Old National Bancorp (ONB) 10-K 16 Feb 17 2016 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2016	Jan. 31, 2017	Jun. 30, 2016
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	FY
Trading Symbol	ONB
Entity Registrant Name	Old National Bancorp /IN/
Entity Central Index Key	707,179
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		135,198,000
Entity Public Float			$ 1,657,955,950

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Assets
Cash and due from banks	$ 209,381	$ 91,311
Money market and other interest-earning investments	46,138	128,507
Total cash and cash equivalents	255,519	219,818
Trading securities, at fair value	4,982	3,941
Investment securities - available-for-sale, at fair value	2,797,174	2,418,221
Investment securities - held-to-maturity, at amortized cost (fair value $784,172 and $929,417, respectively)	745,090	872,111
Federal Home Loan Bank/Federal Reserve Bank stock, at cost	101,716	86,146
Loans held for sale, at fair value	90,682	13,810
Loans, net of unearned income	9,010,512	6,840,818
Covered loans, net of discount		107,587
Total loans	9,010,512	6,948,405
Allowance for loan losses	(49,808)	(51,296)
Allowance for loan losses - covered loans		(937)
Net loans	8,960,704	6,896,172
FDIC indemnification asset		9,030
Premises and equipment, net	429,622	196,676
Accrued interest receivable	81,381	69,098
Goodwill	655,018	584,634
Other intangible assets	37,677	35,308
Company-owned life insurance	352,956	341,294
Net deferred tax assets	181,863	109,984
Loan servicing rights	25,561	10,468
Assets held for sale	5,970	5,679
Other real estate owned and repossessed personal property	18,546	7,594
Other real estate owned - covered		4,904
Other assets	115,776	106,639
Total assets	14,860,237	11,991,527
Deposits:
Noninterest-bearing demand	3,016,093	2,488,855
Interest-bearing:
NOW	2,596,595	2,133,536
Savings	2,954,709	2,201,352
Money market	707,748	577,050
Time	1,468,108	1,000,067
Total deposits	10,743,253	8,400,860
Federal funds purchased and interbank borrowings	213,003	291,090
Securities sold under agreements to repurchase	367,052	387,409
Federal Home Loan Bank advances	1,353,092	1,023,491
Other borrowings	218,939	218,256
Accrued expenses and other liabilities	150,481	179,251
Total liabilities	13,045,820	10,500,357
Commitments and contingencies (Note 23)
Shareholders' Equity
Preferred stock, series A, 2,000 shares authorized, no shares issued or outstanding
Common stock, $1.00 per share stated value, 300,000 shares authorized, 135,159 and 114,297 shares issued and outstanding, respectively	135,159	114,297
Capital surplus	1,348,338	1,087,911
Retained earnings	390,292	323,759
Accumulated other comprehensive income (loss), net of tax	(59,372)	(34,797)
Total shareholders' equity	1,814,417	1,491,170
Total liabilities and shareholders' equity	$ 14,860,237	$ 11,991,527

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Investment securities - held-to-maturity, fair value	$ 784,172	$ 929,417
Common stock, stated value	$ 1	$ 1
Authorized and unissued common shares reserved for issuance	300,000,000	300,000,000
Common stock, shares issued	135,159,000	114,297,000
Common stock, shares outstanding	135,159,000	114,297,000
Series A Preferred Stock [Member]
Preferred stock, shares authorized	2,000,000	2,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Loans including fees:
Taxable	$ 349,095,000	$ 304,452,000	$ 296,141,000
Nontaxable	12,287,000	11,566,000	10,207,000
Investment securities:
Taxable	57,005,000	57,336,000	60,903,000
Nontaxable	28,617,000	25,788,000	22,436,000
Money market and other interest-earning investments	130,000	47,000	42,000
Total interest income	447,134,000	399,189,000	389,729,000
Interest Expense
Deposits	17,283,000	14,168,000	13,326,000
Federal funds purchased and interbank borrowings	673,000	265,000	136,000
Securities sold under agreements to repurchase	1,509,000	1,488,000	1,434,000
Federal Home Loan Bank advances	15,547,000	8,121,000	4,275,000
Other borrowings	9,419,000	9,031,000	4,188,000
Total interest expense	44,431,000	33,073,000	23,359,000
Net interest income	402,703,000	366,116,000	366,370,000
Provision for loan losses	960,000	2,923,000	3,097,000
Net interest income after provision for loan losses	401,743,000	363,193,000	363,273,000
Noninterest Income
Wealth management fees	34,641,000	34,395,000	28,737,000
Service charges on deposit accounts	41,578,000	43,372,000	47,433,000
Debit card and ATM fees	16,769,000	21,340,000	25,835,000
Mortgage banking revenue	20,240,000	12,540,000	6,017,000
Insurance premiums and commissions	20,527,000	42,714,000	41,466,000
Investment product fees	18,822,000	17,924,000	17,136,000
Company-owned life insurance	8,479,000	8,604,000	6,924,000
Net securities gains	5,848,000	5,718,000	9,830,000
Total other-than-temporary impairment losses	0	0	(100,000)
Loss recognized in other comprehensive income	0	0	0
Impairment losses recognized in earnings			(100,000)
Recognition of deferred gain on sale leaseback transactions	16,057,000	16,444,000	6,094,000
Gain on sale of ONB Insurance Group, Inc.	41,864,000
Net gain on branch divestitures		15,627,000
Change in FDIC indemnification asset	233,000	(9,034,000)	(43,162,000)
Other income	27,772,000	20,988,000	18,919,000
Total noninterest income	252,830,000	230,632,000	165,129,000
Noninterest Expense
Salaries and employee benefits	252,892,000	243,875,000	219,301,000
Occupancy	50,947,000	53,239,000	49,099,000
Equipment	13,448,000	13,183,000	12,453,000
Marketing	14,620,000	10,410,000	9,591,000
Data processing	32,002,000	27,309,000	25,382,000
Communication	9,959,000	9,586,000	10,476,000
Professional fees	15,705,000	11,756,000	16,390,000
Loan expense	7,632,000	6,373,000	6,107,000
Supplies	2,865,000	2,275,000	2,958,000
FDIC assessment	8,681,000	7,503,000	6,261,000
Other real estate owned expense	4,195,000	2,703,000	3,101,000
Amortization of intangibles	12,486,000	11,746,000	9,120,000
Other expense	28,715,000	30,974,000	16,199,000
Total noninterest expense	454,147,000	430,932,000	386,438,000
Income before income taxes	200,426,000	162,893,000	141,964,000
Income tax expense	66,162,000	46,177,000	38,297,000
Net income	$ 134,264,000	$ 116,716,000	$ 103,667,000
Net income per common share - basic	$ 1.05	$ 1.01	$ 0.96
Net income per common share - diluted	$ 1.05	$ 1	$ 0.95
Weighted average number of common shares outstanding - basic	127,705	115,726	107,818
Weighted average number of common shares outstanding - diluted	128,301	116,255	108,365
Dividends per common share	$ 0.52	$ 0.48	$ 0.44

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 134,264,000	$ 116,716,000	$ 103,667,000
Change in securities available-for-sale:
Unrealized holding gains (losses) for the period	(49,813,000)	1,173,000	42,515,000
Reclassification adjustment for securities gains realized in income	(5,848,000)	(5,718,000)	(9,830,000)
Other-than-temporary-impairment on available-for-sale securities associated with credit loss realized in income	0	0	100,000
Income tax effect	20,455,000	1,487,000	(12,425,000)
Unrealized gains (losses) on available-for-sale securities	(35,206,000)	(3,058,000)	20,360,000
Change in securities held-to-maturity:
Amortization of fair value for securities held-to-maturity previously recognized into accumulated other comprehensive income	1,776,000	1,692,000	1,437,000
Income tax effect	(606,000)	(396,000)	(446,000)
Changes from securities held-to-maturity	1,170,000	1,296,000	991,000
Cash flow hedges:
Net unrealized derivative losses on cash flow hedges	(2,323,000)	(8,107,000)	(9,514,000)
Reclassification adjustment for losses realized in net income	6,453,000	2,719,000	248,000
Income tax effect	(1,569,000)	2,047,000	3,521,000
Changes from cash flow hedges	2,561,000	(3,341,000)	(5,745,000)
Defined benefit pension plans:
Amortization of net (gain) loss and settlement cost recognized in income	11,203,000	3,002,000	(4,333,000)
Income tax effect	(4,303,000)	(1,141,000)	1,638,000
Changes from defined benefit pension plans	6,900,000	1,861,000	(2,695,000)
Other comprehensive income (loss), net of tax	(24,575,000)	(3,242,000)	12,911,000
Comprehensive income	$ 109,689,000	$ 113,474,000	$ 116,578,000

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Tower Financial Corporation [Member]	United Bancorp, Inc. [Member]	LSB Financial Corp. [Member]	Founders Financial Corporation [Member]	Anchor BanCorp Wisconsin Inc. [Member]	Common Stock [Member]	Common Stock [Member]Tower Financial Corporation [Member]	Common Stock [Member]United Bancorp, Inc. [Member]	Common Stock [Member]LSB Financial Corp. [Member]	Common Stock [Member]Founders Financial Corporation [Member]	Common Stock [Member]Anchor BanCorp Wisconsin Inc. [Member]	Capital Surplus [Member]	Capital Surplus [Member]Tower Financial Corporation [Member]	Capital Surplus [Member]United Bancorp, Inc. [Member]	Capital Surplus [Member]LSB Financial Corp. [Member]	Capital Surplus [Member]Founders Financial Corporation [Member]	Capital Surplus [Member]Anchor BanCorp Wisconsin Inc. [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance at Dec. 31, 2013	$ 1,162,640						$ 99,859						$ 900,254						$ 206,993	$ (44,466)
Net income	103,667																		103,667
Other comprehensive income (loss)	12,911																			12,911
Acquisition		$ 78,727	$ 123,806	$ 51,758				$ 5,626	$ 9,117	$ 3,557				$ 73,101	$ 114,689	$ 48,201
Dividends - common stock	(48,181)																		(48,181)
Common stock issued	326						24						302
Common stock repurchased	(25,830)						(1,886)						(23,944)
Stock based compensation expense	4,162												4,162
Stock activity under incentive compensation plans	1,778						550						1,527						(299)
Ending Balance at Dec. 31, 2014	1,465,764						116,847						1,118,292						262,180	(31,555)
Net income	116,716																		116,716
Other comprehensive income (loss)	(3,242)																			(3,242)
Acquisition					$ 50,626						$ 3,402						$ 47,224
Dividends - common stock	(55,552)																		(55,552)
Common stock issued	391						29						362
Common stock repurchased	(88,695)						(6,399)						(82,296)
Stock based compensation expense	4,255												4,255
Stock activity under incentive compensation plans	907						418						74						415
Ending Balance at Dec. 31, 2015	1,491,170						114,297						1,087,911						323,759	(34,797)
Net income	134,264																		134,264
Other comprehensive income (loss)	(24,575)																			(24,575)
Acquisition						$ 273,565						$ 20,415						$ 253,150
Dividends - common stock	(67,536)																		(67,536)
Common stock issued	388						32						356
Common stock repurchased	(2,044)						(154)						(1,890)
Stock based compensation expense	7,318												7,318
Stock activity under incentive compensation plans	1,867						569						1,493						(195)
Ending Balance at Dec. 31, 2016	$ 1,814,417						$ 135,159						$ 1,348,338						$ 390,292	$ (59,372)

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	$ 134,264	$ 116,716	$ 103,667
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation	16,558	14,101	12,366
Amortization of other intangible assets	12,486	11,746	9,120
Net premium amortization on investment securities	18,633	18,609	15,430
Amortization of and net gains on termination of FDIC indemnification asset	(458)	9,034	43,162
Stock compensation expense	7,318	4,255	4,162
Provision for loan losses	960	2,923	3,097
Net securities gains	(5,848)	(5,718)	(9,830)
Impairment on available-for-sale securities			100
Recognition of deferred gain on sale leaseback transactions	(16,057)	(16,444)	(6,094)
Gain on sale of ONB Insurance Group, Inc.	(41,864)
Net gain on branch divestitures		(15,627)
Net gains on sales of loans and other assets	(4,741)	(5,232)	(3,546)
Increase in cash surrender value of company-owned life insurance	(8,479)	(8,604)	(6,924)
Residential real estate loans originated for sale	(637,639)	(350,846)	(148,946)
Proceeds from sale of residential real estate loans	578,653	362,157	147,566
Increase in interest receivable	(4,974)	(7,523)	(4,731)
Decrease in other real estate owned	11,301	4,538	7,049
Decrease in other assets	46,462	16,079	19,309
Increase (decrease) in accrued expenses and other liabilities	(24,524)	(26,408)	14,392
Total adjustments	(52,213)	7,040	95,682
Net cash flows provided by operating activities	82,051	123,756	199,349
Cash Flows From Investing Activities
Cash portion of bank purchase price, net of cash acquired	(62,532)	(37,098)	(3,050)
Proceeds from sale of ONB Insurance Group, Inc.	91,771
Payments related to branch divestitures		(333,095)
Purchases of investment securities available-for-sale	(1,625,746)	(832,419)	(568,993)
Purchases of investment securities held-to-maturity		(74,862)	(103,299)
Purchases of Federal Home Loan Bank/Federal Reserve Bank stock	(10,974)	(21,872)	(6,901)
Proceeds from maturities, prepayments, and calls of investment securities available-for-sale	1,177,130	764,649	468,764
Proceeds from sales of investment securities available-for-sale	243,312	343,486	214,912
Proceeds from maturities, prepayments, and calls of investment securities held-to-maturity	120,954	39,799	16,189
Proceeds from sales of investment securities held-to-maturity		855
Proceeds from sales of Federal Home Loan Bank/Federal Reserve Bank stock		8,711	7,507
Reimbursements under FDIC loss share agreements	10,000	3,548	26,342
Net principal collected from (loans made to) loan customers	(427,686)	(285,875)	(196,287)
Proceeds from settlements on company-owned life insurance	4,095	1,224	371
Proceeds from sale of premises and equipment and other assets	6,332	7,714	2,755
Purchases of premises and equipment and other assets	(224,659)	(85,661)	(20,473)
Net cash flows used in investing activities	(698,003)	(500,896)	(162,163)
Cash Flows From Financing Activities
Deposits	489,680	89,328	(304,510)
Federal funds purchased and interbank borrowings	(78,087)	95,903	69,665
Securities sold under agreements to repurchase	(23,489)	(31,205)	(10,006)
Payments for maturities on Federal Home Loan Bank advances	(594,541)	(229,109)	(211,101)
Payments for maturities on other borrowings	(67)	(63)	(58)
Proceeds from Federal Home Loan Bank advances	925,000	575,000	350,000
Proceeds from issuance of other borrowings			175,000
Cash dividends paid on common stock	(67,536)	(55,552)	(48,181)
Common stock repurchased	(2,044)	(88,695)	(25,830)
Proceeds from exercise of stock options, including tax benefit	2,349	997	749
Common stock issued	388	391	326
Net cash flows provided by (used in) financing activities	651,653	356,995	(3,946)
Net increase (decrease) in cash and cash equivalents	35,701	(20,145)	33,240
Cash and cash equivalents at beginning of period	219,818	239,963	206,723
Cash and cash equivalents at end of period	$ 255,519	$ 219,818	$ 239,963

Nature of Operations

Nature of Operations	12 Months Ended
	Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations	NATURE OF OPERATIONS Old National Bancorp, a financial holding company headquartered in Evansville, Indiana, operates primarily in Indiana, Kentucky, Michigan, and Wisconsin. Its principal subsidiary is Old National Bank. Through its bank and non-bank affiliates, Old National Bancorp provides to its clients an array of financial services including loan, deposit, wealth management, investment consulting, and investment products.

Basis of Presentation and Signi

Basis of Presentation and Significant Accounting Policies	12 Months Ended
	Dec. 31, 2016
Accounting Policies [Abstract]
Basis of Presentation and Significant Accounting Policies	NOTE 1 – BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation The accompanying consolidated financial statements include the accounts of Old National Bancorp and its wholly-owned affiliates (hereinafter collectively referred to as “Old National”) and have been prepared in conformity with accounting principles generally accepted in the United States and prevailing practices within the banking industry. Such principles require management to make estimates and assumptions that affect the reported amounts of assets, liabilities, and the disclosures of contingent assets and liabilities at the date of the financial statements and amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. All significant intercompany transactions and balances have been eliminated. Certain prior year amounts have been reclassified to conform to the 2016 presentation. Such reclassifications had no effect on net income or shareholders’ equity and were insignificant amounts. Trading Securities Trading securities consist of mutual funds held in trusts associated with deferred compensation plans for former directors and executives. These mutual funds are recorded as trading securities at fair value. Gains and losses are included in net securities gains. Investment Securities Old National classifies investment securities as available-for-sale held-to-maturity available-for-sale held-to-maturity, available-for-sale Other-Than-Temporary Impairment Federal Home Loan Bank (“FHLB”) Stock Old National is a member of the FHLB system. Members are required to own a certain amount of stock based on the level of borrowings and other factors and may invest in additional amounts. FHLB stock is carried at cost, classified as a restricted security and periodically evaluated for impairment based on ultimate recovery of par value. Both cash and stock dividends are reported as income. Loans Held for Sale Loans that Old National has originated with a commitment to sell are classified as loans held for sale and are recorded in accordance with FASB ASC 825-10 Loans Loans that Old National intends to hold for investment purposes are classified as portfolio loans. Portfolio loans are carried at the principal balance outstanding, net of earned interest, purchase premiums or discounts, deferred loan fees and costs, and an allowance for loan losses. Interest income is accrued on the principal balances of loans outstanding. For all loan classes, a loan is generally placed on nonaccrual status when principal or interest becomes 90 days past due unless it is well secured and in the process of collection, or earlier when concern exists as to the ultimate collectibility of principal or interest. Interest accrued during the current year on such loans is reversed against earnings. Interest accrued in the prior year, if any, is charged to the allowance for loan losses. Cash interest received on these loans is applied to the principal balance until the principal is recovered or until the loan returns to accrual status. Loans may be returned to accrual status when all the principal and interest amounts contractually due are brought current, remain current for a prescribed period, and future payments are reasonably assured. Purchased loans acquired in a business combination are recorded at estimated fair value on their purchase date with no carryover of the related allowance for loan and lease losses. In determining the estimated fair value of purchased loans, management considers a number of factors including, among others, the remaining life of the acquired loans, estimated prepayments, estimated loss ratios, estimated value of the underlying collateral, and net present value of cash flows expected to be received. Purchased loans are accounted for in accordance with guidance for certain loans acquired in a transfer (ASC 310-30), non-accretable Allowance for Loan Losses The allowance for loan losses is maintained at a level believed adequate by management to absorb probable losses incurred in the consolidated loan portfolio. Management’s evaluation of the adequacy of the allowance is an estimate based on reviews of individual loans, pools of homogeneous loans, assessments of the impact of current and anticipated economic conditions on the portfolio, and historical loss experience. The allowance is increased through a provision charged to operating expense. Loans deemed to be uncollectible are charged to the allowance. Recoveries of loans previously charged-off For all loan classes, a loan is considered impaired when it is probable that contractual interest and principal payments will not be collected either for the amounts or by the dates as scheduled in the loan agreement. If a loan is impaired, a portion of the allowance is allocated so that the loan is reported net, at the present value of estimated cash flows using the loan’s existing rate or at the fair value of collateral if repayment is expected solely from the collateral. Old National’s policy, for all but purchased credit impaired loans, is to recognize interest income on impaired loans unless the loan is placed on nonaccrual status. Acquired loans accounted for under ASC Topic 310-30 re-estimation Old National charges off small commercial loans scored through our small business credit center with contractual balances under $250,000 that have been placed on nonaccrual status or became 90 days or more delinquent, without regard to the collateral position. For all portfolio segments, the general component covers non-impaired Further information regarding Old National’s policies and methodology used to estimate the allowance for loan losses is presented in Note 6. Premises and Equipment Premises and equipment are stated at cost less accumulated depreciation. Land is stated at cost. Depreciation is charged to operating expense over the useful lives of the assets, principally on the straight-line method. Useful lives for premises and equipment are as follows: buildings and building improvements – 15 to 39 years; and furniture and equipment – 3 to 10 years. Leasehold improvements are depreciated over the lesser of their useful lives or the term of the lease. Maintenance and repairs are expensed as incurred while major additions and improvements are capitalized. Interest costs on construction of qualifying assets are capitalized. Premises and equipment are reviewed for impairment when events indicate their carrying amount may not be recoverable from future undiscounted cash flows. If impaired, the assets are adjusted to fair value. Such impairments are included in other expense. Goodwill and Other Intangible Assets The excess of the cost of acquired entities over the fair value of identifiable assets acquired less liabilities assumed is recorded as goodwill. In accordance with FASB ASC 350 (SFAS No. 142, Goodwill and Other Intangible Assets Company-Owned Life Insurance Old National has purchased life insurance policies on certain key executives. Old National records company-owned life insurance at the amount that can be realized under the insurance contract at the balance sheet date, which is the cash surrender value adjusted for other charges or other amounts due that are probable at settlement. Company-owned life insurance totaled $353.0 million at December 31, 2016 and $341.3 million at December 31, 2015. Loan Servicing Rights When loans are sold with servicing retained, servicing rights are initially recorded at fair value with the income statement effect recorded in gain on sales of loans. Fair value is based on market prices for comparable servicing contracts, when available or alternatively, is based on a valuation model that calculates the present value of estimated future net servicing income. All classes of servicing assets are subsequently measured using the amortization method which requires servicing rights to be amortized into noninterest income in proportion to, and over the period of, the estimated future net servicing income of the underlying loans. Loan servicing rights are evaluated for impairment based upon the fair value of the rights as compared to carrying amount. Impairment is determined by stratifying rights into groupings based on predominant risk characteristics, such as interest rate, loan type, term, and investor type. Impairment is recognized through a valuation allowance for an individual grouping, to the extent that fair value is less than the carrying amount. If the Company later determines that all or a portion of the impairment no longer exists for a particular grouping, a reduction of the allowance may be recorded as an increase to income. Changes in valuation allowances are reported with mortgage banking revenue on the income statement. The fair values of servicing rights are subject to significant fluctuations as a result of changes in estimated and actual prepayment speeds and default rates and losses. Servicing fee income, which is reported on the income statement as mortgage banking revenue, is recorded for fees earned for servicing loans. The fees are based on a contractual percentage of the outstanding principal, or a fixed amount per loan and are recorded as income when earned. Derivative Financial Instruments As part of Old National’s overall interest rate risk management, Old National uses derivative instruments, including To Be Announced (“TBA”) forward agreements and interest rate swaps, caps, and floors. All derivative instruments are recognized on the balance sheet at their fair value in accordance with ASC 815, as amended. At the inception of the derivative contract, Old National will designate the derivative as (1) a hedge of the fair value of a recognized asset or liability or of an unrecognized firm commitment (“fair value hedge”), (2) a hedge of a forecasted transaction or of the variability of cash flows to be received or paid related to a recognized asset or liability (“cash flow hedge”), or (3) an instrument with no hedging designation (“stand-alone derivative”). For derivatives that are designated and qualify as a fair value hedge, the change in value of the derivative, as well as the offsetting change in value of the hedged item attributable to the hedged risk, are recognized in current earnings during the period of the change in fair values. For derivatives that are designated and qualify as a cash flow hedge, the effective portion of the change in value on the derivative is reported as a component of other comprehensive income and reclassified into earnings in the same period or periods during which the hedged transaction affects earnings. For all hedging relationships, changes in fair value of derivatives that are not effective in hedging the changes in fair value or expected cash flows of the hedged item are recognized immediately in current earnings during the period of the change. Similarly, the changes in the fair value of derivatives that do not qualify for hedge accounting under ASC Topic 815 are also reported currently in earnings, in noninterest income. The accrued net settlements on derivatives that qualify for hedge accounting are recorded in interest income or interest expense, consistent with the item being hedged. Old National formally documents all relationships between hedging instruments and hedged items, as well as its risk-management objective and strategy for undertaking various hedge transactions. This process includes linking all derivative instruments that are designated as fair-value or cash-flow hedges to specific assets and liabilities on the balance sheet or to specific firm commitments or forecasted transactions. Old National also formally assesses, both at the hedge’s inception and on an ongoing basis, whether the derivative instruments that are used in hedging transactions are highly effective in offsetting changes in fair values or cash flows of hedged items. Old National discontinues hedge accounting prospectively when it is determined that (1) the derivative is no longer effective in offsetting changes in the fair value or cash flows of the hedged item; (2) the derivative expires, is sold, or terminated; (3) the derivative instrument is de-designated When hedge accounting is discontinued, the future changes in fair value of the derivative are recorded as noninterest income. When a fair value hedge is discontinued, the hedged asset or liability is no longer adjusted for changes in fair value and the existing basis adjustment is amortized or accreted over the remaining life of the asset or liability. When a cash flow hedge is discontinued but the hedged cash flows or forecasted transaction is still expected to occur, changes in value that were accumulated in other comprehensive income are amortized or accreted into earnings over the same periods which the hedged transactions will affect earnings. Old National enters into various stand-alone mortgage-banking derivatives in order to hedge the risk associated with the fluctuation of interest rates. Changes in fair value are recorded as mortgage banking revenue. Old National also enters into various stand-alone derivative contracts to provide derivative products to customers which are carried at fair value with changes in fair value recorded as other noninterest income. Old National is exposed to losses if a counterparty fails to make its payments under a contract in which Old National is in the net receiving position. Old National anticipates that the counterparties will be able to fully satisfy their obligations under the agreements. In addition, Old National obtains collateral above certain thresholds of the fair value of its hedges for each counterparty based upon their credit standing. All of the contracts to which Old National is a party settle monthly, quarterly, or semiannually. Further, Old National has netting agreements with the dealers with which it does business. Credit-Related Financial Instruments In the ordinary course of business, Old National’s affiliate bank has entered into credit-related financial instruments consisting of commitments to extend credit, commercial letters of credit, and standby letters of credit. The notional amount of these commitments is not reflected in the consolidated financial statements until they are funded. Foreclosed Assets Other assets include real estate properties acquired as a result of foreclosure and repossessed personal property and are initially recorded at the fair value of the property less estimated cost to sell. Any excess recorded investment over the fair value of the property received is charged to the allowance for loan losses. Any subsequent write-downs are charged to expense, as are the costs of operating the properties. Foreclosed assets totaled $18.5 million at December 31, 2016 and $12.5 million at December 31, 2015. Securities Purchased Under Agreements to Resell and Securities Sold Under Agreements to Repuchase We purchase certain securities, generally U.S. government-sponsored entity and agency securities, under agreements to resell. The amounts advanced under these agreements represent short-term secured loans and are reflected as assets in the accompanying consolidated balance sheets. We also sell certain securities under agreements to repurchase. These agreements are treated as collateralized financing transactions. These secured borrowings are reflected as liabilities in the accompanying consolidated balance sheets and are recorded at the amount of cash received in connection with the transaction. Short-term securities sold under agreements to repurchase generally mature within one to four days from the transaction date. Securities, generally U.S. government and federal agency securities, pledged as collateral under these financing arrangements can be repledged by the secured party. Additional collateral may be required based on the fair value of the underlying securities. Covered Assets, Loss Share Agreements, and Indemnification Asset On July 29, 2011, Old National acquired the banking operations of Integra in an FDIC assisted transaction. As part of the purchase and assumption agreement, Old National and the FDIC entered into loss sharing agreements (each, a “loss sharing agreement” and collectively, the “loss sharing agreements”), whereby the FDIC would cover a substantial portion of any future losses on loans (and related unfunded commitments), OREO and up to 90 days of certain accrued interest on loans. The acquired loans and OREO subject to the loss sharing agreements are referred to collectively as “covered assets.” Old National entered into an agreement with the FDIC on June 22, 2016 to terminate its loss share agreements. As a result of the termination of the loss share agreements, the remaining covered assets that were covered by the loss share arrangements were reclassified to noncovered assets effective June 22, 2016. Prior to the termination of the loss share agreements, the FDIC would have reimbursed us for 80% of expenses and valuation write-downs related to covered assets up to $275.0 million, an amount which we never reached. Loans were recorded at fair value in accordance with ASC Topic 805, Business Combinations. No allowance for loan losses related to the acquired loans was recorded on the acquisition date as the fair value of the loans acquired incorporated assumptions regarding credit risk. Loans acquired are recorded at fair value in accordance with the fair value methodology prescribed in ASC Topic 820, exclusive of the loss share agreements with the FDIC. These loans were aggregated into pools of loans based on common risk characteristics such as credit score, loan type, and date of origination. The fair value estimates associated with these pools of loans included estimates related to expected prepayments and the amount and timing of undiscounted expected principal, interest, and other cash flows. Because the FDIC would have reimbursed us for losses incurred on certain acquired loans, an indemnification asset (FDIC loss share receivable) was recorded at fair value at the acquisition date. The indemnification asset was recognized at the same time as the indemnified loans, and measured on the same basis, subject to collectibility or contractual limitations. The loss share agreements on the acquisition date reflected the reimbursements expected to be received from the FDIC, using an appropriate discount rate, which reflected counterparty credit risk and other uncertainties. Net Income per Share Basic net income per share is computed by dividing net income by the weighted-average number of common shares outstanding during each year. Diluted net income per share is computed as above and assumes the conversion of outstanding stock options and restricted stock. The following table reconciles basic and diluted net income per share for the years ended December 31. (dollars and shares in thousands, Years Ended December 31, except per share data) 2016 2015 2014 Basic Earnings Per Share Net income $ 134,264 $ 116,716 $ 103,667 Weighted average common shares outstanding 127,705 115,726 107,818 Basic Earnings Per Share $ 1.05 $ 1.01 $ 0.96 Diluted Earnings Per Share Net income $ 134,264 $ 116,716 $ 103,667 Weighted average common shares outstanding 127,705 115,726 107,818 Effect of dilutive securities: Restricted stock (1) 543 440 488 Stock options (2) 53 89 59 Weighted average shares outstanding 128,301 116,255 108,365 Diluted Earnings Per Share $ 1.05 $ 1.00 $ 0.95 (1) 3 thousand shares of restricted stock were not included in the computation of net income per diluted share at December 31, 2016 because the effect would be antidilutive. There were no shares excluded at December 31, 2015 or 2014 because the effect would be antidilutive. (2) Options to purchase 0.5 million shares, 0.7 million shares, and 1.0 million shares outstanding at December 31, 2016, 2015, and 2014, respectively, were not included in the computation of net income per diluted share because the exercise price of these options was greater than the average market price of the common shares and, therefore, the effect would be antidilutive. Stock-Based Compensation Compensation cost is recognized for stock options and restricted stock awards and units issued to employees based on the fair value of these awards at the date of grant. A Black-Scholes model is utilized to estimate the fair value of stock options, while the market price of our common stock at the date of grant is used for restricted stock awards. A third party provider is used to value certain restricted stock units where the performance measure is based on total shareholder return. Compensation expense is recognized over the requisite service period. Income Taxes Income tax expense is the total of the current year income tax due or refundable and the change in deferred tax assets and liabilities. Deferred tax assets and liabilities are the expected future tax amounts for the temporary differences between carrying amounts and tax bases of assets and liabilities, computed using enacted tax rates. A valuation allowance, if needed, reduces deferred tax assets to the amount expected to be realized. We recognize a tax position as a benefit only if it is “more likely than not” that the tax position would be sustained in a tax examination, with a tax examination being presumed to occur. The amount recognized is the largest amount of tax benefit that is greater than 50% likely of being realized on examination. For tax positions not meeting the “more likely than not” test, no tax benefit is recorded. We recognize interest and/or penalties related to income tax matters in income tax expense. Loss Contingencies Loss contingencies, including claims and legal actions arising in the normal course of business, are recorded as liabilities when the likelihood of loss is probable and an amount or range of loss can be reasonably estimated. See Note 23 to the consolidated financial statements for further disclosure. Statement of Cash Flows Data For the purpose of presentation in the accompanying consolidated statement of cash flows, cash and cash equivalents are defined as cash, due from banks, federal funds sold and resell agreements, and money market investments, which have maturities less than 90 days. The following table summarizes the supplemental cash flow information for the years ended December 31: Years Ended December 31, (dollars in thousands) 2016 2015 2014 Cash payments: Interest $ 43,698 $ 32,712 $ 21,005 Income taxes (net of refunds) 23,636 14,824 18,820 Noncash Investing and Financing Activities: Transfer of loans held for investment to loans held for sale — — 197,928 Transfer of premises and equipment to assets held for sale 4,620 9,070 3,042 The following table summarizes the common shares issued and resultant value of total shareholders’ equity associated with acquisitions for the years ended December 31: (dollars and shares in thousands) Shares of Common Stock Total 2016 Acquisition of Anchor BanCorp Wisconsin Inc. 20,415 $ 273,565 2015 Acquisition of Founders Financial Corporation 3,402 $ 50,626 2014 Acquisition of Tower Financial Corporation 5,626 $ 78,727 Acquisition of United Bancorp 9,117 123,806 Acquisition of LSB Financial Corp. 3,557 51,758 Impact of Accounting Changes FASB ASC 606 – No. 2014-09, In March 2016, the FASB issued ASU No. 2016-08, No. 2014-09 No. 2014-09. In April 2016, the FASB issued ASU No. 2016-10, No. 2014-09 No. 2014-09. In May 2016, the FASB issued ASU No. 2016-12, In December 2016, the FASB issued ASU No. 2016-20, No. 2014-09 No. 2014-09. No. 2014-09. FASB ASC 718 – No. 2014-12, In March 2016, the FASB issued ASU No. 2016-09, FASB ASC 350 – No. 2015-05, 350-40, In January 2017, the FASB issued ASU No. 2017-04, FASB ASC 944 – No. 2015-09, FASB ASC 805 No. 2015-16, In January 2017, the FASB issued ASU No. 2017-01, FASB ASC 825 No. 2016-01, 825-10): available-for-sale FASB ASC 842 – No. 2016-02, right-of-use FASB ASC 405 No. 2016-04, 405-20): FASB ASC 815 No. 2016-05, de-designation In March 2016, the FASB issued ASU No. 2016-06, FASB ASC 323 No. 2016-07, step-by-step available-for-sale FASB ASC 326 – No. 2016-13, available-for-sale one-time one-time FASB ASC 230 – No. 2016-15, No. 2016-18, FASB ASC 740 – No. 2016-16, FASB ASC 810 No. 2016-17,

Acquisition and Divestiture Act

Acquisition and Divestiture Activity	12 Months Ended
	Dec. 31, 2016
Business Combinations [Abstract]
Acquisition and Divestiture Activity	NOTE 2 – ACQUISITION AND DIVESTITURE ACTIVITY Acquisitions Tower Financial Corporation On September 10, 2013, Old National announced that it had entered into an agreement to acquire Tower Financial Corporation (“Tower”) through a stock and cash merger. The acquisition contemplated by this agreement was completed effective April 25, 2014 (the “Closing Date”). Tower was an Indiana bank holding company with Tower Bank & Trust Company as its wholly-owned subsidiary. Headquartered in Fort Wayne, Indiana, Tower operated seven banking centers and had approximately $556 million in trust assets under management on the Closing Date. The merger strengthened Old National’s position as one of the largest deposit holders in Indiana and Old National achieved cost savings by integrating the two companies and combining accounting, data processing, retail and lending support, and other administrative functions after the merger, which enabled Old National to achieve economies of scale in these areas. The total purchase price for Tower was $110.4 million, consisting of $31.7 million of cash and the issuance of 5.6 million shares of Old National Common Stock valued at $78.7 million. This acquisition was accounted for under the acquisition method of accounting. Accordingly, the Company recognized amounts for identifiable assets acquired and liabilities assumed at their estimated acquisition date fair values, while $5.6 million of transaction and integration costs associated with the acquisition were expensed as incurred. As of December 31, 2014, the Company finalized its valuation of all assets and liabilities acquired, resulting in no material change to purchase accounting adjustments. A summary of the final purchase price allocation is as follows (in thousands): Cash and cash equivalents $ 56,345 Investment securities 140,567 Federal Home Loan Bank stock 2,192 Loans held for sale 474 Loans 371,054 Premises and equipment 8,516 Accrued interest receivable 2,371 Other real estate owned 473 Company-owned life insurance 21,281 Other assets 15,200 Deposits (527,995 ) Securities sold under agreements to repurchase (18,898 ) Federal Home Loan Bank advances (5,500 ) Other borrowings (15,613 ) Accrued expenses and other liabilities (4,681 ) Net tangible assets acquired 45,786 Definite-lived intangible assets acquired 8,382 Goodwill 56,203 Purchase price $ 110,371 The portion of the purchase price allocated to goodwill will not be deductible for tax purposes. The components of the estimated fair value of the acquired identifiable intangible assets are in the table below. These intangible assets will be amortized on an accelerated basis over their estimated lives. Estimated Estimated Core deposit intangible $ 4.6 7 Trust customer relationship intangible $ 3.8 12 Acquired loan data for Tower can be found in the table below: (in thousands) Fair Value Gross Contractual Best Estimate at Acquired receivables subject to ASC 310-30 $ 12,855 $ 22,746 $ 5,826 Acquired receivables not subject to ASC 310-30 $ 358,199 $ 450,865 $ 42,302 United Bancorp, Inc. On January 8, 2014, Old National announced that it had entered into an agreement to acquire United Bancorp, Inc. (“United”) through a stock and cash merger. The acquisition contemplated by this agreement was completed effective July 31, 2014 (the “Closing Date”). United was a Michigan bank holding company with United Bank & Trust as its wholly-owned subsidiary. Headquartered in Ann Arbor, Michigan, United operated eighteen banking centers and had approximately $688 million in trust assets under management as of June 30, 2014. The merger doubled Old National’s presence in Michigan to 36 total branches and Old National achieved cost savings by integrating the two companies and combining accounting, data processing, retail and lending support, and other administrative functions after the merger, which enabled Old National to achieve economies of scale in these areas. The total purchase price for United was $157.8 million, consisting of $34.0 million of cash, the issuance of 9.1 million shares of Old National Common Stock valued at $122.0 million, and the assumption of United’s options and stock appreciation rights, valued at $1.8 million. This acquisition was accounted for under the acquisition method of accounting. Accordingly, the Company recognized amounts for identifiable assets acquired and liabilities assumed at their estimated acquisition date fair values, while $7.6 million of transaction and integration costs were expensed as incurred. As of July 31, 2015, the Company finalized its valuation of all assets and liabilities acquired, resulting in no material change to purchase accounting adjustments. A summary of the final purchase price allocation is as follows (in thousands): Cash and cash equivalents $ 16,447 Investment securities 154,885 Federal Home Loan Bank stock 2,880 Loans held for sale 1,073 Loans 632,016 Premises and equipment 7,741 Accrued interest receivable 2,614 Other real estate owned 1,676 Company-owned life insurance 14,857 Other assets 16,822 Deposits (763,681 ) Federal funds purchased (10,420 ) Federal Home Loan Bank advances (12,515 ) Accrued expenses and other liabilities (8,337 ) Net tangible assets acquired 56,058 Definite-lived intangible assets acquired 10,763 Loan servicing rights 8,983 Goodwill 81,952 Purchase price $ 157,756 The portion of the purchase price allocated to goodwill will not be deductible for tax purposes. The components of the estimated fair value of the acquired identifiable intangible assets are in the table below. These intangible assets will be amortized on an accelerated basis over their estimated lives. Estimated Estimated Core deposit intangible $ 5.9 7 Trust customer relationship intangible $ 4.9 12 Acquired loan data for United can be found in the table below: (in thousands) Fair Value Gross Contractual Best Estimate at Acquired receivables subject to ASC 310-30 $ 8,391 $ 15,483 $ 5,487 Acquired receivables not subject to ASC 310-30 $ 623,625 $ 798,967 $ 89,430 LSB Financial Corp. On June 3, 2014, Old National announced that it had entered into an agreement to acquire LSB Financial Corp. (“LSB”) through a stock and cash merger. The acquisition was completed effective November 1, 2014 (the “Closing Date”). LSB was a savings and loan holding company with Lafayette Savings Bank as its wholly-owned subsidiary. LSB was the largest bank headquartered in Lafayette, Indiana and operated five full-service banking centers. The merger strengthened Old National’s position as one of the largest deposit holders in Indiana and Old National achieved cost savings by integrating the two companies and combining accounting, data processing, retail and lending support, and other administrative functions after the merger, which enabled Old National to achieve economies of scale in these areas. The total purchase price for LSB was $69.6 million, consisting of $17.8 million of cash and the issuance of 3.6 million shares of Old National Common Stock valued at $51.8 million. This acquisition was accounted for under the acquisition method of accounting. Accordingly, the Company recognized amounts for identifiable assets acquired and liabilities assumed at their estimated acquisition date fair values, while $3.2 million of transaction and integration costs associated with the acquisition were expensed as incurred. As of September 30, 2015, the Company finalized its valuation of all assets and liabilities acquired, resulting in no material change to purchase accounting adjustments. A summary of the final purchase price allocation is as follows (in thousands): Cash and cash equivalents $ 7,589 Investment securities 63,684 Federal Home Loan Bank stock 3,185 Loans held for sale 1,035 Loans 235,377 Premises and equipment 6,492 Accrued interest receivable 1,044 Other real estate owned 30 Company-owned life insurance 7,438 Other assets 11,490 Deposits (292,068 ) Federal Home Loan Bank advances (15,203 ) Accrued expenses and other liabilities (4,582 ) Net tangible assets acquired 25,511 Definite-lived intangible assets acquired 2,618 Loan servicing rights 990 Goodwill 40,476 Purchase price $ 69,595 The portion of the purchase price allocated to goodwill will not be deductible for tax purposes. The estimated fair value of the core deposit intangible is $2.6 million and will be amortized over an estimated useful life of 7 years. Acquired loan data for LSB can be found in the table below: (in thousands) Fair Value of Acquired Loans Gross Contractual Best Estimate at Acquisition Date of Acquired receivables subject to ASC 310-30 $ 11,986 $ 24,493 $ 9,903 Acquired receivables not subject to ASC 310-30 $ 223,391 $ 340,832 $ 57,884 Founders Financial Corporation On July 28, 2014, Old National announced that it had entered into an agreement to acquire Grand Rapids, Michigan-based Founders Financial Corporation (“Founders”) through a stock and cash merger. The acquisition was completed effective January 1, 2015 (the “Closing Date”). Founders was a bank holding company with Founders Bank & Trust as its wholly-owned subsidiary and operated four full-service banking centers in Kent County. Old National achieved cost savings by integrating the two companies and combining accounting, data processing, retail and lending support, and other administrative functions after the merger, which enabled Old National to achieve economies of scale in these areas. The total purchase price for Founders was $91.7 million, consisting of $41.0 million of cash and the issuance of 3.4 million shares of Old National Common Stock valued at $50.6 million. This acquisition was accounted for under the acquisition method of accounting. Accordingly, the Company recognized amounts for identifiable assets acquired and liabilities assumed at their estimated acquisition date fair values. Through December 31, 2015, transaction and integration costs of $4.9 million associated with the acquisition had been expensed. As of December 31, 2015, the Company finalized its valuation of all assets and liabilities acquired, resulting in no material change to purchase accounting adjustments. A summary of the final purchase price allocation is as follows (in thousands): Cash and cash equivalents $ 3,978 Investment securities 75,383 Federal Home Loan Bank stock 1,810 Loans held for sale 3,473 Loans 339,569 Premises and equipment 3,604 Accrued interest receivable 1,260 Other real estate owned 674 Company-owned life insurance 8,297 Other assets 8,804 Deposits (376,656 ) Securities sold under agreements to repurchase (12,492 ) Federal Home Loan Bank advances (26,888 ) Accrued expenses and other liabilities (1,307 ) Net tangible assets acquired 29,509 Definite-lived intangible assets acquired 5,515 Loan servicing rights 664 Goodwill 56,014 Purchase price $ 91,702 The portion of the purchase price allocated to goodwill will not be deductible for tax purposes. The components of the estimated fair value of the acquired identifiable intangible assets are in the table below. These intangible assets will be amortized on an accelerated basis over their estimated lives. Estimated Estimated Core deposit intangible $ 2.9 7 Trust customer relationship intangible $ 2.6 12 Acquired loan data for Founders can be found in the table below: (in thousands) Fair Value Gross Contractual Best Estimate at Flows Not Expected Acquired receivables subject to ASC 310-30 $ 6,607 $ 11,103 $ 2,684 Acquired receivables not subject to ASC 310-30 $ 332,962 $ 439,031 $ 61,113 Anchor BanCorp Wisconsin Inc. On January 12, 2016, Old National announced that it had entered into an agreement to acquire Madison, Wisconsin-based Anchor BanCorp Wisconsin Inc. (“Anchor”) through a stock and cash merger. The acquisition was completed effective May 1, 2016 (the “Closing Date”). Anchor was a savings and loan holding company with AnchorBank, fsb (“AnchorBank”) as its wholly-owned subsidiary. AnchorBank operated 46 banking centers, including 32 banking centers in the Madison, Milwaukee and Fox Valley triangle. Old National believes that it will be able to achieve cost savings by integrating the two companies and combining accounting, data processing, retail and lending support, and other administrative functions after the merger, which will enable Old National to achieve economies of scale in these areas. Pursuant to the merger agreement, shareholders of Anchor could elect to receive either 3.5505 shares of Old National common stock or $48.50 in cash for each share of Anchor they held, subject to a maximum of 40% of the purchase price in cash. The total purchase price for Anchor was $459.8 million, consisting of $186.2 million of cash and the issuance of 20.4 million shares of Old National Common Stock valued at $273.6 million. This acquisition was accounted for under the acquisition method of accounting. Accordingly, the Company recognized amounts for identifiable assets acquired and liabilities assumed at their estimated acquisition date fair values. Through December 31, 2016, transaction and integration costs of $15.9 million associated with the acquisition have been expensed and remaining integration costs will be expensed in future periods as incurred. Under the acquisition method of accounting, the total estimated purchase price is allocated to net tangible and intangible assets based on their current estimated fair values on the date of acquisition. Based on management’s preliminary valuation of the fair value of tangible and intangible assets acquired and liabilities assumed, which are based on assumptions that are subject to change, the purchase price for the Anchor acquisition is allocated as follows (in thousands): Cash and cash equivalents $ 123,657 Investment securities 235,240 Federal Home Loan Bank stock 4,596 Loans held for sale 9,334 Loans 1,637,806 Premises and equipment 35,721 Accrued interest receivable 7,308 Other real estate owned 17,349 Company-owned life insurance 7,278 Other assets 126,210 Deposits (1,852,713 ) Securities sold under agreements to repurchase (3,132 ) Other borrowings (123 ) Accrued expenses and other liabilities (36,957 ) Net tangible assets acquired 311,574 Definite-lived intangible assets acquired 21,559 Loan servicing rights 15,274 Goodwill 111,347 Purchase price $ 459,754 Prior to the end of the one year measurement period for finalizing the purchase price allocation, if information becomes available which would indicate adjustments are required to the purchase price allocation, such adjustments will be included in the purchase price allocation in the reporting period in which the adjustment amounts are determined. The portion of the purchase price allocated to goodwill will not be deductible for tax purposes. The estimated fair value of the core deposit intangible is $21.6 million and will be amortized over an estimated useful life of 7 years. Acquired loan data for Anchor can be found in the table below: (in thousands) Fair Value of Acquired Loans at Acquisition Date Gross Contractual Best Estimate at Acquired receivables subject to ASC 310-30 $ 20,174 $ 29,544 $ 6,153 Acquired receivables not subject to ASC 310-30 $ 1,617,632 $ 2,143,532 $ 274,155 Summary of Unaudited Pro-Forma The unaudited pro-forma pro-forma (dollars in thousands) 2016 2015 Revenue (1) $ 701,303 $ 700,500 Income before income taxes $ 241,068 $ 195,347 (1) Net interest income plus noninterest income. Supplemental pro-forma pro-forma Insurance Acquisitions Effective February 1, 2015, Old National acquired certain assets from Mutual Underwriters Insurance (“Mutual Underwriters”). The total purchase price of the assets was $3.7 million, consisting of $2.6 million of customer business relationship intangibles and $1.1 million of goodwill. The customer business relationship intangibles were originally scheduled to be amortized using an accelerated method over an estimated useful life of 10 years. On May 8, 2015, the Company issued cash consideration of $0.1 million to purchase a book of business. The acquisition terms called for further cash consideration of approximately $0.1 million if certain operating targets were met. The fair value of these payments was booked at acquisition and added $0.2 million of customer business relationships intangibles. The customer business relationship intangibles were originally scheduled to be amortized using an accelerated method over an estimated useful life of 10 years. Divestitures On August 14, 2015, the Company divested its southern Illinois region (twelve branches) along with four branches in eastern Indiana and one in Ohio. At closing, the purchasers assumed loans of $193.6 million and deposits of $555.8 million. The Company recorded a net pre-tax In addition, the Company consolidated 23 branches throughout the Old National franchise during 2015 based on an ongoing assessment of our service and delivery network and on our goal to continue to move our franchise into stronger growth markets. On May 31, 2016 the Company sold its insurance operations, ONB Insurance Group, Inc. (“ONI”). The Company received approximately $91.8 million in cash resulting in a pre-tax after-tax 2014-08 “Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity”. Based on an ongoing assessment of our service and delivery network, the Company consolidated five branches during 2016 and an additional fifteen in January 2017.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	12 Months Ended
	Dec. 31, 2016
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	NOTE 3 – ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) The following table summarizes the changes within each classification of accumulated other comprehensive income (loss) (“AOCI”) net of tax for the years ended December 31, 2016, 2015, and 2014: (dollars in thousands) Unrealized Gains Available-for-Sale Unrealized Gains Held-to-Maturity Gains and Defined Total 2016 Balance at January 1, 2016 $ (3,806 ) $ (14,480 ) $ (9,276 ) $ (7,235 ) $ (34,797 ) Other comprehensive income (loss) before reclassifications (31,513 ) — (1,440 ) — (32,953 ) Amounts reclassified from accumulated other comprehensive income (loss) (a) (3,693 ) 1,170 4,001 6,900 8,378 Net other comprehensive income (loss) (35,206 ) 1,170 2,561 6,900 (24,575 ) Balance at December 31, 2016 $ (39,012 ) $ (13,310 ) $ (6,715 ) $ (335 ) $ (59,372 ) 2015 Balance at January 1, 2015 $ (748 ) $ (15,776 ) $ (5,935 ) $ (9,096 ) $ (31,555 ) Other comprehensive income (loss) before reclassifications 554 — (5,027 ) — (4,473 ) Amounts reclassified from accumulated other comprehensive income (loss) (a) (3,612 ) 1,296 1,686 1,861 1,231 Net other comprehensive income (loss) (3,058 ) 1,296 (3,341 ) 1,861 (3,242 ) Balance at December 31, 2015 $ (3,806 ) $ (14,480 ) $ (9,276 ) $ (7,235 ) $ (34,797 ) 2014 Balance at January 1, 2014 $ (21,108 ) $ (16,767 ) $ (190 ) $ (6,401 ) $ (44,466 ) Other comprehensive income (loss) before reclassifications 26,391 — (5,899 ) — 20,492 Amounts reclassified from accumulated other comprehensive income (loss) (a) (6,031 ) 991 154 (2,695 ) (7,581 ) Net other comprehensive income (loss) 20,360 991 (5,745 ) (2,695 ) 12,911 Balance at December 31, 2014 $ (748 ) $ (15,776 ) $ (5,935 ) $ (9,096 ) $ (31,555 ) (a) See table below for details about reclassifications. The following tables summarize the significant amounts reclassified out of each component of AOCI for the years ended December 31, 2016, 2015, and 2014: Details about AOCI Components Amount Reclassified from AOCI Affected Line Item in the Statement of Income Years Ended December 31, (dollars in thousands) 2016 2015 2014 Unrealized gains and losses on available-for-sale $ 5,848 $ 5,718 $ 9,830 Net securities gains — — (100 ) Impairment losses 5,848 5,718 9,730 Income before income taxes (2,155 ) (2,106 ) (3,699 ) Income tax (expense) benefit $ 3,693 $ 3,612 $ 6,031 Net income Unrealized gains and losses on held-to-maturity $ (1,776 ) $ (1,692 ) $ (1,437 ) Interest income/(expense) 606 396 446 Income tax (expense) benefit $ (1,170 ) $ (1,296 ) $ (991 ) Net income Gains and losses on cash flow hedges Interest rate contracts $ (6,453 ) $ (2,719 ) $ (248 ) Interest income/(expense) 2,452 1,033 94 Income tax (expense) benefit $ (4,001 ) $ (1,686 ) $ (154 ) Net income Amortization of defined benefit pension items Actuarial gains/(losses) and settlement cost $ (11,203 ) $ (3,002 ) $ 4,333 Salaries and employee benefits 4,303 1,141 (1,638 ) Income tax (expense) benefit $ (6,900 ) $ (1,861 ) $ 2,695 Net income Total reclassifications for the period $ (8,378 ) $ (1,231 ) $ 7,581 Net income

Investment Securities

Investment Securities	12 Months Ended
	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Investment Securities	NOTE 4 - INVESTMENT SECURITIES The following table summarizes the amortized cost and fair value of the available-for-sale held-to-maturity (dollars in thousands) Amortized Unrealized Unrealized Fair Value 2016 Available-for-Sale U.S. Treasury $ 6,963 $ 140 $ — $ 7,103 U.S. government-sponsored entities and agencies 506,234 113 (12,391 ) 493,956 Mortgage-backed securities - Agency 1,551,465 6,923 (33,369 ) 1,525,019 States and political subdivisions 446,003 4,183 (13,502 ) 436,684 Pooled trust preferred securities 17,011 — (8,892 ) 8,119 Other securities 331,001 1,074 (5,782 ) 326,293 Total available-for-sale $ 2,858,677 $ 12,433 $ (73,936 ) $ 2,797,174 Held-to-Maturity U.S. government-sponsored entities and agencies $ 40,131 $ 427 $ — $ 40,558 Mortgage-backed securities - Agency 10,640 300 — 10,940 States and political subdivisions 694,319 38,915 (560 ) 732,674 Total held-to-maturity $ 745,090 $ 39,642 $ (560 ) $ 784,172 2015 Available-for-Sale U.S. Treasury $ 11,968 $ 190 $ (8 ) $ 12,150 U.S. government-sponsored entities and agencies 615,578 1,495 (3,523 ) 613,550 Mortgage-backed securities - Agency 1,065,936 10,970 (10,545 ) 1,066,361 States and political subdivisions 375,671 11,960 (335 ) 387,296 Pooled trust preferred securities 17,320 — (9,420 ) 7,900 Other securities 337,590 1,151 (7,777 ) 330,964 Total available-for-sale $ 2,424,063 $ 25,766 $ (31,608 ) $ 2,418,221 Held-to-Maturity U.S. government-sponsored entities and agencies $ 142,864 $ 2,899 $ — $ 145,763 Mortgage-backed securities - Agency 16,042 562 — 16,604 States and political subdivisions 713,205 53,848 (3 ) 767,050 Total held-to-maturity $ 872,111 $ 57,309 $ (3 ) $ 929,417 Proceeds from sales or calls of available-for-sale (dollars in thousands) 2016 2015 2014 Proceeds from sales of available-for-sale $ 243,312 $ 343,486 $ 214,912 Proceeds from calls of available-for-sale 635,624 404,277 123,141 Total $ 878,936 $ 747,763 $ 338,053 Realized gains on sales of available-for-sale $ 5,423 $ 5,640 $ 9,938 Realized gains on calls of available-for-sale 922 605 154 Realized losses on sales of available-for-sale (450 ) (518 ) (128 ) Realized losses on calls of available-for-sale (147 ) (15 ) (471 ) Other securities gains (1) 100 6 337 Net securities gains $ 5,848 $ 5,718 $ 9,830 (1) Other securities gains includes net realized gains or losses associated with trading securities and mutual funds. During 2015, the Company sold a municipal bond that was classified as held-to-maturity Investment securities with a carrying value of $1.4 billion were pledged to secure public and other funds at December 31, 2016 and December 31, 2015. Trading securities, which consist of mutual funds held in trusts associated with deferred compensation plans for former directors and executives, are recorded at fair value and totaled $5.0 million at December 31, 2016 and $3.9 million at December 31, 2015. At December 31, 2016, Old National had a concentration of investment securities issued by certain states and their political subdivisions with the following aggregate market values: $369.4 million by Indiana, which represented 20.4% of shareholders’ equity, and $198.2 million by Texas, which represented 10.9% of shareholders’ equity. Of the Indiana municipal bonds, 97% are rated “A” or better, and the remaining 3% generally represent non-rated All of the mortgage-backed securities in the investment portfolio are residential mortgage-backed securities. The amortized cost and fair value of the investment securities portfolio are shown by expected maturity. Expected maturities may differ from contractual maturities if borrowers have the right to call or prepay obligations with or without call or prepayment penalties. Weighted average yield is based on amortized cost. At December 31, 2016 (dollars in thousands) Maturity Amortized Fair Value Weighted Available-for-Sale Within one year $ 37,370 $ 37,431 1.72 % One to five years 320,815 318,852 2.18 Five to ten years 329,607 329,892 2.85 Beyond ten years 2,170,885 2,110,999 2.43 Total $ 2,858,677 $ 2,797,174 2.44 % Held-to-Maturity Within one year $ 10,796 $ 10,906 4.02 % One to five years 74,451 77,228 4.71 Five to ten years 129,452 135,004 4.86 Beyond ten years 530,391 561,034 5.58 Total $ 745,090 $ 784,172 5.35 % The following table summarizes the investment securities with unrealized losses at December 31 by aggregated major security type and length of time in a continuous unrealized loss position: Less than 12 months 12 months or longer Total (dollars in thousands) Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized 2016 Available-for-Sale U.S. Treasury $ — $ — $ — $ — $ — $ — U.S. government-sponsored entities and agencies 432,192 (12,391 ) — — 432,192 (12,391 ) Mortgage-backed securities - Agency 1,177,093 (30,295 ) 57,636 (3,074 ) 1,234,729 (33,369 ) States and political subdivisions 286,351 (13,247 ) 4,919 (255 ) 291,270 (13,502 ) Pooled trust preferred securities — — 8,119 (8,892 ) 8,119 (8,892 ) Other securities 121,498 (2,734 ) 126,539 (3,048 ) 248,037 (5,782 ) Total available-for-sale $ 2,017,134 $ (58,667 ) $ 197,213 $ (15,269 ) $ 2,214,347 $ (73,936 ) Held-to-Maturity States and political subdivisions $ 59,481 $ (560 ) $ — $ — $ 59,481 $ (560 ) Total held-to-maturity $ 59,481 $ (560 ) $ — $ — $ 59,481 $ (560 ) 2015 Available-for-Sale U.S. Treasury $ 6,505 $ (8 ) $ — $ — $ 6,505 $ (8 ) U.S. government-sponsored entities and agencies 160,751 (1,492 ) 122,581 (2,031 ) 283,332 (3,523 ) Mortgage-backed securities - Agency 256,359 (3,444 ) 239,047 (7,101 ) 495,406 (10,545 ) States and political subdivisions 38,373 (161 ) 5,137 (174 ) 43,510 (335 ) Pooled trust preferred securities — — 7,900 (9,420 ) 7,900 (9,420 ) Other securities 156,604 (2,717 ) 126,661 (5,060 ) 283,265 (7,777 ) Total available-for-sale $ 618,592 $ (7,822 ) $ 501,326 $ (23,786 ) $ 1,119,918 $ (31,608 ) Held-to-Maturity States and political subdivisions $ 2,026 $ (3 ) $ — $ — $ 2,026 $ (3 ) Total held-to-maturity $ 2,026 $ (3 ) $ — $ — $ 2,026 $ (3 ) Management evaluates securities for other-than-temporary impairment (“OTTI”) at least on a quarterly basis, and more frequently when economic or market conditions warrant such an evaluation. The investment securities portfolio is evaluated for OTTI by segregating the portfolio into two general segments and applying the appropriate OTTI model. Investment securities classified as available-for-sale held-to-maturity Accounting for Certain Investments in Debt and Equity Securities non-agency 325-10 No. 99-20, Recognition of Interest Income and Impairment on Purchased Beneficial Interests and Beneficial Interests that Continue to be Held by a Transfer in Securitized Financial Assets . In determining OTTI under the FASB ASC 320 (SFAS No. 115) model, management considers many factors, including: (1) the length of time and the extent to which the fair value has been less than cost, (2) the financial condition and near-term prospects of the issuer, (3) whether the market decline was affected by macroeconomic conditions, and (4) whether the entity has the intent to sell the debt security or more likely than not will be required to sell the debt security before its anticipated recovery. The assessment of whether an other-than-temporary decline exists involves a high degree of subjectivity and judgment and is based on the information available to management at a point in time. The second segment of the portfolio uses the OTTI guidance provided by FASB ASC 325-10 99-20) 325-10 When other-than-temporary impairment occurs under either model, the amount of the other-than-temporary impairment recognized in earnings depends on whether an entity intends to sell the security or more likely than not will be required to sell the security before recovery of its amortized cost basis less any current-period credit loss. If an entity intends to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis less any current-period credit loss, the other-than-temporary impairment shall be recognized in earnings equal to the entire difference between the investment’s amortized cost basis and its fair value at the balance sheet date. Otherwise, the other-than-temporary impairment shall be separated into the amount representing the credit loss and the amount related to all other factors. The amount of the total other-than-temporary impairment related to the credit loss is determined based on the present value of cash flows expected to be collected and is recognized in earnings. The amount of the total other-than-temporary impairment related to other factors shall be recognized in other comprehensive income, net of applicable taxes. The previous amortized cost basis less the other-than-temporary impairment recognized in earnings shall become the new amortized cost basis of the investment. We did not record other-than-temporary impairments in 2016 or 2015. Other-than-temporary impairments totaled $100 thousand in 2014. As of December 31, 2016, Old National’s securities portfolio consisted of 1,715 securities, 507 of which were in an unrealized loss position. The unrealized losses attributable to our U.S. government-sponsored entities and agencies, agency mortgage-backed securities, states and political subdivisions, and other securities are the result of fluctuations in interest rates. Our pooled trust preferred securities are discussed below. Pooled Trust Preferred Securities At December 31, 2016, our securities portfolio contained three pooled trust preferred securities with a fair value of $8.1 million and unrealized losses of $8.9 million. One of the pooled trust preferred securities in our portfolio falls within the scope of FASB ASC 325-10 99-20) Two of our pooled trust preferred securities with a fair value of $7.8 million and unrealized losses of $6.0 million at December 31, 2016 are not subject to FASB ASC 325-10. The table below summarizes the relevant characteristics of our pooled trust preferred securities as well as our single issuer trust preferred securities that are included in the “other securities” category in this footnote. Each of the pooled trust preferred securities support a more senior tranche of security holders. All three pooled trust preferred securities have experienced credit defaults. However, two of these securities have excess subordination and are not other-than-temporarily impaired as a result of their class hierarchy, which provides more loss protection. Trust preferred securities December 31, 2016 (dollars in thousands) Class Lowest Amortized Fair Unrealized Realized # of Issuers Actual Expected Excess Pooled trust preferred securities: Reg Div Funding 2004 B-2 D $ 3,111 $ 251 $ (2,860 ) $ — 21/38 34.7 % 8.4 % 0.0 % Pretsl XXVII LTD B B 4,422 2,333 (2,089 ) — 35/44 16.7 % 12.2 % 32.3 % Trapeza Ser 13A A2A BBB 9,478 5,535 (3,943 ) — 50/55 4.5 % 8.3 % 49.7 % 17,011 8,119 (8,892 ) — Single Issuer trust preferred securities: Fleet Cap Tr V (BOA) BB+ 3,397 3,045 (352 ) — JP Morgan Chase Cap XIII BBB- 4,767 4,369 (398 ) — NB-Global BB+ 786 905 119 — Chase Cap II BBB- 822 891 69 — 9,772 9,210 (562 ) — Total $ 26,783 $ 17,329 $ (9,454 ) $ — (1) Lowest rating for the security provided by any nationally recognized credit rating agency.

Loans Held for Sale

Loans Held for Sale	12 Months Ended
	Dec. 31, 2016
Debt Disclosure [Abstract]
Loans Held for Sale	NOTE 5 – LOANS HELD FOR SALE Mortgage loans held for immediate sale in the secondary market were $90.7 million at December 31, 2016, compared to $13.8 million at December 31, 2015. Residential loans that Old National has originated with the intent to sell are recorded at fair value in accordance with FASB ASC 825-10 The Fair Value Option for Financial Assets and Financial Liabilities in-house During the fourth quarter of 2014, $197.9 million of loans were reclassified to loans held for sale at the lower of cost or fair value. When the branch divestitures closed during the third quarter of 2015, these loans were valued at $193.6 million, resulting in a gain of $0.1 million. At December 31, 2016, there were no loans held for sale under this arrangement.

Finance Receivables and Allowan

Finance Receivables and Allowance for Credit Losses	12 Months Ended
	Dec. 31, 2016
Text Block [Abstract]
Finance Receivables and Allowance for Credit Losses	NOTE 6 – FINANCE RECEIVABLES AND ALLOWANCE FOR CREDIT LOSSES Old National’s finance receivables consist primarily of loans made to consumers and commercial clients in various industries including manufacturing, agribusiness, transportation, mining, wholesaling, and retailing. Most of Old National’s lending activity occurs within our principal geographic markets of Indiana, Kentucky, Michigan, and Wisconsin. Old National has no concentration of commercial or commercial real estate loans in any single industry exceeding 10% of its portfolio. The composition of loans at December 31 by lending classification was as follows: (dollars in thousands) 2016 2015 Commercial (1) $ 1,917,099 $ 1,804,615 Commercial real estate: Construction 199,509 185,449 Other 2,931,344 1,662,372 Residential real estate 2,087,530 1,644,614 Consumer credit: Home equity 476,439 359,954 Auto 1,167,737 1,050,336 Other 230,854 133,478 Covered loans — 107,587 Total loans 9,010,512 6,948,405 Allowance for loan losses (49,808 ) (51,296 ) Allowance for loan losses - covered loans — (937 ) Net loans $ 8,960,704 $ 6,896,172 (1) Includes direct finance leases of $10.8 million at December 31, 2016 and $14.4 million at December 31, 2015. The risk characteristics of each loan portfolio segment are as follows: Commercial Commercial loans are primarily based on the identified cash flows of the borrower and secondarily on the underlying collateral provided by the borrower. The cash flows of borrowers, however, may not be as expected and the collateral securing these loans may fluctuate in value. Most commercial loans are secured by the assets being financed or other business assets such as accounts receivable or inventory and may incorporate a personal guarantee; however, some short-term loans may be made on an unsecured basis. In the case of loans secured by accounts receivable, the availability of funds for the repayment of these loans may be substantially dependent on the ability of the borrower to collect amounts due from its customers. Commercial Real Estate These loans are viewed primarily as cash flow loans and secondarily as loans secured by real estate. Commercial real estate lending typically involves higher loan principal amounts, and the repayment of these loans is generally dependent on the successful operation of the property securing the loan or the business conducted on the property securing the loan. Commercial real estate loans may be adversely affected by conditions in the real estate markets or in the general economy. The properties securing Old National’s commercial real estate portfolio are diverse in terms of type and geographic location. Management monitors and evaluates commercial real estate loans based on collateral, geography and risk grade criteria. In addition, management tracks the level of owner-occupied commercial real estate loans versus non-owner Included with commercial real estate are construction loans, which are underwritten utilizing independent appraisal reviews, sensitivity analysis of absorption and lease rates, financial analysis of the developers and property owners, and feasibility studies, if available. Construction loans are generally based on estimates of costs and value associated with the complete project. These estimates may be inaccurate. Construction loans often involve the disbursement of substantial funds with repayment substantially dependent on the success of the ultimate project. Sources of repayment for these types of loans may be pre-committed on-site The acquisition of Anchor on May 1, 2016 added $926.2 million of commercial real estate loans to our portfolio. At 189%, Old National Bank’s commercial real estate loans as a percentage of its risk-based capital remained well below the regulatory guideline limit of 300% at December 31, 2016. Residential With respect to residential loans that are secured by 1-4 loan-to-value Consumer Home equity loans are typically secured by a subordinate interest in 1-4 Covered loans Old National entered into an agreement with the FDIC on June 22, 2016 to terminate its loss share agreements. As a result of the termination of the loss share agreements, the remaining loans that were covered by the loss share arrangements were reclassified to noncovered loans effective June 22, 2016. All future gains and losses associated with covered loans will be recognized entirely by Old National. Prior to the termination of the loss share agreements, certain loans acquired from the FDIC were classified as covered loans. Covered loans were subject to loss share agreements whereby Old National was indemnified against 80% of losses up to $275.0 million, an amount which we never reached. See Notes 1 and 7 to the consolidated financial statements for further details on our covered loans. Related Party Loans In the ordinary course of business, Old National grants loans to certain executive officers, directors, and significant subsidiaries (collectively referred to as “related parties”). Activity in related party loans during 2016 is presented in the following table: (dollars in thousands) 2016 Balance at January 1, $ 8,145 New loans 5,813 Repayments (5,464 ) Balance at December 31, $ 8,494 Allowance for Loan Losses The allowance for loan losses is maintained at a level believed adequate by management to absorb probable losses incurred in the consolidated loan portfolio. Management’s evaluation of the adequacy of the allowance is an estimate based on reviews of individual loans, pools of homogeneous loans, assessments of the impact of current and anticipated economic conditions on the portfolio, and historical loss experience. The allowance is increased through a provision charged to operating expense. Loans deemed to be uncollectible are charged to the allowance. Recoveries of loans previously charged-off We utilize a probability of default (“PD”) and loss given default (“LGD”) model as a tool to determine the adequacy of the allowance for loan losses for performing commercial and commercial real estate loans. The PD is forecast using a transition matrix to determine the likelihood of a customer’s asset quality rating (“AQR”) migrating from its current AQR to any other status within the time horizon. Transition rates are measured using Old National’s own historical experience. The model assumes that recent historical transition rates will continue into the future. The LGD is defined as credit loss incurred when an obligor of the bank defaults. The sum of all net charge-offs for a particular portfolio segment are divided by all loans that have defaulted over a given period of time. The expected loss derived from the model considers the PD, LGD, and exposure at default. Additionally, qualitative factors, such as changes in lending policies or procedures, and economic business conditions are also considered. We use historic loss ratios adjusted for economic conditions to determine the appropriate level of allowance for residential real estate and consumer loans. No allowance was brought forward on any of the acquired loans as any credit deterioration evident in the loans was included in the determination of the fair value of the loans at the acquisition date. An allowance for loan losses will be established for any subsequent credit deterioration or adverse changes in expected cash flows. Old National’s activity in the allowance for loan losses for the years ended December 31, 2016, 2015, and 2014 was as follows: (dollars in thousands) Commercial Commercial Residential Consumer Unallocated Total 2016 Allowance for loan losses: Beginning balance $ 26,347 $ 15,993 $ 2,051 $ 7,842 $ — $ 52,233 Charge-offs (5,047 ) (2,632 ) (800 ) (6,131 ) — (14,610 ) Recoveries 3,102 4,763 174 3,186 — 11,225 Provision (2,921 ) 49 218 3,614 — 960 Ending balance $ 21,481 $ 18,173 $ 1,643 $ 8,511 $ — $ 49,808 2015 Allowance for loan losses: Beginning balance $ 20,670 $ 17,348 $ 2,962 $ 6,869 $ — $ 47,849 Charge-offs (3,513 ) (1,921 ) (1,039 ) (6,404 ) — (12,877 ) Recoveries 5,218 4,685 354 4,081 — 14,338 Provision 3,972 (4,119 ) (226 ) 3,296 — 2,923 Ending balance $ 26,347 $ 15,993 $ 2,051 $ 7,842 $ — $ 52,233 2014 Allowance for loan losses: Beginning balance $ 16,565 $ 22,401 $ 3,239 $ 4,940 $ — $ 47,145 Charge-offs (3,535 ) (3,647 ) (793 ) (4,675 ) — (12,650 ) Recoveries 3,125 3,871 205 3,056 — 10,257 Provision 4,515 (5,277 ) 311 3,548 — 3,097 Ending balance $ 20,670 $ 17,348 $ 2,962 $ 6,869 $ — $ 47,849 The following table provides Old National’s recorded investment in financing receivables by portfolio segment at December 31, 2016 and 2015 and other information regarding the allowance: (dollars in thousands) Commercial Commercial Residential Consumer Unallocated Total December 31, 2016 Allowance for loan losses: Individually evaluated for impairment $ 4,561 $ 3,437 $ — $ — $ — $ 7,998 Collectively evaluated for impairment 16,838 14,717 1,643 8,334 — 41,532 Loans acquired with deteriorated credit quality 82 19 — 177 — 278 Total allowance for loan losses $ 21,481 $ 18,173 $ 1,643 $ 8,511 $ — $ 49,808 Loans and leases outstanding: Individually evaluated for impairment $ 45,960 $ 57,230 $ — $ — $ — $ 103,190 Collectively evaluated for impairment 1,870,289 3,040,849 2,073,950 1,866,815 — 8,851,903 Loans acquired with deteriorated credit quality 850 32,774 13,580 8,215 — 55,419 Total loans and leases outstanding $ 1,917,099 $ 3,130,853 $ 2,087,530 $ 1,875,030 $ — $ 9,010,512 December 31, 2015 Allowance for loan losses: Individually evaluated for impairment $ 7,467 $ 4,021 $ — $ — $ — $ 11,488 Collectively evaluated for impairment 18,295 11,439 2,038 7,614 — 39,386 Loans acquired with deteriorated credit quality 247 533 13 70 — 863 Covered loans acquired with deteriorated credit quality 338 — — 158 — 496 Total allowance for loan losses $ 26,347 $ 15,993 $ 2,051 $ 7,842 $ — $ 52,233 Loans and leases outstanding: Individually evaluated for impairment $ 60,959 $ 41,987 $ — $ — $ — $ 102,946 Collectively evaluated for impairment 1,750,397 1,779,062 1,644,631 1,590,288 — 6,764,378 Loans acquired with deteriorated credit quality 691 28,499 127 3,925 — 33,242 Covered loans acquired with deteriorated credit quality 2,893 19,424 16,577 8,945 — 47,839 Total loans and leases outstanding $ 1,814,940 $ 1,868,972 $ 1,661,335 $ 1,603,158 $ — $ 6,948,405 Credit Quality Old National’s management monitors the credit quality of its financing receivables in an on-going non-homogeneous Criticized Classified – Substandard Classified – Nonaccrual Classified – Doubtful Pass rated loans are those loans that are other than criticized, classified – substandard, classified – nonaccrual, or classified – doubtful. As of December 31, 2016 and 2015, the risk category of commercial and commercial real estate loans by class of loans was as follows: (dollars in thousands) Corporate Credit Exposure Credit Risk Profile by Internally Assigned Grade Commercial Commercial Real Estate - Commercial Real Estate - Other 2016 2015 (1) 2016 2015 (1) 2016 2015 (1) Grade: Pass $ 1,750,923 $ 1,672,672 $ 194,875 $ 182,701 $ 2,822,340 $ 1,508,309 Criticized 45,614 55,570 229 3,300 49,619 75,477 Classified - substandard 63,978 24,723 1,636 1,857 18,128 49,091 Classified - nonaccrual 53,062 58,469 2,769 830 32,234 39,521 Classified - doubtful 3,522 3,506 — — 9,023 7,886 Total $ 1,917,099 $ 1,814,940 $ 199,509 $ 188,688 $ 2,931,344 $ 1,680,284 (1) Includes loans previously covered by loss share agreements with the FDIC. Commercial loans as of December 31, 2016 in the table above include loans attributable to the acquisition of Anchor totaling $0.3 million in the criticized category and $0.7 million in the classified – nonaccrual category. There were no construction commercial real estate loans in the criticized or classified categories attributable to the acquisition of Anchor as of December 31, 2016. Other commercial real estate as of December 31, 2016 in the table above includes loans attributable to the acquisition of Anchor totaling $8.0 million in the criticized category, $3.6 million in the classified – substandard category, $19.9 million in the classified – nonaccrual category, and $0.7 million in the classified – doubtful category. Old National considers the performance of the loan portfolio and its impact on the allowance for loan losses. For residential and consumer loan classes, Old National also evaluates credit quality based on the aging status of the loan and by payment activity. The following table presents the recorded investment in residential and consumer loans based on payment activity as of December 31, 2016 and 2015: (dollars in thousands) Consumer Residential Home Auto Other 2016 Performing $ 2,069,856 $ 472,008 $ 1,166,114 $ 223,786 Nonperforming 17,674 4,431 1,623 7,068 Total $ 2,087,530 $ 476,439 $ 1,167,737 $ 230,854 2015 (1) Performing $ 1,645,293 $ 410,243 $ 1,048,763 $ 138,031 Nonperforming 16,042 3,051 1,573 1,497 Total $ 1,661,335 $ 413,294 $ 1,050,336 $ 139,528 (1) Includes loans previously covered by loss share agreements with the FDIC. Other consumer loans as of December 31, 2016 in the table above includes loans attributable to the acquisition of Anchor totaling $5.8 million in the nonperforming category, the majority of which are student loans that are guaranteed by the government from 97% to 100%. Impaired Loans Large commercial credits are subject to individual evaluation for impairment. Retail credits and other small balance credits that are part of a homogeneous group are not tested for individual impairment unless they are modified as a troubled debt restructuring. A loan is considered impaired when it is probable that contractual interest and principal payments will not be collected either for the amounts or by the dates as scheduled in the loan agreement. If a loan is impaired, a portion of the allowance is allocated so that the loan is reported net, at the present value of estimated cash flows using the loan’s existing rate or at the fair value of collateral if repayment is expected solely from the collateral. Old National’s policy, for all but purchased credit impaired loans, is to recognize interest income on impaired loans unless the loan is placed on nonaccrual status. The following table shows Old National’s impaired loans as of December 31, 2016 and 2015, respectively. Only purchased loans that have experienced subsequent impairment since the date acquired are included in the table below. (dollars in thousands) Recorded Unpaid Related December 31, 2016 With no related allowance recorded: Commercial $ 29,001 $ 29,634 $ — Commercial Real Estate - Other 30,585 32,413 — Residential 1,610 1,631 — Consumer 827 946 — With an allowance recorded: Commercial 16,959 17,283 4,561 Commercial Real Estate - Construction 467 467 107 Commercial Real Estate - Other 26,178 26,710 3,330 Residential 1,081 1,081 54 Consumer 1,924 1,924 96 Total $ 108,632 $ 112,089 $ 8,148 December 31, 2015 (1) With no related allowance recorded: Commercial $ 40,414 $ 41,212 $ — Commercial Real Estate - Other 26,998 30,264 — Residential 1,383 1,422 — Consumer 1,201 1,305 — With an allowance recorded: Commercial 16,377 16,483 7,111 Commercial Real Estate - Construction 237 237 6 Commercial Real Estate - Other 14,752 14,802 4,015 Residential 985 985 49 Consumer 2,525 2,525 126 Total $ 104,872 $ 109,235 $ 11,307 (1) Does not include $4.2 million of loans that were previously covered by loss share agreements with the FDIC. The average balance of impaired loans for the years ended December 31, 2016 and 2015 are included in the table below. (dollars in thousands) 2016 2015 (1) Average Recorded Investment With no related allowance recorded: Commercial $ 34,708 $ 33,678 Commercial Real Estate - Construction — 1,085 Commercial Real Estate - Other 28,793 28,637 Residential 1,355 985 Consumer 855 943 With an allowance recorded: Commercial 16,669 11,924 Commercial Real Estate - Construction 352 168 Commercial Real Estate - Other 20,465 14,593 Residential 1,074 1,230 Consumer 2,367 2,034 Total $ 106,638 $ 95,277 (1) Does not include $4.2 million of loans that were previously covered by loss share agreements with the FDIC. The Company does not record interest on nonaccrual loans until principal is recovered. Interest income recognized on impaired loans during 2016 and 2015 was immaterial. For all loan classes, a loan is generally placed on nonaccrual status when principal or interest becomes 90 days past due unless it is well secured and in the process of collection, or earlier when concern exists as to the ultimate collectibility of principal or interest. Interest accrued during the current year on such loans is reversed against earnings. Interest accrued in the prior year, if any, is charged to the allowance for loan losses. Cash interest received on these loans is applied to the principal balance until the principal is recovered or until the loan returns to accrual status. Loans may be returned to accrual status when all the principal and interest amounts contractually due are brought current, remain current for a prescribed period, and future payments are reasonably assured. Loans accounted for under FASB ASC Topic 310-30 re-estimation Old National’s past due financing receivables as of December 31 were as follows: (dollars in thousands) 30-59 Days 60-89 Days Recorded Nonaccrual Total Current December 31, 2016 Commercial $ 847 $ 279 $ 23 $ 56,585 $ 57,734 $ 1,859,365 Commercial Real Estate: Construction — — — 2,769 2,769 196,740 Other 1,652 150 — 41,257 43,059 2,888,285 Residential 17,786 3,770 2 17,674 39,232 2,048,298 Consumer: Home equity 1,511 423 — 4,431 6,365 470,074 Auto 5,903 1,037 242 1,623 8,805 1,158,932 Other 3,561 1,919 61 7,068 12,609 218,245 Total $ 31,260 $ 7,578 $ 328 $ 131,407 $ 170,573 $ 8,839,939 December 31, 2015 Commercial $ 802 $ 100 $ 565 $ 57,536 $ 59,003 $ 1,745,612 Commercial Real Estate: Construction — — — 749 749 184,700 Other 438 135 — 46,601 47,174 1,615,198 Residential 9,300 2,246 114 14,953 26,613 1,618,001 Consumer: Home equity 283 402 — 2,369 3,054 356,900 Auto 3,804 730 202 1,573 6,309 1,044,027 Other 830 165 25 1,256 2,276 131,202 Covered loans 809 312 10 7,336 8,467 99,120 Total $ 16,266 $ 4,090 $ 916 $ 132,373 $ 153,645 $ 6,794,760 Loan Participations Old National has loan participations, which qualify as participating interests, with other financial institutions. At December 31, 2016, these loans totaled $424.7 million, of which $227.5 million had been sold to other financial institutions and $197.2 million was retained by Old National. The loan participations convey proportionate ownership rights with equal priority to each participating interest holder, involve no recourse (other than ordinary representations and warranties) to, or subordination by, any participating interest holder, all cash flows are divided among the participating interest holders in proportion to each holder’s share of ownership, and no holder has the right to pledge the entire financial asset unless all participating interest holders agree. Troubled Debt Restructurings Old National may choose to restructure the contractual terms of certain loans. The decision to restructure a loan, versus aggressively enforcing the collection of the loan, may benefit Old National by increasing the ultimate probability of collection. Any loans that are modified are reviewed by Old National to identify if a troubled debt restructuring (“TDR”) has occurred, which is when for economic or legal reasons related to a borrower’s financial difficulties, the Bank grants a concession to the borrower that it would not otherwise consider. Terms may be modified to fit the ability of the borrower to repay in line with its current financial status. The modification of the terms of such loans include one or a combination of the following: a reduction of the stated interest rate of the loan, an extension of the maturity date at a stated rate of interest lower than the current market rate of new debt with similar risk, or a permanent reduction of the recorded investment of the loan. Loans modified in a TDR are typically placed on nonaccrual status until we determine the future collection of principal and interest is reasonably assured, which generally requires that the borrower demonstrate a period of performance according to the restructured terms for six months. If we are unable to resolve a nonperforming loan issue, the credit will be charged off when it is apparent there will be a loss. For large commercial type loans, each relationship is individually analyzed for evidence of apparent loss based on quantitative benchmarks or subjectively based upon certain events or particular circumstances. Old National charges off small commercial loans scored through our small business credit center with contractual balances under $250,000 that have been placed on nonaccrual status or became 90 days or more delinquent, without regard to the collateral position. For residential and consumer loans, a charge off is recorded at the time foreclosure is initiated or when the loan becomes 120 to 180 days past due, whichever is earlier. For commercial TDRs, an allocated reserve is established within the allowance for loan losses for the difference between the carrying value of the loan and its computed value. To determine the value of the loan, one of the following methods is selected: (1) the present value of expected cash flows discounted at the loan’s original effective interest rate, (2) the loan’s observable market price, or (3) the fair value of the collateral value, if the loan is collateral dependent. The allocated reserve is established as the difference between the carrying value of the loan and the collectable value. If there are significant changes in the amount or timing of the loan’s expected future cash flows, impairment is recalculated and the valuation allowance is adjusted accordingly. When a residential or consumer loan is identified as a troubled debt restructuring, the loan is typically written down to its collateral value less selling costs. The following table presents activity in TDRs for the years ended December 31, 2016, 2015, and 2014: (dollars in thousands) Commercial Commercial Residential Consumer Total 2016 Balance at January 1, 2016 $ 23,354 $ 14,602 $ 2,693 $ 3,602 $ 44,251 (Charge-offs)/recoveries (1,982 ) 953 42 (6 ) (993 ) Payments (21,956 ) (10,157 ) (513 ) (1,381 ) (34,007 ) Additions 14,996 11,130 761 385 27,272 Interest collected on nonaccrual loans 2,390 1,799 2 2 4,193 Balance at December 31, 2016 $ 16,802 $ 18,327 $ 2,985 $ 2,602 $ 40,716 2015 Balance at January 1, 2015 $ 15,205 $ 15,226 $ 2,063 $ 2,459 $ 34,953 (Charge-offs)/recoveries 872 1,064 (64 ) 3 1,875 Payments (29,913 ) (6,273 ) (658 ) (1,168 ) (38,012 ) Additions 37,190 4,585 1,352 2,308 45,435 Balance at December 31, 2015 $ 23,354 $ 14,602 $ 2,693 $ 3,602 $ 44,251 2014 Balance at January 1, 2014 $ 22,443 $ 22,639 $ 2,344 $ 1,441 $ 48,867 (Charge-offs)/recoveries 126 795 10 (102 ) 829 Payments (18,281 ) (9,722 ) (466 ) (466 ) (28,935 ) Additions 13,696 3,554 175 1,586 19,011 Removals - subsequent restructuring (2,779 ) (2,040 ) — — (4,819 ) Balance at December 31, 2014 $ 15,205 $ 15,226 $ 2,063 $ 2,459 $ 34,953 Approximately $26.3 million of the TDRs at December 31, 2016 were included with nonaccrual loans, compared to $30.0 million at December 31, 2015. Old National has allocated specific reserves to customers whose loan terms have been modified in TDRs totaling $4.0 million at December 31, 2016 and $2.3 million at December 31, 2015. As of December 31, 2016, Old National had committed to lend an additional $6.0 million to customers with outstanding loans that are classified as TDRs. The pre-modification (dollars in thousands) Number of Loans Pre-modification Outstanding Recorded Investment Post-modification Outstanding Recorded Investment 2016 Troubled Debt Restructuring: Commercial 20 $ 14,996 $ 14,996 Commercial Real Estate - Other 10 11,130 11,130 Residential 6 761 761 Consumer 8 385 385 Total 44 $ 27,272 $ 27,272 2015 Troubled Debt Restructuring: Commercial 42 $ 37,190 $ 37,190 Commercial Real Estate - Construction 5 1,162 1,162 Commercial Real Estate - Other 27 3,423 3,423 Residential 13 1,352 1,352 Consumer 32 2,308 2,308 Total 119 $ 45,435 $ 45,435 2014 Troubled Debt Restructuring: Commercial 32 $ 13,696 $ 13,696 Commercial Real Estate - Construction 1 484 484 Commercial Real Estate - Other 34 3,070 3,070 Residential 2 175 175 Consumer 28 1,586 1,586 Total 97 $ 19,011 $ 19,011 The TDRs that occurred during 2016 decreased the allowance for loan losses by $2.3 million due to a change in collateral position on a large commercial loan and resulted in $0.8 million of charge-offs during 2016. The TDRs that occurred during 2015 decreased the allowance for loan losses by $0.8 million and resulted in charge-offs of $0.2 million during 2015. The TDRs that occurred during 2014 increased the allowance for loan losses by $0.5 million and resulted in charge-offs of $0.1 million during 2014. A loan is considered to be in payment default once it is 90 days contractually past due under the modified terms. There were 7 commercial loans and 1 commercial real estate loan totaling $0.3 million that were modified as TDRs within the preceding twelve months, and for which there was a payment default during 2016. There were 5 commercial loans and 5 commercial real estate loans totaling $1.4 million that were modified as TDRs within the preceding twelve months, and for which there was a payment default during 2015. There were no loans that were modified as TDRs during 2014 for which there was a payment default within the preceding twelve months. The terms of certain other loans were modified during 2016 that did not meet the definition of a TDR. It is our process to review all classified and criticized loans that, during the period, have been renewed, have entered into a forbearance agreement, have gone from principal and interest to interest only, or have extended the maturity date. In order to determine whether a borrower is experiencing financial difficulty, an evaluation is performed of the probability that the borrower will be in payment default on its debt in the foreseeable future without the modification. The evaluation is performed under our internal underwriting policy. We also evaluate whether a concession has been granted or if we were adequately compensated through a market interest rate, additional collateral or a bona fide guarantee. We also consider whether the modification was insignificant relative to the other terms of the agreement or the delay in a payment. PCI loans are not considered impaired until after the point at which there has been a degradation of cash flows below our expected cash flows at acquisition. If a PCI loan is subsequently modified, and meets the definition of a TDR, it will be removed from PCI accounting and accounted for as a TDR only if the PCI loan was being accounted for individually. If the purchased credit impaired loan is being accounted for as part of a pool, it will not be removed from the pool. As of December 31, 2016, it has not been necessary to remove any loans from PCI accounting. In general, once a modified loan is considered a TDR, the loan will always be considered a TDR, and therefore impaired, until it is paid in full, otherwise settled, sold or charged off. However, guidance also permits for loans to be removed from TDR status when subsequently restructured under these circumstances: (1) at the time of the subsequent restructuring, the borrower is not experiencing financial difficulties, and this is documented by a current credit evaluation at the time of the restructuring, (2) under the terms of the subsequent restructuring agreement, the institution has granted no concession to the borrower; and (3) the subsequent restructuring agreement includes market terms that are no less favorable than those that would be offered for a comparable new loan. For loans subsequently restructured that have cumulative principal forgiveness, the loan should continue to be measured in accordance with ASC 310-10, 310-40-50-2, Purchased Credit Impaired Loans (“PCI”) Purchased loans acquired in a business combination are recorded at estimated fair value on their purchase date with no carryover of the related allowance for loan and lease losses. In determining the estimated fair value of purchased loans, management considers a number of factors including, among others, the remaining life of the acquired loans, estimated prepayments, estimated loss ratios, estimated value of the underlying collateral, and net present value of cash flows expected to be received. Purchased loans are accounted for in accordance with guidance for certain loans acquired in a transfer (ASC 310-30), non-accretable Old National has purchased loans for which there was, at acquisition, evidence of deterioration of credit quality since origination and it was probable, at acquisition, that all contractually required payments would not be collected. For these loans that meet the criteria of ASC 310-30 December 31, (dollars in thousands) 2016 2015 (1) Commercial $ 850 $ 3,584 Commercial real estate 32,774 47,923 Residential 13,580 16,704 Consumer 8,215 12,870 Carrying amount 55,419 81,081 Allowance for loan losses (278 ) (1,359 ) Carrying amount, net of allowance $ 55,141 $ 79,722 (1) Includes loans previously covered by loss share agreements with the FDIC. The outstanding balance of loans accounted for under ASC 310-30, The accretable difference on purchased loans acquired in a business combination is the difference between the expected cash flows and the net present value of expected cash flows with such difference accreted into earnings using the effective yield method over the term of the loans. Accretion recorded as loan interest income totaled $23.4 million during 2016 and $35.5 million during 2015. Improvement in cash flow expectations has resulted in a reclassification from nonaccretable difference to accretable yield as shown in the table below. Accretable yield of purchased credit impaired loans, or income expected to be collected, was as follows: (dollars in thousands) 2016 2015 2014 Balance at January 1, $ 45,310 $ 62,533 $ 101,502 New loans purchased 3,217 1,812 8,274 Accretion of income (23,447 ) (35,526 ) (77,929 ) Reclassifications from (to) nonaccretable difference 10,589 14,189 27,536 Disposals/other adjustments (2,066 ) 2,302 3,150 Balance at December 31, $ 33,603 $ 45,310 $ 62,533 Included in Old National’s allowance for loan losses is $0.3 million related to the purchased loans disclosed above at December 31, 2016, compared to $1.4 million at December 31, 2015. PCI loans purchased during 2016 and 2015 for which it was probable at acquisition that all contractually required payments would not be collected were as follows: (dollars in thousands) Anchor (1) Founders (2) Contractually required payments $ 29,544 $ 11,103 Nonaccretable difference (6,153 ) (2,684 ) Cash flows expected to be collected at acquisition 23,391 8,419 Accretable yield (3,217 ) (1,812 ) Fair value of acquired loans at acquisition $ 20,174 $ 6,607 (1) Old National acquired Anchor effective May 1, 2016. (2) Old National acquired Founders effective January 1, 2015. Income would not be recognized on certain purchased loans if Old National could not reasonably estimate cash flows to be collected. Old National had no purchased loans for which it could not reasonably estimate cash flows to be collected.

Covered Loans

Covered Loans	12 Months Ended
	Dec. 31, 2016
Text Block [Abstract]
Covered Loans	NOTE 7 – COVERED LOANS Old National entered into an agreement with the FDIC on June 22, 2016 to terminate its loss share agreements. As a result of the termination of the loss share agreements, the remaining loans that were covered by the loss share arrangements were reclassified to noncovered loans effective June 22, 2016. All future gains and losses associated with covered loans will be recognized entirely by Old National. Prior to the termination of the loss share agreements, certain loans acquired from the FDIC were classified as covered loans. Covered loans were subject to loss share agreements. Under the early termination agreement, the FDIC made a final payment of $8.7 million to Old National as consideration for the early termination. After the elimination of the remaining FDIC indemnification asset and the payment of settlement charges, Old National realized a pre-tax The following table is a roll-forward of covered acquired impaired loans accounted for under ASC 310-30 (dollars in thousands) Contractual Nonaccretable Accretable Carrying 2016 Balance at January 1, 2016 $ 69,857 $ (4,729 ) $ (17,785 ) $ 47,343 Principal reductions and interest payments (18,195 ) (347 ) — (18,542 ) Accretion of loan discount — — 7,196 7,196 Changes in contractual and expected cash flows due to remeasurement 4,431 631 (4,927 ) 135 Removals due to foreclosure or sale (1,948 ) 136 263 (1,549 ) Loans removed from loss share coverage (54,145 ) 4,309 15,253 (34,583 ) Balance at December 31, 2016 $ — $ — $ — $ — 2015 Balance at January 1, 2015 $ 124,809 $ (12,014 ) $ (35,742 ) $ 77,053 Principal reductions and interest payments (43,792 ) (1,666 ) — (45,458 ) Accretion of loan discount — — 21,529 21,529 Changes in contractual and expected cash flows due to remeasurement (4,139 ) 8,409 (4,109 ) 161 Removals due to foreclosure or sale (1,316 ) 463 (244 ) (1,097 ) Loans removed from loss share coverage (5,705 ) 79 781 (4,845 ) Balance at December 31, 2015 $ 69,857 $ (4,729 ) $ (17,785 ) $ 47,343 (1) The balance of contractual cash flows includes future contractual interest and is net of amounts charged off and interest collected on nonaccrual loans. (2) Carrying amount for this table is net of allowance for loan losses. Prior to the termination of the loss share agreements, we estimated the cash flows expected to be collected on individual loans or on pools of loans sharing common risk characteristics which were treated in the aggregate when applying various valuation techniques. We evaluated at each balance sheet date whether the present value of loans determined using the effective interest rates had decreased and if so, recognized a provision for loan losses. For any increases in cash flows expected to be collected, we adjusted the amount of accretable yield recognized on a prospective basis over the loan’s or pool’s remaining life. Eighty percent of the prospective yield adjustments were offset as Old National would recognize a corresponding change in cash flows expected from the indemnification asset prospectively in a similar manner. The indemnification asset was adjusted over the shorter of the life of the underlying investment or the indemnification agreement. The loss share receivable represented actual incurred losses where reimbursement had not yet been received from the FDIC. The indemnification asset represented future cash flows we expected to collect from the FDIC under the loss sharing agreements and the amount related to the estimated improvements in cash flow expectations that were being amortized over the same period for which those improved cash flows were being accreted into income. The following table shows a detailed analysis of the FDIC loss sharing asset for the years ended December 31, 2016 and 2015. As a result of the termination of the loss share agreements on June 22, 2016, the table below reflects the write-off (dollars in thousands) 2016 2015 Balance at January 1, $ 9,030 $ 20,603 Adjustments not reflected in income: Cash received from the FDIC (10,000 ) (3,548 ) Other 512 1,009 Adjustments reflected in income: Amortization (816 ) (10,709 ) Higher (lower) loan loss expectations (13 ) 275 Impairment/(recovery) of value and net (gain)/loss on sales of other real estate 1,062 1,400 Gain as a result of the early termination agreement with the FDIC, effective June 22, 2016 225 — Balance at December 31, $ — $ 9,030

Other Real Estate Owned

Other Real Estate Owned	12 Months Ended
	Dec. 31, 2016
Banking and Thrift [Abstract]
Other Real Estate Owned	NOTE 8 – OTHER REAL ESTATE OWNED The following table presents activity in other real estate owned for the years ended December 31, 2016 and 2015: (dollars in thousands) Other Real Estate Other Real Estate 2016 Balance at January 1, 2016 $ 7,594 $ 4,904 Additions (2) 22,905 2,093 Sales (13,638 ) (1,454 ) (Impairment)/recovery of value (1,986 ) (1,872 ) Reclassification due to termination of the loss share agreements, effective June 22, 2016 3,671 (3,671 ) Balance at December 31, 2016 $ 18,546 $ — 2015 Balance at January 1, 2015 $ 7,241 $ 9,121 Additions 5,665 1,487 Sales (5,710 ) (5,373 ) (Impairment)/recovery of value 398 (331 ) Balance at December 31, 2015 $ 7,594 $ 4,904 (1) Includes repossessed personal property of $0.3 million at December 31, 2016 and $0.2 million at December 31, 2015. (2) Includes other real estate owned of $17.3 million acquired from Anchor in May 2016. At December 31, 2016, foreclosed residential real estate property included in the table above totaled $1.8 million. At December 31, 2016, consumer mortgage loans collateralized by residential real property that were in the process of foreclosure totaled $2.8 million. Old National entered into an agreement with the FDIC on June 22, 2016 to terminate its loss share agreements. As a result of the termination of the loss share agreements, the remaining other real estate owned that was covered by the loss share arrangements were reclassified to noncovered other real estate owned effective June 22, 2016. Prior to the termination of the loss share agreements, covered OREO expenses and valuation write-downs were recorded in the noninterest expense section of the consolidated statements of income. Under the loss sharing agreements, the FDIC would have reimbursed us for 80% of expenses and valuation write-downs related to covered assets up to $275.0 million, an amount which we never reached. The reimbursable portion of these expenses was recorded in the FDIC indemnification asset. As a result of the termination of the loss share agreements, all future gains and losses associated with covered assets will be recognized entirely by Old National since the FDIC will no longer be sharing in these gains and losses.

Premises and Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Premises and Equipment	NOTE 9 – PREMISES AND EQUIPMENT The composition of premises and equipment was as follows at December 31: (dollars in thousands) 2016 2015 Land $ 71,769 $ 41,604 Buildings 322,165 111,982 Furniture, fixtures, and equipment 102,631 94,819 Leasehold improvements 28,555 33,111 Total 525,120 281,516 Accumulated depreciation (95,498 ) (84,840 ) Premises and equipment, net $ 429,622 $ 196,676 During 2016, the Company purchased certain bank properties that it had previously leased, including its executive offices, for an aggregate purchase price of $196.1 million. Also contributing to the increase in premises and equipment at December 31, 2016 were $35.7 million of assets attributable to the Anchor acquisition. Depreciation expense was $16.6 million in 2016, $14.1 million in 2015, and $12.4 million in 2014. Operating Leases Old National rents certain premises and equipment under operating leases, which expire at various dates. Many of these leases require the payment of property taxes, insurance premiums, maintenance, and other costs. In some cases, rentals are subject to increase in relation to a cost-of-living sub-lease Rent expense was $25.4 million in 2016, $29.1 million in 2015, and $29.0 million in 2014. The following is a summary of future minimum lease commitments as of December 31, 2016: (dollars in thousands) 2017 $ 16,928 2018 15,918 2019 15,262 2020 14,679 2021 14,161 Thereafter 79,881 Total $ 156,829 Old National purchased 23 properties during 2016 that it had previously leased, 20 of which had deferred gains that were accelerated when the associated leases were terminated. These gains were partially offset by the recognition of deferred rent expense, cease-use Old National purchased 14 properties during 2015 that it had previously leased, all of which had deferred gains that were accelerated when the associated leases were terminated. These gains were partially offset by the recognition of deferred rent expense and other expense, resulting in a net gain of $10.8 million. Old National had deferred gains remaining associated with prior sale leaseback transactions totaling $10.3 million as of December 31, 2016 and $40.7 million as of December 31, 2015. The gains will be recognized over the remaining term of the leases. The leases had original terms ranging from five to twenty-four years. Capital Leases Old National leases a branch building and certain equipment under capital leases. See Note 16 to the consolidated financial statements for detail regarding these leases.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	NOTE 10 – GOODWILL AND OTHER INTANGIBLE ASSETS The following table shows the changes in the carrying amount of goodwill for the years ended December 31, 2016 and 2015: (dollars in thousands) 2016 2015 Balance at January 1, $ 584,634 $ 530,845 Acquisitions 111,347 57,619 Divestitures (40,963 ) (3,830 ) Balance at December 31, $ 655,018 $ 584,634 Goodwill is reviewed annually for impairment. Old National completed its most recent annual goodwill impairment test as of August 31, 2016 and concluded that, based on current events and circumstances, it is not more likely than not that the carrying value of goodwill exceeds fair value. During 2016, Old National recorded $111.3 million of goodwill associated with the acquisition of Anchor. Also during 2016, Old National eliminated $41.0 million of goodwill associated with the sale of its insurance operations. See Note 2 to the consolidated financial statements for detail regarding goodwill recorded in 2015 associated with acquisitions. The gross carrying amounts and accumulated amortization of other intangible assets at December 31, 2016 and 2015 was as follows: (dollars in thousands) Gross Accumulated Net 2016 Amortized intangible assets: Core deposit $ 81,663 $ (53,214 ) $ 28,449 Customer trust relationships 16,547 (7,753 ) 8,794 Customer loan relationships 4,413 (3,979 ) 434 Total intangible assets $ 102,623 $ (64,946 ) $ 37,677 2015 Amortized intangible assets: Core deposit $ 60,103 $ (43,982 ) $ 16,121 Customer business relationships 30,787 (23,341 ) 7,446 Customer trust relationships 16,547 (5,286 ) 11,261 Customer loan relationships 4,413 (3,933 ) 480 Total intangible assets $ 111,850 $ (76,542 ) $ 35,308 Other intangible assets consist of core deposit intangibles and customer relationship intangibles and are being amortized primarily on an accelerated basis over their estimated useful lives, generally over a period of 5 to 15 years. During 2016, Old National increased core deposit intangibles by $21.6 million related to the Anchor acquisition. In addition, Old National eliminated $6.7 million of customer business relationship intangibles associated with its insurance operation, which was sold May 31, 2016. Old National reviews other intangible assets for possible impairment whenever events or changes in circumstances indicate that carrying amounts may not be recoverable. No impairment charges were recorded in 2016, 2015, or 2014. Total amortization expense associated with intangible assets was $12.5 million in 2016, $11.7 million in 2015, and $9.1 million in 2014. Estimated amortization expense for future years is as follows: (dollars in thousands) 2017 $ 11,015 2018 8,687 2019 6,737 2020 4,883 2021 3,111 Thereafter 3,244 Total $ 37,677

Loan Servicing Rights

Loan Servicing Rights	12 Months Ended
	Dec. 31, 2016
Text Block [Abstract]
Loan Servicing Rights	NOTE 11 – LOAN SERVICING RIGHTS Loan servicing rights were assumed in Old National’s acquisitions of United and LSB in 2014, Founders in 2015, and Anchor in May, 2016. See Note 2 to the consolidated financial statements for detail regarding loan servicing rights recorded associated with these acquisitions. At December 31, 2016, loan servicing rights derived from loans sold with servicing retained totaled $25.6 million, compared to $10.5 million at December 31, 2015. Loans serviced for others are not reported as assets. The principal balance of loans serviced for others was $3.385 billion at December 31, 2016, compared to $1.263 billion at December 31, 2015. Approximately 99% of the loans serviced for others at December 31, 2016 were residential mortgage loans. Custodial escrow balances maintained in connection with serviced loans were $5.3 million at December 31, 2016 and $3.0 million at December 31, 2015. The following table summarizes the activity related to loan servicing rights and the related valuation allowance in 2016 and 2015: (dollars in thousands) 2016 2015 Balance at January 1, $ 10,502 $ 9,584 Additions (1) 20,280 3,187 Amortization (5,153 ) (2,269 ) Balance before valuation allowance at December 31, 25,629 10,502 Valuation allowance: Balance at January 1, (34 ) (50 ) (Additions)/recoveries (34 ) 16 Balance at December 31, (68 ) (34 ) Loan servicing rights, net $ 25,561 $ 10,468 (1) In May 2016, the Company assumed $15.3 million of loan servicing rights related to the Anchor acquisition. At December 31, 2016, the fair value of servicing rights was $26.8 million, which was determined using a discount rate of 13% and a weighted average prepayment speed of 136% PSA. At December 31, 2015, the fair value of servicing rights was $11.3 million, which was determined using a discount rate of 11% and a weighted average prepayment speed of 166% PSA.

Qualified Affordable Housing Pr

Qualified Affordable Housing Projects and Other Tax Credit Investments	12 Months Ended
	Dec. 31, 2016
Accounting Policies [Abstract]
Qualified Affordable Housing Projects and Other Tax Credit Investments	NOTE 12 – QUALIFIED AFFORDABLE HOUSING PROJECTS AND OTHER TAX CREDIT INVESTMENTS The Company is a limited partner in several tax-advantaged pre-tax The following table summarizes Old National’s investments in Low Income Housing Tax Credits (“LIHTC”), Federal Historic Tax Credits (“FHTC”), Federal New Market Tax Credits (“NMTC”), and Indiana Community Revitalization Enhancement District Tax Credits (“CReED”) at December 31, 2016: (dollars in thousands) Years Ended Years Ended At December 31, 2016 2016 2015 2016 2015 Investment Accounting Method Investment Unfunded Amortization Tax Benefit LIHTC and other qualifying investments Proportional amortization $ 29,110 $ 16,210 $ 804 $ 804 $ (1,125 ) $ (1,125 ) FHTC Equity 4,434 3,104 — — — — CReED Equity 1,504 1,502 — — — — NMTC Equity — — — 143 — (233 ) Total $ 35,048 $ 20,816 $ 804 $ 947 $ (1,125 ) $ (1,358 ) (1) All commitments will be paid by the Company by 2027. At December 31, 2015, the Company’s qualified affordable housing projects and other tax credit investments totaled $9.8 million, with no unfunded commitments.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2016
Banking and Thrift [Abstract]
Deposits	NOTE 13 - DEPOSITS The aggregate amount of time deposits in denominations of $250,000 or more was $313.8 million at December 31, 2016 and $103.8 million at December 31, 2015. At December 31, 2016, the scheduled maturities of total time deposits were as follows: (dollars in thousands) Due in 2017 $ 895,033 Due in 2018 292,371 Due in 2019 108,978 Due in 2020 86,090 Due in 2021 44,005 Thereafter 41,631 Total $ 1,468,108

Securities Sold Under Agreement

Securities Sold Under Agreements to Repurchase	12 Months Ended
	Dec. 31, 2016
Transfers and Servicing [Abstract]
Securities Sold Under Agreements to Repurchase	NOTE 14 – SECURITES SOLD UNDER AGREEMENTS TO REPURCHASE Securities sold under agreements to repurchase are secured borrowings. The Company pledges investment securities to secure these borrowings. The following table presents securities sold under agreements to repurchase and related weighted-average interest rates for each of the years ended December 31: (dollars in thousands) 2016 2015 Outstanding at year-end $ 367,052 $ 387,409 Average amount outstanding 368,757 406,117 Maximum amount outstanding at any month-end 396,695 419,515 Weighted average interest rate: During year 0.41 % 0.37 % End of year 0.47 0.38 The following table presents the contractual maturity of our secured borrowings and class of collateral pledged: At December 31, 2016 Remaining Contractual Maturity of the Agreements (dollars in thousands) Overnight and Up to 30 Days 30-90 Days Greater Than Total Repurchase Agreements: U.S. Treasury and agency securities $ 317,052 $ 25,000 $ — $ 25,000 $ 367,052 Total $ 317,052 $ 25,000 $ — $ 25,000 $ 367,052 The fair value of securities pledged to secure repurchase agreements may decline. The Company has pledged securities valued at 111% of the gross outstanding balance of repurchase agreements at December 31, 2016 to manage this risk.

Federal Home Loan Bank Advances

Federal Home Loan Bank Advances	12 Months Ended
	Dec. 31, 2016
Banking and Thrift [Abstract]
Federal Home Loan Bank Advances	NOTE 15 – FEDERAL HOME LOAN BANK ADVANCES The following table summarizes Old National Bank’s FHLB advances at December 31: (dollars in thousands) 2016 2015 Federal Home Loan Bank advances (fixed rates 0.56% to 6.76% and variable rates 0.99% to 1.05%) maturing January 2017 to January 2025 $ 1,353,225 $ 1,022,766 ASC 815 fair value hedge and other basis adjustments (133 ) 725 Total other borrowings $ 1,353,092 $ 1,023,491 FHLB advances had weighted-average rates of 0.94% at December 31, 2016 and 0.72% at December 31, 2015. These borrowings are collateralized by investment securities and residential real estate loans up to 140% of outstanding debt. Contractual maturities of FHLB advances at December 31, 2016, were as follows: (dollars in thousands) Due in 2017 $ 945,544 Due in 2018 170,090 Due in 2019 2,415 Due in 2020 50,000 Due in 2021 — Thereafter 185,176 ASC 815 fair value hedge and other basis adjustments (133 ) Total $ 1,353,092

Other Borrowings

Other Borrowings	12 Months Ended
	Dec. 31, 2016
Other Liabilities Disclosure [Abstract]
Other Borrowings	NOTE 16 – OTHER BORROWINGS The following table summarizes Old National and its subsidiaries’ other borrowings at December 31: (dollars in thousands) 2016 2015 Old National Bancorp: Senior unsecured bank notes (fixed rate 4.125%) $ 175,000 $ 175,000 maturing August 2024 Unamortized debt issuance costs related to Senior unsecured bank notes (1,182 ) (1,338 ) Junior subordinated debentures (variable rates of 2.30% to 2.74%) maturing March 2035 to September 2037 45,000 45,000 Other basis adjustments (3,971 ) (4,442 ) Old National Bank: Capital lease obligation 4,092 4,036 Total other borrowings $ 218,939 $ 218,256 Contractual maturities of other borrowings at December 31, 2016, were as follows: (dollars in thousands) Due in 2017 $ 196 Due in 2018 79 Due in 2019 85 Due in 2020 91 Due in 2021 99 Thereafter 223,542 Unamortized debt issuance costs and other basis adjustments (5,153 ) Total $ 218,939 Senior Notes In August 2014, Old National issued $175.0 million of senior unsecured notes with a 4.125% interest rate. These notes pay interest on February 15 and August 15. The notes mature on August 15, 2024. Junior Subordinated Debentures Junior subordinated debentures related to trust preferred securities are classified in “other borrowings”. These securities qualify as Tier 1 capital for regulatory purposes, subject to certain limitations. In 2007, Old National acquired St. Joseph Capital Trust II in conjunction with its acquisition of St. Joseph Capital Corporation. Old National guarantees the payment of distributions on the trust preferred securities issued by St. Joseph Capital Trust II. St. Joseph Capital Trust II issued $5.0 million in preferred securities in March 2005. The preferred securities have a variable rate of interest priced at the three-month London Interbank Offered Rate (“LIBOR”) plus 175 basis points, payable quarterly and maturing on March 17, 2035. Proceeds from the issuance of these securities were used to purchase junior subordinated debentures with the same financial terms as the securities issued by St. Joseph Capital Trust II. In 2011, Old National acquired Monroe Bancorp Capital Trust I and Monroe Bancorp Statutory Trust II in conjunction with its acquisition of Monroe Bancorp. Old National guarantees the payment of distributions on the trust preferred securities issued by Monroe Bancorp Capital Trust I and Monroe Bancorp Statutory Trust II. Monroe Bancorp Capital Trust I issued $3.0 million in preferred securities in July 2006. The preferred securities have a variable rate of interest priced at the three-month LIBOR plus 160 basis points. Proceeds from the issuance of these securities were used to purchase junior subordinated debentures with the same financial terms as the securities issued by Monroe Bancorp Capital Trust I. Monroe Bancorp Statutory Trust II issued $5.0 million in preferred securities in March 2007. The preferred securities have a variable rate of interest priced at the three-month LIBOR plus 160 basis points. Proceeds from the issuance of these securities were used to purchase junior subordinated debentures with the same financial terms as the securities issued by Monroe Bancorp Statutory Trust II. In 2012, Old National acquired Home Federal Statutory Trust I in conjunction with its acquisition of Indiana Community Bancorp. Old National guarantees the payment of distributions on the trust preferred securities issued by Home Federal Statutory Trust I. Home Federal Statutory Trust I issued $15.0 million in preferred securities in September 2006. The preferred securities carry a variable rate of interest priced at the three-month LIBOR plus 165 basis points. Proceeds from the issuance of these securities were used to purchase junior subordinated debentures with the same financial terms as the securities issued by Home Federal Statutory Trust I. On April 25, 2014, Old National acquired Tower Capital Trust 2 and Tower Capital Trust 3 in conjunction with its acquisition of Tower Financial Corporation. Old National guarantees the payment of distributions on the trust preferred securities issued by Tower Capital Trust 2 and Tower Capital Trust 3. Tower Capital Trust 2 issued $8.0 million in preferred securities in December 2005. The preferred securities carry a variable rate of interest priced at the three-month LIBOR plus 134 basis points. Proceeds from the issuance of these securities were used to purchase junior subordinated debentures with the same financial terms as the securities issued by Tower Capital Trust 2. Tower Capital Trust 3 issued $9.0 million in preferred securities in December 2006. The preferred securities carry a variable rate of interest priced at the three-month LIBOR plus 169 basis points. Proceeds from the issuance of these securities were used to purchase junior subordinated debentures with the same financial terms as the securities issued by Tower Capital Trust 3. Old National, at any time, may redeem the junior subordinated debentures at par and thereby cause a redemption of the trust preferred securities in whole or in part. Capital Lease Obligation On January 1, 2004, Old National entered into a long-term capital lease obligation for a branch office building in Owensboro, Kentucky, which extends for 25 years with one renewal option for 10 years. The economic substance of this lease is that Old National is financing the acquisition of the building through the lease and accordingly, the building is recorded as an asset and the lease is recorded as a liability. The fair value of the capital lease obligation was estimated using a discounted cash flow analysis based on Old National’s current incremental borrowing rate for similar types of borrowing arrangements. On May 1, 2016, Old National acquired Anchor, assuming a five year capital lease obligation for equipment. At December 31, 2016, the future minimum lease payments under the capital lease arrangements were as follows: (dollars in thousands) 2017 $ 535 2018 410 2019 430 2020 430 2021 430 Thereafter 7,976 Total minimum lease payments 10,211 Less amounts representing interest (6,119 ) Present value of net minimum lease payments $ 4,092

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income Taxes	NOTE 17 – INCOME TAXES Following is a summary of the major items comprising the differences in taxes from continuing operations computed at the federal statutory rate and as recorded in the consolidated statement of income for the years ended December 31: (dollars in thousands) 2016 2015 2014 Provision at statutory rate of 35% $ 70,149 $ 57,013 $ 49,688 Tax-exempt Tax-exempt (14,356 ) (13,111 ) (11,460 ) Section 291/265 interest disallowance 191 142 93 Company-owned life insurance income (2,968 ) (3,011 ) (2,423 ) Tax-exempt (17,133 ) (15,980 ) (13,790 ) Reserve for unrecognized tax benefits (1 ) (5 ) (1,076 ) State income taxes 3,461 4,173 2,676 ONB Insurance Group, Inc. nondeductible goodwill 8,328 — — Effect of Illinois branch sale — 1,835 — State statutory rate change — — 904 Other, net 1,358 (859 ) (105 ) Income tax expense $ 66,162 $ 46,177 $ 38,297 Effective tax rate 33.0 % 28.3 % 27.0 % The higher effective tax rate in 2016 when compared to 2015 is primarily the result of the sale of ONB Insurance Group, Inc. in May 2016 and the associated tax expense of $8.3 million to record a deferred tax liability relating to ONB Insurance Group, Inc.’s nondeductible goodwill. The higher effective tax rate in 2015 when compared to 2014 is the result of an increase in taxable income, as well as tax differences arising from the sale of Illinois branches in the third quarter of 2015. The provision for income taxes consisted of the following components for the years ended December 31: (dollars in thousands) 2016 2015 2014 Income taxes currently payable: Federal $ 23,735 $ 17,385 $ 8,974 State 2,242 769 581 Deferred income taxes related to: Federal 35,955 24,664 27,207 State 4,230 3,359 1,535 Deferred income tax expense 40,185 28,023 28,742 Income tax expense $ 66,162 $ 46,177 $ 38,297 Net Deferred Tax Assets Significant components of net deferred tax assets (liabilities) were as follows at December 31: (dollars in thousands) 2016 2015 Deferred Tax Assets Allowance for loan losses, net of recapture $ 19,773 $ 17,125 Benefit plan accruals 23,846 18,066 Alternative minimum tax credit 19,523 18,378 Unrealized losses on benefit plans 205 4,507 Net operating loss carryforwards 66,917 2,041 Premises and equipment — 12,735 Federal tax credits 35 422 Other-than-temporary impairment 3,606 3,558 Acquired loans 40,522 34,870 Lease exit obligation 2,060 2,626 Unrealized losses on available-for-sale 23,365 3,002 Unrealized losses on held-to-maturity 7,118 7,724 Unrealized losses on hedges 4,116 5,685 Other real estate owned 3,310 — Other, net 2,675 4,914 Total deferred tax assets 217,071 135,653 Deferred Tax Liabilities Accretion on investment securities (700 ) (599 ) Other real estate owned — (284 ) Purchase accounting (17,552 ) (16,615 ) FDIC indemnification asset — (2,565 ) Loan servicing rights (9,627 ) (3,890 ) Premises and equipment (4,800 ) — Other, net (2,529 ) (1,716 ) Total deferred tax liabilities (35,208 ) (25,669 ) Net deferred tax assets $ 181,863 $ 109,984 Net deferred tax assets increased $71.9 million from December 31, 2015 to December 31, 2016 primarily due to the acquisition of Anchor. Net deferred tax assets acquired from Anchor totaled $98.1 million, consisting primarily of deferred tax assets related to federal and state net operating loss carryforwards and acquired loans. Through the acquisition of Anchor in the second quarter of 2016 and Lafayette Savings Bank in the fourth quarter of 2014, both former thrifts, Old National Bank’s retained earnings at December 31, 2016 include base-year bad debt reserves, created for tax purposes prior to 1988, totaling $52.8 million. Of this total, $50.9 million was acquired from Anchor, and $1.9 million was acquired from Lafayette Savings Bank. Base-year reserves are subject to recapture in the unlikely event that Old National Bank (1) makes distributions in excess of current and accumulated earnings and profits, as calculated for federal income tax purposes, (2) redeems its stock, or (3) liquidates. Old National Bank has no intention of making such a nondividend distribution. Accordingly, under current accounting principles, a related deferred income tax liability of $19.8 million has not been recognized. No valuation allowance was recorded at December 31, 2016 or 2015 because, based on current expectations, Old National believes it will generate sufficient income in future years to realize deferred tax assets. Old National has federal net operating loss carryforwards totaling $162.9 million at December 31, 2016 and $1.3 million at December 31, 2015. This federal net operating loss was acquired from the acquisition of Indiana Community Bancorp in 2012 and Anchor in 2016. If not used, the federal net operating loss carryforwards will begin to expire in 2027. Old National has alternative minimum tax credit carryforwards totaling $19.5 million at December 31, 2016 and $18.4 million at December 31, 2015. The alternative minimum tax credit carryforward does not expire. Old National has federal tax credit carryforwards of $35 thousand at December 31, 2016 and $0.4 million at December 31, 2015. The federal tax credits consist mainly of low income housing credits and research development credits that, if not used, will expire from 2027 to 2035. Old National has state net operating loss carryforwards totaling $206.3 million at December 31, 2016 and $46.3 million at December 31, 2015. If not used, the state net operating loss carryforwards will expire from 2023 to 2035. The federal and state net operating loss carryforwards are subject to an annual limitation under Internal Revenue Code section 382. Old National believes that all of the net operating loss carryforwards will be used prior to expiration. Unrecognized Tax Benefits Unrecognized state income tax benefits are reported net of their related deferred federal income tax benefit. A reconciliation of the beginning and ending amount of unrecognized tax benefits was as follows: (dollars in thousands) 2016 2015 2014 Balance at January 1, $ 124 $ 77 $ 3,847 Additions based on tax positions related to the current year 118 51 37 Additions based on tax positions related to prior years 537 — — Reductions due to statute of limitations expiring (2 ) (4 ) (3,807 ) Balance at December 31, $ 777 $ 124 $ 77 If recognized, approximately $0.8 million of unrecognized tax benefits, net of interest, would favorably affect the effective income tax rate in future periods. It is our policy to recognize interest and penalties accrued relative to unrecognized tax benefits in their respective federal or state income tax accounts. We recorded interest and penalties in the income statement of $0.1 million in 2016, $0.4 thousand in 2015, and $1.1 million in 2014. The amount accrued for interest and penalties in the balance sheet was $0.1 million at December 31, 2016 and $11 thousand at December 31, 2015. Old National and its subsidiaries file a consolidated U.S. federal income tax return, as well as filing various state returns. The 2013 through 2016 tax years are open and subject to examination. In February 2014, the Company was notified that their 2011 federal tax return was under examination. This examination was completed in 2015 and no changes were made to the Company’s reported tax. The Company reversed $2 thousand in 2016 related to uncertain tax positions accounted for under FASB ASC 740-10 Accounting for Uncertainty in Income Taxes 740-10”). The Company reversed $4 thousand in 2015 related to uncertain tax positions accounted for under FASB ASC 740-10. The Company reversed $3.8 million in 2014 related to uncertain tax positions accounted for under ASC 740-10.

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2016
Compensation and Retirement Disclosure [Abstract]
Employee Benefit Plans	NOTE 18 - EMPLOYEE BENEFIT PLANS Retirement Plan Old National had a funded noncontributory defined benefit plan (the “Retirement Plan”) that had been frozen since December 31, 2005. During the first quarter of 2016, the Company notified plan participants of its intent to terminate the Retirement Plan effective May 15, 2016. During October 2016, the Retirement Plan settled plan liabilities through either lump sum distributions to plan participants or annuity contracts purchased from a third-party insurance company that provided for the payment of vested benefits to those participants that did not elect the lump sum option. As of December 31, 2016, there were no remaining plan assets. Old National made contributions totaling $7.6 million, $0.1 million, and $0.3 million to the Retirement Plan during 2016, 2015, and 2014, respectively. As a result of the pension termination, unrecognized losses, which previously were recorded in accumulated other comprehensive loss on the consolidated balance sheets, were recognized as expense and the pension plan settlement loss of $9.8 million was recorded in the consolidated statements of income for the year ended December 31, 2016. Including this settlement charge, the total expense under the Retirement Plan was $11.6 million in 2016. Restoration Plan Old National maintains an unfunded pension restoration plan (the “Restoration Plan”) which provides benefits for eligible employees that are in excess of the limits under Section 415 of the Internal Revenue Code of 1986, as amended, that apply to the Retirement Plan. The Restoration Plan is designed to comply with the requirements of ERISA. The entire cost of the plan, which was also frozen as of December 31, 2005, is supported by contributions from the Company. The Restoration Plan is unfunded. Old National uses a December 31 measurement date. The following table presents the activity of the Restoration Plan for the years ended December 31, 2016 and 2015: (dollars in thousands) 2016 2015 Change in Projected Benefit Obligation Balance at January 1, $ 1,239 $ 1,346 Interest cost 52 45 Benefits paid (39 ) (65 ) Actuarial loss (gain) 103 (87 ) Settlement (219 ) — Projected benefit obligation at December 31, $ 1,136 $ 1,239 Change in Plan Assets Fair value at January 1, — — Employer contributions 257 65 Benefits paid (39 ) (65 ) Settlement (218 ) — Fair value of plan assets at December 31, — — Funded status at December 31, $ (1,136 ) $ (1,239 ) Amounts recognized in the statement of financial position at December 31: Accrued benefit liability $ (1,136 ) $ (1,239 ) Net amount recognized $ (1,136 ) $ (1,239 ) Amounts recognized in accumulated other comprehensive income at December 31: Net actuarial loss $ 538 $ 646 Total $ 538 $ 646 The estimated net loss for the Restoration Plan that will be amortized from accumulated other comprehensive income into net periodic benefit cost over the next fiscal year is $0.1 million. The accumulated benefit obligation and the projected benefit obligation were equivalent for the Restoration Plan and were $1.1 million at December 31, 2016 and $1.2 million at December 31, 2015. The net periodic benefit cost and its components were as follows for the years ended December 31: (dollars in thousands) 2016 2015 2014 Net Periodic Benefit Cost Interest cost $ 52 $ 45 $ 52 Recognized actuarial loss 108 122 102 Net periodic benefit cost $ 160 $ 167 $ 154 Settlement loss 103 — — Total net periodic benefit cost $ 263 $ 167 $ 154 Other Changes in Benefit Obligations Recognized in Other Comprehensive Income Net actuarial (gain)/loss $ 103 $ (87 ) $ 145 Amortization of net actuarial loss (108 ) (122 ) (102 ) Settlement loss (103 ) — — Total recognized in other comprehensive income $ (108 ) $ (209 ) $ 43 Total recognized in net periodic benefit cost and other comprehensive income $ 155 $ (42 ) $ 197 The weighted-average assumptions used to determine the benefit obligation as of the end of the years indicated and the net periodic benefit cost for the years indicated are presented in the table below. Because the plan is frozen, increases in compensation are not considered. 2016 2015 2014 Benefit obligations: Discount rate at the end of the period 4.00 % 4.50 % 4.00 % Net periodic benefit cost: Discount rate at the beginning of the period 4.50 % 4.00 % 4.75 % Rate of compensation increase N/A N/A N/A N/A = not applicable The discount rate used reflects the expected future cash flow based on Old National’s funding valuation assumptions and participant data as of the beginning of the plan year. The expected future cash flow is discounted by the Principal Pension Discount yield curve as of December 31, 2016. As of December 31, 2015, expected future benefit payments related to Old National’s Restoration Plan were as follows: (dollars in thousands) 2017 $ 210 2018 18 2019 230 2020 21 2021 52 Years 2022 - 2026 610 Old National expects to contribute cash of $0.2 million to the Restoration Plan in 2017. Employee Stock Ownership Plan The Employee Stock Ownership and Savings Plan (401k) (the “401(k) Plan”) permits employees to participate the first month following one month of service. Effective as of April 1, 2010, we suspended safe harbor matching contributions to the 401(k) Plan. However, we may make discretionary matching contributions to the 401(k) Plan. For 2016, 2015, and 2014, we matched 50% of employee compensation deferral contributions, up to 6% of compensation. In addition to matching contributions, Old National may contribute to the 401(k) Plan an amount designated as a profit sharing contribution in the form of Old National stock or cash. Our Board of Directors designated no discretionary profit sharing contributions in 2016, 2015, or 2014. All contributions vest immediately and plan participants may elect to redirect funds among any of the investment options provided under the 401(k) plan. The number of Old National shares in the 401(k) plan were 0.8 million at December 31, 2016 and 1.0 million at December 31, 2015. All shares owned through the 401(k) plan are included in the calculation of weighted-average shares outstanding for purposes of calculating diluted and basic earnings per share. Contribution expense under the 401(k) plan was $5.0 million in 2016, $4.6 million in 2015, and $4.3 million in 2014.

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	NOTE 19 – STOCK-BASED COMPENSATION Our Amended and Restated 2008 Incentive Compensation Plan (the “ICP”), which was shareholder-approved, permits the grant of share-based awards to its employees. At December 31, 2016, 4.9 million shares were available for issuance. The granting of awards to key employees is typically in the form of restricted stock awards or units. We believe that such awards better align the interests of our employees with those of our shareholders. Total compensation cost that has been charged against income for the ICPs was $7.3 million in 2016, $4.3 million in 2015, and $4.2 million in 2014. The total income tax benefit was $2.8 million in 2016 and $1.6 million in 2015 and 2014. Restricted Stock Awards Restricted stock awards require certain service requirements and commonly have vesting periods of 3 years. Compensation expense is recognized on a straight-line basis over the vesting period. Shares are subject to certain restrictions and risk of forfeiture by the participants. A summary of changes in our nonvested shares for the year follows: (shares in thousands) Shares Weighted Average Grant-Date Fair Value Nonvested balance at January 1, 2016 346 $ 13.90 Granted during the year (1) 348 12.77 Vested during the year (289 ) 13.36 Forfeited during the year (4 ) 13.26 Nonvested balance at December 31, 2016 401 $ 13.31 (1) Includes 173 thousand shares assumed in conjunction with the acquisition of Anchor in May 2016. As of December 31, 2016, there was $3.4 million of total unrecognized compensation cost related to nonvested shares granted under the ICP. The cost is expected to be recognized over a weighted-average period of 1.9 years. The total fair value of the shares vested was $3.8 million in 2016, $1.6 million in 2015, and $1.3 million in 2014. Restricted Stock Units Restricted stock units require certain performance requirements and have vesting periods of 3 years. Compensation expense is recognized on a straight-line basis over the vesting period. Shares are subject to certain restrictions and risk of forfeiture by the participants. A summary of changes in our nonvested shares for the year follows: (shares in thousands) Shares Weighted Average Grant-Date Fair Value Nonvested balance at January 1, 2016 840 $ 12.56 Granted during the year 279 10.17 Vested during the year (16 ) 13.04 Forfeited during the year (295 ) 11.84 Dividend equivalents adjustment 13 11.05 Nonvested balance at December 31, 2016 821 $ 12.02 As of December 31, 2016, there was $2.7 million of total unrecognized compensation cost related to nonvested shares granted under the ICP. The cost is expected to be recognized over a weighted-average period of 1.7 years. Stock Options Option awards are generally granted with an exercise price equal to the market price of our common stock at the date of grant; these option awards have vesting periods ranging from 3 to 5 years and have 10-year Old National has not granted stock options since 2009. However, Old National did acquire stock options through prior year acquisitions. Old National recorded no incremental expense associated with the conversion of these options. A summary of the activity in the stock option plan in 2016 follows: (shares in thousands) Shares Weighted Weighted Aggregate Outstanding at January 1, 2016 1,043 $ 16.16 Exercised (191 ) 12.83 Forfeited/expired (158 ) 24.09 Outstanding at December 31, 2015 694 $ 15.27 1.33 $ 2,460.1 Options exercisable at end of year 694 $ 15.27 1.33 $ 2,460.1 Information related to the stock option plan during each year follows: (dollars in thousands) 2016 2015 2014 Intrinsic value of options exercised $ 660 $ 458 $ 432 Cash received from option exercises 2,349 997 1,002 Tax benefit realized from option exercises 264 159 97 As of December 31, 2016, all options were fully vested and all compensation costs had been expensed. Stock Appreciation Rights Old National has never granted stock appreciation rights. However, Old National did acquire stock appreciation rights through a prior year acquisition. Old National recorded no incremental expense associated with the conversion of these stock appreciation rights. At December 31, 2016, 0.1 million stock appreciation rights remained outstanding. Outside Director Stock Compensation Program Old National maintains a director stock compensation program covering all outside directors. Compensation shares are earned semi-annually. Beginning in 2017, any shares awarded to directors should be issued from the Amended and Restated 2008 Incentive Compensation Plan. Approximately 35,000 shares will be issued to directors in 2017.

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2016
Equity [Abstract]
Shareholders' Equity	NOTE 20 – SHAREHOLDERS’ EQUITY Dividend Reinvestment and Stock Purchase Plan Old National has a dividend reinvestment and stock purchase plan under which common shares issued may be either repurchased shares or authorized and previously unissued shares. A new plan became effective on August 16, 2012, with total authorized and unissued common shares reserved for issuance of 3.3 million. At December 31, 2016, 3.3 million authorized and unissued common shares were available for issuance under the plan. Employee Stock Purchase Plan Old National has an employee stock purchase plan under which eligible employees can purchase common shares at a price not less than 95% of the fair market value of the common shares on the purchase date. The amount of common shares purchased cannot exceed ten percent of the employee’s compensation. The maximum number of shares that may be purchased under this plan is 500,000 shares. In 2016, 32,000 shares were issued related to this plan with proceeds of approximately $388,000. In 2015, 29,000 shares were issued related to this plan with proceeds of approximately $391,000.

Fair Value

Fair Value	12 Months Ended
	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Fair Value	NOTE 21 - FAIR VALUE FASB ASC 820-10 820-10 • 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 company’s own assumptions about the assumptions that market participants would use in pricing an asset or liability. Old National used the following methods and significant assumptions to estimate the fair value of each type of financial instrument: Investment securities Residential loans held for sale Derivative financial instruments Assets and liabilities measured at fair value on a recurring basis, including financial assets and liabilities for which we have elected the fair value option, are summarized below: Fair Value Measurements at December 31, 2016 Using (dollars in thousands) Carrying Quoted Prices in Significant Significant (Level 3) Financial Assets Trading securities $ 4,982 $ 4,982 $ — $ — Investment securities available-for-sale: U.S. Treasury 7,103 7,103 — — U.S. government-sponsored entities and agencies 493,956 — 493,956 — Mortgage-backed securities - Agency 1,525,019 — 1,525,019 — States and political subdivisions 436,684 — 436,684 Pooled trust preferred securities 8,119 — — 8,119 Other securities 326,293 30,905 295,388 — Residential loans held for sale 90,682 — 90,682 — Derivative assets 17,701 — 17,701 — Financial Liabilities Derivative liabilities 23,574 — 23,574 — Fair Value Measurements at December 31, 2015 Using (dollars in thousands) Carrying Quoted Prices in Significant Significant (Level 3) Financial Assets Trading securities $ 3,941 $ 3,941 $ — $ — Investment securities available-for-sale: U.S. Treasury 12,150 12,150 — — U.S. government-sponsored entities and agencies 613,550 — 613,550 — Mortgage-backed securities - Agency 1,066,361 — 1,066,361 — States and political subdivisions 387,296 — 387,296 — Pooled trust preferred securities 7,900 — — 7,900 Other securities 330,964 31,443 299,521 — Residential loans held for sale 13,810 — 13,810 — Derivative assets 15,925 — 15,925 — Financial Liabilities Derivative liabilities 26,968 — 26,968 — The table below presents a reconciliation of all assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the year ended December 31, 2016: (dollars in thousands) Pooled Trust Available-for-Sale Balance at January 1, 2016 $ 7,900 Accretion of discount 18 Sales/payments received (327 ) Increase in fair value of securities 528 Balance at December 31, 2016 $ 8,119 The accretion of discounts on securities totaling $18 thousand in 2016 is included in interest income. The increase in fair value is reflected in the balance sheet as an increase in the fair value of investment securities available-for-sale, The table below presents a reconciliation of all assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the year ended December 31, 2015: (dollars in thousands) Pooled Trust Available-for-Sale State and Balance at January 1, 2015 $ 6,607 $ 325 Accretion of discount 18 — Sales/payments received (663 ) — Matured securities — (325 ) Increase in fair value of securities 1,938 — Balance at December 31, 2015 $ 7,900 $ — The accretion of discounts on securities totaling $18 thousand in 2015 is included in interest income. The increase in fair value is reflected in the balance sheet as an increase in the fair value of investment securities available-for-sale, The tables below provide quantitative information about significant unobservable inputs used in fair value measurements within Level 3 of the fair value hierarchy: (dollars in thousands) Fair Value at Valuation Techniques Unobservable Input Range (Weighted Pooled trust preferred securities $ 8,119 Discounted cash flow Constant prepayment rate (a) 0.00% Additional asset defaults (b) 4.5% - 10.0% (7.9%) Expected asset recoveries (c) 0.0% - 6.1% (0.9%) (a) Assuming no prepayments. (b) Each currently performing pool asset is assigned a default probability based on the banking environment, which is adjusted for specific issuer evaluation, of 0%, 50% or 100%. (c) Each currently defaulted pool asset is assigned a recovery probability based on specific issuer evaluation of 0%, 25% or 100%. (dollars in thousands) Fair Value at Valuation Techniques Unobservable Input Range (Weighted Pooled trust preferred securities $ 7,900 Discounted cash flow Constant prepayment rate (a) 0.00% Additional asset defaults (b) 4.1% - 11.5% (8.1%) Expected asset recoveries (c) 0.0% - 11.5% (3.1%) (a) Assuming no prepayments. (b) Each currently performing pool asset is assigned a default probability based on the banking environment, which is adjusted for specific issuer evaluation, of 0%, 50%, or 100%. (c) Each currently defaulted pool asset is assigned a recovery probability based on specific issuer evaluation of 0%, 25%, or 100%. Significant changes in any of the unobservable inputs used in the fair value measurement in isolation would result in a significant change to the fair value measurement. The pooled trust preferred securities Old National owns are subordinate note classes that rely on an ongoing cash flow stream to support their values. The senior note classes receive the benefit of prepayments to the detriment of subordinate note classes since the ongoing interest cash flow stream is reduced by the early redemption. Generally, a change in prepayment rates or additional pool asset defaults has an impact that is directionally opposite from a change in the expected recovery of a defaulted pool asset. Assets measured at fair value on a non-recurring Fair Value Measurements at December 31, 2016 Using (dollars in thousands) Carrying Quoted Prices in Significant Significant (Level 3) Collateral Dependent Impaired Loans Commercial loans $ 6,771 $ — $ — $ 6,771 Commercial real estate loans 11,632 — — 11,632 Foreclosed Assets Commercial real estate 1,352 — — 1,352 Residential 394 — — 394 Impaired commercial and commercial real estate loans that are deemed collateral dependent are valued based on the fair value of the underlying collateral. These estimates are based on the most recently available appraisals with certain adjustments made based on the type of property, age of appraisal, current status of the property, and other related factors to estimate the current value of the collateral. These impaired commercial and commercial real estate loans had a principal amount of $26.4 million, with a valuation allowance of $8.0 million at December 31, 2016. Old National recorded provision recapture associated with these loans totaling $1.1 million in 2016. Other real estate owned and other repossessed property is measured at fair value less costs to sell and had a net carrying amount of $1.7 million at December 31, 2016. The estimates of fair value are based on the most recently available appraisals with certain adjustments made based on the type of property, age of appraisal, current status of the property, and other related factors to estimate the current value of the collateral. There were write-downs of other real estate owned of $3.0 million in 2016. Assets measured at fair value on a non-recurring Fair Value Measurements at December 31, 2015 Using (dollars in thousands) Carrying Quoted Prices in Significant Significant Collateral Dependent Impaired Loans Commercial loans $ 13,332 $ — $ — $ 13,332 Commercial real estate loans 11,857 — — 11,857 Foreclosed Assets Commercial real estate 2,526 — — 2,526 Residential 203 — — 203 As of December 31, 2015, impaired commercial and commercial real estate loans had a principal amount of $36.8 million, with a valuation allowance of $11.5 million. Old National recorded provision expense associated with these loans totaling $4.7 million in 2015. Other real estate owned and other repossessed property had a net carrying amount of $2.7 million at December 31, 2015. There were write-downs of other real estate owned of $2.2 million in 2015. The tables below provide quantitative information about significant unobservable inputs used in fair value measurements within Level 3 of the fair value hierarchy: (dollars in thousands) Fair Value at Valuation Unobservable Range (Weighted Collateral Dependent Impaired Loans Commercial loans $ 6,771 Fair value of Discount for type of property, age of appraisal and current status 0% - 99% (53%) Commercial real estate loans 11,632 Fair value of Discount for type of property, age of appraisal and current status 10% - 67% (36%) Foreclosed Assets Commercial real estate 1,352 Fair value of Discount for type of property, age of appraisal and current status 4% - 80% (39%) Residential 394 Fair value of Discount for type of property, age of appraisal and current status 7% - 60% (30%) (dollars in thousands) Fair Value at Valuation Unobservable Range (Weighted Collateral Dependent Impaired Loans Commercial loans $ 13,332 Fair value of Discount for type of property, age of appraisal, and current status 0% - 86% (28%) Commercial real estate loans 11,857 Fair value of Discount for type of property, age of appraisal, and current status 0% - 61% (33%) Foreclosed Assets Commercial real estate 2,526 Fair value of Discount for type of property, age of appraisal, and current status 3% - 80% (26%) Residential 203 Fair value of Discount for type of property, age of appraisal, and current status 7% - 53% (29%) Financial instruments recorded using fair value option Under FASB ASC 825-10, instrument-by We have elected the fair value option for residential loans held for sale. For these loans, interest income is recorded in the consolidated statements of income based on the contractual amount of interest income earned on the financial assets (except any that are on nonaccrual status). None of these loans are 90 days or more past due, nor are any on nonaccrual status. Included in the income statement is interest income for loans held for sale totaling $0.1 million in 2016 and 2015. Residential loans held for sale Old National has elected the fair value option for newly originated conforming fixed-rate and adjustable-rate first mortgage loans held for sale. These loans are intended for sale and are hedged with derivative instruments. Old National has elected the fair value option to mitigate accounting mismatches in cases where hedge accounting is complex and to achieve operational simplification. The fair value option was not elected for loans held for investment. The difference between the aggregate fair value and the aggregate remaining principal balance for loans for which the fair value option has been elected as of December 31, 2016 and 2015 was as follows: (dollars in thousands) Aggregate Difference Contractual 2016 Residential loans held for sale $ 90,682 $ 133 $ 90,549 2015 Residential loans held for sale $ 13,810 $ 236 $ 13,574 Accrued interest at period end is included in the fair value of the instruments. The following table presents the amount of gains and losses from fair value changes included in income before income taxes for financial assets carried at fair value for the years ended December 31: (dollars in thousands) Other Gains and (Losses) Interest Income Interest (Expense) Total Changes in Fair Values Included in Current Period Earnings 2016 Residential loans held for sale $ (103 ) $ — $ — $ (103 ) 2015 Residential loans held for sale $ (140 ) $ — $ — $ (140 ) The carrying amounts and estimated fair values of financial instruments, not previously presented in this note, at December 31, 2016 and 2015 were as follows: Fair Value Measurements at December 31, 2016 Using (dollars in thousands) Carrying 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, due from banks, federal funds sold, and money market investments $ 255,519 $ 255,519 $ — $ — Investment securities held-to-maturity: U.S. government-sponsored entities and agencies 40,131 — 40,558 — Mortgage-backed securities—Agency 10,640 — 10,940 — State and political subdivisions 694,319 — 732,674 — Federal Home Loan Bank/Federal Reserve Bank stock 101,716 N/A N/A N/A Loans, net: Commercial 1,895,618 — — 1,971,296 Commercial real estate 3,112,680 — — 3,400,365 Residential real estate 2,085,887 — — 2,228,542 Consumer credit 1,866,519 — — 1,974,180 Accrued interest receivable 81,381 16 22,880 58,485 Financial Liabilities Deposits: Noninterest-bearing demand deposits $ 3,016,093 $ 3,016,093 $ — $ — NOW, savings, and money market deposits 6,259,052 6,259,052 — — Time deposits 1,468,108 — 1,460,778 — Federal funds purchased and interbank borrowings 213,003 213,003 Securities sold under agreements to repurchase 367,052 317,052 50,612 — Federal Home Loan Bank advances 1,353,092 — — 1,360,599 Other borrowings 218,939 — 217,647 — Accrued interest payable 5,979 — 5,979 — Standby letters of credit 315 — — 315 Off-Balance Commitments to extend credit $ — $ — $ — $ 2,527 N/A = not applicable Carrying Fair Value Measurements at December 31, 2015 Using (dollars in thousands) Quoted Prices in Significant Significant (Level 3) Financial Assets Cash, due from banks, federal funds sold, and money market investments $ 219,818 $ 219,818 $ — $ — Investment securities held-to-maturity: U.S. government-sponsored entities and agencies 142,864 — 145,763 — Mortgage-backed securities - Agency 16,042 — 16,604 — State and political subdivisions 713,205 — 767,050 — Federal Home Loan Bank/Federal Reserve Bank stock 86,146 N/A N/A N/A Loans, net (including covered loans): Commercial 1,788,593 — — 1,829,824 Commercial real estate 1,852,979 — — 1,946,163 Residential real estate 1,659,284 — — 1,745,248 Consumer credit 1,595,316 — — 1,587,879 FDIC indemnification asset 9,030 — — 5,700 Accrued interest receivable 69,098 29 22,821 46,248 Financial Liabilities Deposits: Noninterest-bearing demand deposits $ 2,488,855 $ 2,488,855 $ — $ — NOW, savings, and money market deposits 4,911,938 4,911,938 — — Time deposits 1,000,067 — 998,878 — Federal funds purchased and interbank borrowings 291,090 291,090 — — Securities sold under agreements to repurchase 387,409 337,409 51,370 — Federal Home Loan Bank advances 1,023,491 — — 1,029,779 Other borrowings 218,256 — 201,138 — Accrued interest payable 4,859 — 4,859 — Standby letters of credit 429 — — 429 Off-Balance Commitments to extend credit $ — $ — $ — $ 2,364 N/A = not applicable The following methods and assumptions were used to estimate the fair value of each type of financial instrument. Cash, due from banks, federal funds sold, and money market investments: Investment securities: held-to-maturity Federal Home Loan Bank and Federal Reserve Bank stock: Loans Covered loans: FDIC indemnification asset: Accrued interest receivable and payable: Deposits Federal funds purchased and interbank borrowings Securities sold under agreements to repurchase Federal Home Loan Bank advances Other borrowings Standby letters of credit 460-10 Off-balance off-balance

Derivative Financial Instrument

Derivative Financial Instruments	12 Months Ended
	Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	NOTE 22 – DERIVATIVE FINANCIAL INSTRUMENTS As part of our overall interest rate risk management, Old National uses derivative instruments, including interest rate swaps, caps and floors. The notional amount of these derivative instruments was $660.0 million at December 31, 2016 and $761.5 million at December 31, 2015. The December 31, 2016 balances consist of $35.0 million notional amount of receive-fixed, pay-variable pay-fixed, pay-variable pay-fixed, pay-variable In addition, commitments to fund certain mortgage loans (interest rate lock commitments) and forward commitments for the future delivery of mortgage loans to third party investors are considered derivatives. At December 31, 2016, the notional amount of the interest rate lock commitments was $40.3 million and forward commitments were $86.1 million. At December 31, 2015, the notional amount of the interest rate lock commitments was $30.4 million and forward commitments were $33.3 million. It is our practice to enter into forward commitments for the future delivery of residential mortgage loans to third party investors when interest rate lock commitments are entered into in order to economically hedge the effect of changes in interest rates resulting from our commitment to fund the loans. Old National also enters into derivative instruments for the benefit of its customers. The notional amounts of these customer derivative instruments and the offsetting counterparty derivative instruments were $582.7 million at December 31, 2016. At December 31, 2015, the notional amounts of the customer derivative instruments and the offsetting counterparty derivative instruments were $428.4 million. These derivative contracts do not qualify for hedge accounting. These instruments include interest rate swaps, caps, collars, foreign exchange forward contracts, and commodity swaps and options. Credit risk arises from the possible inability of counterparties to meet the terms of their contracts. Old National’s exposure is limited to the replacement value of the contracts rather than the notional, principal or contract amounts. There are provisions in our agreements with the counterparties that allow for certain unsecured credit exposure up to an agreed threshold. Exposures in excess of the agreed thresholds are collateralized. In addition, we minimize credit risk through credit approvals, limits, and monitoring procedures. Amounts reported in AOCI related to cash flow hedges will be reclassified to interest income or interest expense as interest payments are received or paid on the Company’s derivative instruments. During the next 12 months, the Company estimates that $0.3 million will be reclassified to interest income and $6.1 million will be reclassified to interest expense. On the balance sheet, asset derivatives are included in other assets, and liability derivatives are included in other liabilities. The following table summarizes the fair value of derivative financial instruments utilized by Old National: December 31, 2016 December 31, 2015 (dollars in thousands) Asset Liability Asset Liability Derivatives Derivatives designated as hedging instruments Interest rate contracts $ 3,056 $ 11,582 $ 3,794 $ 15,554 Total derivatives designated as hedging instruments $ 3,056 $ 11,582 $ 3,794 $ 15,554 Derivatives not designated as hedging instruments Interest rate contracts $ 11,903 $ 11,992 $ 11,296 $ 11,414 Mortgage contracts 2,742 — 835 — Total derivatives not designated as hedging instruments $ 14,645 $ 11,992 $ 12,131 $ 11,414 Total $ 17,701 $ 23,574 $ 15,925 $ 26,968 The effect of derivative instruments on the consolidated statements of income for the years ended December 31 were as follows: (dollars in thousands) 2016 2015 2014 Derivatives in Fair Value Hedging Relationships Location of Gain or (Loss) Recognized in Income on Derivative Amount of Gain or (Loss) Interest rate contracts (1) Interest income / (expense) $ (5,446 ) $ (1,729 ) $ 1,002 Interest rate contracts (2) Other income / (expense) 126 189 275 Total $ (5,320 ) $ (1,540 ) $ 1,277 Derivatives in Cash Flow Hedging Relationships Location of Gain or (Loss) Recognized in Income on Derivative Amount of Gain or (Loss) Interest rate contracts (1) Interest income / (expense) $ 329 $ 511 $ 246 Total $ 329 $ 511 $ 246 Derivatives Not Designated as Hedging Instruments Location of Gain or (Loss) Recognized in Income on Derivative Amount of Gain or (Loss) Interest rate contracts (3) Other income / (expense) $ 28 $ 18 $ 88 Mortgage contracts Mortgage banking revenue 1,390 168 252 Total $ 1,418 $ 186 $ 340 (1) Amounts represent the net interest payments as stated in the contractual agreements. (2) Amounts represent ineffectiveness on derivatives designated as fair value hedges. (3) Includes the valuation differences between the customer and offsetting counterparty swaps.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	NOTE 23 - COMMITMENTS AND CONTINGENCIES Litigation In the normal course of business, Old National Bancorp and its subsidiaries have been named, from time to time, as defendants in various legal actions. Certain of the actual or threatened legal actions may include claims for substantial compensatory and/or punitive damages or claims for indeterminate amounts of damages. Old National contests liability and/or the amount of damages as appropriate in each pending matter. In view of the inherent difficulty of predicting the outcome of such matters, particularly in cases where claimants seek substantial or indeterminate damages or where investigations and proceedings are in the early stages, Old National cannot predict with certainty the loss or range of loss, if any, related to such matters, how or if such matters will be resolved, when they will ultimately be resolved, or what the eventual settlement, or other relief, if any, might be. Subject to the foregoing, Old National believes, based on current knowledge and after consultation with counsel, that the outcome of such pending matters will not have a material adverse effect on the consolidated financial condition of Old National, although the outcome of such matters could be material to Old National’s operating results and cash flows for a particular future period, depending on, among other things, the level of Old National’s revenues or income for such period. Old National will accrue for a loss contingency if (1) it is probable that a future event will occur and confirm the loss and (2) the amount of the loss can be reasonably estimated. Old National is not currently involved in any material litigation. Credit-Related Financial Instruments In the normal course of business, Old National’s banking affiliates have entered into various agreements to extend credit, including loan commitments of $2.354 billion and standby letters of credit of $51.7 million at December 31, 2016. At December 31, 2016, approximately $2.207 billion of the loan commitments had fixed rates and $146.5 million had floating rates, with the floating interest rates ranging from 0% to 25%. At December 31, 2015, loan commitments totaled $1.746 billion and standby letters of credit totaled $62.6 million. These commitments are not reflected in the consolidated financial statements. The allowance for unfunded loan commitments totaled $3.2 million at December 31, 2016 and $3.6 million at December 31, 2015. Old National had credit extensions with various unaffiliated banks related to letter of credit commitments issued on behalf of Old National’s clients totaling $13.3 million at December 31, 2016 and $14.5 million at December 31, 2015. Old National provided collateral to the unaffiliated banks to secure credit extensions totaling $12.6 million at December 31, 2016 and $13.6 million December 31, 2015. Old National did not provide collateral for the remaining credit extensions.

Financial Guarantees

Financial Guarantees	12 Months Ended
	Dec. 31, 2016
Guarantees [Abstract]
Financial Guarantees	NOTE 24 – FINANCIAL GUARANTEES Old National holds instruments, in the normal course of business with clients, that are considered financial guarantees in accordance with FASB ASC 460-10 Guarantor’s Accounting and Disclosure Requirements for Guarantees, Including Indirect Guarantees of Indebtedness of Others , Old National entered into a risk participation in an interest rate swap during the second quarter of 2007, which had a notional amount of $6.8 million at December 31, 2016. Old National entered into an additional risk participation in an interest rate swap during the third quarter of 2014, which had a notional amount of $9.9 million at December 31, 2016.

Regulatory Restrictions

Regulatory Restrictions	12 Months Ended
	Dec. 31, 2016
Text Block [Abstract]
Regulatory Restrictions	NOTE 25 - REGULATORY RESTRICTIONS Restrictions on Cash and Due from Banks Old National’s affiliate bank is required to maintain reserve balances on hand and with the Federal Reserve Bank which are interest bearing and unavailable for investment purposes. The reserve balances were $85.4 million at December 31, 2016 and $68.4 million at December 31, 2015. In addition, Old National had cash and due from banks which was held as collateral for collateralized swap positions of $3.5 million at December 31, 2016 and $0.2 million at December 31, 2015. Restrictions on Transfers from Affiliate Bank Regulations limit the amount of dividends an affiliate bank can declare in any year without obtaining prior regulatory approval. Prior regulatory approval is required if dividends to be declared in any year would exceed net earnings of the current year plus retained net profits for the preceding two years. Prior regulatory approval to pay dividends was not required in 2014, 2015, or 2016 and is not currently required. Restrictions on the Payment of Dividends Old National has traditionally paid a quarterly dividend to common stockholders. The payment of dividends is subject to legal and regulatory restrictions. Any payment of dividends in the future will depend, in large part, on Old National’s earnings, capital requirements, financial condition, and other factors considered relevant by our Board of Directors. Capital Adequacy Old National and Old National Bank are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can elicit certain mandatory actions by regulators that, if undertaken, could have a direct material effect on Old National’s financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, Old National and Old National Bank must meet specific capital guidelines that involve quantitative measures of assets, liabilities, and certain off-balance At December 31, 2016, Old National and Old National Bank exceeded the regulatory minimums and Old National Bank met the regulatory definition of well-capitalized based on the most recent regulatory notification. The following table summarizes capital ratios for Old National and Old National Bank as of December 31: Fully Phased-In Regulatory Well Capitalized Actual Guidelines Minimum (1) Guidelines (dollars in thousands) Amount Ratio Amount Ratio Amount Ratio 2016 Total capital to risk- weighted assets Old National Bancorp $ 1,229,878 12.18 % $ 1,060,662 10.50 % $ N/A N/A % Old National Bank 1,240,180 12.35 1,054,305 10.50 1,004,100 10.00 Common equity Tier 1 capital to risk-weighted assets Old National Bancorp 1,162,817 11.51 707,108 7.00 N/A N/A Old National Bank 1,187,151 11.82 702,870 7.00 652,665 6.50 Tier 1 capital to risk- weighted assets Old National Bancorp 1,176,849 11.65 858,631 8.50 N/A N/A Old National Bank 1,187,151 11.82 853,485 8.50 803,280 8.00 Tier 1 capital to average assets Old National Bancorp 1,176,849 8.43 558,673 4.00 N/A N/A Old National Bank 1,187,151 8.55 555,161 4.00 693,951 5.00 2015 Total capital to risk- weighted assets Old National Bancorp $ 1,024,586 13.28 % $ 810,397 10.50 % $ N/A N/A % Old National Bank 1,079,652 14.11 803,490 10.50 765,229 10.00 Common equity Tier 1 capital to risk-weighted assets Old National Bancorp 934,497 12.11 540,265 7.00 N/A N/A Old National Bank 1,023,839 13.38 535,660 7.00 497,399 6.50 Tier 1 capital to risk- weighted assets Old National Bancorp 968,772 12.55 656,036 8.50 N/A N/A Old National Bank 1,023,839 13.38 650,445 8.50 612,183 8.00 Tier 1 capital to average assets Old National Bancorp 968,772 8.54 454,005 4.00 N/A N/A Old National Bank 1,023,839 9.11 449,791 4.00 562,239 5.00 N/A = not applicable (1) When fully phased-in

Parent Company Financial Statem

Parent Company Financial Statements	12 Months Ended
	Dec. 31, 2016
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Parent Company Financial Statements	NOTE 26 - PARENT COMPANY FINANCIAL STATEMENTS The following are the condensed parent company only financial statements of Old National: OLD NATIONAL BANCORP (PARENT COMPANY ONLY) CONDENSED BALANCE SHEETS December 31, (dollars in thousands) 2016 2015 Assets Deposits in affiliate bank $ 91,650 $ 48,000 Trading securities - at fair value 4,982 3,941 Investment securities - available-for-sale 1,535 1,452 Investment in affiliates: Banking subsidiaries 1,862,244 1,551,924 Non-banks 11,388 49,083 Other assets 90,872 84,598 Total assets $ 2,062,671 $ 1,738,998 Liabilities and Shareholders’ Equity Other liabilities $ 33,407 $ 33,608 Other borrowings 214,847 214,220 Shareholders’ equity 1,814,417 1,491,170 Total liabilities and shareholders’ equity $ 2,062,671 $ 1,738,998 OLD NATIONAL BANCORP (PARENT COMPANY ONLY) CONDENSED STATEMENTS OF INCOME Years Ended December 31, (dollars in thousands) 2016 2015 2014 Income Dividends from affiliates $ 160,007 $ 67,717 $ 65,292 Net securities gains 100 6 170 Other income 40,841 1,892 1,554 Other income from affiliates 6 51 79 Total income 200,954 69,666 67,095 Expense Interest on borrowings 9,077 8,684 3,837 Other expenses 18,460 13,957 11,357 Total expense 27,537 22,641 15,194 Income before income taxes and equity in undistributed earnings of affiliates 173,417 47,025 51,901 Income tax expense (benefit) 11,952 (5,473 ) (4,020 ) Income before equity in undistributed earnings of affiliates 161,465 52,498 55,921 Equity in undistributed earnings of affiliates (27,201 ) 64,218 47,746 Net income $ 134,264 $ 116,716 $ 103,667 OLD NATIONAL BANCORP (PARENT COMPANY ONLY) CONDENSED STATEMENT OF CASH FLOWS Years Ended December 31, (dollars in thousands) 2016 2015 2014 Cash Flows From Operating Activities Net income $ 134,264 $ 116,716 $ 103,667 Adjustments to reconcile net income to cash provided by operating activities: Depreciation 29 20 11 Net securities gains (100 ) (6 ) (270 ) Gain on sale of ONB Insurance Group, Inc. (41,864 ) — — Stock compensation expense 7,318 4,255 4,162 (Increase) decrease in other assets (3,958 ) 6,307 20,040 Increase (decrease) in other liabilities (225 ) 1,441 286 Equity in undistributed earnings of affiliates 27,201 (64,218 ) (47,746 ) Total adjustments (11,599 ) (52,201 ) (23,517 ) Net cash flows provided by operating activities 122,665 64,515 80,150 Cash Flows From Investing Activities Net cash and cash equivalents of acquisitions (100,220 ) (41,070 ) (82,975 ) Proceeds from sale of ONB Insurance Group, Inc. 91,771 — — Purchases of investment securities (52 ) (1,053 ) (45 ) Net advances to affiliates (3,500 ) — (3,832 ) Purchases of premises and equipment (13 ) — (1,032 ) Net cash flows used in investing activities (12,014 ) (42,123 ) (87,884 ) Cash Flows From Financing Activities Proceeds from issuance of other borrowings — — 173,500 Cash dividends paid on common stock (67,536 ) (55,552 ) (48,181 ) Common stock repurchased (2,202 ) (88,695 ) (25,830 ) Proceeds from exercise of stock options, including tax benefit 2,349 997 749 Common stock issued 388 391 326 Net cash flows provided by (used in) financing activities (67,001 ) (142,859 ) 100,564 Net increase (decrease) in cash and cash equivalents 43,650 (120,467 ) 92,830 Cash and cash equivalents at beginning of period 48,000 168,467 75,637 Cash and cash equivalents at end of period $ 91,650 $ 48,000 $ 168,467

Segment Information

Segment Information	12 Months Ended
	Dec. 31, 2016
Segment Reporting [Abstract]
Segment Information	NOTE 27 – SEGMENT INFORMATION During the second quarter of 2016, Old National sold its insurance operations, ONB Insurance Group, Inc. During the year ended December 31, 2015, the insurance segment’s net income was $2.1 million and its assets totaled $61.8 million at December 31, 2015. In conjunction with the divestiture, Old National re-evaluated Operating segments are components of an enterprise about which separate financial information is available that is evaluated regularly by the chief operating decision maker in deciding how to allocate resources and in assessing performance. Old National Bank, Old National’s bank subsidiary, is the only significant subsidiary upon which management makes decisions regarding how to allocate resources and assess performance. Each of the branches of Old National Bank provide a group of similar community banking services, including such products and services as commercial, real estate and consumer loans, time deposits, checking and savings accounts, cash management, brokerage, trust, and investment advisory services. The individual bank branches located throughout our Midwest footprint have similar operating and economic characteristics. While the chief decision maker monitors the revenue streams of the various products, services, and regional locations, operations are managed and financial performance is evaluated on a Company-wide basis. Accordingly, all of the community banking services and branch locations are considered by management to be aggregated into one reportable operating segment, community banking.

Interim Financial Data (Unaudit

Interim Financial Data (Unaudited)	12 Months Ended
	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Interim Financial Data (Unaudited)	NOTE 28 – INTERIM FINANCIAL DATA (UNAUDITED) The following table details the quarterly results of operations for the years ended December 31, 2016 and 2015. (unaudited, dollars Three Months Ended Three Months Ended 12/31/2016 9/30/2016 6/30/2016 3/31/2016 12/31/2015 9/30/2015 6/30/2015 3/31/2015 Interest income $ 121,849 $ 119,713 $ 110,243 $ 95,329 $ 94,960 $ 105,671 $ 99,964 $ 98,594 Interest expense 11,932 11,910 10,903 9,686 9,038 8,567 7,867 7,601 Net interest income 109,917 107,803 99,340 85,643 85,922 97,104 92,097 90,993 Provision for loan losses (1,756 ) 1,306 1,319 91 484 167 2,271 1 Noninterest income 62,751 47,243 93,385 49,451 60,614 59,744 54,979 55,295 Noninterest expense 126,258 108,062 121,472 98,355 102,469 102,617 109,690 116,156 Income before income taxes 48,166 45,678 69,934 36,648 43,583 54,064 35,115 30,131 Income tax expense 14,710 10,969 30,812 9,671 11,598 16,395 8,959 9,225 Net income $ 33,456 $ 34,709 $ 39,122 $ 26,977 $ 31,985 $ 37,669 $ 26,156 $ 20,906 Net income per share: Basic $ 0.25 $ 0.25 $ 0.31 $ 0.24 $ 0.28 $ 0.33 $ 0.22 $ 0.18 Diluted 0.25 0.25 0.31 0.24 0.27 0.33 0.22 0.18 Average shares: Basic 134,670 134,492 127,508 113,998 114,103 114,590 115,732 118,540 Diluted 135,383 135,011 127,973 114,563 114,716 115,153 116,223 119,076 Quarterly results, most notably interest income, noninterest income and noninterest expense, were impacted by the acquisition of Anchor in May 2016. In addition, the Company sold its insurance operations, ONB Insurance Group, Inc. on May 31, 2016.

Basis of Presentation and Sig37

Basis of Presentation and Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2016
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying consolidated financial statements include the accounts of Old National Bancorp and its wholly-owned affiliates (hereinafter collectively referred to as “Old National”) and have been prepared in conformity with accounting principles generally accepted in the United States and prevailing practices within the banking industry. Such principles require management to make estimates and assumptions that affect the reported amounts of assets, liabilities, and the disclosures of contingent assets and liabilities at the date of the financial statements and amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. All significant intercompany transactions and balances have been eliminated. Certain prior year amounts have been reclassified to conform to the 2016 presentation. Such reclassifications had no effect on net income or shareholders’ equity and were insignificant amounts.
Trading Securities	Trading Securities Trading securities consist of mutual funds held in trusts associated with deferred compensation plans for former directors and executives. These mutual funds are recorded as trading securities at fair value. Gains and losses are included in net securities gains.
Investment Securities	Investment Securities Old National classifies investment securities as available-for-sale or held-to-maturity on the date of purchase. Securities classified as available-for-sale are recorded at fair value with the unrealized gains and losses, net of tax effect, recorded in other comprehensive income. Realized gains and losses affect income and the prior fair value adjustments are reclassified within shareholders’ equity. Securities classified as held-to-maturity, which management has the intent and ability to hold to maturity, are reported at amortized cost. Premiums and discounts are amortized on the level-yield method. Anticipated prepayments are considered when amortizing premiums and discounts on mortgage backed securities. Gains and losses on the sale of available-for-sale securities are determined using the specific-identification method. Other-Than-Temporary Impairment
Federal Home Loan Bank (FHLB) Stock	Federal Home Loan Bank (“FHLB”) Stock Old National is a member of the FHLB system. Members are required to own a certain amount of stock based on the level of borrowings and other factors and may invest in additional amounts. FHLB stock is carried at cost, classified as a restricted security and periodically evaluated for impairment based on ultimate recovery of par value. Both cash and stock dividends are reported as income.
Loans Held for Sale	Loans Held for Sale Loans that Old National has originated with a commitment to sell are classified as loans held for sale and are recorded in accordance with FASB ASC 825-10 (SFAS No. 159) at fair value, determined individually, as of the balance sheet date. The loan’s fair value includes the servicing value of the loans as well as any accrued interest.
Loans	Loans Loans that Old National intends to hold for investment purposes are classified as portfolio loans. Portfolio loans are carried at the principal balance outstanding, net of earned interest, purchase premiums or discounts, deferred loan fees and costs, and an allowance for loan losses. Interest income is accrued on the principal balances of loans outstanding. For all loan classes, a loan is generally placed on nonaccrual status when principal or interest becomes 90 days past due unless it is well secured and in the process of collection, or earlier when concern exists as to the ultimate collectibility of principal or interest. Interest accrued during the current year on such loans is reversed against earnings. Interest accrued in the prior year, if any, is charged to the allowance for loan losses. Cash interest received on these loans is applied to the principal balance until the principal is recovered or until the loan returns to accrual status. Loans may be returned to accrual status when all the principal and interest amounts contractually due are brought current, remain current for a prescribed period, and future payments are reasonably assured. Purchased loans acquired in a business combination are recorded at estimated fair value on their purchase date with no carryover of the related allowance for loan and lease losses. In determining the estimated fair value of purchased loans, management considers a number of factors including, among others, the remaining life of the acquired loans, estimated prepayments, estimated loss ratios, estimated value of the underlying collateral, and net present value of cash flows expected to be received. Purchased loans are accounted for in accordance with guidance for certain loans acquired in a transfer (ASC 310-30), when the loans have evidence of credit deterioration since origination and it is probable at the date of acquisition that the acquirer will not collect all contractually required principal and interest payments. The difference between contractually required payments and the cash flows expected to be collected at acquisition is referred to as the non-accretable difference. Subsequent decreases to the expected cash flows will generally result in a provision for loan and lease losses. Subsequent increases in expected cash flows will result in a reversal of the provision for loan losses to the extent of prior charges and then an adjustment to accretable yield, which would have a positive impact on interest income.
Allowance for Loan Losses	Allowance for Loan Losses The allowance for loan losses is maintained at a level believed adequate by management to absorb probable losses incurred in the consolidated loan portfolio. Management’s evaluation of the adequacy of the allowance is an estimate based on reviews of individual loans, pools of homogeneous loans, assessments of the impact of current and anticipated economic conditions on the portfolio, and historical loss experience. The allowance is increased through a provision charged to operating expense. Loans deemed to be uncollectible are charged to the allowance. Recoveries of loans previously charged-off are added to the allowance. For all loan classes, a loan is considered impaired when it is probable that contractual interest and principal payments will not be collected either for the amounts or by the dates as scheduled in the loan agreement. If a loan is impaired, a portion of the allowance is allocated so that the loan is reported net, at the present value of estimated cash flows using the loan’s existing rate or at the fair value of collateral if repayment is expected solely from the collateral. Old National’s policy, for all but purchased credit impaired loans, is to recognize interest income on impaired loans unless the loan is placed on nonaccrual status. Acquired loans accounted for under ASC Topic 310-30 accrue interest, even though they may be contractually past due, as any nonpayment of contractual principal or interest is considered in the periodic re-estimation of expected cash flows and is included in the resulting recognition of current period loan loss provision or prospective yield adjustments. Old National charges off small commercial loans scored through our small business credit center with contractual balances under $250,000 that have been placed on nonaccrual status or became 90 days or more delinquent, without regard to the collateral position. For all portfolio segments, the general component covers non-impaired loans and is based on historical loss experience adjusted for current factors. This actual loss experience is supplemented with other economic factors based on the risks present for each portfolio segment. These economic factors include consideration of the following: levels of and trends in delinquencies and impaired loans; levels of and trends in charge-offs and recoveries; trends in volume and terms of loans; effects of any changes in risk selection and underwriting standards; other changes in lending policies, procedures, and practices; experience, ability, and depth of lending management and other relevant staff; national and local economic trends and conditions; industry conditions; and effects of changes in credit concentrations. Further information regarding Old National’s policies and methodology used to estimate the allowance for loan losses is presented in Note 6.
Premises and Equipment	Premises and Equipment Premises and equipment are stated at cost less accumulated depreciation. Land is stated at cost. Depreciation is charged to operating expense over the useful lives of the assets, principally on the straight-line method. Useful lives for premises and equipment are as follows: buildings and building improvements – 15 to 39 years; and furniture and equipment – 3 to 10 years. Leasehold improvements are depreciated over the lesser of their useful lives or the term of the lease. Maintenance and repairs are expensed as incurred while major additions and improvements are capitalized. Interest costs on construction of qualifying assets are capitalized. Premises and equipment are reviewed for impairment when events indicate their carrying amount may not be recoverable from future undiscounted cash flows. If impaired, the assets are adjusted to fair value. Such impairments are included in other expense.
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets The excess of the cost of acquired entities over the fair value of identifiable assets acquired less liabilities assumed is recorded as goodwill. In accordance with FASB ASC 350 (SFAS No. 142, Goodwill and Other Intangible Assets
Company-Owned Life Insurance	Company-Owned Life Insurance Old National has purchased life insurance policies on certain key executives. Old National records company-owned life insurance at the amount that can be realized under the insurance contract at the balance sheet date, which is the cash surrender value adjusted for other charges or other amounts due that are probable at settlement. Company-owned life insurance totaled $353.0 million at December 31, 2016 and $341.3 million at December 31, 2015.
Loan Servicing Rights	Loan Servicing Rights When loans are sold with servicing retained, servicing rights are initially recorded at fair value with the income statement effect recorded in gain on sales of loans. Fair value is based on market prices for comparable servicing contracts, when available or alternatively, is based on a valuation model that calculates the present value of estimated future net servicing income. All classes of servicing assets are subsequently measured using the amortization method which requires servicing rights to be amortized into noninterest income in proportion to, and over the period of, the estimated future net servicing income of the underlying loans. Loan servicing rights are evaluated for impairment based upon the fair value of the rights as compared to carrying amount. Impairment is determined by stratifying rights into groupings based on predominant risk characteristics, such as interest rate, loan type, term, and investor type. Impairment is recognized through a valuation allowance for an individual grouping, to the extent that fair value is less than the carrying amount. If the Company later determines that all or a portion of the impairment no longer exists for a particular grouping, a reduction of the allowance may be recorded as an increase to income. Changes in valuation allowances are reported with mortgage banking revenue on the income statement. The fair values of servicing rights are subject to significant fluctuations as a result of changes in estimated and actual prepayment speeds and default rates and losses. Servicing fee income, which is reported on the income statement as mortgage banking revenue, is recorded for fees earned for servicing loans. The fees are based on a contractual percentage of the outstanding principal, or a fixed amount per loan and are recorded as income when earned.
Derivative Financial Instruments	Derivative Financial Instruments As part of Old National’s overall interest rate risk management, Old National uses derivative instruments, including To Be Announced (“TBA”) forward agreements and interest rate swaps, caps, and floors. All derivative instruments are recognized on the balance sheet at their fair value in accordance with ASC 815, as amended. At the inception of the derivative contract, Old National will designate the derivative as (1) a hedge of the fair value of a recognized asset or liability or of an unrecognized firm commitment (“fair value hedge”), (2) a hedge of a forecasted transaction or of the variability of cash flows to be received or paid related to a recognized asset or liability (“cash flow hedge”), or (3) an instrument with no hedging designation (“stand-alone derivative”). For derivatives that are designated and qualify as a fair value hedge, the change in value of the derivative, as well as the offsetting change in value of the hedged item attributable to the hedged risk, are recognized in current earnings during the period of the change in fair values. For derivatives that are designated and qualify as a cash flow hedge, the effective portion of the change in value on the derivative is reported as a component of other comprehensive income and reclassified into earnings in the same period or periods during which the hedged transaction affects earnings. For all hedging relationships, changes in fair value of derivatives that are not effective in hedging the changes in fair value or expected cash flows of the hedged item are recognized immediately in current earnings during the period of the change. Similarly, the changes in the fair value of derivatives that do not qualify for hedge accounting under ASC Topic 815 are also reported currently in earnings, in noninterest income. The accrued net settlements on derivatives that qualify for hedge accounting are recorded in interest income or interest expense, consistent with the item being hedged. Old National formally documents all relationships between hedging instruments and hedged items, as well as its risk-management objective and strategy for undertaking various hedge transactions. This process includes linking all derivative instruments that are designated as fair-value or cash-flow hedges to specific assets and liabilities on the balance sheet or to specific firm commitments or forecasted transactions. Old National also formally assesses, both at the hedge’s inception and on an ongoing basis, whether the derivative instruments that are used in hedging transactions are highly effective in offsetting changes in fair values or cash flows of hedged items. Old National discontinues hedge accounting prospectively when it is determined that (1) the derivative is no longer effective in offsetting changes in the fair value or cash flows of the hedged item; (2) the derivative expires, is sold, or terminated; (3) the derivative instrument is de-designated When hedge accounting is discontinued, the future changes in fair value of the derivative are recorded as noninterest income. When a fair value hedge is discontinued, the hedged asset or liability is no longer adjusted for changes in fair value and the existing basis adjustment is amortized or accreted over the remaining life of the asset or liability. When a cash flow hedge is discontinued but the hedged cash flows or forecasted transaction is still expected to occur, changes in value that were accumulated in other comprehensive income are amortized or accreted into earnings over the same periods which the hedged transactions will affect earnings. Old National enters into various stand-alone mortgage-banking derivatives in order to hedge the risk associated with the fluctuation of interest rates. Changes in fair value are recorded as mortgage banking revenue. Old National also enters into various stand-alone derivative contracts to provide derivative products to customers which are carried at fair value with changes in fair value recorded as other noninterest income. Old National is exposed to losses if a counterparty fails to make its payments under a contract in which Old National is in the net receiving position. Old National anticipates that the counterparties will be able to fully satisfy their obligations under the agreements. In addition, Old National obtains collateral above certain thresholds of the fair value of its hedges for each counterparty based upon their credit standing. All of the contracts to which Old National is a party settle monthly, quarterly, or semiannually. Further, Old National has netting agreements with the dealers with which it does business.
Credit-Related Financial Instruments	Credit-Related Financial Instruments In the ordinary course of business, Old National’s affiliate bank has entered into credit-related financial instruments consisting of commitments to extend credit, commercial letters of credit, and standby letters of credit. The notional amount of these commitments is not reflected in the consolidated financial statements until they are funded.
Foreclosed Assets	Foreclosed Assets Other assets include real estate properties acquired as a result of foreclosure and repossessed personal property and are initially recorded at the fair value of the property less estimated cost to sell. Any excess recorded investment over the fair value of the property received is charged to the allowance for loan losses. Any subsequent write-downs are charged to expense, as are the costs of operating the properties. Foreclosed assets totaled $18.5 million at December 31, 2016 and $12.5 million at December 31, 2015.
Securities Purchased under Agreements to Resell and Securities Sold under Agreements to Repurchase	Securities Purchased Under Agreements to Resell and Securities Sold Under Agreements to Repuchase We purchase certain securities, generally U.S. government-sponsored entity and agency securities, under agreements to resell. The amounts advanced under these agreements represent short-term secured loans and are reflected as assets in the accompanying consolidated balance sheets. We also sell certain securities under agreements to repurchase. These agreements are treated as collateralized financing transactions. These secured borrowings are reflected as liabilities in the accompanying consolidated balance sheets and are recorded at the amount of cash received in connection with the transaction. Short-term securities sold under agreements to repurchase generally mature within one to four days from the transaction date. Securities, generally U.S. government and federal agency securities, pledged as collateral under these financing arrangements can be repledged by the secured party. Additional collateral may be required based on the fair value of the underlying securities.
Covered Assets, Loss Share Agreements, and Indemnification Asset	Covered Assets, Loss Share Agreements, and Indemnification Asset On July 29, 2011, Old National acquired the banking operations of Integra in an FDIC assisted transaction. As part of the purchase and assumption agreement, Old National and the FDIC entered into loss sharing agreements (each, a “loss sharing agreement” and collectively, the “loss sharing agreements”), whereby the FDIC would cover a substantial portion of any future losses on loans (and related unfunded commitments), OREO and up to 90 days of certain accrued interest on loans. The acquired loans and OREO subject to the loss sharing agreements are referred to collectively as “covered assets.” Old National entered into an agreement with the FDIC on June 22, 2016 to terminate its loss share agreements. As a result of the termination of the loss share agreements, the remaining covered assets that were covered by the loss share arrangements were reclassified to noncovered assets effective June 22, 2016. Prior to the termination of the loss share agreements, the FDIC would have reimbursed us for 80% of expenses and valuation write-downs related to covered assets up to $275.0 million, an amount which we never reached. Loans were recorded at fair value in accordance with ASC Topic 805, Business Combinations. No allowance for loan losses related to the acquired loans was recorded on the acquisition date as the fair value of the loans acquired incorporated assumptions regarding credit risk. Loans acquired are recorded at fair value in accordance with the fair value methodology prescribed in ASC Topic 820, exclusive of the loss share agreements with the FDIC. These loans were aggregated into pools of loans based on common risk characteristics such as credit score, loan type, and date of origination. The fair value estimates associated with these pools of loans included estimates related to expected prepayments and the amount and timing of undiscounted expected principal, interest, and other cash flows. Because the FDIC would have reimbursed us for losses incurred on certain acquired loans, an indemnification asset (FDIC loss share receivable) was recorded at fair value at the acquisition date. The indemnification asset was recognized at the same time as the indemnified loans, and measured on the same basis, subject to collectibility or contractual limitations. The loss share agreements on the acquisition date reflected the reimbursements expected to be received from the FDIC, using an appropriate discount rate, which reflected counterparty credit risk and other uncertainties.
Net Income per Share	Net Income per Share Basic net income per share is computed by dividing net income by the weighted-average number of common shares outstanding during each year. Diluted net income per share is computed as above and assumes the conversion of outstanding stock options and restricted stock. The following table reconciles basic and diluted net income per share for the years ended December 31. (dollars and shares in thousands, Years Ended December 31, except per share data) 2016 2015 2014 Basic Earnings Per Share Net income $ 134,264 $ 116,716 $ 103,667 Weighted average common shares outstanding 127,705 115,726 107,818 Basic Earnings Per Share $ 1.05 $ 1.01 $ 0.96 Diluted Earnings Per Share Net income $ 134,264 $ 116,716 $ 103,667 Weighted average common shares outstanding 127,705 115,726 107,818 Effect of dilutive securities: Restricted stock (1) 543 440 488 Stock options (2) 53 89 59 Weighted average shares outstanding 128,301 116,255 108,365 Diluted Earnings Per Share $ 1.05 $ 1.00 $ 0.95 (1) 3 thousand shares of restricted stock were not included in the computation of net income per diluted share at December 31, 2016 because the effect would be antidilutive. There were no shares excluded at December 31, 2015 or 2014 because the effect would be antidilutive. (2) Options to purchase 0.5 million shares, 0.7 million shares, and 1.0 million shares outstanding at December 31, 2016, 2015, and 2014, respectively, were not included in the computation of net income per diluted share because the exercise price of these options was greater than the average market price of the common shares and, therefore, the effect would be antidilutive.
Stock-Based Compensation	Stock-Based Compensation Compensation cost is recognized for stock options and restricted stock awards and units issued to employees based on the fair value of these awards at the date of grant. A Black-Scholes model is utilized to estimate the fair value of stock options, while the market price of our common stock at the date of grant is used for restricted stock awards. A third party provider is used to value certain restricted stock units where the performance measure is based on total shareholder return. Compensation expense is recognized over the requisite service period.
Income Taxes	Income Taxes Income tax expense is the total of the current year income tax due or refundable and the change in deferred tax assets and liabilities. Deferred tax assets and liabilities are the expected future tax amounts for the temporary differences between carrying amounts and tax bases of assets and liabilities, computed using enacted tax rates. A valuation allowance, if needed, reduces deferred tax assets to the amount expected to be realized. We recognize a tax position as a benefit only if it is “more likely than not” that the tax position would be sustained in a tax examination, with a tax examination being presumed to occur. The amount recognized is the largest amount of tax benefit that is greater than 50% likely of being realized on examination. For tax positions not meeting the “more likely than not” test, no tax benefit is recorded. We recognize interest and/or penalties related to income tax matters in income tax expense.
Loss Contingencies	Loss Contingencies Loss contingencies, including claims and legal actions arising in the normal course of business, are recorded as liabilities when the likelihood of loss is probable and an amount or range of loss can be reasonably estimated. See Note 23 to the consolidated financial statements for further disclosure.
Statement of Cash Flows Data	Statement of Cash Flows Data For the purpose of presentation in the accompanying consolidated statement of cash flows, cash and cash equivalents are defined as cash, due from banks, federal funds sold and resell agreements, and money market investments, which have maturities less than 90 days. The following table summarizes the supplemental cash flow information for the years ended December 31: Years Ended December 31, (dollars in thousands) 2016 2015 2014 Cash payments: Interest $ 43,698 $ 32,712 $ 21,005 Income taxes (net of refunds) 23,636 14,824 18,820 Noncash Investing and Financing Activities: Transfer of loans held for investment to loans held for sale — — 197,928 Transfer of premises and equipment to assets held for sale 4,620 9,070 3,042
Impact of Accounting Changes	Impact of Accounting Changes FASB ASC 606 – No. 2014-09, In March 2016, the FASB issued ASU No. 2016-08, No. 2014-09 No. 2014-09. In April 2016, the FASB issued ASU No. 2016-10, No. 2014-09 No. 2014-09. In May 2016, the FASB issued ASU No. 2016-12, In December 2016, the FASB issued ASU No. 2016-20, No. 2014-09 No. 2014-09. No. 2014-09. FASB ASC 718 – No. 2014-12, In March 2016, the FASB issued ASU No. 2016-09, FASB ASC 350 – No. 2015-05, 350-40, In January 2017, the FASB issued ASU No. 2017-04, FASB ASC 944 – No. 2015-09, FASB ASC 805 No. 2015-16, In January 2017, the FASB issued ASU No. 2017-01, FASB ASC 825 No. 2016-01, 825-10): available-for-sale FASB ASC 842 – No. 2016-02, right-of-use FASB ASC 405 No. 2016-04, 405-20): FASB ASC 815 No. 2016-05, de-designation In March 2016, the FASB issued ASU No. 2016-06, FASB ASC 323 No. 2016-07, step-by-step available-for-sale FASB ASC 326 – No. 2016-13, available-for-sale one-time one-time FASB ASC 230 – No. 2016-15, No. 2016-18, FASB ASC 740 – No. 2016-16, FASB ASC 810 No. 2016-17,

Basis of Presentation and Sig38

Basis of Presentation and Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2016
Accounting Policies [Abstract]
Summary of Table Reconciling Basic and Diluted Net Income Per Share	The following table reconciles basic and diluted net income per share for the years ended December 31. (dollars and shares in thousands, Years Ended December 31, except per share data) 2016 2015 2014 Basic Earnings Per Share Net income $ 134,264 $ 116,716 $ 103,667 Weighted average common shares outstanding 127,705 115,726 107,818 Basic Earnings Per Share $ 1.05 $ 1.01 $ 0.96 Diluted Earnings Per Share Net income $ 134,264 $ 116,716 $ 103,667 Weighted average common shares outstanding 127,705 115,726 107,818 Effect of dilutive securities: Restricted stock (1) 543 440 488 Stock options (2) 53 89 59 Weighted average shares outstanding 128,301 116,255 108,365 Diluted Earnings Per Share $ 1.05 $ 1.00 $ 0.95 (1) 3 thousand shares of restricted stock were not included in the computation of net income per diluted share at December 31, 2016 because the effect would be antidilutive. There were no shares excluded at December 31, 2015 or 2014 because the effect would be antidilutive. (2) Options to purchase 0.5 million shares, 0.7 million shares, and 1.0 million shares outstanding at December 31, 2016, 2015, and 2014, respectively, were not included in the computation of net income per diluted share because the exercise price of these options was greater than the average market price of the common shares and, therefore, the effect would be antidilutive.
Summary of Supplemental Cash Flow Information	The following table summarizes the supplemental cash flow information for the years ended December 31: Years Ended December 31, (dollars in thousands) 2016 2015 2014 Cash payments: Interest $ 43,698 $ 32,712 $ 21,005 Income taxes (net of refunds) 23,636 14,824 18,820 Noncash Investing and Financing Activities: Transfer of loans held for investment to loans held for sale — — 197,928 Transfer of premises and equipment to assets held for sale 4,620 9,070 3,042
Summary of Common Shares Issued and Resultant Value of Total Shareholders' Equity	The following table summarizes the common shares issued and resultant value of total shareholders’ equity associated with acquisitions for the years ended December 31: (dollars and shares in thousands) Shares of Common Stock Total 2016 Acquisition of Anchor BanCorp Wisconsin Inc. 20,415 $ 273,565 2015 Acquisition of Founders Financial Corporation 3,402 $ 50,626 2014 Acquisition of Tower Financial Corporation 5,626 $ 78,727 Acquisition of United Bancorp 9,117 123,806 Acquisition of LSB Financial Corp. 3,557 51,758

Acquisition and Divestiture A39

Acquisition and Divestiture Activity (Tables)	12 Months Ended
	Dec. 31, 2016
Summary of Unaudited Pro-Forma Information	The unaudited pro-forma pro-forma (dollars in thousands) 2016 2015 Revenue (1) $ 701,303 $ 700,500 Income before income taxes $ 241,068 $ 195,347 (1) Net interest income plus noninterest income.
Tower Financial Corporation [Member]
Schedule of Purchase Price Allocation	A summary of the final purchase price allocation is as follows (in thousands): Cash and cash equivalents $ 56,345 Investment securities 140,567 Federal Home Loan Bank stock 2,192 Loans held for sale 474 Loans 371,054 Premises and equipment 8,516 Accrued interest receivable 2,371 Other real estate owned 473 Company-owned life insurance 21,281 Other assets 15,200 Deposits (527,995 ) Securities sold under agreements to repurchase (18,898 ) Federal Home Loan Bank advances (5,500 ) Other borrowings (15,613 ) Accrued expenses and other liabilities (4,681 ) Net tangible assets acquired 45,786 Definite-lived intangible assets acquired 8,382 Goodwill 56,203 Purchase price $ 110,371
Schedule of Components of Estimated Fair Value of Intangible Assets	The components of the estimated fair value of the acquired identifiable intangible assets are in the table below. Estimated Estimated Core deposit intangible $ 4.6 7 Trust customer relationship intangible $ 3.8 12
Summary of Acquired Loan Data	Acquired loan data for Tower can be found in the table below: (in thousands) Fair Value Gross Contractual Best Estimate at Acquired receivables subject to ASC 310-30 $ 12,855 $ 22,746 $ 5,826 Acquired receivables not subject to ASC 310-30 $ 358,199 $ 450,865 $ 42,302
United Bancorp, Inc. [Member]
Schedule of Purchase Price Allocation	A summary of the final purchase price allocation is as follows (in thousands): Cash and cash equivalents $ 16,447 Investment securities 154,885 Federal Home Loan Bank stock 2,880 Loans held for sale 1,073 Loans 632,016 Premises and equipment 7,741 Accrued interest receivable 2,614 Other real estate owned 1,676 Company-owned life insurance 14,857 Other assets 16,822 Deposits (763,681 ) Federal funds purchased (10,420 ) Federal Home Loan Bank advances (12,515 ) Accrued expenses and other liabilities (8,337 ) Net tangible assets acquired 56,058 Definite-lived intangible assets acquired 10,763 Loan servicing rights 8,983 Goodwill 81,952 Purchase price $ 157,756
Schedule of Components of Estimated Fair Value of Intangible Assets	The components of the estimated fair value of the acquired identifiable intangible assets are in the table below. Estimated Estimated Core deposit intangible $ 5.9 7 Trust customer relationship intangible $ 4.9 12
Summary of Acquired Loan Data	Acquired loan data for United can be found in the table below: (in thousands) Fair Value Gross Contractual Best Estimate at Acquired receivables subject to ASC 310-30 $ 8,391 $ 15,483 $ 5,487 Acquired receivables not subject to ASC 310-30 $ 623,625 $ 798,967 $ 89,430
LSB Financial Corp. [Member]
Schedule of Purchase Price Allocation	A summary of the final purchase price allocation is as follows (in thousands): Cash and cash equivalents $ 7,589 Investment securities 63,684 Federal Home Loan Bank stock 3,185 Loans held for sale 1,035 Loans 235,377 Premises and equipment 6,492 Accrued interest receivable 1,044 Other real estate owned 30 Company-owned life insurance 7,438 Other assets 11,490 Deposits (292,068 ) Federal Home Loan Bank advances (15,203 ) Accrued expenses and other liabilities (4,582 ) Net tangible assets acquired 25,511 Definite-lived intangible assets acquired 2,618 Loan servicing rights 990 Goodwill 40,476 Purchase price $ 69,595
Summary of Acquired Loan Data	Acquired loan data for LSB can be found in the table below: (in thousands) Fair Value of Acquired Loans Gross Contractual Best Estimate at Acquisition Date of Acquired receivables subject to ASC 310-30 $ 11,986 $ 24,493 $ 9,903 Acquired receivables not subject to ASC 310-30 $ 223,391 $ 340,832 $ 57,884
Founders Financial Corporation [Member]
Schedule of Purchase Price Allocation	A summary of the final purchase price allocation is as follows (in thousands): Cash and cash equivalents $ 3,978 Investment securities 75,383 Federal Home Loan Bank stock 1,810 Loans held for sale 3,473 Loans 339,569 Premises and equipment 3,604 Accrued interest receivable 1,260 Other real estate owned 674 Company-owned life insurance 8,297 Other assets 8,804 Deposits (376,656 ) Securities sold under agreements to repurchase (12,492 ) Federal Home Loan Bank advances (26,888 ) Accrued expenses and other liabilities (1,307 ) Net tangible assets acquired 29,509 Definite-lived intangible assets acquired 5,515 Loan servicing rights 664 Goodwill 56,014 Purchase price $ 91,702
Schedule of Components of Estimated Fair Value of Intangible Assets	The components of the estimated fair value of the acquired identifiable intangible assets are in the table below. Estimated Fair Value (in millions) Estimated Useful Lives (Years) Core deposit intangible $ 2.9 7 Trust customer relationship intangible $ 2.6 12
Summary of Acquired Loan Data	Acquired loan data for Founders can be found in the table below: (in thousands) Fair Value Gross Contractual Best Estimate at Flows Not Expected Acquired receivables subject to ASC 310-30 $ 6,607 $ 11,103 $ 2,684 Acquired receivables not subject to ASC 310-30 $ 332,962 $ 439,031 $ 61,113
Anchor BanCorp Wisconsin Inc [Member]
Schedule of Purchase Price Allocation	Based on management’s preliminary valuation of the fair value of tangible and intangible assets acquired and liabilities assumed, which are based on assumptions that are subject to change, the purchase price for the Anchor acquisition is allocated as follows (in thousands): Cash and cash equivalents $ 123,657 Investment securities 235,240 Federal Home Loan Bank stock 4,596 Loans held for sale 9,334 Loans 1,637,806 Premises and equipment 35,721 Accrued interest receivable 7,308 Other real estate owned 17,349 Company-owned life insurance 7,278 Other assets 126,210 Deposits (1,852,713 ) Securities sold under agreements to repurchase (3,132 ) Other borrowings (123 ) Accrued expenses and other liabilities (36,957 ) Net tangible assets acquired 311,574 Definite-lived intangible assets acquired 21,559 Loan servicing rights 15,274 Goodwill 111,347 Purchase price $ 459,754
Summary of Acquired Loan Data	Acquired loan data for Anchor can be found in the table below: (in thousands) Fair Value of Acquired Loans at Acquisition Date Gross Contractual Best Estimate at Acquired receivables subject to ASC 310-30 $ 20,174 $ 29,544 $ 6,153 Acquired receivables not subject to ASC 310-30 $ 1,617,632 $ 2,143,532 $ 274,155

Accumulated Other Comprehensi40

Accumulated Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Dec. 31, 2016
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	The following table summarizes the changes within each classification of accumulated other comprehensive income (loss) (“AOCI”) net of tax for the years ended December 31, 2016, 2015, and 2014: (dollars in thousands) Unrealized Gains Available-for-Sale Unrealized Gains Held-to-Maturity Gains and Defined Total 2016 Balance at January 1, 2016 $ (3,806 ) $ (14,480 ) $ (9,276 ) $ (7,235 ) $ (34,797 ) Other comprehensive income (loss) before reclassifications (31,513 ) — (1,440 ) — (32,953 ) Amounts reclassified from accumulated other comprehensive income (loss) (a) (3,693 ) 1,170 4,001 6,900 8,378 Net other comprehensive income (loss) (35,206 ) 1,170 2,561 6,900 (24,575 ) Balance at December 31, 2016 $ (39,012 ) $ (13,310 ) $ (6,715 ) $ (335 ) $ (59,372 ) 2015 Balance at January 1, 2015 $ (748 ) $ (15,776 ) $ (5,935 ) $ (9,096 ) $ (31,555 ) Other comprehensive income (loss) before reclassifications 554 — (5,027 ) — (4,473 ) Amounts reclassified from accumulated other comprehensive income (loss) (a) (3,612 ) 1,296 1,686 1,861 1,231 Net other comprehensive income (loss) (3,058 ) 1,296 (3,341 ) 1,861 (3,242 ) Balance at December 31, 2015 $ (3,806 ) $ (14,480 ) $ (9,276 ) $ (7,235 ) $ (34,797 ) 2014 Balance at January 1, 2014 $ (21,108 ) $ (16,767 ) $ (190 ) $ (6,401 ) $ (44,466 ) Other comprehensive income (loss) before reclassifications 26,391 — (5,899 ) — 20,492 Amounts reclassified from accumulated other comprehensive income (loss) (a) (6,031 ) 991 154 (2,695 ) (7,581 ) Net other comprehensive income (loss) 20,360 991 (5,745 ) (2,695 ) 12,911 Balance at December 31, 2014 $ (748 ) $ (15,776 ) $ (5,935 ) $ (9,096 ) $ (31,555 ) (a) See table below for details about reclassifications.
Reclassifications out of Accumulated Other Comprehensive Income (Loss)	The following tables summarize the significant amounts reclassified out of each component of AOCI for the years ended December 31, 2016, 2015, and 2014: Details about AOCI Components Amount Reclassified from AOCI Affected Line Item in the Statement of Income Years Ended December 31, (dollars in thousands) 2016 2015 2014 Unrealized gains and losses on available-for-sale $ 5,848 $ 5,718 $ 9,830 Net securities gains — — (100 ) Impairment losses 5,848 5,718 9,730 Income before income taxes (2,155 ) (2,106 ) (3,699 ) Income tax (expense) benefit $ 3,693 $ 3,612 $ 6,031 Net income Unrealized gains and losses on held-to-maturity $ (1,776 ) $ (1,692 ) $ (1,437 ) Interest income/(expense) 606 396 446 Income tax (expense) benefit $ (1,170 ) $ (1,296 ) $ (991 ) Net income Gains and losses on cash flow hedges Interest rate contracts $ (6,453 ) $ (2,719 ) $ (248 ) Interest income/(expense) 2,452 1,033 94 Income tax (expense) benefit $ (4,001 ) $ (1,686 ) $ (154 ) Net income Amortization of defined benefit pension items Actuarial gains/(losses) and settlement cost $ (11,203 ) $ (3,002 ) $ 4,333 Salaries and employee benefits 4,303 1,141 (1,638 ) Income tax (expense) benefit $ (6,900 ) $ (1,861 ) $ 2,695 Net income Total reclassifications for the period $ (8,378 ) $ (1,231 ) $ 7,581 Net income

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Amortized Cost and Fair Value of Available-for-Sale and Held-to-Maturity Investment Securities Portfolio	The following table summarizes the amortized cost and fair value of the available-for-sale held-to-maturity (dollars in thousands) Amortized Unrealized Unrealized Fair Value 2016 Available-for-Sale U.S. Treasury $ 6,963 $ 140 $ — $ 7,103 U.S. government-sponsored entities and agencies 506,234 113 (12,391 ) 493,956 Mortgage-backed securities - Agency 1,551,465 6,923 (33,369 ) 1,525,019 States and political subdivisions 446,003 4,183 (13,502 ) 436,684 Pooled trust preferred securities 17,011 — (8,892 ) 8,119 Other securities 331,001 1,074 (5,782 ) 326,293 Total available-for-sale $ 2,858,677 $ 12,433 $ (73,936 ) $ 2,797,174 Held-to-Maturity U.S. government-sponsored entities and agencies $ 40,131 $ 427 $ — $ 40,558 Mortgage-backed securities - Agency 10,640 300 — 10,940 States and political subdivisions 694,319 38,915 (560 ) 732,674 Total held-to-maturity $ 745,090 $ 39,642 $ (560 ) $ 784,172 2015 Available-for-Sale U.S. Treasury $ 11,968 $ 190 $ (8 ) $ 12,150 U.S. government-sponsored entities and agencies 615,578 1,495 (3,523 ) 613,550 Mortgage-backed securities - Agency 1,065,936 10,970 (10,545 ) 1,066,361 States and political subdivisions 375,671 11,960 (335 ) 387,296 Pooled trust preferred securities 17,320 — (9,420 ) 7,900 Other securities 337,590 1,151 (7,777 ) 330,964 Total available-for-sale $ 2,424,063 $ 25,766 $ (31,608 ) $ 2,418,221 Held-to-Maturity U.S. government-sponsored entities and agencies $ 142,864 $ 2,899 $ — $ 145,763 Mortgage-backed securities - Agency 16,042 562 — 16,604 States and political subdivisions 713,205 53,848 (3 ) 767,050 Total held-to-maturity $ 872,111 $ 57,309 $ (3 ) $ 929,417
Schedule of Proceeds from Sales or Calls and Realized Gain and Losses of Available-for-Sale Investment Securities and Other Securities	Proceeds from sales or calls of available-for-sale (dollars in thousands) 2016 2015 2014 Proceeds from sales of available-for-sale $ 243,312 $ 343,486 $ 214,912 Proceeds from calls of available-for-sale 635,624 404,277 123,141 Total $ 878,936 $ 747,763 $ 338,053 Realized gains on sales of available-for-sale $ 5,423 $ 5,640 $ 9,938 Realized gains on calls of available-for-sale 922 605 154 Realized losses on sales of available-for-sale (450 ) (518 ) (128 ) Realized losses on calls of available-for-sale (147 ) (15 ) (471 ) Other securities gains (1) 100 6 337 Net securities gains $ 5,848 $ 5,718 $ 9,830 (1) Other securities gains includes net realized gains or losses associated with trading securities and mutual funds.
Expected Maturities of Investment Securities Portfolio	Weighted average yield is based on amortized cost. At December 31, 2016 (dollars in thousands) Maturity Amortized Fair Value Weighted Available-for-Sale Within one year $ 37,370 $ 37,431 1.72 % One to five years 320,815 318,852 2.18 Five to ten years 329,607 329,892 2.85 Beyond ten years 2,170,885 2,110,999 2.43 Total $ 2,858,677 $ 2,797,174 2.44 % Held-to-Maturity Within one year $ 10,796 $ 10,906 4.02 % One to five years 74,451 77,228 4.71 Five to ten years 129,452 135,004 4.86 Beyond ten years 530,391 561,034 5.58 Total $ 745,090 $ 784,172 5.35 %
Investment Securities with Unrealized Losses by Aggregated Major Security Type and Length of Time in Continuous Unrealized Loss Position	The following table summarizes the investment securities with unrealized losses at December 31 by aggregated major security type and length of time in a continuous unrealized loss position: Less than 12 months 12 months or longer Total (dollars in thousands) Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized 2016 Available-for-Sale U.S. Treasury $ — $ — $ — $ — $ — $ — U.S. government-sponsored entities and agencies 432,192 (12,391 ) — — 432,192 (12,391 ) Mortgage-backed securities - Agency 1,177,093 (30,295 ) 57,636 (3,074 ) 1,234,729 (33,369 ) States and political subdivisions 286,351 (13,247 ) 4,919 (255 ) 291,270 (13,502 ) Pooled trust preferred securities — — 8,119 (8,892 ) 8,119 (8,892 ) Other securities 121,498 (2,734 ) 126,539 (3,048 ) 248,037 (5,782 ) Total available-for-sale $ 2,017,134 $ (58,667 ) $ 197,213 $ (15,269 ) $ 2,214,347 $ (73,936 ) Held-to-Maturity States and political subdivisions $ 59,481 $ (560 ) $ — $ — $ 59,481 $ (560 ) Total held-to-maturity $ 59,481 $ (560 ) $ — $ — $ 59,481 $ (560 ) 2015 Available-for-Sale U.S. Treasury $ 6,505 $ (8 ) $ — $ — $ 6,505 $ (8 ) U.S. government-sponsored entities and agencies 160,751 (1,492 ) 122,581 (2,031 ) 283,332 (3,523 ) Mortgage-backed securities - Agency 256,359 (3,444 ) 239,047 (7,101 ) 495,406 (10,545 ) States and political subdivisions 38,373 (161 ) 5,137 (174 ) 43,510 (335 ) Pooled trust preferred securities — — 7,900 (9,420 ) 7,900 (9,420 ) Other securities 156,604 (2,717 ) 126,661 (5,060 ) 283,265 (7,777 ) Total available-for-sale $ 618,592 $ (7,822 ) $ 501,326 $ (23,786 ) $ 1,119,918 $ (31,608 ) Held-to-Maturity States and political subdivisions $ 2,026 $ (3 ) $ — $ — $ 2,026 $ (3 ) Total held-to-maturity $ 2,026 $ (3 ) $ — $ — $ 2,026 $ (3 )
Trust Preferred Securities	The table below summarizes the relevant characteristics of our pooled trust preferred securities as well as our single issuer trust preferred securities that are included in the “other securities” category in this footnote. Each of the pooled trust preferred securities support a more senior tranche of security holders. All three pooled trust preferred securities have experienced credit defaults. However, two of these securities have excess subordination and are not other-than-temporarily impaired as a result of their class hierarchy, which provides more loss protection. Trust preferred securities December 31, 2016 (dollars in thousands) Class Lowest Amortized Fair Unrealized Realized # of Issuers Actual Expected Excess Pooled trust preferred securities: Reg Div Funding 2004 B-2 D $ 3,111 $ 251 $ (2,860 ) $ — 21/38 34.7 % 8.4 % 0.0 % Pretsl XXVII LTD B B 4,422 2,333 (2,089 ) — 35/44 16.7 % 12.2 % 32.3 % Trapeza Ser 13A A2A BBB 9,478 5,535 (3,943 ) — 50/55 4.5 % 8.3 % 49.7 % 17,011 8,119 (8,892 ) — Single Issuer trust preferred securities: Fleet Cap Tr V (BOA) BB+ 3,397 3,045 (352 ) — JP Morgan Chase Cap XIII BBB- 4,767 4,369 (398 ) — NB-Global BB+ 786 905 119 — Chase Cap II BBB- 822 891 69 — 9,772 9,210 (562 ) — Total $ 26,783 $ 17,329 $ (9,454 ) $ — (1) Lowest rating for the security provided by any nationally recognized credit rating agency.

Finance Receivables and Allow42

Finance Receivables and Allowance for Credit Losses (Tables)	12 Months Ended
	Dec. 31, 2016
Text Block [Abstract]
Schedule of Composition of Loans	The composition of loans at December 31 by lending classification was as follows: (dollars in thousands) 2016 2015 Commercial (1) $ 1,917,099 $ 1,804,615 Commercial real estate: Construction 199,509 185,449 Other 2,931,344 1,662,372 Residential real estate 2,087,530 1,644,614 Consumer credit: Home equity 476,439 359,954 Auto 1,167,737 1,050,336 Other 230,854 133,478 Covered loans — 107,587 Total loans 9,010,512 6,948,405 Allowance for loan losses (49,808 ) (51,296 ) Allowance for loan losses - covered loans — (937 ) Net loans $ 8,960,704 $ 6,896,172 (1) Includes direct finance leases of $10.8 million at December 31, 2016 and $14.4 million at December 31, 2015.
Schedule of Activity in Related Party Loans	Activity in related party loans during 2016 is presented in the following table: (dollars in thousands) 2016 Balance at January 1, $ 8,145 New loans 5,813 Repayments (5,464 ) Balance at December 31, $ 8,494
Schedule of Activity in Allowance for Loan Losses	Old National’s activity in the allowance for loan losses for the years ended December 31, 2016, 2015, and 2014 was as follows: (dollars in thousands) Commercial Commercial Residential Consumer Unallocated Total 2016 Allowance for loan losses: Beginning balance $ 26,347 $ 15,993 $ 2,051 $ 7,842 $ — $ 52,233 Charge-offs (5,047 ) (2,632 ) (800 ) (6,131 ) — (14,610 ) Recoveries 3,102 4,763 174 3,186 — 11,225 Provision (2,921 ) 49 218 3,614 — 960 Ending balance $ 21,481 $ 18,173 $ 1,643 $ 8,511 $ — $ 49,808 2015 Allowance for loan losses: Beginning balance $ 20,670 $ 17,348 $ 2,962 $ 6,869 $ — $ 47,849 Charge-offs (3,513 ) (1,921 ) (1,039 ) (6,404 ) — (12,877 ) Recoveries 5,218 4,685 354 4,081 — 14,338 Provision 3,972 (4,119 ) (226 ) 3,296 — 2,923 Ending balance $ 26,347 $ 15,993 $ 2,051 $ 7,842 $ — $ 52,233 2014 Allowance for loan losses: Beginning balance $ 16,565 $ 22,401 $ 3,239 $ 4,940 $ — $ 47,145 Charge-offs (3,535 ) (3,647 ) (793 ) (4,675 ) — (12,650 ) Recoveries 3,125 3,871 205 3,056 — 10,257 Provision 4,515 (5,277 ) 311 3,548 — 3,097 Ending balance $ 20,670 $ 17,348 $ 2,962 $ 6,869 $ — $ 47,849
Schedule of Recorded Investment in Financing Receivables	The following table provides Old National’s recorded investment in financing receivables by portfolio segment at December 31, 2016 and 2015 and other information regarding the allowance: (dollars in thousands) Commercial Commercial Residential Consumer Unallocated Total December 31, 2016 Allowance for loan losses: Individually evaluated for impairment $ 4,561 $ 3,437 $ — $ — $ — $ 7,998 Collectively evaluated for impairment 16,838 14,717 1,643 8,334 — 41,532 Loans acquired with deteriorated credit quality 82 19 — 177 — 278 Total allowance for loan losses $ 21,481 $ 18,173 $ 1,643 $ 8,511 $ — $ 49,808 Loans and leases outstanding: Individually evaluated for impairment $ 45,960 $ 57,230 $ — $ — $ — $ 103,190 Collectively evaluated for impairment 1,870,289 3,040,849 2,073,950 1,866,815 — 8,851,903 Loans acquired with deteriorated credit quality 850 32,774 13,580 8,215 — 55,419 Total loans and leases outstanding $ 1,917,099 $ 3,130,853 $ 2,087,530 $ 1,875,030 $ — $ 9,010,512 December 31, 2015 Allowance for loan losses: Individually evaluated for impairment $ 7,467 $ 4,021 $ — $ — $ — $ 11,488 Collectively evaluated for impairment 18,295 11,439 2,038 7,614 — 39,386 Loans acquired with deteriorated credit quality 247 533 13 70 — 863 Covered loans acquired with deteriorated credit quality 338 — — 158 — 496 Total allowance for loan losses $ 26,347 $ 15,993 $ 2,051 $ 7,842 $ — $ 52,233 Loans and leases outstanding: Individually evaluated for impairment $ 60,959 $ 41,987 $ — $ — $ — $ 102,946 Collectively evaluated for impairment 1,750,397 1,779,062 1,644,631 1,590,288 — 6,764,378 Loans acquired with deteriorated credit quality 691 28,499 127 3,925 — 33,242 Covered loans acquired with deteriorated credit quality 2,893 19,424 16,577 8,945 — 47,839 Total loans and leases outstanding $ 1,814,940 $ 1,868,972 $ 1,661,335 $ 1,603,158 $ — $ 6,948,405
Schedule of Risk Category of Commercial and Commercial Real Estate Loans	As of December 31, 2016 and 2015, the risk category of commercial and commercial real estate loans by class of loans was as follows: (dollars in thousands) Corporate Credit Exposure Credit Risk Profile by Internally Assigned Grade Commercial Commercial Real Estate - Commercial Real Estate - Other 2016 2015 (1) 2016 2015 (1) 2016 2015 (1) Grade: Pass $ 1,750,923 $ 1,672,672 $ 194,875 $ 182,701 $ 2,822,340 $ 1,508,309 Criticized 45,614 55,570 229 3,300 49,619 75,477 Classified - substandard 63,978 24,723 1,636 1,857 18,128 49,091 Classified - nonaccrual 53,062 58,469 2,769 830 32,234 39,521 Classified - doubtful 3,522 3,506 — — 9,023 7,886 Total $ 1,917,099 $ 1,814,940 $ 199,509 $ 188,688 $ 2,931,344 $ 1,680,284 (1) Includes loans previously covered by loss share agreements with the FDIC.
Schedule of Recorded Investment in Residential and Consumer Loans Based on Payment Activity	The following table presents the recorded investment in residential and consumer loans based on payment activity as of December 31, 2016 and 2015: (dollars in thousands) Consumer Residential Home Auto Other 2016 Performing $ 2,069,856 $ 472,008 $ 1,166,114 $ 223,786 Nonperforming 17,674 4,431 1,623 7,068 Total $ 2,087,530 $ 476,439 $ 1,167,737 $ 230,854 2015 (1) Performing $ 1,645,293 $ 410,243 $ 1,048,763 $ 138,031 Nonperforming 16,042 3,051 1,573 1,497 Total $ 1,661,335 $ 413,294 $ 1,050,336 $ 139,528 (1) Includes loans previously covered by loss share agreements with the FDIC.
Schedule of Impaired Loans	The following table shows Old National’s impaired loans as of December 31, 2016 and 2015, respectively. Only purchased loans that have experienced subsequent impairment since the date acquired are included in the table below. (dollars in thousands) Recorded Unpaid Related December 31, 2016 With no related allowance recorded: Commercial $ 29,001 $ 29,634 $ — Commercial Real Estate - Other 30,585 32,413 — Residential 1,610 1,631 — Consumer 827 946 — With an allowance recorded: Commercial 16,959 17,283 4,561 Commercial Real Estate - Construction 467 467 107 Commercial Real Estate - Other 26,178 26,710 3,330 Residential 1,081 1,081 54 Consumer 1,924 1,924 96 Total $ 108,632 $ 112,089 $ 8,148 December 31, 2015 (1) With no related allowance recorded: Commercial $ 40,414 $ 41,212 $ — Commercial Real Estate - Other 26,998 30,264 — Residential 1,383 1,422 — Consumer 1,201 1,305 — With an allowance recorded: Commercial 16,377 16,483 7,111 Commercial Real Estate - Construction 237 237 6 Commercial Real Estate - Other 14,752 14,802 4,015 Residential 985 985 49 Consumer 2,525 2,525 126 Total $ 104,872 $ 109,235 $ 11,307 (1) Does not include $4.2 million of loans that were previously covered by loss share agreements with the FDIC.
Schedule of Average Balance of Impaired Loans	The average balance of impaired loans for the years ended December 31, 2016 and 2015 are included in the table below. (dollars in thousands) 2016 2015 (1) Average Recorded Investment With no related allowance recorded: Commercial $ 34,708 $ 33,678 Commercial Real Estate - Construction — 1,085 Commercial Real Estate - Other 28,793 28,637 Residential 1,355 985 Consumer 855 943 With an allowance recorded: Commercial 16,669 11,924 Commercial Real Estate - Construction 352 168 Commercial Real Estate - Other 20,465 14,593 Residential 1,074 1,230 Consumer 2,367 2,034 Total $ 106,638 $ 95,277 (1) Does not include $4.2 million of loans that were previously covered by loss share agreements with the FDIC.
Schedule of Past Due Financing Receivables	Old National’s past due financing receivables as of December 31 were as follows: (dollars in thousands) 30-59 Days 60-89 Days Recorded Nonaccrual Total Current December 31, 2016 Commercial $ 847 $ 279 $ 23 $ 56,585 $ 57,734 $ 1,859,365 Commercial Real Estate: Construction — — — 2,769 2,769 196,740 Other 1,652 150 — 41,257 43,059 2,888,285 Residential 17,786 3,770 2 17,674 39,232 2,048,298 Consumer: Home equity 1,511 423 — 4,431 6,365 470,074 Auto 5,903 1,037 242 1,623 8,805 1,158,932 Other 3,561 1,919 61 7,068 12,609 218,245 Total $ 31,260 $ 7,578 $ 328 $ 131,407 $ 170,573 $ 8,839,939 December 31, 2015 Commercial $ 802 $ 100 $ 565 $ 57,536 $ 59,003 $ 1,745,612 Commercial Real Estate: Construction — — — 749 749 184,700 Other 438 135 — 46,601 47,174 1,615,198 Residential 9,300 2,246 114 14,953 26,613 1,618,001 Consumer: Home equity 283 402 — 2,369 3,054 356,900 Auto 3,804 730 202 1,573 6,309 1,044,027 Other 830 165 25 1,256 2,276 131,202 Covered loans 809 312 10 7,336 8,467 99,120 Total $ 16,266 $ 4,090 $ 916 $ 132,373 $ 153,645 $ 6,794,760
Schedule of Activity in Trouble Debt Restructurings	The following table presents activity in TDRs for the years ended December 31, 2016, 2015, and 2014: (dollars in thousands) Commercial Commercial Residential Consumer Total 2016 Balance at January 1, 2016 $ 23,354 $ 14,602 $ 2,693 $ 3,602 $ 44,251 (Charge-offs)/recoveries (1,982 ) 953 42 (6 ) (993 ) Payments (21,956 ) (10,157 ) (513 ) (1,381 ) (34,007 ) Additions 14,996 11,130 761 385 27,272 Interest collected on nonaccrual loans 2,390 1,799 2 2 4,193 Balance at December 31, 2016 $ 16,802 $ 18,327 $ 2,985 $ 2,602 $ 40,716 2015 Balance at January 1, 2015 $ 15,205 $ 15,226 $ 2,063 $ 2,459 $ 34,953 (Charge-offs)/recoveries 872 1,064 (64 ) 3 1,875 Payments (29,913 ) (6,273 ) (658 ) (1,168 ) (38,012 ) Additions 37,190 4,585 1,352 2,308 45,435 Balance at December 31, 2015 $ 23,354 $ 14,602 $ 2,693 $ 3,602 $ 44,251 2014 Balance at January 1, 2014 $ 22,443 $ 22,639 $ 2,344 $ 1,441 $ 48,867 (Charge-offs)/recoveries 126 795 10 (102 ) 829 Payments (18,281 ) (9,722 ) (466 ) (466 ) (28,935 ) Additions 13,696 3,554 175 1,586 19,011 Removals - subsequent restructuring (2,779 ) (2,040 ) — — (4,819 ) Balance at December 31, 2014 $ 15,205 $ 15,226 $ 2,063 $ 2,459 $ 34,953
Schedule of Loans by Class Modified as Troubled Debt Restructuring	The following table presents loans by class modified as TDRs that occurred during the years ended December 31, 2016, 2015, and 2014: (dollars in thousands) Number of Loans Pre-modification Outstanding Recorded Investment Post-modification Outstanding Recorded Investment 2016 Troubled Debt Restructuring: Commercial 20 $ 14,996 $ 14,996 Commercial Real Estate - Other 10 11,130 11,130 Residential 6 761 761 Consumer 8 385 385 Total 44 $ 27,272 $ 27,272 2015 Troubled Debt Restructuring: Commercial 42 $ 37,190 $ 37,190 Commercial Real Estate - Construction 5 1,162 1,162 Commercial Real Estate - Other 27 3,423 3,423 Residential 13 1,352 1,352 Consumer 32 2,308 2,308 Total 119 $ 45,435 $ 45,435 2014 Troubled Debt Restructuring: Commercial 32 $ 13,696 $ 13,696 Commercial Real Estate - Construction 1 484 484 Commercial Real Estate - Other 34 3,070 3,070 Residential 2 175 175 Consumer 28 1,586 1,586 Total 97 $ 19,011 $ 19,011
Schedule of Activity of Purchased Impaired Loans	For these loans that meet the criteria of ASC 310-30 December 31, (dollars in thousands) 2016 2015 (1) Commercial $ 850 $ 3,584 Commercial real estate 32,774 47,923 Residential 13,580 16,704 Consumer 8,215 12,870 Carrying amount 55,419 81,081 Allowance for loan losses (278 ) (1,359 ) Carrying amount, net of allowance $ 55,141 $ 79,722 (1) Includes loans previously covered by loss share agreements with the FDIC.
Schedule of Accretable Yield of Purchased Credit Impaired Loans, or Income Expected to be Collected	Accretable yield of purchased credit impaired loans, or income expected to be collected, was as follows: (dollars in thousands) 2016 2015 2014 Balance at January 1, $ 45,310 $ 62,533 $ 101,502 New loans purchased 3,217 1,812 8,274 Accretion of income (23,447 ) (35,526 ) (77,929 ) Reclassifications from (to) nonaccretable difference 10,589 14,189 27,536 Disposals/other adjustments (2,066 ) 2,302 3,150 Balance at December 31, $ 33,603 $ 45,310 $ 62,533
Schedule of Receivables for which Contractually Required Payments would not be Collected	PCI loans purchased during 2016 and 2015 for which it was probable at acquisition that all contractually required payments would not be collected were as follows: (dollars in thousands) Anchor (1) Founders (2) Contractually required payments $ 29,544 $ 11,103 Nonaccretable difference (6,153 ) (2,684 ) Cash flows expected to be collected at acquisition 23,391 8,419 Accretable yield (3,217 ) (1,812 ) Fair value of acquired loans at acquisition $ 20,174 $ 6,607 (1) Old National acquired Anchor effective May 1, 2016. (2) Old National acquired Founders effective January 1, 2015.

Covered Loans (Tables)

Covered Loans (Tables)	12 Months Ended
	Dec. 31, 2016
Text Block [Abstract]
Schedule of Covered Acquired Impaired Loans	The following table is a roll-forward of covered acquired impaired loans accounted for under ASC 310-30 (dollars in thousands) Contractual Nonaccretable Accretable Carrying 2016 Balance at January 1, 2016 $ 69,857 $ (4,729 ) $ (17,785 ) $ 47,343 Principal reductions and interest payments (18,195 ) (347 ) — (18,542 ) Accretion of loan discount — — 7,196 7,196 Changes in contractual and expected cash flows due to remeasurement 4,431 631 (4,927 ) 135 Removals due to foreclosure or sale (1,948 ) 136 263 (1,549 ) Loans removed from loss share coverage (54,145 ) 4,309 15,253 (34,583 ) Balance at December 31, 2016 $ — $ — $ — $ — 2015 Balance at January 1, 2015 $ 124,809 $ (12,014 ) $ (35,742 ) $ 77,053 Principal reductions and interest payments (43,792 ) (1,666 ) — (45,458 ) Accretion of loan discount — — 21,529 21,529 Changes in contractual and expected cash flows due to remeasurement (4,139 ) 8,409 (4,109 ) 161 Removals due to foreclosure or sale (1,316 ) 463 (244 ) (1,097 ) Loans removed from loss share coverage (5,705 ) 79 781 (4,845 ) Balance at December 31, 2015 $ 69,857 $ (4,729 ) $ (17,785 ) $ 47,343 (1) The balance of contractual cash flows includes future contractual interest and is net of amounts charged off and interest collected on nonaccrual loans. (2) Carrying amount for this table is net of allowance for loan losses.
Summary of FDIC Loss Sharing Asset	The following table shows a detailed analysis of the FDIC loss sharing asset for the years ended December 31, 2016 and 2015. As a result of the termination of the loss share agreements on June 22, 2016, the table below reflects the write-off (dollars in thousands) 2016 2015 Balance at January 1, $ 9,030 $ 20,603 Adjustments not reflected in income: Cash received from the FDIC (10,000 ) (3,548 ) Other 512 1,009 Adjustments reflected in income: Amortization (816 ) (10,709 ) Higher (lower) loan loss expectations (13 ) 275 Impairment/(recovery) of value and net (gain)/loss on sales of other real estate 1,062 1,400 Gain as a result of the early termination agreement with the FDIC, effective June 22, 2016 225 — Balance at December 31, $ — $ 9,030

Other Real Estate Owned (Tables

Other Real Estate Owned (Tables)	12 Months Ended
	Dec. 31, 2016
Banking and Thrift [Abstract]
Activity in Other Real Estate Owned	The following table presents activity in other real estate owned for the years ended December 31, 2016 and 2015: (dollars in thousands) Other Real Estate Other Real Estate 2016 Balance at January 1, 2016 $ 7,594 $ 4,904 Additions (2) 22,905 2,093 Sales (13,638 ) (1,454 ) (Impairment)/recovery of value (1,986 ) (1,872 ) Reclassification due to termination of the loss share agreements, effective June 22, 2016 3,671 (3,671 ) Balance at December 31, 2016 $ 18,546 $ — 2015 Balance at January 1, 2015 $ 7,241 $ 9,121 Additions 5,665 1,487 Sales (5,710 ) (5,373 ) (Impairment)/recovery of value 398 (331 ) Balance at December 31, 2015 $ 7,594 $ 4,904 (1) Includes repossessed personal property of $0.3 million at December 31, 2016 and $0.2 million at December 31, 2015. (2) Includes other real estate owned of $17.3 million acquired from Anchor in May 2016.

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Summary of Premises and Equipment	The composition of premises and equipment was as follows at December 31: (dollars in thousands) 2016 2015 Land $ 71,769 $ 41,604 Buildings 322,165 111,982 Furniture, fixtures, and equipment 102,631 94,819 Leasehold improvements 28,555 33,111 Total 525,120 281,516 Accumulated depreciation (95,498 ) (84,840 ) Premises and equipment, net $ 429,622 $ 196,676
Summary of Future Minimum Lease Commitments	The following is a summary of future minimum lease commitments as of December 31, 2016: (dollars in thousands) 2017 $ 16,928 2018 15,918 2019 15,262 2020 14,679 2021 14,161 Thereafter 79,881 Total $ 156,829

Goodwill and Other Intangible46

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Changes in Carrying Amount of Goodwill	The following table shows the changes in the carrying amount of goodwill for the years ended December 31, 2016 and 2015: (dollars in thousands) 2016 2015 Balance at January 1, $ 584,634 $ 530,845 Acquisitions 111,347 57,619 Divestitures (40,963 ) (3,830 ) Balance at December 31, $ 655,018 $ 584,634
Schedule of Gross Carrying Amounts and Accumulated Amortization of Other Intangible Assets	The gross carrying amounts and accumulated amortization of other intangible assets at December 31, 2016 and 2015 was as follows: (dollars in thousands) Gross Accumulated Net 2016 Amortized intangible assets: Core deposit $ 81,663 $ (53,214 ) $ 28,449 Customer trust relationships 16,547 (7,753 ) 8,794 Customer loan relationships 4,413 (3,979 ) 434 Total intangible assets $ 102,623 $ (64,946 ) $ 37,677 2015 Amortized intangible assets: Core deposit $ 60,103 $ (43,982 ) $ 16,121 Customer business relationships 30,787 (23,341 ) 7,446 Customer trust relationships 16,547 (5,286 ) 11,261 Customer loan relationships 4,413 (3,933 ) 480 Total intangible assets $ 111,850 $ (76,542 ) $ 35,308
Schedule of Estimated Amortization Expense for Future Years	Estimated amortization expense for future years is as follows: (dollars in thousands) 2017 $ 11,015 2018 8,687 2019 6,737 2020 4,883 2021 3,111 Thereafter 3,244 Total $ 37,677

Loan Servicing Rights (Tables)

Loan Servicing Rights (Tables)	12 Months Ended
	Dec. 31, 2016
Text Block [Abstract]
Components of Loan Servicing Rights and Valuation Allowance	The following table summarizes the activity related to loan servicing rights and the related valuation allowance in 2016 and 2015: (dollars in thousands) 2016 2015 Balance at January 1, $ 10,502 $ 9,584 Additions (1) 20,280 3,187 Amortization (5,153 ) (2,269 ) Balance before valuation allowance at December 31, 25,629 10,502 Valuation allowance: Balance at January 1, (34 ) (50 ) (Additions)/recoveries (34 ) 16 Balance at December 31, (68 ) (34 ) Loan servicing rights, net $ 25,561 $ 10,468 (1) In May 2016, the Company assumed $15.3 million of loan servicing rights related to the Anchor acquisition.

Qualified Affordable Housing 48

Qualified Affordable Housing Projects and Other Tax Credit Investments (Tables)	12 Months Ended
	Dec. 31, 2016
Accounting Policies [Abstract]
Schedule of Qualified Affordable Housing Projects and Other Tax Credit Investments	The following table summarizes Old National’s investments in Low Income Housing Tax Credits (“LIHTC”), Federal Historic Tax Credits (“FHTC”), Federal New Market Tax Credits (“NMTC”), and Indiana Community Revitalization Enhancement District Tax Credits (“CReED”) at December 31, 2016: (dollars in thousands) Years Ended Years Ended At December 31, 2016 2016 2015 2016 2015 Investment Accounting Method Investment Unfunded Amortization Tax Benefit LIHTC and other qualifying investments Proportional amortization $ 29,110 $ 16,210 $ 804 $ 804 $ (1,125 ) $ (1,125 ) FHTC Equity 4,434 3,104 — — — — CReED Equity 1,504 1,502 — — — — NMTC Equity — — — 143 — (233 ) Total $ 35,048 $ 20,816 $ 804 $ 947 $ (1,125 ) $ (1,358 ) (1) All commitments will be paid by the Company by 2027.

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2016
Banking and Thrift [Abstract]
Schedule of Maturities of Total Time Deposits	At December 31, 2016, the scheduled maturities of total time deposits were as follows: (dollars in thousands) Due in 2017 $ 895,033 Due in 2018 292,371 Due in 2019 108,978 Due in 2020 86,090 Due in 2021 44,005 Thereafter 41,631 Total $ 1,468,108

Securities Sold Under Agreeme50

Securities Sold Under Agreements to Repurchase (Tables)	12 Months Ended
	Dec. 31, 2016
Transfers and Servicing [Abstract]
Schedule of Securities Sold under Agreements to Repurchase and Related Weighted-Average Interest Rates	The following table presents securities sold under agreements to repurchase and related weighted-average interest rates for each of the years ended December 31: (dollars in thousands) 2016 2015 Outstanding at year-end $ 367,052 $ 387,409 Average amount outstanding 368,757 406,117 Maximum amount outstanding at any month-end 396,695 419,515 Weighted average interest rate: During year 0.41 % 0.37 % End of year 0.47 0.38
Schedule of Remaining Contractual Maturity of Secured Borrowings and Class of Collateral Pledged Under Repurchase Agreements	The following table presents the contractual maturity of our secured borrowings and class of collateral pledged: At December 31, 2016 Remaining Contractual Maturity of the Agreements (dollars in thousands) Overnight and Up to 30 Days 30-90 Days Greater Than Total Repurchase Agreements: U.S. Treasury and agency securities $ 317,052 $ 25,000 $ — $ 25,000 $ 367,052 Total $ 317,052 $ 25,000 $ — $ 25,000 $ 367,052

Federal Home Loan Bank Advanc51

Federal Home Loan Bank Advances (Tables)	12 Months Ended
	Dec. 31, 2016
Banking and Thrift [Abstract]
Summary of FHLB Advances	The following table summarizes Old National Bank’s FHLB advances at December 31: (dollars in thousands) 2016 2015 Federal Home Loan Bank advances (fixed rates 0.56% to 6.76% and variable rates 0.99% to 1.05%) maturing January 2017 to January 2025 $ 1,353,225 $ 1,022,766 ASC 815 fair value hedge and other basis adjustments (133 ) 725 Total other borrowings $ 1,353,092 $ 1,023,491
Summary of Contractual Maturities of FHLB Advances	Contractual maturities of FHLB advances at December 31, 2016, were as follows: (dollars in thousands) Due in 2017 $ 945,544 Due in 2018 170,090 Due in 2019 2,415 Due in 2020 50,000 Due in 2021 — Thereafter 185,176 ASC 815 fair value hedge and other basis adjustments (133 ) Total $ 1,353,092

Other Borrowings (Tables)

Other Borrowings (Tables)	12 Months Ended
	Dec. 31, 2016
Other Liabilities Disclosure [Abstract]
Other Borrowings	The following table summarizes Old National and its subsidiaries’ other borrowings at December 31: (dollars in thousands) 2016 2015 Old National Bancorp: Senior unsecured bank notes (fixed rate 4.125%) $ 175,000 $ 175,000 maturing August 2024 Unamortized debt issuance costs related to Senior unsecured bank notes (1,182 ) (1,338 ) Junior subordinated debentures (variable rates of 2.30% to 2.74%) maturing March 2035 to September 2037 45,000 45,000 Other basis adjustments (3,971 ) (4,442 ) Old National Bank: Capital lease obligation 4,092 4,036 Total other borrowings $ 218,939 $ 218,256
Contractual Maturities of Other Borrowings	Contractual maturities of other borrowings at December 31, 2016, were as follows: (dollars in thousands) Due in 2017 $ 196 Due in 2018 79 Due in 2019 85 Due in 2020 91 Due in 2021 99 Thereafter 223,542 Unamortized debt issuance costs and other basis adjustments (5,153 ) Total $ 218,939
Future Minimum Lease Payments under Capital Lease Arrangements	At December 31, 2016, the future minimum lease payments under the capital lease arrangements were as follows: (dollars in thousands) 2017 $ 535 2018 410 2019 430 2020 430 2021 430 Thereafter 7,976 Total minimum lease payments 10,211 Less amounts representing interest (6,119 ) Present value of net minimum lease payments $ 4,092

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Summary of Differences in Taxes from Continuing Operations Computed at Statutory Rate	Following is a summary of the major items comprising the differences in taxes from continuing operations computed at the federal statutory rate and as recorded in the consolidated statement of income for the years ended December 31: (dollars in thousands) 2016 2015 2014 Provision at statutory rate of 35% $ 70,149 $ 57,013 $ 49,688 Tax-exempt Tax-exempt (14,356 ) (13,111 ) (11,460 ) Section 291/265 interest disallowance 191 142 93 Company-owned life insurance income (2,968 ) (3,011 ) (2,423 ) Tax-exempt (17,133 ) (15,980 ) (13,790 ) Reserve for unrecognized tax benefits (1 ) (5 ) (1,076 ) State income taxes 3,461 4,173 2,676 ONB Insurance Group, Inc. nondeductible goodwill 8,328 — — Effect of Illinois branch sale — 1,835 — State statutory rate change — — 904 Other, net 1,358 (859 ) (105 ) Income tax expense $ 66,162 $ 46,177 $ 38,297 Effective tax rate 33.0 % 28.3 % 27.0 %
Provision for Income Taxes	The provision for income taxes consisted of the following components for the years ended December 31: (dollars in thousands) 2016 2015 2014 Income taxes currently payable: Federal $ 23,735 $ 17,385 $ 8,974 State 2,242 769 581 Deferred income taxes related to: Federal 35,955 24,664 27,207 State 4,230 3,359 1,535 Deferred income tax expense 40,185 28,023 28,742 Income tax expense $ 66,162 $ 46,177 $ 38,297
Schedule of Significant Components of Net Deferred Tax Assets (Liabilities)	Significant components of net deferred tax assets (liabilities) were as follows at December 31: (dollars in thousands) 2016 2015 Deferred Tax Assets Allowance for loan losses, net of recapture $ 19,773 $ 17,125 Benefit plan accruals 23,846 18,066 Alternative minimum tax credit 19,523 18,378 Unrealized losses on benefit plans 205 4,507 Net operating loss carryforwards 66,917 2,041 Premises and equipment — 12,735 Federal tax credits 35 422 Other-than-temporary impairment 3,606 3,558 Acquired loans 40,522 34,870 Lease exit obligation 2,060 2,626 Unrealized losses on available-for-sale 23,365 3,002 Unrealized losses on held-to-maturity 7,118 7,724 Unrealized losses on hedges 4,116 5,685 Other real estate owned 3,310 — Other, net 2,675 4,914 Total deferred tax assets 217,071 135,653 Deferred Tax Liabilities Accretion on investment securities (700 ) (599 ) Other real estate owned — (284 ) Purchase accounting (17,552 ) (16,615 ) FDIC indemnification asset — (2,565 ) Loan servicing rights (9,627 ) (3,890 ) Premises and equipment (4,800 ) — Other, net (2,529 ) (1,716 ) Total deferred tax liabilities (35,208 ) (25,669 ) Net deferred tax assets $ 181,863 $ 109,984
Summary of Reconciliation of Unrecognized Tax Benefits	A reconciliation of the beginning and ending amount of unrecognized tax benefits was as follows: (dollars in thousands) 2016 2015 2014 Balance at January 1, $ 124 $ 77 $ 3,847 Additions based on tax positions related to the current year 118 51 37 Additions based on tax positions related to prior years 537 — — Reductions due to statute of limitations expiring (2 ) (4 ) (3,807 ) Balance at December 31, $ 777 $ 124 $ 77

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2016
Compensation and Retirement Disclosure [Abstract]
Summary of the Activity of the Restoration Plan	The following table presents the activity of the Restoration Plan for the years ended December 31, 2016 and 2015: (dollars in thousands) 2016 2015 Change in Projected Benefit Obligation Balance at January 1, $ 1,239 $ 1,346 Interest cost 52 45 Benefits paid (39 ) (65 ) Actuarial loss (gain) 103 (87 ) Settlement (219 ) — Projected benefit obligation at December 31, $ 1,136 $ 1,239 Change in Plan Assets Fair value at January 1, — — Employer contributions 257 65 Benefits paid (39 ) (65 ) Settlement (218 ) — Fair value of plan assets at December 31, — — Funded status at December 31, $ (1,136 ) $ (1,239 ) Amounts recognized in the statement of financial position at December 31: Accrued benefit liability $ (1,136 ) $ (1,239 ) Net amount recognized $ (1,136 ) $ (1,239 ) Amounts recognized in accumulated other comprehensive income at December 31: Net actuarial loss $ 538 $ 646 Total $ 538 $ 646
Schedule of Net Periodic Benefit Cost	The net periodic benefit cost and its components were as follows for the years ended December 31: (dollars in thousands) 2016 2015 2014 Net Periodic Benefit Cost Interest cost $ 52 $ 45 $ 52 Recognized actuarial loss 108 122 102 Net periodic benefit cost $ 160 $ 167 $ 154 Settlement loss 103 — — Total net periodic benefit cost $ 263 $ 167 $ 154 Other Changes in Benefit Obligations Recognized in Other Comprehensive Income Net actuarial (gain)/loss $ 103 $ (87 ) $ 145 Amortization of net actuarial loss (108 ) (122 ) (102 ) Settlement loss (103 ) — — Total recognized in other comprehensive income $ (108 ) $ (209 ) $ 43 Total recognized in net periodic benefit cost and other comprehensive income $ 155 $ (42 ) $ 197
Schedule of Assumptions Used in Determining the Benefit Obligation and Net Periodic Benefit Cost	The weighted-average assumptions used to determine the benefit obligation as of the end of the years indicated and the net periodic benefit cost for the years indicated are presented in the table below. Because the plan is frozen, increases in compensation are not considered. 2016 2015 2014 Benefit obligations: Discount rate at the end of the period 4.00 % 4.50 % 4.00 % Net periodic benefit cost: Discount rate at the beginning of the period 4.50 % 4.00 % 4.75 % Rate of compensation increase N/A N/A N/A N/A = not applicable
Schedule of Expected Benefit Payments	As of December 31, 2015, expected future benefit payments related to Old National’s Restoration Plan were as follows: (dollars in thousands) 2017 $ 210 2018 18 2019 230 2020 21 2021 52 Years 2022 - 2026 610

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Changes in Nonvested Restricted Stock Awards	A summary of changes in our nonvested shares for the year follows: (shares in thousands) Shares Weighted Average Grant-Date Fair Value Nonvested balance at January 1, 2016 346 $ 13.90 Granted during the year (1) 348 12.77 Vested during the year (289 ) 13.36 Forfeited during the year (4 ) 13.26 Nonvested balance at December 31, 2016 401 $ 13.31 (1) Includes 173 thousand shares assumed in conjunction with the acquisition of Anchor in May 2016.
Summary of Changes in Nonvested Restricted Shares	A summary of changes in our nonvested shares for the year follows: (shares in thousands) Shares Weighted Average Grant-Date Fair Value Nonvested balance at January 1, 2016 840 $ 12.56 Granted during the year 279 10.17 Vested during the year (16 ) 13.04 Forfeited during the year (295 ) 11.84 Dividend equivalents adjustment 13 11.05 Nonvested balance at December 31, 2016 821 $ 12.02
Summary of Activity in Stock Option Plan	A summary of the activity in the stock option plan in 2016 follows: (shares in thousands) Shares Weighted Weighted Aggregate Outstanding at January 1, 2016 1,043 $ 16.16 Exercised (191 ) 12.83 Forfeited/expired (158 ) 24.09 Outstanding at December 31, 2015 694 $ 15.27 1.33 $ 2,460.1 Options exercisable at end of year 694 $ 15.27 1.33 $ 2,460.1
Schedule of Information Related to Stock Option Plan	Information related to the stock option plan during each year follows: (dollars in thousands) 2016 2015 2014 Intrinsic value of options exercised $ 660 $ 458 $ 432 Cash received from option exercises 2,349 997 1,002 Tax benefit realized from option exercises 264 159 97

Fair Value (Tables)

Fair Value (Tables)	12 Months Ended
	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis	Assets and liabilities measured at fair value on a recurring basis, including financial assets and liabilities for which we have elected the fair value option, are summarized below: Fair Value Measurements at December 31, 2016 Using (dollars in thousands) Carrying Quoted Prices in Significant Significant (Level 3) Financial Assets Trading securities $ 4,982 $ 4,982 $ — $ — Investment securities available-for-sale: U.S. Treasury 7,103 7,103 — — U.S. government-sponsored entities and agencies 493,956 — 493,956 — Mortgage-backed securities - Agency 1,525,019 — 1,525,019 — States and political subdivisions 436,684 — 436,684 Pooled trust preferred securities 8,119 — — 8,119 Other securities 326,293 30,905 295,388 — Residential loans held for sale 90,682 — 90,682 — Derivative assets 17,701 — 17,701 — Financial Liabilities Derivative liabilities 23,574 — 23,574 — Fair Value Measurements at December 31, 2015 Using (dollars in thousands) Carrying Quoted Prices in Significant Significant (Level 3) Financial Assets Trading securities $ 3,941 $ 3,941 $ — $ — Investment securities available-for-sale: U.S. Treasury 12,150 12,150 — — U.S. government-sponsored entities and agencies 613,550 — 613,550 — Mortgage-backed securities - Agency 1,066,361 — 1,066,361 — States and political subdivisions 387,296 — 387,296 — Pooled trust preferred securities 7,900 — — 7,900 Other securities 330,964 31,443 299,521 — Residential loans held for sale 13,810 — 13,810 — Derivative assets 15,925 — 15,925 — Financial Liabilities Derivative liabilities 26,968 — 26,968 —
Reconciliation of All Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3)	The table below presents a reconciliation of all assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the year ended December 31, 2016: (dollars in thousands) Pooled Trust Available-for-Sale Balance at January 1, 2016 $ 7,900 Accretion of discount 18 Sales/payments received (327 ) Increase in fair value of securities 528 Balance at December 31, 2016 $ 8,119 The table below presents a reconciliation of all assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the year ended December 31, 2015: (dollars in thousands) Pooled Trust Available-for-Sale State and Balance at January 1, 2015 $ 6,607 $ 325 Accretion of discount 18 — Sales/payments received (663 ) — Matured securities — (325 ) Increase in fair value of securities 1,938 — Balance at December 31, 2015 $ 7,900 $ —
Quantitative Information about Significant Unobservable Inputs Used in Fair Value Measurements	The tables below provide quantitative information about significant unobservable inputs used in fair value measurements within Level 3 of the fair value hierarchy: (dollars in thousands) Fair Value at Valuation Techniques Unobservable Input Range (Weighted Pooled trust preferred securities $ 8,119 Discounted cash flow Constant prepayment rate (a) 0.00% Additional asset defaults (b) 4.5% - 10.0% (7.9%) Expected asset recoveries (c) 0.0% - 6.1% (0.9%) (a) Assuming no prepayments. (b) Each currently performing pool asset is assigned a default probability based on the banking environment, which is adjusted for specific issuer evaluation, of 0%, 50% or 100%. (c) Each currently defaulted pool asset is assigned a recovery probability based on specific issuer evaluation of 0%, 25% or 100%. (dollars in thousands) Fair Value at Valuation Techniques Unobservable Input Range (Weighted Pooled trust preferred securities $ 7,900 Discounted cash flow Constant prepayment rate (a) 0.00% Additional asset defaults (b) 4.1% - 11.5% (8.1%) Expected asset recoveries (c) 0.0% - 11.5% (3.1%) (a) Assuming no prepayments. (b) Each currently performing pool asset is assigned a default probability based on the banking environment, which is adjusted for specific issuer evaluation, of 0%, 50%, or 100%. (c) Each currently defaulted pool asset is assigned a recovery probability based on specific issuer evaluation of 0%, 25%, or 100%. The tables below provide quantitative information about significant unobservable inputs used in fair value measurements within Level 3 of the fair value hierarchy: (dollars in thousands) Fair Value at Valuation Unobservable Range (Weighted Collateral Dependent Impaired Loans Commercial loans $ 6,771 Fair value of Discount for type of property, age of appraisal and current status 0% - 99% (53%) Commercial real estate loans 11,632 Fair value of Discount for type of property, age of appraisal and current status 10% - 67% (36%) Foreclosed Assets Commercial real estate 1,352 Fair value of Discount for type of property, age of appraisal and current status 4% - 80% (39%) Residential 394 Fair value of Discount for type of property, age of appraisal and current status 7% - 60% (30%) (dollars in thousands) Fair Value at Valuation Unobservable Range (Weighted Collateral Dependent Impaired Loans Commercial loans $ 13,332 Fair value of Discount for type of property, age of appraisal, and current status 0% - 86% (28%) Commercial real estate loans 11,857 Fair value of Discount for type of property, age of appraisal, and current status 0% - 61% (33%) Foreclosed Assets Commercial real estate 2,526 Fair value of Discount for type of property, age of appraisal, and current status 3% - 80% (26%) Residential 203 Fair value of Discount for type of property, age of appraisal, and current status 7% - 53% (29%)
Assets Measured at Fair Value on a Non-Recurring Basis	Assets measured at fair value on a non-recurring Fair Value Measurements at December 31, 2016 Using (dollars in thousands) Carrying Quoted Prices in Significant Significant (Level 3) Collateral Dependent Impaired Loans Commercial loans $ 6,771 $ — $ — $ 6,771 Commercial real estate loans 11,632 — — 11,632 Foreclosed Assets Commercial real estate 1,352 — — 1,352 Residential 394 — — 394 Assets measured at fair value on a non-recurring Fair Value Measurements at December 31, 2015 Using (dollars in thousands) Carrying Quoted Prices in Significant Significant Collateral Dependent Impaired Loans Commercial loans $ 13,332 $ — $ — $ 13,332 Commercial real estate loans 11,857 — — 11,857 Foreclosed Assets Commercial real estate 2,526 — — 2,526 Residential 203 — — 203
Schedule of Difference Between the Aggregate Fair Value and the Aggregate Remaining Principal Balance	dollars in thousands) Aggregate Difference Contractual 2016 Residential loans held for sale $ 90,682 $ 133 $ 90,549 2015 Residential loans held for sale $ 13,810 $ 236 $ 13,574 Accrued interest at period end is included in the fair value of the instruments. The following table presents the amount of gains and losses from fair value changes included in income before income taxes for financial assets carried at fair value for the years ended December 31: (dollars in thousands) Other Gains and (Losses) Interest Income Interest (Expense) Total Changes in Fair Values Included in Current Period Earnings 2016 Residential loans held for sale $ (103 ) $ — $ — $ (103 ) 2015 Residential loans held for sale $ (140 ) $ — $ — $ (140 )
Carrying Amounts and Estimated Fair Values of Financial Instruments, Not Previously Presented	The carrying amounts and estimated fair values of financial instruments, not previously presented in this note, at December 31, 2016 and 2015 were as follows: Fair Value Measurements at December 31, 2016 Using (dollars in thousands) Carrying 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, due from banks, federal funds sold, and money market investments $ 255,519 $ 255,519 $ — $ — Investment securities held-to-maturity: U.S. government-sponsored entities and agencies 40,131 — 40,558 — Mortgage-backed securities—Agency 10,640 — 10,940 — State and political subdivisions 694,319 — 732,674 — Federal Home Loan Bank/Federal Reserve Bank stock 101,716 N/A N/A N/A Loans, net: Commercial 1,895,618 — — 1,971,296 Commercial real estate 3,112,680 — — 3,400,365 Residential real estate 2,085,887 — — 2,228,542 Consumer credit 1,866,519 — — 1,974,180 Accrued interest receivable 81,381 16 22,880 58,485 Financial Liabilities Deposits: Noninterest-bearing demand deposits $ 3,016,093 $ 3,016,093 $ — $ — NOW, savings, and money market deposits 6,259,052 6,259,052 — — Time deposits 1,468,108 — 1,460,778 — Federal funds purchased and interbank borrowings 213,003 213,003 Securities sold under agreements to repurchase 367,052 317,052 50,612 — Federal Home Loan Bank advances 1,353,092 — — 1,360,599 Other borrowings 218,939 — 217,647 — Accrued interest payable 5,979 — 5,979 — Standby letters of credit 315 — — 315 Off-Balance Commitments to extend credit $ — $ — $ — $ 2,527 N/A = not applicable Carrying Fair Value Measurements at December 31, 2015 Using (dollars in thousands) Quoted Prices in Significant Significant (Level 3) Financial Assets Cash, due from banks, federal funds sold, and money market investments $ 219,818 $ 219,818 $ — $ — Investment securities held-to-maturity: U.S. government-sponsored entities and agencies 142,864 — 145,763 — Mortgage-backed securities - Agency 16,042 — 16,604 — State and political subdivisions 713,205 — 767,050 — Federal Home Loan Bank/Federal Reserve Bank stock 86,146 N/A N/A N/A Loans, net (including covered loans): Commercial 1,788,593 — — 1,829,824 Commercial real estate 1,852,979 — — 1,946,163 Residential real estate 1,659,284 — — 1,745,248 Consumer credit 1,595,316 — — 1,587,879 FDIC indemnification asset 9,030 — — 5,700 Accrued interest receivable 69,098 29 22,821 46,248 Financial Liabilities Deposits: Noninterest-bearing demand deposits $ 2,488,855 $ 2,488,855 $ — $ — NOW, savings, and money market deposits 4,911,938 4,911,938 — — Time deposits 1,000,067 — 998,878 — Federal funds purchased and interbank borrowings 291,090 291,090 — — Securities sold under agreements to repurchase 387,409 337,409 51,370 — Federal Home Loan Bank advances 1,023,491 — — 1,029,779 Other borrowings 218,256 — 201,138 — Accrued interest payable 4,859 — 4,859 — Standby letters of credit 429 — — 429 Off-Balance Commitments to extend credit $ — $ — $ — $ 2,364 N/A = not applicable

Derivative Financial Instrume57

Derivative Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Fair Value of Derivative Financial Instruments	The following table summarizes the fair value of derivative financial instruments utilized by Old National: December 31, 2016 December 31, 2015 (dollars in thousands) Asset Liability Asset Liability Derivatives Derivatives designated as hedging instruments Interest rate contracts $ 3,056 $ 11,582 $ 3,794 $ 15,554 Total derivatives designated as hedging instruments $ 3,056 $ 11,582 $ 3,794 $ 15,554 Derivatives not designated as hedging instruments Interest rate contracts $ 11,903 $ 11,992 $ 11,296 $ 11,414 Mortgage contracts 2,742 — 835 — Total derivatives not designated as hedging instruments $ 14,645 $ 11,992 $ 12,131 $ 11,414 Total $ 17,701 $ 23,574 $ 15,925 $ 26,968
Schedule of Effect of Derivative Instruments on the Consolidated Statements of Income	The effect of derivative instruments on the consolidated statements of income for the years ended December 31 were as follows: (dollars in thousands) 2016 2015 2014 Derivatives in Fair Value Hedging Relationships Location of Gain or (Loss) Recognized in Income on Derivative Amount of Gain or (Loss) Interest rate contracts (1) Interest income / (expense) $ (5,446 ) $ (1,729 ) $ 1,002 Interest rate contracts (2) Other income / (expense) 126 189 275 Total $ (5,320 ) $ (1,540 ) $ 1,277 Derivatives in Cash Flow Hedging Relationships Location of Gain or (Loss) Recognized in Income on Derivative Amount of Gain or (Loss) Interest rate contracts (1) Interest income / (expense) $ 329 $ 511 $ 246 Total $ 329 $ 511 $ 246 Derivatives Not Designated as Hedging Instruments Location of Gain or (Loss) Recognized in Income on Derivative Amount of Gain or (Loss) Interest rate contracts (3) Other income / (expense) $ 28 $ 18 $ 88 Mortgage contracts Mortgage banking revenue 1,390 168 252 Total $ 1,418 $ 186 $ 340 (1) Amounts represent the net interest payments as stated in the contractual agreements. (2) Amounts represent ineffectiveness on derivatives designated as fair value hedges. (3) Includes the valuation differences between the customer and offsetting counterparty swaps.

Regulatory Restrictions (Tables

Regulatory Restrictions (Tables)	12 Months Ended
	Dec. 31, 2016
Text Block [Abstract]
Schedule of Capital Ratios	The following table summarizes capital ratios for Old National and Old National Bank as of December 31: Fully Phased-In Regulatory Well Capitalized Actual Guidelines Minimum (1) Guidelines (dollars in thousands) Amount Ratio Amount Ratio Amount Ratio 2016 Total capital to risk- weighted assets Old National Bancorp $ 1,229,878 12.18 % $ 1,060,662 10.50 % $ N/A N/A % Old National Bank 1,240,180 12.35 1,054,305 10.50 1,004,100 10.00 Common equity Tier 1 capital to risk-weighted assets Old National Bancorp 1,162,817 11.51 707,108 7.00 N/A N/A Old National Bank 1,187,151 11.82 702,870 7.00 652,665 6.50 Tier 1 capital to risk- weighted assets Old National Bancorp 1,176,849 11.65 858,631 8.50 N/A N/A Old National Bank 1,187,151 11.82 853,485 8.50 803,280 8.00 Tier 1 capital to average assets Old National Bancorp 1,176,849 8.43 558,673 4.00 N/A N/A Old National Bank 1,187,151 8.55 555,161 4.00 693,951 5.00 2015 Total capital to risk- weighted assets Old National Bancorp $ 1,024,586 13.28 % $ 810,397 10.50 % $ N/A N/A % Old National Bank 1,079,652 14.11 803,490 10.50 765,229 10.00 Common equity Tier 1 capital to risk-weighted assets Old National Bancorp 934,497 12.11 540,265 7.00 N/A N/A Old National Bank 1,023,839 13.38 535,660 7.00 497,399 6.50 Tier 1 capital to risk- weighted assets Old National Bancorp 968,772 12.55 656,036 8.50 N/A N/A Old National Bank 1,023,839 13.38 650,445 8.50 612,183 8.00 Tier 1 capital to average assets Old National Bancorp 968,772 8.54 454,005 4.00 N/A N/A Old National Bank 1,023,839 9.11 449,791 4.00 562,239 5.00 N/A = not applicable (1) When fully phased-in

Parent Company Financial Stat59

Parent Company Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2016
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Balance Sheets	OLD NATIONAL BANCORP (PARENT COMPANY ONLY) CONDENSED BALANCE SHEETS December 31, (dollars in thousands) 2016 2015 Assets Deposits in affiliate bank $ 91,650 $ 48,000 Trading securities - at fair value 4,982 3,941 Investment securities - available-for-sale 1,535 1,452 Investment in affiliates: Banking subsidiaries 1,862,244 1,551,924 Non-banks 11,388 49,083 Other assets 90,872 84,598 Total assets $ 2,062,671 $ 1,738,998 Liabilities and Shareholders’ Equity Other liabilities $ 33,407 $ 33,608 Other borrowings 214,847 214,220 Shareholders’ equity 1,814,417 1,491,170 Total liabilities and shareholders’ equity $ 2,062,671 $ 1,738,998
Condensed Statements of Income	OLD NATIONAL BANCORP (PARENT COMPANY ONLY) CONDENSED STATEMENTS OF INCOME Years Ended December 31, (dollars in thousands) 2016 2015 2014 Income Dividends from affiliates $ 160,007 $ 67,717 $ 65,292 Net securities gains 100 6 170 Other income 40,841 1,892 1,554 Other income from affiliates 6 51 79 Total income 200,954 69,666 67,095 Expense Interest on borrowings 9,077 8,684 3,837 Other expenses 18,460 13,957 11,357 Total expense 27,537 22,641 15,194 Income before income taxes and equity in undistributed earnings of affiliates 173,417 47,025 51,901 Income tax expense (benefit) 11,952 (5,473 ) (4,020 ) Income before equity in undistributed earnings of affiliates 161,465 52,498 55,921 Equity in undistributed earnings of affiliates (27,201 ) 64,218 47,746 Net income $ 134,264 $ 116,716 $ 103,667
Condensed Statement of Cash Flows	OLD NATIONAL BANCORP (PARENT COMPANY ONLY) CONDENSED STATEMENT OF CASH FLOWS Years Ended December 31, (dollars in thousands) 2016 2015 2014 Cash Flows From Operating Activities Net income $ 134,264 $ 116,716 $ 103,667 Adjustments to reconcile net income to cash provided by operating activities: Depreciation 29 20 11 Net securities gains (100 ) (6 ) (270 ) Gain on sale of ONB Insurance Group, Inc. (41,864 ) — — Stock compensation expense 7,318 4,255 4,162 (Increase) decrease in other assets (3,958 ) 6,307 20,040 Increase (decrease) in other liabilities (225 ) 1,441 286 Equity in undistributed earnings of affiliates 27,201 (64,218 ) (47,746 ) Total adjustments (11,599 ) (52,201 ) (23,517 ) Net cash flows provided by operating activities 122,665 64,515 80,150 Cash Flows From Investing Activities Net cash and cash equivalents of acquisitions (100,220 ) (41,070 ) (82,975 ) Proceeds from sale of ONB Insurance Group, Inc. 91,771 — — Purchases of investment securities (52 ) (1,053 ) (45 ) Net advances to affiliates (3,500 ) — (3,832 ) Purchases of premises and equipment (13 ) — (1,032 ) Net cash flows used in investing activities (12,014 ) (42,123 ) (87,884 ) Cash Flows From Financing Activities Proceeds from issuance of other borrowings — — 173,500 Cash dividends paid on common stock (67,536 ) (55,552 ) (48,181 ) Common stock repurchased (2,202 ) (88,695 ) (25,830 ) Proceeds from exercise of stock options, including tax benefit 2,349 997 749 Common stock issued 388 391 326 Net cash flows provided by (used in) financing activities (67,001 ) (142,859 ) 100,564 Net increase (decrease) in cash and cash equivalents 43,650 (120,467 ) 92,830 Cash and cash equivalents at beginning of period 48,000 168,467 75,637 Cash and cash equivalents at end of period $ 91,650 $ 48,000 $ 168,467

Interim Financial Data (Unaud60

Interim Financial Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Interim Financial Data	The following table details the quarterly results of operations for the years ended December 31, 2016 and 2015. (unaudited, dollars and shares in thousands, except per share data) Three Months Ended Three Months Ended 12/31/2016 9/30/2016 6/30/2016 3/31/2016 12/31/2015 9/30/2015 6/30/2015 3/31/2015 Interest income $ 121,849 $ 119,713 $ 110,243 $ 95,329 $ 94,960 $ 105,671 $ 99,964 $ 98,594 Interest expense 11,932 11,910 10,903 9,686 9,038 8,567 7,867 7,601 Net interest income 109,917 107,803 99,340 85,643 85,922 97,104 92,097 90,993 Provision for loan losses (1,756 ) 1,306 1,319 91 484 167 2,271 1 Noninterest income 62,751 47,243 93,385 49,451 60,614 59,744 54,979 55,295 Noninterest expense 126,258 108,062 121,472 98,355 102,469 102,617 109,690 116,156 Income before income taxes 48,166 45,678 69,934 36,648 43,583 54,064 35,115 30,131 Income tax expense 14,710 10,969 30,812 9,671 11,598 16,395 8,959 9,225 Net income $ 33,456 $ 34,709 $ 39,122 $ 26,977 $ 31,985 $ 37,669 $ 26,156 $ 20,906 Net income per share: Basic $ 0.25 $ 0.25 $ 0.31 $ 0.24 $ 0.28 $ 0.33 $ 0.22 $ 0.18 Diluted 0.25 0.25 0.31 0.24 0.27 0.33 0.22 0.18 Average shares: Basic 134,670 134,492 127,508 113,998 114,103 114,590 115,732 118,540 Diluted 135,383 135,011 127,973 114,563 114,716 115,153 116,223 119,076

Basis of Presentation and Sig61

Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Basis Of Presentation And Significant Accounting Policies [Line Items]
Loan placed on nonaccrual when past due, number of days									90 days
Days delinquent required for charge off									90 days
Company-owned life insurance	$ 352,956,000				$ 341,294,000				$ 352,956,000	$ 341,294,000
Amount of foreclosed assets	18,500,000				12,500,000				$ 18,500,000	12,500,000
Accrued interest coverage by FDIC, number of days									90 days
Percentage of income tax examination likelihood of tax benefits									50.00%
Tax benefit recorded	14,710,000	$ 10,969,000	$ 30,812,000	$ 9,671,000	$ 11,598,000	$ 16,395,000	$ 8,959,000	$ 9,225,000	$ 66,162,000	$ 46,177,000	$ 38,297,000
Maximum [Member]
Basis Of Presentation And Significant Accounting Policies [Line Items]
Value of small commercial loans on nonaccrual status or 90 days or more delinquent									$ 250,000
Maturity of short-term securities sold under agreements to repurchase									4 days
Maximum [Member] | Accounting Standards Update 2016-02 [Member]
Basis Of Presentation And Significant Accounting Policies [Line Items]
Anticipated increase in assets and liabilities									$ 100,000,000
Maximum [Member] | Other Intangible Assets [Member]
Basis Of Presentation And Significant Accounting Policies [Line Items]
Estimated useful lives of core deposits and customer relationships									15 years
Minimum [Member]
Basis Of Presentation And Significant Accounting Policies [Line Items]
Maturity of short-term securities sold under agreements to repurchase									1 day
Minimum [Member] | Accounting Standards Update 2016-02 [Member]
Basis Of Presentation And Significant Accounting Policies [Line Items]
Anticipated increase in assets and liabilities									$ 80,000,000
Minimum [Member] | Other Intangible Assets [Member]
Basis Of Presentation And Significant Accounting Policies [Line Items]
Estimated useful lives of core deposits and customer relationships									5 years
Expenses up to $275.0 [Member]
Basis Of Presentation And Significant Accounting Policies [Line Items]
Expenses sharing reimbursement threshold									80.00%
Loss amount covered at 80% up to $275 million	$ 275,000,000								$ 275,000,000
Building and Building Improvements [Member] | Maximum [Member]
Basis Of Presentation And Significant Accounting Policies [Line Items]
Useful lives for premises and equipment, years									39 years
Building and Building Improvements [Member] | Minimum [Member]
Basis Of Presentation And Significant Accounting Policies [Line Items]
Useful lives for premises and equipment, years									15 years
Furniture and Equipment [Member] | Maximum [Member]
Basis Of Presentation And Significant Accounting Policies [Line Items]
Useful lives for premises and equipment, years									10 years
Furniture and Equipment [Member] | Minimum [Member]
Basis Of Presentation And Significant Accounting Policies [Line Items]
Useful lives for premises and equipment, years									3 years

Basis of Presentation and Sig62

Basis of Presentation and Significant Accounting Policies - Summary of Table Reconciling Basic and Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share [Abstract]
Net income	$ 33,456	$ 34,709	$ 39,122	$ 26,977	$ 31,985	$ 37,669	$ 26,156	$ 20,906	$ 134,264	$ 116,716	$ 103,667
Basic Earnings Per Share, Weighted average common shares outstanding									127,705	115,726	107,818
Basic Earnings Per Share	$ 0.25	$ 0.25	$ 0.31	$ 0.24	$ 0.28	$ 0.33	$ 0.22	$ 0.18	$ 1.05	$ 1.01	$ 0.96
Net income	$ 33,456	$ 34,709	$ 39,122	$ 26,977	$ 31,985	$ 37,669	$ 26,156	$ 20,906	$ 134,264	$ 116,716	$ 103,667
Diluted Earnings Per Share, Weighted average common shares outstanding									127,705	115,726	107,818
Effect of dilutive securities: Restricted stock									543	440	488
Effect of dilutive securities: Stock options									53	89	59
Diluted Earnings Per Share, Weighted average shares outstanding	135,383	135,011	127,973	114,563	114,716	115,153	116,223	119,076	128,301	116,255	108,365
Diluted Earnings Per Share	$ 0.25	$ 0.25	$ 0.31	$ 0.24	$ 0.27	$ 0.33	$ 0.22	$ 0.18	$ 1.05	$ 1	$ 0.95

Basis of Presentation and Sig63

Basis of Presentation and Significant Accounting Policies - Summary of Table Reconciling Basic and Diluted Net Income Per Share (Parenthetical) (Detail) - shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restricted Stock [Member]
Summary Of Computation Of Basic And Diluted Earnings Per Share [Line Items]
Antidilutive securities not included in the computation of net income per diluted share	3,000	0	0
Stock Options [Member]
Summary Of Computation Of Basic And Diluted Earnings Per Share [Line Items]
Antidilutive securities not included in the computation of net income per diluted share	500,000	700,000	1,000,000

Basis of Presentation and Sig64

Basis of Presentation and Significant Accounting Policies - Summary of Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash payments:
Interest	$ 43,698	$ 32,712	$ 21,005
Income taxes (net of refunds)	23,636	14,824	18,820
Noncash Investing and Financing Activities:
Transfer of loans held for investment to loans held for sale			197,928
Transfer of premises and equipment to assets held for sale	$ 4,620	$ 9,070	$ 3,042

Basis of Presentation and Sig65

Basis of Presentation and Significant Accounting Policies - Summary of Common Shares Issued and Resultant Value of Total Shareholders' Equity (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Anchor BanCorp Wisconsin Inc [Member]
Common Shares Issued and Value of Shares Holders' Equity [Line Items]
Acquisition	$ 273,565
Anchor BanCorp Wisconsin Inc [Member] | Common Stock [Member]
Common Shares Issued and Value of Shares Holders' Equity [Line Items]
Acquisition	$ 20,415
Founders Financial Corporation [Member]
Common Shares Issued and Value of Shares Holders' Equity [Line Items]
Acquisition		$ 50,626
Founders Financial Corporation [Member] | Common Stock [Member]
Common Shares Issued and Value of Shares Holders' Equity [Line Items]
Acquisition		$ 3,402
Tower Financial Corporation [Member]
Common Shares Issued and Value of Shares Holders' Equity [Line Items]
Acquisition			$ 78,727
Tower Financial Corporation [Member] | Common Stock [Member]
Common Shares Issued and Value of Shares Holders' Equity [Line Items]
Acquisition			5,626
United Bancorp, Inc. [Member]
Common Shares Issued and Value of Shares Holders' Equity [Line Items]
Acquisition			123,806
United Bancorp, Inc. [Member] | Common Stock [Member]
Common Shares Issued and Value of Shares Holders' Equity [Line Items]
Acquisition			9,117
LSB Financial Corp. [Member]
Common Shares Issued and Value of Shares Holders' Equity [Line Items]
Acquisition			51,758
LSB Financial Corp. [Member] | Common Stock [Member]
Common Shares Issued and Value of Shares Holders' Equity [Line Items]
Acquisition			$ 3,557

Acquisition and Divestiture A66

Acquisition and Divestiture Activity - Additional Information (Detail) $ / shares in Units, $ in Thousands, shares in Millions

Jan. 12, 2016BankingCenters

Aug. 14, 2015USD ($)Branches

May 08, 2015USD ($)

Feb. 01, 2015USD ($)

Nov. 01, 2014BankingCenters

Jan. 31, 2017Branch

May 31, 2016USD ($)

Dec. 31, 2016USD ($)Branch$ / sharesshares

Dec. 31, 2015USD ($)Branch

Jan. 01, 2015Branch

Dec. 31, 2014USD ($)

Jul. 31, 2014Branch

Jun. 30, 2014USD ($)Branch

Apr. 25, 2014USD ($)Branch

Business Acquisition [Line Items]

Goodwill acquired during the period

$ 111,347

$ 57,619

Purchasers assumed loans

$ 193,600

Other transaction expense related to divestitures

900

Deposits

$ 555,800

Net pre-tax gain

15,627

Goodwill allocation

$ 655,018

$ 584,634

$ 530,845

Number of banking centers consolidated | Branch

5

23

Cash received in acquisition

$ 91,771

Goodwill and intangible assets eliminated

41,000

Acquisition-related Costs [Member]

Business Acquisition [Line Items]

Acquisition related costs incurred

15,900

ONB Insurance Group, Inc. [Member]

Business Acquisition [Line Items]

Cash received in acquisition

$ 91,800

Gain on sale of assets before tax

41,900

Gain on sale of assets after tax

17,600

Goodwill and intangible assets eliminated

$ 47,500

Subsequent Event [Member]

Business Acquisition [Line Items]

Number of banking centers consolidated | Branch

15

Southern Illinois [Member]

Business Acquisition [Line Items]

Number of banking centers | Branches

12

Eastern Indiana [Member]

Business Acquisition [Line Items]

Number of banking centers | Branches

4

Ohio [Member]

Business Acquisition [Line Items]

Number of banking centers | Branches

1

Southern Illinois Franchise [Member]

Business Acquisition [Line Items]

Net pre-tax gain

$ 15,600

Deposit premium

19,300

Goodwill allocation

$ 3,800

Tower Financial Corporation [Member]

Business Acquisition [Line Items]

Number of branch locations | Branch

7

Additional assets under management

$ 556,000

Total purchase price of acquisition

110,400

Purchase price of acquisition, cash

$ 31,700

Issuance of common stock shares for acquisitions of business | shares

5.6

Value of issuance common stock shares

$ 78,700

Transaction and integration costs associated with the acquisition

5,600

Goodwill allocation

$ 56,203

Tower Financial Corporation [Member] | Core Deposit [Member]

Business Acquisition [Line Items]

Estimated useful life of acquired identifiable intangible assets

7 years

Definite-lived intangible assets acquired

$ 4,600

United Bancorp, Inc. [Member]

Business Acquisition [Line Items]

Additional assets under management

$ 688,000

Total purchase price of acquisition

157,800

Purchase price of acquisition, cash

$ 34,000

Issuance of common stock shares for acquisitions of business | shares

9.1

Transaction and integration costs associated with the acquisition

$ 7,600

Goodwill allocation

81,952

United Bancorp, Inc. [Member] | Common Stock [Member]

Business Acquisition [Line Items]

Value of issuance common stock shares

122,000

United Bancorp, Inc. [Member] | Options and Stock Appreciation Rights [Member]

Business Acquisition [Line Items]

Value of issuance common stock shares

$ 1,800

United Bancorp, Inc. [Member] | Core Deposit [Member]

Business Acquisition [Line Items]

Estimated useful life of acquired identifiable intangible assets

7 years

Definite-lived intangible assets acquired

$ 5,900

United Bancorp, Inc. [Member] | Michigan [Member]

Business Acquisition [Line Items]

Number of branch locations | Branch

36

18

LSB Financial Corp. [Member]

Business Acquisition [Line Items]

Total purchase price of acquisition

69,600

Purchase price of acquisition, cash

$ 17,800

Issuance of common stock shares for acquisitions of business | shares

3.6

Transaction and integration costs associated with the acquisition

$ 3,200

Number of banking centers | BankingCenters

5

Goodwill allocation

40,476

LSB Financial Corp. [Member] | Common Stock [Member]

Business Acquisition [Line Items]

Value of issuance common stock shares

$ 51,800

LSB Financial Corp. [Member] | Core Deposit [Member]

Business Acquisition [Line Items]

Estimated useful life of acquired identifiable intangible assets

7 years

Definite-lived intangible assets acquired

$ 2,600

Founders Financial Corporation [Member]

Business Acquisition [Line Items]

Number of branch locations | Branch

4

Total purchase price of acquisition

91,700

Purchase price of acquisition, cash

$ 41,000

Issuance of common stock shares for acquisitions of business | shares

3.4

Value of issuance common stock shares

$ 50,600

Transaction and integration costs associated with the acquisition

$ 4,900

Effective date of acquisition

Jan. 1, 2015

Goodwill allocation

$ 56,014

Founders Financial Corporation [Member] | Core Deposit [Member]

Business Acquisition [Line Items]

Estimated useful life of acquired identifiable intangible assets

7 years

Definite-lived intangible assets acquired

$ 2,900

Anchor BanCorp Wisconsin Inc [Member]

Business Acquisition [Line Items]

Total purchase price of acquisition

459,800

Purchase price of acquisition, cash

$ 186,200

Issuance of common stock shares for acquisitions of business | shares

20.4

Value of issuance common stock shares

$ 273,600

Transaction and integration costs associated with the acquisition

$ 15,900

Number of banking centers | BankingCenters

46

Acquisition agreement date

Jan. 12, 2016

Effective date of acquisition

May 1, 2016

Portion of share received by merged entity

3.5505

Consideration received in cash by merged entity | $ / shares

$ 48.50

Goodwill acquired during the period

$ 111,300

Goodwill allocation

$ 111,347

Anchor BanCorp Wisconsin Inc [Member] | Maximum [Member]

Business Acquisition [Line Items]

Maximum percentage of purchase price in cash

40.00%

Anchor BanCorp Wisconsin Inc [Member] | Core Deposit [Member]

Business Acquisition [Line Items]

Estimated useful life of acquired identifiable intangible assets

7 years

Definite-lived intangible assets acquired

$ 21,600

Increase (decrease) in intangible assets

$ 21,600

Anchor BanCorp Wisconsin Inc [Member] | Madison Milwaukee and Fox Valley Triangle [Member]

Business Acquisition [Line Items]

Number of banking centers | BankingCenters

32

Mutual Underwriters [Member]

Business Acquisition [Line Items]

Total purchase price of acquisition

$ 3,700

Mutual Underwriters [Member] | Insurance [Member]

Business Acquisition [Line Items]

Goodwill acquired during the period

1,100

Mutual Underwriters [Member] | Customer Business Relationships [Member]

Business Acquisition [Line Items]

Estimated useful life of intangible assets

10 years

Mutual Underwriters [Member] | Customer Business Relationships [Member] | Insurance [Member]

Business Acquisition [Line Items]

Customer business relationship intangibles acquired

$ 2,600

Insurance Book of Business [Member] | Insurance [Member]

Business Acquisition [Line Items]

Purchase price of acquisition, cash

$ 100

Additional consideration upon operation targets

100

Insurance Book of Business [Member] | Customer Business Relationships [Member] | Insurance [Member]

Business Acquisition [Line Items]

Estimated useful life of intangible assets

10 years

Increase (decrease) in intangible assets

$ 200

Acquisition and Divestiture A67

Acquisition and Divestiture Activity - Schedule of Purchase Price Allocation (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Deposits	$ (10,743,253)	$ (8,400,860)
Securities sold under agreements to repurchase	(367,052)	(387,409)
Federal funds purchased	(213,003)	(291,090)
Federal Home Loan Bank advances	(1,353,092)	(1,023,491)
Goodwill	655,018	$ 584,634	$ 530,845
Tower Financial Corporation [Member]
Business Acquisition [Line Items]
Cash and cash equivalents	56,345
Investment securities	140,567
Federal Home Loan Bank stock	2,192
Loans held for sale	474
Loans	371,054
Premises and equipment	8,516
Accrued interest receivable	2,371
Other real estate owned	473
Company-owned life insurance	21,281
Other assets	15,200
Deposits	(527,995)
Securities sold under agreements to repurchase	(18,898)
Federal Home Loan Bank advances	(5,500)
Other borrowings	(15,613)
Accrued expenses and other liabilities	(4,681)
Net tangible assets acquired	45,786
Definite-lived intangible assets acquired	8,382
Goodwill	56,203
Purchase price	110,371
Anchor BanCorp Wisconsin Inc [Member]
Business Acquisition [Line Items]
Cash and cash equivalents	123,657
Investment securities	235,240
Federal Home Loan Bank stock	4,596
Loans held for sale	9,334
Loans	1,637,806
Premises and equipment	35,721
Accrued interest receivable	7,308
Other real estate owned	17,349
Company-owned life insurance	7,278
Other assets	126,210
Deposits	(1,852,713)
Securities sold under agreements to repurchase	(3,132)
Other borrowings	(123)
Accrued expenses and other liabilities	(36,957)
Net tangible assets acquired	311,574
Definite-lived intangible assets acquired	21,559
Loan servicing rights	15,274
Goodwill	111,347
Purchase price	459,754
United Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Cash and cash equivalents	16,447
Investment securities	154,885
Federal Home Loan Bank stock	2,880
Loans held for sale	1,073
Loans	632,016
Premises and equipment	7,741
Accrued interest receivable	2,614
Other real estate owned	1,676
Company-owned life insurance	14,857
Other assets	16,822
Deposits	(763,681)
Federal funds purchased	(10,420)
Federal Home Loan Bank advances	(12,515)
Accrued expenses and other liabilities	(8,337)
Net tangible assets acquired	56,058
Definite-lived intangible assets acquired	10,763
Loan servicing rights	8,983
Goodwill	81,952
Purchase price	157,756
LSB Financial Corp. [Member]
Business Acquisition [Line Items]
Cash and cash equivalents	7,589
Investment securities	63,684
Federal Home Loan Bank stock	3,185
Loans held for sale	1,035
Loans	235,377
Premises and equipment	6,492
Accrued interest receivable	1,044
Other real estate owned	30
Company-owned life insurance	7,438
Other assets	11,490
Deposits	(292,068)
Federal Home Loan Bank advances	(15,203)
Accrued expenses and other liabilities	(4,582)
Net tangible assets acquired	25,511
Definite-lived intangible assets acquired	2,618
Loan servicing rights	990
Goodwill	40,476
Purchase price	69,595
Founders Financial Corporation [Member]
Business Acquisition [Line Items]
Cash and cash equivalents	3,978
Investment securities	75,383
Federal Home Loan Bank stock	1,810
Loans held for sale	3,473
Loans	339,569
Premises and equipment	3,604
Accrued interest receivable	1,260
Other real estate owned	674
Company-owned life insurance	8,297
Other assets	8,804
Deposits	(376,656)
Securities sold under agreements to repurchase	(12,492)
Federal Home Loan Bank advances	(26,888)
Accrued expenses and other liabilities	(1,307)
Net tangible assets acquired	29,509
Definite-lived intangible assets acquired	5,515
Loan servicing rights	664
Goodwill	56,014
Purchase price	$ 91,702

Acquisition and Divestiture A68

Acquisition and Divestiture Activity - Schedule of Components of Estimated Fair Value of Intangible Assets (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2016USD ($)
Core Deposit [Member] | Tower Financial Corporation [Member]
Business Acquisition [Line Items]
Estimated Fair Value	$ 4.6
Estimated Useful Lives (Years)	7 years
Core Deposit [Member] | United Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Estimated Fair Value	$ 5.9
Estimated Useful Lives (Years)	7 years
Core Deposit [Member] | Founders Financial Corporation [Member]
Business Acquisition [Line Items]
Estimated Fair Value	$ 2.9
Estimated Useful Lives (Years)	7 years
Customer Trust Relationships [Member] | Tower Financial Corporation [Member]
Business Acquisition [Line Items]
Estimated Fair Value	$ 3.8
Estimated Useful Lives (Years)	12 years
Customer Trust Relationships [Member] | United Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Estimated Fair Value	$ 4.9
Estimated Useful Lives (Years)	12 years
Customer Trust Relationships [Member] | Founders Financial Corporation [Member]
Business Acquisition [Line Items]
Estimated Fair Value	$ 2.6
Estimated Useful Lives (Years)	12 years

Acquisition and Divestiture A69

Acquisition and Divestiture Activity - Schedule of Acquired Loan Data (Detail) $ in Thousands	Dec. 31, 2016USD ($)
Tower Financial Corporation [Member]
Loans at Acquisition Date [Line Items]
Fair Value of Acquired Loans at Acquisition Date	$ 371,054
Tower Financial Corporation [Member] | Acquired Receivables Subject to ASC 310-30 [Member]
Loans at Acquisition Date [Line Items]
Fair Value of Acquired Loans at Acquisition Date	12,855
Gross Contractual Amounts Receivable at Acquisition Date	22,746
Best Estimate at Acquisition Date of Contractual Cash Flows Not Expected to be Collected	5,826
Tower Financial Corporation [Member] | Acquired Receivables Not Subject to ASC 310-30 [Member]
Loans at Acquisition Date [Line Items]
Fair Value of Acquired Loans at Acquisition Date	358,199
Gross Contractual Amounts Receivable at Acquisition Date	450,865
Best Estimate at Acquisition Date of Contractual Cash Flows Not Expected to be Collected	42,302
LSB Financial Corp. [Member]
Loans at Acquisition Date [Line Items]
Fair Value of Acquired Loans at Acquisition Date	235,377
LSB Financial Corp. [Member] | Acquired Receivables Subject to ASC 310-30 [Member]
Loans at Acquisition Date [Line Items]
Fair Value of Acquired Loans at Acquisition Date	11,986
Gross Contractual Amounts Receivable at Acquisition Date	24,493
Best Estimate at Acquisition Date of Contractual Cash Flows Not Expected to be Collected	9,903
LSB Financial Corp. [Member] | Acquired Receivables Not Subject to ASC 310-30 [Member]
Loans at Acquisition Date [Line Items]
Fair Value of Acquired Loans at Acquisition Date	223,391
Gross Contractual Amounts Receivable at Acquisition Date	340,832
Best Estimate at Acquisition Date of Contractual Cash Flows Not Expected to be Collected	57,884
United Bancorp, Inc. [Member]
Loans at Acquisition Date [Line Items]
Fair Value of Acquired Loans at Acquisition Date	632,016
United Bancorp, Inc. [Member] | Acquired Receivables Subject to ASC 310-30 [Member]
Loans at Acquisition Date [Line Items]
Fair Value of Acquired Loans at Acquisition Date	8,391
Gross Contractual Amounts Receivable at Acquisition Date	15,483
Best Estimate at Acquisition Date of Contractual Cash Flows Not Expected to be Collected	5,487
United Bancorp, Inc. [Member] | Acquired Receivables Not Subject to ASC 310-30 [Member]
Loans at Acquisition Date [Line Items]
Fair Value of Acquired Loans at Acquisition Date	623,625
Gross Contractual Amounts Receivable at Acquisition Date	798,967
Best Estimate at Acquisition Date of Contractual Cash Flows Not Expected to be Collected	89,430
Founders Financial Corporation [Member]
Loans at Acquisition Date [Line Items]
Fair Value of Acquired Loans at Acquisition Date	339,569
Founders Financial Corporation [Member] | Acquired Receivables Subject to ASC 310-30 [Member]
Loans at Acquisition Date [Line Items]
Fair Value of Acquired Loans at Acquisition Date	6,607
Gross Contractual Amounts Receivable at Acquisition Date	11,103
Best Estimate at Acquisition Date of Contractual Cash Flows Not Expected to be Collected	2,684
Founders Financial Corporation [Member] | Acquired Receivables Not Subject to ASC 310-30 [Member]
Loans at Acquisition Date [Line Items]
Fair Value of Acquired Loans at Acquisition Date	332,962
Gross Contractual Amounts Receivable at Acquisition Date	439,031
Best Estimate at Acquisition Date of Contractual Cash Flows Not Expected to be Collected	61,113
Anchor BanCorp Wisconsin Inc [Member]
Loans at Acquisition Date [Line Items]
Fair Value of Acquired Loans at Acquisition Date	1,637,806
Anchor BanCorp Wisconsin Inc [Member] | Acquired Receivables Subject to ASC 310-30 [Member]
Loans at Acquisition Date [Line Items]
Fair Value of Acquired Loans at Acquisition Date	20,174
Gross Contractual Amounts Receivable at Acquisition Date	29,544
Best Estimate at Acquisition Date of Contractual Cash Flows Not Expected to be Collected	6,153
Anchor BanCorp Wisconsin Inc [Member] | Acquired Receivables Not Subject to ASC 310-30 [Member]
Loans at Acquisition Date [Line Items]
Fair Value of Acquired Loans at Acquisition Date	1,617,632
Gross Contractual Amounts Receivable at Acquisition Date	2,143,532
Best Estimate at Acquisition Date of Contractual Cash Flows Not Expected to be Collected	$ 274,155

Acquisition and Divestiture A70

Acquisition and Divestiture Activity - Summary of Unaudited Pro-Forma Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition, Pro Forma Information [Abstract]
Revenue	$ 701,303	$ 700,500
Income before income taxes	$ 241,068	$ 195,347

Accumulated Other Comprehensi71

Accumulated Other Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (34,797)	$ (31,555)	$ (44,466)
Other comprehensive income (loss) before reclassifications	(32,953)	(4,473)	20,492
Amounts reclassified from accumulated other comprehensive income (loss)	8,378	1,231	(7,581)
Net other comprehensive income (loss)	(24,575)	(3,242)	12,911
Ending Balance	(59,372)	(34,797)	(31,555)
Accumulated Unrealized Gains and Losses on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(3,806)	(748)	(21,108)
Other comprehensive income (loss) before reclassifications	(31,513)	554	26,391
Amounts reclassified from accumulated other comprehensive income (loss)	(3,693)	(3,612)	(6,031)
Net other comprehensive income (loss)	(35,206)	(3,058)	20,360
Ending Balance	(39,012)	(3,806)	(748)
Accumulated Unrealized Gains and Losses on Held-to-Maturity Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(14,480)	(15,776)	(16,767)
Amounts reclassified from accumulated other comprehensive income (loss)	1,170	1,296	991
Net other comprehensive income (loss)	1,170	1,296	991
Ending Balance	(13,310)	(14,480)	(15,776)
Accumulated Gains and Losses on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(9,276)	(5,935)	(190)
Other comprehensive income (loss) before reclassifications	(1,440)	(5,027)	(5,899)
Amounts reclassified from accumulated other comprehensive income (loss)	4,001	1,686	154
Net other comprehensive income (loss)	2,561	(3,341)	(5,745)
Ending Balance	(6,715)	(9,276)	(5,935)
Accumulated Defined Benefit Pension Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(7,235)	(9,096)	(6,401)
Amounts reclassified from accumulated other comprehensive income (loss)	6,900	1,861	(2,695)
Net other comprehensive income (loss)	6,900	1,861	(2,695)
Ending Balance	$ (335)	$ (7,235)	$ (9,096)

Accumulated Other Comprehensi72

Accumulated Other Comprehensive Income (Loss) - Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net securities gains									$ 5,848	$ 5,718	$ 9,830
Interest income/(expense)	$ 109,917	$ 107,803	$ 99,340	$ 85,643	$ 85,922	$ 97,104	$ 92,097	$ 90,993	402,703	366,116	366,370
Salaries and employee benefits, Actuarial gains/(losses) and settlement cost									11,203	3,002	(4,333)
Impairment losses											(100)
Income before income taxes									(5,848)	(5,718)	(9,830)
Income tax (expense) benefit	(14,710)	(10,969)	(30,812)	(9,671)	(11,598)	(16,395)	(8,959)	(9,225)	(66,162)	(46,177)	(38,297)
Net income	$ 33,456	$ 34,709	$ 39,122	$ 26,977	$ 31,985	$ 37,669	$ 26,156	$ 20,906	134,264	116,716	103,667
Reclassifications out of Accumulated Other Comprehensive Income (Loss) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income									(8,378)	(1,231)	7,581
Reclassifications out of Accumulated Other Comprehensive Income (Loss) [Member] | Accumulated Unrealized Gains and Losses on Available-for-Sale Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net securities gains									5,848	5,718	9,830
Impairment losses											(100)
Income before income taxes									5,848	5,718	9,730
Income tax (expense) benefit									(2,155)	(2,106)	(3,699)
Net income									3,693	3,612	6,031
Reclassifications out of Accumulated Other Comprehensive Income (Loss) [Member] | Accumulated Unrealized Gains and Losses on Held-to-Maturity Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income/(expense)									(1,776)	(1,692)	(1,437)
Income tax (expense) benefit									606	396	446
Net income									(1,170)	(1,296)	(991)
Reclassifications out of Accumulated Other Comprehensive Income (Loss) [Member] | Accumulated Gains and Losses on Cash Flow Hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax (expense) benefit									2,452	1,033	94
Net income									(4,001)	(1,686)	(154)
Reclassifications out of Accumulated Other Comprehensive Income (Loss) [Member] | Accumulated Gains and Losses on Cash Flow Hedges [Member] | Interest Rate Contracts [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income/(expense)									(6,453)	(2,719)	(248)
Reclassifications out of Accumulated Other Comprehensive Income (Loss) [Member] | Accumulated Defined Benefit Pension Plans [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Salaries and employee benefits, Actuarial gains/(losses) and settlement cost									(11,203)	(3,002)	4,333
Income tax (expense) benefit									4,303	1,141	(1,638)
Net income									$ (6,900)	$ (1,861)	$ 2,695

Investment Securities - Amortiz

Investment Securities - Amortized Cost and Fair Value of Available-for-Sale and Held-to-Maturity Investment Securities Portfolio (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Amortized Cost	$ 2,858,677	$ 2,424,063
Available-for-Sale, Unrealized Gains	12,433	25,766
Available-for-Sale, Unrealized Losses	(73,936)	(31,608)
Available-for-Sale securities, Fair Value	2,797,174	2,418,221
Held-to-Maturity, Amortized Cost	745,090	872,111
Held-to-Maturity, Unrealized Gains	39,642	57,309
Held-to-Maturity, Unrealized Losses	(560)	(3)
Held-to-Maturity, Fair Value	784,172	929,417
U.S. Treasury [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Amortized Cost	6,963	11,968
Available-for-Sale, Unrealized Gains	140	190
Available-for-Sale, Unrealized Losses		(8)
Available-for-Sale securities, Fair Value	7,103	12,150
U.S. Government-Sponsored Entities and Agencies [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Amortized Cost	506,234	615,578
Available-for-Sale, Unrealized Gains	113	1,495
Available-for-Sale, Unrealized Losses	(12,391)	(3,523)
Available-for-Sale securities, Fair Value	493,956	613,550
Held-to-Maturity, Amortized Cost	40,131	142,864
Held-to-Maturity, Unrealized Gains	427	2,899
Held-to-Maturity, Fair Value	40,558	145,763
Mortgage-Backed Securities - Agency [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Amortized Cost	1,551,465	1,065,936
Available-for-Sale, Unrealized Gains	6,923	10,970
Available-for-Sale, Unrealized Losses	(33,369)	(10,545)
Available-for-Sale securities, Fair Value	1,525,019	1,066,361
Held-to-Maturity, Amortized Cost	10,640	16,042
Held-to-Maturity, Unrealized Gains	300	562
Held-to-Maturity, Fair Value	10,940	16,604
States and Political Subdivisions [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Amortized Cost	446,003	375,671
Available-for-Sale, Unrealized Gains	4,183	11,960
Available-for-Sale, Unrealized Losses	(13,502)	(335)
Available-for-Sale securities, Fair Value	436,684	387,296
Held-to-Maturity, Amortized Cost	694,319	713,205
Held-to-Maturity, Unrealized Gains	38,915	53,848
Held-to-Maturity, Unrealized Losses	(560)	(3)
Held-to-Maturity, Fair Value	732,674	767,050
Pooled Trust Preferred Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Amortized Cost	17,011	17,320
Available-for-Sale, Unrealized Losses	(8,892)	(9,420)
Available-for-Sale securities, Fair Value	8,119	7,900
Other Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Amortized Cost	331,001	337,590
Available-for-Sale, Unrealized Gains	1,074	1,151
Available-for-Sale, Unrealized Losses	(5,782)	(7,777)
Available-for-Sale securities, Fair Value	$ 326,293	$ 330,964

Investment Securities - Schedul

Investment Securities - Schedule of Proceeds from Sales or Calls and Realized Gain and Losses of Available-for-sale Investment Securities and Other Securities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sales of available-for-sale securities	$ 243,312	$ 343,486	$ 214,912
Proceeds from calls of available-for-sale securities	1,177,130	764,649	468,764
Total	878,936	747,763	338,053
Realized gains on sales of available-for-sale securities	5,423	5,640	9,938
Realized losses on sales of available-for-sale securities	(450)	(518)	(128)
Other securities gains	100	6	337
Net securities gains	5,848	5,718	9,830
Calls [Member]
Schedule of Available-for-sale Securities [Line Items]
Proceeds from calls of available-for-sale securities	635,624	404,277	123,141
Realized gains on calls of available-for-sale securities	922	605	154
Realized losses on calls of available-for-sale securities	$ (147)	$ (15)	$ (471)

Investment Securities - Additio

Investment Securities - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2016USD ($)SecuritySegment	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Investment [Line Items]
Proceeds from sales of investment securities held-to-maturity		$ 855,000
Net securities gains	$ 5,848,000	5,718,000	$ 9,830,000
Securities pledged to secure public and other funds, carrying value	1,400,000,000	1,400,000,000
Trading securities that consist of mutual funds	$ 4,982,000	3,941,000
Number of segments | Segment	2
Other-than-temporary-impairment losses on securities	$ 0	0	100,000
Number of securities in security portfolio | Security	1,715
Number of securities in unrealized loss position | Security	507
Unrealized losses	$ 73,936,000	31,608,000
Other-than-temporary-impairment losses			$ 100,000
Municipal Bonds [Member]
Investment [Line Items]
Proceeds from sales of investment securities held-to-maturity		800,000
Net securities gains		52,000
Eastern Indiana [Member]
Investment [Line Items]
Investment securities issued by states and political subdivisions, market value	$ 369,400,000
State and political subdivision investment, equity percentage	20.40%
Percentage of municipal bonds rated A or better	97.00%
Percentage of non rated local interest bonds	3.00%
Texas [Member]
Investment [Line Items]
Investment securities issued by states and political subdivisions, market value	$ 198,200,000
State and political subdivision investment, equity percentage	10.90%
Former Directors and Executives [Member]
Investment [Line Items]
Trading securities that consist of mutual funds	$ 5,000,000	3,900,000
Pooled Trust Preferred Securities, Not Subject to FASB ASC 325-10 [Member]
Investment [Line Items]
Number of trust preferred securities | Security	2
Securities portfolio at fair value	$ 7,800,000
Unrealized losses	$ 6,000,000
Pooled Trust Preferred Securities, Subject To FASB ASC 325-10 [Member]
Investment [Line Items]
Number of trust preferred securities | Security	1
Securities portfolio at fair value	$ 300,000
Unrealized losses	$ 2,900,000
Pooled Trust Preferred Securities [Member]
Investment [Line Items]
Number of trust preferred securities | Security	3
Securities portfolio at fair value	$ 8,100,000
Unrealized losses	8,900,000
Unrealized losses	8,892,000	9,420,000
Other-than-temporary-impairment losses	$ 0	$ 0

Investment Securities - Expecte

Investment Securities - Expected Maturities of Investment Securities Portfolio (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Available-for-Sale, Maturity, Within one year, Amortized Cost	$ 37,370
Available-for-Sale, Maturity, One to five years, Amortized Cost	320,815
Available-for-Sale, Maturity, Five to ten years, Amortized Cost	329,607
Available-for-Sale, Maturity, Beyond ten years, Amortized Cost	2,170,885
Available-for-Sale, Amortized Cost	2,858,677	$ 2,424,063
Held-to-Maturity, Maturity, Within one year, Amortized Cost	10,796
Held-to-Maturity, Maturity, One to five years, Amortized Cost	74,451
Held-to-Maturity, Maturity, Five to ten years, Amortized Cost	129,452
Held-to-Maturity, Maturity, Beyond ten years, Amortized Cost	530,391
Held-to-Maturity, Amortized Cost	745,090	872,111
Available-for-Sale, Maturity, Within one year, Fair Value	37,431
Available-for-Sale, Maturity, One to five years, Fair Value	318,852
Available-for-Sale, Maturity, Five to ten years, Fair Value	329,892
Available-for-Sale, Maturity, Beyond ten years, Fair Value	2,110,999
Available-for-Sale securities, Fair Value	2,797,174	2,418,221
Held-to-Maturity, Maturity, Within one year, Fair Value	10,906
Held-to-Maturity, Maturity, One to five years, Fair Value	77,228
Held-to-Maturity, Maturity, Five to ten years, Fair Value	135,004
Held-to-Maturity, Maturity, Beyond ten years, Fair Value	561,034
Held-to-Maturity, Fair Value	$ 784,172	$ 929,417
Available-for-Sale, Maturity, Within one year, Weighted Average Yield	1.72%
Available-for-Sale, Maturity, One to five years, Weighted Average Yield	2.18%
Available-for-Sale, Maturity, Five to ten years, Weighted Average Yield	2.85%
Available-for-Sale, Maturity, Beyond ten years, Weighted Average Yield	2.43%
Available-for-Sale, Weighted Average Yield	2.44%
Held-to-Maturity, Maturity, Within one year, Weighted Average Yield	4.02%
Held-to-Maturity, Maturity, One to five years, Weighted Average Yield	4.71%
Held-to-Maturity, Maturity, Five to ten years, Weighted Average Yield	4.86%
Held-to-Maturity, Maturity, Beyond ten years, Weighted Average Yield	5.58%
Held-to-Maturity, Weighted Average Yield	5.35%

Investment Securities - Investm

Investment Securities - Investment Securities with Unrealized Losses by Aggregated Major Security Type and Length of Time in Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	$ 2,017,134	$ 618,592
Available-for-Sale, Less than 12 Months, Unrealized Losses	(58,667)	(7,822)
Available-for-Sale, 12 months or longer, Fair Value	197,213	501,326
Available-for-Sale, 12 months or longer, Unrealized Losses	(15,269)	(23,786)
Available-for-Sale, Fair Value	2,214,347	1,119,918
Available-for-Sale, Unrealized Losses	(73,936)	(31,608)
Held-to-Maturity, Less than 12 Months, Fair Value	59,481	2,026
Held-to-Maturity, Less than 12 Months, Unrealized Losses	(560)	(3)
Held-to-Maturity, 12 months or longer, Fair Value	0	0
Held-to-Maturity, 12 months or longer, Unrealized Losses	0	0
Held-to-Maturity, Fair Value	59,481	2,026
Held-to-Maturity, Unrealized Losses	(560)	(3)
U.S. Treasury [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value		6,505
Available-for-Sale, Less than 12 Months, Unrealized Losses		(8)
Available-for-Sale, Fair Value		6,505
Available-for-Sale, Unrealized Losses		(8)
U.S. Government-Sponsored Entities and Agencies [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	432,192	160,751
Available-for-Sale, Less than 12 Months, Unrealized Losses	(12,391)	(1,492)
Available-for-Sale, 12 months or longer, Fair Value		122,581
Available-for-Sale, 12 months or longer, Unrealized Losses		(2,031)
Available-for-Sale, Fair Value	432,192	283,332
Available-for-Sale, Unrealized Losses	(12,391)	(3,523)
Mortgage-Backed Securities - Agency [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	1,177,093	256,359
Available-for-Sale, Less than 12 Months, Unrealized Losses	(30,295)	(3,444)
Available-for-Sale, 12 months or longer, Fair Value	57,636	239,047
Available-for-Sale, 12 months or longer, Unrealized Losses	(3,074)	(7,101)
Available-for-Sale, Fair Value	1,234,729	495,406
Available-for-Sale, Unrealized Losses	(33,369)	(10,545)
States and Political Subdivisions [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	286,351	38,373
Available-for-Sale, Less than 12 Months, Unrealized Losses	(13,247)	(161)
Available-for-Sale, 12 months or longer, Fair Value	4,919	5,137
Available-for-Sale, 12 months or longer, Unrealized Losses	(255)	(174)
Available-for-Sale, Fair Value	291,270	43,510
Available-for-Sale, Unrealized Losses	(13,502)	(335)
Held-to-Maturity, Less than 12 Months, Fair Value	59,481	2,026
Held-to-Maturity, Less than 12 Months, Unrealized Losses	(560)	(3)
Held-to-Maturity, 12 months or longer, Fair Value	0	0
Held-to-Maturity, 12 months or longer, Unrealized Losses	0	0
Held-to-Maturity, Fair Value	59,481	2,026
Held-to-Maturity, Unrealized Losses	(560)	(3)
Pooled Trust Preferred Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, 12 months or longer, Fair Value	8,119	7,900
Available-for-Sale, 12 months or longer, Unrealized Losses	(8,892)	(9,420)
Available-for-Sale, Fair Value	8,119	7,900
Available-for-Sale, Unrealized Losses	(8,892)	(9,420)
Other Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	121,498	156,604
Available-for-Sale, Less than 12 Months, Unrealized Losses	(2,734)	(2,717)
Available-for-Sale, 12 months or longer, Fair Value	126,539	126,661
Available-for-Sale, 12 months or longer, Unrealized Losses	(3,048)	(5,060)
Available-for-Sale, Fair Value	248,037	283,265
Available-for-Sale, Unrealized Losses	$ (5,782)	$ (7,777)

Investment Securities - Trust P

Investment Securities - Trust Preferred Securities (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)Item	Dec. 31, 2015USD ($)
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale securities, Fair Value	$ 2,797,174	$ 2,418,221
Pooled Trust Preferred Securities One [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Amortized Cost	17,011
Available-for-Sale securities, Fair Value	8,119
Available-for-Sale, Unrealized Gain/ (Loss)	(8,892)
Realized Losses 2016	$ 0
Pooled Trust Preferred Securities One [Member] | Reg Div Funding 2004 [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Pooled trust preferred securities, Class	B2
Lowest Credit Rating	D
Amortized Cost	$ 3,111
Available-for-Sale securities, Fair Value	251
Available-for-Sale, Unrealized Gain/ (Loss)	(2,860)
Realized Losses 2016	$ 0
# of Issuers Currently Performing | Item	21
# of Issuers Currently Remaining | Item	38
Actual Deferrals and Defaults as a Percent of Original Collateral	34.70%
Expected Defaults as a % of Remaining Performing Collateral	8.40%
Excess Subordination as a % of Current Performing Collateral	0.00%
Pooled Trust Preferred Securities One [Member] | Pretsl XXVII LTD [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Pooled trust preferred securities, Class	B
Lowest Credit Rating	B
Amortized Cost	$ 4,422
Available-for-Sale securities, Fair Value	2,333
Available-for-Sale, Unrealized Gain/ (Loss)	(2,089)
Realized Losses 2016	$ 0
# of Issuers Currently Performing | Item	35
# of Issuers Currently Remaining | Item	44
Actual Deferrals and Defaults as a Percent of Original Collateral	16.70%
Expected Defaults as a % of Remaining Performing Collateral	12.20%
Excess Subordination as a % of Current Performing Collateral	32.30%
Pooled Trust Preferred Securities One [Member] | Trapeza Ser 13A [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Pooled trust preferred securities, Class	A2A
Lowest Credit Rating	BBB
Amortized Cost	$ 9,478
Available-for-Sale securities, Fair Value	5,535
Available-for-Sale, Unrealized Gain/ (Loss)	(3,943)
Realized Losses 2016	$ 0
# of Issuers Currently Performing | Item	50
# of Issuers Currently Remaining | Item	55
Actual Deferrals and Defaults as a Percent of Original Collateral	4.50%
Expected Defaults as a % of Remaining Performing Collateral	8.30%
Excess Subordination as a % of Current Performing Collateral	49.70%
Single Issuer Trust Preferred Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Amortized Cost	$ 9,772
Available-for-Sale securities, Fair Value	9,210
Available-for-Sale, Unrealized Gain/ (Loss)	(562)
Realized Losses 2016	$ 0
Single Issuer Trust Preferred Securities [Member] | Fleet Cap Tr V (BOA) [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Lowest Credit Rating	BB+
Amortized Cost	$ 3,397
Available-for-Sale securities, Fair Value	3,045
Available-for-Sale, Unrealized Gain/ (Loss)	(352)
Realized Losses 2016	$ 0
Single Issuer Trust Preferred Securities [Member] | J P Morgan Chase Cap XIII [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Lowest Credit Rating	BBB-
Amortized Cost	$ 4,767
Available-for-Sale securities, Fair Value	4,369
Available-for-Sale, Unrealized Gain/ (Loss)	(398)
Realized Losses 2016	$ 0
Single Issuer Trust Preferred Securities [Member] | NB-Global [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Lowest Credit Rating	BB+
Amortized Cost	$ 786
Available-for-Sale securities, Fair Value	905
Available-for-Sale, Unrealized Gain/ (Loss)	119
Realized Losses 2016	$ 0
Single Issuer Trust Preferred Securities [Member] | Chase Cap II [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Lowest Credit Rating	BBB-
Amortized Cost	$ 822
Available-for-Sale securities, Fair Value	891
Available-for-Sale, Unrealized Gain/ (Loss)	69
Realized Losses 2016	0
Trust Preferred Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Amortized Cost	26,783
Available-for-Sale securities, Fair Value	17,329
Available-for-Sale, Unrealized Gain/ (Loss)	(9,454)
Realized Losses 2016	$ 0

Loans Held for Sale - Additiona

Loans Held for Sale - Additional Information (Detail) - USD ($)	3 Months Ended
	Sep. 30, 2015	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015
Servicing Assets at Fair Value [Line Items]
Loans held for sale sold	$ 193,600,000
Gain loss on loans held for sale	$ 100,000
Loans held for sale under branch divestitures			$ 90,682,000	$ 13,810,000
Southern Illinois Franchise [Member]
Servicing Assets at Fair Value [Line Items]
Loans held for sale under branch divestitures			0
Residential Mortgage Loans [Member]
Servicing Assets at Fair Value [Line Items]
Mortgage loans held for sale			$ 90,700,000	$ 13,800,000
Commercial Real Estate [Member]
Servicing Assets at Fair Value [Line Items]
Loans reclassified from held for investment to held for sale		$ 197,900,000

Finance Receivables and Allow80

Finance Receivables and Allowance for Credit Losses - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2016USD ($)SecurityLoan	Dec. 31, 2015USD ($)SecurityLoan	Dec. 31, 2014USD ($)SecurityLoan	May 01, 2016USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 9,010,512,000	$ 6,948,405,000
Loan placed on nonaccrual when past due, number of days	90 days
Loan participations	$ 424,700,000
Loan participations sold	227,500,000
Loan participations retained	$ 197,200,000
Troubled debt restructuring term	6 months
Minimum number of days for loan charge off to be recorded	120 days
Maximum number of days for loan charge off to be recorded	180 days
Nonaccrual period for loans	90 days
Financing receivable TDR's included with non-accrual loans	$ 26,300,000	30,000,000
Financing receivable troubled debt restructurings specific reserves	4,000,000	2,300,000
Unfunded commitments on TDRs	6,000,000
Increase (decrease) in allowance for loan losses	(2,300,000)	(800,000)	$ 500,000
Allowance for loan losses charge-offs	$ 800,000	200,000	$ 100,000
Number of days for a loan to be considered to be in payment default	90 days
Number of loans modified as TDRs | SecurityLoan			0
Troubled debt restructurings which was a payment default	$ 300,000	1,400,000
Outstanding loans including principal, interest, fees and penalties	268,000,000	321,500,000
Accretion recorded as loan interest income	23,400,000	35,500,000
Financing receivable allowance for loan losses related to purchased loans	300,000	1,400,000
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	1,875,030,000	1,603,158,000
Consumer [Member] | Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	230,854,000	133,478,000
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	1,917,099,000	1,804,615,000
Total	1,917,099,000	1,814,940,000
Commercial [Member] | Criticized [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	45,614,000	55,570,000
Commercial [Member] | Classified - Substandard [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	63,978,000	24,723,000
Commercial [Member] | Classified - Nonaccrual [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	53,062,000	58,469,000
Commercial [Member] | Classified - Doubtful [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	3,522,000	3,506,000
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	3,130,853,000	1,868,972,000
Commercial Real Estate [Member] | Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	2,931,344,000	1,662,372,000
Total	2,931,344,000	1,680,284,000
Commercial Real Estate [Member] | Other [Member] | Criticized [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	49,619,000	75,477,000
Commercial Real Estate [Member] | Other [Member] | Classified - Substandard [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	18,128,000	49,091,000
Commercial Real Estate [Member] | Other [Member] | Classified - Nonaccrual [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	32,234,000	39,521,000
Commercial Real Estate [Member] | Other [Member] | Classified - Doubtful [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	9,023,000	7,886,000
Commercial Real Estate [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	199,509,000	185,449,000
Total	199,509,000	188,688,000
Commercial Real Estate [Member] | Construction [Member] | Criticized [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	229,000	3,300,000
Commercial Real Estate [Member] | Construction [Member] | Classified - Substandard [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	1,636,000	1,857,000
Commercial Real Estate [Member] | Construction [Member] | Classified - Nonaccrual [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	2,769,000	830,000
Anchor BanCorp Wisconsin Inc [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial real estate				$ 926,200,000
Anchor BanCorp Wisconsin Inc [Member] | Consumer [Member] | Student Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	77,100,000
Anchor BanCorp Wisconsin Inc [Member] | Commercial [Member] | Criticized [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	300,000
Anchor BanCorp Wisconsin Inc [Member] | Commercial [Member] | Classified - Nonaccrual [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	700,000
Anchor BanCorp Wisconsin Inc [Member] | Commercial [Member] | Construction [Member] | Criticized [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0
Anchor BanCorp Wisconsin Inc [Member] | Commercial [Member] | Construction [Member] | Classified - Substandard [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0
Anchor BanCorp Wisconsin Inc [Member] | Commercial [Member] | Construction [Member] | Classified - Nonaccrual [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0
Anchor BanCorp Wisconsin Inc [Member] | Commercial [Member] | Construction [Member] | Classified - Doubtful [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	$ 0
Anchor BanCorp Wisconsin Inc [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Percentage of risk-based capital	189.00%
Regulatory guideline limit	300.00%
Anchor BanCorp Wisconsin Inc [Member] | Commercial Real Estate [Member] | Other [Member] | Criticized [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	$ 8,000,000
Anchor BanCorp Wisconsin Inc [Member] | Commercial Real Estate [Member] | Other [Member] | Classified - Substandard [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	3,600,000
Anchor BanCorp Wisconsin Inc [Member] | Commercial Real Estate [Member] | Other [Member] | Classified - Nonaccrual [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	19,900,000
Anchor BanCorp Wisconsin Inc [Member] | Commercial Real Estate [Member] | Other [Member] | Classified - Doubtful [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	700,000
Maximum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Value of small commercial loans on nonaccrual status or 90 days or more delinquent	$ 250,000
Maximum [Member] | Anchor BanCorp Wisconsin Inc [Member] | Consumer [Member] | Student Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan guarantee percentage	100.00%
Minimum [Member] | Anchor BanCorp Wisconsin Inc [Member] | Consumer [Member] | Student Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan guarantee percentage	97.00%
Losses up to $275.0 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loss sharing reimbursement threshold	80.00%
Loss amount covered at 80% up to $275 million	$ 275,000,000
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 1,917,099,000	$ 1,804,615,000
Number of loans modified as TDRs | SecurityLoan	7	5
Commercial Loan [Member] | Credit Concentration Risk [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Concentration of commercial or commercial real estate loans in a single industry, maximum	10.00%
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Number of loans modified as TDRs | SecurityLoan	1	5
Consumer - Other [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Finance receivable recorded investment, Nonperforming	$ 7,068,000	$ 1,497,000
Consumer - Other [Member] | Anchor BanCorp Wisconsin Inc [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Finance receivable recorded investment, Nonperforming	$ 5,800,000
Consumer - Other [Member] | Maximum [Member] | Anchor BanCorp Wisconsin Inc [Member] | Student Loan [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan guarantee percentage	100.00%
Consumer - Other [Member] | Minimum [Member] | Anchor BanCorp Wisconsin Inc [Member] | Student Loan [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan guarantee percentage	97.00%

Finance Receivables and Allow81

Finance Receivables and Allowance for Credit Losses - Schedule of Composition of Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans by lending classification	$ 9,010,512	$ 6,948,405
Allowance for loan losses	(49,808)	(51,296)
Allowance for loan losses - covered loans		(937)
Net loans	8,960,704	6,896,172
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans by lending classification	1,917,099	1,804,615
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans by lending classification	2,087,530	1,644,614
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans by lending classification	1,875,030	1,603,158
Consumer [Member] | Consumer Credit - Home Equity [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans by lending classification	476,439	359,954
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans by lending classification	3,130,853	1,868,972
Construction [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans by lending classification	199,509	185,449
Other [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans by lending classification	230,854	133,478
Other [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans by lending classification	2,931,344	1,662,372
Consumer Credit - Auto [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans by lending classification	$ 1,167,737	1,050,336
Covered Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans by lending classification		$ 107,587

Finance Receivables and Allow82

Finance Receivables and Allowance for Credit Losses - Schedule of Composition of Loans (Parenthetical) (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Receivables [Abstract]
Direct finance leases	$ 10.8	$ 14.4

Finance Receivables and Allow83

Finance Receivables and Allowance for Credit Losses - Schedule of Activity in Related Party Loans (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)
Receivables [Abstract]
Balance at January 1,	$ 8,145
New loans	5,813
Repayments	(5,464)
Balance at December 31,	$ 8,494

Finance Receivables and Allow84

Finance Receivables and Allowance for Credit Losses - Schedule of Activity in Allowance for Loan Losses (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance				$ 52,233				$ 47,849	$ 52,233	$ 47,849	$ 47,145
Charge-offs									(14,610)	(12,877)	(12,650)
Recoveries									11,225	14,338	10,257
Provision	$ (1,756)	$ 1,306	$ 1,319	91	$ 484	$ 167	$ 2,271	1	960	2,923	3,097
Ending balance	49,808				52,233				49,808	52,233	47,849
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance				26,347				20,670	26,347	20,670	16,565
Charge-offs									(5,047)	(3,513)	(3,535)
Recoveries									3,102	5,218	3,125
Provision									(2,921)	3,972	4,515
Ending balance	21,481				26,347				21,481	26,347	20,670
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance				15,993				17,348	15,993	17,348	22,401
Charge-offs									(2,632)	(1,921)	(3,647)
Recoveries									4,763	4,685	3,871
Provision									49	(4,119)	(5,277)
Ending balance	18,173				15,993				18,173	15,993	17,348
Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance				2,051				2,962	2,051	2,962	3,239
Charge-offs									(800)	(1,039)	(793)
Recoveries									174	354	205
Provision									218	(226)	311
Ending balance	1,643				2,051				1,643	2,051	2,962
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance				$ 7,842				$ 6,869	7,842	6,869	4,940
Charge-offs									(6,131)	(6,404)	(4,675)
Recoveries									3,186	4,081	3,056
Provision									3,614	3,296	3,548
Ending balance	$ 8,511				$ 7,842				$ 8,511	$ 7,842	$ 6,869

Finance Receivables and Allow85

Finance Receivables and Allowance for Credit Losses - Schedule of Recorded Investment in Financing Receivables (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Individually evaluated for impairment	$ 7,998	$ 11,488
Allowance for loan losses, Collectively evaluated for impairment	41,532	39,386
Allowance for loan losses, Loans acquired with deteriorated credit quality	278	863
Allowance for loan losses, Covered loans acquired with deteriorated credit quality		496
Total allowance for loan losses	49,808	52,233
Loans and leases outstanding, Individually evaluated for impairment	103,190	102,946
Loans and leases outstanding, Collectively evaluated for impairment	8,851,903	6,764,378
Loans and leases outstanding, Loans acquired with deteriorated credit quality	55,419	33,242
Loans and leases outstanding, Covered loans acquired with deteriorated credit quality		47,839
Total loans	9,010,512	6,948,405
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Individually evaluated for impairment	4,561	7,467
Allowance for loan losses, Collectively evaluated for impairment	16,838	18,295
Allowance for loan losses, Loans acquired with deteriorated credit quality	82	247
Allowance for loan losses, Covered loans acquired with deteriorated credit quality		338
Total allowance for loan losses	21,481	26,347
Loans and leases outstanding, Individually evaluated for impairment	45,960	60,959
Loans and leases outstanding, Collectively evaluated for impairment	1,870,289	1,750,397
Loans and leases outstanding, Loans acquired with deteriorated credit quality	850	691
Loans and leases outstanding, Covered loans acquired with deteriorated credit quality		2,893
Total loans	1,917,099	1,804,615
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Individually evaluated for impairment	3,437	4,021
Allowance for loan losses, Collectively evaluated for impairment	14,717	11,439
Allowance for loan losses, Loans acquired with deteriorated credit quality	19	533
Total allowance for loan losses	18,173	15,993
Loans and leases outstanding, Individually evaluated for impairment	57,230	41,987
Loans and leases outstanding, Collectively evaluated for impairment	3,040,849	1,779,062
Loans and leases outstanding, Loans acquired with deteriorated credit quality	32,774	28,499
Loans and leases outstanding, Covered loans acquired with deteriorated credit quality		19,424
Total loans	3,130,853	1,868,972
Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Collectively evaluated for impairment	1,643	2,038
Allowance for loan losses, Loans acquired with deteriorated credit quality		13
Total allowance for loan losses	1,643	2,051
Loans and leases outstanding, Collectively evaluated for impairment	2,073,950	1,644,631
Loans and leases outstanding, Loans acquired with deteriorated credit quality	13,580	127
Loans and leases outstanding, Covered loans acquired with deteriorated credit quality		16,577
Total loans	2,087,530	1,644,614
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Collectively evaluated for impairment	8,334	7,614
Allowance for loan losses, Loans acquired with deteriorated credit quality	177	70
Allowance for loan losses, Covered loans acquired with deteriorated credit quality		158
Total allowance for loan losses	8,511	7,842
Loans and leases outstanding, Collectively evaluated for impairment	1,866,815	1,590,288
Loans and leases outstanding, Loans acquired with deteriorated credit quality	8,215	3,925
Loans and leases outstanding, Covered loans acquired with deteriorated credit quality		8,945
Total loans	$ 1,875,030	$ 1,603,158

Finance Receivables and Allow86

Finance Receivables and Allowance for Credit Losses - Schedule of Risk Category of Commercial and Commercial Real Estate Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Commercial [Member]
Risk Category Of Loans [Line Items]
Total	$ 1,917,099	$ 1,814,940
Commercial [Member] | Pass [Member]
Risk Category Of Loans [Line Items]
Total	1,750,923	1,672,672
Commercial [Member] | Criticized [Member]
Risk Category Of Loans [Line Items]
Total	45,614	55,570
Commercial [Member] | Classified - Substandard [Member]
Risk Category Of Loans [Line Items]
Total	63,978	24,723
Commercial [Member] | Classified - Nonaccrual [Member]
Risk Category Of Loans [Line Items]
Total	53,062	58,469
Commercial [Member] | Classified - Doubtful [Member]
Risk Category Of Loans [Line Items]
Total	3,522	3,506
Commercial Real Estate [Member] | Construction [Member]
Risk Category Of Loans [Line Items]
Total	199,509	188,688
Commercial Real Estate [Member] | Other [Member]
Risk Category Of Loans [Line Items]
Total	2,931,344	1,680,284
Commercial Real Estate [Member] | Pass [Member] | Construction [Member]
Risk Category Of Loans [Line Items]
Total	194,875	182,701
Commercial Real Estate [Member] | Pass [Member] | Other [Member]
Risk Category Of Loans [Line Items]
Total	2,822,340	1,508,309
Commercial Real Estate [Member] | Criticized [Member] | Construction [Member]
Risk Category Of Loans [Line Items]
Total	229	3,300
Commercial Real Estate [Member] | Criticized [Member] | Other [Member]
Risk Category Of Loans [Line Items]
Total	49,619	75,477
Commercial Real Estate [Member] | Classified - Substandard [Member] | Construction [Member]
Risk Category Of Loans [Line Items]
Total	1,636	1,857
Commercial Real Estate [Member] | Classified - Substandard [Member] | Other [Member]
Risk Category Of Loans [Line Items]
Total	18,128	49,091
Commercial Real Estate [Member] | Classified - Nonaccrual [Member] | Construction [Member]
Risk Category Of Loans [Line Items]
Total	2,769	830
Commercial Real Estate [Member] | Classified - Nonaccrual [Member] | Other [Member]
Risk Category Of Loans [Line Items]
Total	32,234	39,521
Commercial Real Estate [Member] | Classified - Doubtful [Member] | Other [Member]
Risk Category Of Loans [Line Items]
Total	$ 9,023	$ 7,886

Finance Receivables and Allow87

Finance Receivables and Allowance for Credit Losses - Schedule of Recorded Investment in Residential and Consumer Loans Based on Payment Activity (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Consumer Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivable recorded investment	$ 476,439	$ 413,294
Consumer Home Equity [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivable recorded investment, Performing	472,008	410,243
Consumer Home Equity [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivable recorded investment, Nonperforming	4,431	3,051
Consumer Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivable recorded investment	1,167,737	1,050,336
Consumer Auto [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivable recorded investment, Performing	1,166,114	1,048,763
Consumer Auto [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivable recorded investment, Nonperforming	1,623	1,573
Consumer - Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivable recorded investment	230,854	139,528
Consumer - Other [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivable recorded investment, Performing	223,786	138,031
Consumer - Other [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivable recorded investment, Nonperforming	7,068	1,497
Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Residential real estate	2,087,530	1,661,335
Residential [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivable recorded investment, Performing	2,069,856	1,645,293
Residential [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivable recorded investment, Nonperforming	$ 17,674	$ 16,042

Finance Receivables and Allow88

Finance Receivables and Allowance for Credit Losses - Schedule of Impaired Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Impaired [Line Items]
Recorded Investment, Total	$ 108,632	$ 104,872
Unpaid Principal Balance, Total	112,089	109,235
Related Allowance	8,148	11,307
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	4,561	7,111
Recorded Investment with no related allowance	29,001	40,414
Unpaid Principal Balance with no related allowance	29,634	41,212
Recorded Investment with related allowance	16,959	16,377
Unpaid Principal Balance with related allowance	17,283	16,483
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	107	6
Recorded Investment with related allowance	467	237
Unpaid Principal Balance with related allowance	467	237
Commercial Real Estate - Other [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	3,330	4,015
Recorded Investment with no related allowance	30,585	26,998
Unpaid Principal Balance with no related allowance	32,413	30,264
Recorded Investment with related allowance	26,178	14,752
Unpaid Principal Balance with related allowance	26,710	14,802
Residential [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	54	49
Recorded Investment with no related allowance	1,610	1,383
Unpaid Principal Balance with no related allowance	1,631	1,422
Recorded Investment with related allowance	1,081	985
Unpaid Principal Balance with related allowance	1,081	985
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	96	126
Recorded Investment with no related allowance	827	1,201
Unpaid Principal Balance with no related allowance	946	1,305
Recorded Investment with related allowance	1,924	2,525
Unpaid Principal Balance with related allowance	$ 1,924	$ 2,525

Finance Receivables and Allow89

Finance Receivables and Allowance for Credit Losses - Schedule of Impaired Loans (Parenthetical) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2015USD ($)
Receivables [Abstract]
Loans that were previously covered by loss share agreements with the FDIC	$ 4.2

Finance Receivables and Allow90

Finance Receivables and Allowance for Credit Losses - Schedule of Average Balance of Impaired Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment, Total	$ 106,638	$ 95,277
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment with no related allowance	34,708	33,678
Average Recorded Investment with an allowance recorded	16,669	11,924
Commercial Real Estate - Other [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment with no related allowance	28,793	28,637
Average Recorded Investment with an allowance recorded	20,465	14,593
Residential [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment with no related allowance	1,355	985
Average Recorded Investment with an allowance recorded	1,074	1,230
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment with no related allowance	855	943
Average Recorded Investment with an allowance recorded	2,367	2,034
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment with no related allowance		1,085
Average Recorded Investment with an allowance recorded	$ 352	$ 168

Finance Receivables and Allow91

Finance Receivables and Allowance for Credit Losses - Schedule of Average Balance of Impaired Loans (Parenthetical) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2015USD ($)
Receivables [Abstract]
Loans that were previously covered by loss share agreements with the FDIC	$ 4.2

Finance Receivables and Allow92

Finance Receivables and Allowance for Credit Losses - Schedule of Past Due Financing Receivables (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment > 90 Days and Accruing	$ 328	$ 916
Nonaccrual	131,407	132,373
Financing Receivables, Past Due	170,573	153,645
Current	8,839,939	6,794,760
30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivables, Past Due	31,260	16,266
60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivables, Past Due	7,578	4,090
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment > 90 Days and Accruing	23	565
Nonaccrual	56,585	57,536
Financing Receivables, Past Due	57,734	59,003
Current	1,859,365	1,745,612
Commercial [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivables, Past Due	847	802
Commercial [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivables, Past Due	279	100
Construction [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	2,769	749
Financing Receivables, Past Due	2,769	749
Current	196,740	184,700
Other [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	41,257	46,601
Financing Receivables, Past Due	43,059	47,174
Current	2,888,285	1,615,198
Other [Member] | Commercial Real Estate [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivables, Past Due	1,652	438
Other [Member] | Commercial Real Estate [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivables, Past Due	150	135
Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment > 90 Days and Accruing	2	114
Nonaccrual	17,674	14,953
Financing Receivables, Past Due	39,232	26,613
Current	2,048,298	1,618,001
Residential [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivables, Past Due	17,786	9,300
Residential [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivables, Past Due	3,770	2,246
Consumer Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	4,431	2,369
Financing Receivables, Past Due	6,365	3,054
Current	470,074	356,900
Consumer Home Equity [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivables, Past Due	1,511	283
Consumer Home Equity [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivables, Past Due	423	402
Consumer Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment > 90 Days and Accruing	242	202
Nonaccrual	1,623	1,573
Financing Receivables, Past Due	8,805	6,309
Current	1,158,932	1,044,027
Consumer Auto [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivables, Past Due	5,903	3,804
Consumer Auto [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivables, Past Due	1,037	730
Consumer - Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment > 90 Days and Accruing	61	25
Nonaccrual	7,068	1,256
Financing Receivables, Past Due	12,609	2,276
Current	218,245	131,202
Consumer - Other [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivables, Past Due	3,561	830
Consumer - Other [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivables, Past Due	$ 1,919	165
Covered Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment > 90 Days and Accruing		10
Nonaccrual		7,336
Financing Receivables, Past Due		8,467
Current		99,120
Covered Loans [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivables, Past Due		809
Covered Loans [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivables, Past Due		$ 312

Finance Receivables and Allow93

Finance Receivables and Allowance for Credit Losses - Schedule of Activity in Troubled Debt Restructurings (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Beginning balance	$ 44,251	$ 34,953	$ 48,867
(Charge-offs)/recoveries	(993)	1,875	829
Payments	(34,007)	(38,012)	(28,935)
Additions	27,272	45,435	19,011
Interest collected on nonaccrual loans	4,193
Removals - subsequent restructuring			(4,819)
Ending balance	40,716	44,251	34,953
Commercial Loan [Member]
Financing Receivable, Impaired [Line Items]
Beginning balance	23,354	15,205	22,443
(Charge-offs)/recoveries	(1,982)	872	126
Payments	(21,956)	(29,913)	(18,281)
Additions	14,996	37,190	13,696
Interest collected on nonaccrual loans	2,390
Removals - subsequent restructuring			(2,779)
Ending balance	16,802	23,354	15,205
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Beginning balance	14,602	15,226	22,639
(Charge-offs)/recoveries	953	1,064	795
Payments	(10,157)	(6,273)	(9,722)
Additions	11,130	4,585	3,554
Interest collected on nonaccrual loans	1,799
Removals - subsequent restructuring			(2,040)
Ending balance	18,327	14,602	15,226
Residential [Member]
Financing Receivable, Impaired [Line Items]
Beginning balance	2,693	2,063	2,344
(Charge-offs)/recoveries	42	(64)	10
Payments	(513)	(658)	(466)
Additions	761	1,352	175
Interest collected on nonaccrual loans	2
Ending balance	2,985	2,693	2,063
Consumer Loan [Member]
Financing Receivable, Impaired [Line Items]
Beginning balance	3,602	2,459	1,441
(Charge-offs)/recoveries	(6)	3	(102)
Payments	(1,381)	(1,168)	(466)
Additions	385	2,308	1,586
Interest collected on nonaccrual loans	2
Ending balance	$ 2,602	$ 3,602	$ 2,459

Finance Receivables and Allow94

Finance Receivables and Allowance for Credit Losses - Schedule of Loans by Class Modified as Troubled Debt Restructuring (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)SecurityLoan	Dec. 31, 2015USD ($)SecurityLoan	Dec. 31, 2014USD ($)SecurityLoan
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	44	119	97
Pre-modification Outstanding Recorded Investment	$ 27,272	$ 45,435	$ 19,011
Post-modification Outstanding Recorded Investment	$ 27,272	$ 45,435	$ 19,011
Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	20	42	32
Pre-modification Outstanding Recorded Investment	$ 14,996	$ 37,190	$ 13,696
Post-modification Outstanding Recorded Investment	$ 14,996	$ 37,190	$ 13,696
Construction [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan		5	1
Pre-modification Outstanding Recorded Investment		$ 1,162	$ 484
Post-modification Outstanding Recorded Investment		$ 1,162	$ 484
Other [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	10	27	34
Pre-modification Outstanding Recorded Investment	$ 11,130	$ 3,423	$ 3,070
Post-modification Outstanding Recorded Investment	$ 11,130	$ 3,423	$ 3,070
Residential [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	6	13	2
Pre-modification Outstanding Recorded Investment	$ 761	$ 1,352	$ 175
Post-modification Outstanding Recorded Investment	$ 761	$ 1,352	$ 175
Consumer - Other [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	8	32	28
Pre-modification Outstanding Recorded Investment	$ 385	$ 2,308	$ 1,586
Post-modification Outstanding Recorded Investment	$ 385	$ 2,308	$ 1,586

Finance Receivables and Allow95

Finance Receivables and Allowance for Credit Losses - Schedule of Activity of Purchased Impaired Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Impaired [Line Items]
Purchased impaired loans	$ 55,419	$ 81,081
Allowance for loan losses	(278)	(1,359)
Carrying amount, net of allowance	55,141	79,722
Commercial Loan [Member]
Financing Receivable, Impaired [Line Items]
Purchased impaired loans	850	3,584
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Purchased impaired loans	32,774	47,923
Residential [Member]
Financing Receivable, Impaired [Line Items]
Purchased impaired loans	13,580	16,704
Consumer Loan [Member]
Financing Receivable, Impaired [Line Items]
Purchased impaired loans	$ 8,215	$ 12,870

Finance Receivables and Allow96

Finance Receivables and Allowance for Credit Losses - Schedule of Accretable Yield of Noncovered Purchased Credit Impaired Loans, or Income Expected to be Collected (Detail) - Purchased Credit Impaired Loans [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at January 1	$ 45,310	$ 62,533	$ 101,502
New loans purchased	3,217	1,812	8,274
Accretion of income	(23,447)	(35,526)	(77,929)
Reclassifications from (to) nonaccretable difference	10,589	14,189	27,536
Disposals/other adjustments	(2,066)	2,302	3,150
Balance at December 31	$ 33,603	$ 45,310	$ 62,533

Finance Receivables and Allow97

Finance Receivables and Allowance for Credit Losses - Schedule of Receivables for which Contractually Required Payments would not be Collected (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Anchor BanCorp Wisconsin Inc [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractually required payments	$ 29,544
Nonaccretable difference	(6,153)
Cash flows expected to be collected at acquisition	23,391
Accretable yield	(3,217)
Fair value of acquired loans at acquisition	$ 20,174
Founders Financial Corporation [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractually required payments		$ 11,103
Nonaccretable difference		(2,684)
Cash flows expected to be collected at acquisition		8,419
Accretable yield		(1,812)
Fair value of acquired loans at acquisition		$ 6,607

Finance Receivables and Allow98

Finance Receivables and Allowance for Credit Losses - Schedule of Receivables for which Contractually Required Payments would not be Collected (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2016
Anchor BanCorp Wisconsin Inc [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Effective date of acquisition	May 1, 2016
Founders Financial Corporation [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Effective date of acquisition	Jan. 1, 2015

Covered Loans - Additional Info

Covered Loans - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2016
Receivables [Abstract]
Cash received from the FDIC as final payment		$ 8.7
Pre-tax gain	$ 0.2
Percentage of prospective yield adjustments offset		80.00%

Covered Loans - Schedule of Cov

Covered Loans - Schedule of Covered Acquired Impaired Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Impaired Loans By Type [Line Items]
Beginning balance	$ 47,343	$ 77,053
Principal reductions and interest payments	(18,542)	(45,458)
Accretion of loan discount	7,196	21,529
Changes in contractual and expected cash flows due to remeasurement	135	161
Removals due to foreclosure or sale	(1,549)	(1,097)
Loans removed from loss share coverage	(34,583)	(4,845)
Ending balance		47,343
Contractual Cash Flows [Member]
Impaired Loans By Type [Line Items]
Beginning balance	69,857	124,809
Principal reductions and interest payments	(18,195)	(43,792)
Changes in contractual and expected cash flows due to remeasurement	4,431	(4,139)
Removals due to foreclosure or sale	(1,948)	(1,316)
Loans removed from loss share coverage	(54,145)	(5,705)
Ending balance		69,857
Non Accretable Difference [Member]
Impaired Loans By Type [Line Items]
Beginning balance	(4,729)	(12,014)
Principal reductions and interest payments	(347)	(1,666)
Changes in contractual and expected cash flows due to remeasurement	631	8,409
Removals due to foreclosure or sale	136	463
Loans removed from loss share coverage	4,309	79
Ending balance		(4,729)
Accretable Yield [Member]
Impaired Loans By Type [Line Items]
Beginning balance	(17,785)	(35,742)
Accretion of loan discount	7,196	21,529
Changes in contractual and expected cash flows due to remeasurement	(4,927)	(4,109)
Removals due to foreclosure or sale	263	(244)
Loans removed from loss share coverage	$ 15,253	781
Ending balance		$ (17,785)

Covered Loans - Summary of FDIC

Covered Loans - Summary of FDIC Loss Sharing Asset (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Receivables [Abstract]
Beginning balance	$ 9,030	$ 20,603
Adjustments not reflected in income:
Cash received from the FDIC	(10,000)	(3,548)
Other	512	1,009
Adjustments reflected in income:
Amortization	(816)	(10,709)
Higher (lower) loan loss expectations	(13)	275
Impairment/(recovery) of value and net (gain)/loss on sales of other real estate	1,062	1,400
Gain as a result of the early termination agreement with the FDIC, effective June 22, 2016	$ 225
Ending balance		$ 9,030

Other Real Estate Owned - Activ

Other Real Estate Owned - Activity in Other Real Estate Owned (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Real Estate Properties [Line Items]
Beginning Balance	$ 7,594
Ending balance	18,546	$ 7,594
Other Real Estate Owned [Member]
Real Estate Properties [Line Items]
Beginning Balance	7,594	7,241
Additions	22,905	5,665
Sales	(13,638)	(5,710)
(Impairment)/recovery of value	(1,986)	398
Reclassification due to termination of the loss share agreements, effective June 22, 2016	3,671
Ending balance	18,546	7,594
Other Real Estate Owned, Covered [Member]
Real Estate Properties [Line Items]
Beginning Balance	4,904	9,121
Additions	2,093	1,487
Sales	(1,454)	(5,373)
(Impairment)/recovery of value	(1,872)	(331)
Reclassification due to termination of the loss share agreements, effective June 22, 2016	$ (3,671)
Ending balance		$ 4,904

Other Real Estate Owned - Ac103

Other Real Estate Owned - Activity in Other Real Estate Owned (Parenthetical) (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Real Estate Properties [Line Items]
Repossessed personal property	$ 300	$ 200
Othe real estate	18,546	7,594
Other Real Estate Owned [Member]
Real Estate Properties [Line Items]
Othe real estate	18,546	$ 7,594	$ 7,241
Anchor BanCorp Wisconsin Inc [Member] | Other Real Estate Owned [Member]
Real Estate Properties [Line Items]
Othe real estate	$ 17,300

Other Real Estate Owned - Addit

Other Real Estate Owned - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2016USD ($)
Real Estate Properties [Line Items]
Value of foreclosed residential real estate property	$ 1.8
Value of mortgage loans in process of foreclosure	2.8
Losses up to $275.0 [Member]
Real Estate Properties [Line Items]
Loss sharing agreements amount, 80% on assets acquired	$ 275
Loss sharing reimbursement threshold	80.00%

Premises and Equipment - Summar

Premises and Equipment - Summary of Premises and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Total	$ 525,120	$ 281,516
Accumulated depreciation	(95,498)	(84,840)
Premises and equipment, net	429,622	196,676
Land [Member]
Property, Plant and Equipment [Line Items]
Total	71,769	41,604
Buildings [Member]
Property, Plant and Equipment [Line Items]
Total	322,165	111,982
Furniture, Fixtures, and Equipment [Member]
Property, Plant and Equipment [Line Items]
Total	102,631	94,819
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total	$ 28,555	$ 33,111

Premises and Equipment - Additi

Premises and Equipment - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)PropertyTerms	Dec. 31, 2015USD ($)Property	Dec. 31, 2014USD ($)
Property, Plant and Equipment [Line Items]
Depreciation	$ 16,558	$ 14,101	$ 12,366
Number of additional successive terms extendable at the option | Terms	4
Period of extendable lease term, in years	5 years
Lease term, description	Less than one year
Rent expense	$ 25,400	29,100	$ 29,000
Sale leaseback transaction, gain recognized over lease term	10,300	$ 40,700
Anchor BanCorp Wisconsin Inc. [Member]
Property, Plant and Equipment [Line Items]
Increase in assets due to acquisition	$ 35,700
Minimum [Member]
Property, Plant and Equipment [Line Items]
Lease Term	1 year
Maximum [Member]
Property, Plant and Equipment [Line Items]
Lease Term	24 years
Prior Sale Leaseback Transactions [Member]
Property, Plant and Equipment [Line Items]
Total purchase price of assets	$ 196,100
Number of leased properties acquired with deferred gains | Property	20	14
Number of leased properties acquired | Property	23	14
Sale leaseback transaction, gain recognized over lease term	$ 12,000	$ 10,800
Prior Sale Leaseback Transactions [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Lease Term	5 years
Prior Sale Leaseback Transactions [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Lease Term	24 years

Premises and Equipment - Sum107

Premises and Equipment - Summary of Future Minimum Lease Commitments (Detail) $ in Thousands	Dec. 31, 2016USD ($)
Property, Plant and Equipment [Abstract]
2,017	$ 16,928
2,018	15,918
2,019	15,262
2,020	14,679
2,021	14,161
Thereafter	79,881
Total	$ 156,829

Goodwill and Other Intangibl108

Goodwill and Other Intangible Assets - Schedule of Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Beginning balance	$ 584,634	$ 530,845
Acquisitions	111,347	57,619
Divestitures	(40,963)	(3,830)
Ending balance	$ 655,018	$ 584,634

Goodwill and Other Intangibl109

Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Line Items]
Goodwill acquired during the period	$ 111,347,000	$ 57,619,000
Goodwill eliminated due to sale of insurance operations	41,000,000
Amortization expense of other intangible assets	12,486,000	11,746,000	$ 9,120,000
Impairment charges	$ 0	$ 0	$ 0
Core Deposits and Other Intangible Assets [Member] | Minimum [Member]
Goodwill [Line Items]
Estimated useful lives of core deposits and customer relationships	5 years
Core Deposits and Other Intangible Assets [Member] | Maximum [Member]
Goodwill [Line Items]
Estimated useful lives of core deposits and customer relationships	15 years
Customer Business Relationships [Member]
Goodwill [Line Items]
Intangible asset eliminated due to sale of insurance operations	$ 6,700,000
Anchor BanCorp Wisconsin Inc [Member]
Goodwill [Line Items]
Goodwill acquired during the period	111,300,000
Anchor BanCorp Wisconsin Inc [Member] | Core Deposit [Member]
Goodwill [Line Items]
Increase (decrease) in intangible assets	$ 21,600,000

Goodwill and Other Intangibl110

Goodwill and Other Intangible Assets - Schedule of Gross Carrying Amounts and Accumulated Amortization of Other Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 102,623	$ 111,850
Accumulated Amortization and Impairment	(64,946)	(76,542)
Net Carrying Amount	37,677	35,308
Core Deposit [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	81,663	60,103
Accumulated Amortization and Impairment	(53,214)	(43,982)
Net Carrying Amount	28,449	16,121
Customer Business Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		30,787
Accumulated Amortization and Impairment		(23,341)
Net Carrying Amount		7,446
Customer Trust Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	16,547	16,547
Accumulated Amortization and Impairment	(7,753)	(5,286)
Net Carrying Amount	8,794	11,261
Customer Loan Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,413	4,413
Accumulated Amortization and Impairment	(3,979)	(3,933)
Net Carrying Amount	$ 434	$ 480

Goodwill and Other Intangibl111

Goodwill and Other Intangible Assets - Schedule of Estimated Amortization Expense for Future Years (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
2,017	$ 11,015
2,018	8,687
2,019	6,737
2,020	4,883
2,021	3,111
Thereafter	3,244
Net Carrying Amount	$ 37,677	$ 35,308

Loan Servicing Rights - Additio

Loan Servicing Rights - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Transfers and Servicing [Abstract]
Loan servicing rights	$ 25,561	$ 10,468
Principal balance of loans serviced for others	3,385,000	1,263,000
Funds held in escrow	$ 5,300	3,000
Percentage of mortgage loan	99.00%
Fair value of servicing rights	$ 26,800	$ 11,300
Fair value at discount rate	13.00%	11.00%
Fair value inputs weighted average prepayment speed	136.00%	166.00%

Loan Servicing Rights - Compone

Loan Servicing Rights - Components of Loan Servicing Rights and Valuation Allowance (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Transfers and Servicing [Abstract]
Beginning balance	$ 10,502	$ 9,584
Additions	20,280	3,187
Amortization	(5,153)	(2,269)
Ending balance	25,629	10,502
Valuation allowance:
Beginning balance	(34)	(50)
(Additions)/recoveries	(34)	16
Ending balance	(68)	(34)
Loan servicing rights, net	$ 25,561	$ 10,468

Loan Servicing Rights - Comp114

Loan Servicing Rights - Components of Loan Servicing Rights and Valuation Allowance (Parenthetical) (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	May 31, 2016	Dec. 31, 2015
Servicing Assets And Liabilities At Fair Value [Line Items]
Loan servicing rights	$ 25,561		$ 10,468
Anchor BanCorp Wisconsin Inc [Member]
Servicing Assets And Liabilities At Fair Value [Line Items]
Loan servicing rights		$ 15,300

Qualified Affordable Housing115

Qualified Affordable Housing Projects and Other Tax Credit Investments - Schedule of Qualified Affordable Housing Projects and Other Tax Credit Investments (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Investment Holdings [Line Items]
Total	$ 35,048
Total	20,816
Amortization Expense	804	$ 947
Tax Benefit Recognized	(1,125)	(1,358)
LIHTC and Other Qualifying Investments [Member]
Investment Holdings [Line Items]
Proportional amortization method of investment	29,110
Unfunded commitment, Proportional amortization	16,210
Amortization Expense	804	804
Tax Benefit Recognized	(1,125)	(1,125)
FHTC [Member]
Investment Holdings [Line Items]
Equity method investment	4,434
Unfunded commitment, Equity	3,104
CReED [Member]
Investment Holdings [Line Items]
Equity method investment	1,504
Unfunded commitment, Equity	$ 1,502
NMTC [Member]
Investment Holdings [Line Items]
Amortization Expense		143
Tax Benefit Recognized		$ (233)

Qualified Affordable Housing116

Qualified Affordable Housing Projects and Other Tax Credit Investments - Additional Information (Detail)	Dec. 31, 2015USD ($)
Investments in Affordable Housing Projects [Abstract]
Qualified affordable housing projects and other tax credit investments	$ 9,800,000
Unfunded commitments	$ 0

Deposits - Additional Informati

Deposits - Additional Information (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Maturities of Time Deposits [Abstract]
Time deposits, $250,000 or more, total	$ 313.8	$ 103.8

Deposits - Schedule of Maturiti

Deposits - Schedule of Maturities of Total Time Deposits (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Maturities of Time Deposits [Abstract]
Due in 2017	$ 895,033
Due in 2018	292,371
Due in 2019	108,978
Due in 2020	86,090
Due in 2021	44,005
Thereafter	41,631
Total	$ 1,468,108	$ 1,000,067

Securities Sold Under Agreem119

Securities Sold Under Agreements to Repurchase - Schedule of Securities Sold under Agreements to Repurchase and Related Weighted-Average Interest Rates (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Securities Sold under Agreements to Repurchase [Abstract]
Outstanding at end of period	$ 367,052,000	$ 387,409,000
Average amount outstanding	368,757,000	406,117,000
Maximum amount outstanding at any month-end	$ 396,695,000	$ 419,515,000
Weighted average interest rate during period	0.41%	0.37%
Weighted average interest rate at end of period	0.47%	0.38%

Securities Sold Under Agreem120

Securities Sold Under Agreements to Repurchase - Schedule of Remaining Contractual Maturity of Secured Borrowings and Class of Collateral Pledged Under Repurchase Agreements (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Assets Sold under Agreements to Repurchase [Line Items]
Secured borrowings and class of collateral pledged under repurchase agreements	$ 367,052	$ 387,409
U.S. Treasury [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Secured borrowings and class of collateral pledged under repurchase agreements	367,052
Overnight and Continuous [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Secured borrowings and class of collateral pledged under repurchase agreements	317,052
Overnight and Continuous [Member] | U.S. Treasury [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Secured borrowings and class of collateral pledged under repurchase agreements	317,052
Up to 30 Days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Secured borrowings and class of collateral pledged under repurchase agreements	25,000
Up to 30 Days [Member] | U.S. Treasury [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Secured borrowings and class of collateral pledged under repurchase agreements	25,000
Maturity Greater than 90 Days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Secured borrowings and class of collateral pledged under repurchase agreements	25,000
Maturity Greater than 90 Days [Member] | U.S. Treasury [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Secured borrowings and class of collateral pledged under repurchase agreements	$ 25,000

Securities Sold Under Agreem121

Securities Sold Under Agreements to Repurchase - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2016
Securities Sold under Agreements to Repurchase [Abstract]
Gross outstanding balance of repurchase agreements collateralized by securities percentage	111.00%

Federal Home Loan Bank Advan122

Federal Home Loan Bank Advances - Summary of FHLB Advances (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Federal Home Loan Bank, Advances [Line Items]
ASC 815 fair value hedge and other basis adjustments	$ (133)
Total other borrowings	1,353,092	$ 1,023,491
Old National Bank [Member]
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank advances (fixed rates 0.56% to 6.76% and variable rates 0.99% to 1.05%) maturing January 2017 to January 2025	1,353,225	1,022,766
ASC 815 fair value hedge and other basis adjustments	$ (133)	$ 725

Federal Home Loan Bank Advan123

Federal Home Loan Bank Advances - Summary of FHLB Advances (Parenthetical) (Detail) - Old National Bank [Member] - Federal Home Loan Bank Advances [Member]	12 Months Ended
	Dec. 31, 2016
Federal Home Loan Bank, Advances [Line Items]
Maturity, Start date	Jan. 31, 2017
Maturity, End date	Jan. 31, 2025
Minimum [Member]
Federal Home Loan Bank, Advances [Line Items]
Fixed rates	0.56%
Variable rates	0.99%
Maximum [Member]
Federal Home Loan Bank, Advances [Line Items]
Fixed rates	6.76%
Variable rates	1.05%

Federal Home Loan Bank Advan124

Federal Home Loan Bank Advances - Additional Information (Detail)	Dec. 31, 2016	Dec. 31, 2015
Federal Home Loan Bank, Advances [Line Items]
Weighted-average rates of FHLB advances	0.94%	0.72%
Federal Home Loan Bank Advances [Member]
Federal Home Loan Bank, Advances [Line Items]
Percentage of borrowings collateralized by investment securities and residential real estate loans	140.00%

Federal Home Loan Bank Advan125

Federal Home Loan Bank Advances - Summary of Contractual Maturities of FHLB Advances (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Federal Home Loan Banks [Abstract]
Due in 2017	$ 945,544
Due in 2018	170,090
Due in 2019	2,415
Due in 2020	50,000
Due in 2021	0
Thereafter	185,176
ASC 815 fair value hedge and other basis adjustments	(133)
Total	$ 1,353,092	$ 1,023,491

Other Borrowings - Other Borrow

Other Borrowings - Other Borrowings (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Aug. 31, 2014
Debt Instrument [Line Items]
Total other borrowings	$ 1,353,092	$ 1,023,491
Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Senior unsecured bank notes (fixed rate 4.125%) maturing August 2024			$ 175,000
Old National Bancorp [Member]
Debt Instrument [Line Items]
Other basis adjustments	(3,971)	(4,442)
Old National Bancorp [Member] | Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Senior unsecured bank notes (fixed rate 4.125%) maturing August 2024	175,000	175,000
Unamortized debt issuance costs related to Senior unsecured bank notes	(1,182)	(1,338)
Old National Bancorp [Member] | Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Junior subordinated debentures (variable rates of 2.30% to 2.74%) maturing March 2035 to September 2037	45,000	45,000
Old National Bank [Member]
Debt Instrument [Line Items]
Capital lease obligation	$ 4,092	$ 4,036

Other Borrowings - Other Bor127

Other Borrowings - Other Borrowings (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2016	Aug. 31, 2014
Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Fixed rates		4.125%
Maturity date	Aug. 15, 2024
Old National Bancorp [Member] | Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Fixed rates	4.125%
Maturity date	Aug. 15, 2024
Trust Preferred Securities [Member] | Old National Bancorp [Member] | Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Maturity, Start date	Mar. 31, 2035
Maturity, End date	Sep. 30, 2037
Trust Preferred Securities [Member] | Minimum [Member] | Old National Bancorp [Member] | Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Variable rates	2.30%
Trust Preferred Securities [Member] | Maximum [Member] | Old National Bancorp [Member] | Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Variable rates	2.74%

Other Borrowings - Contractual

Other Borrowings - Contractual Maturities of Other Borrowings (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)
Debt Disclosure [Abstract]
Due in 2017	$ 196
Due in 2018	79
Due in 2019	85
Due in 2020	91
Due in 2021	99
Thereafter	223,542
Unamortized debt issuance costs and other basis adjustments	(5,153)
Total	$ 218,939

Other Borrowings - Additional I

Other Borrowings - Additional Information (Detail) $ in Millions	May 01, 2016	Dec. 31, 2006USD ($)	Sep. 30, 2006USD ($)	Dec. 31, 2005USD ($)	Jan. 01, 2004Item	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Aug. 31, 2014USD ($)	Mar. 31, 2007USD ($)	Jul. 31, 2006USD ($)	Mar. 31, 2005USD ($)
Debt Instrument [Line Items]
Preferred securities
Long-term capital lease obligation period, in years					25 years
Long-term capital lease obligation renewal period, in years					10 years
Number of renewal option for 10 years period | Item					1
St Joseph Capital Trust II [Member]
Debt Instrument [Line Items]
Preferred securities											$ 5
Reference rate of the variable interest rate for preferred securities						Three-month London Interbank Offered Rate ("LIBOR") plus 175 basis points
Home Federal Statutory Trust I [Member]
Debt Instrument [Line Items]
Preferred securities			$ 15
Reference rate of the variable interest rate for preferred securities						Three-month LIBOR plus 165 basis points
Tower Capital Trust 2 [Member]
Debt Instrument [Line Items]
Preferred securities				$ 8
Reference rate of the variable interest rate for preferred securities						Three-month LIBOR plus 134 basis points
Tower Capital Trust 3 [Member]
Debt Instrument [Line Items]
Preferred securities		$ 9
Reference rate of the variable interest rate for preferred securities						Three-month LIBOR plus 169 basis points
Anchor BanCorp Wisconsin Inc [Member]
Debt Instrument [Line Items]
Capital lease obligation period	5 years
Junior Subordinated Debt [Member] | St Joseph Capital Trust II [Member] | Trust Preferred Securities [Member]
Debt Instrument [Line Items]
Maturity date						Mar. 17, 2035
LIBOR rate						1.75%
Junior Subordinated Debt [Member] | Home Federal Statutory Trust I [Member] | Trust Preferred Securities [Member]
Debt Instrument [Line Items]
LIBOR rate			1.65%
Junior Subordinated Debt [Member] | Tower Capital Trust 2 [Member] | Trust Preferred Securities [Member]
Debt Instrument [Line Items]
LIBOR rate				1.34%
Junior Subordinated Debt [Member] | Tower Capital Trust 3 [Member] | Trust Preferred Securities [Member]
Debt Instrument [Line Items]
LIBOR rate		1.69%
Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Senior unsecured notes								$ 175
Fixed rates								4.125%
Maturity date						Aug. 15, 2024
Monroe Bancorp Capital Trust I [Member]
Debt Instrument [Line Items]
Preferred securities										$ 3
Reference rate of the variable interest rate for preferred securities						Three-month LIBOR plus 160 basis points
Monroe Bancorp Capital Trust I [Member] | Junior Subordinated Debt [Member] | Trust Preferred Securities [Member]
Debt Instrument [Line Items]
LIBOR rate						1.60%
Monroe Bancorp Statutory Trust II [Member]
Debt Instrument [Line Items]
Preferred securities									$ 5
Reference rate of the variable interest rate for preferred securities						Three-month LIBOR plus 160 basis points
Monroe Bancorp Statutory Trust II [Member] | Junior Subordinated Debt [Member] | Trust Preferred Securities [Member]
Debt Instrument [Line Items]
LIBOR rate						1.60%

Other Borrowings - Future Minim

Other Borrowings - Future Minimum Lease Payments under Capital Lease Arrangements (Detail) $ in Thousands	Dec. 31, 2016USD ($)
Debt Disclosure [Abstract]
2,017	$ 535
2,018	410
2,019	430
2,020	430
2,021	430
Thereafter	7,976
Total minimum lease payments	10,211
Less amounts representing interest	(6,119)
Present value of net minimum lease payments	$ 4,092

Income Taxes - Summary of Diffe

Income Taxes - Summary of Differences in Taxes from Continuing Operations Computed at Statutory Rate (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Provision at statutory rate of 35%									$ 70,149	$ 57,013	$ 49,688
Tax-exempt interest									(14,356)	(13,111)	(11,460)
Section 291/265 interest disallowance									191	142	93
Company-owned life insurance income									(2,968)	(3,011)	(2,423)
Tax-exempt income									(17,133)	(15,980)	(13,790)
Reserve for unrecognized tax benefits									(1)	(5)	(1,076)
State income taxes									3,461	4,173	2,676
ONB Insurance Group, Inc. nondeductible goodwill									8,328
Effect of Illinois branch sale										1,835
State statutory rate change											904
Other, net									1,358	(859)	(105)
Income tax expense	$ 14,710	$ 10,969	$ 30,812	$ 9,671	$ 11,598	$ 16,395	$ 8,959	$ 9,225	$ 66,162	$ 46,177	$ 38,297
Effective tax rate									33.00%	28.30%	27.00%

Income Taxes - Summary of Di132

Income Taxes - Summary of Differences in Taxes from Continuing Operations Computed at Statutory Rate (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Statutory rate	35.00%	35.00%	35.00%

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended			12 Months Ended
	May 31, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Line Items]
Net deferred tax assets					$ 181,863,000	$ 109,984,000
Bad debt reserves, created for tax purposes					52,800,000
Unrecognized deferred income tax liability					19,800,000
Valuation allowance recorded					0	0
Operating loss carryforwards, federal					162,900,000	1,300,000
AMT carryforwards					19,523,000	18,378,000
Federal tax credits					35,000	422,000
Operating loss carryforwards, state					206,300,000	46,300,000
Unrecognized tax benefits, if recognized, would favorably affect the effective tax rate					800,000
Interest and penalties					(100,000)	(400)	$ (1,100,000)
Interest and penalties, accrued					100,000	11,000
Uncertain tax position reversal		$ 2,000	$ 4,000	$ 3,800,000	$ 2,000	$ 4,000	$ 3,807,000
Interest portion of uncertain tax position reversal				$ 0
ONB Insurance Group, Inc. [Member]
Income Taxes [Line Items]
Additional tax expense to record deferred tax liability	$ 8,300,000
Federal Net Operating Loss [Member]
Income Taxes [Line Items]
Operating loss carryforwards, expiration date					2,027
Minimum [Member] | Federal Tax Credits [Member]
Income Taxes [Line Items]
Operating loss carryforwards, expiration date					2,027
Minimum [Member] | State Net Operating Loss [Member]
Income Taxes [Line Items]
Operating loss carryforwards, expiration date					2,023
Maximum [Member] | Federal Tax Credits [Member]
Income Taxes [Line Items]
Operating loss carryforwards, expiration date					2,035
Maximum [Member] | State Net Operating Loss [Member]
Income Taxes [Line Items]
Operating loss carryforwards, expiration date					2,035
Anchor BanCorp Wisconsin Inc [Member]
Income Taxes [Line Items]
Net increase (decrease) in deferred tax assets					$ 71,900,000
Net deferred tax assets					98,100,000
Bad debt reserves, created for tax purposes					50,900,000
Lafayette Savings Bank [Member]
Income Taxes [Line Items]
Bad debt reserves, created for tax purposes					$ 1,900,000

Income Taxes - Provision for In

Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Federal income taxes currently payable									$ 23,735	$ 17,385	$ 8,974
State income taxes currently payable									2,242	769	581
Federal income taxes deferred									35,955	24,664	27,207
State income taxes deferred									4,230	3,359	1,535
Deferred income tax expense									40,185	28,023	28,742
Income tax expense	$ 14,710	$ 10,969	$ 30,812	$ 9,671	$ 11,598	$ 16,395	$ 8,959	$ 9,225	$ 66,162	$ 46,177	$ 38,297

Income Taxes - Schedule of Sign

Income Taxes - Schedule of Significant Components of Net Deferred Tax Assets (Liabilities) (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred Tax Assets
Allowance for loan losses, net of recapture	$ 19,773	$ 17,125
Benefit plan accruals	23,846	18,066
Alternative minimum tax credit	19,523	18,378
Unrealized losses on benefit plans	205	4,507
Net operating loss carryforwards	66,917	2,041
Premises and equipment		12,735
Federal tax credits	35	422
Other-than-temporary impairment	3,606	3,558
Acquired loans	40,522	34,870
Lease exit obligation	2,060	2,626
Unrealized losses on available-for-sale investment securities	23,365	3,002
Unrealized losses on held-to-maturity investment securities	7,118	7,724
Unrealized losses on hedges	4,116	5,685
Other real estate owned	3,310
Other, net	2,675	4,914
Total deferred tax assets	217,071	135,653
Deferred Tax Liabilities
Accretion on investment securities	(700)	(599)
Other real estate owned		(284)
Purchase accounting	(17,552)	(16,615)
FDIC indemnification asset		(2,565)
Loan servicing rights	(9,627)	(3,890)
Premises and equipment	(4,800)
Other, net	(2,529)	(1,716)
Total deferred tax liabilities	(35,208)	(25,669)
Net deferred tax assets	$ 181,863	$ 109,984

Income Taxes - Summary of Recon

Income Taxes - Summary of Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Balance at January 1,				$ 124	$ 77	$ 3,847
Additions based on tax positions related to the current year				118	51	37
Additions based on tax positions related to prior years				537
Reductions due to statute of limitations expiring	$ (2)	$ (4)	$ (3,800)	(2)	(4)	(3,807)
Balance at December 31,				$ 777	$ 124	$ 77

Employee Benefit Plans - Additi

Employee Benefit Plans - Additional Information (Detail) - USD ($) shares in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Discretionary profit sharing	$ 0	$ 0	$ 0
Settlement loss	(103,000)
Benefit cost, net periodic benefit cost	263,000	167,000	154,000
Estimated net loss from restoration plan, that will be amortized into periodic costs	100,000
Accumulated benefit obligation and projected benefit obligation	1,100,000	$ 1,200,000
Expected cash contribution	$ 200,000
Contribution plan, employer matching contribution percentage	50.00%
Defined contribution plans employee contribution percentage of eligible compensation matched by employer	6.00%
Shares allocated to the employee stock ownership plan	0.8	1
Contribution expense under employee stock ownership plan	$ 5,000,000	$ 4,600,000	4,300,000
Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0
Discretionary profit sharing	7,600,000	$ 100,000	$ 300,000
Settlement loss	9,800,000
Benefit cost, net periodic benefit cost	$ 11,600,000

Employee Benefit Plans - Summar

Employee Benefit Plans - Summary of the Activity of the Restoration Plan (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit obligation, Beginning Balance	$ 1,200
Benefit obligation, Interest cost	52	$ 45	$ 52
Benefit obligation, Actuarial loss (gain)	(108)	(122)	(102)
Defined Benefit Plan, Benefit obligation, Ending Balance	1,100	1,200
Accrued benefit liability	(1,136)	(1,239)
Net amount recognized	(1,136)	(1,239)
Net actuarial loss	538	646
Amount Recognized in OCI, Total	538	646
Change in Projected Benefit Obligation [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit obligation, Beginning Balance	1,239	1,346
Benefit obligation, Interest cost	52	45
Plan Assets, Benefits paid	(39)	(65)
Benefit obligation, Actuarial loss (gain)	103	(87)
Plan Assets, Settlement	(219)
Defined Benefit Plan, Benefit obligation, Ending Balance	1,136	1,239	1,346
Change in Plan Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair value of plan assets, Beginning Balance	0	0
Plan Assets, Employer contributions	257	65
Plan Assets, Benefits paid	(39)	(65)
Plan Assets, Settlement	(218)
Defined Benefit Plan, Fair value of plan assets, Ending Balance	0	0	$ 0
Funded status at December 31	$ (1,136)	$ (1,239)

Employee Benefit Plans - Schedu

Employee Benefit Plans - Schedule of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Benefit Cost, Interest cost	$ 52	$ 45	$ 52
Benefit Cost, Recognized actuarial loss	108	122	102
Benefit Cost, Net periodic benefit cost	160	167	154
Benefit Cost, Settlement loss	103
Total net periodic benefit cost	263	167	154
Other Changes, Net actuarial (gain)/loss	103	(87)	145
Other Changes, Amortization of net actuarial loss	(108)	(122)	(102)
Other Changes, Settlement loss	(103)
Total recognized in other comprehensive income	(108)	(209)	43
Total recognized in net periodic benefit cost and other comprehensive income	$ 155	$ (42)	$ 197

Employee Benefit Plans - Assump

Employee Benefit Plans - Assumptions Used in Determining the Benefit Obligation and Net Periodic Benefit Expense Income (Detail)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Benefit obligations, Discount rate at the end of the period	4.00%	4.50%	4.00%
Net periodic benefit cost, Discount rate at the beginning of the period	4.50%	4.00%	4.75%
Rate of compensation increase	0.00%	0.00%	0.00%

Employee Benefit Plans - Expect

Employee Benefit Plans - Expected Benefit Payments (Detail) $ in Thousands	Dec. 31, 2016USD ($)
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
2,017	$ 210
2,018	18
2,019	230
2,020	21
2,021	52
Years 2022 - 2026	$ 610

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Jan. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares available for issuance	4,900,000
Stock based compensation expense	$ 7,300,000	$ 4,300,000	$ 4,200,000
Total income tax benefit, stock-based compensation cost	$ 2,800,000	$ 1,600,000	1,600,000
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation awards, vesting period	3 years
Unrecognized compensation expense	$ 2,700,000
Expected weighted-average period for cost recognition (in years)	1 year 8 months 12 days
Stock appreciation rights, Outstanding	821,000	840,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term, in years	10 years
Stock Options [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation awards, vesting period	3 years
Stock Options [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation awards, vesting period	5 years
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation awards, vesting period	3 years
Unrecognized compensation expense	$ 3,400,000
Expected weighted-average period for cost recognition (in years)	1 year 10 months 24 days
Total fair value of shares vested	$ 3,800,000	$ 1,600,000	$ 1,300,000
Stock appreciation rights, Outstanding	401,000	346,000
Stock Appreciation Rights (SARs) [Member] | Old National Bancorp [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock appreciation rights, Outstanding	100,000
Incremental expense associated with conversion of stock appreciation rights	$ 0
Outside Director Stock Compensation Program [Member] | Amended and Restated 2008 Incentive Compensation Plan [Member] | Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, issued				35,000

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary of Changes in the Nonvested Restricted Shares (Detail) - Restricted Stock [Member] shares in Thousands	12 Months Ended
	Dec. 31, 2016$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested shares, Beginning balance | shares	346
Nonvested shares, Granted, Number Outstanding | shares	348
Nonvested shares, Vested, Number Outstanding | shares	(289)
Nonvested shares, Forfeited, Number Outstanding | shares	(4)
Nonvested shares, Ending balance | shares	401
Nonvested shares, Weighted Average Grant-Date Fair Value, Beginning of Period | $ / shares	$ 13.90
Nonvested shares, Granted, Weighted Average Grant-Date Fair Value | $ / shares	12.77
Nonvested shares, Vested, Weighted Average Grant-Date Fair Value | $ / shares	13.36
Nonvested shares, Forfeited, Weighted Average Grant-Date Fair Value | $ / shares	13.26
Nonvested shares, Weighted Average Grant-Date Fair Value, Ending of Period | $ / shares	$ 13.31

Stock-Based Compensation - S144

Stock-Based Compensation - Summary of Changes in the Nonvested Restricted Shares (Parenthetical) (Detail) - Restricted Stock [Member] - shares shares in Thousands	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issuable in conjunction with acquisition	401	346
Anchor BanCorp Wisconsin Inc [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issuable in conjunction with acquisition	173

Stock-Based Compensation - S145

Stock-Based Compensation - Summary of Changes in the Nonvested Restricted Stock Units (Detail) - Restricted Stock Units [Member] shares in Thousands	12 Months Ended
	Dec. 31, 2016$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested shares, Beginning balance | shares	840
Nonvested shares, Granted, Number Outstanding | shares	279
Nonvested shares, Vested, Number Outstanding | shares	(16)
Nonvested shares, Forfeited, Number Outstanding | shares	(295)
Nonvested Shares,dividend equivalents adjustment, Number Outstanding | shares	13
Nonvested shares, Ending balance | shares	821
Nonvested shares, Weighted Average Grant-Date Fair Value, Beginning of Period | $ / shares	$ 12.56
Nonvested shares, Granted, Weighted Average Grant-Date Fair Value | $ / shares	10.17
Nonvested shares, Vested, Weighted Average Grant-Date Fair Value | $ / shares	13.04
Nonvested shares, Forfeited, Weighted Average Grant-Date Fair Value | $ / shares	11.84
Nonvested shares, dividend equivalents adjustment, Weighted Average Grant-Date Fair Value | $ / shares	11.05
Nonvested shares, Weighted Average Grant-Date Fair Value, Ending of Period | $ / shares	$ 12.02

Stock-Based Compensation - S146

Stock-Based Compensation - Summary of the Activity in the Stock Option Plan (Detail) $ / shares in Units, shares in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)$ / sharesshares
Stock Based Compensation [Abstract]
Outstanding, Shares, Beginning Balance | shares	1,043
Exercised, Shares | shares	(191)
Forfeited/expired, Shares | shares	(158)
Outstanding, Shares, Ending Balance | shares	694
Options exercisable at end of year, Shares | shares	694
Weighted Average Exercise Price, Beginning of Period | $ / shares	$ 16.16
Exercised, Weighted Average Exercise Price | $ / shares	12.83
Forfeited/expired, Weighted Average Exercise Price | $ / shares	24.09
Weighted Average Exercise Price, End of Period | $ / shares	15.27
Options exercisable at end of year, Weighted Average Exercise Price | $ / shares	$ 15.27
Weighted Average Remaining Contractual Term in Years, End of Period	1 year 3 months 29 days
Options exercisable at end of year, Weighted Average Remaining Contractual Terms in Years	1 year 3 months 29 days
Aggregate Intrinsic Value, End of Period | $	$ 2,460,100
Options exercisable at end of year, Aggregate Intrinsic Value | $	$ 2,460,100

Stock-Based Compensation - Sche

Stock-Based Compensation - Schedule of Information Related to the Stock Option Plan (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Stock Based Compensation [Abstract]
Intrinsic value of options exercised	$ 660	$ 458	$ 432
Cash received from option exercises	2,349	997	1,002
Tax benefit realized from option exercises	$ 264	$ 159	$ 97

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Aug. 16, 2012
Shareholders' Equity [Line Items]
Authorized and unissued common shares available for issuance	300,000,000	300,000,000
Common shares purchase price as percentage of fair market value	95.00%
Maximum value of shares purchased as percentage of employee compensation	10.00%
Common stock issued	$ 388,000	$ 391,000	$ 326,000
Dividend Reinvestment and Stock Purchase Plan [Member]
Shareholders' Equity [Line Items]
Authorized and unissued common shares available for issuance	3,300,000			3,300,000
Employee Stock Purchase Plan [Member]
Shareholders' Equity [Line Items]
Number of shares available for purchase, maximum	500,000
Shares issued related to dividend reinvestment and stock purchase plan	32,000	29,000
Common stock issued	$ 388,000	$ 391,000

Fair Value - Schedule of Fair V

Fair Value - Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	$ 4,982	$ 3,941
Investment securities available-for-sale	2,797,174	2,418,221
Derivative assets	17,701	15,925
Derivative liabilities	23,574	26,968
U.S. Treasury [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities available-for-sale	7,103	12,150
U.S. Government-Sponsored Entities and Agencies [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities available-for-sale	493,956	613,550
Mortgage-Backed Securities - Agency [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities available-for-sale	1,525,019	1,066,361
States and Political Subdivisions [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities available-for-sale	436,684	387,296
Pooled Trust Preferred Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities available-for-sale	8,119	7,900
Other Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities available-for-sale	326,293	330,964
Estimate of Fair Value Measurement [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	4,982	3,941
Estimate of Fair Value Measurement [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Residential loans held for sale	90,682	13,810
Derivative assets	17,701	15,925
Derivative liabilities	23,574	26,968
Estimate of Fair Value Measurement [Member] | U.S. Treasury [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities available-for-sale	7,103	12,150
Estimate of Fair Value Measurement [Member] | U.S. Government-Sponsored Entities and Agencies [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities available-for-sale	493,956	613,550
Estimate of Fair Value Measurement [Member] | Mortgage-Backed Securities - Agency [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities available-for-sale	1,525,019	1,066,361
Estimate of Fair Value Measurement [Member] | States and Political Subdivisions [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities available-for-sale	436,684	387,296
Estimate of Fair Value Measurement [Member] | Pooled Trust Preferred Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities available-for-sale	8,119	7,900
Estimate of Fair Value Measurement [Member] | Other Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities available-for-sale	30,905	31,443
Estimate of Fair Value Measurement [Member] | Other Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities available-for-sale	295,388	299,521
Carrying Value [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	4,982	3,941
Residential loans held for sale	90,682	13,810
Derivative assets	17,701	15,925
Derivative liabilities	23,574	26,968
Carrying Value [Member] | U.S. Treasury [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities available-for-sale	7,103	12,150
Carrying Value [Member] | U.S. Government-Sponsored Entities and Agencies [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities available-for-sale	493,956	613,550
Carrying Value [Member] | Mortgage-Backed Securities - Agency [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities available-for-sale	1,525,019	1,066,361
Carrying Value [Member] | States and Political Subdivisions [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities available-for-sale	436,684	387,296
Carrying Value [Member] | Pooled Trust Preferred Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities available-for-sale	8,119	7,900
Carrying Value [Member] | Other Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities available-for-sale	$ 326,293	$ 330,964

Fair Value - Reconciliation of

Fair Value - Reconciliation of All Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Accretion of discount	$ 18	$ 18
Significant Unobservable Inputs (Level 3) [Member] | Pooled Trust Preferred Securities Available-for-Sale [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	7,900	6,607
Accretion of discount	18	18
Sales/payments received	(327)	(663)
Increase in fair value of securities	528	1,938
Ending balance	$ 8,119	7,900
Significant Unobservable Inputs (Level 3) [Member] | States and Political Subdivisions [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		325
Matured securities		$ (325)

Fair Value - Additional Informa

Fair Value - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Accretion of discounts on securities included in interest income	$ 18	$ 18
Net carrying amount other real estate owned and other repossessed property		2,700
Other real estate owned property write-downs	$ 3,000	2,200
Past due period of mortgage loans held for sale, days	90 days
Interest income for residential loans held for sale	$ 100	100
Valuation Allowance, Real Estate Owned [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net carrying amount other real estate owned and other repossessed property	1,700
Impaired Commercial and Commercial Real Estate Loans [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Principal amount of impaired commercial and commercial real estate loans	26,400	36,800
Valuation allowance	8,000	11,500
Recapture of provision loan	$ 1,100
Provision for loan losses expensed		$ 4,700

Fair Value - Quantitative Infor

Fair Value - Quantitative Information about Significant Unobservable Inputs Used in Fair Value Measurements (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount for type of property, age of appraisal and current status	13.00%	11.00%
Commercial Loan [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 6,771	$ 13,332
Valuation Techniques	Fair value of collateral
Commercial Real Estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 11,632	$ 11,857
Valuation Techniques	Fair value of collateral
Minimum [Member] | Commercial Loan [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount for type of property, age of appraisal and current status	0.00%	0.00%
Minimum [Member] | Commercial Real Estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount for type of property, age of appraisal and current status	10.00%	0.00%
Maximum [Member] | Commercial Loan [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount for type of property, age of appraisal and current status	99.00%	86.00%
Maximum [Member] | Commercial Real Estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount for type of property, age of appraisal and current status	67.00%	61.00%
Weighted Average [Member] | Commercial Loan [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount for type of property, age of appraisal and current status	53.00%	28.00%
Weighted Average [Member] | Commercial Real Estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount for type of property, age of appraisal and current status	36.00%	33.00%
Pooled Trust Preferred Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 8,119	$ 7,900
Valuation Techniques	Discounted cash flow
Pooled Trust Preferred Securities [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Additional asset defaults	4.50%	4.10%
Expected asset recoveries	0.00%	0.00%
Pooled Trust Preferred Securities [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Additional asset defaults	10.00%	11.50%
Expected asset recoveries	6.10%	11.50%
Pooled Trust Preferred Securities [Member] | Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Additional asset defaults	7.90%	8.10%
Expected asset recoveries	0.90%	3.10%
Commercial Real Estate Foreclosed Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 1,352	$ 2,526
Valuation Techniques	Fair value of collateral
Commercial Real Estate Foreclosed Assets [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount for type of property, age of appraisal and current status	4.00%	3.00%
Commercial Real Estate Foreclosed Assets [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount for type of property, age of appraisal and current status	80.00%	80.00%
Commercial Real Estate Foreclosed Assets [Member] | Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount for type of property, age of appraisal and current status	39.00%	26.00%
Residential Foreclosed Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 394	$ 203
Valuation Techniques	Fair value of collateral
Residential Foreclosed Assets [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount for type of property, age of appraisal and current status	7.00%	7.00%
Residential Foreclosed Assets [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount for type of property, age of appraisal and current status	60.00%	53.00%
Residential Foreclosed Assets [Member] | Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount for type of property, age of appraisal and current status	30.00%	29.00%

Fair Value - Quantitative In153

Fair Value - Quantitative Information about Significant Unobservable Inputs Used in Fair Value Measurements (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percentage of adjusted specific issuer evaluation defaults	100.00%	100.00%
Percentage of adjusted specific issuer evaluation recoveries	100.00%	100.00%
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percentage of adjusted specific issuer evaluation defaults	0.00%	0.00%
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percentage of adjusted specific issuer evaluation defaults	50.00%	50.00%
Pooled Trust Preferred Securities [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percentage of adjusted specific issuer evaluation recoveries	0.00%	0.00%
Pooled Trust Preferred Securities [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percentage of adjusted specific issuer evaluation recoveries	25.00%	25.00%

Fair Value - Assets Measured at

Fair Value - Assets Measured at Fair Value on a Non-Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Commercial Loan [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 6,771	$ 13,332
Commercial Real Estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	11,632	11,857
Commercial Real Estate Foreclosed Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	1,352	2,526
Residential Foreclosed Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	394	203
Significant Unobservable Inputs (Level 3) [Member] | Commercial Loan [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	6,771	13,332
Significant Unobservable Inputs (Level 3) [Member] | Commercial Real Estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	11,632	11,857
Significant Unobservable Inputs (Level 3) [Member] | Commercial Real Estate Foreclosed Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	1,352	2,526
Significant Unobservable Inputs (Level 3) [Member] | Residential Foreclosed Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 394	$ 203

Fair Value - Schedule of Differ

Fair Value - Schedule of Difference between the Aggregate Fair Value and the Aggregate Remaining Principal Balance (Detail) - Residential Loans Held for Sale [Member] - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Aggregate Fair Value	$ 90,682	$ 13,810
Difference	133	236
Contractual Principal	$ 90,549	$ 13,574

Fair Value - Changes in Fair Va

Fair Value - Changes in Fair Value for Items Measured at Fair Value Pursuant to Election of the Fair Value (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule of Trading Securities and Other Trading Assets [Line Items]
Interest Income	$ 109,917	$ 107,803	$ 99,340	$ 85,643	$ 85,922	$ 97,104	$ 92,097	$ 90,993	$ 402,703	$ 366,116	$ 366,370
Interest (Expense)	$ (11,932)	$ (11,910)	$ (10,903)	$ (9,686)	$ (9,038)	$ (8,567)	$ (7,867)	$ (7,601)	(44,431)	(33,073)	$ (23,359)
Residential Loans Held for Sale [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other Gains and (Losses)									(103)	(140)
Interest Income									0	0
Interest (Expense)									0	0
Total Changes in Fair Values Included in Current Period Earnings									$ (103)	$ (140)

Fair Value - Carrying Amounts a

Fair Value - Carrying Amounts and Estimated Fair Values of Financial Instruments, Not Previously Presented (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash, due from banks, federal funds sold, and money market investments	$ 255,519	$ 219,818	$ 239,963	$ 206,723
Investment securities - held-to-maturity	745,090	872,111
Federal Home Loan Bank/Federal Reserve Bank stock	101,716	86,146
FDIC indemnification asset		9,030	$ 20,603
Accrued interest receivable	81,381	69,098
Noninterest-bearing demand deposits	3,016,093	2,488,855
Time deposits	1,468,108	1,000,067
Federal funds purchased and interbank borrowings	213,003	291,090
Securities sold under agreements to repurchase	367,052	387,409
Other borrowings	1,353,092	1,023,491
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash, due from banks, federal funds sold, and money market investments	255,519	219,818
Accrued interest receivable	16	29
Noninterest-bearing demand deposits	3,016,093	2,488,855
NOW, savings, and money market deposits	6,259,052	4,911,938
Federal funds purchased and interbank borrowings	213,003	291,090
Securities sold under agreements to repurchase	317,052	337,409
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Accrued interest receivable	22,880	22,821
Time deposits	1,460,778	998,878
Securities sold under agreements to repurchase	50,612	51,370
Other borrowings	217,647	201,138
Accrued interest payable	5,979	4,859
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commercial	1,971,296	1,829,824
Commercial real estate	3,400,365	1,946,163
Residential real estate	2,228,542	1,745,248
Consumer credit	1,974,180	1,587,879
FDIC indemnification asset		5,700
Accrued interest receivable	58,485	46,248
Federal Home Loan Bank advances	1,360,599	1,029,779
Standby letters of credit	315	429
Commitments to extend credit	2,527	2,364
U.S. Government-Sponsored Entities and Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - held-to-maturity	40,131	142,864
U.S. Government-Sponsored Entities and Agencies [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - held-to-maturity	40,558	145,763
Mortgage-Backed Securities - Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - held-to-maturity	10,640	16,042
Mortgage-Backed Securities - Agency [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - held-to-maturity	10,940	16,604
States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - held-to-maturity	694,319	713,205
States and Political Subdivisions [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - held-to-maturity	732,674	767,050
Carrying Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash, due from banks, federal funds sold, and money market investments	255,519	219,818
Federal Home Loan Bank/Federal Reserve Bank stock	101,716	86,146
Commercial	1,895,618	1,788,593
Commercial real estate	3,112,680	1,852,979
Residential real estate	2,085,887	1,659,284
Consumer credit	1,866,519	1,595,316
FDIC indemnification asset		9,030
Accrued interest receivable	81,381	69,098
Noninterest-bearing demand deposits	3,016,093	2,488,855
NOW, savings, and money market deposits	6,259,052	4,911,938
Time deposits	1,468,108	1,000,067
Federal funds purchased and interbank borrowings	213,003	291,090
Securities sold under agreements to repurchase	367,052	387,409
Federal Home Loan Bank advances	1,353,092	1,023,491
Other borrowings	218,939	218,256
Accrued interest payable	5,979	4,859
Standby letters of credit	315	429
Carrying Value [Member] | U.S. Government-Sponsored Entities and Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - held-to-maturity	40,131	142,864
Carrying Value [Member] | Mortgage-Backed Securities - Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - held-to-maturity	10,640	16,042
Carrying Value [Member] | States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - held-to-maturity	$ 694,319	$ 713,205

Derivative Financial Instrum158

Derivative Financial Instruments - Additional Information (Detail) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Notional amount	$ 660,000,000				$ 761,500,000					$ 660,000,000	$ 761,500,000
Reclassified interest income (expense)	109,917,000	$ 107,803,000	$ 99,340,000	$ 85,643,000	85,922,000	$ 97,104,000	$ 92,097,000	$ 90,993,000		402,703,000	366,116,000	$ 366,370,000
Scenario, Forecast [Member] | Reclassifications out of Accumulated Other Comprehensive Income (Loss) [Member] | Interest Income [Member]
Derivative [Line Items]
Reclassified interest income (expense)									$ 300,000
Scenario, Forecast [Member] | Reclassifications out of Accumulated Other Comprehensive Income (Loss) [Member] | Interest Expense [Member]
Derivative [Line Items]
Reclassified interest income (expense)									$ (6,100,000)
Fixed Interest Swap [Member]
Derivative [Line Items]
Notional amount	35,000,000				36,500,000					35,000,000	36,500,000
Variable Interest Rate Swap [Member]
Derivative [Line Items]
Notional amount	625,000,000				675,000,000					625,000,000	675,000,000
Receive Fixed Pay Floating Interest Rate Swaps [Member]
Derivative [Line Items]
Notional amount	0				50,000,000					0	50,000,000
Interest Rate Lock Commitments [Member]
Derivative [Line Items]
Notional amount	40,300,000				30,400,000					40,300,000	30,400,000
Forward Commitments [Member]
Derivative [Line Items]
Notional amount	86,100,000				33,300,000					86,100,000	33,300,000
Customer Derivative Instrument [Member]
Derivative [Line Items]
Notional amount	582,700,000				428,400,000					582,700,000	428,400,000
Offsetting Counter Party Derivative Instrument [Member]
Derivative [Line Items]
Notional amount	$ 582,700,000				$ 428,400,000					$ 582,700,000	$ 428,400,000

Derivative Financial Instrum159

Derivative Financial Instruments - Summary of Fair Value of Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Total derivative assets	$ 17,701	$ 15,925
Total derivative liabilities	23,574	26,968
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Total derivative assets	3,056	3,794
Total derivative liabilities	11,582	15,554
Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Total derivative assets	3,056	3,794
Total derivative liabilities	11,582	15,554
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Total derivative assets	14,645	12,131
Total derivative liabilities	11,992	11,414
Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Total derivative assets	11,903	11,296
Total derivative liabilities	11,992	11,414
Not Designated as Hedging Instrument [Member] | Mortgage Contracts [Member]
Derivative [Line Items]
Total derivative assets	$ 2,742	$ 835

Derivative Financial Instrum160

Derivative Financial Instruments - Schedule of Effect of Derivative Instruments on the Consolidated Statements of Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative	$ 1,418	$ 186	$ 340
Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative	(5,320)	(1,540)	1,277
Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative	329	511	246
Interest Rate Contracts [Member] | Interest Income / (Expense) [Member] | Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative	(5,446)	(1,729)	1,002
Interest Rate Contracts [Member] | Interest Income / (Expense) [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative	329	511	246
Interest Rate Contracts [Member] | Other Income / (Expense) [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative	28	18	88
Interest Rate Contracts [Member] | Other Income / (Expense) [Member] | Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative	126	189	275
Mortgage Contracts [Member] | Mortgage Banking Revenue [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative	$ 1,390	$ 168	$ 252

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Loan commitments	$ 2,354	$ 1,746
Fixed rate loan commitment	2,207
Floating rate loan commitment	146.5
Standby letters of credit	$ 51.7	62.6
Loan commitments floating rate, minimum	0.00%
Loan commitments floating rate, maximum	25.00%
Allowance for unfunded loan commitments	$ 3.2	3.6
Extended credit	13.3	14.5
Credit extensions with collateral	$ 12.6	$ 13.6

Financial Guarantees - Addition

Financial Guarantees - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Financial Guarantees [Line Items]
Term of standby letters of credit, years	1 year
Notional amount of standby letters of credit	$ 51,700,000	$ 62,600,000
Carrying value of letters of credit	300,000	400,000
Notional amount	660,000,000	$ 761,500,000
Interest Rate Swap [Member] | 2007 Interest Rate Swap Purchase [Member]
Financial Guarantees [Line Items]
Notional amount	6,800,000
Interest Rate Swap [Member] | 2014 Interest Rate Swap Purchase [Member]
Financial Guarantees [Line Items]
Notional amount	$ 9,900,000

Regulatory Restrictions - Addit

Regulatory Restrictions - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Maturities of Time Deposits [Abstract]
Reserve balances	$ 85.4	$ 68.4
Cash and due from banks held as collateral	$ 3.5	$ 0.2
Dividend approval threshold, years	2 years

Regulatory Restrictions - Sched

Regulatory Restrictions - Schedule of Capital Ratios (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Old National Bancorp [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital to risk-weighted assets Actual, Amount	$ 1,229,878	$ 1,024,586
Common equity Tier 1 capital to risk-weighted assets Actual, Amount	1,162,817	934,497
Tier 1 capital to risk-weighted assets Actual, Amount	1,176,849	968,772
Tier 1 capital to average assets Actual, Amount	$ 1,176,849	$ 968,772
Total capital to risk-weighted assets Actual, Ratio	12.18%	13.28%
Common equity Tier 1 capital to risk-weighted assets Actual, Ratio	11.51%	12.11%
Tier 1 capital to risk-weighted assets Actual, Ratio	11.65%	12.55%
Tier 1 capital to average assets Actual, Ratio	8.43%	8.54%
Total capital to risk-weighted assets Fully Phased-In Regulatory Guidelines Minimum, Amount	$ 1,060,662	$ 810,397
Common equity Tier 1 capital to risk-weighted assets Fully Phased-In Regulatory Guidelines Minimum, Amount	707,108	540,265
Tier 1 capital to risk-weighted assets Fully Phased-In Regulatory Guidelines Minimum, Amount	858,631	656,036
Tier 1 capital to average assets Fully Phased-In Regulatory Guidelines Minimum, Amount	$ 558,673	$ 454,005
Total capital to risk-weighted assets Fully Phased-In Regulatory Guidelines Minimum, Ratio	10.50%	10.50%
Common equity Tier 1 capital to risk-weighted assets Fully Phased-In Regulatory Guidelines Minimum, Ratio	7.00%	7.00%
Tier 1 capital to risk-weighted assets Fully Phased-In Regulatory Guidelines Minimum, Ratio	8.50%	8.50%
Tier 1 capital to average assets Fully Phased-In Regulatory Guidelines Minimum, Ratio	4.00%	4.00%
Old National Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital to risk-weighted assets Actual, Amount	$ 1,240,180	$ 1,079,652
Common equity Tier 1 capital to risk-weighted assets Actual, Amount	1,187,151	1,023,839
Tier 1 capital to risk-weighted assets Actual, Amount	1,187,151	1,023,839
Tier 1 capital to average assets Actual, Amount	$ 1,187,151	$ 1,023,839
Total capital to risk-weighted assets Actual, Ratio	12.35%	14.11%
Common equity Tier 1 capital to risk-weighted assets Actual, Ratio	11.82%	13.38%
Tier 1 capital to risk-weighted assets Actual, Ratio	11.82%	13.38%
Tier 1 capital to average assets Actual, Ratio	8.55%	9.11%
Total capital to risk-weighted assets Fully Phased-In Regulatory Guidelines Minimum, Amount	$ 1,054,305	$ 803,490
Common equity Tier 1 capital to risk-weighted assets Fully Phased-In Regulatory Guidelines Minimum, Amount	702,870	535,660
Tier 1 capital to risk-weighted assets Fully Phased-In Regulatory Guidelines Minimum, Amount	853,485	650,445
Tier 1 capital to average assets Fully Phased-In Regulatory Guidelines Minimum, Amount	$ 555,161	$ 449,791
Total capital to risk-weighted assets Fully Phased-In Regulatory Guidelines Minimum, Ratio	10.50%	10.50%
Common equity Tier 1 capital to risk-weighted assets Fully Phased-In Regulatory Guidelines Minimum, Ratio	7.00%	7.00%
Tier 1 capital to risk-weighted assets Fully Phased-In Regulatory Guidelines Minimum, Ratio	8.50%	8.50%
Tier 1 capital to average assets Fully Phased-In Regulatory Guidelines Minimum, Ratio	4.00%	4.00%
Total capital to risk-weighted assets Well Capitalized Guidelines, Amount	$ 1,004,100	$ 765,229
Common equity Tier 1 capital to risk-weighted assets Well Capitalized Guidelines, Amount	652,665	497,399
Tier 1 capital to risk-weighted assets Well Capitalized Guidelines, Amount	803,280	612,183
Tier 1 capital to average assets Well Capitalized Guidelines, Amount	$ 693,951	$ 562,239
Total capital to risk-weighted assets Well Capitalized Guidelines, Ratio	10.00%	10.00%
Common equity Tier 1 capital to risk-weighted assets Well Capitalized Guidelines, Ratio	6.50%	6.50%
Tier 1 capital to risk-weighted assets Well Capitalized Guidelines, Ratio	8.00%	8.00%
Tier 1 capital to average assets Well Capitalized Guidelines, Ratio	5.00%	5.00%

Regulatory Restrictions - Sc165

Regulatory Restrictions - Schedule of Capital Ratios (Parenthetical) (Detail) - Basel III Capital Rules [Member]	12 Months Ended
	Dec. 31, 2016
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital conservation buffer	2.50%
Capital conservation buffer	2.50%
Capital conservation buffer	2.50%
Minimum [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital to risk-weighted assets Actual, Ratio	8.00%
Common equity Tier 1 capital to risk-weighted assets Actual, Ratio	4.50%
Tier 1 capital to risk-weighted assets Actual, Ratio	6.00%
Tier 1 capital to average assets Fully Phased-In Regulatory Guidelines Minimum, Ratio	4.00%

Parent Company Financial Sta166

Parent Company Financial Statements - Condensed Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Assets
Trading securities - at fair value	$ 4,982	$ 3,941
Other assets	115,776	106,639
Total assets	14,860,237	11,991,527
Liabilities and Shareholders' Equity
Other borrowings	218,939	218,256
Shareholders' equity	1,814,417	1,491,170	$ 1,465,764	$ 1,162,640
Total liabilities and shareholders' equity	14,860,237	11,991,527
Old National Bancorp [Member]
Assets
Deposits in affiliate bank	91,650	48,000
Trading securities - at fair value	4,982	3,941
Investment securities - available-for-sale	1,535	1,452
Investment in affiliates, Banking subsidiaries	1,862,244	1,551,924
Investment in affiliates, Non-banks	11,388	49,083
Other assets	90,872	84,598
Total assets	2,062,671	1,738,998
Liabilities and Shareholders' Equity
Other liabilities	33,407	33,608
Other borrowings	214,847	214,220
Shareholders' equity	1,814,417	1,491,170
Total liabilities and shareholders' equity	$ 2,062,671	$ 1,738,998

Parent Company Financial Sta167

Parent Company Financial Statements - Condensed Statements of Income (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income
Net securities gains									$ 5,848	$ 5,718	$ 9,830
Expense
Interest on borrowings	$ 11,932	$ 11,910	$ 10,903	$ 9,686	$ 9,038	$ 8,567	$ 7,867	$ 7,601	44,431	33,073	23,359
Other expenses									28,715	30,974	16,199
Income before income taxes	48,166	45,678	69,934	36,648	43,583	54,064	35,115	30,131	200,426	162,893	141,964
Income tax expense (benefit)	14,710	10,969	30,812	9,671	11,598	16,395	8,959	9,225	66,162	46,177	38,297
Net income	$ 33,456	$ 34,709	$ 39,122	$ 26,977	$ 31,985	$ 37,669	$ 26,156	$ 20,906	134,264	116,716	103,667
Old National Bancorp [Member]
Income
Dividends from affiliates									160,007	67,717	65,292
Net securities gains									100	6	170
Other income									40,841	1,892	1,554
Other income from affiliates									6	51	79
Total income									200,954	69,666	67,095
Expense
Interest on borrowings									9,077	8,684	3,837
Other expenses									18,460	13,957	11,357
Total expense									27,537	22,641	15,194
Income before income taxes									173,417	47,025	51,901
Income tax expense (benefit)									11,952	(5,473)	(4,020)
Income before equity in undistributed earnings of affiliates									161,465	52,498	55,921
Equity in undistributed earnings of affiliates									(27,201)	64,218	47,746
Net income									$ 134,264	$ 116,716	$ 103,667

Parent Company Financial Sta168

Parent Company Financial Statements - Condensed Statement of Cash Flows (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash Flows From Operating Activities
Net income	$ 33,456	$ 34,709	$ 39,122	$ 26,977	$ 31,985	$ 37,669	$ 26,156	$ 20,906	$ 134,264	$ 116,716	$ 103,667
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation									16,558	14,101	12,366
Gain on sale of ONB Insurance Group, Inc.									(41,864)
Stock compensation expense									7,318	4,255	4,162
(Increase) decrease in other assets									46,462	16,079	19,309
Increase (decrease) in other liabilities									(24,524)	(26,408)	14,392
Total adjustments									(52,213)	7,040	95,682
Net cash flows provided by operating activities									82,051	123,756	199,349
Cash Flows From Investing Activities
Proceeds from sale of ONB Insurance Group, Inc.									91,771
Purchases of investment securities									(1,625,746)	(832,419)	(568,993)
Purchases of premises and equipment									(224,659)	(85,661)	(20,473)
Net cash flows used in investing activities									(698,003)	(500,896)	(162,163)
Cash Flows From Financing Activities
Proceeds from issuance of other borrowings											175,000
Cash dividends paid on common stock									(67,536)	(55,552)	(48,181)
Common stock repurchased									(2,044)	(88,695)	(25,830)
Proceeds from exercise of stock options, including tax benefit									2,349	997	749
Common stock issued									388	391	326
Net cash flows provided by (used in) financing activities									651,653	356,995	(3,946)
Net increase (decrease) in cash and cash equivalents									35,701	(20,145)	33,240
Cash and cash equivalents at beginning of period				219,818				239,963	219,818	239,963	206,723
Cash and cash equivalents at end of period	255,519				219,818				255,519	219,818	239,963
Old National Bancorp [Member]
Cash Flows From Operating Activities
Net income									134,264	116,716	103,667
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation									29	20	11
Net securities gains									(100)	(6)	(270)
Gain on sale of ONB Insurance Group, Inc.									(41,864)
Stock compensation expense									7,318	4,255	4,162
(Increase) decrease in other assets									(3,958)	6,307	20,040
Increase (decrease) in other liabilities									(225)	1,441	286
Equity in undistributed earnings of affiliates									27,201	(64,218)	(47,746)
Total adjustments									(11,599)	(52,201)	(23,517)
Net cash flows provided by operating activities									122,665	64,515	80,150
Cash Flows From Investing Activities
Net cash and cash equivalents of acquisitions									(100,220)	(41,070)	(82,975)
Proceeds from sale of ONB Insurance Group, Inc.									91,771
Purchases of investment securities									(52)	(1,053)	(45)
Net advances to affiliates									(3,500)		(3,832)
Purchases of premises and equipment									(13)		(1,032)
Net cash flows used in investing activities									(12,014)	(42,123)	(87,884)
Cash Flows From Financing Activities
Proceeds from issuance of other borrowings											173,500
Cash dividends paid on common stock									(67,536)	(55,552)	(48,181)
Common stock repurchased									(2,202)	(88,695)	(25,830)
Proceeds from exercise of stock options, including tax benefit									2,349	997	749
Common stock issued									388	391	326
Net cash flows provided by (used in) financing activities									(67,001)	(142,859)	100,564
Net increase (decrease) in cash and cash equivalents									43,650	(120,467)	92,830
Cash and cash equivalents at beginning of period				$ 48,000				$ 168,467	48,000	168,467	75,637
Cash and cash equivalents at end of period	$ 91,650				$ 48,000				$ 91,650	$ 48,000	$ 168,467

Segment Information - Additiona

Segment Information - Additional Information (Detail) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016USD ($)	Sep. 30, 2016USD ($)	Jun. 30, 2016USD ($)	Mar. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Sep. 30, 2015USD ($)	Jun. 30, 2015USD ($)	Mar. 31, 2015USD ($)	Dec. 31, 2016USD ($)Segment	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Segment Reporting Information [Line Items]
Net income	$ 33,456	$ 34,709	$ 39,122	$ 26,977	$ 31,985	$ 37,669	$ 26,156	$ 20,906	$ 134,264	$ 116,716	$ 103,667
Total assets	$ 14,860,237				11,991,527				$ 14,860,237	11,991,527
Number of reportable operating segment | Segment									2
Community Banking Segment [Member]
Segment Reporting Information [Line Items]
Number of reportable operating segment | Segment									1
Insurance Segments [Member]
Segment Reporting Information [Line Items]
Net income										2,100
Total assets					$ 61,800					$ 61,800

Interim Financial Data (Unau170

Interim Financial Data (Unaudited) - Interim Financial Data (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Data [Abstract]
Interest income	$ 121,849	$ 119,713	$ 110,243	$ 95,329	$ 94,960	$ 105,671	$ 99,964	$ 98,594	$ 447,134	$ 399,189	$ 389,729
Interest expense	11,932	11,910	10,903	9,686	9,038	8,567	7,867	7,601	44,431	33,073	23,359
Net interest income	109,917	107,803	99,340	85,643	85,922	97,104	92,097	90,993	402,703	366,116	366,370
Provision for loan losses	(1,756)	1,306	1,319	91	484	167	2,271	1	960	2,923	3,097
Noninterest income	62,751	47,243	93,385	49,451	60,614	59,744	54,979	55,295	252,830	230,632	165,129
Noninterest expense	126,258	108,062	121,472	98,355	102,469	102,617	109,690	116,156	454,147	430,932	386,438
Income before income taxes	48,166	45,678	69,934	36,648	43,583	54,064	35,115	30,131	200,426	162,893	141,964
Income tax expense	14,710	10,969	30,812	9,671	11,598	16,395	8,959	9,225	66,162	46,177	38,297
Net income	$ 33,456	$ 34,709	$ 39,122	$ 26,977	$ 31,985	$ 37,669	$ 26,156	$ 20,906	$ 134,264	$ 116,716	$ 103,667
Net income per share, Basic	$ 0.25	$ 0.25	$ 0.31	$ 0.24	$ 0.28	$ 0.33	$ 0.22	$ 0.18	$ 1.05	$ 1.01	$ 0.96
Net income per share, Diluted	$ 0.25	$ 0.25	$ 0.31	$ 0.24	$ 0.27	$ 0.33	$ 0.22	$ 0.18	$ 1.05	$ 1	$ 0.95
Average shares, Basic	134,670	134,492	127,508	113,998	114,103	114,590	115,732	118,540	127,705	115,726	107,818
Average shares, Diluted	135,383	135,011	127,973	114,563	114,716	115,153	116,223	119,076	128,301	116,255	108,365