,506 Commercial collateralized by assignment of lease payments 1,981,689 16,010 5,277 — 2,002,976 Commercial real estate: Healthcare 545,663 32,251 4,536 — 582,450 Industrial 814,668 17,962 763 — 833,393 Multifamily 544,071 312 3,614 — 547,997 Retail 498,458 8,350 549 — 507,357 Office 404,811 5,299 3,088 — 413,198 Other 820,229 44,629 38,763 — 903,621 Construction real estate 518,562 — — — 518,562 Total $ 10,255,548 $ 238,651 $ 161,861 $ — $ 10,656,060 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 Approximately $17.3 million and $59.6 million of the substandard and doubtful loans were non-performing as of December 31, 2016 and 2015 , 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, 2016 and 2015 (in thousands): Performing Non-performing Total December 31, 2016 Residential real estate $ 1,044,055 $ 16,773 $ 1,060,828 Indirect vehicle 539,315 2,365 541,680 Home equity 253,190 13,187 266,377 Other consumer 80,710 71 80,781 Total $ 1,917,270 $ 32,396 $ 1,949,666 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 The recorded investment in residential mortgage loans secured by residential real estate properties (including purchased credit-impaired loans) for which foreclosure proceedings are in process totaled $29.1 million and $20.8 million at December 31, 2016 and 2015 , respectively. The following tables present loans individually evaluated for impairment by class of loans, excluding purchased credit-impaired loans, as of December 31, 2016 and 2015 (in thousands): December 31, 2016 Unpaid Recorded Partial Allowance for Average Interest With no related allowance recorded: Commercial $ 9,056 $ 9,056 $ — $ — $ 5,944 $ — Commercial collateralized by assignment of lease payments 1,129 747 382 — 1,045 34 Commercial real estate: Healthcare — — — — — — Industrial — — — — 402 — Multifamily 1,922 1,922 — — 2,348 — Retail 2,670 929 1,741 — 2,165 — Office — — — — 256 — Other — — — — 60 — Residential real estate — — — — — — Construction real estate — — — — — — Indirect vehicle 223 122 101 — 252 — Home equity — — — — 143 — Other consumer — — — — — — With an allowance recorded: Commercial 14,403 14,403 — 2,889 22,737 — Commercial collateralized by assignment of lease payments — — — — 2,397 18 Commercial real estate: Healthcare — — — — — — Industrial — — — — — — Multifamily — — — — — — Retail 3,592 3,592 — 354 6,827 — Office — — — — 745 — Other — — — — 235 — Residential real estate 16,257 14,353 1,904 2,163 13,412 — Construction real estate — — — — — — Indirect vehicle — — — — — — Home equity 31,104 28,790 2,314 2,930 28,677 — Other consumer — — — — — — Total $ 80,356 $ 73,914 $ 6,442 $ 8,336 $ 87,645 $ 52 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 Average impaired loans for the years ended December 31, 2016 , 2015 and 2014 were $87.6 million , $108.9 million and $126.7 million , respectively. Interest income recognized on impaired loans was $52 thousand , $202 thousand and $407 thousand for the years ended December 31, 2016 , 2015 and 2014 , respectively. Impaired loans as of December 31, 2016 and 2015 included accruing restructured loans of $32.7 million and $27.0 million , respectively, that have been modified and were performing in accordance with their modified terms as of those dates. In addition, impaired loans as of December 31, 2016 and 2015 included non-performing restructured loans of $27.1 million and $23.6 million , respectively. Loans may be restructured in an effort to maximize collections from financially distressed borrowers. We use various restructuring techniques, including, but not limited to, deferring past due interest or principal, implementing an A/B note structure, redeeming past due taxes, reducing interest rates, extending maturities and modifying amortization schedules. Residential real estate loans are restructured in an effort to minimize losses while allowing borrowers to remain in their primary residences when possible. Programs that we offer to residential real estate borrowers include the Home Affordable Refinance Program (“HARP”), a restructuring program similar to the Home Affordable Modification Program (“HAMP”) for first mortgage borrowers, the Second Lien Modification Program (“2MP”) and similar programs for home equity borrowers in keeping with the restructuring techniques discussed above. Periodically, the Company will restructure a note into two separate notes (A/B structure), charging off the entire B portion of the note. The A note is structured with appropriate loan-to-value and cash flow coverage ratios that provide for a high likelihood of repayment. The A note is classified as a non-performing note until the borrower has displayed a historical payment performance for a reasonable time prior to and subsequent to the restructuring. A period of sustained repayment for at least six months generally is required to return the note to accrual status provided that management has determined that the performance is reasonably expected to continue. The A note will be classified as a restructured note (either performing or non-performing) through the calendar year of the restructuring that the historical payment performance has been established. As of December 31, 2016 and 2015 , there was one A/B structure with a recorded investment of $929 thousand and $1.0 million , respectively, which is included above as an accruing restructured loan. A loan classified as a troubled debt restructuring will no longer be included in the troubled debt restructuring disclosures in the years after the restructuring if the loan performs in accordance with the terms specified by the restructuring agreement and the interest rate specified in the restructuring agreement represents a market rate at the time of modification. The specified interest rate is considered a market rate when the interest rate is equal to or greater than the rate the Company is willing to accept at the time of restructuring for a new loan with comparable risk. If there are concerns that the borrower will not be able to meet the modified terms of the loan, the loan will continue to be included in the troubled debt restructuring disclosures. Impairment analyses on commercial-related loans classified as troubled debt restructurings are performed in conjunction with the normal allowance for loan and lease losses process. Consumer loans classified as troubled debt restructurings are aggregated in two pools that share common risk characteristics, home equity and residential real estate loans, with impairment measured on a quarterly basis based on the present value of expected future cash flows discounted at the loan's effective interest rate. The following table presents loans that were restructured during the year ended December 31, 2016 (dollars in thousands): December 31, 2016 Number of Pre-Modification Recorded Post-Modification Recorded Charge-offs and Performing: Commercial 2 $ 4,388 $ 4,388 $ 412 Residential real estate 6 939 939 $ 143 Home equity 13 2,113 2,113 172 Total 21 $ 7,440 $ 7,440 $ 727 Non-Performing: Commercial 8 $ 17,472 $ 17,472 $ 5,784 Commercial collateralized by assignment of lease payments 2 794 794 382 Residential real estate 10 1,310 1,310 245 Indirect vehicle 33 220 220 75 Home equity 42 4,933 4,933 293 Total 95 $ 24,729 $ 24,729 $ 6,779 The following table presents loans that were 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 Of the troubled debt restructurings entered into during the year ended December 31, 2016 , $224 thousand subsequently defaulted during the year. 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, 2016 (dollars in thousands): Performing Non-performing Beginning balance $ 26,991 $ 23,619 Additions 7,440 24,729 Charge-offs — (1,089 ) Principal payments, net (3,287 ) (9,270 ) Removals (1,995 ) (6,611 ) Transfer to other real estate owned — (772 ) Transfers in 4,439 901 Transfers out (901 ) (4,439 ) Ending balance $ 32,687 $ 27,068 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, 2016 (dollars in thousands): December 31, 2016 Extended Maturity, Maturity, Delay Delay in Amortization Extended in Payments and Payments or and Reduction Maturity and/or Reduction of Reduction of of Interest Rate Amortization Amount Interest Rate Total Commercial $ — $ 17,472 $ — $ 4,388 $ 21,860 Commercial collateralized by assignment of lease payments — — 794 — 794 Commercial real estate: Residential real estate 484 712 — 1,053 2,249 Indirect vehicle — — — 220 220 Home equity 3,769 2,030 — 1,247 7,046 Total $ 4,253 $ 20,214 $ 794 $ 6,908 $ 32,169 Activity in the allowance for loan and lease losses was as follows (in thousands): Year Ended December 31, 2016 2015 2014 Balance at beginning of year $ 131,508 $ 114,057 $ 113,462 Allowance for unfunded credit commitments acquired through business combination — — 1,261 Utilization of allowance for unfunded credit commitments — — (637 ) Provision for credit losses 19,563 21,386 12,052 Charge-offs: Commercial 2,126 2,993 1,339 Commercial collateralized by assignment of lease payments 6,740 2,765 925 Commercial real estate 2,851 3,563 11,438 Residential real estate 1,356 1,450 1,718 Construction real estate 593 34 79 Indirect vehicle 3,505 2,980 3,735 Home equity 1,662 1,485 3,383 Other consumer 1,778 1,941 2,128 Total charge-offs 20,611 17,211 24,745 Recoveries: Commercial 2,434 1,749 3,757 Commercial collateralized by assignment of lease payments 550 1,112 939 Commercial real estate 3,729 6,723 4,020 Residential real estate 1,210 515 1,190 Construction real estate 142 272 252 Indirect vehicle 1,837 1,853 1,736 Home equity 756 579 482 Other consumer 724 473 288 Total recoveries 11,382 13,276 12,664 Net charge-offs 9,229 3,935 12,081 Allowance for credit losses 141,842 131,508 114,057 Allowance for unfunded credit commitments (2,476 ) (3,368 ) (4,031 ) Balance at December 31, $ 139,366 $ 128,140 $ 110,026 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, 2016 and 2015 (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, 2016 Allowance for credit losses: Beginning balance $ 39,316 $ 10,434 $ 45,475 $ 5,734 $ 15,113 $ 2,418 $ 7,374 $ 2,276 $ 3,368 $ 131,508 Charge-offs 2,126 6,740 2,851 1,356 593 3,505 1,662 1,778 — 20,611 Recoveries 2,434 550 3,729 1,210 142 1,837 756 724 — 11,382 Provision 5,037 7,994 5,454 383 96 2,671 (999 ) (181 ) (892 ) 19,563 Ending balance $ 44,661 $ 12,238 $ 51,807 $ 5,971 $ 14,758 $ 3,421 $ 5,469 $ 1,041 $ 2,476 $ 141,842 Ending allowance balance attributable to loans: Individually evaluated for impairment $ 2,889 $ — $ 354 $ 2,163 $ — $ — $ 2,930 $ — $ 617 $ 8,953 Collectively evaluated for impairment 41,594 12,238 50,811 3,808 14,712 3,421 2,539 1,041 1,859 132,023 Acquired and accounted for under ASC Topic 310-30 (1) 178 — 642 — 46 — — — — 866 Total ending allowance balance $ 44,661 $ 12,238 $ 51,807 $ 5,971 $ 14,758 $ 3,421 $ 5,469 $ 1,041 $ 2,476 $ 141,842 Loans: Individually evaluated for impairment $ 23,459 $ 747 $ 6,443 $ 14,353 $ — $ 122 $ 28,790 $ — $ — $ 73,914 Collectively evaluated for impairment 4,323,047 2,002,229 3,781,573 1,046,475 518,562 541,558 237,587 80,781 — 12,531,812 Acquired and accounted for under ASC Topic 310-30 (1) 22,257 — 46,994 72,184 4,832 — 14,549 2,261 — 163,077 Total ending loans balance $ 4,368,763 $ 2,002,976 $ 3,835,010 $ 1,133,012 $ 523,394 $ 541,680 $ 280,926 $ 83,042 $ — $ 12,768,803 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 Topic 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 Topic 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 (1) Loans acquired in business combinations and accounted for under ASC Topic 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 Topic 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 Topic 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 Topic 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 and the principal outstanding is accreted over the remaining life of the loans. In accordance with ASC 310-30, for both purchased non-impaired loans and purchased credit-impaired 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. 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, 2016 , there was a provision for credit losses of $144 thousand and there were net charge-offs of $1.4 million in relation to purchased loans. During the year ended December 31, 2015 , there was a provision for credit losses of $2.0 million and net recoveries of $2.8 million in relation to purchased loans. There was $866 thousand in allowance for loan and lease losses related to these purchased loans at December 31, 2016 and $2.1 million at December 31, 2015 . 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 Topic 310-30 were as follows for the years ended December 31, 2016 and 2015 (in thousands): Year Ended December 31, 2016 2015 Balance at beginning of period $ 12,596 $ 7,434 Purchases 5,086 — Accretion (9,585 ) (9,637 ) Other (1) 7,953 14,799 Balance at end of period $ 16,050 $ 12,596 (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 Topic 310-30. In our FDIC-assisted transactions, the fair value of purchased credit-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, we 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. For other loans acquired through business combinations, the fair value of purchased credit-impaired loans, on the acquisition date, was determined based on ass

Lease Investments

Lease Investments	12 Months Ended
	Dec. 31, 2016
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, 2016 2015 Direct finance leases: Minimum lease payments $ 433,451 $ 392,901 Estimated unguaranteed residual values 78,256 74,411 Less: unearned income (36,327 ) (34,675 ) Direct finance leases (1) $ 475,380 $ 432,637 Leveraged leases: Minimum lease payments $ 821 $ 3,286 Estimated unguaranteed residual values 108 523 Less: unearned income (25 ) (126 ) Less: related non-recourse debt (803 ) (3,199 ) Leveraged leases (1) $ 101 $ 484 Operating leases: Equipment, at cost $ 440,861 $ 318,843 Less accumulated depreciation (129,534 ) (107,156 ) Lease investments, net $ 311,327 $ 211,687 (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 $66.9 million at December 31, 2016 and $55.0 million at December 31, 2015 . 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 2017 $ 157,419 $ 642 $ 68,132 $ 226,193 2018 116,334 179 53,383 169,896 2019 76,393 — 38,013 114,406 2020 44,327 — 23,500 67,827 2021 21,723 — 16,157 37,880 Thereafter 17,255 — 21,034 38,289 $ 433,451 $ 821 $ 220,219 $ 654,491 At December 31, 2016 , 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 2017 $ 17,927 $ 89 $ 13,121 $ 31,137 2018 16,072 19 11,531 27,622 2019 16,776 — 12,662 29,438 2020 11,075 — 15,859 26,934 2021 3,266 — 19,772 23,038 Thereafter 13,140 — 27,055 40,195 $ 78,256 $ 108 $ 100,000 $ 178,364 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 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 4,248 leases at December 31, 2016 compared to 4,369 at December 31, 2015 . The average residual value per lease schedule was approximately $42 thousand at December 31, 2016 and $33 thousand at December 31, 2015 . The average residual value per master lease schedule was approximately $176 thousand at December 31, 2016 and $132 thousand at December 31, 2015 . Income from lease financing, net was composed of (in thousands): Years Ended December 31, 2016 2015 2014 Rental income $ 69,083 $ 59,668 $ 67,135 Equipment maintenance contracts revenue, net of cost of sales 25,005 23,027 16,441 Vendor promotional income 11,073 8,527 8,382 Other lease related revenue 4,254 5,769 2,356 Gain on sale of lease payments and leased equipment, net of residual write downs 13,241 17,006 9,546 Income on lease investments, gross 122,656 113,997 103,860 Less: depreciation on operating leases (49,170 ) (37,416 ) (39,550 ) Lease financing, net $ 73,486 $ 76,581 $ 64,310 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, 2016
Property, Plant and Equipment [Abstract]
Premises and Equipment	Premises and Equipment Premises and equipment consisted of (in thousands): December 31, 2016 2015 Land and land improvements $ 81,468 $ 67,089 Buildings 122,268 100,041 Furniture and equipment 182,924 139,648 Buildings and leasehold improvements 76,602 61,383 463,262 368,161 Accumulated depreciation (169,352 ) (132,148 ) Premises and equipment, net $ 293,910 $ 236,013 Depreciation on premises and equipment totaled $25.5 million , $22.1 million , and $20.4 million for the years ended December 31, 2016 , 2015 , and 2014 , respectively.

Goodwill and Intangibles

Goodwill and Intangibles	12 Months Ended
	Dec. 31, 2016
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 2016 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, 2016 , 2015 , or 2014 . The carrying amount of goodwill was $1.0 billion at December 31, 2016 and $725.1 million December 31, 2015 . The increase of $276.0 million in goodwill was due to the American Chartered merger. The following table presents the changes in the carrying amount of goodwill as of December 31, 2016 and 2015 (in thousands): December 31, 2016 2015 Banking Leasing Mortgage banking Total Banking Leasing Mortgage banking Total Balance at beginning of period $ 684,430 $ 40,640 $ — $ 725,070 $ 670,881 $ 40,640 $ — $ 711,521 Goodwill from business combinations (1) 275,968 — — 275,968 13,549 — — 13,549 Balance at end of period $ 960,398 $ 40,640 $ — $ 1,001,038 $ 684,430 $ 40,640 $ — $ 725,070 (1) Due to the American Chartered merger and adjustments recognized for the MSA acquisition. The Company has other intangible assets consisting of core deposit and client relationship intangibles that had a remaining weighted average amortization period of approximately thirteen years as of December 31, 2016 . The Company recorded a $25.5 million core deposit intangible in 2016 due to the American Chartered merger. 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, 2016 and 2015 (in thousands): December 31, 2016 2015 Balance at beginning of period $ 44,812 $ 38,006 Amortization expense (7,305 ) (6,115 ) Other intangibles from business combinations 25,452 12,921 Balance at end of period $ 62,959 $ 44,812 Gross carrying amount $ 112,820 $ 93,292 Accumulated amortization (49,861 ) (48,480 ) Net book value $ 62,959 $ 44,812 The following presents the estimated amortization expense of other intangible assets (in thousands): Years ending December 31, Amount 2017 $ 8,193 2018 7,451 2019 5,674 2020 5,022 2021 4,790 Thereafter 31,829 $ 62,959

Deposits

Deposits	12 Months Ended
	Dec. 31, 2016
Banking and Thrift [Abstract]
Deposits	Deposits The composition of deposits was as follows (in thousands): December 31, 2016 2015 Demand deposit accounts, noninterest bearing $ 6,408,169 $ 4,627,184 NOW and money market accounts 4,543,004 4,144,633 Savings accounts 1,135,992 974,555 Certificates of deposit, $250,000 or more 1,144,121 877,352 Other certificates of deposit 879,162 881,491 Total $ 14,110,448 $ 11,505,215 Certificates of deposit of $250,000 or more included $795.0 million and $500.2 million of brokered deposits at December 31, 2016 and 2015 , 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, 2016 , the scheduled maturities of certificates of deposit were as follows (in thousands): 2017 $ 1,224,620 2018 444,103 2019 147,591 2020 145,410 2021 50,597 Thereafter 10,962 $ 2,023,283

Short-Term Borrowings

Short-Term Borrowings	12 Months Ended
	Dec. 31, 2016
Debt Disclosure [Abstract]
Short-Term Borrowings	Short-Term Borrowings Short-term borrowings were as follows as of December 31, 2016 and 2015 (dollars in thousands): December 31, 2016 2015 Weighted Average Weighted Average Cost Amount Cost Amount Customer repurchase agreements 0.22 % $ 237,538 0.20 % $ 201,207 Federal Home Loan Bank advances 0.63 1,275,000 0.17 775,000 Federal funds purchased 0.80 46,750 0.09 4,530 Line of credit 2.52 10,000 2.18 25,000 Total 0.59 % $ 1,569,288 0.23 % $ 1,005,737 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 $1.3 billion at December 31, 2016 and $775.0 million at December 31, 2015 . At December 31, 2016 , the interest rate on the advances outstanding on that date ranged from 0.41% to 0.70% with maturities from January 3, 2017 to December 8, 2017 . 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 at the parent company level. Interest is payable at a rate of one month LIBOR + 1.75% . As of December 31, 2016 , $10.0 million was outstanding and $25.0 million was outstanding at December 31, 2015 . The line of credit is scheduled to mature on June 30, 2017.

Long-term Borrowings

Long-term Borrowings	12 Months Ended
	Dec. 31, 2016
Debt Disclosure [Abstract]
Long-term Borrowings	Long-term Borrowings Long-term borrowings were as follows as of December 31, 2016 and 2015 (dollars in thousands): December 31, 2016 2015 Weighted Average Weighted Average Cost Amount Cost Amount Federal Home Loan Bank advances 0.85 % $ 230,865 0.45 % $ 305,239 Notes payable 4.18 66,925 4.30 54,998 Structured repurchase agreement — — 4.75 40,037 Term note 2.52 14,000 — — Total 1.64 % $ 311,790 1.41 % $ 400,274 The Company had FHLB advances with original contractual maturities greater than one year of $230.9 million and $305.2 million at December 31, 2016 and 2015 , respectively. As of December 31, 2016 , the advances had fixed terms with effective interest rates, net of discounts, ranging from 0.30% to 5.87% and maturities ranging from March 2018 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 $66.9 million and $55.0 million at December 31, 2016 and 2015 , respectively, which as of December 31, 2016 , were accruing interest at rates ranging from 2.25% to 7.40% , with a weighted average rate of 4.18% . Lease investments include equipment with an amortized cost of $79.6 million and $65.8 million at December 31, 2016 and 2015 , respectively, that is pledged as collateral on these notes. On August 24, 2016, the Company assumed a $16.0 million unsecured term loan at the holding company level with a correspondent bank through the American Chartered merger. Interest is payable at a rate of one month LIBOR + 1.75% and matures on June 30, 2020. Principal payments of $1.0 million are due quarterly until maturity. As of December 31, 2016 , $14.0 million was outstanding. The Company had a $40.0 million 10 -year structured repurchase agreement as of December 31, 2015 , which had a fixed rate borrowing of 4.75% and expired in March 2016. The principal payments on long-term borrowings are due as follows (in thousands): Amount Years ending December 31, 2017 $ 109,510 2018 174,908 2019 15,562 2020 6,553 2021 1,345 Thereafter 3,912 Total $ 311,790

Junior Subordinated Notes Issue

Junior Subordinated Notes Issued to Capital Trusts	12 Months Ended
	Dec. 31, 2016
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 2 regulatory capital. Prior to the completion of the American Chartered merger, the trust preferred securities qualified, and were 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, 2016 (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 American Chartered Statutory Trust I (4) American Chartered Statutory Trust II (4) Junior Subordinated Notes: Principal balance $ 20,619 $ 10,464 Annual interest rate 3-mo LIBOR + 3.60% 3-mo LIBOR + 2.75% Stated maturity date December 18, 2031 October 7, 2034 Call date December 18, 2006 October 7, 2009 Trust Preferred Securities: Face Value $ 20,000 $ 10,000 Annual distribution rate 3-mo LIBOR + 3.60% 3-mo LIBOR + 2.75% Issuance date November 2001 August 2004 Distribution dates (1) 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 $6.8 million as of December 31, 2016 . (4) American Chartered Statutory Trust I and American Chartered Statutory Trust II were established by American Chartered prior to the Company's acquisition of American Chartered in August 2016, and the junior subordinated notes issued by American Chartered to American Chartered Statutory Trust I and American Chartered Statutory Trust II were assumed by the Company upon completion of the acquisition. Principal balance and face value amounts associated with American Chartered Statutory Trust I and American Chartered Statutory Trust II do not include purchase accounting adjustments to such amounts, which in each case resulted in a discount of $6.4 million as of December 31, 2016 . 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, 2016
Leases [Abstract]
Lease Commitments and Rental Expense	Lease Commitments and Rental Expense The Company leases office space for certain branch offices. At December 31, 2016 , 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 2017 $ 11,972 $ 1,384 $ 10,588 2018 10,472 1,252 9,220 2019 9,487 989 8,498 2020 6,067 420 5,647 2021 5,003 175 4,828 Thereafter 22,883 — 22,883 $ 65,884 $ 4,220 $ 61,664 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, 2016 , 2015 , and 2014 amounted to $10.9 million , $8.9 million , and $7.4 million , respectively.

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2016
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 2016 , 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, 2016 was estimated to be $14.8 million and was $14.2 million and $7.4 million for the years ended December 31, 2015 and 2014 , 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 $806 thousand for the year ended December 31, 2016 . These contributions were $839 thousand and $512 thousand for the years ended December 31, 2015 and 2014 , 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, 2016 , the fair value of the assets held in other publicly traded funds totaled $18.7 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 $1.3 million for the year ended December 31, 2016 .

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The deferred taxes consist of (in thousands): December 31, 2016 2015 Deferred tax asset: Allowance for credit losses $ 55,525 $ 51,256 State net operating loss carryforwards 20,570 22,624 Other real estate owned 9,845 11,165 Stock options and restricted stock 9,675 7,317 Loans 36,770 36,386 Deferred compensation 8,556 8,550 Tax credit carryforwards 32,262 27,904 Bonus accrual 4,877 3,827 Other items 666 1,008 Total deferred tax asset 178,746 170,037 Valuation allowance — — Total deferred tax asset, net of valuation allowance 178,746 170,037 Deferred tax liability: Equipment leasing (152,282 ) (132,159 ) Premises and equipment (25,015 ) (21,371 ) Mortgage servicing rights (76,468 ) (59,369 ) Deferred income from FDIC-assisted transactions (46,443 ) (43,102 ) Investment securities (7,270 ) (2,317 ) FHLB stock dividends (3,221 ) (3,207 ) Core deposit intangible (15,516 ) (7,448 ) Other items (893 ) (3,509 ) Total deferred tax liability (327,108 ) (272,482 ) Net deferred tax liability (148,362 ) (102,445 ) Net unrealized holding gain on investment securities available for sale (3,296 ) (10,137 ) Net deferred tax liability $ (151,658 ) $ (112,582 ) The Company’s Illinois net operating loss carryforwards totaled $404.3 million at December 31, 2016 and begin to expire in 2022 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 $26.7 million with an indefinite carryforward period and general business credits of $5.4 million with expiration dates occurring in 2028 through 2036. Management has determined that is more likely than not that the deferred tax assets, including the net operating loss carryforwards, as of December 31, 2016 , will be realized and that no valuation allowance is required. The Company also had other state net operating loss carryforwards totaling $3.4 million at December 31, 2016 , 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, 2016 2015 2014 Current expense (benefit): Federal $ 26,081 $ 30,283 $ 25,270 State 7,204 3,355 11,971 Foreign 42 — — 33,327 33,638 37,241 Deferred expense (benefit): Federal 37,690 28,765 3,122 State 8,227 10,808 (3,170 ) Foreign — — — 45,917 39,573 (48 ) $ 79,244 $ 73,211 $ 37,193 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, 2016 2015 2014 Federal income tax expense at expected statutory rate $ 88,683 $ 81,256 $ 43,153 Increase (decrease) due to: Tax exempt income, net (18,214 ) (16,909 ) (14,848 ) State tax expense net of federal impact 10,030 9,205 5,721 Non-deductible contingent consideration 1,026 158 3,738 Non-includable increase in cash surrender value of life insurance (1,432 ) (1,191 ) (1,120 ) Non-deductible merger expense 298 360 988 Adjustment of tax contingency reserves 1 (969 ) (31 ) Other items, net (1,148 ) 1,301 (408 ) Income tax expense $ 79,244 $ 73,211 $ 37,193 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, 2016 to December 31, 2016 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, 2016 $ 17 $ 2 $ 19 Increases for tax positions of prior years — 1 1 Balance at December 31, 2016 $ 17 $ 3 $ 20 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 2013 tax return year and forward. The Company’s various state income tax returns are generally open for the 2012 tax return year and forward based on individual state statutes of limitation. The Company is currently under examination by federal and state taxing authorities.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2016
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, 2016 and 2015 , the following financial instruments were outstanding, the contractual amounts of which represent off-balance sheet credit risk (in thousands): Contractual Amount 2016 2015 Commitments to extend credit: Home equity lines $ 235,279 $ 187,478 Other commitments 3,679,259 3,049,152 Letters of credit: Standby 185,386 137,945 Commercial 1,766 1,108 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, 2016 , 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, 2016 , 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 $48.1 million to $187.2 million from $139.1 million at December 31, 2015 . Of the $187.2 million in commitments outstanding at December 31, 2016 , approximately $158.1 million of the letters of credit have been issued or renewed since December 31, 2015 . 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, 2016 , the Company had approximately $3.5 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, 2016 , 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, 2016 . 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, 2016
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, 2016 and 2015 . As of December 31, 2016 , 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, 2016 , 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, 2016 Total capital (to risk-weighted assets): Consolidated $ 1,878,106 11.63 % $ 1,292,159 8.00 % N/A N/A MB Financial Bank 1,812,202 11.26 1,287,099 8.00 $ 1,608,874 10.00 % Tier 1 capital (to risk-weighted assets): Consolidated $ 1,518,472 9.40 % 969,119 6.00 % N/A N/A MB Financial Bank 1,670,360 10.38 965,324 6.00 1,287,099 8.00 % Common equity tier 1 capital (to risk-weighted assets): Consolidated $ 1,408,481 8.72 % 726,839 4.50 % N/A N/A MB Financial Bank 1,670,360 10.38 723,993 4.50 1,045,768 6.50 % Tier 1 capital (to average assets): Consolidated $ 1,518,472 8.38 % 724,519 4.00 % N/A N/A MB Financial Bank 1,670,360 9.25 721,954 4.00 902,442 5.00 % 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 % N/A — not applicable The Company and the Bank must maintain a capital conservation buffer consisting of additional CET1 capital greater than 2.5% of risk-weighted assets above the required minimum risk-based capital levels in order to avoid limitations on paying dividends, repurchasing shares, and paying discretionary bonuses. The capital conservation buffer requirement began to be phased in on January 1, 2016 when a buffer greater than 0.625% of risk-weighted assets was required, which amount increases each year until the buffer requirement is fully implemented on January 1, 2019. The conservation buffers for the Company and the Bank exceed the fully phased in minimum as of December 31, 2016 .

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2016
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, 2016 and 2015 , 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) 2016 Financial assets Securities available for sale: U.S. Government sponsored agencies and enterprises $ 23,415 $ — $ 23,415 $ — States and political subdivisions 391,365 — 390,992 373 Residential mortgage-backed securities 983,684 — 983,513 171 Commercial mortgage-backed securities 93,008 — 93,008 — Corporate bonds 193,895 — 193,895 — Equity securities 10,828 10,828 — — Loans held for sale 716,883 — 716,883 — Loans 16,273 — 16,273 — Mortgage servicing rights 238,011 — — 238,011 Assets held in trust for deferred compensation 18,723 18,723 — — Derivative financial instruments 44,586 7,687 33,739 3,160 Financial liabilities Other liabilities (1) 18,723 18,723 — — Derivative financial instruments 63,885 2,046 61,839 — 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 — (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, 2016 Valuation Technique Unobservable Input Range (in thousands) States and political subdivisions $ 373 Discounted cash flows Credit assumption 50% Loss Residential mortgage-backed securities 171 Discounted cash flows Constant pre-payment rates (CPR) 1% - 3% Mortgage servicing rights 238,011 Discounted cash flows CPR 7.0% - 8.3% Discount rate 9.50 - 12.00 Maturity (months) 323 - 357 Delinquencies 0.51 - 3.87 Costs to service $ 66 - $ 226 Additive delinquent costs to service $ 175 - $ 1,000 Derivative financial instruments (mortgage 3,160 Sales cash flows Expected closing ratio 70% - 95% interest rate lock commitments) Expected delivery price 97.13 bps - 108.85 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, 2016 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, 2016 Weighted average prepayment speed (CPR) 7.50 % Impact on fair value of 10% adverse change $ (7,409 ) Impact on fair value of 20% adverse change (14,415 ) Weighted average discount rate 9.80 % Impact on fair value of 10% adverse change $ (10,159 ) Impact on fair value of 20% adverse change (19,521 ) Weighted average delinquency rate 2.14 % Impact on fair value of 10% adverse change $ (2,393 ) Impact on fair value of 20% adverse change (4,248 ) Weighted average costs to service $ 90 Impact on fair value of 10% adverse change (4,546 ) Impact on fair value of 20% adverse change (9,093 ) The Company did not have any transfers between Level 1 and Level 2 of the fair value hierarchy during the year ended December 31, 2016 . 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, 2016 2015 2016 2015 2016 2015 Investment Securities Mortgage Servicing Rights Derivatives Balance, beginning of period $ 773 $ 973 $ 168,162 $ 235,402 $ 3,822 $ 5,074 Acquired through business combination — — — — 146 — Purchases — — 5,087 823 — — Originations — — 68,428 68,690 — — Included in earnings — — (3,666 ) (33,648 ) (808 ) (1,252 ) Principal payments (229 ) (200 ) — — — — Sales — — — (103,105 ) — — Balance, ending of period $ 544 $ 773 $ 238,011 $ 168,162 $ 3,160 $ 3,822 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, 2016 ), 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, 2016 and 2015 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) 2016 Financial assets: Impaired loans $ 54,576 $ — $ — $ 54,576 Non-financial assets: Foreclosed assets 31,607 — — 31,607 2015 Financial assets: Impaired loans $ 76,203 $ — $ — $ 76,203 Non-financial assets: Foreclosed assets 42,351 — — 42,351 The following table presents additional information about the unobservable inputs used in the fair value measurement of financial and non-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, 2016 Technique Unobservable Input Range Impaired loans $ 54,576 Appraisal of collateral Appraisal adjustments - sales costs 5% - 10% Foreclosed assets 31,607 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, 2016 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 $ 364,783 $ 364,783 $ 364,783 $ — $ — Interest bearing deposits with banks 98,686 98,686 98,686 — — Investment securities available for sale 1,696,195 1,696,195 10,828 1,684,823 544 Investment securities held to maturity 1,069,750 1,093,740 — 1,093,740 — Non-marketable securities - FHLB and FRB stock 143,276 143,276 — — 143,276 Loans held for sale 716,883 716,883 — 716,883 — Loans, net 12,629,437 12,747,107 — 16,273 12,730,834 Accrued interest receivable 59,024 59,024 59,024 — — Derivative financial instruments 44,586 44,586 7,687 33,739 3,160 Financial Liabilities: Non-interest bearing deposits $ 6,408,169 $ 6,408,169 $ 6,408,169 $ — $ — Interest bearing deposits 7,702,279 7,698,839 — — 7,698,839 Short-term borrowings 1,569,288 1,569,314 — — 1,569,314 Long-term borrowings 311,790 317,028 — — 317,028 Junior subordinated notes issued to capital trusts 210,668 157,098 — — 157,098 Accrued interest payable 4,288 4,288 4,288 — — Derivative financial instruments 63,885 63,885 2,046 61,839 — 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 —

Stock Incentive Plans

Stock Incentive Plans	12 Months Ended
	Dec. 31, 2016
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, 2016 2015 2014 Total compensation expense for share-based payment plans during the year $ 16,868 $ 14,123 $ 8,974 Amount of related income tax benefit recognized in income 8,983 5,515 3,528 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, 2016 , there were 3,811,383 shares available for future grants. Annual equity-based incentive awards are generally granted to selected officers and employees 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, 2016 : 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, 2015 2,192,431 $ 27.77 4.44 Granted 405,678 31.74 Assumed (1) 107,344 19.74 Exercised (692,790 ) 28.96 Expired (36,341 ) 39.65 Forfeited or cancelled (35,917 ) 31.03 Options outstanding as of December 31, 2016 1,940,405 $ 27.45 5.31 $ 38,382 Options exercisable as of December 31, 2016 1,230,520 $ 26.43 3.55 $ 25,591 (1) Reflects stock options assumed through the American Chartered merger. 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, 2016 , 2015 , and 2014 : For the Years Ended December 31, 2016 2015 2014 Risk-free interest rate 1.44 % 1.68 % 1.82 % Expected volatility of Company’s stock 28.08 % 29.66 % 23.16 % Expected dividend yield 2.19 % 1.82 % 1.65 % Expected life of options (years) 5.5 5.7 5.5 Weighted average fair value per option of options granted during the year $ 6.66 $ 7.77 $ 5.93 The total intrinsic value of options exercised during the years ended December 31, 2016 , 2015 and 2014 was $7.0 million , $1.7 million and $2.0 million , respectively. The following is a summary of changes in restricted shares and units for the year ended December 31, 2016 : Number of Shares Weighted Average Grant Date Fair Value Shares and Units Outstanding at December 31, 2015 945,506 $ 29.92 Granted 483,467 31.24 Assumed (1) 5,191 32.45 Vested (409,550 ) 28.40 Forfeited or cancelled (25,807 ) 29.99 Shares and Units Outstanding at December 31, 2016 998,807 31.20 (1) Reflects restricted shares assumed through the American Chartered merger. The total intrinsic value of restricted shares that vested during the years ended December 31, 2016 , 2015 and 2014 was $15.9 million , $11.4 million and $8.6 million , respectively. The Company issued 80,780 , 71,560 and 48,569 market-based restricted stock units in 2016, 2015 and 2014, 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 Company issued 56,752 market-based restricted stock units in 2013 that vested in 2016. Recipients earned shares totaling 175% 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. 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. As of December 31, 2016 , there was $21.3 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, 2016 , the weighted-average period over which the unrecognized compensation expense is expected to be recognized was approximately two years.

Derivative Financial Instrument

Derivative Financial Instruments	12 Months Ended
	Dec. 31, 2016
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, 2016 was approximately $1 thousand , and the net amount payable at December 31, 2015 was approximately $1 thousand . The Company's credit exposure on interest rate swaps is limited to the Company's net favorable value and interest payments of all swaps to each counterparty. In such cases, collateral is generally required from the counterparties involved if the net value of the swaps exceeds a nominal amount. At December 31, 2016 , the Company’s credit exposure relating to interest rate swaps was approximately $15.5 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 $107 thousand at December 31, 2016 . 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, 2016 and 2015 (in thousands): Asset Derivatives Liability Derivatives December 31, 2016 December 31, 2015 December 31, 2016 December 31, 2015 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) $ — $ — $ — $ — $ 107 $ (4 ) $ 154 $ (9 ) Stand-alone derivative instruments: (2) Interest rate swap contracts 1,310,057 25,471 1,034,298 27,856 1,310,057 (25,471 ) 1,025,186 (27,899 ) Interest rate options contracts 217,546 881 222,585 628 217,546 (881 ) 190,622 (585 ) Foreign exchange contracts 40,641 4,429 72,529 3,970 40,505 (4,265 ) 63,339 (3,671 ) Spot foreign exchange contracts 1,691 12 328 5 660 (5 ) 132 — Mortgage banking derivatives: Interest rate swap contracts 383,000 2,946 898,000 4,928 1,458,000 (31,212 ) 665,000 (3,723 ) Treasury futures contracts 15,500 41 — — — — — — TBA mortgage securities — — 35,000 33 55,000 (132 ) — — Forward loan sale commitments 585,000 7,646 503,500 1,604 386,000 (1,915 ) 475,500 (1,087 ) Interest rate lock commitments 543,901 3,160 622,906 3,822 — — — — Total non-hedging derivative instruments 3,097,336 44,586 3,389,146 42,846 3,467,768 (63,881 ) 2,419,779 (36,965 ) Total $ 3,097,336 $ 44,586 $ 3,389,146 $ 42,846 $ 3,467,875 $ (63,885 ) $ 2,419,933 $ (36,974 ) (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, 2016 2015 2014 Derivative instruments designated as hedges of fair value: Interest rate swap contracts $ 5 $ 6 $ 8 Stand-alone derivative instruments: Interest rate swap contracts 7,571 404 2,458 Interest rate options contracts 36 43 — Foreign exchange contracts 970 149 96 Spot foreign exchange contracts 963 18 (14 ) Mortgage related derivatives (1,509 ) (13,100 ) (965 ) Total non-hedging derivative instruments 8,031 (12,486 ) 1,575 Total $ 8,036 $ (12,480 ) $ 1,583 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, 2016 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 $ 7,885 $ — $ 7,885 $ 18,564 $ — $ 18,564 Foreign currency forward contracts 4,315 — 4,315 1,674 — 1,674 Mortgage banking derivatives 10,633 — 10,633 33,259 — 33,259 Total derivatives 22,833 — 22,833 53,497 — 53,497 Repurchase agreements — — — 237,538 — 237,538 Total $ 22,833 $ — $ 22,833 $ 291,035 $ — $ 291,035 Financial Assets Financial Liabilities Net Amount Recognized Financial Instruments Collateral Net Amount Net Amount Recognized Financial Instruments Collateral Net Amount Derivatives: Counterparty A $ 2,697 $ (2,697 ) $ — $ — $ 18,768 $ (2,697 ) $ (16,071 ) $ — Counterparty B 4,683 (4,683 ) — — 12,881 (4,683 ) (8,198 ) — Counterparty C 64 (64 ) — — 4,919 (64 ) (4,855 ) — Other counterparties 15,389 (10,938 ) — 4,451 16,929 (10,938 ) (5,980 ) 11 Total derivatives 22,833 (18,382 ) — 4,451 53,497 (18,382 ) (35,104 ) 11 Repurchase agreements — — — — 237,538 — (237,538 ) — Total $ 22,833 $ (18,382 ) $ — $ 4,451 $ 291,035 $ (18,382 ) $ (272,642 ) $ 11 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

Operating Segments

Operating Segments	12 Months Ended
	Dec. 31, 2016
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, deposit gathering and fee business 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 the Banking Segment's loan portfolio and management’s assessment of the collectability of the loan portfolio as well as prevailing economic and market conditions. The Banking Segment is also subject to an extensive system of laws and regulations that are intended primarily for the protection of depositors and other customers, federal deposit insurance funds and the banking system as a whole. 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 the Company leases (referred to as direct finance, leveraged or operating leases) to "Fortune 1000," 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 residential mortgage loans for sale to investors and for the Company's portfolio through its retail and third party originator 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 and Mortgage Banking segments include adjustments based on the Company's internal funds transfer pricing model. Non-interest income for the Leasing Segment includes income on loans originated for the sole purpose of funding equipment purchases related to leases at the Company's lease subsidiaries. The following tables present summary financial information for the reportable segments (in thousands): Banking Leasing Mortgage Banking Consolidated Year ended December 31, 2016 Net interest income $ 475,133 $ 9,415 $ 33,343 $ 517,891 Provision for credit losses 18,583 295 685 19,563 Non-interest income 153,250 73,503 148,150 374,903 Non-interest expense (1) 421,733 48,450 149,668 619,851 Income tax expense 53,263 13,525 12,456 79,244 Net income $ 134,804 $ 20,648 $ 18,684 $ 174,136 Total assets $ 16,368,881 $ 1,224,169 $ 1,709,267 $ 19,302,317 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 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 (1) Includes merger related expenses of $23.7 million , $5.5 million and $45.4 million in the banking segment for the years ended December 31, 2016, 2015 and 2014, respectively. Also, includes contingent consideration expense related to our acquisition of Celtic Leasing Corp. in the banking segment for the year ended December 31, 2016 and 2014.

Condensed Parent Company Financ

Condensed Parent Company Financial Information	12 Months Ended
	Dec. 31, 2016
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, 2016 2015 Assets Cash $ 26,591 $ 104,819 Investments in subsidiaries 2,718,821 2,147,396 Other assets 92,520 60,379 Total assets $ 2,837,932 $ 2,312,594 Liabilities and Stockholders’ Equity Short-term borrowings $ 10,000 $ 25,000 Long-term borrowings 14,000 — Junior subordinated notes issued to capital trusts 214,384 186,164 Other liabilities 20,339 14,146 Stockholders’ equity 2,579,209 2,087,284 Total liabilities and stockholders’ equity $ 2,837,932 $ 2,312,594 Statements of Operations (In thousands) Years Ended December 31, 2016 2015 2014 Dividends from subsidiaries $ 112,000 $ 158,000 $ 101,500 Interest and other income 1,913 469 3,097 Interest and other expense 14,990 10,637 14,636 Income before income tax benefit and equity in undistributed net income of subsidiaries 98,923 147,832 89,961 Income tax benefit (5,303 ) (4,018 ) (4,590 ) Income before equity in undistributed net income of subsidiaries 104,226 151,850 94,551 Equity in undistributed net income (loss) of subsidiaries 69,910 7,098 (8,450 ) Net income 174,136 158,948 86,101 Dividends on preferred shares 8,009 8,000 4,000 Net income available to common stockholders $ 166,127 $ 150,948 $ 82,101 Statements of Cash Flows (In thousands) Years Ended December 31, 2016 2015 2014 Cash Flows From Operating Activities Net income $ 174,136 $ 158,948 $ 86,101 Adjustments to reconcile net income to net cash provided by operating activities: Compensation expense for share-based payment plans 16,868 14,123 8,974 Equity in undistributed net income of subsidiaries (69,910 ) (7,098 ) 8,450 Change in other assets and other liabilities (28,546 ) (8,814 ) (8,584 ) Net cash provided by operating activities 92,548 157,159 94,941 Cash Flows From Investing Activities Investments in and advances to subsidiaries (2,000 ) — — Net cash paid in business acquisition (83,163 ) — (101,546 ) Net cash used in investing activities (85,163 ) — (101,546 ) Cash Flows From Financing Activities Treasury stock transactions, net (3,837 ) (53,587 ) (2,690 ) Stock options exercised 1,410 499 1,034 Dividends paid on common stock (58,177 ) (48,413 ) (34,210 ) Dividends paid on preferred stock (8,009 ) (8,000 ) (2,000 ) Net (decrease) increase short-term borrowings (15,000 ) 25,000 — Principal paid on long-term borrowings (2,000 ) — — Redemption of on junior subordinated notes issued to capital trusts — — (45,369 ) Net cash used in financing activities (85,613 ) (84,501 ) (83,235 ) Net (decrease) increase in cash (78,228 ) 72,658 (89,840 ) Cash: Beginning of year 104,819 32,161 122,001 End of year $ 26,591 $ 104,819 $ 32,161

Preferred Stock

Preferred Stock	12 Months Ended
	Dec. 31, 2016
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. On August 24, 2016, in connection with the American Chartered merger, the Company issued one share of its Cumulative Voting Convertible Preferred Stock, Series B ("Company Series B Preferred Stock"), in exchange for each of the 525 shares of American Chartered's Series D Preferred Stock outstanding immediately prior to the merger whose holders did not elect to receive the same consideration in the Merger as holders of American Chartered Common Stock, based on the number of shares of American Chartered Common Stock into which each such share of American Chartered Series D Preferred Stock would otherwise then be convertible. Holders of the Company Series B Preferred Stock are entitled to receive cumulative cash dividends on the liquidation preference amount, which is $1,000 per share, at a rate of 8.00% per annum, have the right to vote on all matters upon which holders of the Company's common stock are entitled to vote and have the right to convert each share into shares of the Company's common stock at any time. During the third quarter of 2016, 400 shares of the Company Series B Preferred stock were converted into shares of the Company's common stock. The Company Series B Preferred stock has a mandatory conversion date of September 20, 2017. The Company Series B Preferred Stock is included in Tier 2 capital for regulatory capital purposes.

Significant Accounting Polici32

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2016
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. A loan rated "one" represents a loan least likely to default, while 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 16 years. The migration data is adjusted by using average losses for an economic cycle (approximately 15 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 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 review this data annually 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 net charge-off rates and the yield on BBB-rated debt. Commercial real estate loans and construction loans: M2 Money stock, our prior period net charge-off rates, the U.S. commercial real estate index and the CBOE Volatility Index. Using the indicators noted above, a predicted net charge-off percentage is calculated. The predicted net charge-off percentage is then compared to the cycle average net 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 net charge-offs to the predicted model net charge-offs, re-run our regression analyses 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	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 Accounting Standards Codification ("ASC") Topic 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 Topic 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 Topic 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 acquired loans which will offset a substantial portion of the accretion from the pass rated loans. In accordance with ASC Topic 310-30, for both purchased non-impaired loans and purchased credit-impaired loans, the difference between contractually required payments at acquisition and the cash flows expected to be collected is referred to as the non-accretable difference. Further, any excess of cash flows expected at acquisition over the estimated fair value is referred to as the accretable yield and is recognized into interest income over the remaining life of the loan when there is a reasonable expectation about the amount and timing of such cash flows. Substantially all of the loans acquired in transactions with the FDIC displayed at least some level of credit deterioration and as such are included as non-impaired and impaired loans as described immediately above.
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 (gain) 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, 2016 , 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.
Preferred stock	Preferred stock: Preferred stock issued in connection with the Taylor Capital Group, Inc. and American Chartered Bancorp, Inc. mergers 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, 2016 , the Company had three reportable operating segments: banking, leasing and mortgage banking.
New authoritative accounting guidance	New authoritative accounting guidance: 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 Company adopted this new authoritative guidance on January 1, 2016, and it did not have an 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 Company adopted this new authoritative guidance on January 1, 2016, and it did not have an 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 statement of operations 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 the acquisition date. The Company adopted this new authoritative guidance on January 1, 2016, and it did not have an impact on the Company's statements of operations or financial condition. New authoritative accounting guidance under ASC Topic 805 "Business Combinations" amends prior guidance to clarify the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The new authoritative guidance will be effective for reporting periods after January 1, 2018. This new authoritative guidance is not expected to have a significant 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 and to provide clarification on identifying performance obligations and licensing implementation guidance. The new authoritative guidance was initially effective for reporting periods after January 1, 2017 but was deferred to January 1, 2018. The Company's revenue is comprised of interest income on financial assets, which is excluded from the scope of this new guidance, and non-interest income. The Company expects this new guidance will require it to change how certain recurring revenue streams are recognized within trust and asset management fees but does not expect these changes to have a significant impact on its statements of operations or financial condition. The Company continues to evaluate the impact of this guidance on other components of non-interest income. The Company expects to adopt this new guidance on January 1, 2018 with a cumulative effect adjustment to opening retained earnings, if such adjustment is deemed to be significant. 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. ASC Topic 405 "Liabilities-Extinguishment of Liabilities." New authoritative accounting guidance under ASC Topic 405, "Liabilities-Extinguishment of Liabilities" amended prior guidance to clarify that liabilities related to the sale of prepaid store-value products within the scope of this guidance are financial liabilities and that breakage for those liabilities are to be accounted for consistent with the breakage guidance in ASC Topic 606 "Revenue from Contracts with Customers." The new authoritative guidance will be effective for reporting periods after 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 842 "Leases." New authoritative accounting guidance under ASC Topic 842 "Leases" amended prior guidance to require lessees to recognize the assets and liabilities arising from all leases on the balance sheet. The new authoritative guidance defines a lease as a contract, or part of a contract, that conveys the right to control the use of identified property, plant, or equipment (an identified asset) for a period of time in exchange for consideration. In addition, the qualifications for a sale and leaseback transaction have been amended. The new authoritative guidance also requires qualitative and quantitative disclosures by lessees and lessors to meet the objective of enabling users of financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases. In transition, lessees and lessors are required to recognize and measure leases at the beginning of the earliest period presented using a modified retrospective approach. The new authoritative guidance will be effective for reporting periods after January 1, 2019. The Company is evaluating the new guidance and its impact on the Company's statements of operations and financial condition. The Company expects an increase in assets and liabilities as a result of recording additional lease contracts where the Company is lessee. ASC Topic 815 "Derivatives and Hedging." New authoritative accounting guidance under ASC Topic 815 "Derivatives and Hedging" amended prior guidance to clarify that a change in the counterparty to a derivative instrument that has been designated as the hedging instrument does not, in and of itself, require dedesignation of that hedging relationship provided that all other hedge accounting criteria continue to be met. An entity has an option to apply the amendments in this new authoritative guidance on either a prospective basis or a modified retrospective basis. The new authoritative guidance will be effective for reporting periods after January 1, 2017 and early adoption is permitted. This new authoritative guidance will not have a significant impact on the Company's statements of operations or financial condition. New authoritative accounting guidance under ASC Topic 815 "Derivatives and Hedging" amended prior guidance to clarify what steps are required when assessing whether the economic characteristics and risks of call (put) options are clearly and closely related to the economic characteristics and risks of their debt hosts, which is one of the criteria for bifurcating an embedded derivative. An entity is required to consider whether (1) the payoff is adjusted based on changes in an index, (2) the payoff is indexed to an underlying other than interest rates or credit risk, (3) the debt involves a substantial premium or discount, and (4) the call (put) option is contingently exercisable. An entity should apply this new authoritative guidance on a modified retrospective basis to existing debt instruments as of the beginning of the fiscal year for which the amendments are effective. The new authoritative guidance will be effective for reporting periods after January 1, 2017 and early adoption is permitted. This new authoritative guidance will not have a significant impact on the Company's statements of operations or financial condition. ASC Topic 323 "Investment - Equity Method and Joint Ventures." New authoritative accounting guidance under ASC Topic 323 "Investment - Equity Method and Joint Ventures" amended prior guidance to eliminate the requirement to retroactively adopt the equity method of accounting as a result of an increase in the level of ownership interest or degree of influence. The new authoritative guidance required that the equity method investor add the cost of acquiring the additional interest in the investee to the current basis of the investor’s previously held interest and adopt the equity method of accounting as of the date the investment becomes qualified for equity method accounting. The new authoritative guidance will be effective for reporting periods after January 1, 2017 and early adoption is permitted. This new authoritative guidance will not have a significant impact on the Company's statements of operations or financial condition. ASC Topic 718 "Compensation - Stock Compensation." New authoritative accounting guidance under ASC Topic 718 "Compensation - Stock Compensation" amended prior guidance on several aspects, including the income tax consequences, classification of awards as either equity or liability, and classification on the statement of cash flows. The new authoritative guidance allows for all excess tax benefits and tax deficiencies to be recognized as income tax benefit or expense in the income statement. The tax effects of exercised or vested awards should be treated as discrete items in the reporting period in which they occur. An entity also should recognize excess tax benefits regardless of whether the benefit reduces taxes payable in the current period. For the statement of cash flows, excess tax benefits should be classified along with other income tax cash flows as an operating activity, and cash paid by an employer when directly withholding shares for tax withholding purposes should be classified as a financing activity. The new authoritative guidance also allows an entity to make an entity-wide accounting policy election to either estimate the number of awards that are expected to vest or account for forfeitures when they occur. In addition, the threshold to qualify for equity classification permits withholding up to the maximum statutory tax rates in the applicable jurisdictions. The new authoritative guidance will be effective for reporting periods after January 1, 2017 and early adoption is permitted. The Company early adopted the new guidance in the third quarter of 2016, and as a result, recorded a $1.8 million tax benefit in the Company's statements of operations. The Company has also elected to account for forfeitures when they occur. ASC Topic 326 "Financial Instruments - Credit Losses." New authoritative accounting guidance under ASC Topic 326 " Financial Instruments - Credit Losses " amended the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information for credit loss estimates. The measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. The new authoritative guidance also requires a financial asset (or a group of financial assets) measured at amortized cost basis to be presented at the net amount expected to be collected (net of the allowance for credit losses). In addition, the credit losses relating to available-for-sale debt securities should be recorded through an allowance for credit losses rather than a write-down. The new authoritative guidance will be effective for reporting periods after January 1, 2020. The Company is evaluating the new guidance and expects it to have an impact on the Company's statements of operations and financial condition, the significance of which is not yet known. ASC Topic 230 "Statement of Cash Flows." New authoritative accounting guidance under ASC Topic 230 "Statement of Cash Flows" addresses eight specific cash flow classification issues with the objective of reducing the existing diversity in practice. The new authoritative guidance will be effective for reporting periods after January 1, 2018. This new authoritative guidance is not expected to have a significant impact on the Company's statements of operations or financial condition. New authoritative accounting guidance under ASC Topic 230 "Statement of Cash Flows" amends prior guidance to require an entity to include amounts generally described as restricted cash and restricted cash equivalents with cash and cash equivalents when reconciling the beginning of period and end of period total amounts shown on the statement of cash flows. The new authoritative guidance will be effective for reporting periods after January 1, 2018. This new authoritative guidance is not expected to have a significant impact on the Company's statements of operations or financial condition. ASC Topic 740 "Income Taxes." New authoritative accounting guidance under ASC Topic 740 "Income Taxes" amends prior guidance to require an entity to recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. The new authoritative guidance will be effective for reporting periods after January 1, 2018. The Company is evaluating the new guidance and its impact on the Company's statements of operations or financial condition. ASC Topic 350 "Intangibles-Goodwill and Other." New authoritative accounting guidance under ASC Topic 350 "Intangibles-Goodwill and Other" amends prior guidance to eliminate Step 2 from the goodwill impairment test and require an entity to perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. Additionally, an entity should consider income tax effects from any tax deductible goodwill on the carrying amount of the reporting unit when measuring the goodwill impairment loss, if applicable. The new authoritative guidance will be effective for reporting periods after January 1, 2020. The Company is evaluating the new guidance and its impact on the Company's statements of operations and 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, 2016
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, 2016 2015 2014 Distributed earnings allocated to common stock $ 59,047 $ 48,813 $ 34,422 Undistributed earnings 115,089 110,135 51,679 Net income 174,136 158,948 86,101 Less: preferred stock dividends 8,009 8,000 4,000 Net income available to common stockholders for basic earnings per common share 166,127 150,948 82,101 Plus: preferred stock dividends on convertible preferred stock 9 — — Less: earnings and dividends allocated to participating securities 7 8 2 Earnings allocated to common stockholders for diluted earnings per common share $ 166,129 $ 150,940 $ 82,099 Weighted average shares outstanding for basic earnings per common share 76,968,823 74,177,574 62,012,196 Dilutive effect of: Stock options 435,976 300,552 247,436 Restricted shares and units 564,418 370,904 313,774 Convertible preferred stock 6,904 — — Total dilutive effect of equity awards and convertible preferred stock 1,007,298 671,456 561,210 Weighted average shares outstanding for diluted earnings per common share 77,976,121 74,849,030 62,573,406 Basic earnings per common share $ 2.16 $ 2.03 $ 1.32 Diluted earnings per common share 2.13 2.02 1.31

Business Combinations (Tables)

Business Combinations (Tables)	12 Months Ended
	Dec. 31, 2016
Taylor Capital Group, Inc.
Business Acquisition [Line Items]
Assets Acquired and Liabilities Assumed	Estimated fair values of the assets acquired and liabilities assumed in the Taylor Capital Merger, 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): Purchased Purchased Non-Credit-Impaired Fair value $ 204,805 $ 3,327,406 Gross contractual amounts receivable 244,650 3,707,463 Best estimate of contractual cash flows not expected to be collected (1) 34,219 302,329 Best estimate of contractual cash flows expected to be collected 210,431 3,405,134 (1) Includes interest payments not expected to be collected due to loan prepayments as well as principal and interest payments not expected to be collected due to customer default.
Business Acquisition, Pro Forma Information	The following table provides the unaudited pro forma information for the results of operations for the year ended December 31, 2014, 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 Year Ended December 31, 2014 (in thousands) Total revenues (net interest income plus non-interest income) $ 774,778 Net income 112,220
American Chartered Bancorp, Inc.
Business Acquisition [Line Items]
Assets Acquired and Liabilities Assumed	Estimated fair values of the assets acquired and liabilities assumed in the American Chartered Merger, as of the closing date of the transaction were as follows (in thousands): August 24, 2016 ASSETS Cash and cash equivalents $ 93,307 Investment securities available for sale 505,564 Non-marketable securities - FRB and FHLB Stock 16,000 Loans 1,940,702 Premises and equipment 39,048 Cash surrender value of life insurance 59,917 Goodwill 275,998 Other intangibles 25,452 Other real estate owned 3,960 Other assets 32,141 Total assets $ 2,992,089 LIABILITIES Deposits $ 2,389,327 Short-term borrowings 48,305 Long-term borrowings 16,000 Junior subordinated notes issued to capital trusts 28,075 Accrued expenses and other liabilities 22,966 Total liabilities $ 2,504,673 Total identifiable net assets $ 487,416 Consideration: Market value of common stock at $39.28 per share at August 24, 2016 (9,744,636 shares of common stock issued) $ 382,769 Series B preferred stock at $2,337.97 per share at August 24, 2016 (525 shares of preferred stock issued) (1) 1,227 Stock-based compensation attributed to pre-business combination service 1,103 Cash paid 102,317 Total fair value of consideration, excluding Series B preferred stock $ 487,416 (1) Per share fair value amount determined as if the shares of Series B were converted into shares common stock.
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): Purchased Purchased Non-Credit-Impaired Fair value $ 51,916 $ 1,888,786 Gross contractual amounts receivable 84,000 2,159,197 Best estimate of contractual cash flows not expected to be collected (1) 23,846 114,660 Best estimate of contractual cash flows expected to be collected 60,154 2,044,537 (1) Includes interest payments not expected to be collected due to loan prepayments as well as principal and interest payments not expected to be collected due to customer default.
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, 2016 and 2015, as if the acquisition had occurred January 1, 2015. The pro forma results combine the historical results of American Chartered into the Company's consolidated statement of operations 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, 2015. 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. Years Ended December 31, 2016 2015 (in thousands) Total revenues (net interest income plus non-interest income) $ 971,846 $ 909,200 Net income 195,335 193,898

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2016
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, 2016 Available for Sale U.S. Government sponsored agencies and enterprises $ 23,267 $ 148 $ — $ 23,415 States and political subdivisions 376,541 15,669 (845 ) 391,365 Residential mortgage-backed securities 988,744 5,741 (10,801 ) 983,684 Commercial mortgage-backed securities 91,949 1,221 (162 ) 93,008 Corporate bonds 193,164 1,426 (695 ) 193,895 Equity securities 11,000 — (172 ) 10,828 Total Available for Sale 1,684,665 24,205 (12,675 ) 1,696,195 Held to Maturity States and political subdivisions 910,608 21,609 (3,039 ) 929,178 Residential mortgage-backed securities 159,142 5,420 — 164,562 Total Held to Maturity 1,069,750 27,029 (3,039 ) 1,093,740 Total $ 2,754,415 $ 51,234 $ (15,714 ) $ 2,789,935 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 Total Available for Sale 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 Total Held to Maturity 1,230,810 44,595 (638 ) 1,274,767 Total $ 2,789,766 $ 78,505 $ (8,481 ) $ 2,859,790
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, 2016 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 $ 42,806 $ (845 ) $ — $ — $ 42,806 $ (845 ) Residential mortgage-backed securities 623,732 (10,084 ) 54,990 (717 ) 678,722 (10,801 ) Commercial mortgage-backed securities 7,062 (9 ) 11,612 (153 ) 18,674 (162 ) Corporate bonds 21,028 (204 ) 20,088 (491 ) 41,116 (695 ) Equity securities 10,828 (172 ) — — 10,828 (172 ) Total Available for Sale 705,456 (11,314 ) 86,690 (1,361 ) 792,146 (12,675 ) Held to Maturity States and political subdivisions 243,568 (2,999 ) 2,988 (40 ) 246,556 (3,039 ) Total $ 949,024 $ (14,313 ) $ 89,678 $ (1,401 ) $ 1,038,702 $ (15,714 ) 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 ) Total Available for Sale 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 ) Total $ 500,346 $ (4,524 ) $ 79,851 $ (3,957 ) $ 580,197 $ (8,481 )
Summary of Realized Gains (Losses) 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, 2016 2015 2014 Realized gains $ 614 $ 1,470 $ 2,045 Realized losses (167 ) (1,646 ) (4,478 ) Impairment charges — — (92 ) Net losses $ 447 $ (176 ) $ (2,525 )
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, 2016 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 $ 67,153 $ 67,424 Due after one year through five years 231,930 235,275 Due after five years through ten years 44,364 44,873 Due after ten years 249,525 261,103 Equity securities 11,000 10,828 Residential and commercial mortgage-backed securities 1,080,693 1,076,692 Total Available for Sale 1,684,665 1,696,195 Held to maturity: Due in one year or less 69,289 69,332 Due after one year through five years 136,426 139,892 Due after five years through ten years 166,101 171,937 Due after ten years 538,792 548,017 Residential mortgage-backed securities 159,142 164,562 Total Held to Maturity 1,069,750 1,093,740 Total $ 2,754,415 $ 2,789,935

Loans (Tables)

Loans (Tables)	12 Months Ended
	Dec. 31, 2016
Receivables [Abstract]
Schedule of Accounts Notes Financing Receivable	Loans consist of the following at (in thousands): December 31, 2016 2015 Commercial $ 4,346,506 $ 3,616,286 Commercial collateralized by assignment of lease payments 2,002,976 1,779,072 Commercial real estate 3,788,016 2,695,676 Residential real estate 1,060,828 628,169 Construction real estate 518,562 252,060 Indirect vehicle 541,680 384,095 Home equity 266,377 216,573 Other consumer 80,781 80,661 Gross loans, excluding purchased credit-impaired loans 12,605,726 9,652,592 Purchased credit-impaired loans 163,077 141,406 Total loans $ 12,768,803 $ 9,793,998
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, 2016 and 2015 (in thousands): Current 30-59 Days 60-89 Days Loans Past Due Total Total December 31, 2016 Commercial $ 4,337,348 $ 2,515 $ 156 $ 6,487 $ 9,158 $ 4,346,506 Commercial collateralized by assignment of lease payments 1,989,934 9,229 1,869 1,944 13,042 2,002,976 Commercial real estate: Healthcare 582,450 — — — — 582,450 Industrial 825,715 3,045 3,293 1,340 7,678 833,393 Multifamily 547,107 458 53 379 890 547,997 Retail 506,789 568 — — 568 507,357 Office 405,992 350 475 6,381 7,206 413,198 Other 899,950 2,385 1,155 131 3,671 903,621 Residential real estate 1,041,189 8,248 3,409 7,982 19,639 1,060,828 Construction real estate 518,171 — 391 — 391 518,562 Indirect vehicle 537,221 2,836 1,062 561 4,459 541,680 Home equity 261,765 1,219 815 2,578 4,612 266,377 Other consumer 80,443 152 120 66 338 80,781 Gross loans, excluding purchased credit-impaired loans 12,534,074 31,005 12,798 27,849 71,652 12,605,726 Purchased credit-impaired loans 86,169 6,546 6,600 63,762 76,908 163,077 Total loans $ 12,620,243 $ 37,551 $ 19,398 $ 91,611 $ 148,560 $ 12,768,803 Non-performing loan aging $ 28,364 $ 2,308 $ 978 $ 27,702 $ 30,988 $ 59,352 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
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, 2016 and 2015 (in thousands): 2016 2015 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 $ 11,222 $ 1,406 $ 24,689 $ 42 Commercial collateralized by assignment of lease payments 1,364 1,197 7,027 5,318 Commercial real estate: Healthcare — — — — Industrial 276 1,064 1,136 — Multifamily 2,662 — 3,415 — Office 896 6,381 4,496 693 Retail 384 — 17,594 — Other 83 21 1,544 195 Residential real estate 16,538 235 17,951 253 Construction real estate — — — — Indirect vehicle 2,355 10 2,046 — Home equity 13,187 — 18,156 — Other consumer 7 64 11 95 Total $ 48,974 $ 10,378 $ 98,065 $ 6,596
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, 2016 and 2015 (in thousands): Pass Special Substandard Doubtful Total December 31, 2016 Commercial $ 4,127,397 $ 113,838 $ 105,271 $ — $ 4,346,506 Commercial collateralized by assignment of lease payments 1,981,689 16,010 5,277 — 2,002,976 Commercial real estate: Healthcare 545,663 32,251 4,536 — 582,450 Industrial 814,668 17,962 763 — 833,393 Multifamily 544,071 312 3,614 — 547,997 Retail 498,458 8,350 549 — 507,357 Office 404,811 5,299 3,088 — 413,198 Other 820,229 44,629 38,763 — 903,621 Construction real estate 518,562 — — — 518,562 Total $ 10,255,548 $ 238,651 $ 161,861 $ — $ 10,656,060 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
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, 2016 and 2015 (in thousands): Performing Non-performing Total December 31, 2016 Residential real estate $ 1,044,055 $ 16,773 $ 1,060,828 Indirect vehicle 539,315 2,365 541,680 Home equity 253,190 13,187 266,377 Other consumer 80,710 71 80,781 Total $ 1,917,270 $ 32,396 $ 1,949,666 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
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, 2016 and 2015 (in thousands): December 31, 2016 Unpaid Recorded Partial Allowance for Average Interest With no related allowance recorded: Commercial $ 9,056 $ 9,056 $ — $ — $ 5,944 $ — Commercial collateralized by assignment of lease payments 1,129 747 382 — 1,045 34 Commercial real estate: Healthcare — — — — — — Industrial — — — — 402 — Multifamily 1,922 1,922 — — 2,348 — Retail 2,670 929 1,741 — 2,165 — Office — — — — 256 — Other — — — — 60 — Residential real estate — — — — — — Construction real estate — — — — — — Indirect vehicle 223 122 101 — 252 — Home equity — — — — 143 — Other consumer — — — — — — With an allowance recorded: Commercial 14,403 14,403 — 2,889 22,737 — Commercial collateralized by assignment of lease payments — — — — 2,397 18 Commercial real estate: Healthcare — — — — — — Industrial — — — — — — Multifamily — — — — — — Retail 3,592 3,592 — 354 6,827 — Office — — — — 745 — Other — — — — 235 — Residential real estate 16,257 14,353 1,904 2,163 13,412 — Construction real estate — — — — — — Indirect vehicle — — — — — — Home equity 31,104 28,790 2,314 2,930 28,677 — Other consumer — — — — — — Total $ 80,356 $ 73,914 $ 6,442 $ 8,336 $ 87,645 $ 52 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
Schedule of Loans That Have Been Restructured Classified as Performing and Non-Performing	The following table presents loans that were restructured during the year ended December 31, 2016 (dollars in thousands): December 31, 2016 Number of Pre-Modification Recorded Post-Modification Recorded Charge-offs and Performing: Commercial 2 $ 4,388 $ 4,388 $ 412 Residential real estate 6 939 939 $ 143 Home equity 13 2,113 2,113 172 Total 21 $ 7,440 $ 7,440 $ 727 Non-Performing: Commercial 8 $ 17,472 $ 17,472 $ 5,784 Commercial collateralized by assignment of lease payments 2 794 794 382 Residential real estate 10 1,310 1,310 245 Indirect vehicle 33 220 220 75 Home equity 42 4,933 4,933 293 Total 95 $ 24,729 $ 24,729 $ 6,779 The following table presents loans that were 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
Troubled Debt Restructuring Activity Rollforward	The following tables present the troubled debt restructurings activity during the year ended December 31, 2016 (dollars in thousands): Performing Non-performing Beginning balance $ 26,991 $ 23,619 Additions 7,440 24,729 Charge-offs — (1,089 ) Principal payments, net (3,287 ) (9,270 ) Removals (1,995 ) (6,611 ) Transfer to other real estate owned — (772 ) Transfers in 4,439 901 Transfers out (901 ) (4,439 ) Ending balance $ 32,687 $ 27,068
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, 2016 (dollars in thousands): December 31, 2016 Extended Maturity, Maturity, Delay Delay in Amortization Extended in Payments and Payments or and Reduction Maturity and/or Reduction of Reduction of of Interest Rate Amortization Amount Interest Rate Total Commercial $ — $ 17,472 $ — $ 4,388 $ 21,860 Commercial collateralized by assignment of lease payments — — 794 — 794 Commercial real estate: Residential real estate 484 712 — 1,053 2,249 Indirect vehicle — — — 220 220 Home equity 3,769 2,030 — 1,247 7,046 Total $ 4,253 $ 20,214 $ 794 $ 6,908 $ 32,169
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, 2016 2015 2014 Balance at beginning of year $ 131,508 $ 114,057 $ 113,462 Allowance for unfunded credit commitments acquired through business combination — — 1,261 Utilization of allowance for unfunded credit commitments — — (637 ) Provision for credit losses 19,563 21,386 12,052 Charge-offs: Commercial 2,126 2,993 1,339 Commercial collateralized by assignment of lease payments 6,740 2,765 925 Commercial real estate 2,851 3,563 11,438 Residential real estate 1,356 1,450 1,718 Construction real estate 593 34 79 Indirect vehicle 3,505 2,980 3,735 Home equity 1,662 1,485 3,383 Other consumer 1,778 1,941 2,128 Total charge-offs 20,611 17,211 24,745 Recoveries: Commercial 2,434 1,749 3,757 Commercial collateralized by assignment of lease payments 550 1,112 939 Commercial real estate 3,729 6,723 4,020 Residential real estate 1,210 515 1,190 Construction real estate 142 272 252 Indirect vehicle 1,837 1,853 1,736 Home equity 756 579 482 Other consumer 724 473 288 Total recoveries 11,382 13,276 12,664 Net charge-offs 9,229 3,935 12,081 Allowance for credit losses 141,842 131,508 114,057 Allowance for unfunded credit commitments (2,476 ) (3,368 ) (4,031 ) Balance at December 31, $ 139,366 $ 128,140 $ 110,026
Allowance Activity for Loan Losses by Portfolio Segment Based on Impairment Method	The following table presents the activity in the allowance for credit losses, balance in allowance for credit losses and recorded investment in loans by portfolio segment and based on impairment method as of December 31, 2016 and 2015 (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, 2016 Allowance for credit losses: Beginning balance $ 39,316 $ 10,434 $ 45,475 $ 5,734 $ 15,113 $ 2,418 $ 7,374 $ 2,276 $ 3,368 $ 131,508 Charge-offs 2,126 6,740 2,851 1,356 593 3,505 1,662 1,778 — 20,611 Recoveries 2,434 550 3,729 1,210 142 1,837 756 724 — 11,382 Provision 5,037 7,994 5,454 383 96 2,671 (999 ) (181 ) (892 ) 19,563 Ending balance $ 44,661 $ 12,238 $ 51,807 $ 5,971 $ 14,758 $ 3,421 $ 5,469 $ 1,041 $ 2,476 $ 141,842 Ending allowance balance attributable to loans: Individually evaluated for impairment $ 2,889 $ — $ 354 $ 2,163 $ — $ — $ 2,930 $ — $ 617 $ 8,953 Collectively evaluated for impairment 41,594 12,238 50,811 3,808 14,712 3,421 2,539 1,041 1,859 132,023 Acquired and accounted for under ASC Topic 310-30 (1) 178 — 642 — 46 — — — — 866 Total ending allowance balance $ 44,661 $ 12,238 $ 51,807 $ 5,971 $ 14,758 $ 3,421 $ 5,469 $ 1,041 $ 2,476 $ 141,842 Loans: Individually evaluated for impairment $ 23,459 $ 747 $ 6,443 $ 14,353 $ — $ 122 $ 28,790 $ — $ — $ 73,914 Collectively evaluated for impairment 4,323,047 2,002,229 3,781,573 1,046,475 518,562 541,558 237,587 80,781 — 12,531,812 Acquired and accounted for under ASC Topic 310-30 (1) 22,257 — 46,994 72,184 4,832 — 14,549 2,261 — 163,077 Total ending loans balance $ 4,368,763 $ 2,002,976 $ 3,835,010 $ 1,133,012 $ 523,394 $ 541,680 $ 280,926 $ 83,042 $ — $ 12,768,803 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 Topic 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 Topic 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 (1) Loans acquired in business combinations and accounted for under ASC Topic 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 Topic 310-30 were as follows for the years ended December 31, 2016 and 2015 (in thousands): Year Ended December 31, 2016 2015 Balance at beginning of period $ 12,596 $ 7,434 Purchases 5,086 — Accretion (9,585 ) (9,637 ) Other (1) 7,953 14,799 Balance at end of period $ 16,050 $ 12,596 (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 Topic 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, 2016 Purchased Purchased Non-Credit-Impaired Total Covered loans: Consumer related $ 16,639 $ — $ 16,639 Non covered loans: Commercial loans $ 22,257 $ 797,759 $ 820,016 Commercial loans collateralized by assignment of lease payments — 104,119 104,119 Commercial real estate 46,994 1,278,702 1,325,696 Construction real estate 4,832 15,336 20,168 Consumer related 6,232 374,260 380,492 Total non-covered loans 80,315 2,570,176 2,650,491 Total acquired $ 96,954 $ 2,570,176 $ 2,667,130

Lease Investments (Tables)

Lease Investments (Tables)	12 Months Ended
	Dec. 31, 2016
Leases [Abstract]
Schedule of Lease Investments by Categories	Lease investments by categories follow (in thousands): December 31, 2016 2015 Direct finance leases: Minimum lease payments $ 433,451 $ 392,901 Estimated unguaranteed residual values 78,256 74,411 Less: unearned income (36,327 ) (34,675 ) Direct finance leases (1) $ 475,380 $ 432,637 Leveraged leases: Minimum lease payments $ 821 $ 3,286 Estimated unguaranteed residual values 108 523 Less: unearned income (25 ) (126 ) Less: related non-recourse debt (803 ) (3,199 ) Leveraged leases (1) $ 101 $ 484 Operating leases: Equipment, at cost $ 440,861 $ 318,843 Less accumulated depreciation (129,534 ) (107,156 ) Lease investments, net $ 311,327 $ 211,687 (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 2017 $ 157,419 $ 642 $ 68,132 $ 226,193 2018 116,334 179 53,383 169,896 2019 76,393 — 38,013 114,406 2020 44,327 — 23,500 67,827 2021 21,723 — 16,157 37,880 Thereafter 17,255 — 21,034 38,289 $ 433,451 $ 821 $ 220,219 $ 654,491
Schedule of Residual Values for Leases by Category in the Year the Initial Lease Term Ends	At December 31, 2016 , 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 2017 $ 17,927 $ 89 $ 13,121 $ 31,137 2018 16,072 19 11,531 27,622 2019 16,776 — 12,662 29,438 2020 11,075 — 15,859 26,934 2021 3,266 — 19,772 23,038 Thereafter 13,140 — 27,055 40,195 $ 78,256 $ 108 $ 100,000 $ 178,364
Income from Lease Investments	Income from lease financing, net was composed of (in thousands): Years Ended December 31, 2016 2015 2014 Rental income $ 69,083 $ 59,668 $ 67,135 Equipment maintenance contracts revenue, net of cost of sales 25,005 23,027 16,441 Vendor promotional income 11,073 8,527 8,382 Other lease related revenue 4,254 5,769 2,356 Gain on sale of lease payments and leased equipment, net of residual write downs 13,241 17,006 9,546 Income on lease investments, gross 122,656 113,997 103,860 Less: depreciation on operating leases (49,170 ) (37,416 ) (39,550 ) Lease financing, net $ 73,486 $ 76,581 $ 64,310

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Schedule of Premises and Equipment	Premises and equipment consisted of (in thousands): December 31, 2016 2015 Land and land improvements $ 81,468 $ 67,089 Buildings 122,268 100,041 Furniture and equipment 182,924 139,648 Buildings and leasehold improvements 76,602 61,383 463,262 368,161 Accumulated depreciation (169,352 ) (132,148 ) Premises and equipment, net $ 293,910 $ 236,013

Goodwill and Intangibles (Table

Goodwill and Intangibles (Tables)	12 Months Ended
	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of the Carrying Amount of Goodwill	The following table presents the changes in the carrying amount of goodwill as of December 31, 2016 and 2015 (in thousands): December 31, 2016 2015 Banking Leasing Mortgage banking Total Banking Leasing Mortgage banking Total Balance at beginning of period $ 684,430 $ 40,640 $ — $ 725,070 $ 670,881 $ 40,640 $ — $ 711,521 Goodwill from business combinations (1) 275,968 — — 275,968 13,549 — — 13,549 Balance at end of period $ 960,398 $ 40,640 $ — $ 1,001,038 $ 684,430 $ 40,640 $ — $ 725,070 (1) Due to the American Chartered merger and adjustments recognized for the MSA acquisition.
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, 2016 and 2015 (in thousands): December 31, 2016 2015 Balance at beginning of period $ 44,812 $ 38,006 Amortization expense (7,305 ) (6,115 ) Other intangibles from business combinations 25,452 12,921 Balance at end of period $ 62,959 $ 44,812 Gross carrying amount $ 112,820 $ 93,292 Accumulated amortization (49,861 ) (48,480 ) Net book value $ 62,959 $ 44,812
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 2017 $ 8,193 2018 7,451 2019 5,674 2020 5,022 2021 4,790 Thereafter 31,829 $ 62,959

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2016
Banking and Thrift [Abstract]
Schedule of Composition of Deposits	The composition of deposits was as follows (in thousands): December 31, 2016 2015 Demand deposit accounts, noninterest bearing $ 6,408,169 $ 4,627,184 NOW and money market accounts 4,543,004 4,144,633 Savings accounts 1,135,992 974,555 Certificates of deposit, $250,000 or more 1,144,121 877,352 Other certificates of deposit 879,162 881,491 Total $ 14,110,448 $ 11,505,215
Schedule of Maturities of Time Certificates	At December 31, 2016 , the scheduled maturities of certificates of deposit were as follows (in thousands): 2017 $ 1,224,620 2018 444,103 2019 147,591 2020 145,410 2021 50,597 Thereafter 10,962 $ 2,023,283

Short-Term Borrowings (Tables)

Short-Term Borrowings (Tables)	12 Months Ended
	Dec. 31, 2016
Debt Disclosure [Abstract]
Summary of Short-Term Borrowings	Short-term borrowings were as follows as of December 31, 2016 and 2015 (dollars in thousands): December 31, 2016 2015 Weighted Average Weighted Average Cost Amount Cost Amount Customer repurchase agreements 0.22 % $ 237,538 0.20 % $ 201,207 Federal Home Loan Bank advances 0.63 1,275,000 0.17 775,000 Federal funds purchased 0.80 46,750 0.09 4,530 Line of credit 2.52 10,000 2.18 25,000 Total 0.59 % $ 1,569,288 0.23 % $ 1,005,737

Long-term Borrowings (Tables)

Long-term Borrowings (Tables)	12 Months Ended
	Dec. 31, 2016
Debt Disclosure [Abstract]
Schedule of Long-term Borrowings	Long-term borrowings were as follows as of December 31, 2016 and 2015 (dollars in thousands): December 31, 2016 2015 Weighted Average Weighted Average Cost Amount Cost Amount Federal Home Loan Bank advances 0.85 % $ 230,865 0.45 % $ 305,239 Notes payable 4.18 66,925 4.30 54,998 Structured repurchase agreement — — 4.75 40,037 Term note 2.52 14,000 — — Total 1.64 % $ 311,790 1.41 % $ 400,274
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, 2017 $ 109,510 2018 174,908 2019 15,562 2020 6,553 2021 1,345 Thereafter 3,912 Total $ 311,790

Junior Subordinated Notes Iss43

Junior Subordinated Notes Issued to Capital Trusts (Tables)	12 Months Ended
	Dec. 31, 2016
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, 2016 (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 American Chartered Statutory Trust I (4) American Chartered Statutory Trust II (4) Junior Subordinated Notes: Principal balance $ 20,619 $ 10,464 Annual interest rate 3-mo LIBOR + 3.60% 3-mo LIBOR + 2.75% Stated maturity date December 18, 2031 October 7, 2034 Call date December 18, 2006 October 7, 2009 Trust Preferred Securities: Face Value $ 20,000 $ 10,000 Annual distribution rate 3-mo LIBOR + 3.60% 3-mo LIBOR + 2.75% Issuance date November 2001 August 2004 Distribution dates (1) 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 $6.8 million as of December 31, 2016 . (4) American Chartered Statutory Trust I and American Chartered Statutory Trust II were established by American Chartered prior to the Company's acquisition of American Chartered in August 2016, and the junior subordinated notes issued by American Chartered to American Chartered Statutory Trust I and American Chartered Statutory Trust II were assumed by the Company upon completion of the acquisition. Principal balance and face value amounts associated with American Chartered Statutory Trust I and American Chartered Statutory Trust II do not include purchase accounting adjustments to such amounts, which in each case resulted in a discount of $6.4 million as of December 31, 2016 .

Lease Commitments and Rental 44

Lease Commitments and Rental Expense (Tables)	12 Months Ended
	Dec. 31, 2016
Leases [Abstract]
Future Minimum Annual Rental Commitments for Noncancelable Leases and Subleases	The Company leases office space for certain branch offices. At December 31, 2016 , 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 2017 $ 11,972 $ 1,384 $ 10,588 2018 10,472 1,252 9,220 2019 9,487 989 8,498 2020 6,067 420 5,647 2021 5,003 175 4,828 Thereafter 22,883 — 22,883 $ 65,884 $ 4,220 $ 61,664

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Schedule of Deferred Tax Assets and Liabilities	The deferred taxes consist of (in thousands): December 31, 2016 2015 Deferred tax asset: Allowance for credit losses $ 55,525 $ 51,256 State net operating loss carryforwards 20,570 22,624 Other real estate owned 9,845 11,165 Stock options and restricted stock 9,675 7,317 Loans 36,770 36,386 Deferred compensation 8,556 8,550 Tax credit carryforwards 32,262 27,904 Bonus accrual 4,877 3,827 Other items 666 1,008 Total deferred tax asset 178,746 170,037 Valuation allowance — — Total deferred tax asset, net of valuation allowance 178,746 170,037 Deferred tax liability: Equipment leasing (152,282 ) (132,159 ) Premises and equipment (25,015 ) (21,371 ) Mortgage servicing rights (76,468 ) (59,369 ) Deferred income from FDIC-assisted transactions (46,443 ) (43,102 ) Investment securities (7,270 ) (2,317 ) FHLB stock dividends (3,221 ) (3,207 ) Core deposit intangible (15,516 ) (7,448 ) Other items (893 ) (3,509 ) Total deferred tax liability (327,108 ) (272,482 ) Net deferred tax liability (148,362 ) (102,445 ) Net unrealized holding gain on investment securities available for sale (3,296 ) (10,137 ) Net deferred tax liability $ (151,658 ) $ (112,582 )
Schedule of Income Taxes Attributable to Continuing Operations	Income taxes attributable to continuing operations consist of (in thousands): Years Ended December 31, 2016 2015 2014 Current expense (benefit): Federal $ 26,081 $ 30,283 $ 25,270 State 7,204 3,355 11,971 Foreign 42 — — 33,327 33,638 37,241 Deferred expense (benefit): Federal 37,690 28,765 3,122 State 8,227 10,808 (3,170 ) Foreign — — — 45,917 39,573 (48 ) $ 79,244 $ 73,211 $ 37,193
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, 2016 2015 2014 Federal income tax expense at expected statutory rate $ 88,683 $ 81,256 $ 43,153 Increase (decrease) due to: Tax exempt income, net (18,214 ) (16,909 ) (14,848 ) State tax expense net of federal impact 10,030 9,205 5,721 Non-deductible contingent consideration 1,026 158 3,738 Non-includable increase in cash surrender value of life insurance (1,432 ) (1,191 ) (1,120 ) Non-deductible merger expense 298 360 988 Adjustment of tax contingency reserves 1 (969 ) (31 ) Other items, net (1,148 ) 1,301 (408 ) Income tax expense $ 79,244 $ 73,211 $ 37,193
Schedule of Reconciliation of the Change in Unrecognized Tax Benefits	A reconciliation of the change in unrecognized tax benefits from January 1, 2016 to December 31, 2016 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, 2016 $ 17 $ 2 $ 19 Increases for tax positions of prior years — 1 1 Balance at December 31, 2016 $ 17 $ 3 $ 20

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Schedule of Outstanding Financial Instruments, Contractual Amounts of Off-Balance Sheet Credit Risk	At December 31, 2016 and 2015 , the following financial instruments were outstanding, the contractual amounts of which represent off-balance sheet credit risk (in thousands): Contractual Amount 2016 2015 Commitments to extend credit: Home equity lines $ 235,279 $ 187,478 Other commitments 3,679,259 3,049,152 Letters of credit: Standby 185,386 137,945 Commercial 1,766 1,108

Regulatory Matters (Tables)

Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2016
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, 2016 Total capital (to risk-weighted assets): Consolidated $ 1,878,106 11.63 % $ 1,292,159 8.00 % N/A N/A MB Financial Bank 1,812,202 11.26 1,287,099 8.00 $ 1,608,874 10.00 % Tier 1 capital (to risk-weighted assets): Consolidated $ 1,518,472 9.40 % 969,119 6.00 % N/A N/A MB Financial Bank 1,670,360 10.38 965,324 6.00 1,287,099 8.00 % Common equity tier 1 capital (to risk-weighted assets): Consolidated $ 1,408,481 8.72 % 726,839 4.50 % N/A N/A MB Financial Bank 1,670,360 10.38 723,993 4.50 1,045,768 6.50 % Tier 1 capital (to average assets): Consolidated $ 1,518,472 8.38 % 724,519 4.00 % N/A N/A MB Financial Bank 1,670,360 9.25 721,954 4.00 902,442 5.00 % 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 % N/A — not applicable

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2016
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, 2016 and 2015 , 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) 2016 Financial assets Securities available for sale: U.S. Government sponsored agencies and enterprises $ 23,415 $ — $ 23,415 $ — States and political subdivisions 391,365 — 390,992 373 Residential mortgage-backed securities 983,684 — 983,513 171 Commercial mortgage-backed securities 93,008 — 93,008 — Corporate bonds 193,895 — 193,895 — Equity securities 10,828 10,828 — — Loans held for sale 716,883 — 716,883 — Loans 16,273 — 16,273 — Mortgage servicing rights 238,011 — — 238,011 Assets held in trust for deferred compensation 18,723 18,723 — — Derivative financial instruments 44,586 7,687 33,739 3,160 Financial liabilities Other liabilities (1) 18,723 18,723 — — Derivative financial instruments 63,885 2,046 61,839 — 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 — (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, 2016 Valuation Technique Unobservable Input Range (in thousands) States and political subdivisions $ 373 Discounted cash flows Credit assumption 50% Loss Residential mortgage-backed securities 171 Discounted cash flows Constant pre-payment rates (CPR) 1% - 3% Mortgage servicing rights 238,011 Discounted cash flows CPR 7.0% - 8.3% Discount rate 9.50 - 12.00 Maturity (months) 323 - 357 Delinquencies 0.51 - 3.87 Costs to service $ 66 - $ 226 Additive delinquent costs to service $ 175 - $ 1,000 Derivative financial instruments (mortgage 3,160 Sales cash flows Expected closing ratio 70% - 95% interest rate lock commitments) Expected delivery price 97.13 bps - 108.85 bps The following table presents additional information about the unobservable inputs used in the fair value measurement of financial and non-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, 2016 Technique Unobservable Input Range Impaired loans $ 54,576 Appraisal of collateral Appraisal adjustments - sales costs 5% - 10% Foreclosed assets 31,607 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, 2016 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, 2016 Weighted average prepayment speed (CPR) 7.50 % Impact on fair value of 10% adverse change $ (7,409 ) Impact on fair value of 20% adverse change (14,415 ) Weighted average discount rate 9.80 % Impact on fair value of 10% adverse change $ (10,159 ) Impact on fair value of 20% adverse change (19,521 ) Weighted average delinquency rate 2.14 % Impact on fair value of 10% adverse change $ (2,393 ) Impact on fair value of 20% adverse change (4,248 ) Weighted average costs to service $ 90 Impact on fair value of 10% adverse change (4,546 ) Impact on fair value of 20% adverse change (9,093 )
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, 2016 2015 2016 2015 2016 2015 Investment Securities Mortgage Servicing Rights Derivatives Balance, beginning of period $ 773 $ 973 $ 168,162 $ 235,402 $ 3,822 $ 5,074 Acquired through business combination — — — — 146 — Purchases — — 5,087 823 — — Originations — — 68,428 68,690 — — Included in earnings — — (3,666 ) (33,648 ) (808 ) (1,252 ) Principal payments (229 ) (200 ) — — — — Sales — — — (103,105 ) — — Balance, ending of period $ 544 $ 773 $ 238,011 $ 168,162 $ 3,160 $ 3,822
Assets Measured at Fair Value on a Nonrecurring Basis	Assets measured at fair value on a nonrecurring basis as of December 31, 2016 and 2015 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) 2016 Financial assets: Impaired loans $ 54,576 $ — $ — $ 54,576 Non-financial assets: Foreclosed assets 31,607 — — 31,607 2015 Financial assets: Impaired loans $ 76,203 $ — $ — $ 76,203 Non-financial assets: Foreclosed assets 42,351 — — 42,351
Estimated Fair Values of Financial Instruments	The estimated fair values of financial instruments are as follows (in thousands): December 31, 2016 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 $ 364,783 $ 364,783 $ 364,783 $ — $ — Interest bearing deposits with banks 98,686 98,686 98,686 — — Investment securities available for sale 1,696,195 1,696,195 10,828 1,684,823 544 Investment securities held to maturity 1,069,750 1,093,740 — 1,093,740 — Non-marketable securities - FHLB and FRB stock 143,276 143,276 — — 143,276 Loans held for sale 716,883 716,883 — 716,883 — Loans, net 12,629,437 12,747,107 — 16,273 12,730,834 Accrued interest receivable 59,024 59,024 59,024 — — Derivative financial instruments 44,586 44,586 7,687 33,739 3,160 Financial Liabilities: Non-interest bearing deposits $ 6,408,169 $ 6,408,169 $ 6,408,169 $ — $ — Interest bearing deposits 7,702,279 7,698,839 — — 7,698,839 Short-term borrowings 1,569,288 1,569,314 — — 1,569,314 Long-term borrowings 311,790 317,028 — — 317,028 Junior subordinated notes issued to capital trusts 210,668 157,098 — — 157,098 Accrued interest payable 4,288 4,288 4,288 — — Derivative financial instruments 63,885 63,885 2,046 61,839 — 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 —

Stock Incentive Plans (Tables)

Stock Incentive Plans (Tables)	12 Months Ended
	Dec. 31, 2016
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, 2016 2015 2014 Total compensation expense for share-based payment plans during the year $ 16,868 $ 14,123 $ 8,974 Amount of related income tax benefit recognized in income 8,983 5,515 3,528
Additional Information Related to Options Outstanding	The following table summarizes stock options outstanding for the year ended December 31, 2016 : 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, 2015 2,192,431 $ 27.77 4.44 Granted 405,678 31.74 Assumed (1) 107,344 19.74 Exercised (692,790 ) 28.96 Expired (36,341 ) 39.65 Forfeited or cancelled (35,917 ) 31.03 Options outstanding as of December 31, 2016 1,940,405 $ 27.45 5.31 $ 38,382 Options exercisable as of December 31, 2016 1,230,520 $ 26.43 3.55 $ 25,591
Assumptions Used for Options Granted	The following assumptions were used for options granted during the years ended December 31, 2016 , 2015 , and 2014 : For the Years Ended December 31, 2016 2015 2014 Risk-free interest rate 1.44 % 1.68 % 1.82 % Expected volatility of Company’s stock 28.08 % 29.66 % 23.16 % Expected dividend yield 2.19 % 1.82 % 1.65 % Expected life of options (years) 5.5 5.7 5.5 Weighted average fair value per option of options granted during the year $ 6.66 $ 7.77 $ 5.93
Summary of Changes in Restricted Shares	The following is a summary of changes in restricted shares and units for the year ended December 31, 2016 : Number of Shares Weighted Average Grant Date Fair Value Shares and Units Outstanding at December 31, 2015 945,506 $ 29.92 Granted 483,467 31.24 Assumed (1) 5,191 32.45 Vested (409,550 ) 28.40 Forfeited or cancelled (25,807 ) 29.99 Shares and Units Outstanding at December 31, 2016 998,807 31.20

Derivative Financial Instrume50

Derivative Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2016
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, 2016 and 2015 (in thousands): Asset Derivatives Liability Derivatives December 31, 2016 December 31, 2015 December 31, 2016 December 31, 2015 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) $ — $ — $ — $ — $ 107 $ (4 ) $ 154 $ (9 ) Stand-alone derivative instruments: (2) Interest rate swap contracts 1,310,057 25,471 1,034,298 27,856 1,310,057 (25,471 ) 1,025,186 (27,899 ) Interest rate options contracts 217,546 881 222,585 628 217,546 (881 ) 190,622 (585 ) Foreign exchange contracts 40,641 4,429 72,529 3,970 40,505 (4,265 ) 63,339 (3,671 ) Spot foreign exchange contracts 1,691 12 328 5 660 (5 ) 132 — Mortgage banking derivatives: Interest rate swap contracts 383,000 2,946 898,000 4,928 1,458,000 (31,212 ) 665,000 (3,723 ) Treasury futures contracts 15,500 41 — — — — — — TBA mortgage securities — — 35,000 33 55,000 (132 ) — — Forward loan sale commitments 585,000 7,646 503,500 1,604 386,000 (1,915 ) 475,500 (1,087 ) Interest rate lock commitments 543,901 3,160 622,906 3,822 — — — — Total non-hedging derivative instruments 3,097,336 44,586 3,389,146 42,846 3,467,768 (63,881 ) 2,419,779 (36,965 ) Total $ 3,097,336 $ 44,586 $ 3,389,146 $ 42,846 $ 3,467,875 $ (63,885 ) $ 2,419,933 $ (36,974 ) (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, 2016 2015 2014 Derivative instruments designated as hedges of fair value: Interest rate swap contracts $ 5 $ 6 $ 8 Stand-alone derivative instruments: Interest rate swap contracts 7,571 404 2,458 Interest rate options contracts 36 43 — Foreign exchange contracts 970 149 96 Spot foreign exchange contracts 963 18 (14 ) Mortgage related derivatives (1,509 ) (13,100 ) (965 ) Total non-hedging derivative instruments 8,031 (12,486 ) 1,575 Total $ 8,036 $ (12,480 ) $ 1,583
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, 2016 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 $ 7,885 $ — $ 7,885 $ 18,564 $ — $ 18,564 Foreign currency forward contracts 4,315 — 4,315 1,674 — 1,674 Mortgage banking derivatives 10,633 — 10,633 33,259 — 33,259 Total derivatives 22,833 — 22,833 53,497 — 53,497 Repurchase agreements — — — 237,538 — 237,538 Total $ 22,833 $ — $ 22,833 $ 291,035 $ — $ 291,035 Financial Assets Financial Liabilities Net Amount Recognized Financial Instruments Collateral Net Amount Net Amount Recognized Financial Instruments Collateral Net Amount Derivatives: Counterparty A $ 2,697 $ (2,697 ) $ — $ — $ 18,768 $ (2,697 ) $ (16,071 ) $ — Counterparty B 4,683 (4,683 ) — — 12,881 (4,683 ) (8,198 ) — Counterparty C 64 (64 ) — — 4,919 (64 ) (4,855 ) — Other counterparties 15,389 (10,938 ) — 4,451 16,929 (10,938 ) (5,980 ) 11 Total derivatives 22,833 (18,382 ) — 4,451 53,497 (18,382 ) (35,104 ) 11 Repurchase agreements — — — — 237,538 — (237,538 ) — Total $ 22,833 $ (18,382 ) $ — $ 4,451 $ 291,035 $ (18,382 ) $ (272,642 ) $ 11 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

Operating Segments (Tables)

Operating Segments (Tables)	12 Months Ended
	Dec. 31, 2016
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, By Segment	Banking Leasing Mortgage Banking Consolidated Year ended December 31, 2016 Net interest income $ 475,133 $ 9,415 $ 33,343 $ 517,891 Provision for credit losses 18,583 295 685 19,563 Non-interest income 153,250 73,503 148,150 374,903 Non-interest expense (1) 421,733 48,450 149,668 619,851 Income tax expense 53,263 13,525 12,456 79,244 Net income $ 134,804 $ 20,648 $ 18,684 $ 174,136 Total assets $ 16,368,881 $ 1,224,169 $ 1,709,267 $ 19,302,317 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 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 (1) Includes merger related expenses of $23.7 million , $5.5 million and $45.4 million in the banking segment for the years ended December 31, 2016, 2015 and 2014, respectively. Also, includes contingent consideration expense related to our acquisition of Celtic Leasing Corp. in the banking segment for the year ended December 31, 2016 and 2014.

Condensed Parent Company Fina52

Condensed Parent Company Financial Information (Tables)	12 Months Ended
	Dec. 31, 2016
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Balance Sheets	Balance Sheets (In thousands) December 31, 2016 2015 Assets Cash $ 26,591 $ 104,819 Investments in subsidiaries 2,718,821 2,147,396 Other assets 92,520 60,379 Total assets $ 2,837,932 $ 2,312,594 Liabilities and Stockholders’ Equity Short-term borrowings $ 10,000 $ 25,000 Long-term borrowings 14,000 — Junior subordinated notes issued to capital trusts 214,384 186,164 Other liabilities 20,339 14,146 Stockholders’ equity 2,579,209 2,087,284 Total liabilities and stockholders’ equity $ 2,837,932 $ 2,312,594
Condensed Statements of Operations	Statements of Operations (In thousands) Years Ended December 31, 2016 2015 2014 Dividends from subsidiaries $ 112,000 $ 158,000 $ 101,500 Interest and other income 1,913 469 3,097 Interest and other expense 14,990 10,637 14,636 Income before income tax benefit and equity in undistributed net income of subsidiaries 98,923 147,832 89,961 Income tax benefit (5,303 ) (4,018 ) (4,590 ) Income before equity in undistributed net income of subsidiaries 104,226 151,850 94,551 Equity in undistributed net income (loss) of subsidiaries 69,910 7,098 (8,450 ) Net income 174,136 158,948 86,101 Dividends on preferred shares 8,009 8,000 4,000 Net income available to common stockholders $ 166,127 $ 150,948 $ 82,101
Condensed Statements of Cash Flows	Statements of Cash Flows (In thousands) Years Ended December 31, 2016 2015 2014 Cash Flows From Operating Activities Net income $ 174,136 $ 158,948 $ 86,101 Adjustments to reconcile net income to net cash provided by operating activities: Compensation expense for share-based payment plans 16,868 14,123 8,974 Equity in undistributed net income of subsidiaries (69,910 ) (7,098 ) 8,450 Change in other assets and other liabilities (28,546 ) (8,814 ) (8,584 ) Net cash provided by operating activities 92,548 157,159 94,941 Cash Flows From Investing Activities Investments in and advances to subsidiaries (2,000 ) — — Net cash paid in business acquisition (83,163 ) — (101,546 ) Net cash used in investing activities (85,163 ) — (101,546 ) Cash Flows From Financing Activities Treasury stock transactions, net (3,837 ) (53,587 ) (2,690 ) Stock options exercised 1,410 499 1,034 Dividends paid on common stock (58,177 ) (48,413 ) (34,210 ) Dividends paid on preferred stock (8,009 ) (8,000 ) (2,000 ) Net (decrease) increase short-term borrowings (15,000 ) 25,000 — Principal paid on long-term borrowings (2,000 ) — — Redemption of on junior subordinated notes issued to capital trusts — — (45,369 ) Net cash used in financing activities (85,613 ) (84,501 ) (83,235 ) Net (decrease) increase in cash (78,228 ) 72,658 (89,840 ) Cash: Beginning of year 104,819 32,161 122,001 End of year $ 26,591 $ 104,819 $ 32,161

Significant Accounting Polici53

Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2016Subsidiaryelementeconomic_variableofficenotecategory
Troubled debt restructurings:
Number of notes into which a note is restructured (in instruments) | note	2
Loans:
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)	16 years
Period for computing average losses (in years)	15 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
Loans:
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	95

Significant Accounting Polici54

Significant Accounting Policies (Details 2)	12 Months Ended
	Dec. 31, 2016
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	3 Months Ended	12 Months Ended
	Sep. 30, 2016USD ($)	Dec. 31, 2016$ / shares	Dec. 31, 2016segment	Dec. 31, 2016reporting_unit	Dec. 31, 2016shares	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)$ / sharesshares	Dec. 31, 2014USD ($)$ / sharesshares
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income						$ 174,136	$ 158,948	$ 86,101
Less: preferred stock dividends						8,009	8,000	4,000
Net income available to common stockholders						166,127	150,948	82,101
Plus: preferred stock dividends on convertible preferred stock						9	0	0
Less: earnings and dividends allocated to participating securities						7	8	2
Earnings allocated to common stockholders for diluted earnings per common share						166,129	$ 150,940	$ 82,099
Weighted average shares outstanding for basic earnings per common share (in shares) | shares					76,968,823		74,177,574	62,012,196
Dilutive effect of:
Dilutive effect of stock options and restricted shares and units | shares					1,007,298		671,456	561,210
Convertible preferred stock | shares					6,904		0	0
Weighted average shares outstanding for diluted earnings per common share (in shares) | shares					77,976,121		74,849,030	62,573,406
Basic earnings per common share (in dollars per share) | $ / shares		$ 2.16					$ 2.03	$ 1.32
Diluted earnings per common share (in dollars per share) | $ / shares		$ 2.13					$ 2.02	$ 1.31
Segment Reporting
Number of reportable segments			3	3
Stock options
Dilutive effect of:
Dilutive effect of stock options and restricted shares and units | shares					435,976		300,552	247,436
Restricted stock
Dilutive effect of:
Dilutive effect of stock options and restricted shares and units | shares					564,418		370,904	313,774
Common Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Distributed earnings allocated to common stock						59,047	$ 48,813	$ 34,422
Undistributed earnings						115,089	110,135	51,679
Net income						174,136	158,948	86,101
Net income available to common stockholders						$ 166,127	$ 150,948	$ 82,101
Weighted average shares outstanding for basic earnings per common share (in shares) | shares					76,968,823		74,177,574	62,012,196
Dilutive effect of:
Weighted average shares outstanding for diluted earnings per common share (in shares) | shares					77,976,121		74,849,030	62,573,406
Accounting Standards Update 2016-09 | New Accounting Pronouncement, Early Adoption, Effect
New authoritative accounting guidance
Excess tax benefit	$ 1,800

Business Combinations (Details)

Business Combinations (Details) - USD ($)	Aug. 24, 2016	Nov. 20, 2015	Aug. 18, 2014	Aug. 15, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Goodwill					$ 1,001,038,000	$ 725,070,000	$ 711,521,000
Accretable discounts for non-purchased credit-impaired loans					$ 29,211,000	$ 36,651,000	21,262,000
Series A Preferred Stock
Business Acquisition [Line Items]
Preferred stock, dividend rate (percent)					8.00%	8.00%
Series B Preferred Stock
Business Acquisition [Line Items]
Preferred stock, dividend rate (percent)					8.00%
Taylor Capital Group, Inc. | Series A Preferred Stock
Business Acquisition [Line Items]
Number of securities called by each warrant or right (in shares)			1
American Chartered Bancorp, Inc.
Business Acquisition [Line Items]
Amount called by each warrant or right		$ 9.30
Amount paid for each fractional share (in dollars per share)		$ 39.01
American Chartered Bancorp, Inc. | Series B Preferred Stock
Business Acquisition [Line Items]
Number of securities called by each warrant or right (in shares)	1
Common Stock | American Chartered Bancorp, Inc.
Business Acquisition [Line Items]
Number of securities called by each warrant or right (in shares)		0.2732
Taylor Capital Group, Inc.
Business Acquisition [Line Items]
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							$ 34,800,000	$ 2,500,000
Core deposit intangible			20,079,000
Market value of common stock and Series B preferred stock			519,270,000
Taylor Capital Group, Inc. | Series A Preferred Stock
Business Acquisition [Line Items]
Preferred stock, dividend rate (percent)					8.00%
Taylor Capital Group, Inc. | Restricted stock
Business Acquisition [Line Items]
Cash paid			$ 3,700,000
Taylor Capital Group, Inc. | Common Stock
Business Acquisition [Line Items]
Number of securities called by each warrant or right (in shares)			0.64318
Business acquisition, shares of common stock issued (in shares)			19,600,000	19,602,482
MSA Holdings, LLC
Business Acquisition [Line Items]
Goodwill						$ 13,500,000
Percentage of equity interest acquired						100.00%
Core deposit intangible						$ 8,800,000
American Chartered Bancorp, Inc.
Business Acquisition [Line Items]
Cash paid	$ 102,317,000
Goodwill	275,998,000
Business combination, merger expenses					$ 2,000,000
Core deposit intangible	25,452,000
Identifiable net assets	487,416,000
Preferred stock and stock-based awards assumed	2,300,000
Decrease to fair value estimate of loans	12,100,000
Increase to deferred tax assets	4,700,000
Increase to goodwill	7,200,000
American Chartered Bancorp, Inc. | Purchased credit-impaired loans
Business Acquisition [Line Items]
Non-accretable difference	20,000,000
Accretable discount	5,100,000
American Chartered Bancorp, Inc. | Substandard
Business Acquisition [Line Items]
Accretable discounts for non-purchased credit-impaired loans	$ 21,100,000

Business Combinations (Details

Business Combinations (Details 2) - USD ($) $ / shares in Units, $ in Thousands	Aug. 18, 2014	Aug. 15, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
ASSETS
Goodwill			$ 1,001,038	$ 725,070	$ 711,521
LIABILITIES
Series A preferred stock at $28.82 per share at August 15, 2014			$ 115,572	$ 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 or Series B 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 (in dollars per share)		$ 26.49
Business acquisition, shares of common stock issued (in shares)	19,600,000	19,602,482

Business Combinations (Detail58

Business Combinations (Details 3) - Taylor Capital Group, Inc. $ in Thousands	Aug. 24, 2016USD ($)
Purchased credit-impaired loans
Business Acquisition [Line Items]
Fair value	$ 204,805
Gross contractual amounts receivable	244,650
Best estimate of contractual cash flows not expected to be collected	34,219	[1]
Best estimate of contractual cash flows expected to be collected	210,431
Purchased Non-Credit-Impaired Loans
Business Acquisition [Line Items]
Fair value	3,327,406
Gross contractual amounts receivable	3,707,463
Best estimate of contractual cash flows not expected to be collected	302,329	[1]
Best estimate of contractual cash flows expected to be collected	$ 3,405,134
[1]	Includes interest payments not expected to be collected due to loan prepayments as well as principal and interest payments not expected to be collected due to customer default.

Business Combinations (Detail59

Business Combinations (Details 4) - Taylor Capital Group, Inc. $ in Thousands	12 Months Ended
	Dec. 31, 2014USD ($)
Business Acquisition [Line Items]
Total revenues (net interest income plus non-interest income)	$ 774,778
Net income	$ 112,220

Business Combinations (Detail60

Business Combinations (Details 5) - USD ($) $ / shares in Units, $ in Thousands		Aug. 24, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
ASSETS
Goodwill			$ 1,001,038	$ 725,070	$ 711,521
American Chartered Bancorp, Inc.
ASSETS
Cash and cash equivalents		$ 93,307
Investment securities available for sale		505,564
Non-marketable securities - FRB and FHLB Stock		16,000
Loans		1,940,702
Premises and equipment		39,048
Cash surrender value of life insurance		59,917
Goodwill		275,998
Other intangibles		25,452
Other real estate owned		3,960
Other assets		32,141
Total assets		2,992,089
LIABILITIES
Deposits		2,389,327
Short-term borrowings		48,305
Long-term borrowings and junior subordinated notes issued to capital trusts		16,000
Accrued expenses and other liabilities		22,966
Total liabilities		2,504,673
Total identifiable net assets		487,416
Consideration:
Stock-based compensation attributed to pre-business combination service		1,103
Cash paid		102,317
Total fair value of consideration, excluding Series A or Series B preferred stock		487,416
American Chartered Bancorp, Inc. | Common Stock
Consideration:
Market value of common stock and Series B preferred stock		$ 382,769
Stock issued (in dollars per share)		$ 39.28
Stock issued (in shares)		9,744,636
American Chartered Bancorp, Inc. | Preferred Stock | Series B Preferred Stock
Consideration:
Market value of common stock and Series B preferred stock	[1]	$ 1,227
Stock issued (in dollars per share)	[1]	$ 2,337.97
Stock issued (in shares)	[1]	525
American Chartered Bancorp, Inc. | Junior Subordinated Notes
LIABILITIES
Long-term borrowings and junior subordinated notes issued to capital trusts		$ 28,075
[1]	Per share fair value amount determined as if the shares of Series B were converted into shares common stock.

Business Combinations (Detail61

Business Combinations (Details 6) - American Chartered Bancorp, Inc. $ in Thousands	Aug. 24, 2016USD ($)
Purchased credit-impaired loans
Business Acquisition [Line Items]
Fair value	$ 51,916
Gross contractual amounts receivable	84,000
Best estimate of contractual cash flows not expected to be collected	23,846	[1]
Best estimate of contractual cash flows expected to be collected	60,154
Purchased Non-Credit-Impaired Loans
Business Acquisition [Line Items]
Fair value	1,888,786
Gross contractual amounts receivable	2,159,197
Best estimate of contractual cash flows not expected to be collected	114,660	[1]
Best estimate of contractual cash flows expected to be collected	$ 2,044,537
[1]	Includes interest payments not expected to be collected due to loan prepayments as well as principal and interest payments not expected to be collected due to customer default.

Business Combinations (Detail62

Business Combinations (Details 7) - American Chartered Bancorp, Inc. - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Total revenues (net interest income plus non-interest income)	$ 971,846	$ 909,200
Net income	$ 195,335	$ 193,898

Restrictions on Cash and Due 63

Restrictions on Cash and Due From Banks (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Cash and Cash Equivalents [Abstract]
Required reserve balances in cash or on deposits with Federal Reserve Bank	$ 204.8	$ 148

Investment Securities (Details)

Investment Securities (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Available for Sale
Amortized Cost		$ 1,684,665	$ 1,558,956
Gross Unrealized Gains		24,205	33,910
Gross Unrealized Losses		(12,675)	(7,843)
Fair Value		1,696,195	1,585,023
Held to Maturity
Amortized Cost		1,069,750	1,230,810
Gross Unrealized Gains		27,029	44,595
Gross Unrealized Losses		(3,039)	(638)
Fair Value		1,093,740	1,274,767
Total
Amortized Cost		2,754,415	2,789,766
Gross Unrealized Gains		51,234	78,505
Gross Unrealized Losses		(15,714)	(8,481)
Fair Value		2,789,935	2,859,790
Transfer of investment securities held to maturity to investment securities available for sale		0	0	$ 273,471
U.S. Government sponsored agencies and enterprises
Available for Sale
Amortized Cost		23,267	63,805
Gross Unrealized Gains		148	806
Gross Unrealized Losses		0	0
Fair Value		23,415	64,611
States and political subdivisions
Available for Sale
Amortized Cost		376,541	373,285
Gross Unrealized Gains		15,669	23,083
Gross Unrealized Losses		(845)	(1)
Fair Value		391,365	396,367
Held to Maturity
Amortized Cost		910,608	1,016,519
Gross Unrealized Gains		21,609	36,874
Gross Unrealized Losses		(3,039)	(638)
Fair Value		$ 929,178	1,052,755
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	273,500
Held-to-maturity securities, realized loss	3,200
Residential mortgage-backed securities
Available for Sale
Amortized Cost		$ 988,744	759,816
Gross Unrealized Gains		5,741	7,363
Gross Unrealized Losses		(10,801)	(3,630)
Fair Value		983,684	763,549
Held to Maturity
Amortized Cost		159,142	214,291
Gross Unrealized Gains		5,420	7,721
Gross Unrealized Losses		0	0
Fair Value		164,562	222,012
Commercial mortgage-backed securities
Available for Sale
Amortized Cost		91,949	128,509
Gross Unrealized Gains		1,221	1,839
Gross Unrealized Losses		(162)	(241)
Fair Value		93,008	130,107
Corporate bonds
Available for Sale
Amortized Cost		193,164	222,784
Gross Unrealized Gains		1,426	815
Gross Unrealized Losses		(695)	(3,971)
Fair Value		193,895	219,628
Equity securities
Available for Sale
Amortized Cost		11,000	10,757
Gross Unrealized Gains		0	4
Gross Unrealized Losses		(172)	0
Fair Value		$ 10,828	$ 10,761
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, 2016USD ($)Security_Position	Dec. 31, 2015USD ($)Security_Position
Available for Sale
Less Than 12 Months, Fair Value	$ 705,456	$ 434,194
Less Than 12 Months, Unrealized Losses	(11,314)	(4,005)
12 Months or More, Fair Value	86,690	73,661
12 Months or More, Unrealized Losses	(1,361)	(3,838)
Total Fair Value	792,146	507,855
Total Unrealized Losses	(12,675)	(7,843)
Total
Less Than 12 Months, Fair Value	949,024	500,346
Less Than 12 Months, Unrealized Losses	(14,313)	(4,524)
12 Months or More, Fair Value	89,678	79,851
12 Months or More, Unrealized Losses	(1,401)	(3,957)
Total Fair Value	1,038,702	580,197
Total Unrealized Losses	$ (15,714)	$ (8,481)
Number of security positions in the investment portfolio in an unrealized loss position | Security_Position	615	193
States and political subdivisions
Available for Sale
Less Than 12 Months, Fair Value	$ 42,806	$ 219
Less Than 12 Months, Unrealized Losses	(845)	(1)
12 Months or More, Fair Value	0	0
12 Months or More, Unrealized Losses	0	0
Total Fair Value	42,806	219
Total Unrealized Losses	(845)	(1)
Held to Maturity
Less Than 12 Months, Fair Value	243,568	66,152
Less than 12 Months, Unrealized Losses	(2,999)	(519)
12 Months or More, Fair Value	2,988	6,190
12 Months or More, Unrealized Losses	(40)	(119)
Total Fair Value	246,556	72,342
Total Unrealized Losses	(3,039)	(638)
Residential mortgage-backed securities
Available for Sale
Less Than 12 Months, Fair Value	623,732	357,877
Less Than 12 Months, Unrealized Losses	(10,084)	(2,835)
12 Months or More, Fair Value	54,990	43,566
12 Months or More, Unrealized Losses	(717)	(795)
Total Fair Value	678,722	401,443
Total Unrealized Losses	(10,801)	(3,630)
Commercial mortgage-backed securities
Available for Sale
Less Than 12 Months, Fair Value	7,062	2,324
Less Than 12 Months, Unrealized Losses	(9)	(5)
12 Months or More, Fair Value	11,612	11,809
12 Months or More, Unrealized Losses	(153)	(236)
Total Fair Value	18,674	14,133
Total Unrealized Losses	(162)	(241)
Corporate bonds
Available for Sale
Less Than 12 Months, Fair Value	21,028	73,774
Less Than 12 Months, Unrealized Losses	(204)	(1,164)
12 Months or More, Fair Value	20,088	18,286
12 Months or More, Unrealized Losses	(491)	(2,807)
Total Fair Value	41,116	92,060
Total Unrealized Losses	(695)	$ (3,971)
Equity securities
Available for Sale
Less Than 12 Months, Fair Value	10,828
Less Than 12 Months, Unrealized Losses	(172)
12 Months or More, Fair Value	0
12 Months or More, Unrealized Losses	0
Total Fair Value	10,828
Total Unrealized Losses	$ (172)

Investment Securities (Detail66

Investment Securities (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Realized gains	$ 614	$ 1,470	$ 2,045
Realized losses	(167)	(1,646)	(4,478)
Impairment charges	0	0	(92)
Net losses	$ 447	$ (176)	$ (2,525)

Investment Securities (Detail67

Investment Securities (Details 4) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Amortized Cost, Available for sale
Due in one year or less	$ 67,153,000
Due after one year through five years	231,930,000
Due after five years through ten years	44,364,000
Due after ten years	249,525,000
Amortized Cost	1,684,665,000	$ 1,558,956,000
Fair Value, Available for sale
Due in one year or less	67,424,000
Due after one year through five years	235,275,000
Due after five years through ten years	44,873,000
Due after ten years	261,103,000
Fair Value	1,696,195,000	1,585,023,000
Amortized Cost, Held to maturity
Due in one year or less	69,289,000
Due after one year through five years	136,426,000
Due after five years through ten years	166,101,000
Due after ten years	538,792,000
Investment securities held to maturity	1,069,750,000	1,230,810,000
Fair value, Held to maturity
Due in one year or less	69,332,000
Due after one year through five years	139,892,000
Due after five years through ten years	171,937,000
Due after ten years	548,017,000
Fair Value	1,093,740,000	1,274,767,000
Total
Amortized Cost	2,754,415,000	2,789,766,000
Fair Value	2,789,935,000	2,859,790,000
Investment securities	1,000,000,000	1,400,000,000
Securities required to be pledged	756,500,000	878,200,000
Investment securities pledged as collateral for Federal Home Loan Bank advances	0	108,800,000
Equity securities
Amortized Cost, Available for sale
Amortized Cost	11,000,000	10,757,000
Fair Value, Available for sale
Fair Value	10,828,000	10,761,000
Residential and commercial mortgage-backed securities
Amortized Cost, Available for sale
Amortized Cost	1,080,693,000
Fair Value, Available for sale
Fair Value	1,076,692,000
Residential mortgage-backed securities
Amortized Cost, Available for sale
Amortized Cost	988,744,000	759,816,000
Fair Value, Available for sale
Fair Value	983,684,000	763,549,000
Amortized Cost, Held to maturity
Investment securities held to maturity	159,142,000	214,291,000
Fair value, Held to maturity
Fair Value	$ 164,562,000	$ 222,012,000

Loans (Details)

Loans (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)category	Dec. 31, 2015USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans, excluding purchased credit-impaired loans	$ 12,605,726	$ 9,652,592
Purchased credit impaired loans	163,077	141,406
Total loans	$ 12,768,803	9,793,998
Number of highest rating categories by rating services company | category	1
Number of highest rating categories to be achieved for classification as investment grade companies | category	4
Loans and leases receivable related parties	$ 72,200	75,000
Loans and leases receivable related parties additions	30,100
Loans and leases receivable related parties collections	$ 32,200
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	$ 5,500,000	3,200,000
Amount required to be pledged	3,200,000	2,200,000
Commercial Real Estate Portfolio Segment | Commercial real estate and residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans, excluding purchased credit-impaired loans	3,788,016	2,695,676
Total loans	3,835,010	2,732,038
Commercial Real Estate Portfolio Segment | Construction real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans, excluding purchased credit-impaired loans	518,562	252,060
Total loans	523,394	262,951
Consumer Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	12,768,803	9,793,998
Consumer Portfolio Segment | Commercial real estate and residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans, excluding purchased credit-impaired loans	1,060,828	628,169
Total loans	1,133,012	681,325
Consumer Portfolio Segment | Indirect vehicle
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans, excluding purchased credit-impaired loans	541,680	384,095
Total loans	541,680	384,095
Consumer Portfolio Segment | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans, excluding purchased credit-impaired loans	266,377	216,573
Total loans	280,926	230,577
Consumer Portfolio Segment | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans, excluding purchased credit-impaired loans	80,781	80,661
Total loans	83,042	83,370
Uncollateralized | Commercial Portfolio Segment | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans, excluding purchased credit-impaired loans	4,346,506	3,616,286
Total loans	4,368,763	3,640,570
Collateralized | Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,002,976	1,779,072
Collateralized | Commercial Portfolio Segment | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans, excluding purchased credit-impaired loans	$ 2,002,976	$ 1,779,072

Loans (Details 2)

Loans (Details 2) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, excluding purchased credit impaired loans	$ 12,605,726	$ 9,652,592
Total loans	12,768,803	9,793,998
Non-performing loan aging
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	28,364	44,290
Past Due	30,988	60,371
Total loans	59,352	104,661
30-59 Days Past Due | Non-performing loan aging
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	2,308	9,827
60-89 Days Past Due | Non-performing loan aging
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	978	9,367
Loans Past Due 90 Days or More | Non-performing loan aging
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	27,702	41,177
Gross loans, excluding purchased credit-impaired loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	12,534,074	9,550,663
Past Due	71,652	101,929
Total loans, excluding purchased credit impaired loans	12,605,726	9,652,592
Gross loans, excluding purchased credit-impaired loans | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	31,005	43,152
Gross loans, excluding purchased credit-impaired loans | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	12,798	17,489
Gross loans, excluding purchased credit-impaired loans | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	27,849	41,288
Purchased credit-impaired loans | Purchased credit-impaired loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	86,169	81,250
Past Due	76,908	60,156
Total loans	163,077	141,406
Purchased credit-impaired loans | 30-59 Days Past Due | Purchased credit-impaired loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	6,546	3,311
Purchased credit-impaired loans | 60-89 Days Past Due | Purchased credit-impaired loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	6,600	4,439
Purchased credit-impaired loans | Loans Past Due 90 Days or More | Purchased credit-impaired loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	63,762	52,406
Total loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	12,620,243	9,631,913
Past Due	148,560	162,085
Total loans	12,768,803	9,793,998
Total loans | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	37,551	46,463
Total loans | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	19,398	21,928
Total loans | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	91,611	93,694
Commercial Real Estate Portfolio Segment | Healthcare
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	582,450	476,939
Past Due	0	0
Total loans, excluding purchased credit impaired loans	582,450	476,939
Commercial Real Estate Portfolio Segment | Healthcare | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Commercial Real Estate Portfolio Segment | Healthcare | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Commercial Real Estate Portfolio Segment | Healthcare | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Commercial Real Estate Portfolio Segment | Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	825,715	400,182
Past Due	7,678	757
Total loans, excluding purchased credit impaired loans	833,393	400,939
Commercial Real Estate Portfolio Segment | Industrial | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	3,045	0
Commercial Real Estate Portfolio Segment | Industrial | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	3,293	0
Commercial Real Estate Portfolio Segment | Industrial | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,340	757
Commercial Real Estate Portfolio Segment | Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	547,107	399,333
Past Due	890	1,644
Total loans, excluding purchased credit impaired loans	547,997	400,977
Commercial Real Estate Portfolio Segment | Multifamily | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	458	622
Commercial Real Estate Portfolio Segment | Multifamily | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	53	88
Commercial Real Estate Portfolio Segment | Multifamily | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	379	934
Commercial Real Estate Portfolio Segment | Retail
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	506,789	410,958
Past Due	568	13,780
Total loans, excluding purchased credit impaired loans	507,357	424,738
Commercial Real Estate Portfolio Segment | Retail | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	568	6,189
Commercial Real Estate Portfolio Segment | Retail | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	7,411
Commercial Real Estate Portfolio Segment | Retail | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	180
Commercial Real Estate Portfolio Segment | Office
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	405,992	223,935
Past Due	7,206	5,247
Total loans, excluding purchased credit impaired loans	413,198	229,182
Commercial Real Estate Portfolio Segment | Office | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	350	58
Commercial Real Estate Portfolio Segment | Office | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	475	0
Commercial Real Estate Portfolio Segment | Office | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	6,381	5,189
Commercial Real Estate Portfolio Segment | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	899,950	760,530
Past Due	3,671	2,371
Total loans, excluding purchased credit impaired loans	903,621	762,901
Commercial Real Estate Portfolio Segment | Other | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	2,385	622
Commercial Real Estate Portfolio Segment | Other | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,155	82
Commercial Real Estate Portfolio Segment | Other | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	131	1,667
Commercial Real Estate Portfolio Segment | Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, excluding purchased credit impaired loans	3,788,016	2,695,676
Total loans	3,835,010	2,732,038
Commercial Real Estate Portfolio Segment | Construction real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	518,171	252,060
Past Due	391	0
Total loans, excluding purchased credit impaired loans	518,562	252,060
Total loans	523,394	262,951
Commercial Real Estate Portfolio Segment | Construction real estate | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Commercial Real Estate Portfolio Segment | Construction real estate | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	391	0
Commercial Real Estate Portfolio Segment | Construction real estate | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Consumer Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	12,768,803	9,793,998
Consumer Portfolio Segment | Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,041,189	612,573
Past Due	19,639	15,596
Total loans, excluding purchased credit impaired loans	1,060,828	628,169
Total loans	1,133,012	681,325
Consumer Portfolio Segment | Residential real estate | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	8,248	5,193
Consumer Portfolio Segment | Residential real estate | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	3,409	1,729
Consumer Portfolio Segment | Residential real estate | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	7,982	8,674
Consumer Portfolio Segment | Indirect vehicle
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	537,221	380,899
Past Due	4,459	3,196
Total loans, excluding purchased credit impaired loans	541,680	384,095
Total loans	541,680	384,095
Consumer Portfolio Segment | Indirect vehicle | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	2,836	2,085
Consumer Portfolio Segment | Indirect vehicle | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,062	698
Consumer Portfolio Segment | Indirect vehicle | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	561	413
Consumer Portfolio Segment | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	261,765	207,818
Past Due	4,612	8,755
Total loans, excluding purchased credit impaired loans	266,377	216,573
Total loans	280,926	230,577
Consumer Portfolio Segment | Home equity | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,219	1,774
Consumer Portfolio Segment | Home equity | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	815	1,398
Consumer Portfolio Segment | Home equity | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	2,578	5,583
Consumer Portfolio Segment | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	80,443	80,225
Past Due	338	436
Total loans, excluding purchased credit impaired loans	80,781	80,661
Total loans	83,042	83,370
Consumer Portfolio Segment | Other consumer | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	152	254
Consumer Portfolio Segment | Other consumer | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	120	84
Consumer Portfolio Segment | Other consumer | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	66	98
Uncollateralized | Commercial Portfolio Segment | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	4,337,348	3,586,372
Past Due	9,158	29,914
Total loans, excluding purchased credit impaired loans	4,346,506	3,616,286
Total loans	4,368,763	3,640,570
Uncollateralized | Commercial Portfolio Segment | Commercial | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	2,515	22,956
Uncollateralized | Commercial Portfolio Segment | Commercial | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	156	97
Uncollateralized | Commercial Portfolio Segment | Commercial | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	6,487	6,861
Collateralized | Commercial Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	2,002,976	1,779,072
Collateralized | Commercial Portfolio Segment | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,989,934	1,758,839
Past Due	13,042	20,233
Total loans, excluding purchased credit impaired loans	2,002,976	1,779,072
Collateralized | Commercial Portfolio Segment | Commercial | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	9,229	3,399
Collateralized | Commercial Portfolio Segment | Commercial | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,869	5,902
Collateralized | Commercial Portfolio Segment | Commercial | Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	$ 1,944	$ 10,932

Loans (Details 3)

Loans (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable Recorded Investment Non Accrual and Past Due [Abstract]
Reduction in interest income associated with loans on nonaccrual status	$ 3,000	$ 3,700	$ 4,300
Total loans
Financing Receivable Recorded Investment Non Accrual and Past Due [Abstract]
Nonaccrual	48,974	98,065
Loans past due 90 days or more and still accruing	10,378	6,596
Commercial Real Estate Portfolio Segment | 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
Commercial Real Estate Portfolio Segment | Industrial
Financing Receivable Recorded Investment Non Accrual and Past Due [Abstract]
Nonaccrual	276	1,136
Loans past due 90 days or more and still accruing	1,064	0
Commercial Real Estate Portfolio Segment | Multifamily
Financing Receivable Recorded Investment Non Accrual and Past Due [Abstract]
Nonaccrual	2,662	3,415
Loans past due 90 days or more and still accruing	0	0
Commercial Real Estate Portfolio Segment | Office
Financing Receivable Recorded Investment Non Accrual and Past Due [Abstract]
Nonaccrual	896	4,496
Loans past due 90 days or more and still accruing	6,381	693
Commercial Real Estate Portfolio Segment | Retail
Financing Receivable Recorded Investment Non Accrual and Past Due [Abstract]
Nonaccrual	384	17,594
Loans past due 90 days or more and still accruing	0	0
Commercial Real Estate Portfolio Segment | Other
Financing Receivable Recorded Investment Non Accrual and Past Due [Abstract]
Nonaccrual	83	1,544
Loans past due 90 days or more and still accruing	21	195
Commercial Real Estate Portfolio Segment | Construction real estate
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
Consumer Portfolio Segment | Residential real estate
Financing Receivable Recorded Investment Non Accrual and Past Due [Abstract]
Nonaccrual	16,538	17,951
Loans past due 90 days or more and still accruing	235	253
Consumer Portfolio Segment | Indirect vehicle
Financing Receivable Recorded Investment Non Accrual and Past Due [Abstract]
Nonaccrual	2,355	2,046
Loans past due 90 days or more and still accruing	10	0
Consumer Portfolio Segment | Home equity
Financing Receivable Recorded Investment Non Accrual and Past Due [Abstract]
Nonaccrual	13,187	18,156
Loans past due 90 days or more and still accruing	0	0
Consumer Portfolio Segment | Other consumer
Financing Receivable Recorded Investment Non Accrual and Past Due [Abstract]
Nonaccrual	7	11
Loans past due 90 days or more and still accruing	64	95
Uncollateralized | Commercial Portfolio Segment | Commercial
Financing Receivable Recorded Investment Non Accrual and Past Due [Abstract]
Nonaccrual	11,222	24,689
Loans past due 90 days or more and still accruing	1,406	42
Collateralized | Commercial Portfolio Segment | Commercial
Financing Receivable Recorded Investment Non Accrual and Past Due [Abstract]
Nonaccrual	1,364	7,027
Loans past due 90 days or more and still accruing	$ 1,197	$ 5,318

Loans (Details 4)

Loans (Details 4) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	$ 10,656,060	$ 8,343,094
Non-performing substandard and doubtful loans	17,300	59,600
Pass
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	10,255,548	7,976,433
Special Mention
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	238,651	167,161
Substandard
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	161,861	199,500
Doubtful
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	0	0
Commercial Real Estate Portfolio Segment | Healthcare
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	582,450	476,939
Commercial Real Estate Portfolio Segment | Healthcare | Pass
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	545,663	472,599
Commercial Real Estate Portfolio Segment | Healthcare | Special Mention
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	32,251	4,340
Commercial Real Estate Portfolio Segment | Healthcare | Substandard
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	4,536	0
Commercial Real Estate Portfolio Segment | Healthcare | Doubtful
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	0	0
Commercial Real Estate Portfolio Segment | Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	833,393	400,939
Commercial Real Estate Portfolio Segment | Industrial | Pass
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	814,668	380,200
Commercial Real Estate Portfolio Segment | Industrial | Special Mention
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	17,962	19,011
Commercial Real Estate Portfolio Segment | Industrial | Substandard
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	763	1,728
Commercial Real Estate Portfolio Segment | Industrial | Doubtful
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	0	0
Commercial Real Estate Portfolio Segment | Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	547,997	400,977
Commercial Real Estate Portfolio Segment | Multifamily | Pass
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	544,071	396,117
Commercial Real Estate Portfolio Segment | Multifamily | Special Mention
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	312	595
Commercial Real Estate Portfolio Segment | Multifamily | Substandard
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	3,614	4,265
Commercial Real Estate Portfolio Segment | Multifamily | Doubtful
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	0	0
Commercial Real Estate Portfolio Segment | Retail
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	507,357	424,738
Commercial Real Estate Portfolio Segment | Retail | Pass
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	498,458	393,543
Commercial Real Estate Portfolio Segment | Retail | Special Mention
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	8,350	13,310
Commercial Real Estate Portfolio Segment | Retail | Substandard
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	549	17,885
Commercial Real Estate Portfolio Segment | Retail | Doubtful
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	0	0
Commercial Real Estate Portfolio Segment | Office
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	413,198	229,182
Commercial Real Estate Portfolio Segment | Office | Pass
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	404,811	216,584
Commercial Real Estate Portfolio Segment | Office | Special Mention
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	5,299	3,797
Commercial Real Estate Portfolio Segment | Office | Substandard
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	3,088	8,801
Commercial Real Estate Portfolio Segment | Office | Doubtful
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	0	0
Commercial Real Estate Portfolio Segment | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	903,621	762,901
Commercial Real Estate Portfolio Segment | Other | Pass
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	820,229	730,713
Commercial Real Estate Portfolio Segment | Other | Special Mention
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	44,629	6,193
Commercial Real Estate Portfolio Segment | Other | Substandard
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	38,763	25,995
Commercial Real Estate Portfolio Segment | Other | Doubtful
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	0	0
Commercial Real Estate Portfolio Segment | Construction real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	518,562	252,060
Commercial Real Estate Portfolio Segment | Construction real estate | Pass
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	518,562	252,060
Commercial Real Estate Portfolio Segment | Construction real estate | Special Mention
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	0	0
Commercial Real Estate Portfolio Segment | Construction real estate | Substandard
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	0	0
Commercial Real Estate Portfolio Segment | Construction real estate | Doubtful
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	0	0
Uncollateralized | Commercial Portfolio Segment | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	4,346,506	3,616,286
Uncollateralized | Commercial Portfolio Segment | Commercial | Pass
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	4,127,397	3,373,943
Uncollateralized | Commercial Portfolio Segment | Commercial | Special Mention
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	113,838	115,548
Uncollateralized | Commercial Portfolio Segment | Commercial | Substandard
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	105,271	126,795
Uncollateralized | Commercial Portfolio Segment | Commercial | Doubtful
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	0	0
Collateralized | Commercial Portfolio Segment | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	2,002,976	1,779,072
Collateralized | Commercial Portfolio Segment | Commercial | Pass
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	1,981,689	1,760,674
Collateralized | Commercial Portfolio Segment | Commercial | Special Mention
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	16,010	4,367
Collateralized | Commercial Portfolio Segment | Commercial | Substandard
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	5,277	14,031
Collateralized | Commercial Portfolio Segment | Commercial | Doubtful
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, excluding purchased credit-impaired loans	$ 0	$ 0

Loans (Details 5)

Loans (Details 5) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, excluding purchased credit-impaired loans	$ 10,656,060	$ 8,343,094
Amount of mortgage loans in process of foreclosure	29,100	20,800
Consumer Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, excluding purchased credit-impaired loans	1,949,666	1,309,498
Consumer Portfolio Segment | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, excluding purchased credit-impaired loans	1,917,270	1,270,986
Consumer Portfolio Segment | Non-performing loan aging
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, excluding purchased credit-impaired loans	32,396	38,512
Consumer Portfolio Segment | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, excluding purchased credit-impaired loans	1,060,828	628,169
Consumer Portfolio Segment | Residential real estate | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, excluding purchased credit-impaired loans	1,044,055	609,965
Consumer Portfolio Segment | Residential real estate | Non-performing loan aging
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, excluding purchased credit-impaired loans	16,773	18,204
Consumer Portfolio Segment | Indirect vehicle
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, excluding purchased credit-impaired loans	541,680	384,095
Consumer Portfolio Segment | Indirect vehicle | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, excluding purchased credit-impaired loans	539,315	382,049
Consumer Portfolio Segment | Indirect vehicle | Non-performing loan aging
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, excluding purchased credit-impaired loans	2,365	2,046
Consumer Portfolio Segment | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, excluding purchased credit-impaired loans	266,377	216,573
Consumer Portfolio Segment | Home equity | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, excluding purchased credit-impaired loans	253,190	198,417
Consumer Portfolio Segment | Home equity | Non-performing loan aging
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, excluding purchased credit-impaired loans	13,187	18,156
Consumer Portfolio Segment | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, excluding purchased credit-impaired loans	80,781	80,661
Consumer Portfolio Segment | Other consumer | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, excluding purchased credit-impaired loans	80,710	80,555
Consumer Portfolio Segment | Other consumer | Non-performing loan aging
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, excluding purchased credit-impaired loans	$ 71	$ 106

Loans (Details 6)

Loans (Details 6) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	$ 80,356	$ 117,644
Recorded Investment	73,914	114,465
Partial Charge-offs	6,442	3,179
Allowance for Loan and Lease Losses Allocated	8,336	21,937
Average Recorded Investment	87,645	108,854	$ 126,700
Interest Income Recognized	52	202
Interest income recognized on cash basis	52	202	$ 407
Performing
Loans individually evaluated for impairment by class of loans
Restructured loans	32,687	26,991
Non-performing loan aging
Loans individually evaluated for impairment by class of loans
Restructured loans	27,068	23,619
Commercial Real Estate Portfolio Segment | Healthcare | Impaired financing receivable with no allowance
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
Commercial Real Estate Portfolio Segment | Healthcare | Impaired financing receivable with allowance
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
Commercial Real Estate Portfolio Segment | Industrial | Impaired financing receivable with no allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	0	820
Recorded Investment	0	757
Partial Charge-offs	0	63
Allowance for Loan and Lease Losses Allocated	0	0
Average Recorded Investment	402	3,467
Interest Income Recognized	0	0
Commercial Real Estate Portfolio Segment | Industrial | Impaired financing receivable with allowance
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	228
Interest Income Recognized	0	0
Commercial Real Estate Portfolio Segment | Multifamily | Impaired financing receivable with no allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	1,922	575
Recorded Investment	1,922	575
Partial Charge-offs	0	0
Allowance for Loan and Lease Losses Allocated	0	0
Average Recorded Investment	2,348	1,540
Interest Income Recognized	0	17
Commercial Real Estate Portfolio Segment | Multifamily | Impaired financing receivable with allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	0	2,155
Recorded Investment	0	2,155
Partial Charge-offs	0	0
Allowance for Loan and Lease Losses Allocated	0	17
Average Recorded Investment	0	3,307
Interest Income Recognized	0	27
Commercial Real Estate Portfolio Segment | Retail | Impaired financing receivable with no allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	2,670	7,872
Recorded Investment	929	6,131
Partial Charge-offs	1,741	1,741
Allowance for Loan and Lease Losses Allocated	0	0
Average Recorded Investment	2,165	2,768
Interest Income Recognized	0	0
Commercial Real Estate Portfolio Segment | Retail | Impaired financing receivable with allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	3,592	16,034
Recorded Investment	3,592	16,034
Partial Charge-offs	0	0
Allowance for Loan and Lease Losses Allocated	354	4,926
Average Recorded Investment	6,827	8,885
Interest Income Recognized	0	0
Commercial Real Estate Portfolio Segment | Office | Impaired financing receivable with no allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	0	1,608
Recorded Investment	0	1,031
Partial Charge-offs	0	577
Allowance for Loan and Lease Losses Allocated	0	0
Average Recorded Investment	256	1,663
Interest Income Recognized	0	0
Commercial Real Estate Portfolio Segment | Office | Impaired financing receivable with allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	0	2,929
Recorded Investment	0	2,929
Partial Charge-offs	0	0
Allowance for Loan and Lease Losses Allocated	0	1,717
Average Recorded Investment	745	2,457
Interest Income Recognized	0	0
Commercial Real Estate Portfolio Segment | Other | Impaired financing receivable with no allowance
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	60	965
Interest Income Recognized	0	0
Commercial Real Estate Portfolio Segment | Other | Impaired financing receivable with allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	0	592
Recorded Investment	0	592
Partial Charge-offs	0	0
Allowance for Loan and Lease Losses Allocated	0	199
Average Recorded Investment	235	9,629
Interest Income Recognized	0	0
Commercial Real Estate Portfolio Segment | Construction real estate | Impaired financing receivable with no allowance
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
Commercial Real Estate Portfolio Segment | Construction real estate | Impaired financing receivable with allowance
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	214
Interest Income Recognized	0	0
Consumer Portfolio Segment | Residential real estate | Impaired financing receivable with no allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	0	970
Recorded Investment	0	970
Partial Charge-offs	0	0
Allowance for Loan and Lease Losses Allocated	0	0
Average Recorded Investment	0	717
Interest Income Recognized	0	0
Consumer Portfolio Segment | Residential real estate | Impaired financing receivable with allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	16,257	12,950
Recorded Investment	14,353	12,769
Partial Charge-offs	1,904	181
Allowance for Loan and Lease Losses Allocated	2,163	2,634
Average Recorded Investment	13,412	13,484
Interest Income Recognized	0	0
Consumer Portfolio Segment | Indirect vehicle | Impaired financing receivable with no allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	223	0
Recorded Investment	122	0
Partial Charge-offs	101	0
Allowance for Loan and Lease Losses Allocated	0	0
Average Recorded Investment	252	0
Interest Income Recognized	0	0
Consumer Portfolio Segment | Indirect vehicle | Impaired financing receivable with allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	0	119
Recorded Investment	0	119
Partial Charge-offs	0	0
Allowance for Loan and Lease Losses Allocated	0	0
Average Recorded Investment	0	287
Interest Income Recognized	0	0
Consumer Portfolio Segment | Home equity | Impaired financing receivable with no allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	0	927
Recorded Investment	0	927
Partial Charge-offs	0	0
Allowance for Loan and Lease Losses Allocated	0	0
Average Recorded Investment	143	1,000
Interest Income Recognized	0	0
Consumer Portfolio Segment | Home equity | Impaired financing receivable with allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	31,104	28,696
Recorded Investment	28,790	28,583
Partial Charge-offs	2,314	113
Allowance for Loan and Lease Losses Allocated	2,930	3,131
Average Recorded Investment	28,677	27,747
Interest Income Recognized	0	0
Consumer Portfolio Segment | Consumer related | Impaired financing receivable with no allowance
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
Consumer Portfolio Segment | Consumer related | Impaired financing receivable with allowance
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
Uncollateralized | Commercial Portfolio Segment | Commercial | Impaired financing receivable with no allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	9,056	11,253
Recorded Investment	9,056	11,253
Partial Charge-offs	0	0
Allowance for Loan and Lease Losses Allocated	0	0
Average Recorded Investment	5,944	6,628
Interest Income Recognized	0	0
Uncollateralized | Commercial Portfolio Segment | Commercial | Impaired financing receivable with allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	14,403	23,394
Recorded Investment	14,403	23,394
Partial Charge-offs	0	0
Allowance for Loan and Lease Losses Allocated	2,889	7,523
Average Recorded Investment	22,737	18,820
Interest Income Recognized	0	0
Collateralized | Commercial Portfolio Segment | Commercial | Impaired financing receivable with no allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	1,129	3,453
Recorded Investment	747	2,949
Partial Charge-offs	382	504
Allowance for Loan and Lease Losses Allocated	0	0
Average Recorded Investment	1,045	1,035
Interest Income Recognized	34	54
Collateralized | Commercial Portfolio Segment | Commercial | Impaired financing receivable with allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	0	3,297
Recorded Investment	0	3,297
Partial Charge-offs	0	0
Allowance for Loan and Lease Losses Allocated	0	1,790
Average Recorded Investment	2,397	4,013
Interest Income Recognized	$ 18	$ 104

Loans (Details 7)

Loans (Details 7) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)noteloan	Dec. 31, 2015USD ($)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
Number of A/B structures represented by restructured loans | loan	1	1
Restructured loans representing A/B structures	$ 929	$ 1,000
Redefaulted loans	$ 224
Period past due of recorded redefaulted loans (in days)	90 days
Performing
Restructured loans
Number of Loans | loan	21	23
Pre-Modification Recorded Investment	$ 7,440	$ 15,883
Post-Modification Recorded Investment	7,440	15,883
Charge-offs and Specific Reserves	727	2,810
Troubled Debt Restructuring Activity [Roll Forward]
Beginning balance	26,991
Additions	7,440
Charge-offs	0
Principal payments, net	(3,287)
Removals	(1,995)
Transfer to other real estate owned	0
Transfers in	4,439
Transfers out	(901)
Ending balance	$ 32,687	$ 26,991
Non-performing loan aging
Restructured loans
Number of Loans | loan	95	37
Pre-Modification Recorded Investment	$ 24,729	$ 4,750
Post-Modification Recorded Investment	24,729	4,750
Charge-offs and Specific Reserves	6,779	555
Troubled Debt Restructuring Activity [Roll Forward]
Beginning balance	23,619
Additions	24,729
Charge-offs	(1,089)
Principal payments, net	(9,270)
Removals	(6,611)
Transfer to other real estate owned	(772)
Transfers in	901
Transfers out	(4,439)
Ending balance	$ 27,068	$ 23,619
Commercial Portfolio Segment | 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 Real Estate Portfolio Segment | Non-performing loan aging
Restructured loans
Charge-offs and Specific Reserves		$ 0
Commercial Real Estate Portfolio Segment | 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
Commercial Real Estate Portfolio Segment | Multifamily | Non-performing loan aging
Restructured loans
Number of Loans | loan		1
Pre-Modification Recorded Investment		$ 334
Post-Modification Recorded Investment		$ 334
Commercial Real Estate Portfolio Segment | 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
Commercial Real Estate Portfolio Segment | Residential real estate | Non-performing loan aging
Restructured loans
Number of Loans | loan		1
Pre-Modification Recorded Investment		$ 140
Post-Modification Recorded Investment		140
Charge-offs and Specific Reserves		$ 17
Consumer Portfolio Segment | Home equity | Performing
Restructured loans
Number of Loans | loan	13	17
Pre-Modification Recorded Investment	$ 2,113	$ 4,809
Post-Modification Recorded Investment	2,113	4,809
Charge-offs and Specific Reserves	$ 172	$ 0
Consumer Portfolio Segment | Home equity | Non-performing loan aging
Restructured loans
Number of Loans | loan	42	17
Pre-Modification Recorded Investment	$ 4,933	$ 2,959
Post-Modification Recorded Investment	4,933	2,959
Charge-offs and Specific Reserves	$ 293	$ 306
Consumer Portfolio Segment | Residential real estate | Performing
Restructured loans
Number of Loans | loan	6
Pre-Modification Recorded Investment	$ 939
Post-Modification Recorded Investment	939
Charge-offs and Specific Reserves	$ 143
Consumer Portfolio Segment | Residential real estate | Non-performing loan aging
Restructured loans
Number of Loans | loan	10
Pre-Modification Recorded Investment	$ 1,310
Post-Modification Recorded Investment	1,310
Charge-offs and Specific Reserves	$ 245
Consumer Portfolio Segment | Indirect vehicle | Non-performing loan aging
Restructured loans
Number of Loans | loan	33	16
Pre-Modification Recorded Investment	$ 220	$ 88
Post-Modification Recorded Investment	220	88
Charge-offs and Specific Reserves	$ 75	$ 32
Uncollateralized | Commercial Portfolio Segment | Commercial | Performing
Restructured loans
Number of Loans | loan	2
Pre-Modification Recorded Investment	$ 4,388
Post-Modification Recorded Investment	4,388
Charge-offs and Specific Reserves	$ 412
Uncollateralized | Commercial Portfolio Segment | Commercial | Non-performing loan aging
Restructured loans
Number of Loans | loan	8
Pre-Modification Recorded Investment	$ 17,472
Post-Modification Recorded Investment	17,472
Charge-offs and Specific Reserves	$ 5,784
Collateralized | Commercial Portfolio Segment | Commercial | Non-performing loan aging
Restructured loans
Number of Loans | loan	2
Pre-Modification Recorded Investment	$ 794
Post-Modification Recorded Investment	794
Charge-offs and Specific Reserves	$ 382

Loans (Details 8)

Loans (Details 8) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]
Post-modification recorded investment	$ 32,169
Residential real estate | Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Post-modification recorded investment	2,249
Indirect vehicle | Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Post-modification recorded investment	220
Home equity | Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Post-modification recorded investment	7,046
Uncollateralized | Commercial | Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Post-modification recorded investment	21,860
Collateralized | Commercial | Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Post-modification recorded investment	794
Extended Maturity, Amortization and Reduction of Interest Rate
Financing Receivable, Allowance for Credit Losses [Line Items]
Post-modification recorded investment	4,253
Extended Maturity, Amortization and Reduction of Interest Rate | Residential real estate | Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Post-modification recorded investment	484
Extended Maturity, Amortization and Reduction of Interest Rate | Indirect vehicle | Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Post-modification recorded investment	0
Extended Maturity, Amortization and Reduction of Interest Rate | Home equity | Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Post-modification recorded investment	3,769
Extended Maturity, Amortization and Reduction of Interest Rate | Uncollateralized | Commercial | Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Post-modification recorded investment	0
Extended Maturity, Amortization and Reduction of Interest Rate | Collateralized | Commercial | Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Post-modification recorded investment	0
Extended Maturity and/or Amortization
Financing Receivable, Allowance for Credit Losses [Line Items]
Post-modification recorded investment	20,214
Extended Maturity and/or Amortization | Residential real estate | Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Post-modification recorded investment	712
Extended Maturity and/or Amortization | Indirect vehicle | Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Post-modification recorded investment	0
Extended Maturity and/or Amortization | Home equity | Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Post-modification recorded investment	2,030
Extended Maturity and/or Amortization | Uncollateralized | Commercial | Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Post-modification recorded investment	17,472
Extended Maturity and/or Amortization | Collateralized | Commercial | Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Post-modification recorded investment	0
Maturity, Delay in Payments and Reduction of Amount
Financing Receivable, Allowance for Credit Losses [Line Items]
Post-modification recorded investment	794
Maturity, Delay in Payments and Reduction of Amount | Residential real estate | Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Post-modification recorded investment	0
Maturity, Delay in Payments and Reduction of Amount | Indirect vehicle | Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Post-modification recorded investment	0
Maturity, Delay in Payments and Reduction of Amount | Home equity | Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Post-modification recorded investment	0
Maturity, Delay in Payments and Reduction of Amount | Uncollateralized | Commercial | Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Post-modification recorded investment	0
Maturity, Delay in Payments and Reduction of Amount | Collateralized | Commercial | Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Post-modification recorded investment	794
Delay in Payments or Reduction of Interest Rate
Financing Receivable, Allowance for Credit Losses [Line Items]
Post-modification recorded investment	6,908
Delay in Payments or Reduction of Interest Rate | Residential real estate | Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Post-modification recorded investment	1,053
Delay in Payments or Reduction of Interest Rate | Indirect vehicle | Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Post-modification recorded investment	220
Delay in Payments or Reduction of Interest Rate | Home equity | Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Post-modification recorded investment	1,247
Delay in Payments or Reduction of Interest Rate | Uncollateralized | Commercial | Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Post-modification recorded investment	4,388
Delay in Payments or Reduction of Interest Rate | Collateralized | Commercial | Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Post-modification recorded investment	$ 0

Loans (Details 9)

Loans (Details 9) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	$ 131,508	$ 114,057	$ 113,462
Allowance for unfunded credit commitments acquired through business combination	0	0	1,261
Utilization of allowance for unfunded credit commitments	0	0	(637)
Provision for credit losses	19,563	21,386	12,052
Total charge-offs	20,611	17,211	24,745
Total recoveries	11,382	13,276	12,664
Net charge-offs	9,229	3,935	12,081
Allowance for credit losses	141,842	131,508	114,057
Allowance for unfunded credit commitments	(2,476)	(3,368)	(4,031)
Balance at December 31,	139,366	128,140	110,026
Commercial Real Estate Portfolio Segment | Commercial real estate and residential real estate
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	2,851	3,563	11,438
Recoveries	3,729	6,723	4,020
Balance at December 31,	51,807	45,475	41,826
Commercial Real Estate Portfolio Segment | Construction real estate
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	593	34	79
Recoveries	142	272	252
Balance at December 31,	14,758	15,113	8,918
Consumer Portfolio Segment
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	131,508	114,057
Charge-offs	1,662
Total charge-offs	20,611	17,211
Total recoveries	11,382	13,276
Allowance for credit losses	141,842	131,508	114,057
Allowance for unfunded credit commitments	(2,476)	(3,368)	(4,031)
Consumer Portfolio Segment | Commercial real estate and residential real estate
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	1,356	1,450	1,718
Recoveries	1,210	515	1,190
Balance at December 31,	5,971	5,734	6,646
Consumer Portfolio Segment | Indirect vehicle
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	3,505	2,980	3,735
Recoveries	1,837	1,853	1,736
Balance at December 31,	3,421	2,418	1,687
Consumer Portfolio Segment | Home equity
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	1,662	1,485	3,383
Recoveries	756	579	482
Balance at December 31,	5,469	7,374	9,456
Consumer Portfolio Segment | Other consumer
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	1,778	1,941	2,128
Recoveries	724	473	288
Uncollateralized | Commercial Portfolio Segment | Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	2,126	2,993	1,339
Recoveries	2,434	1,749	3,757
Balance at December 31,	44,661	39,316	29,571
Collateralized | Commercial Portfolio Segment
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	6,740	2,765
Recoveries	550	1,112
Balance at December 31,	12,238	10,434	9,962
Collateralized | Commercial Portfolio Segment | Commercial collateralized by assignment of lease payments
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	6,740	2,765	925
Recoveries	$ 550	$ 1,112	$ 939

Loans (Details 10)

Loans (Details 10) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015
Allowance for credit losses:
Beginning balance		$ 128,140	$ 110,026
Ending balance		139,366	128,140	$ 110,026
Ending allowance balance attributable to loans:
Total ending allowance balance		128,140	110,026	110,026	$ 139,366	$ 128,140
Loans:
Total loans					12,768,803	9,793,998
Unfunded Commitments:
Beginning balance		3,368	4,031
Ending balance		2,476	3,368	4,031
Unfunded commitments ending allowance balance:
Total ending allowance balance		3,368	4,031	4,031	2,476	3,368
Allowance for credit losses
Balance at beginning of year		131,508	114,057	113,462
Allowance for credit losses, Charge-offs		20,611	17,211	24,745
Allowance for credit losses, Recoveries		11,382	13,276	12,664
Allowance for credit losses		141,842	131,508	114,057
Allowance for credit losses ending allowance balance:
Total ending allowance balance		131,508	114,057	113,462	141,842	131,508
Net charge-offs (recoveries)		9,229	3,935	12,081
Purchased credit-impaired loans
Allowance for credit losses:
Provision		144	2,000
Allowance for credit losses ending allowance balance:
Net charge-offs (recoveries)		1,400	(2,800)
Commercial Real Estate Portfolio Segment | Commercial real estate and residential real estate
Allowance for credit losses:
Beginning balance		45,475	41,826
Charge-offs		2,851	3,563	11,438
Recoveries		3,729	6,723	4,020
Provision		5,454	489
Ending balance		51,807	45,475	41,826
Ending allowance balance attributable to loans:
Individually evaluated for impairment					354	6,859
Collectively evaluated for impairment					50,811	37,198
Acquired and accounted for under ASC 310-30	[1]				642	1,418
Total ending allowance balance		45,475	41,826	41,826	51,807	45,475
Loans:
Individually evaluated for impairment					6,443	30,204
Collectively evaluated for impairment					3,781,573	2,665,472
Acquired and accounted for under ASC 310-30	[1]				46,994	36,362
Total loans					3,835,010	2,732,038
Allowance for credit losses ending allowance balance:
Acquired and accounted for under ASC 310-30	[1]				642	1,418
Allowance for loan losses and unfunded commitments acquired with deteriorated credit quality					866	2,100
Commercial Real Estate Portfolio Segment | Construction real estate
Allowance for credit losses:
Beginning balance		15,113	8,918
Charge-offs		593	34	79
Recoveries		142	272	252
Provision		96	5,957
Ending balance		14,758	15,113	8,918
Ending allowance balance attributable to loans:
Individually evaluated for impairment					0	0
Collectively evaluated for impairment					14,712	15,019
Acquired and accounted for under ASC 310-30	[1]				46	94
Total ending allowance balance		15,113	8,918	8,918	14,758	15,113
Loans:
Individually evaluated for impairment					0	0
Collectively evaluated for impairment					518,562	252,060
Acquired and accounted for under ASC 310-30	[1]				4,832	10,891
Total loans					523,394	262,951
Allowance for credit losses ending allowance balance:
Acquired and accounted for under ASC 310-30	[1]				46	94
Consumer Portfolio Segment
Allowance for credit losses:
Charge-offs		1,662
Ending allowance balance attributable to loans:
Acquired and accounted for under ASC 310-30	[1]				866	2,077
Loans:
Individually evaluated for impairment					73,914	114,465
Collectively evaluated for impairment					12,531,812	9,538,127
Acquired and accounted for under ASC 310-30	[1]				163,077	141,406
Total loans					12,768,803	9,793,998
Unfunded Commitments:
Beginning balance		3,368	4,031
Provision		(892)	(663)
Ending balance		2,476	3,368	4,031
Unfunded commitments ending allowance balance:
Individually evaluated for impairment for unfunded commitments					617	1,392
Unfunded commitments collectively evaluated for impairment					1,859	1,976
Total ending allowance balance		3,368	4,031	4,031	2,476	3,368
Allowance for credit losses
Balance at beginning of year		131,508	114,057
Allowance for credit losses, Charge-offs		20,611	17,211
Allowance for credit losses, Recoveries		11,382	13,276
Allowance for credit losses, Provision		19,563	21,386
Allowance for credit losses		141,842	131,508	114,057
Allowance for credit losses ending allowance balance:
Allowance for credit losses, individually evaluated for impairment					8,953	23,329
Allowance for credit losses, collectively evaluated for impairment					132,023	106,102
Acquired and accounted for under ASC 310-30	[1]				866	2,077
Total ending allowance balance		131,508	114,057	114,057	141,842	131,508
Consumer Portfolio Segment | Commercial real estate and residential real estate
Allowance for credit losses:
Beginning balance		5,734	6,646
Charge-offs		1,356	1,450	1,718
Recoveries		1,210	515	1,190
Provision		383	23
Ending balance		5,971	5,734	6,646
Ending allowance balance attributable to loans:
Individually evaluated for impairment					2,163	2,634
Collectively evaluated for impairment					3,808	3,100
Total ending allowance balance		5,734	6,646	6,646	5,971	5,734
Loans:
Individually evaluated for impairment					14,353	13,739
Collectively evaluated for impairment					1,046,475	614,430
Acquired and accounted for under ASC 310-30	[1]				72,184	53,156
Total loans					1,133,012	681,325
Consumer Portfolio Segment | Indirect vehicle
Allowance for credit losses:
Beginning balance		2,418	1,687
Charge-offs		3,505	2,980	3,735
Recoveries		1,837	1,853	1,736
Provision		2,671	1,858
Ending balance		3,421	2,418	1,687
Ending allowance balance attributable to loans:
Collectively evaluated for impairment					3,421	2,418
Total ending allowance balance		2,418	1,687	1,687	3,421	2,418
Loans:
Individually evaluated for impairment					122	119
Collectively evaluated for impairment					541,558	383,976
Total loans					541,680	384,095
Consumer Portfolio Segment | Home equity
Allowance for credit losses:
Beginning balance		7,374	9,456
Charge-offs		1,662	1,485	3,383
Recoveries		756	579	482
Provision		(999)	(1,176)
Ending balance		5,469	7,374	9,456
Ending allowance balance attributable to loans:
Individually evaluated for impairment					2,930	3,131
Collectively evaluated for impairment					2,539	4,243
Total ending allowance balance		7,374	9,456	9,456	5,469	7,374
Loans:
Individually evaluated for impairment					28,790	29,510
Collectively evaluated for impairment					237,587	187,063
Acquired and accounted for under ASC 310-30	[1]				14,549	14,004
Total loans					280,926	230,577
Consumer Portfolio Segment | Other consumer
Allowance for credit losses:
Beginning balance		2,276	1,960
Charge-offs		1,778	1,941
Recoveries		724	473
Provision		(181)	1,784
Ending balance		1,041	2,276	1,960
Ending allowance balance attributable to loans:
Collectively evaluated for impairment					1,041	2,276
Total ending allowance balance		2,276	1,960	1,960	1,041	2,276
Loans:
Individually evaluated for impairment					0	0
Collectively evaluated for impairment					80,781	80,661
Acquired and accounted for under ASC 310-30	[1]				2,261	2,709
Total loans					83,042	83,370
Uncollateralized | Commercial Portfolio Segment | Commercial
Allowance for credit losses:
Beginning balance		39,316	29,571
Charge-offs		2,126	2,993	1,339
Recoveries		2,434	1,749	3,757
Provision		5,037	10,989
Ending balance		44,661	39,316	29,571
Ending allowance balance attributable to loans:
Individually evaluated for impairment					2,889	7,523
Collectively evaluated for impairment					41,594	31,228
Acquired and accounted for under ASC 310-30	[1]				178	565
Total ending allowance balance		39,316	29,571	29,571	44,661	39,316
Loans:
Individually evaluated for impairment					23,459	34,647
Collectively evaluated for impairment					4,323,047	3,581,639
Acquired and accounted for under ASC 310-30	[1]				22,257	24,284
Total loans					4,368,763	3,640,570
Allowance for credit losses ending allowance balance:
Acquired and accounted for under ASC 310-30	[1]				178	565
Collateralized | Commercial Portfolio Segment
Allowance for credit losses:
Beginning balance		10,434	9,962
Charge-offs		6,740	2,765
Recoveries		550	1,112
Provision		7,994	2,125
Ending balance		12,238	10,434	9,962
Ending allowance balance attributable to loans:
Individually evaluated for impairment					0	1,790
Collectively evaluated for impairment					12,238	8,644
Total ending allowance balance		$ 10,434	$ 9,962	$ 9,962	12,238	10,434
Loans:
Individually evaluated for impairment					747	6,246
Collectively evaluated for impairment					2,002,229	1,772,826
Total loans					$ 2,002,976	$ 1,779,072
[1]	Loans acquired in business combinations and accounted for under ASC Topic 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, 2016	Dec. 31, 2015
Changes in the accretable yield for purchased credit-impaired loans
Balance at beginning of period		$ 12,596	$ 7,434
Purchases		5,086	0
Accretion		(9,585)	(9,637)
Other	[1]	7,953	14,799
Balance at end of period		$ 16,050	$ 12,596
[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 Topic 310-30.

Loans (Details 12)

Loans (Details 12) $ in Thousands	Dec. 31, 2016USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non covered loans	$ 2,650,491
Total acquired	2,667,130
Purchased Credit-Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non covered loans	80,315
Total acquired	96,954
Purchased Non-Credit-Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non covered loans	2,570,176
Total acquired	2,570,176
Commercial Loans, Commercial Real Estate Receivable And Construction Loans | Heritage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount of loans	1,600
Commercial Loans, Commercial Real Estate Receivable And Construction Loans | Benchmark
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount of loans	1,600
Commercial Loans, Commercial Real Estate Receivable And Construction Loans | Broadway and New Century
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount of loans	5,500
Commercial Real Estate Portfolio Segment | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non covered loans	1,325,696
Commercial Real Estate Portfolio Segment | Residential real estate | Purchased Credit-Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non covered loans	46,994
Commercial Real Estate Portfolio Segment | Residential real estate | Purchased Non-Credit-Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non covered loans	1,278,702
Commercial Real Estate Portfolio Segment | Construction real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non covered loans	20,168
Commercial Real Estate Portfolio Segment | Construction real estate | Purchased Credit-Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non covered loans	4,832
Commercial Real Estate Portfolio Segment | Construction real estate | Purchased Non-Credit-Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non covered loans	15,336
Consumer Portfolio Segment | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased credit impaired and covered loans	16,639
Non covered loans	380,492
Consumer Portfolio Segment | Other consumer | Purchased Credit-Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased credit impaired and covered loans	16,639
Non covered loans	6,232
Consumer Portfolio Segment | Other consumer | Purchased Non-Credit-Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased credit impaired and covered loans	0
Non covered loans	374,260
Uncollateralized | Commercial Portfolio Segment | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non covered loans	820,016
Uncollateralized | Commercial Portfolio Segment | Commercial | Purchased Credit-Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non covered loans	22,257
Uncollateralized | Commercial Portfolio Segment | Commercial | Purchased Non-Credit-Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non covered loans	797,759
Collateralized | Commercial Portfolio Segment | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non covered loans	104,119
Collateralized | Commercial Portfolio Segment | Commercial | Purchased Credit-Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non covered loans	0
Collateralized | Commercial Portfolio Segment | Commercial | Purchased Non-Credit-Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non covered loans	104,119
Other Loans Receivable | Ginnie Mae [Member] | Purchased Credit-Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of purchased loans	$ 66,100

Lease Investments (Details)

Lease Investments (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015
Direct finance leases:
Minimum lease payments		$ 433,451	$ 392,901
Estimated unguaranteed residual values		78,256	74,411
Less: unearned income		(36,327)	(34,675)
Direct finance leases	[1]	475,380	432,637
Leveraged leases:
Minimum lease payments		821	3,286
Estimated unguaranteed residual values		108	523
Less: unearned income		(25)	(126)
Less: related non-recourse debt		(803)	(3,199)
Leveraged leases	[1]	101	484
Operating leases:
Equipment, at cost		440,861	318,843
Less accumulated depreciation		(129,534)	(107,156)
Lease investments, net		$ 311,327	211,687
Minimum percentage of residual component in total equipment investment		10.00%
Loans at other banks for lease equipment purchases		$ 66,900	$ 55,000
[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, 2016USD ($)
Direct Finance Leases
2,017	$ 157,419
2,018	116,334
2,019	76,393
2,020	44,327
2,021	21,723
Thereafter	17,255
Total	433,451
Leveraged Leases
2,017	642
2,018	179
2,019	0
2,020	0
2,021	0
Thereafter	0
Total	821
Operating Leases
2,017	68,132
2,018	53,383
2,019	38,013
2,020	23,500
2,021	16,157
Thereafter	21,034
Total	220,219
Total
2,017	226,193
2,018	169,896
2,019	114,406
2,020	67,827
2,021	37,880
Thereafter	38,289
Total	$ 654,491

Lease Investments (Details 3)

Lease Investments (Details 3) $ in Thousands	Dec. 31, 2016USD ($)
Operating leases rent expense net
2,017	$ 31,137
2,018	27,622
2,019	29,438
2,020	26,934
2,021	23,038
Thereafter	40,195
Total	178,364
Direct Finance Leases
Operating leases rent expense net
2,017	17,927
2,018	16,072
2,019	16,776
2,020	11,075
2,021	3,266
Thereafter	13,140
Total	78,256
Leveraged Leases
Operating leases rent expense net
2,017	89
2,018	19
2,019	0
2,020	0
2,021	0
Thereafter	0
Total	108
Operating Leases
Operating leases rent expense net
2,017	13,121
2,018	11,531
2,019	12,662
2,020	15,859
2,021	19,772
Thereafter	27,055
Total	$ 100,000

Lease Investments (Details 4)

Lease Investments (Details 4) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)lease	Dec. 31, 2015USD ($)lease	Dec. 31, 2014USD ($)
Leases [Abstract]
Number of leases | lease	4,248	4,369
Average residual value per lease	$ 42	$ 33
Average residual value per master lease	176	132
Income from Lease Financing:
Rental income	69,083	59,668	$ 67,135
Equipment maintenance contracts revenue, net of cost of sales	25,005	23,027	16,441
Vendor promotional income	11,073	8,527	8,382
Other lease related revenue	4,254	5,769	2,356
Gain on sale of lease payments and leased equipment, net of residual write downs	13,241	17,006	9,546
Income on lease investments, gross	122,656	113,997	103,860
Less: depreciation on operating leases	(49,170)	(37,416)	(39,550)
Lease financing, net	$ 73,486	$ 76,581	$ 64,310

Premises and Equipment (Details

Premises and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Premises and Equipment
Premises and equipment, gross	$ 463,262	$ 368,161
Accumulated depreciation	(169,352)	(132,148)
Premises and equipment, net	293,910	236,013
Depreciation of premises and equipment and leased equipment	25,500	22,100	$ 20,400
Land and land improvements
Premises and Equipment
Premises and equipment, gross	81,468	67,089
Buildings
Premises and Equipment
Premises and equipment, gross	122,268	100,041
Furniture and equipment
Premises and Equipment
Premises and equipment, gross	182,924	139,648
Buildings and leasehold improvements
Premises and Equipment
Premises and equipment, gross	$ 76,602	$ 61,383

Goodwill and Intangibles (Detai

Goodwill and Intangibles (Details)		12 Months Ended
		Dec. 31, 2016USD ($)reporting_unit	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
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		725,070,000	711,521,000
Goodwill from business combinations	[1]	275,968,000	13,549,000
Balance at end of period		$ 1,001,038,000	725,070,000	711,521,000
Weighted average amortization period (in years)		13 years
Other intangibles from business combinations		$ 25,452,000	12,921,000
American Chartered Merger
Goodwill [Roll Forward]
Goodwill from business combinations		276,000,000
American Chartered Merger | Core Deposits
Goodwill [Roll Forward]
Other intangibles from business combinations		25,500,000
Banking
Goodwill [Roll Forward]
Balance at beginning of period		684,430,000	670,881,000
Goodwill from business combinations	[1]	275,968,000	13,549,000
Balance at end of period		960,398,000	684,430,000	670,881,000
Leasing
Goodwill [Roll Forward]
Balance at beginning of period		40,640,000	40,640,000
Balance at end of period		40,640,000	40,640,000	40,640,000
Mortgage Banking
Goodwill [Roll Forward]
Balance at beginning of period		0	0
Balance at end of period		$ 0	$ 0	$ 0
[1]	Due to the American Chartered merger and adjustments recognized for the MSA acquisition.

Goodwill and Intangibles (Det86

Goodwill and Intangibles (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Finite-lived Intangible Assets [Roll Forward]
Balance at beginning of period	$ 44,812	$ 38,006
Amortization expense	(7,305)	(6,115)	$ (5,501)
Other intangibles from business combinations	25,452	12,921
Gross carrying amount	112,820	93,292
Accumulated amortization	(49,861)	(48,480)
Balance at end of period	$ 62,959	$ 44,812	$ 38,006

Goodwill and Intangibles (Det87

Goodwill and Intangibles (Details 3) $ in Thousands	Dec. 31, 2016USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2,017	$ 8,193
2,018	7,451
2,019	5,674
2,020	5,022
2,021	4,790
Thereafter	31,829
Finite-Lived Intangible Assets, Net	$ 62,959

Deposits (Details)

Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Banking and Thrift [Abstract]
Demand deposit accounts, noninterest bearing	$ 6,408,169	$ 4,627,184
NOW and money market accounts	4,543,004	4,144,633
Savings accounts	1,135,992	974,555
Certificates of deposit, $250,000 or more	1,144,121	877,352
Other certificates of deposit	879,162	881,491
Total deposits	14,110,448	11,505,215
Brokered deposits	$ 795,000	$ 500,200

Deposits (Details 2)

Deposits (Details 2) $ in Thousands	Dec. 31, 2016USD ($)
Banking and Thrift [Abstract]
2,017	$ 1,224,620
2,018	444,103
2,019	147,591
2,020	145,410
2,021	50,597
Thereafter	10,962
Total	$ 2,023,283

Short-Term Borrowings (Details)

Short-Term Borrowings (Details) - USD ($)	Dec. 18, 2015	Dec. 31, 2016	Dec. 31, 2015
Short-term borrowings
Weighted Average Cost		0.59%	0.23%
Amount		$ 1,569,288,000	$ 1,005,737,000
Fixed interest rate Federal Home Loan Bank advances		$ 1,300,000,000	$ 775,000,000
Customer repurchase agreements
Short-term borrowings
Weighted Average Cost		0.22%	0.20%
Amount		$ 237,538,000	$ 201,207,000
Federal Home Loan Bank advances
Short-term borrowings
Weighted Average Cost		0.63%	0.17%
Amount		$ 1,275,000,000	$ 775,000,000
Federal funds purchased
Short-term borrowings
Weighted Average Cost		0.80%	0.09%
Amount		$ 46,750,000	$ 4,530,000
Line of credit
Short-term borrowings
Weighted Average Cost		2.52%	2.18%
Amount		$ 10,000,000	$ 25,000,000
Unsecured line of credit	$ 35,000,000
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)		0.41%
Maximum
Short-term borrowings
Effective interest rate for fixed rate advance (as a percent)		0.70%

Long-term Borrowings (Details)

Long-term Borrowings (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Aug. 24, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Weighted Average Cost (percent)	1.64%		1.41%
Long-term borrowings	$ 311,790		$ 400,274
Federal Home Loan Bank advances
Debt Instrument [Line Items]
Weighted Average Cost (percent)	0.85%		0.45%
Long-term borrowings	$ 230,865		$ 305,239
Notes payable
Debt Instrument [Line Items]
Weighted Average Cost (percent)	4.18%		4.30%
Long-term borrowings	$ 66,925		$ 54,998
Structured repurchase agreement
Debt Instrument [Line Items]
Weighted Average Cost (percent)	0.00%		4.75%
Long-term borrowings	$ 0		$ 40,037
Term note
Debt Instrument [Line Items]
Weighted Average Cost (percent)	2.52%		0.00%
Long-term borrowings	$ 14,000	$ 16,000	$ 0

Long-term Borrowings (Details 2

Long-term Borrowings (Details 2) - USD ($) $ in Thousands	Aug. 24, 2016	Dec. 31, 2015	Dec. 31, 2016
Debt Instrument [Line Items]
Federal Home Loan Bank advances		$ 305,200	$ 230,900
Long-term borrowings		$ 400,274	$ 311,790
Weighted average interest rate		1.41%	1.64%
Federal Home Loan Bank advances
Debt Instrument [Line Items]
Long-term borrowings		$ 305,239	$ 230,865
Weighted average interest rate		0.45%	0.85%
Notes payable to banks
Debt Instrument [Line Items]
Long-term borrowings		$ 54,998	$ 66,925
Weighted average interest rate		4.30%	4.18%
Equipment pledged as collateral		$ 65,800	$ 79,600
Unsecured term loan
Debt Instrument [Line Items]
Long-term borrowings	$ 16,000	$ 0	$ 14,000
Weighted average interest rate		0.00%	2.52%
Quarterly periodic payments	$ 1,000
Structured repurchase agreement
Debt Instrument [Line Items]
Long-term borrowings		$ 40,037	$ 0
Weighted average interest rate		4.75%	0.00%
Term of structured repurchase agreement (in years)		10 years
Fixed interest rate, if option not exercised (as a percent)		4.75%
Minimum | Federal Home Loan Bank advances
Debt Instrument [Line Items]
Interest rate			0.30%
Minimum | Notes payable to banks
Debt Instrument [Line Items]
Interest rates (as a percent)			2.25%
Maximum | Federal Home Loan Bank advances
Debt Instrument [Line Items]
Interest rate			5.87%
Maximum | Notes payable to banks
Debt Instrument [Line Items]
Interest rates (as a percent)			7.40%
London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Interest rate, basis spread (as a percent)	1.75%

Long-term Borrowings (Details 3

Long-term Borrowings (Details 3) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Debt Disclosure [Abstract]
2,017	$ 109,510
2,018	174,908
2,019	15,562
2,020	6,553
2,021	1,345
Thereafter	3,912
Long-term borrowings	$ 311,790	$ 400,274

Junior Subordinated Notes Iss94

Junior Subordinated Notes Issued to Capital Trusts (Details) - USD ($)		Sep. 22, 2014	Sep. 30, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Outstanding junior subordinated notes
Principal balance				$ 210,668,000	$ 186,164,000
Liquidation amount of trust preferred securities				71,845,000	22,232,000	$ 13,059,000
Gain on extinguishment of debt				$ 0	$ 0	$ 1,895,000
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 | Trust preferred securities issued by each trust
Outstanding junior subordinated notes
Face Value				$ 25,000,000
Interest rate, basis spread (as a percent)				1.80%
Coal City Capital Trust I | Junior Subordinated Notes
Outstanding junior subordinated notes
Principal balance				$ 25,774,000
Interest rate, basis spread (as a percent)				1.80%
MB Financial Capital Trust II | Trust preferred securities issued by each trust
Outstanding junior subordinated notes
Face Value				$ 35,000,000
Interest rate, basis spread (as a percent)				1.40%
MB Financial Capital Trust II | Junior Subordinated Notes
Outstanding junior subordinated notes
Principal balance				$ 36,083,000
Interest rate, basis spread (as a percent)				1.40%
MB Financial Capital Trust III | Trust preferred securities issued by each trust
Outstanding junior subordinated notes
Face Value				$ 10,000,000
Interest rate, basis spread (as a percent)				1.50%
MB Financial Capital Trust III | Junior Subordinated Notes
Outstanding junior subordinated notes
Principal balance				$ 10,310,000
Interest rate, basis spread (as a percent)				1.50%
MB Financial Capital Trust IV | Trust preferred securities issued by each trust
Outstanding junior subordinated notes
Face Value				$ 20,000,000
Interest rate, basis spread (as a percent)				1.52%
MB Financial Capital Trust IV | Junior Subordinated Notes
Outstanding junior subordinated notes
Principal balance				$ 20,619,000
Interest rate, basis spread (as a percent)				1.52%
MB Financial Capital Trust V | Trust preferred securities issued by each trust
Outstanding junior subordinated notes
Face Value				$ 30,000,000
Interest rate, basis spread (as a percent)				1.30%
MB Financial Capital Trust V | Junior Subordinated Notes
Outstanding junior subordinated notes
Principal balance				$ 30,928,000
Interest rate, basis spread (as a percent)				1.30%
MB Financial Capital Trust VI | Trust preferred securities issued by each trust
Outstanding junior subordinated notes
Face Value				$ 22,500,000
Interest rate, basis spread (as a percent)				1.30%
MB Financial Capital Trust VI | Junior Subordinated Notes
Outstanding junior subordinated notes
Principal balance				$ 23,196,000
Interest rate, basis spread (as a percent)				1.30%
FOBB Statutory Trust III | Trust preferred securities issued by each trust
Outstanding junior subordinated notes
Face Value	[1]			$ 5,000,000
Interest rate, basis spread (as a percent)	[1]			2.80%
FOBB Statutory Trust III | Junior Subordinated Notes
Outstanding junior subordinated notes
Principal balance	[1]			$ 5,155,000
Interest rate, basis spread (as a percent)	[1]			2.80%
TAYC Capital Trust II
Outstanding junior subordinated notes
Purchase accounting adjustments discount				$ 6,800,000
TAYC Capital Trust II | Trust preferred securities issued by each trust
Outstanding junior subordinated notes
Face Value	[2]			$ 40,000,000
Interest rate, basis spread (as a percent)	[2]			2.68%
TAYC Capital Trust II | Junior Subordinated Notes
Outstanding junior subordinated notes
Principal balance	[2]			$ 41,238,000
Interest rate, basis spread (as a percent)	[2]			2.68%
Taylor Capital Trust I | Junior Subordinated Notes
Outstanding junior subordinated notes
Stated interest rate		9.75%
Liquidation amount of trust preferred securities		$ 45,400,000
Gain on extinguishment of debt			$ 1,900,000
American Chartered Statutory Trust I
Outstanding junior subordinated notes
Purchase accounting adjustments discount				$ 6,400,000
American Chartered Statutory Trust I | Trust preferred securities issued by each trust
Outstanding junior subordinated notes
Face Value	[3]			$ 20,000,000
Interest rate, basis spread (as a percent)	[3]			3.60%
American Chartered Statutory Trust I | Junior Subordinated Notes
Outstanding junior subordinated notes
Principal balance	[3]			$ 20,619,000
Interest rate, basis spread (as a percent)	[3]			3.60%
American Chartered Statutory Trust II
Outstanding junior subordinated notes
Purchase accounting adjustments discount				$ 6,400,000
American Chartered Statutory Trust II | Trust preferred securities issued by each trust
Outstanding junior subordinated notes
Face Value	[3]			$ 10,000,000
Interest rate, basis spread (as a percent)	[3]			2.75%
American Chartered Statutory Trust II | Junior Subordinated Notes
Outstanding junior subordinated notes
Principal balance	[3]			$ 10,464,000
Interest rate, basis spread (as a percent)	[3]			2.75%
[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 $6.8 million as of December 31, 2016.
[3]	American Chartered Statutory Trust I and American Chartered Statutory Trust II were established by American Chartered prior to the Company's acquisition of American Chartered in August 2016, and the junior subordinated notes issued by American Chartered to American Chartered Statutory Trust I and American Chartered Statutory Trust II were assumed by the Company upon completion of the acquisition. Principal balance and face value amounts associated with American Chartered Statutory Trust I and American Chartered Statutory Trust II do not include purchase accounting adjustments to such amounts, which in each case resulted in a discount of $6.4 million as of December 31, 2016.

Lease Commitments and Rental 95

Lease Commitments and Rental Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net Rents
Net rental expense	$ 10,900	$ 8,900	$ 7,400
Office space
Gross Rents
2,017	11,972
2,018	10,472
2,019	9,487
2,020	6,067
2,021	5,003
Thereafter	22,883
Total	65,884
Sublease Rents
2,017	1,384
2,018	1,252
2,019	989
2,020	420
2,021	175
Thereafter	0
Total	4,220
Net Rents
2,017	10,588
2,018	9,220
2,019	8,498
2,020	5,647
2,021	4,828
Thereafter	22,883
Total	$ 61,664

Employee Benefit Plans (Details

Employee Benefit Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
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	$ 14,800
Company's total contribution to plan		$ 14,200	$ 7,400
Deferred Compensation Plan
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	$ 806
Actual employer's contribution		$ 839	$ 512
Deferred Compensation Plan | Chief executive officer
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	$ 18,700
Decreases in fair market value of assets and obligation	$ 1,300

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax asset:
Allowance for credit losses	$ 55,525	$ 51,256
State net operating loss carryforwards	20,570	22,624
Other real estate owned	9,845	11,165
Stock options and restricted stock	9,675	7,317
Loans	36,770	36,386
Deferred compensation	8,556	8,550
Tax credit carryforwards	32,262	27,904
Bonus accrual	4,877	3,827
Other items	666	1,008
Total deferred tax asset	178,746	170,037
Valuation allowance	0	0
Total deferred tax asset, net of valuation allowance	178,746	170,037
Deferred tax liability:
Equipment leasing	(152,282)	(132,159)
Premises and equipment	(25,015)	(21,371)
Mortgage servicing rights	(76,468)	(59,369)
Deferred income from FDIC-assisted transactions	(46,443)	(43,102)
Investment securities	(7,270)	(2,317)
FHLB stock dividends	(3,221)	(3,207)
Core deposit intangible	(15,516)	(7,448)
Other items	(893)	(3,509)
Total deferred tax liability	(327,108)	(272,482)
Net deferred tax liability	(148,362)	(102,445)
Net unrealized holding gain on investment securities available for sale	(3,296)	(10,137)
Net deferred tax liability	$ (151,658)	$ (112,582)

Income Taxes (Details 2)

Income Taxes (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current expense (benefit):
Federal	$ 26,081	$ 30,283	$ 25,270
State	7,204	3,355	11,971
Foreign	42	0	0
Current expense (benefit)	33,327	33,638	37,241
Deferred expense (benefit):
Federal	37,690	28,765	3,122
State	8,227	10,808	(3,170)
Foreign	0	0	0
Deferred income tax expense (benefit)	45,917	39,573	(48)
Income tax expense	79,244	$ 73,211	$ 37,193
Federal Alternative Minimum Tax Credit Carryforward
Operating loss carryforwards
Tax credit carryforward	26,700
General Business Tax Credit Carryforward
Operating loss carryforwards
Tax credit carryforward	5,400
State
Operating loss carryforwards
Net operating loss carryforwards	3,400
Illinois | State
Operating loss carryforwards
Net operating loss carryforwards	$ 404,300

Income Taxes (Details 3)

Income Taxes (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Statutory federal income tax rate (as a percent)	35.00%	35.00%	35.00%
Federal income tax expense at expected statutory rate	$ 88,683	$ 81,256	$ 43,153
Increase (decrease) due to:
Tax exempt income, net	(18,214)	(16,909)	(14,848)
State tax expense net of federal impact	10,030	9,205	5,721
Non-deductible contingent consideration	1,026	158	3,738
Non-includable increase in cash surrender value of life insurance	(1,432)	(1,191)	(1,120)
Non-deductible merger expense	298	360	988
Adjustment of tax contingency reserves	1	(969)	(31)
Other items, net	(1,148)	1,301	(408)
Income tax expense	$ 79,244	$ 73,211	$ 37,193

Income Taxes (Details 4)

Income Taxes (Details 4) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)
Unrecognized Tax Benefit Without Interest
Balance at the beginning of the period	$ 17
Increases for tax positions of prior years	0
Balance at the end of the period	17
Interest on unrecognized Tax Benefit
Balance at the beginning of the period	2
Increases for tax positions of prior years	1
Balance at the end of the period	3
Total Unrecognized Tax Benefit Including Interest
Balance at the beginning of the period	19
Increases for tax positions of prior years	1
Balance at the end of the period	$ 20

Commitments and Contingencie101

Commitments and Contingencies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Other Commitments [Abstract]
Maximum maturity period for letters of credit (in years)	5 years
Increase in maximum potential amount of future payments under letters of credit	$ 48,100
Dollar amount of letters of credit outstanding	187,200	$ 139,100
Letters of credit issued or renewed	158,100
Capital expenditure commitments outstanding	3,500
Home equity lines
Long-term Purchase Commitment [Line Items]
Dollar amount of line of credit outstanding	235,279	187,478
Other commitments
Long-term Purchase Commitment [Line Items]
Dollar amount of line of credit outstanding	3,679,259	3,049,152
Standby
Long-term Purchase Commitment [Line Items]
Dollar amount of line of credit outstanding	185,386	137,945
Commercial
Long-term Purchase Commitment [Line Items]
Dollar amount of line of credit outstanding	$ 1,766	$ 1,108

Commitments and Contingencie102

Commitments and Contingencies (Details 2)	12 Months Ended
	Dec. 31, 2016
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, 2016	Dec. 31, 2015
Total capital (to risk-weighted assets):
Total capital (to risk-weighted assets): Actual Amount	$ 1,878,106	$ 1,635,548
Total capital (to risk-weighted assets): Actual Ratio (as a percent)	11.63%	12.54%
Total capital (to risk-weighted assets): For Capital Adequacy Purposes Amount	$ 1,292,159	$ 1,043,025
Total capital (to risk-weighted assets): For Capital Adequacy Purposes Ratio (as a percent)	8.00%	8.00%
Tier 1 capital (to risk-weighted assets):
Tier 1 capital (to risk-weighted assets): Actual Amount	$ 1,518,472	$ 1,504,040
Tier 1 capital (to risk-weighted assets): Actual Ratio (as a percent)	9.40%	11.54%
Tier 1 capital (to risk-weighted assets): For Capital Adequacy Purposes Amount	$ 969,119	$ 782,269
Tier 1 capital (to risk-weighted assets): For Capital Adequacy Purposes Ratio (as a percent)	6.00%	6.00%
Common equity tier 1 capital (to risk-weighted assets):
Common equity tier 1 capital (to risk-weighted assets): Actual Amount	$ 1,408,481	$ 1,208,938
Common equity tier 1 capital (to risk-weighted assets): Actual Ratio (as a percent)	8.72%	9.27%
Common equity tier 1 capital (to risk-weighted assets): For Capital Adequacy Purposes Amount	$ 726,839	$ 586,702
Common equity tier 1 capital (to risk-weighted assets): For Capital Adequacy Purposes Ratio (as a percent)	4.50%	4.50%
Tier 1 capital (to average assets):
Tier 1 capital (to average assets): Actual Amount	$ 1,518,472	$ 1,504,040
Tier 1 capital (to average assets): Actual Ratio (as a percent)	8.38%	10.40%
Tier 1 capital (to average assets): For Capital Adequacy Purposes Amount	$ 724,519	$ 578,398
Tier 1 capital (to average assets): For Capital Adequacy Purposes Ratio (as a percent)	4.00%	4.00%
MB Financial Bank
Total capital (to risk-weighted assets):
Total capital (to risk-weighted assets): Actual Amount	$ 1,812,202	$ 1,509,453
Total capital (to risk-weighted assets): Actual Ratio (as a percent)	11.26%	11.62%
Total capital (to risk-weighted assets): For Capital Adequacy Purposes Amount	$ 1,287,099	$ 1,039,129
Total capital (to risk-weighted assets): For Capital Adequacy Purposes Ratio (as a percent)	8.00%	8.00%
Total capital (to risk-weighted assets): To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 1,608,874	$ 1,298,911
Total capital (to risk-weighted assets): To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	10.00%	10.00%
Tier 1 capital (to risk-weighted assets):
Tier 1 capital (to risk-weighted assets): Actual Amount	$ 1,670,360	$ 1,377,945
Tier 1 capital (to risk-weighted assets): Actual Ratio (as a percent)	10.38%	10.61%
Tier 1 capital (to risk-weighted assets): For Capital Adequacy Purposes Amount	$ 965,324	$ 779,347
Tier 1 capital (to risk-weighted assets): For Capital Adequacy Purposes Ratio (as a percent)	6.00%	6.00%
Tier 1 capital (to risk-weighted assets): To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 1,287,099	$ 1,039,129
Tier 1 capital (to risk-weighted assets): To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	8.00%	8.00%
Common equity tier 1 capital (to risk-weighted assets):
Common equity tier 1 capital (to risk-weighted assets): Actual Amount	$ 1,670,360	$ 1,377,945
Common equity tier 1 capital (to risk-weighted assets): Actual Ratio (as a percent)	10.38%	10.61%
Common equity tier 1 capital (to risk-weighted assets): For Capital Adequacy Purposes Amount	$ 723,993	$ 584,510
Common equity tier 1 capital (to risk-weighted assets): For Capital Adequacy Purposes Ratio (as a percent)	4.50%	4.50%
Common equity tier 1 capital (to risk-weighted assets): To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 1,045,768	$ 844,292
Common equity tier 1 capital (to risk-weighted assets): To Be Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	6.50%	6.50%
Tier 1 capital (to average assets):
Tier 1 capital (to average assets): Actual Amount	$ 1,670,360	$ 1,377,945
Tier 1 capital (to average assets): Actual Ratio (as a percent)	9.25%	9.54%
Tier 1 capital (to average assets): For Capital Adequacy Purposes Amount	$ 721,954	$ 577,999
Tier 1 capital (to average assets): For Capital Adequacy Purposes Ratio (as a percent)	4.00%	4.00%
Tier 1 capital (to average assets): To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 902,442	$ 722,499
Tier 1 capital (to average assets): 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, 2016	Dec. 31, 2015
Financial assets
Securities available for sale, at fair value		$ 1,696,195	$ 1,585,023
Loans held for sale		716,883	744,727
Total loans, excluding purchased credit impaired loans		12,605,726	9,652,592
Mortgage servicing rights		238,011	168,162
Derivative financial instruments		22,833	10,062
Financial liabilities
Derivative financial instruments		53,497	34,338
U.S. Government sponsored agencies and enterprises
Financial assets
Securities available for sale, at fair value		23,415	64,611
States and political subdivisions
Financial assets
Securities available for sale, at fair value		391,365	396,367
Residential mortgage-backed securities
Financial assets
Securities available for sale, at fair value		983,684	763,549
Commercial mortgage-backed securities
Financial assets
Securities available for sale, at fair value		93,008	130,107
Corporate bonds
Financial assets
Securities available for sale, at fair value		193,895	219,628
Equity securities
Financial assets
Securities available for sale, at fair value		10,828	10,761
Recurring basis
Financial assets
Loans held for sale		716,883	744,727
Total loans, excluding purchased credit impaired loans		16,273	25,869
Mortgage servicing rights		238,011	168,162
Assets held in trust for deferred compensation		18,723	16,820
Derivative financial instruments		44,586	42,846
Financial liabilities
Other liabilities	[1]	18,723	16,333
Derivative financial instruments		63,885	36,974
Recurring basis | U.S. Government sponsored agencies and enterprises
Financial assets
Securities available for sale, at fair value		23,415	64,611
Recurring basis | States and political subdivisions
Financial assets
Securities available for sale, at fair value		391,365	396,367
Recurring basis | Residential mortgage-backed securities
Financial assets
Securities available for sale, at fair value		983,684	763,549
Recurring basis | Commercial mortgage-backed securities
Financial assets
Securities available for sale, at fair value		93,008	130,107
Recurring basis | Corporate bonds
Financial assets
Securities available for sale, at fair value		193,895	219,628
Recurring basis | Equity securities
Financial assets
Securities available for sale, at fair value		10,828	10,761
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets
Securities available for sale, at fair value		10,828	10,761
Loans held for sale		0	0
Assets held in trust for deferred compensation		18,723	16,820
Derivative financial instruments		7,687	5,118
Financial liabilities
Other liabilities	[1]	18,723	16,333
Derivative financial instruments		2,046	6,050
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities
Financial assets
Securities available for sale, at fair value		10,828	10,761
Recurring basis | Significant Other Observable Inputs (Level 2)
Financial assets
Securities available for sale, at fair value		1,684,823	1,573,489
Loans held for sale		716,883	744,727
Total loans, excluding purchased credit impaired loans		16,273	25,869
Derivative financial instruments		33,739	33,906
Financial liabilities
Derivative financial instruments		61,839	30,924
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. Government sponsored agencies and enterprises
Financial assets
Securities available for sale, at fair value		23,415	64,611
Recurring basis | Significant Other Observable Inputs (Level 2) | States and political subdivisions
Financial assets
Securities available for sale, at fair value		390,992	395,950
Recurring basis | Significant Other Observable Inputs (Level 2) | Residential mortgage-backed securities
Financial assets
Securities available for sale, at fair value		983,513	763,193
Recurring basis | Significant Other Observable Inputs (Level 2) | Commercial mortgage-backed securities
Financial assets
Securities available for sale, at fair value		93,008	130,107
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate bonds
Financial assets
Securities available for sale, at fair value		193,895	219,628
Recurring basis | Significant Unobservable Inputs (Level 3)
Financial assets
Securities available for sale, at fair value		544	773
Loans held for sale		0	0
Mortgage servicing rights		238,011	168,162
Derivative financial instruments		3,160	3,822
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		373	417
Recurring basis | Significant Unobservable Inputs (Level 3) | Residential mortgage-backed securities
Financial assets
Securities available for sale, at fair value		$ 171	$ 356
[1]	Liabilities associated with assets held in trust for deferred compensation

Fair Value Measurements (Det105

Fair Value Measurements (Details 2) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and a Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	$ 1,696,195,000	$ 1,585,023,000
Mortgage servicing rights, at fair value	238,011,000	168,162,000
Derivative financial instruments	22,833,000	10,062,000
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	391,365,000	396,367,000
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	983,684,000	763,549,000
Recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and a Nonrecurring Basis [Line Items]
Mortgage servicing rights, at fair value	238,011,000	168,162,000
Derivative financial instruments	44,586,000	42,846,000
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	391,365,000	396,367,000
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	983,684,000	763,549,000
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	544,000	773,000
Mortgage servicing rights, at fair value	238,011,000	168,162,000
Derivative financial instruments	3,160,000	3,822,000
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	$ 373,000	417,000
Credit assumption (as a percent)	0.50%
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	$ 171,000	$ 356,000
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)	7.00%
Weighted average discount rate	9.50%
Maturity period (in months)	323 months
Weighted average delinquency rate	0.51%
Weighted average costs to service	$ 66
Additive delinquent costs to service	$ 175
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	70.00%
Expected delivery price	0.9713%
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)	8.30%
Weighted average discount rate	12.00%
Maturity period (in months)	357 months
Weighted average delinquency rate	3.87%
Weighted average costs to service	$ 226
Additive delinquent costs to service	$ 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	1.0885%

Fair Value Measurements (Det106

Fair Value Measurements (Details 3) - Mortgage Servicing Rights	12 Months Ended
	Dec. 31, 2016USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Impact on fair value of 10% adverse change	$ (7,409,000)
Impact on fair value of 20% adverse change	(14,415,000)
Impact on fair value of 10% adverse change	(10,159,000)
Impact on fair value of 20% adverse change	(19,521,000)
Impact on fair value of 10% adverse change	(2,393,000)
Impact on fair value of 20% adverse change	(4,248,000)
Impact on fair value of 10% adverse change	(4,546,000)
Impact on fair value of 20% adverse change	$ (9,093,000)
Weighted Average
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Weighted average prepayment speed (CPR)	7.50%
Weighted average discount rate	9.80%
Weighted average delinquency rate	2.14%
Weighted average costs to service	$ 90

Fair Value Measurements (Det107

Fair Value Measurements (Details 4) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Percentage of allowance for impaired real estate loans	100.00%
Securities Investment
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at the beginning of the period	$ 773	$ 973
Acquired through business combination	0	0
Purchases	0	0
Originations	0	0
Included in earnings	0	0
Principal payments	(229)	(200)
Sales	0	0
Balance at the end of the period	544	773
Mortgage Servicing Rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at the beginning of the period	168,162	235,402
Acquired through business combination	0	0
Purchases	5,087	823
Originations	68,428	68,690
Included in earnings	(3,666)	(33,648)
Principal payments	0	0
Sales	0	(103,105)
Balance at the end of the period	238,011	168,162
Derivatives
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at the beginning of the period	3,822	5,074
Acquired through business combination	146	0
Purchases	0	0
Originations	0	0
Included in earnings	(808)	(1,252)
Principal payments	0	0
Sales	0	0
Balance at the end of the period	$ 3,160	$ 3,822

Fair Value Measurements (Det108

Fair Value Measurements (Details 5) - Nonrecurring basis - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Financial Assets:
Impaired loans	$ 54,576	$ 76,203
Foreclosed assets	31,607	42,351
Significant Unobservable Inputs (Level 3)
Financial Assets:
Impaired loans	54,576	76,203
Foreclosed assets	$ 31,607	$ 42,351
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 (Det109

Fair Value Measurements (Details 6) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
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	$ 364,783	$ 307,869
Interest bearing deposits with banks	98,686	73,572
Securities available for sale, at fair value	1,696,195	1,585,023
Investment securities held to maturity	1,093,740	1,274,767
Non-marketable securities - FHLB and FRB stock	143,276	114,233
Loans held for sale	716,883	744,727
Derivative financial instruments	22,833	10,062
Financial Liabilities:
Non-interest bearing deposits	6,408,169	4,627,184
Interest bearing deposits	7,702,279	6,878,031
Short-term borrowings	1,569,288	1,005,737
Junior subordinated notes issued to capital trusts	210,668	186,164
Derivative financial instruments	53,497	34,338
Carrying Amount
Financial Assets:
Cash and due from banks	364,783	307,869
Interest bearing deposits with banks	98,686	73,572
Securities available for sale, at fair value	1,696,195	1,585,023
Investment securities held to maturity	1,069,750	1,230,810
Non-marketable securities - FHLB and FRB stock	143,276	114,233
Loans held for sale	716,883	744,727
Loans, net	12,629,437	9,665,858
Accrued interest receivable	59,024	53,457
Derivative financial instruments	44,586	42,846
Financial Liabilities:
Non-interest bearing deposits	6,408,169	4,627,184
Interest bearing deposits	7,702,279	6,878,031
Short-term borrowings	1,569,288	1,005,737
Long-term borrowings	311,790	400,274
Junior subordinated notes issued to capital trusts	210,668	186,164
Accrued interest payable	4,288	3,186
Derivative financial instruments	63,885	36,974
Estimated Fair Value
Financial Assets:
Cash and due from banks	364,783	307,869
Interest bearing deposits with banks	98,686	73,572
Securities available for sale, at fair value	1,696,195	1,585,023
Investment securities held to maturity	1,093,740	1,274,767
Non-marketable securities - FHLB and FRB stock	143,276	114,233
Loans held for sale	716,883	744,727
Loans, net	12,747,107	9,626,344
Accrued interest receivable	59,024	53,457
Derivative financial instruments	44,586	42,846
Financial Liabilities:
Non-interest bearing deposits	6,408,169	4,627,184
Interest bearing deposits	7,698,839	6,875,411
Short-term borrowings	1,569,314	1,005,705
Long-term borrowings	317,028	401,539
Junior subordinated notes issued to capital trusts	157,098	122,696
Accrued interest payable	4,288	3,186
Derivative financial instruments	63,885	36,974
Recurring basis
Financial Assets:
Loans held for sale	716,883	744,727
Derivative financial instruments	44,586	42,846
Financial Liabilities:
Derivative financial instruments	63,885	36,974
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial Assets:
Cash and due from banks	364,783	307,869
Interest bearing deposits with banks	98,686	73,572
Securities available for sale, at fair value	10,828	10,761
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	59,024	53,457
Derivative financial instruments	7,687	5,118
Financial Liabilities:
Non-interest bearing deposits	6,408,169	4,627,184
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	4,288	3,186
Derivative financial instruments	2,046	6,050
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	1,684,823	1,573,489
Investment securities held to maturity	1,093,740	1,274,767
Non-marketable securities - FHLB and FRB stock	0	0
Loans held for sale	716,883	744,727
Loans, net	16,273	25,869
Accrued interest receivable	0	0
Derivative financial instruments	33,739	33,906
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	61,839	30,924
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	544	773
Investment securities held to maturity	0	0
Non-marketable securities - FHLB and FRB stock	143,276	114,233
Loans held for sale	0	0
Loans, net	12,730,834	9,600,475
Accrued interest receivable	0	0
Derivative financial instruments	3,160	3,822
Financial Liabilities:
Non-interest bearing deposits	0	0
Interest bearing deposits	7,698,839	6,875,411
Short-term borrowings	1,569,314	1,005,705
Long-term borrowings	317,028	401,539
Junior subordinated notes issued to capital trusts	157,098	122,696
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, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	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		$ 16,868	$ 14,123	$ 8,974
Amount of related income tax benefit recognized in income		$ 8,983	$ 5,515	$ 3,528
Stock-based compensation
Numerator of shares granted beyond threshold limit (in shares)		2
Omnibus Incentive Plan (the "Omnibus Plan")
Stock-based compensation
Additional authorized shares (in shares)	3,100,000
Common shares authorized for issuance (in shares)	11,400,000
Percentage of shares authorized for issuance	10.00%
Minimum vesting period (in years)	3 years
Shares available for future grants (in shares)		3,811,383
Unrecognized compensation cost		$ 21,300
Expected weighted-average period for recognition of unrecognized compensation expense (in years)		2 years
Omnibus Incentive Plan (the "Omnibus Plan") | Taylor Capital Group, Inc.
Stock-based compensation
Common shares authorized for issuance (in shares)						13,800,000
Additional shares authorized (in shares)	2,400,000
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 and restricted stock units | Minimum
Stock-based compensation
Minimum vesting period (in years)		2 years
Restricted stock and restricted stock units | Maximum
Stock-based compensation
Minimum vesting period (in years)		4 years
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
Shares issued (in shares)		80,780	71,560	48,569	56,752
Performance based restricted units performance period (in years)		3 years
Share based compensation shares earned based on shares issued (percent)		175.00%
Share based compensation restricted stock units multiplier (in percent)		100.00%
Performance-based restricted stock units | Minimum
Stock-based compensation
Percentage of shares earned to number of units issued		0.00%
Performance-based restricted stock units | Maximum
Stock-based compensation
Percentage of shares earned to number of units issued		175.00%

Stock Incentive Plans (Details

Stock Incentive Plans (Details 2) - Stock options - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015
Number of Options
Options outstanding at the beginning of the period (in shares)		2,192,431
Granted (in shares)		405,678
Assumed (in shares)	[1]	107,344
Exercised (in shares)		(692,790)
Expired (in shares)		(36,341)
Forfeited or cancelled (in shares)		(35,917)
Options outstanding at the end of the period (in shares)		1,940,405	2,192,431
Options exercisable at end of the period (in shares)		1,230,520
Weighted Average Exercise Price
Options outstanding at the beginning of the period (in dollars per share)		$ 27.77
Granted (in dollars per share)		31.74
Assumed (in dollars per share)	[1]	19.74
Exercised (in dollars per share)		28.96
Expired (in dollars per share)		39.65
Forfeited or cancelled (in dollars per share)		31.03
Options outstanding at the end of the period (in dollars per share)		27.45	$ 27.77
Options exercisable at end of the period (in dollars per share)		$ 26.43
Weighted Average Remaining Contractual Term (in years)
Options outstanding		5 years 3 months 23 days	4 years 5 months 10 days
Options exercisable at end of the period		3 years 6 months 20 days
Aggregate Intrinsic Value (in thousands)
Options outstanding at the end of the period		$ 38,382
Options exercisable at the end of the period		$ 25,591
[1]	Reflects stock options assumed through the American Chartered merger.

Stock Incentive Plans (Detai112

Stock Incentive Plans (Details 3) - Stock options - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair value assumptions
Risk-free interest rate	1.44%	1.68%	1.82%
Expected volatility of Company’s stock	28.08%	29.66%	23.16%
Expected dividend yield	2.19%	1.82%	1.65%
Expected life of options (years)	5 years 6 months	5 years 8 months	5 years 6 months 10 days
Weighted average fair value per option of options granted during the year (in dollars per share)	$ 6.66	$ 7.77	$ 5.93
Intrinsic value of options exercised	$ 7	$ 1.7	$ 2

Stock Incentive Plans (Detai113

Stock Incentive Plans (Details 4) - Restricted stock and restricted stock units - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Number of Shares
Shares and Units Outstanding at the Beginning of the Period (in shares)		945,506
Granted (in shares)		483,467
Assumed (in shares)	[1]	5,191
Vested (in shares)		(409,550)
Forfeited or cancelled (in shares)		(25,807)
Shares and Units Outstanding at the End of the Period (in shares)		998,807	945,506
Weighted Average Grant Date Fair Value
Shares and Units Outstanding at the Beginning of the Period (in dollars per share)		$ 29.92
Granted (in dollars per share)		31.24
Assumed (in dollars per share)	[1]	32.45
Vested (in dollars per share)		28.40
Forfeited or cancelled (in dollars per share)		29.99
Shares and Units Outstanding at the at the end of the period (in dollars per share)		$ 31.20	$ 29.92
Intrinsic value of restricted shares vested		$ 15.9	$ 11.4	$ 8.6
[1]	Reflects restricted shares assumed through the American Chartered merger.

Derivative Financial Instrum114

Derivative Financial Instruments (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Net amount payable under interest rate swap		$ 1	$ 1
Interest rate swap credit risk exposure		15,500
Derivative [Line Items]
Asset Derivatives, Notional Amount		3,097,336	3,389,146
Asset Derivatives, Estimated Fair Value		44,586	42,846
Liability Derivatives, Notional Amount		3,467,875	2,419,933
Liability Derivatives, Estimated Fair Value		(63,885)	(36,974)
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Amounts of gain or (loss) recognized in income on derivatives		8,036	(12,480)	$ 1,583
Stand-alone derivative instruments
Derivative [Line Items]
Asset Derivatives, Notional Amount		3,097,336	3,389,146
Asset Derivatives, Estimated Fair Value		44,586	42,846
Liability Derivatives, Notional Amount		3,467,768	2,419,779
Liability Derivatives, Estimated Fair Value		(63,881)	(36,965)
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Amounts of gain or (loss) recognized in income on derivatives		8,031	(12,486)	1,575
Commercial loan interest rate swaps
Derivative [Line Items]
Liability Derivatives, Notional Amount		107
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]	107	154
Liability Derivatives, Estimated Fair Value	[1]	(4)	(9)
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Amounts of gain or (loss) recognized in income on derivatives		5	6	8
Interest rate swap contracts | Stand-alone derivative instruments
Derivative [Line Items]
Asset Derivatives, Notional Amount	[2]	1,310,057	1,034,298
Asset Derivatives, Estimated Fair Value	[2]	25,471	27,856
Liability Derivatives, Notional Amount	[2]	1,310,057	1,025,186
Liability Derivatives, Estimated Fair Value	[2]	(25,471)	(27,899)
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Amounts of gain or (loss) recognized in income on derivatives		7,571	404	2,458
Interest rate swap contracts | Stand-alone derivative instruments | Mortgage Banking
Derivative [Line Items]
Asset Derivatives, Notional Amount	[2]	383,000	898,000
Asset Derivatives, Estimated Fair Value	[2]	2,946	4,928
Liability Derivatives, Notional Amount	[2]	1,458,000	665,000
Liability Derivatives, Estimated Fair Value	[2]	(31,212)	(3,723)
Interest rate options contracts | Stand-alone derivative instruments
Derivative [Line Items]
Asset Derivatives, Notional Amount	[2]	217,546	222,585
Asset Derivatives, Estimated Fair Value	[2]	881	628
Liability Derivatives, Notional Amount	[2]	217,546	190,622
Liability Derivatives, Estimated Fair Value	[2]	(881)	(585)
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Amounts of gain or (loss) recognized in income on derivatives		36	43	0
Treasury futures contracts | Stand-alone derivative instruments | Mortgage Banking
Derivative [Line Items]
Asset Derivatives, Notional Amount	[2]	15,500	0
Asset Derivatives, Estimated Fair Value	[2]	41	0
Liability Derivatives, Notional Amount	[2]	0	0
Liability Derivatives, Estimated Fair Value	[2]	0	0
TBA mortgage securities | Stand-alone derivative instruments | Mortgage Banking
Derivative [Line Items]
Asset Derivatives, Notional Amount	[2]	0	35,000
Asset Derivatives, Estimated Fair Value	[2]	0	33
Liability Derivatives, Notional Amount	[2]	55,000	0
Liability Derivatives, Estimated Fair Value	[2]	(132)	0
Foreign exchange contracts | Stand-alone derivative instruments
Derivative [Line Items]
Asset Derivatives, Notional Amount	[2]	40,641	72,529
Asset Derivatives, Estimated Fair Value	[2]	4,429	3,970
Liability Derivatives, Notional Amount	[2]	40,505	63,339
Liability Derivatives, Estimated Fair Value	[2]	(4,265)	(3,671)
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Amounts of gain or (loss) recognized in income on derivatives		970	149	96
Spot foreign exchange contracts | Stand-alone derivative instruments
Derivative [Line Items]
Asset Derivatives, Notional Amount	[2]	1,691	328
Asset Derivatives, Estimated Fair Value	[2]	12	5
Liability Derivatives, Notional Amount	[2]	660	132
Liability Derivatives, Estimated Fair Value	[2]	(5)	0
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Amounts of gain or (loss) recognized in income on derivatives		963	18	(14)
Forward loan sale commitments | Stand-alone derivative instruments | Mortgage Banking
Derivative [Line Items]
Asset Derivatives, Notional Amount	[2]	585,000	503,500
Asset Derivatives, Estimated Fair Value	[2]	7,646	1,604
Liability Derivatives, Notional Amount	[2]	386,000	475,500
Liability Derivatives, Estimated Fair Value	[2]	(1,915)	(1,087)
Interest rate lock commitments | Stand-alone derivative instruments | Mortgage Banking
Derivative [Line Items]
Asset Derivatives, Notional Amount	[2]	543,901	622,906
Asset Derivatives, Estimated Fair Value	[2]	3,160	3,822
Liability Derivatives, Notional Amount	[2]	0	0
Liability Derivatives, Estimated Fair Value	[2]	0	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		$ (1,509)	$ (13,100)	$ (965)
[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.

Derivative Financial Instrum115

Derivative Financial Instruments (Details 2) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Financial Assets, Gross Amount Recognized	$ 22,833	$ 10,062
Financial Assets, Gross Amount Offset	0	0
Financial Assets, Net Amount Recognized	22,833	10,062
Financial Liabilities, Gross Amount Recognized	53,497	34,338
Financial Liabilities, Gross Amount Offset	0	0
Financial Liabilities, Net Amount Recognized	53,497	34,338
Repurchase Agreements, Financial Assets, Gross Amount Recognized	0	0
Repurchase Agreements And Securities Loaned, Asset	0	0
Repurchase Agreements, Financial Assets, Net Amount Recognized	0	0
Repurchase Agreements, Financial Liabilities, Gross Amount Recognized	237,538	201,207
Repurchase Agreements, Financial Liabilities, Gross Amount Offset	0	0
Repurchase Agreements, Financial Liabilities, Net Amount Recognized	237,538	201,207
Total Financial Assets, Gross Amount Recognized	22,833	10,062
Total Financial Assets, Gross Amount Offset	0	0
Total Financial Assets, Net Amount Recognized	22,833	10,062
Total Financial Liabilities, Gross Amount Recognized	291,035	235,545
Total Financial Liabilities, Gross Amount Offset	0	0
Total Financial Liabilities, Net Amount Recognized	291,035	235,545
Interest rate swaps, caps and floors
Derivative [Line Items]
Financial Assets, Gross Amount Recognized	7,885	5,698
Financial Assets, Gross Amount Offset	0	0
Financial Assets, Net Amount Recognized	7,885	5,698
Financial Liabilities, Gross Amount Recognized	18,564	31,446
Financial Liabilities, Gross Amount Offset	0	0
Financial Liabilities, Net Amount Recognized	18,564	31,446
Foreign currency forward contracts
Derivative [Line Items]
Financial Assets, Gross Amount Recognized	4,315	2,728
Financial Assets, Gross Amount Offset	0	0
Financial Assets, Net Amount Recognized	4,315	2,728
Financial Liabilities, Gross Amount Recognized	1,674	1,805
Financial Liabilities, Gross Amount Offset	0	0
Financial Liabilities, Net Amount Recognized	1,674	1,805
Mortgage related derivatives
Derivative [Line Items]
Financial Assets, Gross Amount Recognized	10,633	1,636
Financial Assets, Gross Amount Offset	0	0
Financial Assets, Net Amount Recognized	10,633	1,636
Financial Liabilities, Gross Amount Recognized	33,259	1,087
Financial Liabilities, Gross Amount Offset	0	0
Financial Liabilities, Net Amount Recognized	$ 33,259	$ 1,087

Derivative Financial Instrum116

Derivative Financial Instruments (Details 3) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Financial Assets, Net Amount Recognized	$ 22,833	$ 10,062
Financial Assets, Financial Instruments	(18,382)	(9,523)
Financial Assets, Collateral	0	0
Financial Assets, Net Amount	4,451	539
Financial Liabilities, Net Amount Recognized	53,497	34,338
Financial Liabilities, Financial Instruments	(18,382)	(9,523)
Financial Liabilities, Collateral	(35,104)	(24,649)
Financial Liabilities, Net Amount	11	166
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	237,538	201,207
Repurchase Agreements, Financial Liabilities, Financial Instruments	0	0
Repurchase Agreements, Financial Liabilities, Collateral	(237,538)	(201,207)
Repurchase Agreements, Financial Liabilities, Net Amount	0	0
Total Financial Assets, Net Amount Recognized	22,833	10,062
Total Financial Assets, Financial Instruments	(18,382)	(9,523)
Total Financial Assets, Collateral	0	0
Total Financial Assets, Net Amount	4,451	539
Total Financial Liabilities, Net Amount Recognized	291,035	235,545
Total Financial Liabilities, Financial Instruments	(18,382)	(9,523)
Total Financial Liabilities, Collateral	(272,642)	(225,856)
Total Financial Liabilities, Net Amount	11	166
Counterparty A
Derivative [Line Items]
Financial Assets, Net Amount Recognized	2,697	3,810
Financial Assets, Financial Instruments	(2,697)	(3,810)
Financial Assets, Collateral	0	0
Financial Assets, Net Amount	0	0
Financial Liabilities, Net Amount Recognized	18,768	11,137
Financial Liabilities, Financial Instruments	(2,697)	(3,810)
Financial Liabilities, Collateral	(16,071)	(7,327)
Financial Liabilities, Net Amount	0	0
Counterparty B
Derivative [Line Items]
Financial Assets, Net Amount Recognized	4,683	6
Financial Assets, Financial Instruments	(4,683)	(6)
Financial Assets, Collateral	0	0
Financial Assets, Net Amount	0	0
Financial Liabilities, Net Amount Recognized	12,881	7,808
Financial Liabilities, Financial Instruments	(4,683)	(6)
Financial Liabilities, Collateral	(8,198)	(7,802)
Financial Liabilities, Net Amount	0	0
Counterparty C
Derivative [Line Items]
Financial Assets, Net Amount Recognized	64	3,477
Financial Assets, Financial Instruments	(64)	(3,477)
Financial Assets, Collateral	0	0
Financial Assets, Net Amount	0	0
Financial Liabilities, Net Amount Recognized	4,919	4,963
Financial Liabilities, Financial Instruments	(64)	(3,477)
Financial Liabilities, Collateral	(4,855)	(1,486)
Financial Liabilities, Net Amount	0	0
Other counterparties
Derivative [Line Items]
Financial Assets, Net Amount Recognized	15,389	2,769
Financial Assets, Financial Instruments	(10,938)	(2,230)
Financial Assets, Collateral	0	0
Financial Assets, Net Amount	4,451	539
Financial Liabilities, Net Amount Recognized	16,929	10,430
Financial Liabilities, Financial Instruments	(10,938)	(2,230)
Financial Liabilities, Collateral	(5,980)	(8,034)
Financial Liabilities, Net Amount	$ 11	$ 166

Operating Segments (Details)

Operating Segments (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)segment		Dec. 31, 2015USD ($)		Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment	3
Segment Reporting Information [Line Items]
Net interest income	$ 517,891		$ 465,606		$ 350,823
Provision for credit losses	19,563		21,386		12,052
Non-interest income	374,903		322,093		221,305
Non-interest expense	619,851	[1]	534,154	[1]	436,782
Income tax expense	79,244		73,211		37,193
Net income	174,136		158,948		86,101
Total assets	19,302,317		15,585,007		14,602,099
Banking
Segment Reporting Information [Line Items]
Net interest income	475,133		424,883		328,326
Provision for credit losses	18,583		19,436		12,022
Non-interest income	153,250		127,710		115,411
Non-interest expense	421,733	[1]	355,727	[1]	350,358
Income tax expense	53,263		51,647		21,106
Net income	134,804		125,783		60,251
Total assets	16,368,881		13,243,710		12,698,740
Leasing
Segment Reporting Information [Line Items]
Net interest income	9,415		11,475		12,783
Provision for credit losses	295		1,598		35
Non-interest income	73,503		76,943		59,806
Non-interest expense	48,450	[1]	45,364	[1]	39,525
Income tax expense	13,525		16,255		12,524
Net income	20,648		25,201		20,505
Total assets	1,224,169		1,015,918		930,748
Mortgage Banking
Segment Reporting Information [Line Items]
Net interest income	33,343		29,248		9,714
Provision for credit losses	685		352		(5)
Non-interest income	148,150		117,440		46,088
Non-interest expense	149,668	[1]	133,063	[1]	46,899
Income tax expense	12,456		5,309		3,563
Net income	18,684		7,964		5,345
Total assets	1,709,267		1,325,379		972,611
Taylor Capital Group, Inc.
Segment Reporting Information [Line Items]
Merger expenses, banking segment					34,800	$ 2,500
Taylor Capital Group, Inc. | Banking
Segment Reporting Information [Line Items]
Merger expenses, banking segment	$ 23,700		$ 5,500		$ 45,400
[1]	Includes merger related expenses of $23.7 million, $5.5 million and $45.4 million in the banking segment for the years ended December 31, 2016, 2015 and 2014, respectively. Also, includes contingent consideration expense related to our acquisition of Celtic Leasing Corp. in the banking segment for the year ended December 31, 2016 and 2014.

Condensed Parent Company Fin118

Condensed Parent Company Financial Information (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Assets
Cash	$ 463,469	$ 381,441	$ 312,081	$ 473,459
Other assets	443,832	297,948
Total assets	19,302,317	15,585,007	14,602,099
Liabilities and Stockholders’ Equity
Short-term borrowings	1,569,288	1,005,737
Long-term borrowings	311,790	400,274
Junior subordinated notes issued to capital trusts	210,668	186,164
Other liabilities	520,914	400,333
Total stockholders’ equity	2,579,209	2,087,284	2,028,286	1,326,682
Total liabilities and stockholders’ equity	19,302,317	15,585,007
MB Financial, Inc.
Assets
Cash	26,591	104,819	$ 32,161	$ 122,001
Investments in subsidiaries	2,718,821	2,147,396
Other assets	92,520	60,379
Total assets	2,837,932	2,312,594
Liabilities and Stockholders’ Equity
Short-term borrowings	10,000	25,000
Long-term borrowings	14,000	0
Junior subordinated notes issued to capital trusts	214,384	186,164
Other liabilities	20,339	14,146
Total stockholders’ equity	2,579,209	2,087,284
Total liabilities and stockholders’ equity	$ 2,837,932	$ 2,312,594

Condensed Parent Company Fin119

Condensed Parent Company Financial Information (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Parent Company Financial Information
Income before income taxes	$ 253,380	$ 232,159	$ 123,294
Income tax benefit	79,244	73,211	37,193
Net income	174,136	158,948	86,101
Dividends on preferred shares	8,009	8,000	4,000
Net income available to common stockholders	166,127	150,948	82,101
MB Financial, Inc.
Condensed Parent Company Financial Information
Dividends from subsidiaries	112,000	158,000	101,500
Interest and other income	1,913	469	3,097
Interest and other expense	14,990	10,637	14,636
Income before income taxes	98,923	147,832	89,961
Income tax benefit	(5,303)	(4,018)	(4,590)
Income before equity in undistributed net income of subsidiaries	104,226	151,850	94,551
Equity in undistributed net income (loss) of subsidiaries	69,910	7,098	(8,450)
Net income	174,136	158,948	86,101
Dividends on preferred shares	8,009	8,000	4,000
Net income available to common stockholders	$ 166,127	$ 150,948	$ 82,101

Condensed Parent Company Fin120

Condensed Parent Company Financial Information (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash Flows From Operating Activities
Net income	$ 174,136	$ 158,948	$ 86,101
Adjustments to reconcile net income to net cash provided by operating activities:
Compensation expense for share-based payment plans	16,868	14,123	8,974
Cash Flows From Investing Activities
Investments in and advances to subsidiaries	2,336	0	0
Net cash paid in business acquisition	(9,010)	(18,935)	25,174
Net cash (used in) provided by investing activities	(727,654)	(932,093)	674,561
Cash Flows From Financing Activities
Treasury stock transactions, net	(3,837)	(53,587)	(2,690)
Stock options exercised	1,410	499	1,034
Dividends paid on common stock	(58,177)	(48,413)	(34,210)
Dividends paid on preferred stock	(8,009)	(8,000)	(2,000)
Principal paid on long-term borrowings	(71,845)	(22,232)	(13,059)
Net cash provided by (used in) financing activities	558,053	795,846	(1,003,782)
Net increase (decrease) in cash and cash equivalents	82,028	69,360	(161,378)
Cash:
Beginning of year	381,441	312,081	473,459
End of year	463,469	381,441	312,081
MB Financial, Inc.
Cash Flows From Operating Activities
Net income	174,136	158,948	86,101
Adjustments to reconcile net income to net cash provided by operating activities:
Compensation expense for share-based payment plans	16,868	14,123	8,974
Equity in undistributed net income of subsidiaries	(69,910)	(7,098)	8,450
Change in other assets and other liabilities	(28,546)	(8,814)	(8,584)
Net cash provided by operating activities	92,548	157,159	94,941
Cash Flows From Investing Activities
Investments in and advances to subsidiaries	2,000	0	0
Net cash paid in business acquisition	(83,163)	0	(101,546)
Net cash (used in) provided by investing activities	(85,163)	0	(101,546)
Cash Flows From Financing Activities
Treasury stock transactions, net	(3,837)	(53,587)	(2,690)
Stock options exercised	1,410	499	1,034
Dividends paid on common stock	(58,177)	(48,413)	(34,210)
Dividends paid on preferred stock	(8,009)	(8,000)	(2,000)
Net (decrease) increase short-term borrowings	(15,000)	25,000	0
Principal paid on long-term borrowings	(2,000)
Redemption of on junior subordinated notes issued to capital trusts	0	0	(45,369)
Net cash provided by (used in) financing activities	(85,613)	(84,501)	(83,235)
Net increase (decrease) in cash and cash equivalents	(78,228)	72,658	(89,840)
Cash:
Beginning of year	104,819	32,161	122,001
End of year	$ 26,591	$ 104,819	$ 32,161

Preferred Stock (Details)

Preferred Stock (Details)	Aug. 24, 2016$ / sharesshares	Aug. 18, 2014shares	Sep. 30, 2016shares	Dec. 31, 2016$ / sharesshares	Dec. 31, 2015$ / sharesshares
Series A Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares outstanding (in shares)				4,000,000	4,000,000
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares				$ 25	$ 25
Preferred stock, dividend rate (percent)				8.00%	8.00%
Series A Preferred Stock | Taylor Capital Group, Inc.
Class of Stock [Line Items]
Equity conversion ratio (in shares)		1
Preferred stock, shares outstanding (in shares)		4,000,000
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares				$ 25
Preferred stock, dividend rate (percent)				8.00%
Series B Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares outstanding (in shares)				125	0
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares				$ 1,000
Preferred stock, dividend rate (percent)				8.00%
Series B Preferred Stock | American Chartered Merger
Class of Stock [Line Items]
Equity conversion ratio (in shares)	1
Preferred stock, shares outstanding (in shares)	525
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares	$ 1,000
Preferred stock, dividend rate (percent)	8.00%
Conversion preferred stock to common stock			400