Old National Bancorp (ONB) 10-K25 Feb 152014 FY Annual reportFinancial data

Company Profile

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
Document and Entity Information (USD $)	Dec. 31, 2014	Jan. 31, 2015	Jun. 30, 2014
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	FALSE
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Trading Symbol	ONB
Entity Registrant Name	Old National Bancorp /IN/
Entity Central Index Key	707179
Current Fiscal Year End Date	-19
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		119,827,000
Entity Public Float			$1,470,138,456

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assets
Cash and due from banks	$207,871	$190,606
Money market and other interest-earning investments	32,092	16,117
Total cash and cash equivalents	239,963	206,723
Trading securities - at fair value	3,881	3,566
Securities - available-for-sale, at fair value	2,657,672	2,372,201
Securities - held-to-maturity, at amortized cost (fair value $903,935 and $780,758, respectively)	844,054	762,734
Federal Home Loan Bank stock, at cost	41,334	40,584
Loans held for sale, at fair value	213,490	7,705
Loans, net of unearned income	6,170,493	4,865,132
Covered loans, net of discount	147,708	217,832
Total loans	6,318,201	5,082,964
Allowance for loan losses	-44,297	-41,741
Allowance for loan losses - covered loans	-3,552	-5,404
Net loans	6,270,352	5,035,819
FDIC indemnification asset	20,603	88,513
Premises and equipment, net	135,892	108,306
Accrued interest receivable	60,966	50,205
Goodwill	530,845	352,729
Other intangible assets	38,694	25,957
Company-owned life insurance	325,617	275,121
Assets held for sale	9,127	9,056
Other real estate owned and repossessed personal property	7,241	7,562
Other real estate owned - covered	9,121	13,670
Other assets	238,699	221,293
Total assets	11,647,551	9,581,744
Deposits:
Noninterest-bearing demand	2,427,748	2,026,490
Interest-bearing:
NOW	2,176,879	1,775,938
Savings	2,222,557	1,941,652
Money market	574,462	448,848
Time	1,089,018	1,017,975
Total deposits	8,490,664	7,210,903
Short-term borrowings	551,309	462,332
Other borrowings	920,102	556,388
Accrued expenses and other liabilities	219,712	189,481
Total liabilities	10,181,787	8,419,104
Commitments and contingencies (Note 21)
Shareholders' Equity
Preferred stock, series A, 2,000 shares authorized, no shares issued or outstanding
Common stock, $1.00 per share stated value, 150,000 shares authorized, 116,847 and 99,859 shares issued and outstanding, respectively	116,847	99,859
Capital surplus	1,118,292	900,254
Retained earnings	262,180	206,993
Accumulated other comprehensive income (loss), net of tax	-31,555	-44,466
Total shareholders' equity	1,465,764	1,162,640
Total liabilities and shareholders' equity	$11,647,551	$9,581,744

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Securities - held-to-maturity, at fair value	$903,935	$780,758
Common stock, stated value	$1	$1
Authorized and unissued common shares reserved for issuance	150,000,000	150,000,000
Common stock, shares issued	116,847,000	99,859,000
Common stock, shares outstanding	116,847,000	99,859,000
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_Inc

Consolidated Statements of Income (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Loans including fees:
Taxable	$296,141	$252,499	$257,176
Nontaxable	10,207	9,411	8,858
Investment securities:
Taxable	60,903	60,371	62,889
Nontaxable	22,436	19,491	15,722
Money market and other interest-earning investments	42	38	54
Total interest income	389,729	341,810	344,699
Interest Expense
Deposits	13,326	18,124	27,042
Short-term borrowings	310	641	539
Other borrowings	9,723	5,621	8,361
Total interest expense	23,359	24,386	35,942
Net interest income	366,370	317,424	308,757
Provision for loan losses	3,097	-2,319	5,030
Net interest income after provision for loan losses	363,273	319,743	303,727
Noninterest Income
Wealth management fees	28,737	23,493	21,549
Service charges on deposit accounts	47,433	49,562	51,483
Debit card and ATM fees	25,835	25,019	24,006
Mortgage banking revenue	6,017	4,420	3,742
Insurance premiums and commissions	41,466	38,483	37,103
Investment product fees	17,136	16,018	12,714
Company-owned life insurance	6,924	7,454	6,452
Net securities gains	9,830	4,341	15,052
Total other-than-temporary impairment losses	-100	-1,000	-1,414
Loss recognized in other comprehensive income	0	0	0
Impairment losses recognized in earnings	-100	-1,000	-1,414
Gain on derivatives	363	176	820
Recognition of deferred gain on sale leaseback transactions	6,094	6,476	6,423
Gain on branch divestitures - deposit premium		2,894
Change in FDIC indemnification asset	-43,162	-9,288	-3,375
Other income	18,556	16,710	15,261
Total noninterest income	165,129	184,758	189,816
Noninterest Expense
Salaries and employee benefits	219,301	202,435	193,874
Occupancy	49,099	48,360	50,929
Equipment	12,453	11,879	11,744
Marketing	9,591	7,212	7,451
Data processing	25,382	21,608	22,014
Communication	10,476	10,521	10,939
Professional fees	16,390	11,948	12,030
Loan expense	6,107	6,972	7,037
Supplies	2,958	2,361	2,719
FDIC assessment	6,261	5,097	5,991
Other real estate owned expense	3,101	4,129	17,136
Amortization of intangibles	9,120	8,162	7,941
Other expense	16,199	21,300	15,953
Total noninterest expense	386,438	361,984	365,758
Income before income taxes	141,964	142,517	127,785
Income tax expense	38,297	41,597	36,110
Net income	$103,667	$100,920	$91,675
Net income per common share:
Basic earnings per share	$0.96	$1	$0.95
Diluted earnings per share	$0.95	$1	$0.95
Weighted average number of common shares outstanding:
Basic	107,818	100,712	96,440
Diluted	108,365	101,198	96,833
Dividends per common share	$0.44	$0.40	$0.36

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net income	$103,667	$100,920	$91,675
Change in securities available-for-sale:
Unrealized holding gains (losses) for the period	42,515	-125,761	37,178
Reclassification for securities transferred to held-to-maturity		31,005
Reclassification adjustment for securities gains realized in income	-9,830	-4,341	-15,052
Other-than-temporary-impairment on available-for-sale debt securities associated with credit loss realized in income	100	1,000	1,414
Income tax effect	-12,425	37,935	-9,098
Unrealized gains (losses) on available-for-sale securities	20,360	-60,162	14,442
Change in securities held-to-maturity:
Adjustment for securities transferred to available-for-sale			-1,588
Adjustment for securities transferred from available-for-sale		-31,005
Amortization of fair value for securities held-to-maturity previously recognized into accumulated other comprehensive income	1,437	225	-870
Income tax effect	-446	10,744	982
Changes from securities held-to-maturity	991	-20,036	-1,476
Cash flow hedges:
Net unrealized derivative gains (losses) on cash flow hedges	-9,514	-306
Reclassification adjustment for (gains) losses realized in net income	248		-240
Income tax effect	3,521	116	95
Changes from cash flow hedges	-5,745	-190	-145
Defined benefit pension plans:
Net actuarial (gain) loss recognized in income	-6,266	6,901	-1,903
Amortization of net (gain) loss and settlement cost recognized in income	1,933	3,436	5,197
Income tax effect	1,638	-4,216	-1,318
Changes from defined benefit pension plans	-2,695	6,121	1,976
Other comprehensive income (loss), net of tax	12,911	-74,267	14,797
Comprehensive income	$116,578	$26,653	$106,472

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Shareholders' Equity (USD $)	Total	Common Stock [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Indiana Community Bancorp [Member]	Indiana Community Bancorp [Member]	Indiana Community Bancorp [Member]	Tower Financial Corporation [Member]	Tower Financial Corporation [Member]	Tower Financial Corporation [Member]	United Bancorp, Inc. [Member]	United Bancorp, Inc. [Member]	United Bancorp, Inc. [Member]	LSB Financial Corp. [Member]	LSB Financial Corp. [Member]	LSB Financial Corp. [Member]
In Thousands	Total	Common Stock [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Indiana Community Bancorp [Member]	Common Stock [Member]	Capital Surplus [Member]	Tower Financial Corporation [Member]	Common Stock [Member]	Capital Surplus [Member]	United Bancorp, Inc. [Member]	Common Stock [Member]	Capital Surplus [Member]	LSB Financial Corp. [Member]	Common Stock [Member]	Capital Surplus [Member]
Balance at Dec. 31, 2011	$1,033,556	$94,654	$834,033	$89,865	$15,004
Net income	91,675			91,675
Other comprehensive income (loss)	14,797				14,797
Acquisition						88,497	6,626	81,871
Dividends - common stock	-34,657			-34,657
Common stock issued	254	21	233
Common stock repurchased	-3,990	-326	-3,664
Stock based compensation expense	3,317		3,317
Stock activity under incentive comp plans	1,116	204	1,128	-216
Balance at Dec. 31, 2012	1,194,565	101,179	916,918	146,667	29,801
Net income	100,920			100,920
Other comprehensive income (loss)	-74,267				-74,267
Dividends - common stock	-40,278			-40,278
Common stock issued	290	22	268
Common stock repurchased	-24,292	-1,728	-22,564
Stock based compensation expense	3,958		3,958
Stock activity under incentive comp plans	1,744	386	1,674	-316
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	5,626	73,101	123,806	9,117	114,689	51,758	3,557	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 comp plans	1,778	550	1,527	-299
Balance at Dec. 31, 2014	$1,465,764	$116,847	$1,118,292	$262,180	($31,555)

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash Flows From Operating Activities
Net income	$103,667	$100,920	$91,675
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation	12,366	11,227	11,306
Amortization and impairment of other intangible assets	9,120	8,162	7,941
Net premium amortization on investment securities	15,430	16,573	13,816
Decrease in FDIC indemnification asset	43,162	9,288	3,375
Stock compensation expense	4,162	3,958	3,317
Provision for loan losses	3,097	-2,319	5,030
Net securities gains	-9,830	-4,341	-15,052
Impairment on available-for-sale securities	100	1,000	1,414
Recognition of deferred gain on sale leaseback transactions	-6,094	-6,476	-6,423
Gain on derivatives	-363	-176	-820
Gain on branch divestitures		-2,894
Net gains on sales and write-downs of loans and other assets	-3,546	-3,331	-1,547
Loss on retirement of debt		993	1,949
Increase in cash surrender value of company-owned life insurance	-6,920	-4,492	-6,103
Residential real estate loans originated for sale	-148,946	-143,387	-86,665
Proceeds from sale of residential real estate loans	147,566	152,225	83,912
Increase in interest receivable	-4,731	-3,222	-13
Decrease in other real estate owned	7,049	16,084	6,356
Decrease in other assets	20,039	3,896	15,452
Increase (decrease) in accrued expenses and other liabilities	14,392	11,723	-14,630
Total adjustments	96,053	64,491	22,615
Net cash flows provided by operating activities	199,720	165,411	114,290
Cash Flows From Investing Activities
Net cash and cash equivalents of acquired banks and branches	-3,050	530,000	78,540
Payments related to branch divestitures		-168,268
Purchases of investment securities available-for-sale	-575,894	-1,231,117	-1,031,124
Purchases of investment securities held-to-maturity	-103,299	-31,841
Proceeds from maturities, prepayments and calls of investment securities available-for-sale	468,764	632,614	591,735
Proceeds from sales of investment securities available-for-sale	214,912	231,806	227,566
Proceeds from maturities, prepayments and calls of investment securities held-to-maturity	16,189	25,208	31,507
Purchase of Federal Home Loan Bank stock		-2,657
Proceeds from sale of Federal Home Loan Bank stock	7,507
Proceeds from sale of loans and leases		114,527	2,355
Reimbursement under FDIC loss share agreements	26,342	19,527	48,223
Net principal collected from (loans made to) loan customers	-196,287	-3,622	54,720
Proceeds from sale of premises and equipment and other assets	2,755	3,394	3,498
Purchases of premises and equipment and other assets	-20,473	-18,617	-18,712
Net cash flows provided by (used in) investing activities	-162,534	100,954	-11,692
Cash Flows From Financing Activities
Deposits	-304,510	-454,837	-117,663
Short-term borrowings	59,659	-127,483	164,965
Payments for maturities on other borrowings	-211,159	-2,521	-3,087
Payments related to retirement of debt		-50,993	-67,949
Proceeds from issuance of other borrowings	525,000	375,000
Cash dividends paid on common stock	-48,181	-40,278	-34,657
Common stock repurchased	-25,830	-24,292	-3,990
Proceeds from exercise of stock options, including tax benefit	749	1,412	717
Common stock issued	326	290	254
Net cash flows provided by (used in) financing activities	-3,946	-323,702	-61,410
Net increase (decrease) in cash and cash equivalents	33,240	-57,337	41,188
Cash and cash equivalents at beginning of period	206,723	264,060	222,872
Cash and cash equivalents at end of period	$239,963	$206,723	$264,060

Nature_of_Operations

Nature of Operations	12 Months Ended
Nature of Operations	Dec. 31, 2014
Accounting Policies [Abstract]
Nature of Operations	NATURE OF OPERATIONS
Nature of Operations	Old National Bancorp, a financial holding company headquartered in Evansville, Indiana, operates primarily in Indiana, southeastern Illinois, western Kentucky, and southwestern Michigan. Its principal subsidiaries include Old National Bank and ONB Insurance Group, Inc. 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, investment and insurance products.

Basis_of_Presentation_and_Sign

Basis of Presentation and Significant Accounting Policies

12 Months Ended

Dec. 31, 2014

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. The allowance for loan losses, valuation of purchased loans, FDIC indemnification asset, valuation and impairment of securities, goodwill and intangibles, derivative financial instruments, and income taxes are particularly subject to change.

All significant intercompany transactions and balances have been eliminated.

TRADING SECURITIES

Trading securities consist of investments in various mutual funds held in grantor trusts formed by Monroe Bancorp in connection with a deferred compensation plan. 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 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 – Management evaluates securities for other-than-temporary-impairment at least on a quarterly basis, and more frequently when economic or market conditions warrant such evaluation. Consideration is given to (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 including an evaluation of credit ratings, (3) whether the market decline was affected by macroeconomic conditions, (4) the intent of Old National to sell a security, and (5) whether it is more likely than not Old National will have to sell the security before recovery of its cost basis. If Old National intends to sell an impaired security, Old National records an other-than-temporary loss in an amount equal to the entire difference between fair value and amortized cost. If a security is determined to be other-than-temporarily-impaired, but Old National does not intend to sell the security and it is not more likely than not that it will be required to sell the security, only the credit portion of the estimated loss is recognized in earnings, with the other portion of the loss recognized in other comprehensive income. See Note 4 to the consolidated financial statements for a detailed description of the quarterly evaluation process.

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 (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 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 are returned to accrual status when all the principal and interest amounts contractually due are brought current, remain current for six months 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 the remaining life of the acquired loans, estimated prepayments, estimated loss ratios, estimated value of the underlying collateral, net present value of cash flows expected to be received, among others. Purchased loans are accounted for in accordance with guidance for certain loans acquired in a transfer, 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 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

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 recognizing income on impaired loans is to accrue interest unless a 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 covered loan loss provision or prospective yield adjustments.

It is Old National’s policy to charge 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. The historical loss experience is determined by portfolio segment and is based on the actual loss history experienced by Old National over the most relevant three years. 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 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), amortization of goodwill and indefinite-lived assets is not recorded. However, the recoverability of goodwill and other intangible assets are annually tested for impairment. Other intangible assets, including core deposits and customer business relationships, are amortized primarily on an accelerated cash flow basis over their estimated useful lives, generally over a period of 7 to 25 years.

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. The amount of company-owned life insurance at December 31, 2014 and 2013 was $325.6 million and $275.1 million, respectively.

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 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 as a hedge because the forecasted transaction is no longer probable of occurring; (4) a hedged firm commitment no longer meets the definition of a firm commitment; (5) or management otherwise determines that designation of the derivative as a hedging instrument is no longer appropriate.

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. The amount of foreclosed assets at December 31, 2014 and 2013 was $16.4 million and $21.2 million, respectively. Included in foreclosed assets at December 31, 2014 and 2013 is approximately $9.1 million and $13.7 million, respectively, of covered other real estate owned from the Integra acquisition (see discussion below regarding covered assets).

SECURITIES PURCHASED UNDER AGREEMENTS TO RESELL AND SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE

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 will 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.” Under the terms of the loss sharing agreements, the FDIC will reimburse Old National for 80% of losses up to $275.0 million, losses in excess of $275.0 million up to $467.2 million at 0% reimbursement, and 80% of losses in excess of $467.2 million. As of December 31, 2014, we do not expect losses to exceed $275.0 million. Old National will reimburse the FDIC for its share of recoveries with respect to losses for which the FDIC has previously reimbursed Old National under the loss sharing agreements. The loss sharing

provisions of the agreements for commercial and single family residential mortgage loans are in effect for five and ten years, respectively, from the July 29, 2011 acquisition date and the loss recovery provisions for such loans are in effect for eight years and ten years, respectively, from the acquisition date.

Loans were recorded at fair value in accordance with ASC Topic 805, Business Combinations. No allowance for loan losses related to the acquired loans is recorded on the acquisition date as the fair value of the loans acquired incorporates 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 include estimates related to expected prepayments and the amount and timing of undiscounted expected principal, interest and other cash flows.

Because the FDIC will reimburse 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 is 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 reflect the reimbursements expected to be received from the FDIC, using an appropriate discount rate, which reflects counterparty credit risk and other uncertainties. The carrying value of the indemnification asset at December 31, 2014 and 2013 was $20.6 million and $88.5 million, respectively.

The loss share agreements continue to be measured on the same basis as the related indemnified loans. Because the acquired loans are subject to the accounting prescribed by ASC Topic 310, subsequent changes to the basis of the loss share agreements also follow that model. Deterioration in our expectation of credit quality of the loans or OREO would immediately increase the basis of the loss share agreements, with the offset recorded through the consolidated statement of income. Increases in the credit quality or cash flows of loans (reflected as an adjustment to yield and accreted into income over the remaining life of the loans) decrease the basis of the loss share agreements, with the decrease being amortized into income over the same period or the life of the loss share agreements, whichever is shorter. Loss assumptions used in the basis of the indemnified loans are consistent with the loss assumptions used to measure the indemnification asset. Initial fair value accounting incorporates into the fair value of the indemnification asset an element of the time value of money, which is accreted back into income over the life of the loss share agreements.

NET INCOME PER SHARE

Basic net income per share is computed by dividing net income available to common shareholders 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.

EARNINGS PER SHARE RECONCILIATION

(dollars and shares in thousands, except per share data)

2014

2013

2012

Basic Earnings Per Share

Net income

103,667

100,920

91,675

Weighted average common shares outstanding

107,818

100,712

96,440

Basic Earnings Per Share

0.96

0.95

Diluted Earnings Per Share

Net income

103,667

100,920

91,675

Weighted average common shares outstanding

107,818

100,712

96,440

Effect of dilutive securities:

Restricted stock (1)

488

455

379

Stock options (2)

Weighted average shares outstanding

108,365

101,198

96,833

Diluted Earnings Per Share

0.95

-1

0, 0 and 6 shares of restricted stock and restricted stock units were not included in the computation of net income per diluted share at December 31, 2014, 2013 and 2012 respectively, because the effect would be antidilutive.

-2

Options to purchase 976 shares, 1,007 shares and 3,284 shares outstanding at December 31, 2014, 2013, and 2012, 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 21 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. Cash paid for interest was $21.0 million during 2014, $25.8 million during 2013 and $38.4 million during 2012. Cash paid for income tax, net of refunds, was a payment of $18.8 million during 2014, a payment of $11.8 million during 2013 and a payment of $24.2 million during 2012, respectively. Other noncash transactions include loans transferred to loans held for sale of $197.9 million in 2014, $102.8 million in 2013 and $1.7 million in 2012; premises and equipment of $3.0 million transferred to assets held for sale in 2014; leases transferred to held for sale of $11.6 million in 2013; transfers of securities from the available-for-sale portfolio to the held-to-maturity portfolio of $357.8 million in 2013; and transfers of securities from the held-to-maturity portfolio to the available-for-sale portfolio of $46.1 million in 2012. Approximately 5.6 million shares of common stock, valued at approximately $78.7 million, were issued in the acquisition of Tower Financial Corporation on April 25, 2014. Approximately 9.1 million shares of common stock, valued at approximately $123.8 million, were issued in the acquisition of United Bancorp on July 31, 2014. Approximately 3.6 million shares of common stock, valued at approximately $51.8 million, were issued in the acquisition of LSB Financial Corp. on November 1, 2014. Approximately 6.6 million shares of common stock, valued at approximately $88.5 million, were issued in the acquisition of Indiana Community Bancorp on September 15, 2012.

IMPACT OF ACCOUNTING CHANGES

FASB ASC 405 – In February 2013, the FASB issued an update (ASU No. 2013-04, Obligations Resulting from Joint and Several Liability Arrangements for Which the Total Amount of the Obligation is Fixed at the Reporting Date) impacting FASB ASC 405, Liabilities. This update requires an entity to measure obligations resulting from joint and several liability arrangements for which the total amount of the obligation within the scope of the guidance is fixed at the reporting date as the sum of (1) the amount the reporting entity agreed to pay on the basis of its arrangement among its co-obligors and (2) any additional amount the reporting entity expects to pay on behalf of its co-obligors. This update also requires an entity to disclose the nature and amount of the obligation as well as other information about those obligations. This update became effective for interim and annual periods beginning after December 15, 2013 and did not have a material impact on the consolidated financial statements.

FASB ASC 323 – In January 2014, the FASB issued an update (ASU No. 2014-01, Accounting for Investments in Qualified Affordable Housing Projects) impacting FASB ASC 323, Investments – Equity Method and Joint Ventures. This update permits reporting entities to make an accounting policy election to account for their investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met. Under the proportional amortization method, an entity amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received and recognizes the net investment performance in the income statement as a component of income tax expense (benefit). The amendments in this update became effective for interim and annual periods beginning after December 15, 2014 and did not have a material impact on the consolidated financial statements.

FASB ASC 310 – In January 2014, the FASB issued an update (ASU No. 2014-04, Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure) impacting FASB ASC 310-40. The amendments in this update clarify that an in substance repossession or foreclosure occurs, and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either (1) the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure or (2) the borrower conveying all interest in the property in the residential real estate property to the creditor to satisfy that loan through completion of a deed in lieu of foreclosure or through a similar legal agreement. The amendments also require disclosure of (1) the amount of foreclosed residential real estate property held by the creditor and (2) the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure. The amendments in this update became effective for interim and annual periods beginning after December 15, 2014 and did not have a material impact on the consolidated financial statements.

FASB ASC 205 and 360 – In April 2014, the FASB issued an update (ASU No. 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity) impacting FASB ASC 205, Presentation of Financial Statements, and FASB ASC 360, Property, Plant, and Equipment. The amendments in this update change the requirements for reporting discontinued operations. A discontinued operation may include a component of an entity or a group of components of an entity, or a business or nonprofit activity. A disposal of a component of an entity or a group of components of an entity is required to be reported in discontinued operations if the disposal represents a strategic shift that has, or will have, a major effect on an entity’s operations and financial results. An entity will have to present, for each comparative period, the assets and liabilities of a disposal group that includes discontinued operations separately in the asset and liability sections of the statement of financial position. The amendments in this update became effective for interim and annual periods beginning after December 15, 2014 and did not have a material impact on the consolidated financial statements.

FASB ASC 606 – In May 2014, the FASB issued an update (ASU No. 2014-09, Revenue from Contracts with Customers) creating FASB Topic 606, Revenue from Contracts with Customers. The guidance in this update affects any entity that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of nonfinancial assets unless those contracts are within the scope of other standards (for example, insurance contracts or lease contracts). The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance provides steps to follow to achieve the core principle. An entity should disclose sufficient information to enable users of financial statements to understand the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. The amendments in this update become effective for annual periods and interim periods within those annual periods beginning after December 15, 2016. We are currently evaluating the impact of adopting the new guidance on the consolidated financial statements, but it is not expected to have a material impact.

FASB ASC 860 – In June 2014, the FASB issued an update (ASU No. 2014-11, Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures) impacting FASB ASC 860, Transfers and Servicing. The amendments in this update change the accounting for repurchase-to-maturity transactions and linked repurchase financings to secured borrowing accounting, which is consistent with the accounting for other repurchase agreements. The amendments also require new disclosures. An entity is required to disclose information on transfers accounted for as sales in transactions that are economically similar to repurchase agreements. An entity must also provide additional information about the types of collateral pledged in repurchase agreements and similar transactions accounted for as secured borrowings. An entity is required to present changes in accounting for transactions outstanding on the effective date as a cumulative-effect adjustment to retained earnings as of the beginning of the period of adoption. The amendments in this update become effective for the first interim or annual period beginning after December 15, 2014. We are currently evaluating the impact of adopting the new guidance on the consolidated financial statements, but it is not expected to have a material impact.

FASB ASC 718 – In June 2014, the FASB issued an update (ASU No. 2014-12, Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period) impacting FASB ASC 860, Transfers and Servicing. Generally, an award with a performance target also requires an employee to render service until the performance target is achieved. In some cases, however, the terms of an award may provide that the performance target could be achieved after an employee completes the requisite service period. The amendments in this update require that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. An entity should apply guidance in Topic 718 as it relates to awards with performance conditions that affect vesting to account for such awards. As such, the performance target should not be reflected in estimating the grant-date fair value of the award. Compensation cost should be recognized in the period in which it becomes probable that the performance target will be achieved and should represent the compensation cost attributable to the period for which the service has already been rendered. The amendments in this update become effective for annual periods and interim periods within those annual periods beginning after December 15, 2015. We are currently evaluating the impact of adopting the new guidance on the consolidated financial statements, but it is not expected to have a material impact.

FASB ASC 310 – In August 2014, the FASB issued an update (ASU No. 2014-14, Classification of Certain Government-Guaranteed Mortgage Loans upon Foreclosure) impacting FASB ASC 310-40, Receivables – Troubled Debt Restructuring by Creditors. This update affects creditors that hold government-guaranteed mortgage loans. The amendments in this update require that a mortgage loan be derecognized and that a separate other receivable be recognized if the following conditions are met: (1) The loan has a government guarantee that is not separable from the loan before foreclosure. (2) At the time of foreclosure, the creditor has the intent to convey the real estate property to the guarantor and make a claim on the guarantee, and the creditor has the ability to recover under the claim. (3) At the time of foreclosure, the claim that is determined on the basis of the fair value of the real estate is fixed. Upon foreclosure, the separate other receivable should be measured based on the amount of the loan balance (principal and interest) expected to be recovered from the guarantor. The amendments in this update become effective for annual periods and interim periods within those annual periods beginning after December 15, 2014. We are currently evaluating the impact of adopting the new guidance on the consolidated financial statements, but it is not expected to have a material impact.

RECLASSIFICATIONS

Certain prior year amounts have been reclassified to conform to the 2014 presentation. Such reclassifications had no effect on net income or shareholders’ equity and were insignificant amounts.

Acquisition_and_Divestiture_Ac

Acquisition and Divestiture Activity	12 Months Ended
Acquisition and Divestiture Activity	Dec. 31, 2014
Business Combinations [Abstract]
Acquisition and Divestiture Activity	NOTE 2 – ACQUISITION AND DIVESTITURE ACTIVITY

	Acquisitions

	Bank of America

	On January 9, 2013, Old National announced that it had entered into a purchase and assumption agreement to acquire 24 bank branches of Bank of America. Four of the branches are located in northern Indiana and 20 branches are located in southwest Michigan. The Company paid a deposit premium of 2.94%. The acquisition doubled Old National’s presence in the South Bend/Elkhart, Indiana area and provided a logical market extension into southwest Michigan. The premium paid for our entrance into a new market drove the goodwill recorded in this transaction. The transaction closed on July 12, 2013.

	During the three months ended June 30, 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		$	562,906
	Loans			5,638
	Premises and equipment			12,559
	Accrued interest receivable			15
	Other assets			331
	Deposits			(565,106	)
	Accrued expenses and other liabilities			(246	)

	Net tangible assets acquired			16,097
	Definite-lived intangible assets acquired			3,462
	Goodwill			13,347

	Purchase price		$	32,906


	The acquired identifiable intangible asset is core deposit intangible and the estimated fair value is approximately $3.5 million. The core deposit intangible asset will be amortized over an estimated useful life of 7 years and is included in the “Banking” segment, as described in Note 25 of these consolidated financial statement footnotes. The goodwill recorded in the transaction will be deductible for tax purposes and is included in the “Banking” segment.



	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 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.

	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	)
	Short-term borrowings			(18,898	)
	Other borrowings			(21,113	)
	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


	Of the total purchase price, $45.8 million has been allocated to net tangible assets acquired and $8.4 million has been allocated to definite-lived intangible assets acquired. The remaining purchase price has been allocated to goodwill. The goodwill will not be deductible for tax purposes and is included in the “Banking” segment, as described in Note 25 of these consolidated financial statement footnotes.



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 and are included in the “Banking” segment, as described in Note 25 of these consolidated financial statement footnotes.



		Estimated				Estimated
		Fair Value				Useful
		(in millions)				Lives
						(Years)
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 Acquisition
		of Acquired Loans				Amounts Receivable		Date of Contractual Cash Flows
		at Acquisition Date				at Acquisition Date		Not Expected to be Collected
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 doubles Old National’s presence in Michigan to 36 total branches and 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.

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. To date, transaction and integration costs of $7.5 million associated with the acquisition have been expensed and remaining integration costs will be expensed in future quarters as incurred.



Under the acquisition method of accounting, the total estimated purchase price is allocated to United’s 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 United acquisition is allocated 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	)
Short-term borrowings			(10,420	)
Other borrowings			(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


During the fourth quarter of 2014, adjustments were made to the purchase price allocations that affected the amounts allocated to goodwill and other assets. 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 retrospectively.

Of the total purchase price, $56.1 million has been allocated to net tangible assets acquired, $9.0 million has been allocated to loan servicing rights and $10.8 million has been allocated to definite-lived intangible assets acquired. The remaining purchase price has been allocated to goodwill. The goodwill will not be deductible for tax purposes and is included in the “Banking” segment, as described in Note 25 of these consolidated financial statement footnotes.

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 and are included in the “Banking” segment, as described in Note 25 of these consolidated financial statement footnotes.



		Estimated				Estimated
		Fair Value				Useful Lives (Years)
		(in millions)
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 Acquisition
		of Acquired Loans				Amounts Receivable		Date of Contractual Cash Flows
		at Acquisition Date				at Acquisition Date		Not Expected to be Collected
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 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.

The total purchase price for LSB was $69.6 million, consisting of $17.8 million of cash, 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. To date, transaction and integration costs of $1.8 million associated with the acquisition have been expensed and remaining integration costs will be expensed in future quarters as incurred.

Under the acquisition method of accounting, the total estimated purchase price is allocated to LSB’s 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 LSB acquisition is allocated 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			236,201
Premises and equipment			6,492
Accrued interest receivable			1,044
Other real estate owned			30
Company-owned life insurance			7,438
Other assets			11,182
Deposits			(292,068	)
Other borrowings			(15,203	)
Accrued expenses and other liabilities			(4,582	)

Net tangible assets acquired			26,027
Definite-lived intangible assets acquired			2,618
Loan servicing rights			990
Goodwill			39,960

Purchase price		$	69,595




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 retrospectively.

Of the total purchase price, $26.0 million has been allocated to net tangible assets acquired, $1.0 million has been allocated to loan servicing rights and $2.6 million has been allocated to definite-lived intangible assets acquired. The remaining purchase price has been allocated to goodwill. The goodwill will not be deductible for tax purposes and is included in the “Banking” segment, as described in Note 25 of these consolidated financial statement footnotes.

The acquired identifiable intangible asset is core deposit intangible and the estimated fair value is $2.6 million. The core deposit intangible asset will be amortized over an estimated useful life of 7 years and is included in the “Banking” segment, as described in Note 25 of these consolidated financial statement footnotes.

Acquired loan data for LSB can be found in the table below:



(in thousands)		Fair Value				Gross Contractual		Best Estimate at Acquisition
		of Acquired Loans				Amounts Receivable		Date of Contractual Cash Flows
		at Acquisition Date				at Acquisition Date		Not Expected to be Collected
Acquired receivables subject to ASC 310-30		$	11,986			$	24,493	$	9,903
Acquired receivables not subject to ASC 310-30		$	224,215			$	340,832	$	57,884

Summary of Unaudited Pro-forma Information

The unaudited pro-forma information below for the periods ended December 31, 2014 and 2013 gives effect to the Tower, United and LSB acquisitions as if the acquisitions had occurred on January 1, 2013. Supplemental pro-forma earnings for 2014 were adjusted to exclude $14.9 million of acquisition-related costs incurred during 2014. Supplemental pro-forma earnings for 2013 were adjusted to include these charges. The pro-forma financial information is not necessarily indicative of the results of operations if the acquisitions had been effective as of this date.



(dollars in thousands)		2014				2013
Revenue (1)		$	590,492			$	609,261
Net income		$	138,056			$	145,635


-1	Net interest income plus noninterest income.

Consolidated 2014 results included approximately $48.1 million of revenue and $10.4 million of net income attributable to the Tower, United, and LSB acquisitions.

Pending Acquisitions at December 31, 2014

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. Founders is a bank holding company with Founders Bank & Trust as its wholly-owned subsidiary. Founders Bank & Trust operates four full-service banking centers in Kent County. At December 31, 2014, Founders had total assets of approximately $459.9 million and $376.1 million of deposit liabilities. Pursuant to the merger agreement, shareholders of Founders received 3.25 shares of Old National common stock and $38.00 in cash for each share of Founders common stock. Based upon the December 31, 2014, closing price of $14.88 per share of Old National common stock, the transaction was valued at approximately $91.7 million. The transaction closed on January 1, 2015 and management is still in the process of making fair value determinations.



Divestitures

During 2013, Old National sold 12 branches. Deposits at the time of the sales were approximately $178.2 million and the Company received deposit premiums of $2.9 million. Also in 2013, in an effort to provide an efficient and effective branch banking network, Old National consolidated 23 additional banking centers into existing branch locations.

Subsequent to December 31, 2014, Old National announced plans to sell its southern Illinois franchise (twelve branches), four branches in eastern Indiana and one in Ohio as part of its ongoing efficiency improvements. At December 31, 2014, $197.9 million of loans associated with these transactions were classified as held for sale. Deposits of approximately $620.0 million will also be included in the sales. In addition, the Company announced plans to consolidate or close 19 branches throughout the Old National franchise 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. It is currently expected that these transactions will be completed prior to September 30, 2015.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Income (Loss)	12 Months Ended
Accumulated Other Comprehensive Income (Loss)	Dec. 31, 2014
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, 2014, 2013 and 2012:



			Changes in AOCI by Component (a)
	(dollars in thousands)		Unrealized Gains				Unrealized Gains			Gains and			Defined			Total
			and Losses on				and Losses on			Losses on			Benefit
			Available-for-Sale				Held-to-Maturity			Cash Flow			Pension
			Securities				Securities			Hedges			Plans
	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) (b)			(6,031	)			991			154			(2,695	)		(7,581	)

	Net current-period 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	)

	2013
	Balance at January 1, 2013		$	39,054			$	3,269		$	—		$	(12,522	)	$	29,801
	Other comprehensive income (loss) before reclassifications			(57,958	)			(20,224	)		(190	)		—			(78,372	)
	Amounts reclassified from accumulated other comprehensive income (loss) (b)			(2,204	)			188			—			6,121			4,105

	Net current-period other comprehensive income (loss)			(60,162	)			(20,036	)		(190	)		6,121			(74,267	)

	Balance at December 31, 2013		$	(21,108	)		$	(16,767	)	$	(190	)	$	(6,401	)	$	(44,466	)

	2012
	Balance at January 1, 2012		$	24,612			$	4,745		$	145		$	(14,498	)	$	15,004
	Other comprehensive income (loss) before reclassifications			22,808				(954	)		—			—			21,854
	Amounts reclassified from accumulated other comprehensive income (loss) (b)			(8,366	)			(522	)		(145	)		1,976			(7,057	)

	Net current-period other comprehensive income (loss)			14,442				(1,476	)		(145	)		1,976			14,797

	Balance at December 31, 2012		$	39,054			$	3,269		$	—		$	(12,522	)	$	29,801



	(a)	All amounts are net of tax. Amounts in parentheses indicate debits.
	(b)	See tables 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, 2014, 2013 and 2012:



	Reclassifications out of Accumulated Other Comprehensive Income (Loss)

	Year Ended December 31, 2014 (a)
	Details about Accumulated		Amount Reclassified from				Affected Line Item in the Statement
			Accumulated Other
	Other Comprehensive Income		Comprehensive Income (Loss)				Where Net Income is Presented

	(Loss) Components
	Unrealized gains and losses on available-for-sale securities
			$	9,830			Net securities gains
				(100	)		Impairment losses

				9,730			Total before tax
				(3,699	)		Tax (expense) or benefit

		$	6,031			Net of tax

Unrealized gains and losses on held-to-maturity securities
		$	(1,437	)		Interest income/(expense)
			446			Tax (expense) or benefit

		$	(991	)		Net of tax

Gains and losses on cash flow hedges
Interest rate contracts		$	(248	)		Interest income/(expense)
			94			Tax (expense) or benefit

		$	(154	)		Net of tax

Amortization of defined benefit pension items
Actuarial gains/(losses)		$	6,266			(b)
Amortization of net actuarial losses			(1,933	)		(b)
			(1,638	)		Tax (expense) or benefit

		$	2,695			Net of tax

Total reclassifications for the period		$	7,581			Net of tax



(a)	Amounts in parentheses indicate debits to profit/loss.
(b)	This accumulated other comprehensive income (loss) component is included in the computation of net periodic pension cost. See Note 15 for additional details on our pension plans.



Reclassifications out of Accumulated Other Comprehensive Income (Loss)

Year Ended December 31, 2013 (a)
Details about Accumulated		Amount Reclassified from				Affected Line Item in the Statement
		Accumulated Other
Other Comprehensive Income		Comprehensive Income (Loss)				Where Net Income is Presented

(Loss) Components
Unrealized gains and losses on available-for-sale securities
		$	4,341			Net securities gains
			(1,000	)		Impairment losses

			3,341			Total before tax
			(1,137	)		Tax (expense) or benefit

		$	2,204			Net of tax

Unrealized gains and losses on held-to-maturity securities
		$	(225	)		Interest income/(expense)
			37			Tax (expense) or benefit

		$	(188	)		Net of tax

Gains and losses on cash flow hedges
Interest rate contracts		$	—			Interest income/(expense)
			—			Tax (expense) or benefit

		$	—			Net of tax

Amortization of defined benefit pension items
Actuarial gains/(losses)		$	(6,901	)		(b)
Amortization of net actuarial losses			(3,436	)		(b)
			4,216			Tax (expense) or benefit

		$	(6,121	)		Net of tax

Total reclassifications for the period		$	(4,105	)		Net of tax



(a)	Amounts in parentheses indicate debits to profit/loss.
(b)	This accumulated other comprehensive income (loss) component is included in the computation of net periodic pension cost. See Note 15 for additional details on our pension plans.



Reclassifications out of Accumulated Other Comprehensive Income (Loss)

Year Ended December 31, 2012
Details about Accumulated		Amount Reclassified from				Affected Line Item in the Statement
		Accumulated Other
Other Comprehensive Income		Comprehensive Income (Loss)				Where Net Income is Presented

(Loss) Components
Unrealized gains and losses on available-for-sale securities
		$	15,052			Net securities gains
			(1,414	)		Impairment losses

			13,638			Total before tax
			(5,272	)		Tax (expense) or benefit

		$	8,366			Net of tax

Unrealized gains and losses on held-to-maturity securities
		$	870			Interest income/(expense)
			(348	)		Tax (expense) or benefit

		$	522			Net of tax

Gains and losses on cash flow hedges
Interest rate contracts		$	240			Interest income/(expense)
			(95	)		Tax (expense) or benefit

		$	145			Net of tax

Amortization of defined benefit pension items
Actuarial gains/(losses)		$	1,903			(b)
Amortization of net actuarial losses			(5,197	)		(b)
			1,318			Tax (expense) or benefit

		$	(1,976	)		Net of tax

Total reclassifications for the period		$	7,057			Net of tax



(a)	Amounts in parentheses indicate debits to profit/loss.
(b)	This accumulated other comprehensive income (loss) component is included in the computation of net periodic pension cost. See Note 15 for additional details on our pension plans.

Investment_Securities

Investment Securities	12 Months Ended
Investment Securities	Dec. 31, 2014
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 and held-to-maturity investment securities portfolio at December 31 and the corresponding amounts of unrealized gains and losses therein:



	(dollars in thousands)		Amortized				Unrealized				Unrealized				Fair
	(dollars in thousands)		Cost				Gains				Losses				Value
	2014
	Available-for-Sale
	U.S. Treasury		$	14,978			$	196			$	(8	)		$	15,166
	U.S. government-sponsored entities and agencies			692,704				1,533				(8,286	)			685,951
	Mortgage-backed securities – Agency			1,233,811				18,219				(10,368	)			1,241,662
	States and political subdivisions			304,435				11,023				(917	)			314,541
	Pooled trust preferred securities			17,965				—				(11,358	)			6,607
	Other securities			395,076				2,338				(3,669	)			393,745

	Total available-for-sale securities		$	2,658,969			$	33,309			$	(34,606	)		$	2,657,672

	Held-to-Maturity
	U.S. government-sponsored entities and agencies		$	167,207			$	6,279			$	—			$	173,486
	Mortgage-backed securities – Agency			23,648				926				—				24,574
	States and political subdivisions			653,199				52,753				(77	)			705,875

	Total held-to-maturity securities		$	844,054			$	59,958			$	(77	)		$	903,935

	2013
	Available-for-Sale
	U.S. Treasury		$	12,995			$	118			$	—			$	13,113
	U.S. government-sponsored entities and agencies			456,123				464				(20,999	)			435,588
	Mortgage-backed securities – Agency			1,300,135				15,690				(26,567	)			1,289,258
	Mortgage-backed securities – Non-agency			17,036				376				—				17,412
	States and political subdivisions			260,398				10,112				(1,715	)			268,795
	Pooled trust preferred securities			19,215				—				(11,178	)			8,037
	Other securities			340,381				5,140				(5,523	)			339,998

	Total available-for-sale securities		$	2,406,283			$	31,900			$	(65,982	)		$	2,372,201

	Held-to-Maturity
	U.S. government-sponsored entities and agencies		$	170,621			$	7,749			$	—			$	178,370
	Mortgage-backed securities – Agency			35,443				906				(1	)			36,348
	States and political subdivisions			556,670				10,949				(1,579	)			566,040

	Total held-to-maturity securities		$	762,734			$	19,604			$	(1,580	)		$	780,758




	Proceeds from sales or calls of available-for-sale investment securities, the resulting realized gains and realized losses, and other securities gains or losses were as follows for the years ended December 31:



	(dollars in thousands)		2014				2013				2012
	Proceeds from sales of available-for-sale securities		$	214,912			$	231,806			$	227,566
	Proceeds from calls of available-for-sale securities			123,141				172,465				149,409

	Total		$	338,053			$	404,271			$	376,975

	Realized gains on sales of available-for-sale securities		$	9,938			$	4,715			$	14,101
	Realized gains on calls of available-for-sale securities			154				50				802
	Realized losses on sales of available-for-sale securities			(128	)			(865	)			(9	)
	Realized losses on calls of available-for-sale securities			(471	)			(171	)			(7	)
	Other securities gains (1)			337				612				165

Net securities gains		$	9,830			$	4,341			$	15,052



-1	Other securities gains includes net realized gains or losses associated with trading securities and mutual funds.

Investment securities were pledged to secure public and other funds with a carrying value of $1.4 billion at December 31, 2014 and $1.1 billion at December 31, 2013.

Trading securities, which consist of mutual funds held in a trust associated with deferred compensation plans for former Monroe Bancorp directors and executives, are recorded at fair value and totaled $3.9 million at December 31, 2014 and $3.6 million at December 31, 2013.

At December 31, 2014, Old National had a concentration of investment securities issued by certain states and their political subdivisions with the following aggregate market values: $328.2 million by Indiana, which represented 22.4% of shareholders’ equity, and $194.0 million by Texas, which represented 13.2% of shareholders’ equity. Of the Indiana municipal bonds, 90% are rated “A” or better, and the remaining 10% generally represent non-rated local interest bonds where Old National has a market presence. All of the Texas municipal bonds are rated “AA” or better, and the majority of issues are backed by the “AAA” rated State of Texas Permanent School Fund Guarantee Program. At December 31, 2013, Old National had a concentration of investment securities issued by Indiana and its political subdivisions totaling $297.3 million, which represented 25.6% of shareholders’ equity, and $136.5 million by Texas, which represented 11.7% of shareholders’ equity.



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.



		2014								Weighted				2013						Weighted
		2014								Average				2013						Average
(dollars in thousands)		Amortized				Fair				Yield				Amortized			Fair			Yield
		Cost				Value								Cost			Value
Maturity
Available-for-Sale
Within one year		$	39,429			$	40,019				4.82	%		$	23,839		$	23,884			3.52	%
One to five years			435,460				437,972				1.88				216,236			222,293			2.79
Five to ten years			631,821				630,599				2.25				534,720			519,692			2.39
Beyond ten years			1,552,259				1,549,082				2.25				1,631,488			1,606,332			2.46

Total		$	2,658,969			$	2,657,672				2.23	%		$	2,406,283		$	2,372,201			2.48	%

Held-to-Maturity
Within one year		$	1,508			$	1,511				3.14	%		$	72		$	73			3.46	%
One to five years			25,417				26,579				3.9				15,035			15,757			4.02
Five to ten years			182,854				189,953				3.37				164,138			169,345			3.19
Beyond ten years			634,275				685,892				5.51				583,489			595,583			5.56

Total		$	844,054			$	903,935				4.99	%		$	762,734		$	780,758			5.02	%




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
(dollars in thousands)		Fair Value				Losses				Fair Value				Losses			Fair Value			Losses
2014
Available-for-Sale
U.S. Treasury		$	9,524			$	(8	)		$	—			$	—		$	9,524		$	(8	)
U.S. government-sponsored entities and agencies			180,488				(563	)			257,914				(7,723	)		438,402			(8,286	)
Mortgage-backed securities – Agency			31,304				(122	)			386,788				(10,246	)		418,092			(10,368	)
States and political subdivisions			41,481				(288	)			9,534				(629	)		51,015			(917	)
Pooled trust preferred securities			—				—				6,607				(11,358	)		6,607			(11,358	)
Other securities			115,973				(906	)			95,344				(2,763	)		211,317			(3,669	)

Total available-for-sale		$	378,770			$	(1,887	)		$	756,187			$	(32,719	)	$	1,134,957		$	(34,606	)

Held-to-Maturity
States and political subdivisions		$	6,171			$	(77	)		$	—			$	—		$	6,171		$	(77	)

Total held-to-maturity		$	6,171			$	(77	)		$	—			$	—		$	6,171		$	(77	)

2013
Available-for-Sale
U.S. Treasury		$	1,900			$	—			$	—			$	—		$	1,900		$	—
U.S. government-sponsored entities and agencies			357,793				(17,547	)			38,988				(3,452	)		396,781			(20,999	)
Mortgage-backed securities – Agency			668,018				(23,455	)			41,200				(3,112	)		709,218			(26,567	)
States and political subdivisions			45,077				(1,620	)			2,812				(95	)		47,889			(1,715	)
Pooled trust preferred securities			—				—				8,037				(11,178	)		8,037			(11,178	)
Other securities			209,915				(2,706	)			24,082				(2,817	)		233,997			(5,523	)

Total available-for-sale		$	1,282,703			$	(45,328	)		$	115,119			$	(20,654	)	$	1,397,822		$	(65,982	)

Held-to-Maturity
Mortgage-backed securities – Agency		$	21,370			$	(1	)		$	—			$	—		$	21,370		$	(1	)
States and political subdivisions			70,162				(1,579	)			—				—			70,162			(1,579	)

Total held-to-maturity		$	91,532			$	(1,580	)		$	—			$	—		$	91,532		$	(1,580	)


During the third quarter of 2013, state and political subdivision securities with a fair value of $357.8 million were transferred from the available-for-sale portfolio to the held-to-maturity portfolio. The $31.0 million unrealized holding loss at the date of transfer shall continue to be reported as a separate component of shareholders’ equity and will be amortized over the remaining life of the securities as an adjustment of yield. The corresponding discount on these securities will offset this adjustment to yield as it is amortized. We moved these securities to our held-to-maturity portfolio to better align with the percentage of these securities held by our peers and to protect our tangible common equity against rising interest rates.

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 or held-to-maturity are generally evaluated for OTTI under FASB ASC 320 (SFAS No. 115, Accounting for Certain Investments in Debt and Equity Securities). However, certain purchased beneficial interests, including non-agency mortgage-backed securities, asset-backed securities, and collateralized debt obligations, that had credit ratings at the time of purchase of below AA are evaluated using the model outlined in FASB ASC 325-10 (EITF Issue 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 (EITF 99-20) that is specific to purchased beneficial interests that, on the purchase date, were rated below AA. Under the FASB ASC 325-10 model, we compare the present value of the remaining cash flows as estimated at the preceding evaluation date to the current expected remaining cash flows. An OTTI is deemed to have occurred if there has been an adverse change in the remaining expected future cash flows.

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.

Other-than-temporary-impairments totaled $100 thousand in 2014, $1.0 million in 2013 and $1.4 million in 2012.

As of December 31, 2014, Old National’s securities portfolio consisted of 1,702 securities, 242 of which were in an unrealized loss position. The unrealized losses attributable to our U.S government-sponsored entities and agencies and agency mortgage-backed securities are the result of fluctuations in interest rates. Our pooled trust preferred securities are discussed below.

Pooled Trust Preferred Securities

At December 31, 2014, our securities portfolio contained three pooled trust preferred securities with a fair value of $6.6 million and unrealized losses of $11.4 million. One of the pooled trust preferred securities in our portfolio falls within the scope of FASB ASC 325-10 (EITF 99-20) and has a fair value of $0.2 million with an unrealized loss of $3.8 million at December 31, 2014. This security was rated A3 at inception, but at December 31, 2014, this security is rated D. The issuers in this security are banks. We use the OTTI evaluation model to compare the present value of expected cash flows to the previous estimate to determine whether an adverse change in cash flows has occurred during the quarter. The OTTI model considers the structure and term of the collateralized debt obligation (“CDO”) and the financial condition of the underlying issuers. Specifically, the model details interest rates, principal balances of note classes and underlying issuers, the timing and amount of interest and principal payments of the underlying issuers, and the allocation of the payments to the note classes. The current estimate of expected cash flows is based on the most recent trustee reports and any other relevant market information including announcements of interest payment deferrals or defaults of underlying trust preferred securities. Assumptions used in the model include expected future default rates and prepayments. We assume no recoveries on defaults and a limited number of recoveries on current or projected interest payment deferrals. In addition, we use the model to “stress” this CDO, or make assumptions more severe than expected activity, to determine the degree to which assumptions could deteriorate before the CDO could no longer fully support repayment of Old National’s note class. For the year ended December 31, 2014, our model indicated no other-than-temporary-impairment losses on this security. For the year ended December 31, 2013, we recorded a $1.0 million other-than-temporary impairment loss on this security. At December 31, 2014, we have no intent to sell any securities that are in an unrealized loss position nor is it expected that we would be required to sell any securities.



Two of our pooled trust preferred securities with a fair value of $6.4 million and unrealized losses of $7.6 million at December 31, 2014 are not subject to FASB ASC 325-10. These securities are evaluated using collateral-specific assumptions to estimate the expected future interest and principal cash flows. Our analysis indicated no other-than-temporary-impairment on these securities.

At December 31, 2013, two of our pooled trust preferred securities were subject to FASB ASC 325-10 and had a fair value of $1.2 million with unrealized losses of $3.9 million. Our analysis indicated no other-than-temporary-impairment losses on these securities.

Two of our pooled trust preferred securities with a fair value of $6.9 million and unrealized losses of $7.3 million at December 31, 2013 were not subject to FASB ASC 325-10. These securities were evaluated using collateral-specific assumptions to estimate the expected future interest and principal cash flows. Our analysis indicated no other-than-temporary-impairment on these securities.

The table below summarizes the relevant characteristics of our three pooled trust preferred securities as well as six single issuer trust preferred securities which are included with other securities in this Note to the consolidated financial statements. Each of the pooled trust preferred securities support a more senior tranche of security holders.

As depicted in the table below, all three 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, 2014		Class				Lowest				Amortized				Fair			Unrealized			Realized			# of Issuers		Actual			Expected			Excess
						Credit				Cost				Value			Gain/			Losses			Currently		Deferrals and			Defaults as			Subordination
(dollars in thousands)						Rating (1)											(Loss)			2014			Performing/		Defaults as a			a % of			as a % of
																							Remaining		Percent of			Remaining			Current
																									Original			Performing			Performing
																									Collateral			Collateral			Collateral
Pooled trust preferred securities:
Reg Div Funding 2004			B-2				D			$	4,012			$	217		$	(3,795	)	$	—			24/42		37.6	%		8	%		0	%
Pretsl XXVII LTD			B				B				4,511				2,333			(2,178	)		—			33/46		23.9	%		15	%		37.6	%
Trapeza Ser 13A			A2A				B+				9,442				4,057			(5,385	)		—			42/53		16.3	%		9.8	%		46.5	%

											17,965				6,607			(11,358	)		—
Single Issuer trust preferred securities:
First Empire Cap (M&T)							BB+				960				1,010			50			—
First Empire Cap (M&T)							BB+				2,916				3,029			113			—
Fleet Cap Tr V (BOA)							BB				3,381				2,800			(581	)		—
JP Morgan Chase Cap XIII							BBB-				4,745				4,150			(595	)		—
NB-Global							BB				751				800			49			—
Chase Cap II							BBB-				793				843			50			—

											13,546				12,632			(914	)		—
Total										$	31,511			$	19,239		$	(12,272	)	$	—



-1	Lowest rating for the security provided by any nationally recognized credit rating agency.

On July 19, 2010, financial regulatory reform legislation entitled the “Dodd-Frank Wall Street Reform and Consumer Protection Act” (the “Dodd-Frank Act”) was signed into law. The Dodd-Frank Act contains provisions (the “Volcker Rule”) prohibiting certain investments which can be held by a bank holding company. A limited partnership held by Old National falls under these restrictions and had to be divested by July 2015. In December 2014, the Federal Reserve granted a one year extension on divestiture to July 2016. An additional one year extension is expected to be approved, which would extend the conformance period to July 2017. The estimated sales proceeds for this security would be less than the amortized cost of the security, and an other-than-temporary-impairment charge of $100 thousand was recorded for this security in the first quarter of 2014.



The following table details the remaining securities with other-than-temporary-impairment, their credit rating at December 31, 2014, and the related life-to-date credit losses recognized in earnings:



(dollars in thousands)		Vintage				Lowest				Amortized				Amount of other-than-temporary
						Credit				Cost				impairment recognized in earnings
						Rating (1)								Year ended December 31,									Life-to
														2014			2013			2012			date
Reg Div Funding			2004				D			$	4,012			$	—		$	—		$	165		$	5,685
Limited partnership											667				100			—			—			100

Total										$	4,679			$	100		$	—		$	165		$	5,785



-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
Loans Held for Sale	Dec. 31, 2014
Debt Disclosure [Abstract]
Loans Held for Sale	NOTE 5 – LOANS HELD FOR SALE

	Residential loans that Old National has originated with a commitment to sell are recorded at fair value in accordance with FASB ASC 825-10 (SFAS No. 159 – The Fair Value Option for Financial Assets and Financial Liabilities). At December 31, 2014 and 2013, Old National had residential loans held for sale of $15.6 million and $7.7 million, respectively. Prior to mid-2014, residential loans originated by Old National were primarily sold on a servicing released basis. Beginning with the inception of an in-house servicing unit in the third quarter of 2014, conventional mortgage production is now sold on a servicing retained basis. Certain loans, such as government backed mortgage loans continue to be sold on servicing released basis.

	During the fourth quarter of 2014, $71.6 million residential real estate loans held for investment, $50.1 million consumer loans held for investment, $45.5 million commercial loans held for investment, and $30.7 million commercial real estate loans held for investment were reclassified to loans held for sale at the lower of cost or fair value. Old National intends to sell these loans in two separate transactions and anticipates that both will be complete prior to September 30, 2015.

	During the third quarter of 2013, residential real estate loans held for investment of $96.9 million were reclassified to loans held for sale at the lower of cost or fair value and sold for $96.9 million, resulting in no gain or loss. These longer duration loans were sold to reduce interest rate risk in the loan portfolio. At December 31, 2014, there were no loans held for sale under this arrangement.

	At June 30, 2013, Old National had taxable finance leases held for sale of $11.6 million. These leases were transferred from the commercial loan category at fair value and a loss of $0.2 million was recognized. The portfolio of leases held for sale had an average maturity of 2.7 years and interest rates ranging from 3.57% to 10.22%. The leases held for sale were to a variety of borrowers, with various types of equipment securing the leases, and all of the leases were current. The leases held for sale were sold in the third quarter of 2013 with no additional loss. As of December 31, 2014, Old National does not intend to sell its nontaxable finance leases.

	During 2013, commercial and commercial real estate loans held for investment of $5.9 million, including $0.4 million of purchased impaired loans, were reclassified to loans held for sale at the lower of cost or fair value and sold for $7.1 million, resulting in a charge-off of $0.2 million, recoveries of $0.4 million and other noninterest income of $1.0 million. At December 31, 2014, there were no loans held for sale under this arrangement.

Finance_Receivables_and_Allowa

Finance Receivables and Allowance for Credit Losses	12 Months Ended
Finance Receivables and Allowance for Credit Losses	Dec. 31, 2014
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, southeastern Illinois, western Kentucky and southwestern Michigan. Old National has no concentration of commercial 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)		2014				2013
	Commercial (1)		$	1,629,600			$	1,373,415
	Commercial real estate:
	Construction			134,552				88,630
	Other			1,576,558				1,072,260
	Residential real estate			1,519,156				1,359,569
	Consumer credit:
	Heloc			360,320				251,102
	Auto			846,969				620,473
	Other			103,338				99,683
	Covered loans			147,708				217,832

	Total loans			6,318,201				5,082,964
	Allowance for loan losses			(44,297	)			(41,741	)
	Allowance for loan losses – covered loans			(3,552	)			(5,404	)

	Net loans		$	6,270,352			$	5,035,819



	-1	Includes direct finance leases of $19.3 million and $27.8 million at December 31, 2014 and 2013, respectively.

	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. As a general rule, Old National avoids financing single purpose projects unless other underwriting factors are present to help mitigate risk. In addition, management tracks the level of owner-occupied commercial real estate loans versus non-owner occupied loans.

	Included with commercial real estate are construction loans, which are underwritten utilizing feasibility studies, independent appraisal reviews, sensitivity analysis of absorption and lease rates and financial analysis of the developers and property owners. 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 permanent loans from approved long-term lenders, sales of developed property or an interim loan commitment from Old National until permanent financing is obtained. These loans are closely monitored by on-site inspections and are considered to have higher risks than other real estate loans due to their ultimate repayment being sensitive to interest rate changes, governmental regulation of real property, general economic conditions and the availability of long-term financing.



	Residential

	With respect to residential loans that are secured by 1-4 family residences and are generally owner occupied, Old National typically establishes a maximum loan-to-value ratio and requires private mortgage insurance if that ratio is exceeded. Repayment of these loans is primarily dependent on the personal income of the borrowers, which can be impacted by economic conditions in their market areas such as unemployment levels. Repayment can also be impacted by changes in residential property values. Risk is mitigated by the fact that the loans are of smaller individual amounts and spread over a large number of borrowers.

	Consumer

	Home equity loans are typically secured by a subordinate interest in 1-4 family residences, and consumer loans are secured by consumer assets such as automobiles or recreational vehicles. Some consumer loans are unsecured such as small installment loans and certain lines of credit. Repayment of these loans is primarily dependent on the personal income of the borrowers, which can be impacted by economic conditions in their market areas such as unemployment levels. Repayment can also be impacted by changes in residential property values. Risk is mitigated by the fact that the loans are of smaller individual amounts and spread over a large number of borrowers.

	Covered Loans

	Covered loans represent loans acquired from the FDIC that are subject to loss share agreements whereby Old National is indemnified against 80% of losses up to $275.0 million, losses in excess of $275.0 million up to $467.2 million at 0% reimbursement, and 80% of losses in excess of $467.2 million. As of December 31, 2014, we do not expect losses to exceed $275.0 million. 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 2014 is presented in the following table:



(dollars in thousands)		2014
Balance, January 1		$	12,750
New loans			5,101
Repayments			(4,896	)
Officer and director changes			7,605

Balance, December 31		$	20,560


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.

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. Purchased credit impaired (“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. Impairment on PCI loans would be recognized in the current period as provision expense.



Old National’s activity in the allowance for loan losses for the years ended December 31, 2014, 2013 and 2012 is as follows:



(dollars in thousands)		Commercial				Commercial				Consumer			Residential			Unallocated			Total
(dollars in thousands)		Commercial				Real Estate				Consumer			Residential			Unallocated			Total
2014
Allowance for loan losses:
Beginning balance		$	16,565			$	22,401			$	4,940		$	3,239		$	—		$	47,145
Charge-offs			(3,396	)			(2,352	)			(4,675	)		(793	)		—			(11,216	)
Recoveries			2,986				2,576				3,056			205			—			8,823
Provision			4,515				(5,277	)			3,548			311			—			3,097

Ending balance		$	20,670			$	17,348			$	6,869		$	2,962		$	—		$	47,849

2013
Allowance for loan losses:
Beginning balance		$	14,642			$	31,289			$	5,155		$	3,677		$	—		$	54,763
Charge-offs			(3,810	)			(5,427	)			(6,279	)		(1,487	)		—			(17,003	)
Recoveries			4,098				2,963				4,333			310			—			11,704
Provision			1,635				(6,424	)			1,731			739			—			(2,319	)

Ending balance		$	16,565			$	22,401			$	4,940		$	3,239		$	—		$	47,145

2012
Allowance for loan losses:
Beginning balance		$	19,964			$	26,993			$	6,954		$	4,149		$	—		$	58,060
Charge-offs			(7,636	)			(4,386	)			(8,094	)		(2,204	)		—			(22,320	)
Recoveries			5,166				5,104				3,259			464			—			13,993
Provision			(2,852	)			3,578				3,036			1,268			—			5,030

Ending balance		$	14,642			$	31,289			$	5,155		$	3,677		$	—		$	54,763




The following table provides Old National’s recorded investment in financing receivables by portfolio segment at December 31, 2014 and 2013 and other information regarding the allowance:



(dollars in thousands)		Commercial				Commercial				Consumer			Residential			Unallocated			Total
(dollars in thousands)		Commercial				Real Estate				Consumer			Residential			Unallocated			Total
2014
Allowance for credit losses:
Ending balance: individually evaluated for impairment		$	7,280			$	2,945			$	—		$	—		$	—		$	10,225

Ending balance: collectively evaluated for impairment		$	12,163			$	13,354			$	6,519		$	2,945		$	—		$	34,981

Ending balance: noncovered loans acquired with deteriorated credit quality		$	406			$	1,049			$	67		$	17		$	—		$	1,539

Ending balance: covered loans acquired with deteriorated credit quality		$	821			$	—			$	283		$	—		$	—		$	1,104

Total allowance for credit losses		$	20,670			$	17,348			$	6,869		$	2,962		$	—		$	47,849

Loans and leases outstanding:
Ending balance: individually evaluated for impairment		$	38,485			$	45,335			$	—		$	—		$	—		$	83,820

Ending balance: collectively evaluated for impairment		$	1,598,352			$	1,631,794			$	1,359,537		$	1,519,171		$	—		$	6,108,854

Ending balance: loans acquired with deteriorated credit quality		$	2,770			$	37,394			$	7,073		$	133		$	—		$	47,370

Ending balance: covered loans acquired with deteriorated credit quality		$	7,160			$	37,384			$	12,507		$	21,106		$	—		$	78,157

Total loans and leases outstanding		$	1,646,767			$	1,751,907			$	1,379,117		$	1,540,410		$	—		$	6,318,201




(dollars in thousands)		Commercial				Commercial				Consumer			Residential			Unallocated			Total
(dollars in thousands)		Commercial				Real Estate				Consumer			Residential			Unallocated			Total
2013
Allowance for credit losses:
Ending balance: individually evaluated for impairment		$	6,156			$	2,190			$	—		$	—		$	—		$	8,346

Ending balance: collectively evaluated for impairment		$	9,980			$	14,816			$	4,494		$	3,088		$	—		$	32,378

Ending balance: noncovered loans acquired with deteriorated credit quality		$	429			$	2,025			$	80		$	35		$	—		$	2,569

Ending balance: covered loans acquired with deteriorated credit quality		$	—			$	3,370			$	366		$	116		$	—		$	3,852

Total allowance for credit losses		$	16,565			$	22,401			$	4,940		$	3,239		$	—		$	47,145

Loans and leases outstanding:
Ending balance: individually evaluated for impairment		$	34,213			$	34,997			$	—		$	—		$	—		$	69,210

Ending balance: collectively evaluated for impairment		$	1,355,608			$	1,106,971			$	1,019,576		$	1,359,564		$	—		$	4,841,719

Ending balance: loans acquired with deteriorated credit quality		$	648			$	23,618			$	12,725		$	154		$	—		$	37,145

Ending balance: covered loans acquired with deteriorated credit quality		$	12,281			$	77,232			$	17,673		$	27,704		$	—		$	134,890

Total loans and leases outstanding		$	1,402,750			$	1,242,818			$	1,049,974		$	1,387,422		$	—		$	5,082,964


Credit Quality

Old National’s management monitors the credit quality of its financing receivables in an on-going manner. Internally, management assigns a credit quality grade to each non-homogeneous commercial and commercial real estate loan in the portfolio. The primary determinants of the credit quality grade are based upon the reliability of the primary source of repayment and the past, present, and projected financial condition of the borrower. The credit quality rating also reflects current economic and industry conditions. Major factors used in determining the grade can vary based on the nature of the loan, but commonly include factors such as debt service coverage, internal cash flow, liquidity, leverage, operating performance, debt burden, FICO scores, occupancy, interest rate sensitivity, and expense burden. Old National uses the following definitions for risk ratings:

Criticized. Special mention loans that have a potential weakness that deserves management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the loan or of the institution’s credit position at some future date.

Classified – Substandard. Loans classified as substandard are inadequately protected by the current net worth and paying capacity of the obligor or of the collateral pledged, if any. Loans so classified have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. They are characterized by the distinct possibility that the institution will sustain some loss if the deficiencies are not corrected.

Classified – Nonaccrual. Loans classified as nonaccrual have all the weaknesses inherent in those classified as substandard, with the added characteristic that the weaknesses make collection in full, on the basis of currently existing facts, conditions, and values, in doubt.



Classified – Doubtful. Loans classified as doubtful have all the weaknesses inherent in those classified as nonaccrual, with the added characteristic that the weaknesses make collection in full, on the basis of currently existing facts, conditions, and values, highly questionable and improbable.

Pass rated loans are those loans that are other than criticized, classified – substandard, classified – nonaccrual or classified – doubtful.

As of December 31, 2014 and 2013, the risk category of loans, excluding covered loans, by class of loans is as follows:



(dollars in thousands)		Commercial								Commercial Real Estate-						Commercial Real Estate-
										Construction						Other
Corporate Credit Exposure Credit Risk Profile by Internally
Assigned Grade		2014				2013				2014			2013			2014			2013
Grade:
Pass		$	1,442,904			$	1,237,983			$	119,958		$	74,815		$	1,374,191		$	943,781
Criticized			89,775				90,545				2,229			9,383			102,805			35,473
Classified – substandard			58,461				16,252				5,866			2,559			38,659			42,516
Classified – nonaccrual			38,003				27,635				6,499			1,873			59,771			49,406
Classified – doubtful			457				1,000				—			—			1,132			1,084

Total		$	1,629,600			$	1,373,415			$	134,552		$	88,630		$	1,576,558		$	1,072,260


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, 2014 and 2013, excluding covered loans:



2014		Consumer											Residential
(dollars in thousands)		Heloc				Auto				Other			Residential
Performing		$	357,205			$	845,708			$	101,811		$	1,505,188
Nonperforming			3,115				1,261				1,527			13,968

Total		$	360,320			$	846,969			$	103,338		$	1,519,156


2013		Consumer											Residential
(dollars in thousands)		Heloc				Auto				Other			Residential
Performing		$	249,152			$	618,911			$	97,877		$	1,349,236
Nonperforming			1,950				1,562				1,806			10,333

Total		$	251,102			$	620,473			$	99,683		$	1,359,569


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. No additional funds are committed to be advanced in connection with these impaired loans.



The following table shows Old National’s impaired loans, excluding covered loans, which are individually evaluated as of December 31, 2014 and 2013, respectively. Of the loans purchased without FDIC loss share coverage, only those that have experienced subsequent impairment since the date acquired are included in the table below.



(dollars in thousands)		Recorded				Unpaid				Related
		Investment				Principal				Allowance
						Balance
December 31, 2014
With no related allowance recorded:
Commercial		$	25,483			$	25,854			$	—
Commercial Real Estate – Construction			2,168				1,397				—
Commercial Real Estate – Other			28,637				30,723				—
Consumer			685				748				—
Residential			588				658				—
With an allowance recorded:
Commercial			7,471				10,488				4,883
Commercial Real Estate – Construction			98				98				11
Commercial Real Estate – Other			14,432				16,503				2,934
Consumer			1,543				1,543				77
Residential			1,476				1,476				74

Total Loans		$	82,581			$	89,488			$	7,979

December 31, 2013
With no related allowance recorded:
Commercial		$	17,066			$	17,417			$	—
Commercial Real Estate – Construction			525				633				—
Commercial Real Estate – Other			15,746				22,550				—
Consumer			324				342				—
Residential			106				106				—
With an allowance recorded:
Commercial			9,282				12,304				4,723
Commercial Real Estate – Construction			—				—				—
Commercial Real Estate – Other			18,726				19,358				2,190
Consumer			835				888				43
Residential			2,239				2,295				112

Total Loans		$	64,849			$	75,893			$	7,068




The average balance of impaired loans, excluding covered loans, and interest income recognized on impaired loans for the years ended December 31, 2014 and 2013 are included in the table below.



(dollars in thousands)		Average				Interest
		Recorded				Income
		Investment				Recognized (1)
December 31, 2014
With no related allowance recorded:
Commercial		$	21,592			$	325
Commercial Real Estate – Construction			1,347				69
Commercial Real Estate – Other			21,560				328
Consumer			505				14
Residential			347				1
With an allowance recorded:
Commercial			7,579				94
Commercial Real Estate – Construction			49				4
Commercial Real Estate – Other			12,160				409
Consumer			1,189				58
Residential			1,857				69

Total Loans		$	68,185			$	1,371

December 31, 2013
With no related allowance recorded:
Commercial		$	11,815			$	135
Commercial Real Estate – Construction			852				—
Commercial Real Estate – Other			16,345				140
Consumer			138				10
Residential			62				1
With an allowance recorded:
Commercial			16,351				123
Commercial Real Estate – Construction			1,614				—
Commercial Real Estate – Other			22,317				134
Consumer			526				40
Residential			1,180				73

Total Loans		$	71,200			$	656



-1	The Company does not record interest on nonaccrual loans until principal is recovered.

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 are returned to accrual status when all the principal and interest amounts contractually due are brought current, remain current for six months and future payments are reasonably assured.

Loans accounted for under FASB 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 covered loan loss provision or prospective yield adjustments. Similar to noncovered loans, covered loans accounted for outside FASB ASC Topic 310-30 are classified as nonaccrual when, in the opinion of management, collection of principal or interest is doubtful. Information for covered loans accounted for both under and outside FASB ASC Topic 310-30 is included in the table below in the row labeled covered loans.



Old National’s past due financing receivables as of December 31 are as follows:



(dollars in thousands)		30-59 Days				60-89 Days				Recorded			Nonaccrual			Total			Current
		Past Due				Past Due				Investment >						Past Due
										90 Days and
										Accruing
December 31, 2014
Commercial		$	649			$	813			$	33		$	38,460		$	39,955		$	1,589,645
Commercial Real Estate:
Construction			—				—				—			6,499			6,499			128,053
Other			3,834				1,468				138			60,903			66,343			1,510,215
Consumer:
Heloc			577				376				—			3,115			4,068			356,252
Auto			3,349				695				203			1,261			5,508			841,461
Other			969				129				83			1,527			2,708			100,630
Residential			11,606				3,959				1			13,968			29,534			1,489,622
Covered loans			1,477				584				—			15,124			17,185			130,523

Total		$	22,461			$	8,024			$	458		$	140,857		$	171,800		$	6,146,401

December 31, 2013
Commercial		$	1,532			$	13			$	—		$	28,635		$	30,180		$	1,343,235
Commercial Real Estate:
Construction			—				139				—			1,873			2,012			86,618
Other			1,017				27				—			50,490			51,534			1,020,726
Consumer:
Heloc			527				119				—			1,950			2,596			248,506
Auto			3,795				716				89			1,562			6,162			614,311
Other			844				317				100			1,806			3,067			96,616
Residential			8,588				2,823				35			10,333			21,779			1,337,790
Covered Loans			1,831				730				14			31,793			34,368			183,464

Total		$	18,134			$	4,884			$	238		$	128,442		$	151,698		$	4,931,266


Loan Participations

Old National has loan participations, which qualify as participating interests, with other financial institutions. At December 31, 2014, these loans totaled $285.9 million, of which $160.1 million had been sold to other financial institutions and $125.8 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 included 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. It is Old National’s policy to charge 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 consumer or residential loan is identified as a troubled debt restructuring, the loan is written down to its collateral value less selling costs.

At December 31, 2014, our TDRs consisted of $15.2 million of commercial loans, $15.2 million of commercial real estate loans, $2.5 million of consumer loans and $2.1 million of residential loans, totaling $35.0 million. Approximately $22.1 million of the TDRs at December 31, 2014 were included with nonaccrual loans. At December 31, 2013, our TDRs consisted of $22.5 million of commercial loans, $22.6 million of commercial real estate loans, $1.4 million of consumer loans and $2.4 million of residential loans, totaling $48.9 million. Approximately $33.1 million of the TDRs at December 31, 2013 were included with nonaccrual loans.

As of December 31, 2014 and 2013, Old National has allocated $2.8 million and $4.1 million of specific reserves to customers whose loan terms have been modified in TDRs, respectively. As of December 31, 2014, Old National had committed to lend an additional $1.1 million to customers with outstanding loans that are classified as TDRs.

The pre-modification and post-modification outstanding recorded investments of loans modified as TDRs during the years ended December 31, 2014 and 2013 are the same since the loan modifications did not involve the forgiveness of principal. Old National did not record any charge-offs at the modification date. The following table presents loans by class modified as TDRs that occurred during the year ended December 31, 2014:



(dollars in thousands)		Number of				Pre-modification				Post-modification
		Loans				Outstanding Recorded				Outstanding Recorded
						Investment				Investment
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 – other			28				1,586				1,586

Total			97			$	19,011			$	19,011


The TDRs described above increased the allowance for loan losses by $0.5 million and resulted in charge-offs of $0.1 million during 2014.



The following table presents loans by class modified as TDRs that occurred during the year ended December 31, 2013:



(dollars in thousands)		Number of				Pre-modification				Post-modification
		Loans				Outstanding Recorded				Outstanding Recorded
						Investment				Investment
Troubled Debt Restructuring:
Commercial			35			$	15,155			$	15,155
Commercial Real Estate – construction			1				60				60
Commercial Real Estate – other			36				9,791				9,791
Residential			14				1,901				1,901
Consumer – other			49				1,484				1,484

Total			135			$	28,391			$	28,391


The TDRs described above increased the allowance for loan losses by $0.1 million and resulted in charge-offs of $0.2 million during 2013.

A loan is considered to be in payment default once it is 90 days contractually past due under the modified terms.

There were no loans that were modified as TDRs during 2014 for which there was a payment default within the last twelve months.

The following table presents loans by class modified as TDRs for which there was a payment default within the last twelve months following the modification during the year ended December 31, 2013.



(dollars in thousands)		Number of				Recorded
(dollars in thousands)		Contracts				Investment
Troubled Debt Restructuring
That Subsequently Defaulted:
Commercial			3			$	32
Commercial Real Estate			2				85

Total			5			$	117


The TDRs that subsequently defaulted described above had no material impact on the allowance for loan losses and resulted in charge-offs of $0.1 million during 2013.

The terms of certain other loans were modified during the year ended December 31, 2014 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 if the delay in a payment was 90 days or less.

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, 2014, 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, recent guidance also permits for loans to be removed from TDR status 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, “Receivables – Overall”. However, consistent with ASC 310-40-50-2, “Troubled Debt Restructurings by Creditors, Creditor Disclosure of Troubled Debt Restructurings,” the loan would not be required to be reported in the years following the restructuring if the subsequent restructuring meets both of these criteria: (1) has an interest rate at the time of the subsequent restructuring that is not less than a market interest rate; and (2) is performing in compliance with its modified terms after the subsequent restructuring.

The following table presents activity in TDRs for the years ended December 31, 2014 and 2013:



(dollars in thousands)		Commercial				Commercial				Consumer			Residential			Total
(dollars in thousands)		Commercial				Real Estate				Consumer			Residential			Total
2014
Troubled debt restructuring:
Balance, January 1, 2014		$	22,443			$	22,639			$	1,441		$	2,344		$	48,867
(Charge-offs)/recoveries			126				795				(102	)		10			829
Payments			(18,281	)			(9,722	)			(466	)		(466	)		(28,935	)
Additions			13,696				3,554				1,586			175			19,011
Removals – subsequent restructuring			(2,779	)			(2,040	)			—			—			(4,819	)

Balance December 31, 2014		$	15,205			$	15,226			$	2,459		$	2,063		$	34,953

2013
Troubled debt restructuring:
Balance, January 1, 2013		$	12,660			$	18,422			$	473		$	499		$	32,054
(Charge-offs)/recoveries			879				1				(61	)		1			820
Payments			(6,251	)			(5,635	)			(455	)		(57	)		(12,398	)
Additions			15,155				9,851				1,484			1,901			28,391

Balance December 31, 2013		$	22,443			$	22,639			$	1,441		$	2,344		$	48,867


Purchased Impaired Loans (noncovered loans)

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 the remaining life of the acquired loans, estimated prepayments, estimated loss ratios, estimated value of the underlying collateral, net present value of cash flows expected to be received, among others. 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.



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 noncovered loans that meet the criteria of ASC 310-30 treatment, the carrying amount is as follows:



		December 31,
(dollars in thousands)		2014				2013
Commercial		$	2,770			$	648
Commercial real estate			37,394				23,618
Consumer			7,073				12,725
Residential			133				154

Outstanding balance		$	47,370			$	37,145

Carrying amount, net of allowance		$	45,831			$	34,576

Allowance for loan losses		$	1,539			$	2,569


The outstanding balance of noncovered loans accounted for under ASC 310-30, including contractual principal, interest, fees and penalties, was $135.9 million and $115.0 million as of December 31, 2014 and 2013, respectively.

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 of $16.0 million has been recorded as loan interest income in 2014. Accretion of $16.8 million has been recorded as loan interest income in 2013. Improvement in cash flow expectations has resulted in a reclassification from nonaccretable difference to accretable yield.

Accretable yield of noncovered loans, or income expected to be collected, is as follows:



(dollars in thousands)		Monroe				Integra				IBT			Tower			United			LSB			Total
(dollars in thousands)		Monroe				Noncovered				IBT			Tower			United			LSB			Total
Balance at January 1, 2014		$	6,787			$	2,425			$	19,079		$	—		$	—		$	—		$	28,291
New loans purchased			—				—				—			4,065			1,605			2,604			8,274
Accretion of income			(2,875	)			(823	)			(10,771	)		(984	)		(336	)		(195	)		(15,984	)
Reclassifications from (to) nonaccretable difference			(1,185	)			(117	)			5,046			1,478			247			—			5,469
Disposals/other adjustments			837				(96	)			—			—			—			—			741

Balance at December 31, 2014		$	3,564			$	1,389			$	13,354		$	4,559		$	1,516		$	2,409		$	26,791


Included in Old National’s allowance for loan losses is $1.5 million related to the purchased loans disclosed above for 2014 and $2.6 million for 2013. An immaterial amount of allowances for loan losses were reversed during 2014 and 2013 related to these loans.

At acquisition, purchased loans, both covered and noncovered, for which it was probable at acquisition that all contractually required payments would not be collected were as follows:



(dollars in thousands)		Monroe				Integra				IBT			Tower			United			LSB
(dollars in thousands)		Bancorp				Bank (1)				IBT			Tower			United			LSB
Contractually required payments		$	94,714			$	921,856			$	118,535		$	22,746		$	15,483		$	24,493
Nonaccretable difference			(45,157	)			(226,426	)			(53,165	)		(5,826	)		(5,487	)		(9,903	)

Cash flows expected to be collected at acquisition			49,557				695,430				65,370			16,920			9,996			14,590
Accretable yield			(6,971	)			(98,487	)			(11,945	)		(4,065	)		(1,605	)		(2,604	)

Fair value of acquired loans at acquisition		$	42,586			$	596,943			$	53,425		$	12,855		$	8,391		$	11,986



-1	Includes covered and noncovered.



Income is not recognized on certain purchased loans if Old National cannot 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
Covered Loans	Dec. 31, 2014
Text Block [Abstract]
Covered Loans	NOTE 7 – COVERED LOANS

	Covered loans represent loans acquired from the FDIC that are subject to loss share agreements. The composition of covered loans by lending classification was as follows:



	At December 31, 2014
	(dollars in thousands)		Loans Accounted for				Loans excluded from			Total Covered
			Under ASC 310-30				ASC 310-30 (1)			Purchased Loans
			(Purchased Credit				(Not Purchased Credit
			Impaired)				Impaired)
	Commercial		$	7,160			$	10,007		$	17,167
	Commercial real estate			37,384				3,413			40,797
	Residential			21,106				148			21,254
	Consumer			12,507				55,983			68,490

	Covered loans			78,157				69,551			147,708
	Allowance for loan losses			(1,104	)			(2,448	)		(3,552	)

	Covered loans, net		$	77,053			$	67,103		$	144,156



	-1	Includes loans with revolving privileges which are scoped out of FASB ASC Topic 310-30 and certain loans which Old National elected to treat under the cost recovery method of accounting.

	Loans were recorded at fair value in accordance with FASB ASC 805, Business Combinations. No allowance for loan losses related to the acquired loans is recorded on the acquisition date as the fair value of the loans acquired incorporates assumptions regarding credit risk. Loans acquired are recorded at fair value in accordance with the fair value methodology prescribed in FASB ASC 820, exclusive of the loss share agreements with the FDIC. The fair value estimates associated with the loans include estimates related to expected prepayments and the amount and timing of undiscounted expected principal, interest and other cash flows.

	The outstanding balance of covered loans accounted for under ASC 310-30, including contractual principal, interest, fees and penalties, was $241.9 million and $406.3 million as of December 31, 2014 and 2013, respectively. The carrying amount of covered loans was $147.7 million and $217.8 million as of December 31, 2014 and 2013, respectively.



	The following table is a roll-forward of acquired impaired loans accounted for under ASC 310-30 for the years ended December 31, 2014 and 2013:



	(dollars in thousands)		Contractual				Nonaccretable			Accretable			Carrying
	(dollars in thousands)		Cash Flows (1)				Difference			Yield			Amount (2)
	2014
	Balance at January 1, 2014		$	251,042			$	(46,793	)	$	(73,211	)	$	131,038
	Principal reductions and interest payments			(109,254	)			(2,145	)		(940	)		(112,339	)
	Accretion of loan discount			—				—			61,945			61,945
	Changes in contractual and expected cash flows due to remeasurement			(9,935	)			34,692			(22,067	)		2,690
	Removals due to foreclosure or sale			(7,044	)			2,232			(1,469	)		(6,281	)

	Balance at December 31, 2014		$	124,809			$	(12,014	)	$	(35,742	)	$	77,053

	2013
	Balance at January 1, 2013		$	424,527			$	(90,996	)	$	(85,779	)	$	247,752
	Principal reductions and interest payments			(144,512	)			—			—			(144,512	)
	Accretion of loan discount			—				—			35,363			35,363
	Changes in contractual and expected cash flows due to remeasurement			(20,242	)			43,424			(21,608	)		1,574
	Removals due to foreclosure or sale			(8,731	)			779			(1,187	)		(9,139	)

	Balance at December 31, 2013		$	251,042			$	(46,793	)	$	(73,211	)	$	131,038



	-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.

	Over the life of the acquired loans, we continue to estimate 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 evaluate at each balance sheet date whether the present value of its loans determined using the effective interest rates has decreased and if so, recognize a provision for loan losses. For any increases in cash flows expected to be collected, we adjust 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 are offset as Old National will recognize a corresponding decrease in cash flows expected from the indemnification asset prospectively in a similar manner. The indemnification asset is adjusted over the shorter of the life of the underlying investment or the indemnification agreement.

	Accretable yield, or income expected to be collected on the covered loans accounted for under ASC 310-30, is as follows:



(dollars in thousands)		2014				2013
Balance at January 1,		$	73,211			$	85,779
Accretion of income			(61,945	)			(35,363	)
Reclassifications from (to) nonaccretable difference			22,067				21,608
Disposals/other adjustments			2,409				1,187

Balance at December 31,		$	35,742			$	73,211


At December 31, 2014, the $20.6 million loss sharing asset is comprised of an $18.5 million FDIC indemnification asset and a $2.1 million FDIC loss share receivable. The loss share receivable represents actual incurred losses where reimbursement has not yet been received from the FDIC. The indemnification asset represents future cash flows we expect to collect from the FDIC under the loss sharing agreements and the amount related to the estimated improvements in cash flow expectations that are being amortized over the same period for which those improved cash flows are being accreted into income. At December 31, 2014, $8.8 million of the FDIC indemnification asset is related to expected indemnification payments and $9.7 million is expected to be amortized and reported in noninterest income as an offset to future accreted interest income. At December 31, 2013, $41.5 million of the FDIC indemnification asset was related to expected indemnification payments and $32.2 million was expected to be amortized and reported in noninterest income as an offset to future accreted interest income.



For covered loans, we remeasure contractual and expected cash flows on a quarterly basis. When the quarterly re-measurement process results in a decrease in expected cash flows due to an increase in expected credit losses, impairment is recorded. As a result of this impairment, the indemnification asset is increased to reflect anticipated future cash flows to be received from the FDIC. Consistent with the loss sharing agreements between Old National and the FDIC, the amount of the increase to the indemnification asset is measured at 80% of the resulting impairment.

Alternatively, when the quarterly re-measurement results in an increase in expected future cash flows due to a decrease in expected credit losses, the nonaccretable difference decreases and the effective yield of the related loan portfolio is increased. As a result of the improved expected cash flows, the indemnification asset would be reduced first by the amount of any impairment previously recorded and, second, by increased amortization over the remaining life of the related loss sharing agreements or the remaining life of the indemnification asset, whichever is shorter.

The following table shows a detailed analysis of the FDIC loss sharing asset for the years ended December 31, 2014 and 2013:



(dollars in thousands)		2014				2013
Balance at January 1,		$	88,513			$	116,624
Adjustments not reflected in income:
Cash received from the FDIC			(26,342	)			(19,527	)
Other			1,594				704
Adjustments reflected in income:
(Amortization) accretion			(41,611	)			(10,072	)
Impairment			59				32
Write-downs/sale of other real estate			(1,610	)			1,933
Recovery amounts due to FDIC			—				(1,243	)
Other			—				62

Balance at December 31,		$	20,603			$	88,513

Other_Real_Estate_Owned

Other Real Estate Owned	12 Months Ended
Other Real Estate Owned	Dec. 31, 2014
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, 2014 and 2013:


	(dollars in thousands)		Other Real Estate			Other Real Estate
	(dollars in thousands)		Owned (1)			Owned, Covered
	2014
	Balance, January 1, 2014		$	7,562		$	13,670
	Additions			7,064			8,480
	Sales			(5,856	)		(11,164	)
	Gains (losses)/Write-downs			(1,529	)		(1,865	)

	Balance, December 31, 2014		$	7,241		$	9,121


	2013
	Balance, January 1, 2013		$	11,179		$	26,137
	Additions			7,278			6,368
	Sales			(9,316	)		(14,813	)
	Gains (losses)/Write-downs			(1,579	)		(4,022	)

	Balance, December 31, 2013		$	7,562		$	13,670


	-1	Includes repossessed personal property of $0.2 million at December 31, 2014 and $0.3 million at December 31, 2013.

	Covered OREO expenses and valuation write-downs are recorded in the noninterest expense section of the consolidated statements of income. Under the loss sharing agreements, the FDIC will reimburse us for 80% of expenses and valuation write-downs related to covered assets up to $275.0 million, losses in excess of $275.0 million up to $467.2 million at 0%, and 80% of losses in excess of $467.2 million. As of December 31, 2014, we do not expect losses to exceed $275.0 million. The reimbursable portion of these expenses is recorded in the FDIC indemnification asset. Changes in the FDIC indemnification asset are recorded in the noninterest income section of the consolidated statements of income.

Goodwill_and_Other_Intangible_

Goodwill and Other Intangible Assets	12 Months Ended
Goodwill and Other Intangible Assets	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	NOTE 9 – GOODWILL AND OTHER INTANGIBLE ASSETS
	The following table shows the changes in the carrying amount of goodwill by segment for the years ended December 31, 2014 and 2013:


	(dollars in thousands)	Banking		Insurance			Other		Total
	Balance, January 1, 2014	$	312,856	$	39,873		$	—	$	352,729
	Goodwill acquired during the period		178,116		—			—		178,116

	Balance, December 31, 2014	$	490,972	$	39,873		$	—	$	530,845


	Balance, January 1, 2013	$	298,947	$	39,873		$	—	$	338,820
	Goodwill acquired during the period		13,909		—			—		13,909

	Balance, December 31, 2013	$	312,856	$	39,873		$	—	$	352,729

	Goodwill is reviewed annually for impairment. Old National completed its most recent annual goodwill impairment test as of August 31, 2014 and concluded that, based on current events and circumstances, it is not more likely than not that the carry value of goodwill exceeds fair value. During the fourth quarter of 2014, Old National recorded $40.0 million of goodwill associated with the acquisition of LSB which was allocated to the “Banking” segment. During the third quarter of 2014, Old National recorded $82.0 million of goodwill associated with the acquisition of United which was allocated to the “Banking” segment. During the second quarter of 2014, Old National recorded $56.2 million of goodwill associated with the acquisition of Tower which was allocated to the “Banking” segment. During the third quarter of 2013, Old National recorded $13.3 million of goodwill associated with the acquisition of 24 retail bank branches from Bank of America. This was allocated to the “Banking” segment. During the second quarter of 2013, Old National recorded $0.6 million of goodwill primarily related to the final pension settlement associated with the Indiana Community Bancorp (“IBT”) acquisition. This was allocated to the “Banking” segment. The final purchase price allocation resulted in goodwill of $86.2 million associated with the IBT acquisition.

	The gross carrying amounts and accumulated amortization of other intangible assets at December 31, 2014 and 2013 was as follows:


	(dollars in thousands)	Gross Carrying		Accumulated			Net Carrying
	(dollars in thousands)	Amount		Amortization			Amount
	2014
	Amortized intangible assets:
	Core deposit	$	57,149	$	(36,950	)	$	20,199
	Customer business relationships		27,942		(21,438	)		6,504
	Customer trust relationships		13,986		(3,232	)		10,754
	Customer loan relationships		4,413		(3,176	)		1,237

	Total intangible assets	$	103,490	$	(64,796	)	$	38,694

	2013
	Amortized intangible assets:
	Core deposit	$	44,021	$	(31,266	)	$	12,755
	Customer business relationships		27,848		(19,826	)		8,022
	Customer trust relationships		5,352		(1,810	)		3,542
	Customer loan relationships		4,413		(2,775	)		1,638

	Total intangible assets	$	81,634	$	(55,677	)	$	25,957

	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 the fourth quarter of 2014, Old National increased core deposit intangibles by $2.6 million related to the LSB acquisition, which is included in the “Banking” segment. Also during the fourth quarter of 2014, Old National decreased customer business relationship intangibles by $0.2 million related to an adjustment to the purchase of an insurance book of business, which is included in the “Insurance” segment. During the third quarter of 2014, Old National increased core deposit intangibles by $5.9 million related to the United acquisition, which is included in the “Banking” segment. Also during the third quarter of 2014, Old National increased customer trust relationship intangibles by $4.9 million associated with the trust business of United, which is included in the “Banking” segment. During the second quarter of 2014, Old National increased core deposit intangibles by $4.6 million related to the Tower acquisition, which is included in the “Banking” segment. Also during the second quarter of 2014, Old National increased customer trust relationship intangibles by $3.8 million associated with the trust business of Tower, which is included in the “Banking” segment. Also during the second quarter of 2014, Old National increased customer business relationship intangibles by $0.3 million related to the purchase of an insurance book of business, which is included in the “Insurance” segment. During the fourth quarter of 2013, Old National increased customer business relationships by $1.3 million related to the purchase of an insurance book of business, which is included in the “Insurance” segment. During the third quarter of 2013, Old National increased core deposit intangibles by $3.5 million related to the acquisition of 24 retail bank branches from Bank of America, which is included in the “Banking” segment. During the second quarter of 2013, Old National increased customer business relationships by $0.1 million related to the purchase of an insurance book of business, which is included in the “Insurance” segment. Also during the second quarter of 2013, Old National decreased customer business relationships by $0.1 million related to the sale of an insurance book of business, which is included in the “Insurance” segment. See Note 25 to the consolidated financial statements for a description of the Company’s operating segments.
	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 2014, 2013 or 2012. Total amortization expense associated with intangible assets was $9.1 million in 2014, $8.2 million in 2013 and $7.9 million in 2012. Included in expense for the first quarter of 2013 is $0.6 million related to the branch sales that occurred in the first quarter.

	Estimated amortization expense for future years is as follows:


	(dollars in thousands)
	2015	$	10,118
	2016		8,381
	2017		6,287
	2018		4,743
	2019		3,491
	Thereafter		5,674

	Total	$	38,694

Loan_Servicing_Rights

Loan Servicing Rights	12 Months Ended
Loan Servicing Rights	Dec. 31, 2014
Text Block [Abstract]
Loan Servicing Rights	NOTE 10 – LOAN SERVICING RIGHTS
	On July 31, 2014, Old National closed on its acquisition of United and assumed loan servicing rights with a fair value of $9.0 million. On November 1, 2014, Old National closed on its acquisition of LSB and assumed loan servicing rights with a fair value of $1.0 million. At December 31, 2014, loan servicing rights derived from loans sold with servicing retained were $9.5 million and were included in Other Assets in the consolidated balance sheet. Loans serviced for others are not reported as assets. The principal balance of loans serviced for others was $1.1 billion at December 31, 2014. Approximately 95% of the loans serviced for others were residential mortgage loans. Custodial escrow balances maintained in connection with serviced loans were $16.5 million at December 31, 2014.
	The following table summarizes the activity related to loan servicing rights and the related valuation allowance at December 31, 2014:


	(dollars in thousands)	2014
	Balance at January 1	$	—
	Additions		10,310
	Amortization		(726	)

	Balance before valuation allowance, December 31		9,584

	Valuation allowance:		—
	Balance at January 1		—
	Additions		(50	)

	Balance, December 31		(50	)

	Loan servicing rights, net	$	9,534

	At December 31, 2014, the fair value of servicing rights was $9.5 million. Fair value at December 31, 2014 was determined using a discount rate of 12% and a weighted average prepayment speed of 192% PSA.

Deposits

Deposits	12 Months Ended
Deposits	Dec. 31, 2014
Banking and Thrift [Abstract]
Deposits	NOTE 11 – DEPOSITS

	The aggregate amount of time deposits in denominations of $250,000 or more was $80.7 million at December 31, 2014 and $58.5 million at December 31, 2013. At December 31, 2014, the scheduled maturities of total time deposits were as follows:



	(dollars in thousands)
	Due in 2015	$	601,243
	Due in 2016		257,087
	Due in 2017		98,146
	Due in 2018		59,874
	Due in 2019		46,822
	Thereafter		25,846

	Total	$	1,089,018

ShortTerm_Borrowings

Short-Term Borrowings	12 Months Ended
Short-Term Borrowings	Dec. 31, 2014
Debt Disclosure [Abstract]
Short-Term Borrowings	NOTE 12 – SHORT-TERM BORROWINGS
	The following table presents the distribution of Old National’s short-term borrowings and related weighted-average interest rates for each of the years ended December 31:


	(dollars in thousands)	Federal Funds			Repurchase			Total
		Purchased			Agreements /
					Sweeps
	2014
	Outstanding at year-end	$	195,188		$	356,121		$	551,309
	Average amount outstanding		77,512			327,407			404,919
	Maximum amount outstanding at any month-end		195,188			356,121
	Weighted average interest rate:
	During year		0.23	%		0.07	%		0.08	%
	End of year		0.17			0.05			0.09
	2013
	Outstanding at year-end	$	115,103		$	347,229		$	462,332
	Average amount outstanding		176,033			341,620			517,653
	Maximum amount outstanding at any month-end		466,861			425,191
	Weighted average interest rate:
	During year		0.22	%		0.07	%		0.12	%
	End of year		0.2			0.05			0.09

Financing_Activities

Financing Activities	12 Months Ended
Financing Activities	Dec. 31, 2014
Debt Disclosure [Abstract]
Financing Activities	NOTE 13 – FINANCING ACTIVITIES

	The following table summarizes Old National and its subsidiaries’ other borrowings at December 31:



	(dollars in thousands)		2014			2013
	Old National Bancorp:
	Senior unsecured bank notes (fixed rate 4.125%) maturing August 2024		$	175,000		$	—
	Junior subordinated debentures (variable rates 1.58% to 1.99%) maturing March 2035 to June 2037			45,000			28,000
	ASC 815 fair value hedge and other basis adjustments			(4,884	)		(3,262	)
	Old National Bank:
	Securities sold under agreements to repurchase (fixed rates 2.47% to 2.50%) maturing January 2017 to January 2018			50,000			50,000
	Federal Home Loan Bank advances (fixed rates 0.19% to 6.76% and variable rates 0.31% to 0.34%) maturing January 2015 to May 2024			649,987			477,856
	Capital lease obligation			4,099			4,157
	ASC 815 fair value hedge and other basis adjustments			900			(363	)

	Total other borrowings		$	920,102		$	556,388




	Contractual maturities of other borrowings at December 31, 2014, were as follows:



	(dollars in thousands)
	Due in 2015		$	200,063
	Due in 2016			117,376
	Due in 2017			45,909
	Due in 2018			195,516
	Due in 2019			3,307
	Thereafter			361,915
	ASC 815 fair value hedge and other basis adjustments			(3,984	)

	Total		$	920,102


	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 15th and August 15th, with payment commencing February 15, 2015. The notes mature on August 15, 2024.

	FEDERAL HOME LOAN BANK

	FHLB advances had weighted-average rates of 0.77% and 0.94% at December 31, 2014 and 2013, respectively. These borrowings are collateralized by investment securities and residential real estate loans up to 149% of outstanding debt.

	During 2013, Old National terminated $50.0 million of FHLB advances, resulting in a loss on extinguishment of debt of $1.0 million. Old National also restructured $33.4 million pertaining to two FHLB advances in the first quarter of 2013, which lowered their effective interest rates from 3.27% and 3.29% to 2.04% and 2.49%, respectively.

	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 had a cumulative annual distribution rate of 6.27% until March 2010 and now carry a variable rate of interest priced at the three-month 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. Old National, at any time, may redeem the junior subordinated debentures at par and thereby cause a redemption of the trust preferred securities.

	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 carried a fixed rate of interest of 7.15% until October 7, 2011 and thereafter 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 carried a fixed rate of interest of 6.52% until June 15, 2012 and thereafter 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. 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.



	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. 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.

	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.

At December 31, 2014, the future minimum lease payments under the capital lease were as follows:



(dollars in thousands)
2015		$	410
2016			410
2017			410
2018			410
2019			429
Thereafter			8,836

Total minimum lease payments			10,905
Less amounts representing interest			6,806

Present value of net minimum lease payments		$	4,099

Income_Taxes

Income Taxes	12 Months Ended
Income Taxes	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes	NOTE 14 – 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)		2014				2013				2012
	Provision at statutory rate of 35%		$	49,688			$	49,881			$	44,725
	Tax-exempt income:
	Tax-exempt interest			(11,460	)			(10,125	)			(8,590	)
	Section 291/265 interest disallowance			93				107				147
	Bank owned life insurance income			(2,423	)			(2,609	)			(2,258	)

	Tax-exempt income			(13,790	)			(12,627	)			(10,701	)

	Reserve for unrecognized tax benefits			(1,076	)			(381	)			(292	)
	State income taxes			2,676				3,386				3,409
	State statutory rate change			904				1,257				—
	Other, net			(105	)			81				(1,031	)

	Income tax expense		$	38,297			$	41,597			$	36,110

	Effective tax rate			27	%			29.2	%			28.3	%

	The effective tax rate decreased in 2014 as a result of higher tax-exempt income in relation to pre-tax book income as compared to prior years, as well as lower state taxes due to reduced statutory rates. The effective tax rate increased from 2012 to 2013 as a result of increases in pre-tax income. In 2014, there was income tax expense of $0.9 million related to a statutory rate change during the first quarter. In 2013, there was income tax expense of $1.3 million related to a statutory rate change during the second quarter.

	The provision for income taxes consisted of the following components for the years ended December 31:



	(dollars in thousands)		2014				2013				2012
	Income taxes currently payable:
	Federal		$	8,974			$	13,901			$	21,015
	State			581				(51	)			1,975
	Deferred income taxes related to:
	Federal			27,207				22,983				11,052
	State			1,535				4,764				2,068

	Deferred income tax expense			28,742				27,747				13,120

	Provision for income taxes		$	38,297			$	41,597			$	36,110




	Significant components of net deferred tax assets (liabilities) were as follows at December 31:



	(dollars in thousands)		2014				2013
	Deferred Tax Assets
	Allowance for loan losses, net of recapture		$	16,348			$	16,891
	Benefit plan accruals			16,683				15,331
	AMT credit			19,808				21,268
	Unrealized losses on benefit plans			5,648				4,011
	Net operating loss carryforwards			3,258				3,763
	Premises and equipment			20,139				24,221
	Federal tax credits			1,632				422
	Other-than-temporary-impairment			3,573				4,939
	Acquired loans			49,350				51,546
	Lease exit obligation			1,747				2,654
	Unrealized losses on available-for-sale investment securities			1,815				13,276
	Unrealized losses on held-to-maturity investment securities			8,120				8,567
	Unrealized losses on hedges			3,638				116
Other, net			6,324				5,406

Total deferred tax assets			158,083				172,411

Deferred Tax Liabilities
Accretion on investment securities			(449	)			(438	)
Lease receivable, net			—				(395	)
Other real estate owned			(178	)			(701	)
Purchase accounting			(15,112	)			(7,355	)
FDIC indemnification asset			(6,909	)			(27,938	)
Loan servicing rights			(3,558	)			—
Other, net			(2,530	)			(2,028	)

Total deferred tax liabilities			(28,736	)			(38,855	)

Net deferred tax assets		$	129,347			$	133,556


The net deferred tax assets are included with other assets on the balance sheet. No valuation allowance was recorded at December 31, 2014 or 2013 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 at December 31, 2014 and 2013 of $4.0 million and $6.6 million, respectively. This federal net operating loss was acquired from the acquisition of IBT in 2012. If not used, the federal net operating loss carryforwards will begin to expire in 2032. Old National has alternative minimum tax credit carryforwards at December 31, 2014 and 2013 of $19.8 million and $21.3 million, respectively. The alternative minimum tax credit carryforward does not expire. Old National has federal tax credit carryforwards of $1.6 million and $0.4 million for the years ended December 31, 2014 and 2013, respectively. The federal tax credits consist mainly of new market tax credits and low income housing credits that, if not used, will begin to expire in 2030. Old National has state net operating loss carryforwards totaling $53.5 million and $32.3 million at December 31, 2014 and 2013, respectively. If not used, the state net operating loss carryforwards will begin to expire in 2022.

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 is as follows:



(dollars in thousands)		2014				2013				2012
Balance at January 1		$	3,847			$	3,953			$	4,145
Additions based on tax positions related to the current year			37				34				2
Reductions due to statute of limitations expiring			(3,807	)			(140	)			(194	)

Balance at December 31		$	77			$	3,847			$	3,953


Approximately $80 thousand of unrecognized tax benefits, net of interest, if recognized, would favorably affect the effective income tax rate in future periods.

The Company reversed $3.8 million in 2014 related to uncertain tax positions accounted for under FASB ASC 740-10 (FASB Interpretation No. 48, Accounting for Uncertainty in Income Taxes). The positive $3.8 million income tax reversal relates to the 2010 statute of limitations expiring. The statute of limitations expired in the third quarter of 2014. As a result, the Company reversed a total of $3.8 million from its unrecognized tax benefit liability.

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 for the years ended December 31, 2014, 2013 and 2012 of $(1.1) million, $(0.2) million and $(0.1) million, respectively. The amount accrued for interest and penalties in the balance sheet at December 31, 2014 and 2013 was $10 thousand and $1.1 million, respectively.

Old National and its subsidiaries file a consolidated U.S. federal income tax return, as well as filing various state returns. The 2011 through 2014 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 still in process at December 31, 2014. The Company believes that their tax return was filed based on applicable statutes, regulations and case law in effect at the time.

In the third quarter of 2013, we reversed $0.4 million, including interest of $0.2 million not included in the table above, related to uncertain tax positions accounted for under FASB ASC 740-10 (FASB Interpretation No. 48, Accounting for Uncertainty in Income Taxes) (“ASC Topic 740-10”). The positive $0.4 million income tax reversal relates to the 2009 statute of limitations expiring. The statute of limitations expired in the third quarter of 2013. As a result, we reversed a total of $0.4 million from its unrecognized tax benefit liability which includes $0.2 million of interest.

In the third quarter of 2012, we reversed $0.3 million, including interest of $0.1 million not included in the table above, related to uncertain tax positions accounted for under ASC Topic 740-10. The positive $0.3 million income tax reversal relates to the 2008 statute of limitations expiring. The statute of limitations expired in the third quarter of 2012. As a result, we reversed a total of $0.3 million from its unrecognized tax benefit liability which includes $0.1 million of interest.

Employee_Benefit_Plans

Employee Benefit Plans	12 Months Ended
Employee Benefit Plans	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Employee Benefit Plans	NOTE 15 – EMPLOYEE BENEFIT PLANS

	RETIREMENT PLAN AND RESTORATION PLAN

	Old National maintains a funded noncontributory defined benefit plan (the “Retirement Plan”) that was frozen as of December 31, 2005. Retirement benefits are based on years of service and compensation during the highest paid five years of employment. The freezing of the plan provides that future salary increases will not be considered. Old National’s policy is to contribute at least the minimum funding requirement determined by the plan’s actuary.

	Old National also 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.



	Old National uses a December 31 measurement date for its defined benefit pension plans. The following table presents the combined activity of our defined benefit plans:



	EMPLOYEE BENEFIT PLANS
	(dollars in thousands)		2014				2013
	Change in Projected Benefit Obligation
	Balance at January 1		$	41,321			$	48,728
	Interest cost			1,754				1,740
	Benefits paid			(931	)			(942	)
	Actuarial loss (gain)			6,287				(3,783	)
	Settlement			(1,985	)			(4,422	)

	Projected Benefit Obligation at December 31			46,446				41,321

	Change in Plan Assets
	Fair value at January 1			37,916				37,550
	Actual return on plan assets			2,260				5,320
	Employer contributions			433				410
	Benefits paid			(931	)			(942	)
	Settlement			(1,985	)			(4,422	)

	Fair value of Plan Assets at December 31			37,693				37,916

	Funded status at December 31			(8,753	)			(3,405	)

	Amounts recognized in the statement of financial position at December 31:
	Accrued benefit liability		$	(8,753	)		$	(3,405	)

	Net amount recognized		$	(8,753	)		$	(3,405	)

	Amounts recognized in accumulated other comprehensive income at December 31:
	Net actuarial loss		$	14,863			$	10,530

	Total		$	14,863			$	10,530


	The estimated net loss for the defined benefit pension plans that will be amortized from accumulated other comprehensive income into net periodic benefit cost over the next fiscal year is $2.1 million.

	The accumulated benefit obligation and the projected benefit obligation were equivalent for the defined benefit pension plans and were $46.4 million and $41.3 million at December 31, 2014 and 2013, respectively.



	The net periodic benefit cost and its components were as follows for the years ended December 31:



	(dollars in thousands)		2014				2013				2012
	Net Periodic Benefit Cost
	Interest cost		$	1,754			$	1,740			$	1,971
	Expected return on plan assets			(2,239	)			(2,202	)			(2,345	)
	Recognized actuarial loss			1,316				2,318				4,027

	Net periodic benefit cost		$	831			$	1,856			$	3,653
Settlement cost			617				1,118				1,170

Total net periodic benefit cost		$	1,448			$	2,974			$	4,823

Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income
Net actuarial (gain)/loss		$	6,266			$	(6,901	)		$	1,903
Amortization of net actuarial loss			(1,316	)			(2,318	)			(4,027	)
Settlement cost			(617	)			(1,118	)			(1,170	)

Total recognized in other comprehensive income		$	4,333			$	(10,337	)		$	(3,294	)

Total recognized in net periodic benefit cost and other comprehensive income		$	5,781			$	(7,363	)		$	1,529


The weighted-average assumptions used to determine the benefit obligations 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 plans are frozen, increases in compensation are not considered.



		2014				2013				2012
Benefit obligations:
Discount rate at the end of the period			4	%			4.75	%			4	%
Net periodic benefit cost:
Discount rate at the beginning of the period			4.75	%			4	%			4.55	%
Expected return on plan assets			7.5				7.5				7.5
Rate of compensation increase			N/A				N/A				N/A

The expected long-term rate of return for each asset class was developed by combining a long-term inflation component, the risk-free real rate of return and the associated risk premium. A weighted average rate was developed based on those overall rates and the target asset allocation of the plan. 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, 2014.

Old National’s asset allocation of the Retirement Plan as of year-end is presented in the following table. Old National’s Restoration Plan is unfunded.



Asset Category		Expected				2014 Target				2014				2013			2012
		Long-Term				Allocation
		Rate of Return
Equity securities			9.00% – 9.50	%			40 – 70	%			61	%			64	%		61	%
Debt securities			4.00% – 5.85	%			30 – 60	%			38				35			38
Cash equivalents			—				0 – 15	%			1				1			1

Total											100	%			100	%		100	%


Our overall investment strategy is to achieve a mix of approximately 40% to 70% of equity securities, 30% to 60% of debt securities and 0% to 15% of cash equivalents. Fixed income securities and cash equivalents must meet minimum rating standards. Exposure to any particular company or industry is also limited. The investment policy is reviewed annually. There was no Old National stock in the plan as of December 31, 2014, 2013 or 2012.



The fair value of our plan assets are determined based on observable Level 1 or 2 pricing inputs, including quoted prices for similar assets in active or non-active markets. The holdings of the plan are comprised of pooled separate accounts, except for one mutual fund in the Fixed Income category. As of December 31, 2014, the fair value of plan assets, by asset category, is as follows:



						Fair Value Measurements at December 31, 2014 Using
(dollars in thousands)		Carrying				Quoted Prices in				Significant				Significant
		Value				Active Markets for				Other				Unobservable
						Identical Assets				Observable				Inputs
						(Level 1)				Inputs				(Level 3)
										(Level 2)
Plan Assets
Large U.S. Equity		$	15,877			$	—			$	15,877			$	—
International Equity			7,103				—				7,103				—
Short-Term Fixed Income			468				—				468				—
Fixed Income			14,245				14,245				—				—

Total Plan Assets		$	37,693			$	14,245			$	23,448			$	—


As of December 31, 2013, the fair value of plan assets, by asset category, was as follows:



						Fair Value Measurements at December 31, 2013 Using
(dollars in thousands)		Carrying				Quoted Prices in				Significant				Significant
		Value				Active Markets for				Other				Unobservable
						Identical Assets				Observable				Inputs
						(Level 1)				Inputs				(Level 3)
										(Level 2)
Plan Assets
Large U.S. Equity		$	16,245			$	—			$	16,245			$	—
International Equity			8,120				—				8,120				—
Short-Term Fixed Income			102				—				102				—
Fixed Income			13,449				13,449				—				—

Total Plan Assets		$	37,916			$	13,449			$	24,467			$	—


As of December 31, 2014, expected future benefit payments related to Old National’s defined benefit plans were as follows:



(dollars in thousands)
2015		$	9,830
2016			4,390
2017			5,060
2018			3,060
2019			3,760
Years 2020 – 2024			14,330

Old National expects to contribute cash of $0.7 million to the pension plans in 2015.

On September 15, 2012, Old National assumed Indiana Bank and Trust’s Pentegra Defined Benefit Plan for Financial Institutions. This defined benefit pension plan has been frozen since April 1, 2008. The trustees of the Financial Institutions Retirement Fund administer the Pentegra Plan, employer identification number 13-5645888 and plan number 333. The Pentegra Plan operates as a multi-employer plan for accounting purposes and as a multiple-employer plan under the Employee Retirement Income Security Act of 1974 and the Internal Revenue Code.



During the second quarter of 2013, Old National withdrew from the plan, contributing $14.0 million to satisfy the final termination liability. Funding the termination liability had no impact on earnings as it was considered in the fair value of Indiana Bank and Trust’s purchase accounting entries.

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 2014, 2013 and 2012, 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 2014, 2013 or 2012. All contributions vest immediately and plan participants may elect to redirect funds among any of the investment options provided under the 401(k) plan. During the years ended December 31, 2014, 2013 and 2012, the number of Old National shares allocated to the 401(k) plan were 1.2 million, 1.3 million and 1.4 million, respectively. 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 $4.3 million in 2014, $3.8 million in 2013 and $3.4 million in 2012.

StockBased_Compensation

Stock-Based Compensation	12 Months Ended
Stock-Based Compensation	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	NOTE 16 – STOCK-BASED COMPENSATION

	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, 2014, 5.2 million shares were available for issuance. Since 2010, the granting of awards to key employees is typically in the form of restricted stock. 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 $4.2 million in 2014, $4.0 million in 2013 and $3.3 million in 2012. The total income tax benefit was $1.6 million in 2014, $1.6 million in 2013 and $1.3 million in 2012.

	Restricted Stock Awards

	Restricted stock awards require certain service-based or performance requirements and commonly have vesting periods of 3 to 5 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)		Number				Weighted Average
			Outstanding				Grant-Date
							Fair Value
	Nonvested balance at January 1, 2014			172			$	12.44
	Granted during the year			196				14.15
	Vested during the year			(90	)			12.13
	Forfeited during the year			(2	)			13.96

	Nonvested balance at December 31, 2014			276			$	13.74


	As of December 31, 2014, there was $2.5 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 2.1 years. The total fair value of the shares vested during the years ended December 31, 2014, 2013 and 2012 was $1.3 million, $1.4 million and $1.9 million, respectively. Included in 2012 is the reversal of $0.4 million of expense associated with certain performance based restricted stock grants.



	In connection with the acquisition of IBT on September 15, 2012, 15,000 unvested IBT restricted stock awards were converted to 29,000 unvested Old National restricted stock awards. These restricted stock awards vested December 31, 2012 upon the retirement of the participant with the remaining expense of $23,000 accelerated into the fourth quarter.

	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)		Number				Weighted Average
			Outstanding				Grant-Date
							Fair Value
	Nonvested balance at January 1, 2014			711			$	11.87
	Granted during the year			260				12.46
	Vested during the year			(174	)			12.21
	Forfeited during the year			—				—
	Reinvested dividend equivalents			22				12.28

	Nonvested balance at December 31, 2014			819			$	12.02


	As of December 31, 2014, there was $2.9 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. Included in 2014 is a net decrease to expense of $0.3 million related to our future vesting expectations of certain performance based restricted stock grants. Included in 2013 is a net decrease to expense of $0.2 million related to our future vesting expectations of certain performance based restricted stock grants. Included in 2012 is a net increase to expense of $0.2 million related to our future vesting expectations of certain performance based restricted stock grants.

	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 contractual terms.

	Old National has not granted stock options since 2009. However, in connection with the acquisition of Tower Financial Corporation on April 25, 2014, 22 thousand options for shares of Tower Financial Corporation were converted to 37 thousand options for shares of Old National Bancorp stock. In connection with the acquisition of United Bancorp, Inc. on July 31, 2014, 0.3 million options for shares of United Bancorp, Inc. were converted to 0.2 million options for shares of Old National Bancorp stock. In connection with the acquisition of IBT on September 15, 2012, 0.2 million options for shares of IBT stock were converted to 0.3 million options for shares of Old National stock. Old National recorded no incremental expense associated with the conversion of these options.



	A summary of the activity in the stock option plan for 2014 follows:



(shares in thousands)		Shares				Weighted			Weighted		Aggregate
						Average			Average		Intrinsic
						Exercise			Remaining		Value
						Price			Contractual		(in thousands)
									Term in Years
Outstanding, January 1			1,344			$	16.96
Granted			—				—
Acquired			431				14.84
Exercised			(105	)			10.17
Forfeited/expired			(208	)			20.61

Outstanding, December 31			1,462			$	16.3			2.67	$	2,509.40

Options exercisable at end of year			1,462			$	16.3			2.67	$	2,506.40

Information related to the stock option plan during each year follows:



(dollars in thousands)		2014				2013			2012
Intrinsic value of options exercised		$	432			$	282		$	256
Cash received from option exercises			1,002				1,159			716
Tax benefit realized from option exercises			97				45			72

As of December 31, 2014, all options were fully vested and all compensation costs had been expensed.

Stock Appreciation Rights

Old National has never granted stock appreciation rights. However, in connection with the acquisition of United Bancorp, Inc. on July 31, 2014, 0.2 million stock appreciation rights for shares of United Bancorp, Inc. were converted to 0.2 million stock appreciation rights for shares of Old National Bancorp stock. Old National recorded no incremental expense associated with the conversion of these stock appreciation rights.

Outside_Director_Stock_Compens

Outside Director Stock Compensation Program	12 Months Ended
Outside Director Stock Compensation Program	Dec. 31, 2014
Text Block [Abstract]
Outside Director Stock Compensation Program	NOTE 17 – OUTSIDE DIRECTOR STOCK COMPENSATION PROGRAM
Outside Director Stock Compensation Program	Old National maintains a director stock compensation program covering all outside directors. Compensation shares are earned semi-annually. A maximum of 165,375 shares of common stock is available for issuance under this program. As of December 31, 2014, Old National had issued 118,678 shares under this program.

Shareholders_Equity

Shareholders' Equity	12 Months Ended
Shareholders' Equity	Dec. 31, 2014
Equity [Abstract]
Shareholders' Equity	NOTE 18 – 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. No shares were issued related to these plans in 2014, 2013 or 2012. As of December 31, 2014, 3.3 million authorized and unissued common shares were reserved for issuance under these plans.
	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 2014, 24,000 shares were issued related to this plan with proceeds of approximately $326,000. In 2013, 22,000 shares were issued related to this plan with proceeds of approximately $290,000.

Fair_Value

Fair Value	12 Months Ended
Fair Value	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair Value	NOTE 19 – FAIR VALUE

	FASB ASC 820-10 defines fair value as the exchange price that would be received for an asset or paid to transfer a liability (exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. FASB ASC 820-10 also establishes a fair value hierarchy, which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The standard describes three levels of inputs that may be used to measure fair values:


		•		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: The fair values for investment securities are determined by quoted market prices, if available (Level 1). For securities where quoted prices are not available, fair values are calculated based on market prices of similar securities (Level 2). For securities where quoted prices or market prices of similar securities are not available, fair values are calculated using discounted cash flows or other market indicators (Level 3). Discounted cash flows are calculated using swap and LIBOR curves plus spreads that adjust for loss severities, volatility, credit risk and optionality. During times when trading is more liquid, broker quotes are used (if available) to validate the model. Rating agency and industry research reports as well as defaults and deferrals on individual securities are reviewed and incorporated into the calculations.

	Residential loans held for sale: The fair value of loans held for sale is determined using quoted prices for a similar asset, adjusted for specific attributes of that loan (Level 2).

	Derivative financial instruments: The fair values of derivative financial instruments are based on derivative valuation models using market data inputs as of the valuation date (Level 2).



	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, 2014 Using
	(dollars in thousands)		Carrying			Quoted Prices in			Significant			Significant
			Value			Active Markets for			Other			Unobservable
						Identical Assets			Observable			Inputs
						(Level 1)			Inputs			(Level 3)
									(Level 2)
	Financial Assets
	Trading securities		$	3,881		$	3,881		$	—		$	—
	Investment securities available-for-sale:
	U.S. Treasury			15,166			15,166			—			—
	U.S. Government-sponsored entities and agencies			685,951			—			685,951			—
	Mortgage-backed securities – Agency			1,241,662			—			1,241,662			—
	States and political subdivisions			314,541			—			314,216			325
	Pooled trust preferred securities			6,607			—			—			6,607
	Other securities			393,745			31,648			362,097			—
	Residential loans held for sale			15,562			—			15,562			—
	Derivative assets			18,572			—			18,572			—
	Financial Liabilities
	Derivative liabilities			23,868			—			23,868			—



						Fair Value Measurements at December 31, 2013 Using
	(dollars in thousands)		Carrying			Quoted Prices in			Significant			Significant
			Value			Active Markets for			Other			Unobservable
						Identical Assets			Observable			Inputs
						(Level 1)			Inputs			(Level 3)
									(Level 2)
	Financial Assets
	Trading securities		$	3,566		$	3,566		$	—		$	—
	Investment securities available-for-sale:
	U.S. Treasury			13,113			13,113			—			—
	U.S. Government-sponsored entities and agencies			435,588			—			435,588			—
	Mortgage-backed securities – Agency			1,289,258			—			1,289,258			—
	Mortgage-backed securities – Non-agency			17,412			—			17,412			—
	States and political subdivisions			268,795			—			268,126			669
	Pooled trust preferred securities			8,037			—			—			8,037
Other securities			339,998			31,254			308,744			—
Residential loans held for sale			7,705			—			7,705			—
Derivative assets			22,087			—			22,087			—
Financial Liabilities
Derivative liabilities			19,723			—			19,723			—



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, 2014:



		Fair Value Measurements using
		Significant Unobservable Inputs
		(Level 3)
(dollars in thousands)		Pooled Trust Preferred			State and
		Securities Available-			Political
		for-Sale			Subdivisions
Beginning balance, January 1, 2014		$	8,037		$	669
Accretion/(amortization) of discount or premium			18			2
Sales/payments received			(1,118	)		(11	)
Matured securities			—			(335	)
Increase/(decrease) in fair value of securities			(330	)		—

Ending balance, December 31, 2014		$	6,607		$	325


Included in the income statement is $20 thousand of income included in interest income from the accretion of discounts on securities. The decrease in fair value is reflected in the balance sheet as a decrease in the fair value of investment securities available-for sale, a decrease in accumulated other comprehensive income, which is included in shareholders’ equity, and an increase in other assets related to the tax impact.

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, 2013:



		Fair Value Measurements using
		Significant Unobservable Inputs
		(Level 3)
(dollars in thousands)		Pooled Trust Preferred			State and
		Securities Available-			Political
		for-Sale			Subdivisions
Beginning balance, January 1, 2013		$	9,359		$	984
Accretion/(amortization) of discount or premium			17			5
Sales/payments received			(2,929	)		—
Matured securities			—			(320	)
Credit loss write-downs			(1,000	)		—
Increase/(decrease) in fair value of securities			2,590			—

Ending balance, December 31, 2013		$	8,037		$	669


Included in the income statement is $22 thousand of income included in interest income from the accretion of discounts on securities and $1.0 million of credit losses included in noninterest 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, an increase in accumulated other comprehensive income, which is included in shareholders’ equity, and a decrease in other assets related to the tax impact.



The tables below provide quantitative information about significant unobservable inputs used in fair value measurements within Level 3 of the fair value hierarchy:



		Quantitative Information about Level 3 Fair Value Measurements
(dollars in thousands)		Fair Value at			Valuation		Unobservable	Range (Weighted
		Dec. 31, 2014						Average)
					Techniques		Input
Pooled trust preferred securities		$	6,607		Discounted cash flow		Constant prepayment rate (a)	0.00%
							Additional asset defaults (b)	4.4% – 11.2% (8.2%)
							Expected asset recoveries (c)	0.7% – 7.0% (1.8%)

State and political subdivision securities			325		Discounted cash flow		No unobservable inputs	N/A
							Illiquid local municipality issuance
							Old National owns 100%
							Carried at par


(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%.



		Quantitative Information about Level 3 Fair Value Measurements
(dollars in thousands)		Fair Value at			Valuation		Unobservable	Range (Weighted
		Dec. 31, 2013						Average)
					Techniques		Input
Pooled trust preferred securities		$	8,037		Discounted cash flow		Constant prepayment rate (a)	0.00%
							Additional asset defaults (b)	1.9% – 9.6% (4.5%)
							Expected asset recoveries (c)	1.7% – 9.6% (3.2%)

State and political subdivision securities			669		Discounted cash flow		No unobservable inputs	N/A
							Illiquid local municipality issuance
							Old National owns 100%
							Carried at par


(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 significant unobservable inputs used in the fair value measurement for pooled trust preferred securities are prepayment rates, assumed additional pool asset defaults and expected return to performing status of defaulted pool assets. Significant changes in any of the inputs in isolation would result in a significant change to the fair value measurement. The three pooled trust preferred securities Old National owned at December 31, 2014 were 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 basis are summarized below:



					Fair Value Measurements at December 31, 2014 Using
(dollars in thousands)		Carrying			Quoted Prices in			Significant			Significant
		Value			Active Markets for			Other			Unobservable
					Identical Assets			Observable			Inputs
					(Level 1)			Inputs			(Level 3)
								(Level 2)
Collateral Dependent Impaired Loans
Commercial loans		$	6,816		$	—		$	—		$	6,816
Commercial real estate loans			13,011			—			—			13,011
Foreclosed Assets
Commercial real estate			6,146			—			—			6,146
Residential			254			—			—			254

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 $30.0 million, with a valuation allowance of $10.2 million at December 31, 2014. Old National recorded $5.4 million of provision expense associated with these loans in 2014.

Other real estate owned and other repossessed property is measured at fair value less costs to sell and had a net carrying amount of $6.4 million at December 31, 2014. 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 $2.6 million in 2014.



					Fair Value Measurements at December 31, 2013 Using
(dollars in thousands)		Carrying			Quoted Prices in			Significant			Significant
		Value			Active Markets for			Other			Unobservable
					Identical Assets			Observable			Inputs
					(Level 1)			Inputs			(Level 3)
								(Level 2)
Collateral Dependent Impaired Loans
Commercial loans		$	9,224		$	—		$	—		$	9,224
Commercial real estate loans			7,851			—			—			7,851
Foreclosed Assets
Commercial real estate			9,069			—			—			9,069
Residential			283			—			—			283

As of December 31, 2013, impaired commercial and commercial real estate loans had a principal amount of $25.4 million, with a valuation allowance of $8.3 million at December 31, 2013. Old National recorded $6.9 million of provision expense associated with these loans in 2013.

Other real estate owned and other repossessed property is measured at fair value less costs to sell and had a net carrying amount of $9.4 million at December 31, 2013. There were write-downs of other real estate owned of $3.5 million in 2013.



The tables below provide quantitative information about significant unobservable inputs used in fair value measurements within Level 3 of the fair value hierarchy:



		Quantitative Information about Level 3 Fair Value Measurements
(dollars in thousands)		Fair Value at			Valuation		Unobservable	Range (Weighted
		Dec. 31, 2014			Techniques			Average)
							Input
Collateral Dependent Impaired Loans
Commercial loans		$	6,816		Fair value of collateral		Discount for type of property, age of appraisal and current status	0% - 94% (24%)

Commercial real estate loans			13,011		Fair value of collateral		Discount for type of property, age of appraisal and current status	0% - 50% (29%)

Foreclosed Assets
Commercial real estate			6,146		Fair value of collateral		Discount for type of property, age of appraisal and current status	2% - 93% (30%)

Residential			254		Fair value of collateral		Discount for type of property, age of appraisal and current status	8% - 81% (45%)

		Quantitative Information about Level 3 Fair Value Measurements
(dollars in thousands)		Fair Value at			Valuation		Unobservable	Range (Weighted
		Dec. 31, 2013			Techniques			Average)
							Input
Collateral Dependent Impaired Loans
Commercial loans		$	9,224		Fair value of collateral		Discount for type of property, age of appraisal and current status	0% - 75% (24%)

Commercial real estate loans			7,851		Fair value of collateral		Discount for type of property, age of appraisal and current status	10% - 54% (30%)

Foreclosed Assets
Commercial real estate			9,069		Fair value of collateral		Discount for type of property, age of appraisal and current status	10% - 40% (25%)

Residential			283		Fair value of collateral		Discount for type of property, age of appraisal and current status	10% - 45% (25%)

Collateral dependent loans, other real estate owned and other repossessed property are valued 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 appraisals are discounted depending on the type of property and the type of appraisal (market value vs. liquidation value).

Financial instruments recorded using fair value option

Under FASB ASC 825-10, we may elect to report most financial instruments and certain other items at fair value on an instrument-by instrument basis with changes in fair value reported in net income. After the initial adoption, the election is made at the acquisition of an eligible financial asset, financial liability or firm commitment or when certain specified reconsideration events occur. The fair value election may not be revoked once an election is made.



We have elected the fair value option for 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 $381 thousand and $365 thousand of interest income for loans held for sale for the years ended December 31, 2014 and 2013, respectively.

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.

As of December 31, 2014, the difference between the aggregate fair value and the aggregate remaining principal balance for loans for which the fair value option has been elected is as follows:



(dollars in thousands)		Aggregate			Difference			Contractual
(dollars in thousands)		Fair Value			Difference			Principal
Residential loans held for sale		$	15,562		$	375		$	15,187

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 year ended December 31, 2014:



Changes in Fair Value for the Year ended December 31, 2014, for Items

Measured at Fair Value Pursuant to Election of the Fair Value Option
(dollars in thousands)		Other			Interest			Interest			Total Changes
		Gains and			Income			(Expense)			in Fair Values
		(Losses)									Included in
											Current Period
											Earnings
Residential loans held for sale		$	247		$	—		$	—		$	247

As of December 31, 2013, the difference between the aggregate fair value and the aggregate remaining principal balance for loans for which the fair value option has been elected was as follows:



(dollars in thousands)		Aggregate			Difference			Contractual
(dollars in thousands)		Fair Value			Difference			Principal
Residential loans held for sale		$	7,705		$	128		$	7,577

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 year ended December 31, 2013:



Changes in Fair Value for the Year ended December 31, 2013, for Items

Measured at Fair Value Pursuant to Election of the Fair Value Option
(dollars in thousands)		Other			Interest			Interest			Total Changes
		Gains and			Income			(Expense)			in Fair Values
		(Losses)									Included in
											Current Period
											Earnings
Residential loans held for sale		$	(224	)	$	—		$	(2	)	$	(226	)



The carrying amounts and estimated fair values of financial instruments, not previously presented in this note, at December 31, 2014 and 2013, respectively, are as follows:



					Fair Value Measurements at December 31, 2014 Using
(dollars in thousands)		Carrying			Quoted Prices in			Significant			Significant
		Value			Active Markets for			Other			Unobservable
					Identical Assets			Observable			Inputs
					(Level 1)			Inputs			(Level 3)
								(Level 2)
Financial Assets
Cash, due from banks, federal funds sold and money market investments		$	239,963		$	239,963		$	—		$	—
Investment securities held-to-maturity:
U.S. Government-sponsored entities and agencies			167,207			—			173,486			—
Mortgage-backed securities – Agency			23,648			—			24,574			—
State and political subdivisions			653,199			—			705,875			—
Federal Home Loan Bank stock			41,334			—			41,334			—
Loans held for sale (a)			197,928			—			197,928			—
Loans, net (including covered loans):
Commercial			1,626,097			—			—			1,646,144
Commercial real estate			1,734,559			—			—			1,744,126
Residential real estate			1,537,448			—			—			1,615,588
Consumer credit			1,372,248			—			—			1,380,835
FDIC indemnification asset			20,603			—			—			11,358
Accrued interest receivable			60,966			29			21,633			39,304
Loan servicing rights			9,534			—			9,534			—

Financial Liabilities
Deposits:
Noninterest-bearing demand deposits		$	2,427,748		$	2,427,748		$	—		$	—
NOW, savings and money market deposits			4,973,898			4,973,898			—			—
Time deposits			1,089,018			—			1,092,969			—
Short-term borrowings:
Federal funds purchased			195,188			195,188			—			—
Repurchase agreements			356,121			356,120			—			—
Other borrowings:
Senior unsecured bank notes			175,000			—			179,792			—
Junior subordinated debentures			45,000			—			32,754			—
Repurchase agreements			50,000			—			51,994			—
Federal Home Loan Bank advances			649,987			—						658,506
Capital lease obligation			4,099			—			5,515			—
Accrued interest payable			4,564			—			4,564			—
Standby letters of credit			358			—			—			358

Off-Balance Sheet Financial Instruments
Commitments to extend credit		$	—		$	—		$	—		$	2,030


(a)	Includes loans held for sale associated with branch sales. Excludes $15.6 million of residential loans held for sale measured at fair value on a recurring basis.



					Fair Value Measurements at December 31, 2013 Using
(dollars in thousands)		Carrying			Quoted Prices in			Significant			Significant
		Value			Active Markets for			Other			Unobservable
					Identical Assets			Observable			Inputs
					(Level 1)			Inputs			(Level 3)
								(Level 2)
Financial Assets
Cash, due from banks, federal funds sold and money market investments		$	206,723		$	206,723		$	—		$	—
Investment securities held-to-maturity:
U.S. Government-sponsored entities and agencies			170,621			—			178,370			—
Mortgage-backed securities – Agency			35,443			—			36,348			—
State and political subdivisions			556,670			—			566,040			—
Federal Home Loan Bank stock			40,584			—			40,584			—
Loans, net (including covered loans):
Commercial			1,386,185			—			—			1,414,184
Commercial real estate			1,220,417			—			—			1,273,070
Residential real estate			1,384,183			—			—			1,475,710
Consumer credit			1,045,034			—			—			1,058,021
FDIC indemnification asset			88,513			—			—			55,368
Accrued interest receivable			50,205			42			20,708			29,455

Financial Liabilities
Deposits:
Noninterest-bearing demand deposits		$	2,026,490		$	2,026,490		$	—		$	—
NOW, savings and money market deposits			4,166,438			4,166,438			—			—
Time deposits			1,017,975			—			1,028,043			—
Short-term borrowings:
Federal funds purchased			115,103			115,103			—			—
Repurchase agreements			347,229			347,226			—			—
Other borrowings:
Junior subordinated debentures			28,000			—			17,605			—
Repurchase agreements			50,000			—			52,633			—
Federal Home Loan Bank advances			447,856			—			—			485,759
Capital lease obligation			4,157			—			5,245			—
Accrued interest payable			1,877			—			1,877			—
Standby letters of credit			380			—			—			380

Off-Balance Sheet Financial Instruments
Commitments to extend credit		$	—		$	—		$	—		$	1,648

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 resell agreements and money market investments: For these instruments, the carrying amounts approximate fair value (Level 1).

Investment securities: Fair values for investment securities held-to-maturity are based on quoted market prices, if available. For securities where quoted prices are not available, fair values are estimated based on market prices of similar securities (Level 2).

Federal Home Loan Bank Stock: Old National Bank 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 and periodically evaluated for impairment based on ultimate recovery of par value. The carrying value of FHLB stock approximates fair value based on the redemption provisions of the FHLB (Level 2).

Loans held for sale: The fair value of loans held for sale is estimated based on binding contracts from third party investors (Level 2).

Loans: The fair value of loans is estimated by discounting future cash flows using current rates at which similar loans would be made to borrowers with similar credit ratings and for the same remaining maturities (Level 3).

Covered loans: Fair values for loans were based on a discounted cash flow methodology that considered factors including the type of loan and related collateral, classification status, fixed or variable interest rate, term of loan and whether or not the loan was amortizing, and a discount rate reflecting current market rates for new originations of comparable loans adjusted for the risk inherent in the cash flow estimates. Loans were grouped together according to similar characteristics and were treated in the aggregate when applying various valuation techniques (Level 3).

FDIC indemnification asset: The loss sharing asset was measured separately from the related covered assets as it is not contractually embedded in the assets and is not transferable with the assets should we choose to dispose of the assets. Fair value was originally estimated using projected cash flows related to the loss sharing agreement based on the expected reimbursements for losses and the applicable loss sharing percentage and these projected cash flows are updated with the cash flow estimates on covered assets. These cash flows were discounted to reflect the uncertainty of the timing and receipt of the loss sharing reimbursement from the FDIC (Level 3).

Accrued interest receivable and payable: The carrying amount approximates fair value and is aligned with the underlying assets or liabilities (Level 1, Level 2 or Level 3).

Loan servicing rights: The fair value of loan servicing rights is determined using a discount rate, a weighted average prepayment speed, and other economic factors (Level 2).

Deposits: The fair value of noninterest-bearing demand deposits and savings, NOW and money market deposits is the amount payable as of the reporting date (Level 1). The fair value of fixed-maturity certificates of deposit is estimated using rates currently offered for deposits with similar remaining maturities (Level 2).

Short-term borrowings: Federal funds purchased and other short-term borrowings generally have an original term to maturity of 30 days or less and, therefore, their carrying amount is a reasonable estimate of fair value (Level 1). The fair value of securities sold under agreements to repurchase is determined using end of day market prices (Level 1).

Other borrowings: The fair value of medium-term notes, subordinated debt and senior bank notes is determined using market quotes (Level 2). The fair value of FHLB advances is determined using calculated prices for new FHLB advances with similar risk characteristics (Level 3). The fair value of other debt is determined using comparable security market prices or dealer quotes (Level 2).

Standby letters of credit: Fair values for standby letters of credit are based on fees currently charged to enter into similar agreements. The fair value for standby letters of credit was recorded in “Accrued expenses and other liabilities” on the consolidated balance sheet in accordance with FASB ASC 460-10 (FIN 45) (Level 3).

Off-balance sheet financial instruments: Fair values for off-balance sheet credit-related financial instruments are based on fees currently charged to enter into similar agreements. For further information regarding the amounts of these financial instruments, see Notes 21 and 22.

Derivative_Financial_Instrumen

Derivative Financial Instruments	12 Months Ended
Derivative Financial Instruments	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments
	NOTE 20 – 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 $608.0 million and $464.5 million at December 31, 2014 and 2013, respectively. The December 31, 2014 balances consist of $38.0 million notional amount of receive-fixed pay variable interest rate swaps on certain of its FHLB advances, $525.0 million notional amount of pay-fixed, receive variable interest rate swaps on certain of its FHLB advances and $45.0 million notional amount of receive-fixed pay variable interest rate swaps on certain of its commercial loans. The December 31, 2013 balances consist of $39.5 million notional amount of receive-fixed pay variable interest rate swaps and $425.0 million notional amount of pay-fixed, receive variable interest rate swaps on certain of its FHLB advances. These hedges were entered into to manage interest rate risk. These derivative instruments are recognized on the balance sheet at their fair value and are not reported on a net basis.

	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, 2014, the notional amount of the interest rate lock commitments and forward commitments were $19.7 million and $29.1 million, respectively. At December 31, 2013, the notional amount of the interest rate lock commitments and forward commitments were $10.5 million and $17.2 million, respectively. 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. All derivative instruments are recognized on the balance sheet at their fair value.

	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 $435.6 million and $435.6 million, respectively, at December 31, 2014. At December 31, 2013, the notional amounts of the customer derivative instruments and the offsetting counterparty derivative instruments were $436.8 million and $436.8 million, respectively. These derivative contracts do not qualify for hedge accounting. These instruments include interest rate swaps, caps and collars. Commonly, Old National will economically hedge significant exposures related to these derivative contracts entered into for the benefit of customers by entering into offsetting contracts with approved, reputable, independent counterparties with substantially matching terms.

	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 $0.6 million will be reclassified to interest income and $0.8 million will be reclassified to interest expense.



	The following tables summarize the fair value of derivative financial instruments utilized by Old National:



			Asset Derivatives
			December 31, 2014					December 31, 2013
	(dollars in thousands)		Balance		Fair			Balance		Fair
					Value					Value
			Sheet					Sheet

			Location					Location
	Derivatives designated as hedging instruments
	Interest rate contracts		Other assets		$	4,278		Other assets		$	3,545

	Total derivatives designated as hedging instruments				$	4,278				$	3,545

	Derivatives not designated as hedging instruments
	Interest rate contracts		Other assets		$	13,780		Other assets		$	18,279
	Mortgage contracts		Other assets			514		Other assets			263

	Total derivatives not designated as hedging instruments				$	14,294				$	18,542

	Total derivatives				$	18,572				$	22,087


			Liability Derivatives
			December 31, 2014					December 31, 2013
	(dollars in thousands)		Balance		Fair			Balance		Fair
					Value					Value
			Sheet					Sheet

			Location					Location
	Derivatives designated as hedging instruments
	Interest rate contracts		Other liabilities		$	9,951		Other liabilities		$	1,218

	Total derivatives designated as hedging instruments				$	9,951				$	1,218

	Derivatives not designated as hedging instruments
	Interest rate contracts		Other liabilities		$	13,917		Other liabilities		$	18,505

	Total derivatives not designated as hedging instruments				$	13,917				$	18,505

	Total derivatives				$	23,868				$	19,723




	The effect of derivative instruments on the consolidated statement of income were as follows for the years ended December 31:



(dollars in thousands)				2014			2013				2012
Derivatives in		Location of Gain or (Loss)		Amount of Gain or (Loss)
		Recognized in Income on		Recognized in Income on
Fair Value Hedging		Derivative		Derivative

Relationships
Interest rate contracts (1)		Interest income / (expense)		$	1,002		$	1,748			$	2,114
Interest rate contracts (2)		Other income / (expense)			275			(33	)			677

Total				$	1,277		$	1,715			$	2,791


Derivatives in		Location of Gain or (Loss)		Amount of Gain or (Loss)
		Recognized in Income on		Recognized in Income on
Cash Flow Hedging		Derivative		Derivative

Relationships
Interest rate contracts (1)		Interest income / (expense)		$	—		$	—			$	241

Total				$	—		$	—			$	241


Derivatives Not Designated as		Location of Gain or (Loss)		Amount of Gain or (Loss)
		Recognized in Income on		Recognized in Income on
Hedging Instruments		Derivative		Derivative
Interest rate contracts (3)		Other income / (expense)		$	88		$	209			$	143
Mortgage contracts		Mortgage banking revenue			252			(215	)			261

Total				$	340		$	(6	)		$	404



-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, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	NOTE 21 – 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 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.

	In November 2010, Old National was named in a class action lawsuit in Vanderburgh Circuit Court challenging our checking account practices associated with the assessment of overdraft fees. The theory set forth by plaintiffs in this case is similar to other class action complaints filed against other financial institutions in recent years and settled for substantial amounts. On May 1, 2012, the plaintiff was granted permission to file a First Amended Complaint which named additional plaintiffs and amended certain claims. The plaintiffs seek damages, and other relief, including treble damages, attorneys’ fees and costs pursuant to the Indiana Crime Victim’s Relief Act. On June 13, 2012, Old National filed a motion to dismiss the First Amended Complaint, which was subsequently denied by the Court. On September 7, 2012, the plaintiffs filed a motion for class certification, which was granted on March 20, 2013, and provides for a class of “All Old National Bank customers in the State of Indiana who had one or more consumer accounts and who, within the applicable statutes of limitation through August 15, 2010, incurred an overdraft fee as a result of Old National Bank’s practice of sequencing debit card and ATM transactions from highest to lowest.” Old National sought an interlocutory appeal on the issue of class certification on April 2, 2013, which was subsequently denied.

	Old National does not believe that relevant facts are in dispute or that plaintiffs have stated a claim upon which relief may be granted under Indiana law. Accordingly, on June 11, 2013, Old National moved for summary judgment. On September 16, 2013, a hearing was held on the summary judgment motion and on September 27, 2013, the Circuit Court ordered the parties to mediation and informed the parties that “Court will be denying the motion for summary judgment upon receiving the report of the mediator.”

	The parties subsequently met twice with the mediator and were unable to reach an agreement to resolve the dispute. Old National’s pending Motion for Summary Judgment filed June 11, 2013, was denied by the Circuit Court on April 14, 2014, and on April 23, 2014, Old National sought leave from the Circuit Court to file an interlocutory appeal to the Indiana Court of Appeals. On May 28, 2014, the Circuit Court granted Old National’s motion. On June 5, 2014, Old National filed with the Court of Appeals a “Combined Motion to Accept Jurisdiction Over Interlocutory Appeal Pursuant to Appellate Rule 14(B) and Motion to Stay Trial Court Proceedings Pending Appeal Pursuant to Appellate Rule 14(H)”. On July 11, 2014, the Court of Appeals granted both of Old National’s Motions, thereby accepting the appeal and issuing a Stay of the case before the Circuit Court. Old National believes it has meritorious defenses to the claims brought by the plaintiffs. Old National expects a decision on the Appeal by the Court of Appeals sometime in the first six months of 2015. At this phase of the litigation, it is not possible for management of Old National to determine the probability of a material adverse outcome or reasonably estimate the amount of any loss.

	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 index. As of December 31, 2014, 121 of Old National’s 195 total financial centers are subject to operating leases while 74 are owned. The leases have original terms ranging from less than one year to twenty-four years, and Old National has the right, at its option, to extend the term of certain leases for four additional successive terms of five years. Old National does not have any material sub-lease agreements.

	Total rental expense was $29.0 million in 2014, $29.1 million in 2013 and $32.0 million in 2012. The following is a summary of future minimum lease commitments as of December 31, 2014:



	(dollars in thousands)
	2015	$	32,338
	2016		31,078
	2017		30,690
	2018		29,281
	2019		27,505
	Thereafter		229,452

	Total	$	380,344


	As of December 31, 2014 and 2013, Old National had $68.3 million and $74.4 million, respectively, of deferred gains remaining associated with prior sale leaseback transactions. The leases had original terms ranging from five to twenty-four years. These gains will be recognized over the remaining term of the leases.

	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 $1.584 billion and standby letters of credit of $65.3 million at December 31, 2014. At December 31, 2014, approximately $1.487 billion of the loan commitments had fixed rates and $97.1 million had floating rates, with the fixed interest rates ranging from 0% to 21%. At December 31, 2013, loan commitments were $1.271 billion and standby letters of credit were $62.0 million. These commitments are not reflected in the consolidated financial statements. At December 31, 2014 and 2013, the balance of the allowance for credit losses on unfunded loan commitments was $4.4 million and $2.7 million, respectively.

	At December 31, 2014 and 2013, Old National had credit extensions of $13.0 million and $15.6 million, respectively, with various unaffiliated banks related to letter of credit commitments issued on behalf of Old National’s clients. At December 31, 2014 and 2013, Old National provided collateral to the unaffiliated banks to secure credit extensions totaling $11.5 million and $12.4 million, respectively. Old National did not provide collateral for the remaining credit extensions

Financial_Guarantees

Financial Guarantees	12 Months Ended
Financial Guarantees	Dec. 31, 2014
Guarantees [Abstract]
Financial Guarantees	NOTE 22 – 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 (FIN 45, Guarantor’s Accounting and Disclosure Requirements for Guarantees, Including Indirect Guarantees of Indebtedness of Others), which requires the Company to record the instruments at fair value. Standby letters of credit guarantees are issued in connection with agreements made by clients to counterparties. Standby letters of credit are contingent upon failure of the client to perform the terms of the underlying contract. Credit risk associated with standby letters of credit is essentially the same as that associated with extending loans to clients and is subject to normal credit policies. The term of these standby letters of credit is typically one year or less. At December 31, 2014, the notional amount of standby letters of credit was $65.3 million, which represented the maximum amount of future funding requirements, and the carrying value was $0.4 million. At December 31, 2013, the notional amount of standby letters of credit was $62.0 million, which represented the maximum amount of future funding requirements, and the carrying value was $0.4 million.

	Old National entered into a risk participation in an interest rate swap during the second quarter of 2007, which had a notional amount of $7.6 million at December 31, 2014. 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 $13.5 million at December 31, 2014.

Regulatory_Restrictions

Regulatory Restrictions	12 Months Ended
Regulatory Restrictions	Dec. 31, 2014
Text Block [Abstract]
Regulatory Restrictions	NOTE 23 - 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 $67.9 million as of December 31, 2014 and $50.3 million as of December 31, 2013. In addition, Old National had $0.2 million and $0.8 million as of December 31, 2014 and 2013, respectively, in cash and due from banks which was held as collateral for collateralized swap positions.
	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 2012, 2013 or 2014 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 sheet items as calculated under regulatory accounting practices. The capital amounts and classifications are also subject to qualitative judgments by the regulators about components, risk weightings and other factors. Prompt corrective action provisions are not applicable to bank holding companies. Quantitative measures established by regulation to ensure capital adequacy require Old National and Old National Bank to maintain minimum amounts and ratios as set forth in the following table.
	At December 31, 2014, 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. To be categorized as well-capitalized, Old National Bank must maintain minimum total risk-based, Tier 1 risked-based and Tier 1 leverage ratios.

	The following table summarizes capital ratios for Old National and Old National Bank as of December 31:


		Actual					For Capital					For Well
		Actual					Adequacy Purposes					Capitalized Purposes
	(dollars in thousands)	Amount		Ratio			Amount		Ratio			Amount		Ratio
	2014
	Total capital to risk-weighted assets
	Old National Bancorp	$	996,929		13.59	%	$	586,722		8	%	$	N/A		N/A	%
	Old National Bank		949,596		13.02			583,266		8			729,082		10
	Tier 1 capital to risk-weighted assets
	Old National Bancorp		944,649		12.88			293,361		4			N/A		N/A
	Old National Bank		897,316		12.31			291,633		4			437,449		6
	Tier 1 capital to average assets
	Old National Bancorp		944,649		8.79			429,935		4			N/A		N/A
	Old National Bank		897,316		8.41			426,873		4			533,591		5
	2013
	Total capital to risk-weighted assets
	Old National Bancorp	$	871,076		15.19	%	$	458,717		8	%	$	N/A		N/A	%
	Old National Bank		720,313		12.67			454,685		8			568,356		10
	Tier 1 capital to risk-weighted assets
	Old National Bancorp		821,281		14.32			229,358		4			N/A		N/A
	Old National Bank		670,518		11.8			227,342		4			341,014		6
	Tier 1 capital to average assets
	Old National Bancorp		821,281		8.92			368,092		4			N/A		N/A
	Old National Bank		670,518		7.35			364,793		4			455,992		5

Parent_Company_Financial_State

Parent Company Financial Statements	12 Months Ended
Parent Company Financial Statements	Dec. 31, 2014
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Parent Company Financial Statements	NOTE 24 – 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)		2014				2013
	Assets
	Deposits in affiliate bank		$	168,467			$	75,637
	Trading securities – at fair value			3,881				3,566
	Investment securities – available-for-sale			1,338				2,025
	Investment in affiliates:
	Banking subsidiaries			1,398,835				989,585
	Non-banks			49,284				42,706
	Other assets			91,064				103,423

	Total assets		$	1,712,869			$	1,216,942

	Liabilities and Shareholders’ Equity
	Other liabilities		$	31,989			$	29,564
	Other borrowings			215,116				24,738
	Shareholders’ equity			1,465,764				1,162,640

	Total liabilities and shareholders’ equity		$	1,712,869			$	1,216,942




	OLD NATIONAL BANCORP (PARENT COMPANY ONLY)

	CONDENSED STATEMENTS OF INCOME
			Years Ended December 31,
	(dollars in thousands)		2014				2013				2012
	Income
	Dividends from affiliates		$	65,292			$	116,073			$	53,042
	Net securities gains			170				416				165
	Other income			1,554				1,864				1,710
	Other income from affiliates			79				138				153

	Total income			67,095				118,491				55,070

	Expense
	Interest on borrowings			3,837				624				786
	Other expenses			11,357				11,228				14,270

	Total expense			15,194				11,852				15,056

	Income before income taxes and equity in undistributed earnings of affiliates			51,901				106,639				40,014
	Income tax benefit			(4,020	)			(4,044	)			(5,909	)

	Income before equity in undistributed earnings of affiliates			55,921				110,683				45,923
	Equity in undistributed earnings of affiliates			47,746				(9,763	)			45,752

	Net income		$	103,667			$	100,920			$	91,675




	OLD NATIONAL BANCORP (PARENT COMPANY ONLY)

CONDENSED STATEMENT OF CASH FLOWS
		Years Ended December 31,
(dollars in thousands)		2014				2013				2012
Cash Flows From Operating Activities
Net income		$	103,667			$	100,920			$	91,675

Adjustments to reconcile net income to cash provided by operating activities:
Depreciation			11				8				15
Net securities gains			(270	)			(416	)			(134	)
Stock compensation expense			4,162				3,958				3,317
(Increase) decrease in other assets			18,540				(17,972	)			9,056
Increase (decrease) in other liabilities			286				3,095				(496	)
Equity in undistributed earnings of affiliates			(47,746	)			9,763				(45,752	)

Total adjustments			(25,017	)			(1,564	)			(33,994	)

Net cash flows provided by operating activities			78,650				99,356				57,681

Cash Flows From Investing Activities
Net cash and cash equivalents of acquisitions			(82,975	)			—				1
Purchases of investment securities			(45	)			(53	)			(147	)
Net advances to affiliates			(3,832	)			—				—
Purchases of premises and equipment			(1,032	)			(60	)			(173	)

Net cash flows used in investing activities			(87,884	)			(113	)			(319	)

Cash Flows From Financing Activities
Payments related to retirement of debt			—				—				(16,000	)
Proceeds from issuance of other borrowings			175,000				—				—
Cash dividends paid on common stock			(48,181	)			(40,278	)			(34,657	)
Common stock repurchased			(25,830	)			(24,292	)			(3,990	)
Proceeds from exercise of stock options, including tax benefit			749				1,412				717
Common stock issued			326				290				254

Net cash flows provided by (used in) financing activities			102,064				(62,868	)			(53,676	)

Net increase in cash and cash equivalents			92,830				36,375				3,686
Cash and cash equivalents at beginning of period			75,637				39,262				35,576

Cash and cash equivalents at end of period		$	168,467			$	75,637			$	39,262

Segment_Information

Segment Information	12 Months Ended
Segment Information	Dec. 31, 2014
Segment Reporting [Abstract]
Segment Information	NOTE 25 – SEGMENT INFORMATION

	Our business segments are defined as Banking, Insurance, and Other and are described below:

	Banking

	The banking segment provides a wide range of financial products and services to consumers and businesses. Loan products include commercial, commercial real estate, mortgage and other consumer loans. Deposit products include checking, savings, and time deposit accounts. This segment also provides cash management, private banking, brokerage, trust and investment advisory services. Products and services are delivered to customers in the states of Indiana, Kentucky, Illinois and Michigan through our branch locations, ATMs, on-line banking services, 24-hour telephone banking, client care call center, and a mobile banking service.

	Insurance

	The insurance segment offers full-service insurance brokerage services including commercial property and casualty, surety, loss control services, employee benefits consulting and administration, and personal insurance. Our agencies offer products that are issued and underwritten by various insurance companies not affiliated with us. In addition, we have two affiliated third party claims management companies that handle service claims for self-insured clients.



	Other

	Other Corporate Administrative units such as Human Resources or Finance, provide a wide-range of support to our other income earning segments. Expenses incurred by these support units are charged to the business segments through an internal cost allocation process, which may not be comparable to that of other companies. The other segment includes the unallocated portion of other corporate support functions, the elimination of intercompany transactions and our Corporate Treasury unit. Corporate Treasury activities consist of corporate asset and liability management. This unit’s assets and liabilities (and related interest income and expense) consist of investment securities, corporate-owned life insurance, and certain borrowings.

	During the third quarter of 2014, Old National merged American National Trust & Investment Management Corp. into Old National Bank. As part of the merger, Old National re-evaluated its business segments and, as of September 30, 2014, Old National changed the composition of its reportable segments to those described above and restated all prior period information. The Wealth Management segment has been aggregated into the banking segment as this business has never been quantitatively significant. In addition, wealth management and banking have the same customers and distribution channels, similar products and services as well as similar economic performance.



	Selected business segment financial information as of and for the years ended December 31, 2014, 2013 and 2012 were as follows:



	SEGMENT INFORMATION
	(dollars in thousands)	Banking			Insurance		Other			Total
	2014
	Net interest income	$	370,132		$	11	$	(3,773	)	$	366,370
	Noninterest income		121,624			41,314		2,191			165,129
	Noncash items:
	Depreciation and software amortization		13,950			138		551			14,639
	Provision for loan losses		3,097			—		—			3,097
	Amortization of intangibles		7,507			1,613		—			9,120
	Income tax expense (benefit)		41,056			1,381		(4,140	)		38,297
	Segment profit		109,776			2,428		(8,537	)		103,667
	Segment assets		11,500,974			62,537		84,040			11,647,551

	2013
	Net interest income	$	317,913		$	15	$	(504	)	$	317,424
	Noninterest income		143,953			38,657		2,148			184,758
	Noncash items:
	Depreciation and software amortization		12,082			142		299			12,523
	Provision for loan losses		(2,319	)		—		—			(2,319	)
	Amortization of intangibles		6,489			1,673		—			8,162
	Income tax expense (benefit)		44,489			1,052		(3,944	)		41,597
	Segment profit		104,265			1,925		(5,270	)		100,920
	Segment assets		9,446,349			65,328		70,067			9,581,744

	2012
	Net interest income	$	309,321		$	21	$	(585	)	$	308,757
	Noninterest income		151,410			36,732		1,674			189,816
	Noncash items:
	Depreciation and software amortization		11,869			271		964			13,104
	Provision for loan losses		5,030			—		—			5,030
	Amortization of intangibles		6,100			1,841		—			7,941
	Income tax expense (benefit)		40,569			1,397		(5,856	)		36,110
	Segment profit		96,882			1,755		(6,962	)		91,675
	Segment assets		9,413,281			62,956		67,386			9,543,6

Interim_Financial_Data_Unaudit

Interim Financial Data (Unaudited)	12 Months Ended
Interim Financial Data (Unaudited)	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Interim Financial Data (Unaudited)	NOTE 26 – INTERIM FINANCIAL DATA (UNAUDITED)

	The following table details the quarterly results of operations for the years ended December 31, 2014 and 2013.



	INTERIM FINANCIAL DATA
	(unaudited, dollars	Quarters Ended 2014									Quarters Ended 2013
	and shares in thousands,	December 31		September 30		30-Jun			31-Mar		December 31		September 30			30-Jun			31-Mar

	except per share data)
	Interest income	$	97,318	$	114,618	$	89,528		$	88,265	$	86,132	$	83,894		$	85,682		$	86,102
	Interest expense		7,275		6,251		5,046			4,787		4,945		5,898			6,491			7,052

	Net interest income		90,043		108,367		84,482			83,478		81,187		77,996			79,191			79,050
	Provision for loan losses		869		2,591		(400	)		37		2,253		(1,724	)		(3,693	)		845
	Noninterest income		50,495		34,418		39,653			40,563		44,444		47,755			46,244			46,315
	Noninterest expense		100,117		99,965		98,104			88,252		88,227		96,658			86,916			90,183

	Income before income taxes		39,552		40,229		26,431			35,752		35,151		30,817			42,212			34,337
	Income tax expense		10,302		11,095		7,658			9,242		10,602		6,869			13,734			10,392

	Net income	$	29,250	$	29,134	$	18,773		$	26,510	$	24,549	$	23,948		$	28,478		$	23,945

	Net income per share:
	Basic	$	0.25	$	0.26	$	0.18		$	0.27	$	0.24	$	0.24		$	0.28		$	0.24
	Diluted		0.25		0.26		0.18			0.26		0.25		0.23			0.28			0.24

	Average shares:
	Basic		115,924		111,428		103,904			99,797		100,153		100,645			100,981			101,081
	Diluted		116,592		111,947		104,361			100,325		100,718		101,131			101,352			101,547

	Quarterly results, most notably interest income, noninterest income and noninterest expense, were impacted by the acquisition of 24 bank branches from Bank of America on July 12, 2013, the acquisition of Tower Financial Corporation on April 25, 2014, the acquisition of United Bancorp, Inc. on July 31, 2014, and the acquisition of LSB Financial Corp. on November 1, 2014. Also impacting interest income and noninterest income were fluctuations in the accretion income and offsetting amortization of our indemnification asset associated with the July 2011 FDIC-assisted acquisition of Integra.

Basis_of_Presentation_and_Sign1

Basis of Presentation and Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2014

Accounting Policies [Abstract]

Basis of Presentation

BASIS OF PRESENTATION

All significant intercompany transactions and balances have been eliminated.

Trading Securities

TRADING SECURITIES

Investment Securities

INVESTMENT SECURITIES

Federal Home Loan Bank (FHLB) Stock

FEDERAL HOME LOAN BANK (“FHLB”) STOCK

Loans Held for Sale

LOANS HELD FOR SALE

Loans

LOANS

Allowance for Loan Losses

ALLOWANCE FOR LOAN LOSSES

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

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), amortization of goodwill and indefinite-lived assets is not recorded. However, the recoverability of goodwill and other intangible assets are annually tested for impairment. Other intangible assets, including core deposits and customer business relationships, are amortized primarily on an accelerated cash flow basis over their estimated useful lives, generally over a period of 7 to 25 years.

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. The amount of company owned life insurance at December 31, 2014 and 2013 was $325.6 million and $275.1 million, respectively.

Loan Servicing Rights

LOAN SERVICING RIGHTS

Derivative Financial Instruments

DERIVATIVE FINANCIAL INSTRUMENTS

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.

Credit-Related Financial Instruments

CREDIT-RELATED FINANCIAL INSTRUMENTS

Foreclosed Assets

FORECLOSED ASSETS

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 REPURCHASE

Covered Assets, Loss Share Agreement and Indemnification Asset

COVERED ASSETS, LOSS SHARE AGREEMENTS AND INDEMNIFICATION ASSET

Net Income Per Share

NET INCOME PER SHARE

The following table reconciles basic and diluted net income per share for the years ended December 31.

EARNINGS PER SHARE RECONCILIATION

(dollars and shares in thousands, except per share data)

2014

2013

2012

Basic Earnings Per Share

Net income

103,667

100,920

91,675

Weighted average common shares outstanding

107,818

100,712

96,440

Basic Earnings Per Share

0.96

0.95

Diluted Earnings Per Share

Net income

103,667

100,920

91,675

Weighted average common shares outstanding

107,818

100,712

96,440

Effect of dilutive securities:

Restricted stock (1)

488

455

379

Stock options (2)

Weighted average shares outstanding

108,365

101,198

96,833

Diluted Earnings Per Share

0.95

-1

-2

Stock-Based Compensation

STOCK-BASED COMPENSATION

Income Taxes

INCOME TAXES

We recognize interest and/or penalties related to income tax matters in income tax expense.

Loss Contingencies

LOSS CONTINGENCIES

Statement of Cash Flows Data

STATEMENT OF CASH FLOWS DATA

Impact of Accounting Changes

IMPACT OF ACCOUNTING CHANGES

Reclassifications

RECLASSIFICATIONS

Certain prior year amounts have been reclassified to conform to the 2014 presentation. Such reclassifications had no effect on net income or shareholders’ equity and were insignificant amounts.

Basis_of_Presentation_and_Sign2

Basis of Presentation and Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2014
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.


	EARNINGS PER SHARE RECONCILIATION
	(dollars and shares in thousands, except per share data)		2014		2013		2012
	Basic Earnings Per Share
	Net income		$	103,667	$	100,920	$	91,675

	Weighted average common shares outstanding			107,818		100,712		96,440

	Basic Earnings Per Share		$	0.96	$	1	$	0.95


	Diluted Earnings Per Share
	Net income		$	103,667	$	100,920	$	91,675

	Weighted average common shares outstanding			107,818		100,712		96,440
	Effect of dilutive securities:
	Restricted stock (1)			488		455		379
	Stock options (2)			59		31		14

	Weighted average shares outstanding			108,365		101,198		96,833

	Diluted Earnings Per Share		$	0.95	$	1	$	0.95


	-1	0, 0 and 6 shares of restricted stock and restricted stock units were not included in the computation of net income per diluted share at December 31, 2014, 2013 and 2012 respectively, because the effect would be antidilutive.
	-2	Options to purchase 976 shares, 1,007 shares and 3,284 shares outstanding at December 31, 2014, 2013, and 2012, 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.

Acquisition_and_Divestiture_Ac1

Acquisition and Divestiture Activity (Tables)	12 Months Ended
Acquisition and Divestiture Activity (Tables)	Dec. 31, 2014
Summary of Unaudited Pro-forma Information	Summary of Unaudited Pro-forma Information
	(dollars in thousands)		2014			2013
	Revenue (1)		$	590,492		$	609,261
	Net income		$	138,056		$	145,635


	-1	Net interest income plus noninterest income.
Bank of America [Member]
Schedule of Purchase Price Allocation	A summary of the final purchase price allocation is as follows (in thousands):


	Cash and cash equivalents		$	562,906
	Loans			5,638
	Premises and equipment			12,559
	Accrued interest receivable			15
	Other assets			331
	Deposits			(565,106	)
	Accrued expenses and other liabilities			(246	)

	Net tangible assets acquired			16,097
	Definite-lived intangible assets acquired			3,462
	Goodwill			13,347

	Purchase price		$	32,906

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	)
	Short-term borrowings			(18,898	)
	Other borrowings			(21,113	)
	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
			Fair Value			Useful
			(in millions)			Lives
						(Years)
	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 Acquisition
			of Acquired Loans			Amounts Receivable		Date of Contractual Cash Flows
			at Acquisition Date			at Acquisition Date		Not Expected to be Collected
	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	the purchase price for the United acquisition is allocated 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	)
	Short-term borrowings			(10,420	)
	Other borrowings			(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
			Fair Value			Useful Lives (Years)
			(in millions)
	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 Acquisition
			of Acquired Loans			Amounts Receivable		Date of Contractual Cash Flows
			at Acquisition Date			at Acquisition Date		Not Expected to be Collected
	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	The purchase price for the LSB acquisition is allocated 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			236,201
	Premises and equipment			6,492
	Accrued interest receivable			1,044
	Other real estate owned			30
	Company-owned life insurance			7,438
	Other assets			11,182
	Deposits			(292,068	)
	Other borrowings			(15,203	)
	Accrued expenses and other liabilities			(4,582	)

	Net tangible assets acquired			26,027
	Definite-lived intangible assets acquired			2,618
	Loan servicing rights			990
	Goodwill			39,960

	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			Gross Contractual		Best Estimate at Acquisition
			of Acquired Loans			Amounts Receivable		Date of Contractual Cash Flows
			at Acquisition Date			at Acquisition Date		Not Expected to be Collected
	Acquired receivables subject to ASC 310-30		$	11,986		$	24,493	$	9,903
	Acquired receivables not subject to ASC 310-30		$	224,215		$	340,832	$	57,884

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Loss) (Tables)	12 Months Ended
Accumulated Other Comprehensive Income (Loss) (Tables)	Dec. 31, 2014
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, 2014, 2013 and 2012:



			Changes in AOCI by Component (a)
	(dollars in thousands)		Unrealized Gains				Unrealized Gains			Gains and			Defined			Total
			and Losses on				and Losses on			Losses on			Benefit
			Available-for-Sale				Held-to-Maturity			Cash Flow			Pension
			Securities				Securities			Hedges			Plans
	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) (b)			(6,031	)			991			154			(2,695	)		(7,581	)

	Net current-period 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	)

	2013
	Balance at January 1, 2013		$	39,054			$	3,269		$	—		$	(12,522	)	$	29,801
	Other comprehensive income (loss) before reclassifications			(57,958	)			(20,224	)		(190	)		—			(78,372	)
	Amounts reclassified from accumulated other comprehensive income (loss) (b)			(2,204	)			188			—			6,121			4,105

	Net current-period other comprehensive income (loss)			(60,162	)			(20,036	)		(190	)		6,121			(74,267	)

	Balance at December 31, 2013		$	(21,108	)		$	(16,767	)	$	(190	)	$	(6,401	)	$	(44,466	)

	2012
	Balance at January 1, 2012		$	24,612			$	4,745		$	145		$	(14,498	)	$	15,004
	Other comprehensive income (loss) before reclassifications			22,808				(954	)		—			—			21,854
	Amounts reclassified from accumulated other comprehensive income (loss) (b)			(8,366	)			(522	)		(145	)		1,976			(7,057	)

	Net current-period other comprehensive income (loss)			14,442				(1,476	)		(145	)		1,976			14,797

	Balance at December 31, 2012		$	39,054			$	3,269		$	—		$	(12,522	)	$	29,801



	(a)	All amounts are net of tax. Amounts in parentheses indicate debits.
	(b)	See tables below for details about reclassifications.
Reclassification out of Accumulated Other Comprehensive Income	The following tables summarize the significant amounts reclassified out of each component of AOCI for the years ended December 31, 2014, 2013 and 2012:



	Reclassifications out of Accumulated Other Comprehensive Income (Loss)

	Year Ended December 31, 2014 (a)
	Details about Accumulated		Amount Reclassified from				Affected Line Item in the Statement
			Accumulated Other
	Other Comprehensive Income		Comprehensive Income (Loss)				Where Net Income is Presented

	(Loss) Components
	Unrealized gains and losses on available-for-sale securities
			$	9,830			Net securities gains
				(100	)		Impairment losses

				9,730			Total before tax
				(3,699	)		Tax (expense) or benefit

			$	6,031			Net of tax

	Unrealized gains and losses on held-to-maturity securities
			$	(1,437	)		Interest income/(expense)
				446			Tax (expense) or benefit

			$	(991	)		Net of tax

	Gains and losses on cash flow hedges
	Interest rate contracts		$	(248	)		Interest income/(expense)
				94			Tax (expense) or benefit

			$	(154	)		Net of tax

	Amortization of defined benefit pension items
	Actuarial gains/(losses)		$	6,266			(b)
	Amortization of net actuarial losses			(1,933	)		(b)
				(1,638	)		Tax (expense) or benefit

			$	2,695			Net of tax

	Total reclassifications for the period		$	7,581			Net of tax



	(a)	Amounts in parentheses indicate debits to profit/loss.
	(b)	This accumulated other comprehensive income (loss) component is included in the computation of net periodic pension cost. See Note 15 for additional details on our pension plans.



	Reclassifications out of Accumulated Other Comprehensive Income (Loss)

	Year Ended December 31, 2013 (a)
	Details about Accumulated		Amount Reclassified from				Affected Line Item in the Statement
			Accumulated Other
	Other Comprehensive Income		Comprehensive Income (Loss)				Where Net Income is Presented

	(Loss) Components
	Unrealized gains and losses on available-for-sale securities
			$	4,341			Net securities gains
				(1,000	)		Impairment losses

				3,341			Total before tax
				(1,137	)		Tax (expense) or benefit

		$	2,204			Net of tax

Unrealized gains and losses on held-to-maturity securities
		$	(225	)		Interest income/(expense)
			37			Tax (expense) or benefit

		$	(188	)		Net of tax

Gains and losses on cash flow hedges
Interest rate contracts		$	—			Interest income/(expense)
			—			Tax (expense) or benefit

		$	—			Net of tax

Amortization of defined benefit pension items
Actuarial gains/(losses)		$	(6,901	)		(b)
Amortization of net actuarial losses			(3,436	)		(b)
			4,216			Tax (expense) or benefit

		$	(6,121	)		Net of tax

Total reclassifications for the period		$	(4,105	)		Net of tax



(a)	Amounts in parentheses indicate debits to profit/loss.
(b)	This accumulated other comprehensive income (loss) component is included in the computation of net periodic pension cost. See Note 15 for additional details on our pension plans.



Reclassifications out of Accumulated Other Comprehensive Income (Loss)

Year Ended December 31, 2012
Details about Accumulated		Amount Reclassified from				Affected Line Item in the Statement
		Accumulated Other
Other Comprehensive Income		Comprehensive Income (Loss)				Where Net Income is Presented

(Loss) Components
Unrealized gains and losses on available-for-sale securities
		$	15,052			Net securities gains
			(1,414	)		Impairment losses

			13,638			Total before tax
			(5,272	)		Tax (expense) or benefit

		$	8,366			Net of tax

Unrealized gains and losses on held-to-maturity securities
		$	870			Interest income/(expense)
			(348	)		Tax (expense) or benefit

		$	522			Net of tax

Gains and losses on cash flow hedges
Interest rate contracts		$	240			Interest income/(expense)
			(95	)		Tax (expense) or benefit

		$	145			Net of tax

Amortization of defined benefit pension items
Actuarial gains/(losses)		$	1,903			(b)
Amortization of net actuarial losses			(5,197	)		(b)
			1,318			Tax (expense) or benefit

		$	(1,976	)		Net of tax

Total reclassifications for the period		$	7,057			Net of tax



(a)	Amounts in parentheses indicate debits to profit/loss.
(b)	This accumulated other comprehensive income (loss) component is included in the computation of net periodic pension cost. See Note 15 for additional details on our pension plans.

Investment_Securities_Tables

Investment Securities (Tables)	12 Months Ended
Investment Securities (Tables)	Dec. 31, 2014
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 and held-to-maturity investment securities portfolio at December 31 and the corresponding amounts of unrealized gains and losses therein:


	(dollars in thousands)		Amortized			Unrealized			Unrealized			Fair
	(dollars in thousands)		Cost			Gains			Losses			Value
	2014
	Available-for-Sale
	U.S. Treasury		$	14,978		$	196		$	(8	)	$	15,166
	U.S. government-sponsored entities and agencies			692,704			1,533			(8,286	)		685,951
	Mortgage-backed securities - Agency			1,233,811			18,219			(10,368	)		1,241,662
	States and political subdivisions			304,435			11,023			(917	)		314,541
	Pooled trust preferred securities			17,965			—			(11,358	)		6,607
	Other securities			395,076			2,338			(3,669	)		393,745

	Total available-for-sale securities		$	2,658,969		$	33,309		$	(34,606	)	$	2,657,672


	Held-to-Maturity
	U.S. government-sponsored entities and agencies		$	167,207		$	6,279		$	—		$	173,486
	Mortgage-backed securities - Agency			23,648			926			—			24,574
	States and political subdivisions			653,199			52,753			(77	)		705,875

	Total held-to-maturity securities		$	844,054		$	59,958		$	(77	)	$	903,935


	2013
	Available-for-Sale
	U.S. Treasury		$	12,995		$	118		$	—		$	13,113
	U.S. government-sponsored entities and agencies			456,123			464			(20,999	)		435,588
	Mortgage-backed securities - Agency			1,300,135			15,690			(26,567	)		1,289,258
	Mortgage-backed securities - Non-agency			17,036			376			—			17,412
	States and political subdivisions			260,398			10,112			(1,715	)		268,795
	Pooled trust preferred securities			19,215			—			(11,178	)		8,037
	Other securities			340,381			5,140			(5,523	)		339,998

	Total available-for-sale securities		$	2,406,283		$	31,900		$	(65,982	)	$	2,372,201


	Held-to-Maturity
	U.S. government-sponsored entities and agencies		$	170,621		$	7,749		$	—		$	178,370
	Mortgage-backed securities - Agency			35,443			906			(1	)		36,348
	States and political subdivisions			556,670			10,949			(1,579	)		566,040

	Total held-to-maturity securities		$	762,734		$	19,604		$	(1,580	)	$	780,758

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 investment securities, the resulting realized gains and realized losses, and other securities gains or losses were as follows for the years ended December 31:


	(dollars in thousands)		2014			2013			2012

	Proceeds from sales of available-for-sale securities		$	214,912		$	231,806		$	227,566
	Proceeds from calls of available-for-sale securities			123,141			172,465			149,409

	Total		$	338,053		$	404,271		$	376,975


	Realized gains on sales of available-for-sale securities		$	9,938		$	4,715		$	14,101
	Realized gains on calls of available-for-sale securities			154			50			802
	Realized losses on sales of available-for-sale securities			(128	)		(865	)		(9	)
	Realized losses on calls of available-for-sale securities			(471	)		(171	)		(7	)
	Other securities gains (1)			337			612			165

	Net securities gains		$	9,830		$	4,341		$	15,052


	-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.



			2014						Weighted			2013						Weighted
			2014						Average			2013						Average
	(dollars in thousands)		Amortized			Fair			Yield			Amortized			Fair			Yield
			Cost			Value						Cost			Value
	Maturity
	Available-for-Sale
	Within one year		$	39,429		$	40,019			4.82	%	$	23,839		$	23,884			3.52	%
	One to five years			435,460			437,972			1.88			216,236			222,293			2.79
	Five to ten years			631,821			630,599			2.25			534,720			519,692			2.39
	Beyond ten years			1,552,259			1,549,082			2.25			1,631,488			1,606,332			2.46

	Total		$	2,658,969		$	2,657,672			2.23	%	$	2,406,283		$	2,372,201			2.48	%

	Held-to-Maturity
	Within one year		$	1,508		$	1,511			3.14	%	$	72		$	73			3.46	%
	One to five years			25,417			26,579			3.9			15,035			15,757			4.02
	Five to ten years			182,854			189,953			3.37			164,138			169,345			3.19
	Beyond ten years			634,275			685,892			5.51			583,489			595,583			5.56

	Total		$	844,054		$	903,935			4.99	%	$	762,734		$	780,758			5.02	%

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
	(dollars in thousands)		Fair Value			Losses			Fair Value			Losses			Fair Value			Losses
	2014
	Available-for-Sale
	U.S. Treasury		$	9,524		$	(8	)	$	—		$	—		$	9,524		$	(8	)
	U.S. government-sponsored entities and agencies			180,488			(563	)		257,914			(7,723	)		438,402			(8,286	)
	Mortgage-backed securities – Agency			31,304			(122	)		386,788			(10,246	)		418,092			(10,368	)
	States and political subdivisions			41,481			(288	)		9,534			(629	)		51,015			(917	)
	Pooled trust preferred securities			—			—			6,607			(11,358	)		6,607			(11,358	)
	Other securities			115,973			(906	)		95,344			(2,763	)		211,317			(3,669	)

	Total available-for-sale		$	378,770		$	(1,887	)	$	756,187		$	(32,719	)	$	1,134,957		$	(34,606	)

	Held-to-Maturity
	States and political subdivisions		$	6,171		$	(77	)	$	—		$	—		$	6,171		$	(77	)

	Total held-to-maturity		$	6,171		$	(77	)	$	—		$	—		$	6,171		$	(77	)

	2013
	Available-for-Sale
	U.S. Treasury		$	1,900		$	—		$	—		$	—		$	1,900		$	—
	U.S. government-sponsored entities and agencies			357,793			(17,547	)		38,988			(3,452	)		396,781			(20,999	)
	Mortgage-backed securities – Agency			668,018			(23,455	)		41,200			(3,112	)		709,218			(26,567	)
	States and political subdivisions			45,077			(1,620	)		2,812			(95	)		47,889			(1,715	)
	Pooled trust preferred securities			—			—			8,037			(11,178	)		8,037			(11,178	)
	Other securities			209,915			(2,706	)		24,082			(2,817	)		233,997			(5,523	)

	Total available-for-sale		$	1,282,703		$	(45,328	)	$	115,119		$	(20,654	)	$	1,397,822		$	(65,982	)

	Held-to-Maturity
	Mortgage-backed securities – Agency		$	21,370		$	(1	)	$	—		$	—		$	21,370		$	(1	)
	States and political subdivisions			70,162			(1,579	)		—			—			70,162			(1,579	)

	Total held-to-maturity		$	91,532		$	(1,580	)	$	—		$	—		$	91,532		$	(1,580	)

Trust Preferred Securities
	Trust preferred securities December 31, 2014		Class			Lowest			Amortized			Fair			Unrealized			Realized			# of Issuers		Actual			Expected			Excess
						Credit			Cost			Value			Gain/			Losses			Currently		Deferrals and			Defaults as			Subordination
	(dollars in thousands)					Rating (1)									(Loss)			2014			Performing/		Defaults as a			a % of			as a % of
																					Remaining		Percent of			Remaining			Current
																							Original			Performing			Performing
																							Collateral			Collateral			Collateral
	Pooled trust preferred securities:
	Reg Div Funding 2004			B-2			D		$	4,012		$	217		$	(3,795	)	$	—			24/42		37.6	%		8	%		0	%
	Pretsl XXVII LTD			B			B			4,511			2,333			(2,178	)		—			33/46		23.9	%		15	%		37.6	%
	Trapeza Ser 13A			A2A			B+			9,442			4,057			(5,385	)		—			42/53		16.3	%		9.8	%		46.5	%

										17,965			6,607			(11,358	)		—
	Single Issuer trust preferred securities:
	First Empire Cap (M&T)						BB+			960			1,010			50			—
	First Empire Cap (M&T)						BB+			2,916			3,029			113			—
	Fleet Cap Tr V (BOA)						BB			3,381			2,800			(581	)		—
	JP Morgan Chase Cap XIII						BBB-			4,745			4,150			(595	)		—
	NB-Global						BB			751			800			49			—
	Chase Cap II						BBB-			793			843			50			—

										13,546			12,632			(914	)		—
	Total								$	31,511		$	19,239		$	(12,272	)	$	—



	-1	Lowest rating for the security provided by any nationally recognized credit rating agency.
Securities with Other-than-Temporary-Impairment	The following table details the remaining securities with other-than-temporary-impairment, their credit rating at December 31, 2014, and the related life-to-date credit losses recognized in earnings:


												Amount of other-than-temporary
						Lowest						impairment recognized in earnings
						Credit			Amortized			Year ended December 31,									Life-to
	(dollars in thousands)		Vintage			Rating (1)			Cost			2014			2013			2012			date
	Reg Div Funding			2004			D		$	4,012		$	—		$	—		$	165		$	5,685
	Limited partnership									667			100			—			—			100

	Total								$	4,679		$	100		$	—		$	165		$	5,785


	-1	Lowest rating for the security provided by any nationally recognized credit rating agency.

Finance_Receivables_and_Allowa1

Finance Receivables and Allowance for Credit Losses (Tables)	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
Schedule of Composition of Loans	The composition of loans at December 31 by lending classification was as follows:


	(dollars in thousands)		2014			2013
	Commercial (1)		$	1,629,600		$	1,373,415
	Commercial real estate:
	Construction			134,552			88,630
	Other			1,576,558			1,072,260
	Residential real estate			1,519,156			1,359,569
	Consumer credit:
	Heloc			360,320			251,102
	Auto			846,969			620,473
	Other			103,338			99,683
	Covered loans			147,708			217,832

	Total loans			6,318,201			5,082,964
	Allowance for loan losses			(44,297	)		(41,741	)
	Allowance for loan losses - covered loans			(3,552	)		(5,404	)

	Net loans		$	6,270,352		$	5,035,819


	-1	Includes direct finance leases of $19.3 million and $27.8 million at December 31, 2014 and 2013, respectively.
Schedule of Activity in Related Party Loans	Activity in related party loans during 2014 is presented in the following table:


	(dollars in thousands)		2014
	Balance, January 1		$	12,750
	New loans			5,101
	Repayments			(4,896	)
	Officer and director changes			7,605

	Balance, December 31		$	20,560

Schedule of Activity in Allowance for Loan Losses	Old National’s activity in the allowance for loan losses for the years ended December 31, 2014, 2013 and 2012 is as follows:


	(dollars in thousands)		Commercial			Commercial			Consumer			Residential			Unallocated			Total
	(dollars in thousands)		Commercial			Real Estate			Consumer			Residential			Unallocated			Total
	2014
	Allowance for loan losses:
	Beginning balance		$	16,565		$	22,401		$	4,940		$	3,239		$	—		$	47,145
	Charge-offs			(3,396	)		(2,352	)		(4,675	)		(793	)		—			(11,216	)
	Recoveries			2,986			2,576			3,056			205			—			8,823
	Provision			4,515			(5,277	)		3,548			311			—			3,097

	Ending balance		$	20,670		$	17,348		$	6,869		$	2,962		$	—		$	47,849


	2013
	Allowance for loan losses:
	Beginning balance		$	14,642		$	31,289		$	5,155		$	3,677		$	—		$	54,763
	Charge-offs			(3,810	)		(5,427	)		(6,279	)		(1,487	)		—			(17,003	)
	Recoveries			4,098			2,963			4,333			310			—			11,704
	Provision			1,635			(6,424	)		1,731			739			—			(2,319	)

	Ending balance		$	16,565		$	22,401		$	4,940		$	3,239		$	—		$	47,145


	2012
	Allowance for loan losses:
	Beginning balance		$	19,964		$	26,993		$	6,954		$	4,149		$	—		$	58,060
	Charge-offs			(7,636	)		(4,386	)		(8,094	)		(2,204	)		—			(22,320	)
	Recoveries			5,166			5,104			3,259			464			—			13,993
	Provision			(2,852	)		3,578			3,036			1,268			—			5,030

	Ending balance		$	14,642		$	31,289		$	5,155		$	3,677		$	—		$	54,763

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, 2014 and 2013 and other information regarding the allowance:


	(dollars in thousands)		Commercial			Commercial			Consumer			Residential			Unallocated			Total
	(dollars in thousands)		Commercial			Real Estate			Consumer			Residential			Unallocated			Total
	2014
	Allowance for credit losses:
	Ending balance: individually evaluated for impairment		$	7,280		$	2,945		$	—		$	—		$	—		$	10,225

	Ending balance: collectively evaluated for impairment		$	12,163		$	13,354		$	6,519		$	2,945		$	—		$	34,981

	Ending balance: noncovered loans acquired with deteriorated credit quality		$	406		$	1,049		$	67		$	17		$	—		$	1,539

	Ending balance: covered loans acquired with deteriorated credit quality		$	821		$	—		$	283		$	—		$	—		$	1,104

	Total allowance for credit losses		$	20,670		$	17,348		$	6,869		$	2,962		$	—		$	47,849

	Loans and leases outstanding:
	Ending balance: individually evaluated for impairment		$	38,485		$	45,335		$	—		$	—		$	—		$	83,820

	Ending balance: collectively evaluated for impairment		$	1,598,352		$	1,631,794		$	1,359,537		$	1,519,171		$	—		$	6,108,854

	Ending balance: loans acquired with deteriorated credit quality		$	2,770		$	37,394		$	7,073		$	133		$	—		$	47,370

	Ending balance: covered loans acquired with deteriorated credit quality		$	7,160		$	37,384		$	12,507		$	21,106		$	—		$	78,157

	Total loans and leases outstanding		$	1,646,767		$	1,751,907		$	1,379,117		$	1,540,410		$	—		$	6,318,201



	(dollars in thousands)		Commercial			Commercial			Consumer			Residential			Unallocated			Total
	(dollars in thousands)		Commercial			Real Estate			Consumer			Residential			Unallocated			Total
	2013
	Allowance for credit losses:
	Ending balance: individually evaluated for impairment		$	6,156		$	2,190		$	—		$	—		$	—		$	8,346

	Ending balance: collectively evaluated for impairment		$	9,980		$	14,816		$	4,494		$	3,088		$	—		$	32,378

	Ending balance: noncovered loans acquired with deteriorated credit quality		$	429		$	2,025		$	80		$	35		$	—		$	2,569

	Ending balance: covered loans acquired with deteriorated credit quality		$	—		$	3,370		$	366		$	116		$	—		$	3,852

	Total allowance for credit losses		$	16,565		$	22,401		$	4,940		$	3,239		$	—		$	47,145

	Loans and leases outstanding:
	Ending balance: individually evaluated for impairment		$	34,213		$	34,997		$	—		$	—		$	—		$	69,210

	Ending balance: collectively evaluated for impairment		$	1,355,608		$	1,106,971		$	1,019,576		$	1,359,564		$	—		$	4,841,719

	Ending balance: loans acquired with deteriorated credit quality		$	648		$	23,618		$	12,725		$	154		$	—		$	37,145

	Ending balance: covered loans acquired with deteriorated credit quality		$	12,281		$	77,232		$	17,673		$	27,704		$	—		$	134,890

	Total loans and leases outstanding		$	1,402,750		$	1,242,818		$	1,049,974		$	1,387,422		$	—		$	5,082,964

Schedule of Risk Category of Loans	As of December 31, 2014 and 2013, the risk category of loans, excluding covered loans, by class of loans is as follows:



	(dollars in thousands)		Commercial						Commercial Real Estate-						Commercial Real Estate-
									Construction						Other
	Corporate Credit Exposure Credit Risk Profile by Internally
	Assigned Grade		2014			2013			2014			2013			2014			2013
	Grade:
	Pass		$	1,442,904		$	1,237,983		$	119,958		$	74,815		$	1,374,191		$	943,781
	Criticized			89,775			90,545			2,229			9,383			102,805			35,473
	Classified – substandard			58,461			16,252			5,866			2,559			38,659			42,516
	Classified – nonaccrual			38,003			27,635			6,499			1,873			59,771			49,406
	Classified – doubtful			457			1,000			—			—			1,132			1,084

	Total		$	1,629,600		$	1,373,415		$	134,552		$	88,630		$	1,576,558		$	1,072,260

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, 2014 and 2013, excluding covered loans:


	2014		Consumer									Residential
	(dollars in thousands)		Heloc			Auto			Other
	Performing		$	357,205		$	845,708		$	101,811		$	1,505,188
	Nonperforming			3,115			1,261			1,527			13,968

	Total		$	360,320		$	846,969		$	103,338		$	1,519,156


	2013		Consumer									Residential
	(dollars in thousands)		Heloc			Auto			Other
	Performing		$	249,152		$	618,911		$	97,877		$	1,349,236
	Nonperforming			1,950			1,562			1,806			10,333

	Total		$	251,102		$	620,473		$	99,683		$	1,359,569

Schedule of Impaired Loans that are Individually Evaluated	The following table shows Old National’s impaired loans, excluding covered loans, which are individually evaluated as of December 31, 2014 and 2013, respectively. Of the loans purchased without FDIC loss share coverage, only those that have experienced subsequent impairment since the date acquired are included in the table below.


	(dollars in thousands)		Recorded			Unpaid			Related
			Investment			Principal			Allowance
						Balance
	December 31, 2014
	With no related allowance recorded:
	Commercial		$	25,483		$	25,854		$	—
	Commercial Real Estate - Construction			2,168			1,397			—
	Commercial Real Estate - Other			28,637			30,723			—
	Consumer			685			748			—
	Residential			588			658			—
	With an allowance recorded:
	Commercial			7,471			10,488			4,883
	Commercial Real Estate - Construction			98			98			11
	Commercial Real Estate - Other			14,432			16,503			2,934
	Consumer			1,543			1,543			77
	Residential			1,476			1,476			74

	Total Loans		$	82,581		$	89,488		$	7,979


	December 31, 2013
	With no related allowance recorded:
	Commercial		$	17,066		$	17,417		$	—
	Commercial Real Estate - Construction			525			633			—
	Commercial Real Estate - Other			15,746			22,550			—
	Consumer			324			342			—
	Residential			106			106			—
	With an allowance recorded:
	Commercial			9,282			12,304			4,723
	Commercial Real Estate - Construction			—			—			—
	Commercial Real Estate - Other			18,726			19,358			2,190
	Consumer			835			888			43
	Residential			2,239			2,295			112

	Total Loans		$	64,849		$	75,893		$	7,068

Schedule of Average Balance and Interest Income Recognized on Impaired Loans	The average balance of impaired loans, excluding covered loans, and interest income recognized on impaired loans for the years ended December 31, 2014 and 2013 are included in the table below.


	(dollars in thousands)		Average			Interest
			Recorded			Income
			Investment			Recognized (1)
	December 31, 2014
	With no related allowance recorded:
	Commercial		$	21,592		$	325
	Commercial Real Estate - Construction			1,347			69
	Commercial Real Estate - Other			21,560			328
	Consumer			505			14
	Residential			347			1
	With an allowance recorded:
	Commercial			7,579			94
	Commercial Real Estate - Construction			49			4
	Commercial Real Estate - Other			12,160			409
	Consumer			1,189			58
	Residential			1,857			69

	Total Loans		$	68,185		$	1,371


	December 31, 2013
	With no related allowance recorded:
	Commercial		$	11,815		$	135
	Commercial Real Estate - Construction			852			—
	Commercial Real Estate - Other			16,345			140
	Consumer			138			10
	Residential			62			1
	With an allowance recorded:
	Commercial			16,351			123
	Commercial Real Estate - Construction			1,614			—
	Commercial Real Estate - Other			22,317			134
	Consumer			526			40
	Residential			1,180			73

	Total Loans		$	71,200		$	656


	-1	The Company does not record interest on nonaccrual loans until principal is recovered.
Schedule of Past Due Financing Receivables	Old National’s past due financing receivables as of December 31 are as follows:


	(dollars in thousands)		30-59 Days			60-89 Days			Recorded			Nonaccrual			Total			Current
			Past Due			Past Due			Investment >						Past Due
									90 Days and
									Accruing
	December 31, 2014
	Commercial		$	649		$	813		$	33		$	38,460		$	39,955		$	1,589,645
	Commercial Real Estate:
	Construction			—			—			—			6,499			6,499			128,053
	Other			3,834			1,468			138			60,903			66,343			1,510,215
	Consumer:
	Heloc			577			376			—			3,115			4,068			356,252
	Auto			3,349			695			203			1,261			5,508			841,461
	Other			969			129			83			1,527			2,708			100,630
	Residential			11,606			3,959			1			13,968			29,534			1,489,622
	Covered loans			1,477			584			—			15,124			17,185			130,523

	Total		$	22,461		$	8,024		$	458		$	140,857		$	171,800		$	6,146,401


	December 31, 2013
	Commercial		$	1,532		$	13		$	—		$	28,635		$	30,180		$	1,343,235
	Commercial Real Estate:
	Construction			—			139			—			1,873			2,012			86,618
	Other			1,017			27			—			50,490			51,534			1,020,726
	Consumer:
	Heloc			527			119			—			1,950			2,596			248,506
	Auto			3,795			716			89			1,562			6,162			614,311
	Other			844			317			100			1,806			3,067			96,616
	Residential			8,588			2,823			35			10,333			21,779			1,337,790
	Covered Loans			1,831			730			14			31,793			34,368			183,464

	Total		$	18,134		$	4,884		$	238		$	128,442		$	151,698		$	4,931,266

Schedule of Loans by Class Modified as Troubled Debt Restructuring	The following table presents loans by class modified as TDRs that occurred during the year ended December 31, 2014:


	(dollars in thousands)		Number of			Pre-modification			Post-modification
			Loans			Outstanding Recorded			Outstanding Recorded
						Investment			Investment
	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 - other			28			1,586			1,586

	Total			97		$	19,011		$	19,011


	The following table presents loans by class modified as TDRs that occurred during the year ended December 31, 2013:


	(dollars in thousands)		Number of			Pre-modification			Post-modification
			Loans			Outstanding Recorded			Outstanding Recorded
						Investment			Investment
	Troubled Debt Restructuring:
	Commercial			35		$	15,155		$	15,155
	Commercial Real Estate - construction			1			60			60
	Commercial Real Estate - other			36			9,791			9,791
	Residential			14			1,901			1,901
	Consumer - other			49			1,484			1,484

	Total			135		$	28,391		$	28,391

Schedule of Troubled Debt Restructurings for which there was Payment Default	The following table presents loans by class modified as TDRs for which there was a payment default within the last twelve months following the modification during the year ended December 31, 2013.



	(dollars in thousands)		Number of			Recorded
	(dollars in thousands)		Contracts			Investment
	Troubled Debt Restructuring
	That Subsequently Defaulted:
	Commercial			3		$	32
	Commercial Real Estate			2			85

	Total			5		$	117

Schedule of Activity in Trouble Debt Restructurings	The following table presents activity in TDRs for the years ended December 31, 2014 and 2013:



	(dollars in thousands)		Commercial			Commercial			Consumer			Residential			Total
	(dollars in thousands)		Commercial			Real Estate			Consumer			Residential			Total
	2014
	Troubled debt restructuring:
	Balance, January 1, 2014		$	22,443		$	22,639		$	1,441		$	2,344		$	48,867
	(Charge-offs)/recoveries			126			795			(102	)		10			829
	Payments			(18,281	)		(9,722	)		(466	)		(466	)		(28,935	)
	Additions			13,696			3,554			1,586			175			19,011
	Removals – subsequent restructuring			(2,779	)		(2,040	)		—			—			(4,819	)

	Balance December 31, 2014		$	15,205		$	15,226		$	2,459		$	2,063		$	34,953

	2013
	Troubled debt restructuring:
	Balance, January 1, 2013		$	12,660		$	18,422		$	473		$	499		$	32,054
	(Charge-offs)/recoveries			879			1			(61	)		1			820
	Payments			(6,251	)		(5,635	)		(455	)		(57	)		(12,398	)
	Additions			15,155			9,851			1,484			1,901			28,391

	Balance December 31, 2013		$	22,443		$	22,639		$	1,441		$	2,344		$	48,867

Schedule of Activity of Purchased Impaired Loans	For these noncovered loans that meet the criteria of ASC 310-30 treatment, the carrying amount is as follows:


			December 31,
	(dollars in thousands)		2014			2013
	Commercial		$	2,770		$	648
	Commercial real estate			37,394			23,618
	Consumer			7,073			12,725
	Residential			133			154

	Outstanding balance		$	47,370		$	37,145

	Carrying amount, net of allowance		$	45,831		$	34,576

	Allowance for loan losses		$	1,539		$	2,569

Schedule of Accretable Yield of Noncovered Loans, or Income Expected to be Collected	Accretable yield of noncovered loans, or income expected to be collected, is as follows:


	(dollars in thousands)		Monroe			Integra			IBT			Tower			United			LSB			Total
	(dollars in thousands)		Monroe			Noncovered			IBT			Tower			United			LSB			Total
	Balance at January 1, 2014		$	6,787		$	2,425		$	19,079		$	—		$	—		$	—		$	28,291
	New loans purchased			—			—			—			4,065			1,605			2,604			8,274
	Accretion of income			(2,875	)		(823	)		(10,771	)		(984	)		(336	)		(195	)		(15,984	)
	Reclassifications from (to) nonaccretable difference			(1,185	)		(117	)		5,046			1,478			247			—			5,469
	Disposals/other adjustments			837			(96	)		—			—			—			—			741

	Balance at December 31, 2014		$	3,564		$	1,389		$	13,354		$	4,559		$	1,516		$	2,409		$	26,791

Schedule of Receivables for which Contractually Required Payments would not be Collected	At acquisition, purchased loans, both covered and noncovered, for which it was probable at acquisition that all contractually required payments would not be collected were as follows:


	(dollars in thousands)		Monroe			Integra			IBT			Tower			United			LSB
	(dollars in thousands)		Bancorp			Bank (1)			IBT			Tower			United			LSB
	Contractually required payments		$	94,714		$	921,856		$	118,535		$	22,746		$	15,483		$	24,493
	Nonaccretable difference			(45,157	)		(226,426	)		(53,165	)		(5,826	)		(5,487	)		(9,903	)

	Cash flows expected to be collected at acquisition			49,557			695,430			65,370			16,920			9,996			14,590
	Accretable yield			(6,971	)		(98,487	)		(11,945	)		(4,065	)		(1,605	)		(2,604	)

	Fair value of acquired loans at acquisition		$	42,586		$	596,943		$	53,425		$	12,855		$	8,391		$	11,986


	-1	Includes covered and noncovered.

Covered_Loans_Tables

Covered Loans (Tables)	12 Months Ended
Covered Loans (Tables)	Dec. 31, 2014
Text Block [Abstract]
Composition of Covered Loans by Lending Classification	The composition of covered loans by lending classification was as follows:


	At December 31, 2014
	(dollars in thousands)		Loans Accounted for			Loans excluded from			Total Covered
			Under ASC 310-30			ASC 310-30 (1)			Purchased Loans
			(Purchased Credit			(Not Purchased Credit
			Impaired)			Impaired)
	Commercial		$	7,160		$	10,007		$	17,167
	Commercial real estate			37,384			3,413			40,797
	Residential			21,106			148			21,254
	Consumer			12,507			55,983			68,490

	Covered loans			78,157			69,551			147,708
	Allowance for loan losses			(1,104	)		(2,448	)		(3,552	)

	Covered loans, net		$	77,053		$	67,103		$	144,156


	-1	Includes loans with revolving privileges which are scoped out of FASB ASC Topic 310-30 and certain loans which Old National elected to treat under the cost recovery method of accounting.
Schedule of Acquired Impaired Loans	The following table is a roll-forward of acquired impaired loans accounted for under ASC 310-30 for the years ended December 31, 2014 and 2013:


	(dollars in thousands)		Contractual			Nonaccretable			Accretable			Carrying
	(dollars in thousands)		Cash Flows (1)			Difference			Yield			Amount (2)
	2014
	Balance at January 1, 2014		$	251,042		$	(46,793	)	$	(73,211	)	$	131,038
	Principal reductions and interest payments			(109,254	)		(2,145	)		(940	)		(112,339	)
	Accretion of loan discount			—			—			61,945			61,945
	Changes in contractual and expected cash flows due to remeasurement			(9,935	)		34,692			(22,067	)		2,690
	Removals due to foreclosure or sale			(7,044	)		2,232			(1,469	)		(6,281	)

	Balance at December 31, 2014		$	124,809		$	(12,014	)	$	(35,742	)	$	77,053


	2013
	Balance at January 1, 2013		$	424,527		$	(90,996	)	$	(85,779	)	$	247,752
	Principal reductions and interest payments			(144,512	)		—			—			(144,512	)
	Accretion of loan discount			—			—			35,363			35,363
	Changes in contractual and expected cash flows due to remeasurement			(20,242	)		43,424			(21,608	)		1,574
	Removals due to foreclosure or sale			(8,731	)		779			(1,187	)		(9,139	)

	Balance at December 31, 2013		$	251,042		$	(46,793	)	$	(73,211	)	$	131,038


	-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.
Schedule of Accretable Yield, or Income Expected to be Collected	Accretable yield, or income expected to be collected on the covered loans accounted for under ASC 310-30, is as follows:


	(dollars in thousands)		2014			2013
	Balance at January 1,		$	73,211		$	85,779
	Accretion of income			(61,945	)		(35,363	)
	Reclassifications from (to) nonaccretable difference			22,067			21,608
	Disposals/other adjustments			2,409			1,187

	Balance at December 31,		$	35,742		$	73,211

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, 2014 and 2013:


	(dollars in thousands)		2014			2013
	Balance at January 1,		$	88,513		$	116,624
	Adjustments not reflected in income
	Cash received from the FDIC			(26,342	)		(19,527	)
	Other			1,594			704
	Adjustments reflected in income
	(Amortization) accretion			(41,611	)		(10,072	)
	Impairment			59			32
	Write-downs/sale of other real estate			(1,610	)		1,933
	Recovery amounts due to FDIC			—			(1,243	)
	Other			—			62

	Balance at December 31,		$	20,603		$	88,513

Other_Real_Estate_Owned_Tables

Other Real Estate Owned (Tables)	12 Months Ended
Other Real Estate Owned (Tables)	Dec. 31, 2014
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, 2014 and 2013:


	(dollars in thousands)		Other Real Estate			Other Real Estate
	(dollars in thousands)		Owned (1)			Owned, Covered
	2014
	Balance, January 1, 2014		$	7,562		$	13,670
	Additions			7,064			8,480
	Sales			(5,856	)		(11,164	)
	Gains (losses)/Write-downs			(1,529	)		(1,865	)

	Balance, December 31, 2014		$	7,241		$	9,121


	2013
	Balance, January 1, 2013		$	11,179		$	26,137
	Additions			7,278			6,368
	Sales			(9,316	)		(14,813	)
	Gains (losses)/Write-downs			(1,579	)		(4,022	)

	Balance, December 31, 2013		$	7,562		$	13,670


	-1	Includes repossessed personal property of $0.2 million at December 31, 2014 and $0.3 million at December 31, 2013.

Goodwill_and_Other_Intangible_1

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
Goodwill and Other Intangible Assets (Tables)	Dec. 31, 2014
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 by segment for the years ended December 31, 2014 and 2013:


	(dollars in thousands)	Banking		Insurance			Other		Total
	Balance, January 1, 2014	$	312,856	$	39,873		$	—	$	352,729
	Goodwill acquired during the period		178,116		—			—		178,116

	Balance, December 31, 2014	$	490,972	$	39,873		$	—	$	530,845


	Balance, January 1, 2013	$	298,947	$	39,873		$	—	$	338,820
	Goodwill acquired during the period		13,909		—			—		13,909

	Balance, December 31, 2013	$	312,856	$	39,873		$	—	$	352,729

Schedule of Gross Carrying Amount and Accumulated Amortization of Other Intangible Assets	The gross carrying amounts and accumulated amortization of other intangible assets at December 31, 2014 and 2013 was as follows:


	(dollars in thousands)	Gross Carrying		Accumulated			Net Carrying
	(dollars in thousands)	Amount		Amortization			Amount
	2014
	Amortized intangible assets:
	Core deposit	$	57,149	$	(36,950	)	$	20,199
	Customer business relationships		27,942		(21,438	)		6,504
	Customer trust relationships		13,986		(3,232	)		10,754
	Customer loan relationships		4,413		(3,176	)		1,237

	Total intangible assets	$	103,490	$	(64,796	)	$	38,694

	2013
	Amortized intangible assets:
	Core deposit	$	44,021	$	(31,266	)	$	12,755
	Customer business relationships		27,848		(19,826	)		8,022
	Customer trust relationships		5,352		(1,810	)		3,542
	Customer loan relationships		4,413		(2,775	)		1,638

	Total intangible assets	$	81,634	$	(55,677	)	$	25,957

Schedule of Estimated Amortization Expense for Future Years	Estimated amortization expense for future years is as follows:


	(dollars in thousands)
	2015	$	10,118
	2016		8,381
	2017		6,287
	2018		4,743
	2019		3,491
	Thereafter		5,674

	Total	$	38,694

Loan_Servicing_Rights_Tables

Loan Servicing Rights (Tables)	12 Months Ended
Loan Servicing Rights (Tables)	Dec. 31, 2014
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 at December 31, 2014:


	(dollars in thousands)	2014
	Balance at January 1	$	—
	Additions		10,310
	Amortization		(726	)

	Balance before valuation allowance, December 31		9,584

	Valuation allowance:		—
	Balance at January 1		—
	Additions		(50	)

	Balance, December 31		(50	)

	Loan servicing rights, net	$	9,534

Deposits_Tables

Deposits (Tables)	12 Months Ended
Deposits (Tables)	Dec. 31, 2014
Banking and Thrift [Abstract]
Schedule of Maturities of Total Time Deposits	At December 31, 2014, the scheduled maturities of total time deposits were as follows:



	(dollars in thousands)
	Due in 2015	$	601,243
	Due in 2016		257,087
	Due in 2017		98,146
	Due in 2018		59,874
	Due in 2019		46,822
	Thereafter		25,846

	Total	$	1,089,018

ShortTerm_Borrowings_Tables

Short-Term Borrowings (Tables)	12 Months Ended
Short-Term Borrowings (Tables)	Dec. 31, 2014
Debt Disclosure [Abstract]
Schedule of Short-Term Borrowings and Weighted-Average Interest Rates	The following table presents the distribution of Old National’s short-term borrowings and related weighted-average interest rates for each of the years ended December 31:


	(dollars in thousands)	Federal Funds			Repurchase			Total
		Purchased			Agreements /
					Sweeps
	2014
	Outstanding at year-end	$	195,188		$	356,121		$	551,309
	Average amount outstanding		77,512			327,407			404,919
	Maximum amount outstanding at any month-end		195,188			356,121
	Weighted average interest rate:
	During year		0.23	%		0.07	%		0.08	%
	End of year		0.17			0.05			0.09
	2013
	Outstanding at year-end	$	115,103		$	347,229		$	462,332
	Average amount outstanding		176,033			341,620			517,653
	Maximum amount outstanding at any month-end		466,861			425,191
	Weighted average interest rate:
	During year		0.22	%		0.07	%		0.12	%
	End of year		0.2			0.05			0.09

Financing_Activities_Tables

Financing Activities (Tables)	12 Months Ended
Financing Activities (Tables)	Dec. 31, 2014
Debt Disclosure [Abstract]
Other Borrowings	The following table summarizes Old National and its subsidiaries’ other borrowings at December 31:



	(dollars in thousands)	2014			2013
	Old National Bancorp:
	Senior unsecured bank notes (fixed rate 4.125%) maturing August 2024	$	175,000		$	—
	Junior subordinated debentures (variable rates 1.58% to 1.99%) maturing March 2035 to June 2037		45,000			28,000
	ASC 815 fair value hedge and other basis adjustments		(4,884	)		(3,262	)
	Old National Bank:
	Securities sold under agreements to repurchase (fixed rates 2.47% to 2.50%) maturing January 2017 to January 2018		50,000			50,000
	Federal Home Loan Bank advances (fixed rates 0.19% to 6.76% and variable rates 0.31% to 0.34%) maturing January 2015 to May 2024		649,987			477,856
	Capital lease obligation		4,099			4,157
	ASC 815 fair value hedge and other basis adjustments		900			(363	)

	Total other borrowings	$	920,102		$	556,388

Contractual Maturities of Long-Term Debt	Contractual maturities of other borrowings at December 31, 2014, were as follows:


	(dollars in thousands)
	Due in 2015	$	200,063
	Due in 2016		117,376
	Due in 2017		45,909
	Due in 2018		195,516
	Due in 2019		3,307
	Thereafter		361,915
	ASC 815 fair value hedge and other basis adjustments		(3,984	)

	Total	$	920,102

Future Minimum Lease Payments under Capital Lease	At December 31, 2014, the future minimum lease payments under the capital lease were as follows:


	(dollars in thousands)
	2015	$	410
	2016		410
	2017		410
	2018		410
	2019		429
	Thereafter		8,836

	Total minimum lease payments		10,905
	Less amounts representing interest		6,806

	Present value of net minimum lease payments	$	4,099

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
Income Taxes (Tables)	Dec. 31, 2014
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)	2014			2013			2012
	Provision at statutory rate of 35%	$	49,688		$	49,881		$	44,725
	Tax-exempt income:
	Tax-exempt interest		(11,460	)		(10,125	)		(8,590	)
	Section 291/265 interest disallowance		93			107			147
	Bank owned life insurance income		(2,423	)		(2,609	)		(2,258	)

	Tax-exempt income		(13,790	)		(12,627	)		(10,701	)

	Reserve for unrecognized tax benefits		(1,076	)		(381	)		(292	)
	State income taxes		2,676			3,386			3,409
	State statutory rate change		904			1,257			—
	Other, net		(105	)		81			(1,031	)

	Income tax expense	$	38,297		$	41,597		$	36,110

	Effective tax rate		27	%		29.2	%		28.3	%

Provision for Income Taxes	The provision for income taxes consisted of the following components for the years ended December 31:



	(dollars in thousands)	2014			2013			2012
	Income taxes currently payable:
	Federal	$	8,974		$	13,901		$	21,015
	State		581			(51	)		1,975
	Deferred income taxes related to:
	Federal		27,207			22,983			11,052
	State		1,535			4,764			2,068

	Deferred income tax expense		28,742			27,747			13,120

	Provision for income taxes	$	38,297		$	41,597		$	36,110

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)	2014			2013
	Deferred Tax Assets
	Allowance for loan losses, net of recapture	$	16,348		$	16,891
	Benefit plan accruals		16,683			15,331
	AMT credit		19,808			21,268
	Unrealized losses on benefit plans		5,648			4,011
	Net operating loss carryforwards		3,258			3,763
	Premises and equipment		20,139			24,221
	Federal tax credits		1,632			422
	Other-than-temporary-impairment		3,573			4,939
	Acquired loans		49,350			51,546
	Lease exit obligation		1,747			2,654
	Unrealized losses on available-for-sale investment securities		1,815			13,276
	Unrealized losses on held-to-maturity investment securities		8,120			8,567
	Unrealized losses on hedges		3,638			116
	Other, net		6,324			5,406

	Total deferred tax assets		158,083			172,411

	Deferred Tax Liabilities
	Accretion on investment securities		(449	)		(438	)
	Lease receivable, net		—			(395	)
	Other real estate owned		(178	)		(701	)
	Purchase accounting		(15,112	)		(7,355	)
	FDIC indemnification asset		(6,909	)		(27,938	)
	Loan servicing rights		(3,558	)		—
	Other, net		(2,530	)		(2,028	)

	Total deferred tax liabilities		(28,736	)		(38,855	)

	Net deferred tax assets	$	129,347		$	133,556

Summary of Reconciliation of Unrecognized Tax Benefits	A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:


	(dollars in thousands)	2014			2013			2012
	Balance at January 1	$	3,847		$	3,953		$	4,145
	Additions based on tax positions related to the current year		37			34			2
	Reductions due to statute of limitations expiring		(3,807	)		(140	)		(194	)

	Balance at December 31	$	77		$	3,847		$	3,953

Employee_Benefit_Plans_Tables

Employee Benefit Plans (Tables)	12 Months Ended
Employee Benefit Plans (Tables)	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Summary of Defined Benefit Plans Combined Activity	The following table presents the combined activity of our defined benefit plans:




	EMPLOYEE BENEFIT PLANS
	(dollars in thousands)	2014			2013
	Change in Projected Benefit Obligation
	Balance at January 1	$	41,321		$	48,728
	Interest cost		1,754			1,740
	Benefits paid		(931	)		(942	)
	Actuarial loss (gain)		6,287			(3,783	)
	Settlement		(1,985	)		(4,422	)

	Projected Benefit Obligation at December 31		46,446			41,321

	Change in Plan Assets
	Fair value at January 1		37,916			37,550
	Actual return on plan assets		2,260			5,320
	Employer contributions		433			410
	Benefits paid		(931	)		(942	)
	Settlement		(1,985	)		(4,422	)

	Fair value of Plan Assets at December 31		37,693			37,916

	Funded status at December 31		(8,753	)		(3,405	)

	Amounts recognized in the statement of financial position at December 31:
	Accrued benefit liability	$	(8,753	)	$	(3,405	)

	Net amount recognized	$	(8,753	)	$	(3,405	)

	Amounts recognized in accumulated other comprehensive income at December 31:
	Net actuarial loss	$	14,863		$	10,530

	Total	$	14,863		$	10,530

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)	2014			2013			2012
	Net Periodic Benefit Cost
	Interest cost	$	1,754		$	1,740		$	1,971
	Expected return on plan assets		(2,239	)		(2,202	)		(2,345	)
	Recognized actuarial loss		1,316			2,318			4,027

	Net periodic benefit cost	$	831		$	1,856		$	3,653
	Settlement cost		617			1,118			1,170

	Total net periodic benefit cost	$	1,448		$	2,974		$	4,823

	Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income
	Net actuarial (gain)/loss	$	6,266		$	(6,901	)	$	1,903
	Amortization of net actuarial loss		(1,316	)		(2,318	)		(4,027	)
	Settlement cost		(617	)		(1,118	)		(1,170	)

	Total recognized in other comprehensive income	$	4,333		$	(10,337	)	$	(3,294	)

	Total recognized in net periodic benefit cost and other comprehensive income	$	5,781		$	(7,363	)	$	1,529

Schedule of Assumptions Used in Determining the Benefit Obligations and Net Periodic Benefit Cost	The weighted-average assumptions used to determine the benefit obligations 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 plans are frozen, increases in compensation are not considered.


		2014			2013			2012
	Benefit obligations:
	Discount rate at the end of the period		4	%		4.75	%		4	%
	Net periodic benefit cost:
	Discount rate at the beginning of the period		4.75	%		4	%		4.55	%
	Expected return on plan assets		7.5			7.5			7.5
	Rate of compensation increase		N/A			N/A			N/A
Schedule of Asset Allocation of Retirement Plan	Old National’s asset allocation of the Retirement Plan as of year-end is presented in the following table. Old National’s Restoration Plan is unfunded.


	Asset Category	Expected		2014 Target	2014			2013			2012
		Long-Term		Allocation
		Rate of Return
	Equity securities	9.00% - 9.50%		40 - 70%		61	%		64	%		61	%
	Debt securities	4.00% - 5.85%		30 - 60%		38			35			38
	Cash equivalents	—		0 - 15%		1			1			1

	Total					100	%		100	%		100	%

Schedule of Pension Plan Assets at Fair Value	The fair value of our plan assets are determined based on observable Level 1 or 2 pricing inputs, including quoted prices for similar assets in active or non-active markets. The holdings of the plan are comprised of pooled separate accounts, except for one mutual fund in the Fixed Income category. As of December 31, 2014, the fair value of plan assets, by asset category, is as follows:


					Fair Value Measurements at December 31, 2014 Using
	(dollars in thousands)	Carrying			Quoted Prices in			Significant			Significant
		Value			Active Markets for			Other			Unobservable
					Identical Assets			Observable			Inputs
					(Level 1)			Inputs			(Level 3)
								(Level 2)

	Plan Assets
	Large U.S. Equity	$	15,877		$	—		$	15,877		$	—
	International Equity		7,103			—			7,103			—
	Short-Term Fixed Income		468			—			468			—
	Fixed Income		14,245			14,245			—			—

	Total Plan Assets	$	37,693		$	14,245		$	23,448		$	—

	As of December 31, 2013, the fair value of plan assets, by asset category, was as follows:


					Fair Value Measurements at December 31, 2013 Using
	(dollars in thousands)	Carrying			Quoted Prices in			Significant			Significant
		Value			Active Markets for			Other			Unobservable
					Identical Assets			Observable			Inputs
					(Level 1)			Inputs			(Level 3)
								(Level 2)

	Plan Assets
	Large U.S. Equity	$	16,245		$	—		$	16,245		$	—
	International Equity		8,120			—			8,120			—
	Short-Term Fixed Income		102			—			102			—
	Fixed Income		13,449			13,449			—			—

	Total Plan Assets	$	37,916		$	13,449		$	24,467		$	—

Schedule of Expected Benefit Payments	As of December 31, 2014, expected future benefit payments related to Old National’s defined benefit plans were as follows:


	(dollars in thousands)
	2015	$	9,830
	2016		4,390
	2017		5,060
	2018		3,060
	2019		3,760
	Years 2020 - 2024		14,330

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	12 Months Ended
Stock-Based Compensation (Tables)	Dec. 31, 2014
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)	Number			Weighted Average
		Outstanding			Grant-Date
					Fair Value
	Nonvested balance at January 1, 2014		172		$	12.44
	Granted during the year		196			14.15
	Vested during the year		(90	)		12.13
	Forfeited during the year		(2	)		13.96

	Nonvested balance at December 31, 2014		276		$	13.74

Summary of Changes in Nonvested Restricted Shares	A summary of changes in our nonvested shares for the year follows:


	(shares in thousands)	Number			Weighted Average
		Outstanding			Grant-Date
					Fair Value
	Nonvested balance at January 1, 2014		711		$	11.87
	Granted during the year		260			12.46
	Vested during the year		(174	)		12.21
	Forfeited during the year		—			—
	Reinvested dividend equivalents		22			12.28

	Nonvested balance at December 31, 2014		819		$	12.02

Summary of Activity in Stock Option Plan	A summary of the activity in the stock option plan for 2014 follows:


	(shares in thousands)	Shares			Weighted		Weighted		Aggregate
					Average		Average		Intrinsic
					Exercise		Remaining		Value
					Price		Contractual		(in thousands)
							Term in Years
	Outstanding, January 1		1,344		$	16.96
	Granted		—			—
	Acquired		431			14.84
	Exercised		(105	)		10.17
	Forfeited/expired		(208	)		20.61

	Outstanding, December 31		1,462		$	16.3		2.67	$	2,509.40

	Options exercisable at end of year		1,462		$	16.3		2.67	$	2,506.40

Schedule of Information Related to Stock Option Plan	Information related to the stock option plan during each year follows:


	(dollars in thousands)	2014			2013		2012
	Intrinsic value of options exercised	$	432		$	282	$	256
	Cash received from option exercises		1,002			1,159		716
	Tax benefit realized from option exercises		97			45		72

Fair_Value_Tables

Fair Value (Tables)	12 Months Ended
Fair Value (Tables)	Dec. 31, 2014
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, 2014 Using
	(dollars in thousands)		Carrying				Quoted Prices in				Significant				Significant
			Value				Active Markets for				Other				Unobservable
							Identical Assets				Observable				Inputs
							(Level 1)				Inputs				(Level 3)
											(Level 2)

	Financial Assets
	Trading securities		$	3,881			$	3,881			$	—			$	—
	Investment securities available-for-sale:
	U.S. Treasury			15,166				15,166				—				—
	U.S. Government-sponsored entities and agencies			685,951				—				685,951				—
	Mortgage-backed securities - Agency			1,241,662				—				1,241,662				—
	States and political subdivisions			314,541				—				314,216				325
	Pooled trust preferred securities			6,607				—				—				6,607
	Other securities			393,745				31,648				362,097				—
	Residential loans held for sale			15,562				—				15,562				—
	Derivative assets			18,572				—				18,572				—
	Financial Liabilities
	Derivative liabilities			23,868				—				23,868				—


							Fair Value Measurements at December 31, 2013 Using
	(dollars in thousands)		Carrying				Quoted Prices in				Significant				Significant
			Value				Active Markets for				Other				Unobservable
							Identical Assets				Observable				Inputs
							(Level 1)				Inputs				(Level 3)
											(Level 2)

	Financial Assets
	Trading securities		$	3,566			$	3,566			$	—			$	—
	Investment securities available-for-sale:
	U.S. Treasury			13,113				13,113				—				—
	U.S. Government-sponsored entities and agencies			435,588				—				435,588				—
	Mortgage-backed securities - Agency			1,289,258				—				1,289,258				—
	Mortgage-backed securities - Non-agency			17,412				—				17,412				—
	States and political subdivisions			268,795				—				268,126				669
	Pooled trust preferred securities			8,037				—				—				8,037
	Other securities			339,998				31,254				308,744				—
	Residential loans held for sale			7,705				—				7,705				—
	Derivative assets			22,087				—				22,087				—
	Financial Liabilities
	Derivative liabilities			19,723				—				19,723				—
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, 2014:


			Fair Value Measurements using
			Significant Unobservable Inputs
			(Level 3)
	(dollars in thousands)		Pooled Trust Preferred				State and
			Securities Available-				Political
			for-Sale				Subdivisions
	Beginning balance, January 1, 2014		$	8,037			$	669
	Accretion/(amortization) of discount or premium			18				2
	Sales/payments received			(1,118	)			(11	)
	Matured securities			—				(335	)
	Increase/(decrease) in fair value of securities			(330	)			—

	Ending balance, December 31, 2014		$	6,607			$	325

	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, 2013:


			Fair Value Measurements using
			Significant Unobservable Inputs
			(Level 3)
	(dollars in thousands)		Pooled Trust Preferred				State and
			Securities Available-				Political
			for-Sale				Subdivisions
	Beginning balance, January 1, 2013		$	9,359			$	984
	Accretion/(amortization) of discount or premium			17				5
	Sales/payments received			(2,929	)			—
	Matured securities			—				(320	)
	Credit loss write-downs			(1,000	)			—
	Increase/(decrease) in fair value of securities			2,590				—

	Ending balance, December 31, 2013		$	8,037			$	669

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:



			Quantitative Information about Level 3 Fair Value Measurements
	(dollars in thousands)		Fair Value at				Valuation		Unobservable		Range (Weighted
			Dec. 31, 2014								Average)
							Techniques		Input
	Pooled trust preferred securities		$	6,607			Discounted cash flow		Constant prepayment rate (a)		0.00%
									Additional asset defaults (b)		4.4% – 11.2% (8.2%)
									Expected asset recoveries (c)		0.7% – 7.0% (1.8%)

	State and political subdivision securities			325			Discounted cash flow		No unobservable inputs		N/A
									Illiquid local municipality issuance
									Old National owns 100%
									Carried at par


	(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%.



			Quantitative Information about Level 3 Fair Value Measurements
	(dollars in thousands)		Fair Value at				Valuation		Unobservable		Range (Weighted
			Dec. 31, 2013								Average)
							Techniques		Input
	Pooled trust preferred securities		$	8,037			Discounted cash flow		Constant prepayment rate (a)		0.00%
									Additional asset defaults (b)		1.9% – 9.6% (4.5%)
									Expected asset recoveries (c)		1.7% – 9.6% (3.2%)

	State and political subdivision securities			669			Discounted cash flow		No unobservable inputs		N/A
									Illiquid local municipality issuance
									Old National owns 100%
									Carried at par


	(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:



			Quantitative Information about Level 3 Fair Value Measurements
	(dollars in thousands)		Fair Value at				Valuation		Unobservable		Range (Weighted
			Dec. 31, 2014				Techniques				Average)
									Input
	Collateral Dependent Impaired Loans
	Commercial loans		$	6,816			Fair value of collateral		Discount for type of property, age of appraisal and current status		0% - 94% (24%)

	Commercial real estate loans			13,011			Fair value of collateral		Discount for type of property, age of appraisal and current status		0% - 50% (29%)

	Foreclosed Assets
	Commercial real estate			6,146			Fair value of collateral		Discount for type of property, age of appraisal and current status		2% - 93% (30%)

	Residential			254			Fair value of collateral		Discount for type of property, age of appraisal and current status		8% - 81% (45%)

			Quantitative Information about Level 3 Fair Value Measurements
	(dollars in thousands)		Fair Value at				Valuation		Unobservable		Range (Weighted
Dec. 31, 2013			Techniques				Average)
				Input
Collateral Dependent Impaired Loans
Commercial loans			$	9,224			Fair value of collateral		Discount for type of property, age of appraisal and current status		0% - 75% (24%)

Commercial real estate loans			7,851			Fair value of collateral		Discount for type of property, age of appraisal and current status		10% - 54% (30%)

Foreclosed Assets
Commercial real estate			9,069			Fair value of collateral		Discount for type of property, age of appraisal and current status		10% - 40% (25%)

Residential			283			Fair value of collateral		Discount for type of property, age of appraisal and current status		10% - 45% (25%)
Assets Measured at Fair Value on a Non-Recurring Basis	Assets measured at fair value on a non-recurring basis are summarized below:



							Fair Value Measurements at December 31, 2014 Using
	(dollars in thousands)		Carrying				Quoted Prices in				Significant				Significant
			Value				Active Markets for				Other				Unobservable
							Identical Assets				Observable				Inputs
							(Level 1)				Inputs				(Level 3)
											(Level 2)
	Collateral Dependent Impaired Loans
	Commercial loans		$	6,816			$	—			$	—			$	6,816
	Commercial real estate loans			13,011				—				—				13,011
	Foreclosed Assets
	Commercial real estate			6,146				—				—				6,146
	Residential			254				—				—				254


							Fair Value Measurements at December 31, 2013 Using
	(dollars in thousands)		Carrying				Quoted Prices in				Significant				Significant
			Value				Active Markets for				Other				Unobservable
							Identical Assets				Observable				Inputs
							(Level 1)				Inputs				(Level 3)
											(Level 2)
	Collateral Dependent Impaired Loans
	Commercial loans		$	9,224			$	—			$	—			$	9,224
	Commercial real estate loans			7,851				—				—				7,851
	Foreclosed Assets
	Commercial real estate			9,069				—				—				9,069
	Residential			283				—				—				283
Schedule of Difference Between the Aggregate Fair Value and the Aggregate Remaining Principal Balance	As of December 31, 2014, the difference between the aggregate fair value and the aggregate remaining principal balance for loans for which the fair value option has been elected is as follows:


	(dollars in thousands)		Aggregate				Difference				Contractual
	(dollars in thousands)		Fair Value				Difference				Principal
	Residential loans held for sale		$	15,562			$	375			$	15,187
	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 year ended December 31, 2014:


	Changes in Fair Value for the Year ended December 31, 2014, for Items
	Measured at Fair Value Pursuant to Election of the Fair Value Option
	(dollars in thousands)		Other				Interest				Interest				Total Changes
			Gains and				Income				(Expense)				in Fair Values
			(Losses)												Included in
															Current Period
															Earnings
	Residential loans held for sale		$	247			$	—			$	—			$	247
	As of December 31, 2013, the difference between the aggregate fair value and the aggregate remaining principal balance for loans for which the fair value option has been elected was as follows:


	(dollars in thousands)		Aggregate				Difference				Contractual
	(dollars in thousands)		Fair Value				Difference				Principal
	Residential loans held for sale		$	7,705			$	128			$	7,577
	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 year ended December 31, 2013:


	Changes in Fair Value for the Year ended December 31, 2013, for Items
	Measured at Fair Value Pursuant to Election of the Fair Value Option
	(dollars in thousands)		Other				Interest				Interest				Total Changes
			Gains and				Income				(Expense)				in Fair Values
			(Losses)												Included in
															Current Period
															Earnings
	Residential loans held for sale		$	(224	)		$	—			$	(2	)		$	(226	)
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, 2014 and 2013, respectively, are as follows:



							Fair Value Measurements at December 31, 2014 Using
	(dollars in thousands)		Carrying				Quoted Prices in				Significant				Significant
			Value				Active Markets for				Other				Unobservable
							Identical Assets				Observable				Inputs
							(Level 1)				Inputs				(Level 3)
											(Level 2)
	Financial Assets
	Cash, due from banks, federal funds sold and money market investments		$	239,963			$	239,963			$	—			$	—
	Investment securities held-to-maturity:
	U.S. Government-sponsored entities and agencies			167,207				—				173,486				—
	Mortgage-backed securities – Agency			23,648				—				24,574				—
	State and political subdivisions			653,199				—				705,875				—
	Federal Home Loan Bank stock			41,334				—				41,334				—
	Loans held for sale (a)			197,928				—				197,928				—
	Loans, net (including covered loans):
	Commercial			1,626,097				—				—				1,646,144
	Commercial real estate			1,734,559				—				—				1,744,126
	Residential real estate			1,537,448				—				—				1,615,588
	Consumer credit			1,372,248				—				—				1,380,835
	FDIC indemnification asset			20,603				—				—				11,358
	Accrued interest receivable			60,966				29				21,633				39,304
	Loan servicing rights			9,534				—				9,534				—

	Financial Liabilities
	Deposits:
	Noninterest-bearing demand deposits		$	2,427,748			$	2,427,748			$	—			$	—
	NOW, savings and money market deposits			4,973,898				4,973,898				—				—
	Time deposits			1,089,018				—				1,092,969				—
	Short-term borrowings:
	Federal funds purchased			195,188				195,188				—				—
	Repurchase agreements			356,121				356,120				—				—
	Other borrowings:
	Senior unsecured bank notes			175,000				—				179,792				—
	Junior subordinated debentures			45,000				—				32,754				—
	Repurchase agreements			50,000				—				51,994				—
	Federal Home Loan Bank advances			649,987				—								658,506
	Capital lease obligation			4,099				—				5,515				—
	Accrued interest payable			4,564				—				4,564				—
	Standby letters of credit			358				—				—				358

	Off-Balance Sheet Financial Instruments
	Commitments to extend credit		$	—			$	—			$	—			$	2,030



							Fair Value Measurements at December 31, 2013 Using
	(dollars in thousands)		Carrying				Quoted Prices in				Significant				Significant
			Value				Active Markets for				Other				Unobservable
							Identical Assets				Observable				Inputs
							(Level 1)				Inputs				(Level 3)
											(Level 2)
	Financial Assets
	Cash, due from banks, federal funds sold and money market investments		$	206,723			$	206,723			$	—			$	—
	Investment securities held-to-maturity:
	U.S. Government-sponsored entities and agencies			170,621				—				178,370				—
	Mortgage-backed securities – Agency			35,443				—				36,348				—
	State and political subdivisions			556,670				—				566,040				—
	Federal Home Loan Bank stock			40,584				—				40,584				—
	Loans, net (including covered loans):
	Commercial			1,386,185				—				—				1,414,184
Commercial real estate			1,220,417				—				—				1,273,070
Residential real estate			1,384,183				—				—				1,475,710
Consumer credit			1,045,034				—				—				1,058,021
FDIC indemnification asset			88,513				—				—				55,368
Accrued interest receivable			50,205				42				20,708				29,455

Financial Liabilities
Deposits:
Noninterest-bearing demand deposits		$	2,026,490			$	2,026,490			$	—			$	—
NOW, savings and money market deposits			4,166,438				4,166,438				—				—
Time deposits			1,017,975				—				1,028,043				—
Short-term borrowings:
Federal funds purchased			115,103				115,103				—				—
Repurchase agreements			347,229				347,226				—				—
Other borrowings:
Junior subordinated debentures			28,000				—				17,605				—
Repurchase agreements			50,000				—				52,633				—
Federal Home Loan Bank advances			447,856				—				—				485,759
Capital lease obligation			4,157				—				5,245				—
Accrued interest payable			1,877				—				1,877				—
Standby letters of credit			380				—				—				380

Off-Balance Sheet Financial Instruments
Commitments to extend credit		$	—			$	—			$	—			$	1,648

Derivative_Financial_Instrumen1

Derivative Financial Instruments (Tables)	12 Months Ended
Derivative Financial Instruments (Tables)	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Fair Value of Derivative Financial Instruments	The following tables summarize the fair value of derivative financial instruments utilized by Old National:


			Asset Derivatives
			December 31, 2014			December 31, 2013
	(dollars in thousands)		Balance	Fair		Balance		Fair
			Sheet	Value		Sheet		Value
			Location			Location
	Derivatives designated as hedging instruments
	Interest rate contracts		Other assets	$	4,278	Other assets		$	3,545

	Total derivatives designated as hedging instruments			$	4,278			$	3,545

	Derivatives not designated as hedging instruments
	Interest rate contracts		Other assets	$	13,780	Other assets		$	18,279
	Mortgage contracts		Other assets		514	Other assets			263

	Total derivatives not designated as hedging instruments			$	14,294			$	18,542

	Total derivatives			$	18,572			$	22,087


			Liability Derivatives
			December 31, 2014			December 31, 2013
	(dollars in thousands)		Balance	Fair		Balance		Fair
			Sheet	Value		Sheet		Value
			Location			Location
	Derivatives designated as hedging instruments
	Interest rate contracts		Other liabilities	$	9,951	Other liabilities		$	1,218

	Total derivatives designated as hedging instruments			$	9,951			$	1,218

	Derivatives not designated as hedging instruments
	Interest rate contracts		Other liabilities	$	13,917	Other liabilities		$	18,505

	Total derivatives not designated as hedging instruments			$	13,917			$	18,505

	Total derivatives			$	23,868			$	19,723

Schedule of Effect of Derivative Instruments on the Consolidated Statements of Income	The effect of derivative instruments on the consolidated statement of income were as follows for the years ended December 31:



	(dollars in thousands)			2014		2013				2012
	Derivatives in		Location of Gain or (Loss)	Amount of Gain or (Loss)
			Recognized in Income on	Recognized in Income on
	Fair Value Hedging		Derivative	Derivative

	Relationships
	Interest rate contracts (1)		Interest income / (expense)	$	1,002	$	1,748			$	2,114
	Interest rate contracts (2)		Other income / (expense)		275		(33	)			677

	Total			$	1,277	$	1,715			$	2,791


	Derivatives in		Location of Gain or (Loss)	Amount of Gain or (Loss)
			Recognized in Income on	Recognized in Income on
	Cash Flow Hedging		Derivative	Derivative

	Relationships
	Interest rate contracts (1)		Interest income / (expense)	$	—	$	—			$	241

	Total			$	—	$	—			$	241


	Derivatives Not Designated as		Location of Gain or (Loss)	Amount of Gain or (Loss)
			Recognized in Income on	Recognized in Income on
	Hedging Instruments		Derivative	Derivative
	Interest rate contracts (3)		Other income / (expense)	$	88	$	209			$	143
	Mortgage contracts		Mortgage banking revenue		252		(215	)			261

	Total			$	340	$	(6	)		$	404



	-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 (Tables)	12 Months Ended
Commitments and Contingencies (Tables)	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Summary of Future Minimum Lease Commitments	The following is a summary of future minimum lease commitments as of December 31, 2014:


	(dollars in thousands)
	2015	$	32,338
	2016		31,078
	2017		30,690
	2018		29,281
	2019		27,505
	Thereafter		229,452

	Total	$	380,344

Regulatory_Restrictions_Tables

Regulatory Restrictions (Tables)	12 Months Ended
Regulatory Restrictions (Tables)	Dec. 31, 2014
Text Block [Abstract]
Schedule of Capital Ratios	The following table summarizes capital ratios for Old National and Old National Bank as of December 31:


		Actual					For Capital					For Well
		Actual					Adequacy Purposes					Capitalized Purposes
	(dollars in thousands)	Amount		Ratio			Amount		Ratio			Amount		Ratio
	2014
	Total capital to risk-weighted assets
	Old National Bancorp	$	996,929		13.59	%	$	586,722		8	%	$	N/A		N/A	%
	Old National Bank		949,596		13.02			583,266		8			729,082		10
	Tier 1 capital to risk-weighted assets
	Old National Bancorp		944,649		12.88			293,361		4			N/A		N/A
	Old National Bank		897,316		12.31			291,633		4			437,449		6
	Tier 1 capital to average assets
	Old National Bancorp		944,649		8.79			429,935		4			N/A		N/A
	Old National Bank		897,316		8.41			426,873		4			533,591		5
	2013
	Total capital to risk-weighted assets
	Old National Bancorp	$	871,076		15.19	%	$	458,717		8	%	$	N/A		N/A	%
	Old National Bank		720,313		12.67			454,685		8			568,356		10
	Tier 1 capital to risk-weighted assets
	Old National Bancorp		821,281		14.32			229,358		4			N/A		N/A
	Old National Bank		670,518		11.8			227,342		4			341,014		6
	Tier 1 capital to average assets
	Old National Bancorp		821,281		8.92			368,092		4			N/A		N/A
	Old National Bank		670,518		7.35			364,793		4			455,992		5

Parent_Company_Financial_State1

Parent Company Financial Statements (Tables)	12 Months Ended
Parent Company Financial Statements (Tables)	Dec. 31, 2014
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Balance Sheet
	OLD NATIONAL BANCORP (PARENT COMPANY ONLY)

	CONDENSED BALANCE SHEETS
		December 31,
	(dollars in thousands)	2014			2013
	Assets
	Deposits in affiliate bank	$	168,467		$	75,637
	Trading securities – at fair value		3,881			3,566
	Investment securities – available-for-sale		1,338			2,025
	Investment in affiliates:
	Banking subsidiaries		1,398,835			989,585
	Non-banks		49,284			42,706
	Other assets		91,064			103,423

	Total assets	$	1,712,869		$	1,216,942

	Liabilities and Shareholders’ Equity
	Other liabilities	$	31,989		$	29,564
	Other borrowings		215,116			24,738
	Shareholders’ equity		1,465,764			1,162,640

	Total liabilities and shareholders’ equity	$	1,712,869		$	1,216,942



Statement of Income

	OLD NATIONAL BANCORP (PARENT COMPANY ONLY)

	CONDENSED STATEMENTS OF INCOME
		Years Ended December 31,
	(dollars in thousands)	2014			2013			2012
	Income
	Dividends from affiliates	$	65,292		$	116,073		$	53,042
	Net securities gains		170			416			165
	Other income		1,554			1,864			1,710
	Other income from affiliates		79			138			153

	Total income		67,095			118,491			55,070

	Expense
	Interest on borrowings		3,837			624			786
	Other expenses		11,357			11,228			14,270

	Total expense		15,194			11,852			15,056

	Income before income taxes and equity in undistributed earnings of affiliates		51,901			106,639			40,014
	Income tax benefit		(4,020	)		(4,044	)		(5,909	)

	Income before equity in undistributed earnings of affiliates		55,921			110,683			45,923
	Equity in undistributed earnings of affiliates		47,746			(9,763	)		45,752

	Net income	$	103,667		$	100,920		$	91,675



Statement of Cash Flows

	OLD NATIONAL BANCORP (PARENT COMPANY ONLY)

	CONDENSED STATEMENT OF CASH FLOWS
		Years Ended December 31,
	(dollars in thousands)	2014			2013			2012
	Cash Flows From Operating Activities
	Net income	$	103,667		$	100,920		$	91,675

	Adjustments to reconcile net income to cash provided by operating activities:
	Depreciation		11			8			15
	Net securities gains		(270	)		(416	)		(134	)
	Stock compensation expense		4,162			3,958			3,317
	(Increase) decrease in other assets		18,540			(17,972	)		9,056
	Increase (decrease) in other liabilities		286			3,095			(496	)
	Equity in undistributed earnings of affiliates		(47,746	)		9,763			(45,752	)

	Total adjustments		(25,017	)		(1,564	)		(33,994	)

	Net cash flows provided by operating activities		78,650			99,356			57,681

	Cash Flows From Investing Activities
	Net cash and cash equivalents of acquisitions		(82,975	)		—			1
	Purchases of investment securities		(45	)		(53	)		(147	)
	Net advances to affiliates		(3,832	)		—			—
	Purchases of premises and equipment		(1,032	)		(60	)		(173	)

	Net cash flows used in investing activities		(87,884	)		(113	)		(319	)

	Cash Flows From Financing Activities
	Payments related to retirement of debt		—			—			(16,000	)
	Proceeds from issuance of other borrowings		175,000			—			—
	Cash dividends paid on common stock		(48,181	)		(40,278	)		(34,657	)
	Common stock repurchased		(25,830	)		(24,292	)		(3,990	)
	Proceeds from exercise of stock options, including tax benefit		749			1,412			717
	Common stock issued		326			290			254

	Net cash flows provided by (used in) financing activities		102,064			(62,868	)		(53,676	)

	Net increase in cash and cash equivalents		92,830			36,375			3,686
	Cash and cash equivalents at beginning of period		75,637			39,262			35,576

	Cash and cash equivalents at end of period	$	168,467		$	75,637		$	39,262

Segment_Information_Tables

Segment Information (Tables)	12 Months Ended
Segment Information (Tables)	Dec. 31, 2014
Segment Reporting [Abstract]
Schedule of Financial Information Concerning Segments	Selected business segment financial information as of and for the years ended December 31, 2014, 2013 and 2012 were as follows:



	SEGMENT INFORMATION
	(dollars in thousands)	Banking			Insurance		Other			Total
	2014
	Net interest income	$	370,132		$	11	$	(3,773	)	$	366,370
	Noninterest income		121,624			41,314		2,191			165,129
	Noncash items:
	Depreciation and software amortization		13,950			138		551			14,639
	Provision for loan losses		3,097			—		—			3,097
	Amortization of intangibles		7,507			1,613		—			9,120
	Income tax expense (benefit)		41,056			1,381		(4,140	)		38,297
	Segment profit		109,776			2,428		(8,537	)		103,667
	Segment assets		11,500,974			62,537		84,040			11,647,551

	2013
	Net interest income	$	317,913		$	15	$	(504	)	$	317,424
	Noninterest income		143,953			38,657		2,148			184,758
	Noncash items:
	Depreciation and software amortization		12,082			142		299			12,523
	Provision for loan losses		(2,319	)		—		—			(2,319	)
	Amortization of intangibles		6,489			1,673		—			8,162
	Income tax expense (benefit)		44,489			1,052		(3,944	)		41,597
	Segment profit		104,265			1,925		(5,270	)		100,920
	Segment assets		9,446,349			65,328		70,067			9,581,744

	2012
	Net interest income	$	309,321		$	21	$	(585	)	$	308,757
	Noninterest income		151,410			36,732		1,674			189,816
	Noncash items:
	Depreciation and software amortization		11,869			271		964			13,104
	Provision for loan losses		5,030			—		—			5,030
	Amortization of intangibles		6,100			1,841		—			7,941
	Income tax expense (benefit)		40,569			1,397		(5,856	)		36,110
	Segment profit		96,882			1,755		(6,962	)		91,675
	Segment assets		9,413,281			62,956		67,386			9,543,623

Interim_Financial_Data_Unaudit1

Interim Financial Data (Unaudited) (Tables)	12 Months Ended
Interim Financial Data (Unaudited) (Tables)	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Interim Financial Data	The following table details the quarterly results of operations for the years ended December 31, 2014 and 2013.



	INTERIM FINANCIAL DATA
	(unaudited, dollars	Quarters Ended 2014									Quarters Ended 2013
	and shares in thousands,	December 31		September 30		30-Jun			31-Mar		December 31		September 30			30-Jun			31-Mar

	except per share data)
	Interest income	$	97,318	$	114,618	$	89,528		$	88,265	$	86,132	$	83,894		$	85,682		$	86,102
	Interest expense		7,275		6,251		5,046			4,787		4,945		5,898			6,491			7,052

	Net interest income		90,043		108,367		84,482			83,478		81,187		77,996			79,191			79,050
	Provision for loan losses		869		2,591		(400	)		37		2,253		(1,724	)		(3,693	)		845
	Noninterest income		50,495		34,418		39,653			40,563		44,444		47,755			46,244			46,315
	Noninterest expense		100,117		99,965		98,104			88,252		88,227		96,658			86,916			90,183

	Income before income taxes		39,552		40,229		26,431			35,752		35,151		30,817			42,212			34,337
	Income tax expense		10,302		11,095		7,658			9,242		10,602		6,869			13,734			10,392

	Net income	$	29,250	$	29,134	$	18,773		$	26,510	$	24,549	$	23,948		$	28,478		$	23,945

	Net income per share:
	Basic	$	0.25	$	0.26	$	0.18		$	0.27	$	0.24	$	0.24		$	0.28		$	0.24
	Diluted		0.25		0.26		0.18			0.26		0.25		0.23			0.28			0.24

	Average shares:
	Basic		115,924		111,428		103,904			99,797		100,153		100,645			100,981			101,081
	Diluted		116,592		111,947		104,361			100,325		100,718		101,131			101,352			101,547

Basis_of_Presentation_and_Sign3

Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) (USD $)

3 Months Ended

12 Months Ended

0 Months Ended

1 Months Ended

0 Months Ended

Share data in Millions, unless otherwise specified

Dec. 31, 2014

Sep. 30, 2014

Jun. 30, 2014

Mar. 31, 2014

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Apr. 25, 2014

Jul. 31, 2014

Nov. 01, 2014

Sep. 15, 2012

Basis Of Presentation And Significant Accounting Policies [Line Items]

Number of days past due for a loan be placed on nonaccrual status

90 days

Number of months required for current loans to return to accrual status

6 months

Maximum value of small commercial loans on nonaccrual status or 90 days delinquent

$250,000

Days delinquent required for charge off

90 days

Historical loss experience, number of relevant years

3 years

Company-owned life insurance

325,617,000

275,121,000

325,617,000

275,121,000

Amount of foreclosed assets

16,400,000

21,200,000

16,400,000

21,200,000

Covered other real estate owned from acquisition

9,121,000

13,670,000

9,121,000

13,670,000

Accrued interest coverage by FDIC, number of days

90 days

Percentage covered up to $467.2 million

0.00%

Number of years for loss sharing provisions for commercial mortgage loans

5 years

Number of years for loss sharing provisions for single family residential mortgage loans

10 years

Number of years for loss recovery provisions for commercial mortgage loans

8 years

Number of years for loss recovery provisions for single family residential mortgage loans

10 years

Date of acquisition

7/29/11

Carrying value of the indemnification asset

20,603,000

88,513,000

20,603,000

88,513,000

116,624,000

Tax benefit recorded

10,302,000

11,095,000

7,658,000

9,242,000

10,602,000

6,869,000

13,734,000

10,392,000

38,297,000

41,597,000

36,110,000

Percentage of income tax examination likelihood of tax benefits

50.00%

Cash paid for interest

21,000,000

25,800,000

38,400,000

Cash paid for income taxes

18,800,000

11,800,000

24,200,000

Loans transferred to loans held-for-sale

197,900,000

102,800,000

1,700,000

Transfer of premises and equipment to assets held-for-sale

3,000,000

Transfer of portfolio leases from held-for-sale

11,600,000

Transfer of securities from available-for-sale to held-to-maturity portfolio

357,800,000

Transfer of securities from held-to-maturity portfolio to available-for-sale portfolio

46,100,000

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] | Other Intangible Assets [Member]

Basis Of Presentation And Significant Accounting Policies [Line Items]

Finite-lived intangible asset, useful life

7 years

Maximum [Member]

Basis Of Presentation And Significant Accounting Policies [Line Items]

Maximum value of small commercial loans on nonaccrual status or 90 days delinquent

250,000

Maturity of short-term securities sold under agreements to repurchase

4 days

Maximum [Member] | Other Intangible Assets [Member]

Basis Of Presentation And Significant Accounting Policies [Line Items]

Finite-lived intangible asset, useful life

25 years

Losses up to $275.0 [Member]

Basis Of Presentation And Significant Accounting Policies [Line Items]

Loss sharing reimbursement threshold

80.00%

Loss amount covered at 80% up to $275 million

275,000,000

Losses in Excess of $467.2 [Member]

Basis Of Presentation And Significant Accounting Policies [Line Items]

Loss sharing reimbursement threshold

80.00%

Loss amount covered at 80% up to $275 million

467,200,000

Integra Bank N.A. [Member]

Basis Of Presentation And Significant Accounting Policies [Line Items]

Covered other real estate owned from acquisition

9,100,000

13,700,000

9,100,000

13,700,000

Tower Financial Corporation [Member]

Basis Of Presentation And Significant Accounting Policies [Line Items]

Issuance of common stock shares for acquisitions of business

5.6

Value of shares issued in acquisition

78,700,000

United Bancorp, Inc. [Member]

Basis Of Presentation And Significant Accounting Policies [Line Items]

Issuance of common stock shares for acquisitions of business

9.1

Value of shares issued in acquisition

123,800,000

LSB Financial Corp. [Member]

Basis Of Presentation And Significant Accounting Policies [Line Items]

Issuance of common stock shares for acquisitions of business

3.6

Value of shares issued in acquisition

51,800,000

Indiana Community Bancorp [Member]

Basis Of Presentation And Significant Accounting Policies [Line Items]

Issuance of common stock shares for acquisitions of business

6.6

Value of shares issued in acquisition

$88,500,000

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

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

Furniture and Equipment [Member] | Minimum [Member]

Basis Of Presentation And Significant Accounting Policies [Line Items]

Useful lives for premises and equipment, years

3 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

Basis_of_Presentation_and_Sign4

Basis of Presentation and Significant Accounting Policies - Summary of Table Reconciling Basic and Diluted Net Income Per Share (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Net income	$29,250	$29,134	$18,773	$26,510	$24,549	$23,948	$28,478	$23,945	$103,667	$100,920	$91,675
Basic Earnings Per Share, Weighted average common shares outstanding									107,818	100,712	96,440
Basic earnings per share	$0.25	$0.26	$0.18	$0.27	$0.24	$0.24	$0.28	$0.24	$0.96	$1	$0.95
Net income	$29,250	$29,134	$18,773	$26,510	$24,549	$23,948	$28,478	$23,945	$103,667	$100,920	$91,675
Diluted Earnings Per Share, Weighted average common shares outstanding									107,818	100,712	96,440
Effect of dilutive securities: Restricted stock									488	455	379
Effect of dilutive securities: Stock options									59	31	14
Diluted Earnings Per Share, Weighted average shares outstanding	116,592	111,947	104,361	100,325	100,718	101,131	101,352	101,547	108,365	101,198	96,833
Diluted earnings per share	$0.25	$0.26	$0.18	$0.26	$0.25	$0.23	$0.28	$0.24	$0.95	$1	$0.95

Basis_of_Presentation_and_Sign5

Basis of Presentation and Significant Accounting Policies - Summary of Table Reconciling Basic and Diluted Net Income Per Share (Parenthetical) (Detail)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
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	0	0	6
Equity Option [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	976	1,007	3,284

Acquisition_and_Divestiture_Ac2

Acquisition and Divestiture Activity - Additional Information (Detail) (USD $)	3 Months Ended								12 Months Ended			0 Months Ended		1 Months Ended	0 Months Ended
Share data in Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jul. 12, 2013	Apr. 25, 2014	Jul. 31, 2014	Nov. 01, 2014
	FinancialCenters								Branch	Branch		Branch
									FinancialCenters	BankingCenters
Business Acquisition [Line Items]
Number of branch locations	195								195
Net income	$29,250,000	$29,134,000	$18,773,000	$26,510,000	$24,549,000	$23,948,000	$28,478,000	$23,945,000	$103,667,000	$100,920,000	$91,675,000
Number of banking centers										12
Deposits to be included in transaction									620,000,000	178,200,000
Deposit premium										2,900,000
Number of banking centers consolidated									19	23
Loans held for sale	197,900,000								197,900,000
Southern Illinois Franchise [Member]
Business Acquisition [Line Items]
Number of banking centers									12
Eastern Indiana [Member]
Business Acquisition [Line Items]
Number of banking centers									4
Ohio [Member]
Business Acquisition [Line Items]
Number of banking centers									1
Bank of America [Member]
Business Acquisition [Line Items]
Number of branch locations												24
Percentage of deposit premium									2.94%
Net tangible assets acquired			16,097,000
Bank of America [Member] \| Community Banking [Member] \| Core Deposit Intangible [Member]
Business Acquisition [Line Items]
Definite-lived intangible assets acquired									3,500,000
Estimated useful life of acquired identifiable intangible assets									7 years
Bank of America [Member] \| Northern Indiana [Member]
Business Acquisition [Line Items]
Number of branch locations												4
Bank of America [Member] \| Southwest Michigan [Member]
Business Acquisition [Line Items]
Number of branch locations												20
Tower Financial Corporation [Member]
Business Acquisition [Line Items]
Definite-lived intangible assets acquired									8,400,000
Additional assets under management													556,000,000
Number of branch locations													7
Total purchase price of acquisition	110,400,000								110,400,000
Purchase price of acquisition, cash									31,700,000
Issuance of common stock shares for acquisitions of business									5.6				5.6
Options and stock appreciation rights, value	78,700,000								78,700,000				78,700,000
Acquisition-related costs incurred									5,600,000
Net tangible assets acquired	45,786,000								45,786,000
Tower Financial Corporation [Member] \| Core Deposit Intangible [Member]
Business Acquisition [Line Items]
Definite-lived intangible assets acquired									4,600,000
Estimated useful life of acquired identifiable intangible assets									7 years
United Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Definite-lived intangible assets acquired									10,800,000
Additional assets under management			688,000,000
Total purchase price of acquisition	157,800,000								157,800,000
Purchase price of acquisition, cash									34,000,000
Issuance of common stock shares for acquisitions of business									9.1					9.1
Options and stock appreciation rights, value														123,800,000
Acquisition-related costs incurred									7,500,000
Net tangible assets acquired	56,058,000								56,058,000
Loan servicing right	8,983,000								8,983,000
United Bancorp, Inc. [Member] \| Core Deposit Intangible [Member]
Business Acquisition [Line Items]
Definite-lived intangible assets acquired									5,900,000
Estimated useful life of acquired identifiable intangible assets									7 years
United Bancorp, Inc. [Member] \| Common Stock [Member]
Business Acquisition [Line Items]
Options and stock appreciation rights, value	122,000,000								122,000,000
United Bancorp, Inc. [Member] \| Options And Stock Appreciation Rights [Member]
Business Acquisition [Line Items]
Options and stock appreciation rights, value	1,800,000								1,800,000
United Bancorp, Inc. [Member] \| Michigan [Member]
Business Acquisition [Line Items]
Number of branch locations			18											36
LSB Financial Corp. [Member]
Business Acquisition [Line Items]
Definite-lived intangible assets acquired									2,618,000
Total purchase price of acquisition	69,600,000								69,600,000
Purchase price of acquisition, cash									17,800,000
Issuance of common stock shares for acquisitions of business									3.6						3.6
Options and stock appreciation rights, value															51,800,000
Acquisition-related costs incurred									1,800,000
Net tangible assets acquired	26,027,000								26,027,000
Loan servicing right	990,000								990,000
LSB Financial Corp. [Member] \| Common Stock [Member]
Business Acquisition [Line Items]
Options and stock appreciation rights, value	51,800,000								51,800,000
LSB Financial Corp. [Member] \| Community Banking [Member] \| Core Deposit Intangible [Member]
Business Acquisition [Line Items]
Estimated useful life of acquired identifiable intangible assets									7 years
Grand Rapids and Founders Financial Corporation [Member]
Business Acquisition [Line Items]
Options and stock appreciation rights, value	91,700,000								91,700,000
Number of banking centers									4
Amount of assets acquired	459,900,000								459,900,000
Amount of liabilities acquired	376,100,000								376,100,000
Portion of share received by merged entity	3.25								3.25
Consideration received in cash by merged entity	$38								$38
Business acquisition share price	$14.88								$14.88
Tower, United and LSB Acquisitions [Member]
Business Acquisition [Line Items]
Acquisition-related costs incurred									14,900,000
Revenue									48,100,000
Net income									$10,400,000

Acquisition_and_Divestiture_Ac3

Acquisition and Divestiture Activity - Schedule of Purchase Price Allocation (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2014
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2014
Business Acquisition [Line Items]
Federal Home Loan Bank stock	$41,334	$40,584
Deposits	-8,490,664	-7,210,903
Goodwill	530,845	352,729	338,820
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
Short-term borrowings	-18,898
Other borrowings	-21,113
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
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
Short-term borrowings	-10,420
Other borrowings	-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
Bank of America [Member]
Business Acquisition [Line Items]
Cash and cash equivalents				562,906
Loans				5,638
Premises and equipment				12,559
Accrued interest receivable				15
Other assets				331
Deposits				-565,106
Accrued expenses and other liabilities				-246
Net tangible assets acquired				16,097
Definite-lived intangible assets acquired				3,462
Goodwill				13,347
Purchase price				32,906
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	236,201
Premises and equipment	6,492
Accrued interest receivable	1,044
Other real estate owned	30
Company-owned life insurance	7,438
Other assets	11,182
Deposits	-292,068
Other borrowings	-15,203
Accrued expenses and other liabilities	-4,582
Net tangible assets acquired	26,027
Definite-lived intangible assets acquired	2,618
Loan servicing rights	990
Goodwill	39,960
Purchase price	$69,595

Acquisition_and_Divestiture_Ac4

Acquisition and Divestiture Activity - Schedule of Components of Estimated Fair Value of Intangible Assets (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014
Tower Financial Corporation [Member]
Business Acquisition [Line Items]
Estimated Fair Value	$8,400,000
United Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Estimated Fair Value	10,800,000
Core Deposit Intangible [Member] \| Tower Financial Corporation [Member]
Business Acquisition [Line Items]
Estimated Fair Value	4,600,000
Estimated Useful Lives (Years)	7 years
Core Deposit Intangible [Member] \| United Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Estimated Fair Value	5,900,000
Estimated Useful Lives (Years)	7 years
Trust Customer Relationship Intangible [Member] \| Tower Financial Corporation [Member]
Business Acquisition [Line Items]
Estimated Fair Value	3,800,000
Estimated Useful Lives (Years)	12 years
Trust Customer Relationship Intangible [Member] \| United Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Estimated Fair Value	$4,900,000
Estimated Useful Lives (Years)	12 years

Acquisition_and_Divestiture_Ac5

Acquisition and Divestiture Activity - Schedule of Acquired Loan Data (Detail) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified	Dec. 31, 2014
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
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
LSB Financial Corp. [Member]
Loans at Acquisition Date [Line Items]
Fair Value of Acquired Loans at Acquisition Date	236,201
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	224,215
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

Acquisition_and_Divestiture_Ac6

Acquisition and Divestiture Activity - Summary of Unaudited Pro-forma Information (Detail) (Tower and United Acquisitions [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Tower and United Acquisitions [Member]
Business Acquisition [Line Items]
Revenue	$590,492	$609,261
Net income	$138,056	$145,635

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Income (Loss) (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	($44,466)	$29,801	$15,004
Other comprehensive income (loss) before reclassifications	20,492	-78,372	21,854
Amounts reclassified from accumulated other comprehensive income (loss)	-7,581	4,105	-7,057
Other comprehensive income (loss), net of tax	12,911	-74,267	14,797
Ending Balance	-31,555	-44,466	29,801
Accumulated Unrealized Gains and Losses on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	-21,108	39,054	24,612
Other comprehensive income (loss) before reclassifications	26,391	-57,958	22,808
Amounts reclassified from accumulated other comprehensive income (loss)	-6,031	-2,204	-8,366
Other comprehensive income (loss), net of tax	20,360	-60,162	14,442
Ending Balance	-748	-21,108	39,054
Accumulated Unrealized Gains Losses on Held-to-Maturity Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	-16,767	3,269	4,745
Other comprehensive income (loss) before reclassifications		-20,224	-954
Amounts reclassified from accumulated other comprehensive income (loss)	991	188	-522
Other comprehensive income (loss), net of tax	991	-20,036	-1,476
Ending Balance	-15,776	-16,767	3,269
Accumulated Gains and Losses on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	-190		145
Other comprehensive income (loss) before reclassifications	-5,899	-190
Amounts reclassified from accumulated other comprehensive income (loss)	154		-145
Other comprehensive income (loss), net of tax	-5,745	-190	-145
Ending Balance	-5,935	-190
Accumulated Defined Benefit Pensions Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	-6,401	-12,522	-14,498
Amounts reclassified from accumulated other comprehensive income (loss)	-2,695	6,121	1,976
Other comprehensive income (loss), net of tax	-2,695	6,121	1,976
Ending Balance	($9,096)	($6,401)	($12,522)

Accumulated_Other_Comprehensiv3

Accumulated Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net periodic pension cost									($5,781)	$7,363	($1,529)
Interest income/(expense)	90,043	108,367	84,482	83,478	81,187	77,996	79,191	79,050	366,370	317,424	308,757
Impairment losses									-100		-165
Amortization of net actuarial losses									1,933	3,436	5,197
Tax (expense) or benefit	-10,302	-11,095	-7,658	-9,242	-10,602	-6,869	-13,734	-10,392	-38,297	-41,597	-36,110
Net income	29,250	29,134	18,773	26,510	24,549	23,948	28,478	23,945	103,667	100,920	91,675
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income									7,581	-4,105	7,057
Reclassification 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									9,830	4,341	15,052
Impairment losses									-100	-1,000	-1,414
Total before tax									9,730	3,341	13,638
Tax (expense) or benefit									-3,699	-1,137	-5,272
Net income									6,031	2,204	8,366
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member] \| Accumulated Unrealized Gains Losses on Held-to-Maturity Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income/(expense)									-1,437	-225	870
Tax (expense) or benefit									446	37	-348
Net income									-991	-188	522
Reclassification 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]
Tax (expense) or benefit									94		-95
Net income									-154		145
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member] \| Accumulated Gains and Losses on Cash Flow Hedges [Member] \| Interest Rate Contract [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income/(expense)									-248		240
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member] \| Accumulated Defined Benefit Pensions Plans [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net periodic pension cost									6,266	-6,901	1,903
Amortization of net actuarial losses									-1,933	-3,436	-5,197
Tax (expense) or benefit									-1,638	4,216	1,318
Net income									$2,695	($6,121)	($1,976)

Investment_Securities_Amortize

Investment Securities - Amortized Cost and Fair Value of Available-for-Sale and Held-to-Maturity Investment Securities Portfolio (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale, Amortized Cost	$2,658,969	$2,406,283
Available-for-sale, Unrealized Gains	33,309	31,900
Available-for-sale, Unrealized Losses	-34,606	-65,982
Available-for-Sale securities, Fair Value	2,657,672	2,372,201
Held-to-maturity, Amortized Cost	844,054	762,734
Held-to-maturity, Unrealized Gains	59,958	19,604
Held-to-maturity, Unrealized Losses	-77	-1,580
Held-to-Maturity, Fair Value	903,935	780,758
U.S. Treasury [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale, Amortized Cost	14,978	12,995
Available-for-sale, Unrealized Gains	196	118
Available-for-sale, Unrealized Losses	-8
Available-for-Sale securities, Fair Value	15,166	13,113
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	692,704	456,123
Available-for-sale, Unrealized Gains	1,533	464
Available-for-sale, Unrealized Losses	-8,286	-20,999
Available-for-Sale securities, Fair Value	685,951	435,588
Held-to-maturity, Amortized Cost	167,207	170,621
Held-to-maturity, Unrealized Gains	6,279	7,749
Held-to-Maturity, Fair Value	173,486	178,370
Mortgage-backed Securities - Agency [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale, Amortized Cost	1,233,811	1,300,135
Available-for-sale, Unrealized Gains	18,219	15,690
Available-for-sale, Unrealized Losses	-10,368	-26,567
Available-for-Sale securities, Fair Value	1,241,662	1,289,258
Held-to-maturity, Amortized Cost	23,648	35,443
Held-to-maturity, Unrealized Gains	926	906
Held-to-maturity, Unrealized Losses		-1
Held-to-Maturity, Fair Value	24,574	36,348
Mortgage-backed Securities - Non-agency [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale, Amortized Cost		17,036
Available-for-sale, Unrealized Gains		376
Available-for-Sale securities, Fair Value		17,412
States and Political Subdivisions [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale, Amortized Cost	304,435	260,398
Available-for-sale, Unrealized Gains	11,023	10,112
Available-for-sale, Unrealized Losses	-917	-1,715
Available-for-Sale securities, Fair Value	314,541	268,795
Held-to-maturity, Amortized Cost	653,199	556,670
Held-to-maturity, Unrealized Gains	52,753	10,949
Held-to-maturity, Unrealized Losses	-77	-1,579
Held-to-Maturity, Fair Value	705,875	566,040
Pooled Trust Preferred Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale, Amortized Cost	17,965	19,215
Available-for-sale, Unrealized Losses	-11,358	-11,178
Available-for-Sale securities, Fair Value	6,607	8,037
Other Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale, Amortized Cost	395,076	340,381
Available-for-sale, Unrealized Gains	2,338	5,140
Available-for-sale, Unrealized Losses	-3,669	-5,523
Available-for-Sale securities, Fair Value	$393,745	$339,998

Investment_Securities_Schedule

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 $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sales of available-for-sale securities	$214,912	$231,806	$227,566
Proceeds from calls of available-for-sale securities	468,764	632,614	591,735
Total	338,053	404,271	376,975
Realized gains on sales of available-for-sale securities	9,938	4,715	14,101
Realized losses on sales of available-for-sale securities	-128	-865	-9
Other securities gains	337	612	165
Net securities gains	9,830	4,341	15,052
Calls [Member]
Schedule of Available-for-sale Securities [Line Items]
Proceeds from calls of available-for-sale securities	123,141	172,465	149,409
Realized gains on calls of available-for-sale securities	154	50	802
Realized losses on calls of available-for-sale securities	($471)	($171)	($7)

Investment_Securities_Addition

Investment Securities - Additional Information (Detail) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2014	Sep. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
			Segment
			Security
Investment [Line Items]
Securities pledged to secure public and other funds, carrying value			$1,400,000,000	$1,100,000,000
Trading securities that consist of mutual funds			3,881,000	3,566,000
Available-for-sale portfolio transferred to held-to-maturity portfolio, fair value		357,800,000
Unrealized holding loss on available-for-sale portfolio transferred to held-to-maturity portfolio		31,000,000
Number of segments			2
Other-than-temporary-impairment losses on securities			100,000	1,000,000	1,414,000
Number of securities in security portfolio			1,702
Number of securities in unrealized loss position			242
Unrealized losses			34,606,000	65,982,000
Other than temporary impairment losses			100,000	1,000,000	1,414,000
Other than temporary impairment losses on pooled trust preferred securities	100,000
Indiana [Member]
Investment [Line Items]
Investment securities issued by states and political subdivisions, market value			328,200,000	297,300,000
State and political subdivision investment, equity percentage			22.40%	25.60%
Percentage of municipal bonds rated A or better			90.00%
Percentage of non rated local interest bonds			10.00%
Texas [Member]
Investment [Line Items]
Investment securities issued by states and political subdivisions, market value			194,000,000	136,500,000
State and political subdivision investment, equity percentage			13.20%	11.70%
Limited Partnerships [Member]
Investment [Line Items]
Extension period	1 year		1 year
Former Directors and Executives of Monroe Bancorp [Member]
Investment [Line Items]
Trading securities that consist of mutual funds			3,900,000	3,600,000
Pooled Trust Preferred Securities, Not Subject to FASB ASC 325-10 [Member]
Investment [Line Items]
Number of trust preferred securities			2	2
Securities portfolio at fair value			6,400,000	6,900,000
Unrealized losses			7,600,000	7,300,000
Pooled Trust Preferred Securities, Subject To FASB ASC 325-10 [Member]
Investment [Line Items]
Number of trust preferred securities			1	2
Securities portfolio at fair value			200,000	1,200,000
Unrealized losses			3,800,000	3,900,000
Pooled Trust Preferred Securities [Member]
Investment [Line Items]
Number of trust preferred securities			3
Securities portfolio at fair value			6,600,000
Unrealized losses			11,400,000
Unrealized losses			11,358,000	11,178,000
Other than temporary impairment losses			$0	$1,000,000

Investment_Securities_Expected

Investment Securities - Expected Maturities of Investment Securities Portfolio (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]
Available-for-Sale, Maturity, Within one year, Amortized Cost	$39,429	$23,839
Available-for-Sale, Maturity, One to five years, Amortized Cost	435,460	216,236
Available-for-Sale, Maturity, Five to ten years, Amortized Cost	631,821	534,720
Available-for-Sale, Maturity, Beyond ten years, Amortized Cost	1,552,259	1,631,488
Available-for-Sale, Amortized Cost	2,658,969	2,406,283
Held-to-Maturity, Maturity, Within one year, Amortized Cost	1,508	72
Held-to-Maturity, Maturity, One to five years, Amortized Cost	25,417	15,035
Held-to-Maturity, Maturity, Five to ten years, Amortized Cost	182,854	164,138
Held-to-Maturity, Maturity, Beyond ten years, Amortized Cost	634,275	583,489
Held-to-Maturity, Amortized Cost	844,054	762,734
Available-for-Sale, Maturity, Within one year, Fair Value	40,019	23,884
Available-for-Sale, Maturity, One to five years, Fair Value	437,972	222,293
Available-for-Sale, Maturity, Five to ten years, Fair Value	630,599	519,692
Available-for-Sale, Maturity, Beyond ten years, Fair Value	1,549,082	1,606,332
Available-for-Sale securities, Fair Value	2,657,672	2,372,201
Held-to-Maturity, Maturity, Within one year, Fair Value	1,511	73
Held-to-Maturity, Maturity, One to five years, Fair Value	26,579	15,757
Held-to-Maturity, Maturity, Five to ten years, Fair Value	189,953	169,345
Held-to-Maturity, Maturity, Beyond ten years, Fair Value	685,892	595,583
Held-to-Maturity, Fair Value	$903,935	$780,758
Available-for-Sale, Maturity, Within one year, Weighted Average Yield	4.82%	3.52%
Available-for-Sale, Maturity, One to five years, Weighted Average Yield	1.88%	2.79%
Available-for-Sale, Maturity, Five to ten years, Weighted Average Yield	2.25%	2.39%
Available-for-Sale, Maturity, Beyond ten years, Weighted Average Yield	2.25%	2.46%
Available-for-Sale, Weighted Average Yield	2.23%	2.48%
Held-to-Maturity, Maturity, Within one year, Weighted Average Yield	3.14%	3.46%
Held-to-Maturity, Maturity, One to five years, Weighted Average Yield	3.90%	4.02%
Held-to-Maturity, Maturity, Five to ten years, Weighted Average Yield	3.37%	3.19%
Held-to-Maturity, Maturity, Beyond ten years, Weighted Average Yield	5.51%	5.56%
Held-to-Maturity, Weighted Average Yield	4.99%	5.02%

Investment_Securities_Investme

Investment Securities - Investment Securities with Unrealized Losses by Aggregated Major Security Type and Length of Time in Continuous Unrealized Loss Position (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	$378,770	$1,282,703
Available-for-Sale, Less than 12 Months, Unrealized Losses	-1,887	-45,328
Available-for-Sale, 12 months or longer, Fair Value	756,187	115,119
Available-for-Sale, 12 months or longer, Unrealized Losses	-32,719	-20,654
Available-for-Sale, Fair Value	1,134,957	1,397,822
Available-for-Sale, Unrealized Losses	-34,606	-65,982
Held-to-Maturity, Less than 12 Months, Fair Value	6,171	91,532
Held-to-Maturity, Less than 12 Months, Unrealized Losses	-77	-1,580
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	6,171	91,532
Held-to-Maturity, Unrealized Losses	-77	-1,580
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	9,524	1,900
Available-for-Sale, Less than 12 Months, Unrealized Losses	-8
Available-for-Sale, Fair Value	9,524	1,900
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	180,488	357,793
Available-for-Sale, Less than 12 Months, Unrealized Losses	-563	-17,547
Available-for-Sale, 12 months or longer, Fair Value	257,914	38,988
Available-for-Sale, 12 months or longer, Unrealized Losses	-7,723	-3,452
Available-for-Sale, Fair Value	438,402	396,781
Available-for-Sale, Unrealized Losses	-8,286	-20,999
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	31,304	668,018
Available-for-Sale, Less than 12 Months, Unrealized Losses	-122	-23,455
Available-for-Sale, 12 months or longer, Fair Value	386,788	41,200
Available-for-Sale, 12 months or longer, Unrealized Losses	-10,246	-3,112
Available-for-Sale, Fair Value	418,092	709,218
Available-for-Sale, Unrealized Losses	-10,368	-26,567
Held-to-Maturity, Less than 12 Months, Fair Value		21,370
Held-to-Maturity, Less than 12 Months, Unrealized Losses		-1
Held-to-Maturity, 12 months or longer, Fair Value		0
Held-to-Maturity, 12 months or longer, Unrealized Losses		0
Held-to-maturity, Fair Value		21,370
Held-to-Maturity, Unrealized Losses		-1
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	41,481	45,077
Available-for-Sale, Less than 12 Months, Unrealized Losses	-288	-1,620
Available-for-Sale, 12 months or longer, Fair Value	9,534	2,812
Available-for-Sale, 12 months or longer, Unrealized Losses	-629	-95
Available-for-Sale, Fair Value	51,015	47,889
Available-for-Sale, Unrealized Losses	-917	-1,715
Held-to-Maturity, Less than 12 Months, Fair Value	6,171	70,162
Held-to-Maturity, Less than 12 Months, Unrealized Losses	-77	-1,579
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	6,171	70,162
Held-to-Maturity, Unrealized Losses	-77	-1,579
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	6,607	8,037
Available-for-Sale, 12 months or longer, Unrealized Losses	-11,358	-11,178
Available-for-Sale, Fair Value	6,607	8,037
Available-for-Sale, Unrealized Losses	-11,358	-11,178
Other Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	115,973	209,915
Available-for-Sale, Less than 12 Months, Unrealized Losses	-906	-2,706
Available-for-Sale, 12 months or longer, Fair Value	95,344	24,082
Available-for-Sale, 12 months or longer, Unrealized Losses	-2,763	-2,817
Available-for-Sale, Fair Value	211,317	233,997
Available-for-Sale, Unrealized Losses	($3,669)	($5,523)

Investment_Securities_Pooled_T

Investment Securities - Pooled Trust Preferred Securities (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Amortized Cost	$4,679
Available-for-Sale securities, Fair Value	2,657,672	2,372,201
Reg Div Funding 2004 [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Lowest Credit Rating	D
Amortized Cost	4,012
Pooled Trust Preferred Securities One [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Amortized Cost	17,965
Available-for-Sale securities, Fair Value	6,607
Available-for-sale, Unrealized Losses	-11,358
Realized Losses 2014	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	B-2
Lowest Credit Rating	D
Amortized Cost	4,012
Available-for-Sale securities, Fair Value	217
Available-for-sale, Unrealized Losses	-3,795
Realized Losses 2014	0
# of Issuers Currently Performing	24
# of Issuers Currently Remaining	42
Actual Deferrals and Defaults as a Percent of Original Collateral	37.60%
Expected Defaults as a % of Remaining Performing Collateral	8.00%
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	4,511
Available-for-Sale securities, Fair Value	2,333
Available-for-sale, Unrealized Losses	-2,178
Realized Losses 2014	0
# of Issuers Currently Performing	33
# of Issuers Currently Remaining	46
Actual Deferrals and Defaults as a Percent of Original Collateral	23.90%
Expected Defaults as a % of Remaining Performing Collateral	15.00%
Excess Subordination as a % of Current Performing Collateral	37.60%
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	B+
Amortized Cost	9,442
Available-for-Sale securities, Fair Value	4,057
Available-for-sale, Unrealized Losses	-5,385
Realized Losses 2014	0
# of Issuers Currently Performing	42
# of Issuers Currently Remaining	53
Actual Deferrals and Defaults as a Percent of Original Collateral	16.30%
Expected Defaults as a % of Remaining Performing Collateral	9.80%
Excess Subordination as a % of Current Performing Collateral	46.50%
Single Issuer Trust Preferred Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Amortized Cost	13,546
Available-for-Sale securities, Fair Value	12,632
Available-for-sale, Unrealized Losses	-914
Realized Losses 2014	0
Single Issuer Trust Preferred Securities [Member] \| First Empire Cap (M&T) [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Lowest Credit Rating	BB+
Amortized Cost	960
Available-for-Sale securities, Fair Value	1,010
Available-for-sale, Unrealized Losses	50
Realized Losses 2014	0
Single Issuer Trust Preferred Securities [Member] \| First Empire Cap (M&T) [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Lowest Credit Rating	BB+
Amortized Cost	2,916
Available-for-Sale securities, Fair Value	3,029
Available-for-sale, Unrealized Losses	113
Realized Losses 2014	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	3,381
Available-for-Sale securities, Fair Value	2,800
Available-for-sale, Unrealized Losses	-581
Realized Losses 2014	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	4,745
Available-for-Sale securities, Fair Value	4,150
Available-for-sale, Unrealized Losses	-595
Realized Losses 2014	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	751
Available-for-Sale securities, Fair Value	800
Available-for-sale, Unrealized Losses	49
Realized Losses 2014	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	793
Available-for-Sale securities, Fair Value	843
Available-for-sale, Unrealized Losses	50
Realized Losses 2014	0
Trust Preferred Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Amortized Cost	31,511
Available-for-Sale securities, Fair Value	19,239
Available-for-sale, Unrealized Losses	-12,272
Realized Losses 2014	$0

Investment_Securities_Securiti

Investment Securities - Securities with Other-than-Temporary-Impairment (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2012
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Amortized Cost	$4,679
Amount of other-than-temporary-impairment recognized in earnings	100	165
Life-to date	5,785
Reg Div Funding 2004 [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Vintage	2004
Lowest Credit Rating	D
Amortized Cost	4,012
Amount of other-than-temporary-impairment recognized in earnings		165
Life-to date	5,685
Limited Partnership [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Amortized Cost	667
Amount of other-than-temporary-impairment recognized in earnings	100
Life-to date	$100

Loans_Held_for_Sale_Additional

Loans Held for Sale - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended		12 Months Ended
	Jun. 30, 2013	Dec. 31, 2014	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012
	Jun. 30, 2013	Loans	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012
Servicing Assets at Fair Value [Line Items]
Residential loans held for sale, at fair value		$15,600,000		$7,705,000
Number of expected transactions for sale of loans		2
Finance leases and loans held for sale	11,600,000
Loss recognized due to transfer of leases	200,000
Average maturity of portfolio of leases held for sale	2 years 8 months 12 days
Additional loss from sale of leases held for sale			0
Proceeds from sale of loans				114,527,000	2,355,000
Minimum [Member]
Servicing Assets at Fair Value [Line Items]
Interest rate on portfolio of leases held for sale	3.57%
Maximum [Member]
Servicing Assets at Fair Value [Line Items]
Interest rate on portfolio of leases held for sale	10.22%
Residential Real Estate [Member]
Servicing Assets at Fair Value [Line Items]
Loans reclassified from held for investment to held for sale		71,600,000	96,900,000
Proceeds from sale of loans held for sale			96,900,000
Finance leases and loans held for sale		0
Gain loss on loans held for sale			0
Commercial and Commercial Real Estate [Member]
Servicing Assets at Fair Value [Line Items]
Finance leases and loans held for sale		0
Commercial and commercial real estate loans held for investment				5,900,000
Purchased impaired loans				400,000
Proceeds from sale of loans				7,100,000
Charge-offs				200,000
Other noninterest income				1,000,000
Income recognized on sale of loans				400,000
Consumer Loan [Member]
Servicing Assets at Fair Value [Line Items]
Loans reclassified from held for investment to held for sale		50,100,000
Commercial Loan [Member]
Servicing Assets at Fair Value [Line Items]
Loans reclassified from held for investment to held for sale		45,500,000
Commercial Real Estate [Member]
Servicing Assets at Fair Value [Line Items]
Loans reclassified from held for investment to held for sale		$30,700,000

Finance_Receivables_and_Allowa2

Finance Receivables and Allowance for Credit Losses - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Percentage covered up to $467.2 million	0.00%
Loan placed on nonaccrual when past due, number of days	90 days
Number of months required for loan to return to accrual status	6 months
Loan participations	$285,900,000
Loan participations sold	160,100,000
Loan participations retained	125,800,000
Troubled debt restructuring term	6 months
Value of small commercial loans on nonaccrual status or 90 days or more delinquent	250,000
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
Troubled debt restructurings	35,000,000	48,900,000
Financing receivable TDR's included with non-accrual loans	22,100,000	33,100,000
Financing receivable troubled debt restructurings specific reserves	2,800,000	4,100,000
Unfunded commitments on TDRs	1,100,000
Increase in allowance for loan losses	500,000	100,000
Charge-offs	100,000	200,000
Number of days for a loan to be considered to be in payment default	90 days
Charge-offs TDR that subsequently defaulted		100,000
Troubled debt restructuring modification payment delay	90 days
Outstanding noncovered loans including principal, interest, fees and penalties	135,900,000	115,000,000
Accretion recorded as loan interest income	16,000,000	16,800,000
Financing receivable allowance for loan losses related to purchased loans	1,500,000	2,600,000
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
Credit Concentration Risk [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Concentration of commercial loans in a single industry, maximum	10.00%
Losses up to $275.0 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loss amount covered at 80% up to $467.2 million	80.00%
Loss amount covered at 80% up to $275 million	275,000,000
Losses in Excess of $467.2 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loss amount covered at 80% up to $467.2 million	80.00%
Loss amount covered at 80% up to $275 million	467,200,000
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Troubled debt restructurings	15,200,000	22,500,000
Charge-offs	3,396,000	3,810,000	7,636,000
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Troubled debt restructurings	15,200,000	22,600,000
Charge-offs	2,352,000	5,427,000	4,386,000
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Troubled debt restructurings	2,500,000	1,400,000
Charge-offs	4,675,000	6,279,000	8,094,000
Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Troubled debt restructurings	2,100,000	2,400,000
Charge-offs	$793,000	$1,487,000	$2,204,000

Finance_Receivables_and_Allowa3

Finance Receivables and Allowance for Credit Losses - Schedule of Composition of Loans (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans by lending classification	$6,318,201	$5,082,964
Allowance for loan losses	-44,297	-41,741
Allowance for loan losses - covered loans	-3,552	-5,404
Net loans	6,270,352	5,035,819
Commercial Loan Including Finance Lease [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans by lending classification	1,629,600	1,373,415
Commercial Real Estate - Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans by lending classification	134,552	88,630
Commercial Real Estate - Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans by lending classification	1,576,558	1,072,260
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans by lending classification	1,519,156	1,359,569
Consumer Credit - Heloc [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans by lending classification	360,320	251,102
Consumer Credit - Auto [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans by lending classification	846,969	620,473
Consumer Credit - Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans by lending classification	103,338	99,683
Covered Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans by lending classification	$147,708	$217,832

Finance_Receivables_and_Allowa4

Finance Receivables and Allowance for Credit Losses - Schedule of Composition of Loans (Parenthetical) (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Receivables [Abstract]
Direct finance leases	$19.30	$27.80

Finance_Receivables_and_Allowa5

Finance Receivables and Allowance for Credit Losses - Schedule of Activity in Related Party Loans (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014
Receivables [Abstract]
Balance, January 1	$12,750
New loans	5,101
Repayments	-4,896
Officer and director changes	7,605
Balance, December 31	$20,560

Finance_Receivables_and_Allowa6

Finance Receivables and Allowance for Credit Losses - Schedule of Activity in Allowance for Loan Losses (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Charge-offs									($100)	($200)
Provision	869	2,591	-400	37	2,253	-1,724	-3,693	845	3,097	-2,319	5,030
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance				16,565				14,642	16,565	14,642	19,964
Charge-offs									-3,396	-3,810	-7,636
Recoveries									2,986	4,098	5,166
Provision									4,515	1,635	-2,852
Ending balance	20,670				16,565				20,670	16,565	14,642
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance				22,401				31,289	22,401	31,289	26,993
Charge-offs									-2,352	-5,427	-4,386
Recoveries									2,576	2,963	5,104
Provision									-5,277	-6,424	3,578
Ending balance	17,348				22,401				17,348	22,401	31,289
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance				4,940				5,155	4,940	5,155	6,954
Charge-offs									-4,675	-6,279	-8,094
Recoveries									3,056	4,333	3,259
Provision									3,548	1,731	3,036
Ending balance	6,869				4,940				6,869	4,940	5,155
Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance				3,239				3,677	3,239	3,677	4,149
Charge-offs									-793	-1,487	-2,204
Recoveries									205	310	464
Provision									311	739	1,268
Ending balance	2,962				3,239				2,962	3,239	3,677
Loans and Leases Receivable Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance				47,145				54,763	47,145	54,763	58,060
Charge-offs									-11,216	-17,003	-22,320
Recoveries									8,823	11,704	13,993
Provision									3,097	-2,319	5,030
Ending balance	$47,849				$47,145				$47,849	$47,145	$54,763

Finance_Receivables_and_Allowa7

Finance Receivables and Allowance for Credit Losses - Schedule of Recorded Investment in Financing Receivables (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, Ending balance: individually evaluated for impairment	$10,225	$8,346
Allowance for credit losses, Ending balance: collectively evaluated for impairment	34,981	32,378
Allowance for credit losses, Ending balance: noncovered loans acquired with deteriorated credit quality	1,539	2,569
Allowance for credit losses, Ending balance: covered loans acquired with deteriorated credit quality	1,104	3,852
Total allowance for credit losses	47,849	47,145
Loans and leases outstanding, Ending balance: individually evaluated for impairment	83,820	69,210
Loans and leases outstanding, Ending balance: collectively evaluated for impairment	6,108,854	4,841,719
Loans and leases outstanding, Ending balance: loans acquired with deteriorated credit quality	47,370	37,145
Loans and leases outstanding, Ending balance: covered loans acquired with deteriorated credit quality	78,157	134,890
Total loans	6,318,201	5,082,964
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, Ending balance: individually evaluated for impairment	7,280	6,156
Allowance for credit losses, Ending balance: collectively evaluated for impairment	12,163	9,980
Allowance for credit losses, Ending balance: noncovered loans acquired with deteriorated credit quality	406	429
Allowance for credit losses, Ending balance: covered loans acquired with deteriorated credit quality	821
Total allowance for credit losses	20,670	16,565
Loans and leases outstanding, Ending balance: individually evaluated for impairment	38,485	34,213
Loans and leases outstanding, Ending balance: collectively evaluated for impairment	1,598,352	1,355,608
Loans and leases outstanding, Ending balance: loans acquired with deteriorated credit quality	2,770	648
Loans and leases outstanding, Ending balance: covered loans acquired with deteriorated credit quality	7,160	12,281
Total loans	1,646,767	1,402,750
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, Ending balance: individually evaluated for impairment	2,945	2,190
Allowance for credit losses, Ending balance: collectively evaluated for impairment	13,354	14,816
Allowance for credit losses, Ending balance: noncovered loans acquired with deteriorated credit quality	1,049	2,025
Allowance for credit losses, Ending balance: covered loans acquired with deteriorated credit quality		3,370
Total allowance for credit losses	17,348	22,401
Loans and leases outstanding, Ending balance: individually evaluated for impairment	45,335	34,997
Loans and leases outstanding, Ending balance: collectively evaluated for impairment	1,631,794	1,106,971
Loans and leases outstanding, Ending balance: loans acquired with deteriorated credit quality	37,394	23,618
Loans and leases outstanding, Ending balance: covered loans acquired with deteriorated credit quality	37,384	77,232
Total loans	1,751,907	1,242,818
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, Ending balance: collectively evaluated for impairment	6,519	4,494
Allowance for credit losses, Ending balance: noncovered loans acquired with deteriorated credit quality	67	80
Allowance for credit losses, Ending balance: covered loans acquired with deteriorated credit quality	283	366
Total allowance for credit losses	6,869	4,940
Loans and leases outstanding, Ending balance: collectively evaluated for impairment	1,359,537	1,019,576
Loans and leases outstanding, Ending balance: loans acquired with deteriorated credit quality	7,073	12,725
Loans and leases outstanding, Ending balance: covered loans acquired with deteriorated credit quality	12,507	17,673
Total loans	1,379,117	1,049,974
Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, Ending balance: collectively evaluated for impairment	2,945	3,088
Allowance for credit losses, Ending balance: noncovered loans acquired with deteriorated credit quality	17	35
Allowance for credit losses, Ending balance: covered loans acquired with deteriorated credit quality		116
Total allowance for credit losses	2,962	3,239
Loans and leases outstanding, Ending balance: collectively evaluated for impairment	1,519,171	1,359,564
Loans and leases outstanding, Ending balance: loans acquired with deteriorated credit quality	133	154
Loans and leases outstanding, Ending balance: covered loans acquired with deteriorated credit quality	21,106	27,704
Total loans	$1,540,410	$1,387,422

Finance_Receivables_and_Allowa8

Finance Receivables and Allowance for Credit Losses - Schedule of Risk Category of Loans (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Commercial Loan [Member]
Risk Category Of Loans [Line Items]
Total	$1,629,600	$1,373,415
Commercial Loan [Member] \| Pass [Member]
Risk Category Of Loans [Line Items]
Total	1,442,904	1,237,983
Commercial Loan [Member] \| Criticized [Member]
Risk Category Of Loans [Line Items]
Total	89,775	90,545
Commercial Loan [Member] \| Classified - Substandard [Member]
Risk Category Of Loans [Line Items]
Total	58,461	16,252
Commercial Loan [Member] \| Classified - Nonaccrual [Member]
Risk Category Of Loans [Line Items]
Total	38,003	27,635
Commercial Loan [Member] \| Classified - Doubtful [Member]
Risk Category Of Loans [Line Items]
Total	457	1,000
Commercial Real Estate - Construction [Member]
Risk Category Of Loans [Line Items]
Total	134,552	88,630
Commercial Real Estate - Construction [Member] \| Pass [Member]
Risk Category Of Loans [Line Items]
Total	119,958	74,815
Commercial Real Estate - Construction [Member] \| Criticized [Member]
Risk Category Of Loans [Line Items]
Total	2,229	9,383
Commercial Real Estate - Construction [Member] \| Classified - Substandard [Member]
Risk Category Of Loans [Line Items]
Total	5,866	2,559
Commercial Real Estate - Construction [Member] \| Classified - Nonaccrual [Member]
Risk Category Of Loans [Line Items]
Total	6,499	1,873
Commercial Real Estate - Other [Member]
Risk Category Of Loans [Line Items]
Total	1,576,558	1,072,260
Commercial Real Estate - Other [Member] \| Pass [Member]
Risk Category Of Loans [Line Items]
Total	1,374,191	943,781
Commercial Real Estate - Other [Member] \| Criticized [Member]
Risk Category Of Loans [Line Items]
Total	102,805	35,473
Commercial Real Estate - Other [Member] \| Classified - Substandard [Member]
Risk Category Of Loans [Line Items]
Total	38,659	42,516
Commercial Real Estate - Other [Member] \| Classified - Nonaccrual [Member]
Risk Category Of Loans [Line Items]
Total	59,771	49,406
Commercial Real Estate - Other [Member] \| Classified - Doubtful [Member]
Risk Category Of Loans [Line Items]
Total	$1,132	$1,084

Finance_Receivables_and_Allowa9

Finance Receivables and Allowance for Credit Losses - Schedule of Recorded Investment in Residential and Consumer Loans Based on Payment Activity (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Consumer Heloc [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivable recorded investment	$360,320	$251,102
Consumer Heloc [Member] \| Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivable recorded investment	357,205	249,152
Consumer Heloc [Member] \| Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivable recorded investment	3,115	1,950
Consumer Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivable recorded investment	846,969	620,473
Consumer Auto [Member] \| Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivable recorded investment	845,708	618,911
Consumer Auto [Member] \| Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivable recorded investment	1,261	1,562
Consumer - Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivable recorded investment	103,338	99,683
Consumer - Other [Member] \| Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivable recorded investment	101,811	97,877
Consumer - Other [Member] \| Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivable recorded investment	1,527	1,806
Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivable recorded investment	1,519,156	1,359,569
Residential [Member] \| Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivable recorded investment	1,505,188	1,349,236
Residential [Member] \| Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance receivable recorded investment	$13,968	$10,333

Recovered_Sheet1

Finance Receivables and Allowance for Credit Losses - Schedule of Impaired Loans that are Individually Evaluated (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Recorded Investment, Total Loans	$82,581	$64,849
Unpaid Principal Balance, Total Loans	89,488	75,893
Related Allowance	7,979	7,068
Commercial Loan [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment with no related allowance	25,483	17,066
Unpaid Principal Balance with no related allowance	25,854	17,417
Recorded Investment with related allowance	7,471	9,282
Unpaid Principal Balance with related allowance	10,488	12,304
Related Allowance	4,883	4,723
Commercial Real Estate - Construction [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment with no related allowance	2,168	525
Unpaid Principal Balance with no related allowance	1,397	633
Recorded Investment with related allowance	98
Unpaid Principal Balance with related allowance	98
Related Allowance	11
Commercial Real Estate - Other [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment with no related allowance	28,637	15,746
Unpaid Principal Balance with no related allowance	30,723	22,550
Recorded Investment with related allowance	14,432	18,726
Unpaid Principal Balance with related allowance	16,503	19,358
Related Allowance	2,934	2,190
Consumer Loan [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment with no related allowance	685	324
Unpaid Principal Balance with no related allowance	748	342
Recorded Investment with related allowance	1,543	835
Unpaid Principal Balance with related allowance	1,543	888
Related Allowance	77	43
Residential [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment with no related allowance	588	106
Unpaid Principal Balance with no related allowance	658	106
Recorded Investment with related allowance	1,476	2,239
Unpaid Principal Balance with related allowance	1,476	2,295
Related Allowance	$74	$112

Recovered_Sheet2

Finance Receivables and Allowance for Credit Losses - Schedule of Average Balance and Interest Income Recognized on Impaired Loans (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment, Total	$68,185	$71,200
Interest Income Recognized	1,371	656
Commercial Loan [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment with no related allowance	21,592	11,815
Interest Income Recognized with no related allowance	325	135
Average Recorded Investment with an allowance recorded	7,579	16,351
Interest Income Recognized with an allowance recorded	94	123
Commercial Real Estate - Construction [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment with no related allowance	1,347	852
Interest Income Recognized with no related allowance	69
Average Recorded Investment with an allowance recorded	49	1,614
Interest Income Recognized with an allowance recorded	4
Commercial Real Estate - Other [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment with no related allowance	21,560	16,345
Interest Income Recognized with no related allowance	328	140
Average Recorded Investment with an allowance recorded	12,160	22,317
Interest Income Recognized with an allowance recorded	409	134
Consumer Loan [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment with no related allowance	505	138
Interest Income Recognized with no related allowance	14	10
Average Recorded Investment with an allowance recorded	1,189	526
Interest Income Recognized with an allowance recorded	58	40
Residential [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment with no related allowance	347	62
Interest Income Recognized with no related allowance	1	1
Average Recorded Investment with an allowance recorded	1,857	1,180
Interest Income Recognized with an allowance recorded	$69	$73

Recovered_Sheet3

Finance Receivables and Allowance for Credit Losses - Schedule of Past Due Financing Receivables (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	$22,461	$18,134
60-89 Days Past Due	8,024	4,884
Recorded Investment > 90 Days and Accruing	458	238
Nonaccrual	140,857	128,442
Total Past Due	171,800	151,698
Current	6,146,401	4,931,266
Commercial Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	649	1,532
60-89 Days Past Due	813	13
Recorded Investment > 90 Days and Accruing	33
Nonaccrual	38,460	28,635
Total Past Due	39,955	30,180
Current	1,589,645	1,343,235
Commercial Real Estate - Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
60-89 Days Past Due		139
Nonaccrual	6,499	1,873
Total Past Due	6,499	2,012
Current	128,053	86,618
Commercial Real Estate - Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	3,834	1,017
60-89 Days Past Due	1,468	27
Recorded Investment > 90 Days and Accruing	138
Nonaccrual	60,903	50,490
Total Past Due	66,343	51,534
Current	1,510,215	1,020,726
Consumer Heloc [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	577	527
60-89 Days Past Due	376	119
Nonaccrual	3,115	1,950
Total Past Due	4,068	2,596
Current	356,252	248,506
Consumer Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	3,349	3,795
60-89 Days Past Due	695	716
Recorded Investment > 90 Days and Accruing	203	89
Nonaccrual	1,261	1,562
Total Past Due	5,508	6,162
Current	841,461	614,311
Consumer - Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	969	844
60-89 Days Past Due	129	317
Recorded Investment > 90 Days and Accruing	83	100
Nonaccrual	1,527	1,806
Total Past Due	2,708	3,067
Current	100,630	96,616
Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	11,606	8,588
60-89 Days Past Due	3,959	2,823
Recorded Investment > 90 Days and Accruing	1	35
Nonaccrual	13,968	10,333
Total Past Due	29,534	21,779
Current	1,489,622	1,337,790
Covered Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	1,477	1,831
60-89 Days Past Due	584	730
Recorded Investment > 90 Days and Accruing		14
Nonaccrual	15,124	31,793
Total Past Due	17,185	34,368
Current	$130,523	$183,464

Recovered_Sheet4

Finance Receivables and Allowance for Credit Losses - Schedule of Loans by Class Modified as Troubled Debt Restructuring (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
	SecurityLoan	SecurityLoan
Financing Receivable, Modifications [Line Items]
Number of Loans	97	135
Pre-modification Outstanding Recorded Investment	$19,011	$28,391
Post-modification Outstanding Recorded Investment	19,011	28,391
Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	32	35
Pre-modification Outstanding Recorded Investment	13,696	15,155
Post-modification Outstanding Recorded Investment	13,696	15,155
Commercial Real Estate - Construction [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	1	1
Pre-modification Outstanding Recorded Investment	484	60
Post-modification Outstanding Recorded Investment	484	60
Commercial Real Estate - Other [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	34	36
Pre-modification Outstanding Recorded Investment	3,070	9,791
Post-modification Outstanding Recorded Investment	3,070	9,791
Residential [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	2	14
Pre-modification Outstanding Recorded Investment	175	1,901
Post-modification Outstanding Recorded Investment	175	1,901
Consumer - Other [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	28	49
Pre-modification Outstanding Recorded Investment	1,586	1,484
Post-modification Outstanding Recorded Investment	$1,586	$1,484

Recovered_Sheet5

Finance Receivables and Allowance for Credit Losses - Schedule of Troubled Debt Restructurings for which there was Payment Default (Detail) (Troubled Debt Restructurings that Subsequently Defaulted [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013
	SecurityLoan
Financing Receivable, Modifications [Line Items]
Number of Contracts	5
Recorded Investment	$117
Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	3
Recorded Investment	32
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	2
Recorded Investment	$85

Recovered_Sheet6

Finance Receivables and Allowance for Credit Losses - Schedule of Activity in Troubled Debt Restructurings (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Beginning balance	$48,867	$32,054
(Charge-offs)/recoveries	829	820
Payments	-28,935	-12,398
Additions	19,011	28,391
Removals - subsequent restructuring	-4,819
Ending balance	34,953	48,867
Commercial Loan [Member]
Financing Receivable, Impaired [Line Items]
Beginning balance	22,443	12,660
(Charge-offs)/recoveries	126	879
Payments	-18,281	-6,251
Additions	13,696	15,155
Removals - subsequent restructuring	-2,779
Ending balance	15,205	22,443
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Beginning balance	22,639	18,422
(Charge-offs)/recoveries	795	1
Payments	-9,722	-5,635
Additions	3,554	9,851
Removals - subsequent restructuring	-2,040
Ending balance	15,226	22,639
Consumer Loan [Member]
Financing Receivable, Impaired [Line Items]
Beginning balance	1,441	473
(Charge-offs)/recoveries	-102	-61
Payments	-466	-455
Additions	1,586	1,484
Ending balance	2,459	1,441
Residential [Member]
Financing Receivable, Impaired [Line Items]
Beginning balance	2,344	499
(Charge-offs)/recoveries	10	1
Payments	-466	-57
Additions	175	1,901
Ending balance	$2,063	$2,344

Recovered_Sheet7

Finance Receivables and Allowance for Credit Losses - Schedule of Activity of Purchased Impaired Loans (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Purchased impaired loans	$47,370	$37,145
Carrying amount, net of allowance	45,831	34,576
Allowance for loan losses	1,539	2,569
Commercial Loan [Member]
Financing Receivable, Impaired [Line Items]
Purchased impaired loans	2,770	648
Allowance for loan losses	406	429
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Purchased impaired loans	37,394	23,618
Allowance for loan losses	1,049	2,025
Consumer Loan [Member]
Financing Receivable, Impaired [Line Items]
Purchased impaired loans	7,073	12,725
Allowance for loan losses	67	80
Residential [Member]
Financing Receivable, Impaired [Line Items]
Purchased impaired loans	133	154
Allowance for loan losses	$17	$35

Recovered_Sheet8

Finance Receivables and Allowance for Credit Losses - Schedule of Accretable Yield of Noncovered Loans, or Income Expected to be Collected (Detail) (Non Covered Loans [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at January 1	$28,291
New loans purchased	8,274
Accretion of income	-15,984
Reclassifications from (to) nonaccretable difference	5,469
Disposals/other adjustments	741
Balance at December 31	26,791
Monroe Bancorp [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at January 1	6,787
Accretion of income	-2,875
Reclassifications from (to) nonaccretable difference	-1,185
Disposals/other adjustments	837
Balance at December 31	3,564
Integra Noncovered [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at January 1	2,425
Accretion of income	-823
Reclassifications from (to) nonaccretable difference	-117
Disposals/other adjustments	-96
Balance at December 31	1,389
IBT [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at January 1	19,079
Accretion of income	-10,771
Reclassifications from (to) nonaccretable difference	5,046
Balance at December 31	13,354
Tower [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
New loans purchased	4,065
Accretion of income	-984
Reclassifications from (to) nonaccretable difference	1,478
Balance at December 31	4,559
United [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
New loans purchased	1,605
Accretion of income	-336
Reclassifications from (to) nonaccretable difference	247
Balance at December 31	1,516
LSB [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
New loans purchased	2,604
Accretion of income	-195
Balance at December 31	$2,409

Recovered_Sheet9

Finance Receivables and Allowance for Credit Losses - Schedule of Receivables for Which Contractually Required Payments would not be Collected (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014
Monroe Bancorp [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractually required payments	$94,714
Nonaccretable difference	-45,157
Cash flows expected to be collected at acquisition	49,557
Accretable yield	-6,971
Fair value of acquired loans at acquisition	42,586
Integra Bank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractually required payments	921,856
Nonaccretable difference	-226,426
Cash flows expected to be collected at acquisition	695,430
Accretable yield	-98,487
Fair value of acquired loans at acquisition	596,943
IBT [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractually required payments	118,535
Nonaccretable difference	-53,165
Cash flows expected to be collected at acquisition	65,370
Accretable yield	-11,945
Fair value of acquired loans at acquisition	53,425
Tower [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractually required payments	22,746
Nonaccretable difference	-5,826
Cash flows expected to be collected at acquisition	16,920
Accretable yield	-4,065
Fair value of acquired loans at acquisition	12,855
United [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractually required payments	15,483
Nonaccretable difference	-5,487
Cash flows expected to be collected at acquisition	9,996
Accretable yield	-1,605
Fair value of acquired loans at acquisition	8,391
LSB [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractually required payments	24,493
Nonaccretable difference	-9,903
Cash flows expected to be collected at acquisition	14,590
Accretable yield	-2,604
Fair value of acquired loans at acquisition	$11,986

Covered_Loans_Composition_of_C

Covered Loans - Composition of Covered Loans by Lending Classification (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Covered Loans [Line Items]
Covered loans	$147,708	$217,832
Allowance for loan losses	-3,552	-5,404
Covered loans, net	144,156
Commercial Loans [Member]
Covered Loans [Line Items]
Covered loans	17,167
Commercial Real Estate Loan [Member]
Covered Loans [Line Items]
Covered loans	40,797
Residential [Member]
Covered Loans [Line Items]
Covered loans	21,254
Consumer [Member]
Covered Loans [Line Items]
Covered loans	68,490
Loans Accounted for Under ASC 310-30 (Purchased Credit Impaired) [Member]
Covered Loans [Line Items]
Covered loans	78,157
Allowance for loan losses	-1,104
Covered loans, net	77,053
Loans Accounted for Under ASC 310-30 (Purchased Credit Impaired) [Member] \| Commercial Loans [Member]
Covered Loans [Line Items]
Covered loans	7,160
Loans Accounted for Under ASC 310-30 (Purchased Credit Impaired) [Member] \| Commercial Real Estate Loan [Member]
Covered Loans [Line Items]
Covered loans	37,384
Loans Accounted for Under ASC 310-30 (Purchased Credit Impaired) [Member] \| Residential [Member]
Covered Loans [Line Items]
Covered loans	21,106
Loans Accounted for Under ASC 310-30 (Purchased Credit Impaired) [Member] \| Consumer [Member]
Covered Loans [Line Items]
Covered loans	12,507
Loans Excluded from ASC 310-30 (1) (Not Purchased Credit Impaired) [Member]
Covered Loans [Line Items]
Covered loans	69,551
Allowance for loan losses	-2,448
Covered loans, net	67,103
Loans Excluded from ASC 310-30 (1) (Not Purchased Credit Impaired) [Member] \| Commercial Loans [Member]
Covered Loans [Line Items]
Covered loans	10,007
Loans Excluded from ASC 310-30 (1) (Not Purchased Credit Impaired) [Member] \| Commercial Real Estate Loan [Member]
Covered Loans [Line Items]
Covered loans	3,413
Loans Excluded from ASC 310-30 (1) (Not Purchased Credit Impaired) [Member] \| Residential [Member]
Covered Loans [Line Items]
Covered loans	148
Loans Excluded from ASC 310-30 (1) (Not Purchased Credit Impaired) [Member] \| Consumer [Member]
Covered Loans [Line Items]
Covered loans	$55,983

Covered_Loans_Additional_Infor

Covered Loans - Additional Information (Detail) (USD $)	12 Months Ended
Covered Loans - Additional Information (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Covered Loans [Line Items]
Allowance for loan losses related to the acquired loans	$0
Outstanding covered loans including principal, interest, fees and penalties	47,370,000	37,145,000
Covered loans	147,708,000	217,832,000
Percentage of prospective yield adjustments offset	80.00%
Loss sharing asset	20,603,000	88,513,000	116,624,000
Loss sharing asset, FDIC indemnification asset	18,500,000
Loss sharing asset, loss share receivable	2,100,000
Percentage of increase in indemnification asset measured as a result of impairment	80.00%
Covered Loans [Member]
Covered Loans [Line Items]
Outstanding covered loans including principal, interest, fees and penalties	241,900,000	406,300,000
Covered loans	147,708,000	217,832,000
Expected Indemnification Payments [Member]
Covered Loans [Line Items]
Loss sharing asset, FDIC indemnification asset	8,800,000	41,500,000
To Be Amortized Against Future Accreted Interest Income [Member]
Covered Loans [Line Items]
Loss sharing asset, FDIC indemnification asset	$9,700,000	$32,200,000

Covered_Loans_Schedule_of_Acqu

Covered Loans - Schedule of Acquired Impaired Loans (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Impaired Loans By Type [Line Items]
Beginning balance	$131,038	$247,752
Principal reductions and interest payments	-112,339	-144,512
Accretion of loan discount	61,945	35,363
Changes in contractual and expected cash flows due to remeasurement	2,690	1,574
Removals due to foreclosure or sale	-6,281	-9,139
Ending balance	77,053	131,038
Contractual Cash Flows [Member]
Impaired Loans By Type [Line Items]
Beginning balance	251,042	424,527
Principal reductions and interest payments	-109,254	-144,512
Changes in contractual and expected cash flows due to remeasurement	-9,935	-20,242
Removals due to foreclosure or sale	-7,044	-8,731
Ending balance	124,809	251,042
Non Accretable Difference [Member]
Impaired Loans By Type [Line Items]
Beginning balance	-46,793	-90,996
Principal reductions and interest payments	-2,145
Changes in contractual and expected cash flows due to remeasurement	34,692	43,424
Removals due to foreclosure or sale	2,232	779
Ending balance	-12,014	-46,793
Accretable Yield [Member]
Impaired Loans By Type [Line Items]
Beginning balance	-73,211	-85,779
Principal reductions and interest payments	-940
Accretion of loan discount	61,945	35,363
Changes in contractual and expected cash flows due to remeasurement	-22,067	-21,608
Removals due to foreclosure or sale	-1,469	-1,187
Ending balance	($35,742)	($73,211)

Covered_Loans_Schedule_of_Accr

Covered Loans - Schedule of Accretable Yield, or Income Expected to be Collected (Detail) (Covered Loans [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Covered Loans [Member]
Covered Loans [Line Items]
Balance at January 1	$73,211	$85,779
Accretion of income	-61,945	-35,363
Reclassifications from (to) nonaccretable difference	22,067	21,608
Disposals/other adjustments	2,409	1,187
Balance at December 31	$35,742	$73,211

Covered_Loans_Summary_of_FDIC_

Covered Loans - Summary of FDIC Loss Sharing Asset (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Covered Loans [Line Items]
Beginning balance	$88,513	$116,624
Cash received from the FDIC	-26,342	-19,527	-48,223
Ending balance	20,603	88,513	116,624
Adjustments Not Reflected in Income [Member]
Covered Loans [Line Items]
Cash received from the FDIC	-26,342	-19,527
Other	1,594	704
Adjustments Reflected in Income [Member]
Covered Loans [Line Items]
(Amortization) accretion	-41,611	-10,072
Impairment	59	32
Write-downs/sale of other real estate	-1,610	1,933
Recovery amounts due to FDIC		-1,243
Other		$62

Other_Real_Estate_Owned_Activi

Other Real Estate Owned - Activity in Other Real Estate Owned (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Real Estate Properties [Line Items]
Ending balance	$7,241	$7,562
Other Real Estate Owned [Member]
Real Estate Properties [Line Items]
Beginning Balance	7,562	11,179
Additions	7,064	7,278
Sales	-5,856	-9,316
Gains (losses)/Write-downs	-1,529	-1,579
Ending balance	7,241	7,562
Other Real Estate Owned, Covered [Member]
Real Estate Properties [Line Items]
Beginning Balance	13,670	26,137
Additions	8,480	6,368
Sales	-11,164	-14,813
Gains (losses)/Write-downs	-1,865	-4,022
Ending balance	$9,121	$13,670

Other_Real_Estate_Owned_Activi1

Other Real Estate Owned - Activity in Other Real Estate Owned (Parenthetical) (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Regulatory Assets [Abstract]
Repossessed personal property	$0.20	$0.30

Other_Real_Estate_Owned_Additi

Other Real Estate Owned - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
Real Estate Properties [Line Items]
Percentage covered up to $467.2 million	0.00%
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%
Losses in Excess of $275.0 up to $467.2 [Member]
Real Estate Properties [Line Items]
Zero percent for losses on acquisition	467.2
Losses in Excess of $467.2 [Member]
Real Estate Properties [Line Items]
Loss sharing agreements amount, 80% on assets acquired	$467.20
Loss sharing reimbursement threshold	80.00%

Goodwill_and_Other_Intangible_2

Goodwill and Other Intangible Assets - Schedule of Changes in Carrying Amount of Goodwill (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Goodwill [Line Items]
Beginning balance	$352,729	$338,820
Goodwill acquired during the period	178,116	13,909
Ending balance	530,845	352,729
Banking [Member]
Goodwill [Line Items]
Beginning balance	312,856	298,947
Goodwill acquired during the period	178,116	13,909
Ending balance	490,972	312,856
Insurance [Member]
Goodwill [Line Items]
Beginning balance	39,873	39,873
Goodwill acquired during the period
Ending balance	$39,873	$39,873

Goodwill_and_Other_Intangible_3

Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended			3 Months Ended			0 Months Ended	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2013	Jul. 12, 2013	Sep. 30, 2013	Jun. 30, 2014	Dec. 31, 2013
	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2013	Branch	Branch	Jun. 30, 2014	Dec. 31, 2013
Goodwill [Line Items]
Goodwill acquired during the period		$178,116,000	$13,909,000
Goodwill		530,845,000	352,729,000	338,820,000	530,845,000						352,729,000
Amortization expense of other intangible assets	600,000	9,120,000	8,162,000	7,941,000
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
Banking [Member]
Goodwill [Line Items]
Goodwill acquired during the period		178,116,000	13,909,000
Goodwill		490,972,000	312,856,000	298,947,000	490,972,000						312,856,000
Amortization expense of other intangible assets		7,507,000	6,489,000	6,100,000
Insurance [Member]
Goodwill [Line Items]
Goodwill acquired during the period
Goodwill		39,873,000	39,873,000	39,873,000	39,873,000						39,873,000
Amortization expense of other intangible assets		1,613,000	1,673,000	1,841,000
LSB Financial Corp. [Member]
Goodwill [Line Items]
Goodwill		39,960,000			39,960,000
LSB Financial Corp. [Member] \| Banking [Member]
Goodwill [Line Items]
Goodwill acquired during the period					40,000,000
Core deposit intangibles		2,600,000			2,600,000
United Bancorp, Inc. [Member]
Goodwill [Line Items]
Goodwill acquired during the period						82,000,000
Goodwill		81,952,000			81,952,000
United Bancorp, Inc. [Member] \| Banking [Member]
Goodwill [Line Items]
Core deposit intangibles						5,900,000
United Bancorp, Inc. [Member] \| Banking [Member] \| Trust Customer Relationship Intangible [Member]
Goodwill [Line Items]
Increase (decrease) in customer business relationship						4,900,000
Indiana Community Bancorp [Member]
Goodwill [Line Items]
Goodwill							86,200,000
Indiana Community Bancorp [Member] \| Banking [Member]
Goodwill [Line Items]
Goodwill acquired during the period							600,000
Bank of America [Member]
Goodwill [Line Items]
Number of branches acquired								24
Goodwill										13,347,000
Bank of America [Member] \| Banking [Member]
Goodwill [Line Items]
Goodwill acquired during the period									13,300,000
Number of branches acquired									24
Core deposit intangibles									3,500,000
Number of retail bank branches									24
Tower Financial Corporation [Member]
Goodwill [Line Items]
Goodwill acquired during the period										56,200,000
Goodwill		56,203,000			56,203,000
Tower Financial Corporation [Member] \| Banking [Member]
Goodwill [Line Items]
Core deposit intangibles										4,600,000
Tower Financial Corporation [Member] \| Banking [Member] \| Trust Customer Relationship Intangible [Member]
Goodwill [Line Items]
Increase (decrease) in customer business relationship										3,800,000
Insurance Book of Business [Member] \| Insurance [Member] \| Customer Business Relationships [Member]
Goodwill [Line Items]
Increase (decrease) in customer business relationship					200,000					300,000	1,300,000
Insurance Book of Business [Member] \| Insurance [Member] \| Customer Business Relationships [Member] \| Purchase [Member]
Goodwill [Line Items]
Increase (decrease) in customer business relationship							100,000
Insurance Book of Business [Member] \| Insurance [Member] \| Customer Business Relationships [Member] \| Sales [Member]
Goodwill [Line Items]
Increase (decrease) in customer business relationship							$100,000

Goodwill_and_Other_Intangible_4

Goodwill and Other Intangible Assets - Schedule of Gross Carrying Amount and Accumulated Amortization of Other Intangible Assets (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$103,490	$81,634
Accumulated Amortization and Impairment	-64,796	-55,677
Net Carrying Amount	38,694	25,957
Core Deposit Intangible [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	57,149	44,021
Accumulated Amortization and Impairment	-36,950	-31,266
Net Carrying Amount	20,199	12,755
Customer Business Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	27,942	27,848
Accumulated Amortization and Impairment	-21,438	-19,826
Net Carrying Amount	6,504	8,022
Trust Customer Relationship Intangible [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	13,986	5,352
Accumulated Amortization and Impairment	-3,232	-1,810
Net Carrying Amount	10,754	3,542
Customer Loan Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,413	4,413
Accumulated Amortization and Impairment	-3,176	-2,775
Net Carrying Amount	$1,237	$1,638

Goodwill_and_Other_Intangible_5

Goodwill and Other Intangible Assets - Schedule of Estimated Amortization Expense for Future Years (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]
2015	$10,118
2016	8,381
2017	6,287
2018	4,743
2019	3,491
Thereafter	5,674
Net Carrying Amount	$38,694	$25,957

Loan_Servicing_Rights_Addition

Loan Servicing Rights - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Nov. 01, 2014	Jul. 31, 2014
Transfers and Servicing [Abstract]
Fair value of loan servicing rights	$9,500,000	$1,000,000	$9,000,000
Loan servicing rights	9,534,000
Principal balance of loans serviced for others	1,100,000,000
Funds held in escrow	$16,500,000
Percentage of mortgage loan	95.00%
Fair value at discount rate	12.00%
Fair Value Inputs Weighted Average Prepayment Speed	192.00%

Loan_Servicing_Rights_Componen

Loan Servicing Rights - Components of Loan Servicing Rights and Valuation Allowance (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014
Transfers and Servicing [Abstract]
Additions	$10,310
Amortization	-726
Ending balance	9,584
Valuation allowance:
Additions	-50
Ending balance	-50
Loan servicing rights, net	$9,534

Deposits_Additional_Informatio

Deposits - Additional Information (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Maturities of Time Deposits [Abstract]
Time deposits, $250,000 or more, total	$80.70	$58.50

Deposits_Schedule_of_Maturitie

Deposits - Schedule of Maturities of Total Time Deposits (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Maturities of Time Deposits [Abstract]
Due in 2015	$601,243
Due in 2016	257,087
Due in 2017	98,146
Due in 2018	59,874
Due in 2019	46,822
Thereafter	25,846
Total time deposits	$1,089,018	$1,017,975

ShortTerm_Borrowings_Schedule_

Short-Term Borrowings - Schedule of Short-Term Borrowings and Weighted-Average Interest Rates (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Short-term Debt [Line Items]
Outstanding at end of period	$551,309	$462,332
Average amount outstanding	404,919	517,653
Weighted average interest rate during period	0.08%	0.12%
Weighted average interest rate at end of period	0.09%	0.09%
Federal Funds Purchased [Member]
Short-term Debt [Line Items]
Outstanding at end of period	195,188	115,103
Average amount outstanding	77,512	176,033
Maximum amount outstanding at any month-end	195,188	466,861
Weighted average interest rate during period	0.23%	0.22%
Weighted average interest rate at end of period	0.17%	0.20%
Repurchase Agreements / Sweeps [Member]
Short-term Debt [Line Items]
Outstanding at end of period	356,121	347,229
Average amount outstanding	327,407	341,620
Maximum amount outstanding at any month-end	$356,121	$425,191
Weighted average interest rate during period	0.07%	0.07%
Weighted average interest rate at end of period	0.05%	0.05%

Financing_Activities_Other_Bor

Financing Activities - Other Borrowings (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Aug. 31, 2014
Debt Instrument [Line Items]
ASC 815 fair value hedge and other basis adjustments	($3,984)
Total other borrowings	920,102	556,388
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]
ASC 815 fair value hedge and other basis adjustments	-4,884	-3,262
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
Old National Bancorp [Member] \| Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Junior subordinated debentures (variable rates 1.58% to 1.99%) maturing March 2035 to June 2037	45,000	28,000
Old National Bank [Member]
Debt Instrument [Line Items]
Securities sold under agreements to repurchase (fixed rates 2.47% to 2.50%) maturing January 2017 to January 2018	50,000	50,000
Federal Home Loan Bank advances (fixed rates 0.19% to 6.76% and variable rates 0.31% to 0.34%) maturing January 2015 to May 2024	649,987	477,856
Capital lease obligation	4,099	4,157
ASC 815 fair value hedge and other basis adjustments	$900	($363)

Financing_Activities_Other_Bor1

Financing Activities - Other Borrowings (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2014	Aug. 31, 2014
Old National Bancorp [Member]
Debt Instrument [Line Items]
Maturity, Start date	1-Mar-35
Maturity, End date	1-Jun-37
Old National Bank [Member]
Debt Instrument [Line Items]
Maturity, Start date	1-Jan-15
Maturity, End date	1-May-24
Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Fixed rates		4.13%
Maturity date	15-Aug-24
Senior Unsecured Notes [Member] \| Old National Bancorp [Member]
Debt Instrument [Line Items]
Fixed rates	4.13%
Maturity date	15-Aug-24
Securities Sold under Agreements to Repurchase [Member] \| Old National Bank [Member]
Debt Instrument [Line Items]
Maturity, Start date	1-Jan-17
Maturity, End date	1-Jan-18
Minimum [Member] \| Junior Subordinated Debt [Member] \| Old National Bancorp [Member]
Debt Instrument [Line Items]
Variable rates	1.58%
Minimum [Member] \| Securities Sold under Agreements to Repurchase [Member] \| Old National Bank [Member]
Debt Instrument [Line Items]
Fixed rates	2.47%
Minimum [Member] \| Federal Home Loan Bank Advances [Member] \| Old National Bank [Member]
Debt Instrument [Line Items]
Fixed rates	0.19%
Variable rates	0.31%
Maximum [Member] \| Junior Subordinated Debt [Member] \| Old National Bancorp [Member]
Debt Instrument [Line Items]
Variable rates	1.99%
Maximum [Member] \| Securities Sold under Agreements to Repurchase [Member] \| Old National Bank [Member]
Debt Instrument [Line Items]
Fixed rates	2.50%
Maximum [Member] \| Federal Home Loan Bank Advances [Member] \| Old National Bank [Member]
Debt Instrument [Line Items]
Fixed rates	6.76%
Variable rates	0.34%

Financing_Activities_Contractu

Financing Activities - Contractual Maturities of Long-Term Debt (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014
Debt Disclosure [Abstract]
Due in 2015	$200,063
Due in 2016	117,376
Due in 2017	45,909
Due in 2018	195,516
Due in 2019	3,307
Thereafter	361,915
ASC 815 fair value hedge and other basis adjustments	-3,984
Total	$920,102

Financing_Activities_Additiona

Financing Activities - Additional Information (Detail) (USD $)

12 Months Ended

3 Months Ended

0 Months Ended

Dec. 31, 2014

Dec. 31, 2013

Mar. 31, 2013

Mar. 31, 2010

Oct. 07, 2011

Jun. 15, 2012

Sep. 30, 2006

Dec. 31, 2005

Dec. 31, 2006

Aug. 31, 2014

Mar. 31, 2005

Jul. 31, 2006

Mar. 31, 2007

Item

Debt Instrument [Line Items]

Loss on extinguishment of debt

$1,000,000

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

Federal Home Loan Bank Advances [Member]

Debt Instrument [Line Items]

Weighted-average rates of Federal Home Loan Bank advances

0.77%

0.94%

Percentage of borrowings collateralized by investment securities and residential real estate loans

149.00%

Extinguishment of debt amount

50,000,000

Advances from Federal Home Loan Banks restructured

33,400,000

Federal Home Loan Bank Advance One [Member] | Pre Restructuring [Member]

Debt Instrument [Line Items]

FHLB advances effective interest rate

3.27%

Federal Home Loan Bank Advance One [Member] | Post Restructuring [Member]

Debt Instrument [Line Items]

FHLB advances effective interest rate

2.04%

Federal Home Loan Bank Advance Two [Member] | Pre Restructuring [Member]

Debt Instrument [Line Items]

FHLB advances effective interest rate

3.29%

Federal Home Loan Bank Advance Two [Member] | Post Restructuring [Member]

Debt Instrument [Line Items]

FHLB advances effective interest rate

2.49%

Senior Unsecured Notes [Member]

Debt Instrument [Line Items]

Senior unsecured notes

175,000,000

Fixed rate

4.13%

Maturity date

15-Aug-24

St Joseph Capital Trust II [Member]

Debt Instrument [Line Items]

Maturity date

17-Mar-35

Preferred securities

5,000,000

Cumulative annual distribution rate of preferred securities

6.27%

Reference rate of the variable interest rate for preferred securities

Three-month LIBOR plus 175 basis points

LIBOR rate

1.75%

Monroe Bancorp Capital Trust I [Member]

Debt Instrument [Line Items]

Preferred securities

3,000,000

Fixed rate of interest of preferred securities

7.15%

Monroe Bancorp Statutory Trust II [Member]

Debt Instrument [Line Items]

Preferred securities

5,000,000

Reference rate of the variable interest rate for preferred securities

Three-month LIBOR plus 160 basis points

LIBOR rate

1.60%

Fixed rate of interest of preferred securities

6.52%

Home Federal Statutory Trust I [Member]

Debt Instrument [Line Items]

Preferred securities

15,000,000

Reference rate of the variable interest rate for preferred securities

Three-month LIBOR plus 165 basis points

LIBOR rate

1.65%

Tower Capital Trust 2 [Member]

Debt Instrument [Line Items]

Preferred securities

8,000,000

Reference rate of the variable interest rate for preferred securities

Three-month LIBOR plus 134 basis points

LIBOR rate

1.34%

Tower Capital Trust 3 [Member]

Debt Instrument [Line Items]

Preferred securities

$9,000,000

Reference rate of the variable interest rate for preferred securities

Three-month LIBOR plus 169 basis

LIBOR rate

1.69%

Financing_Activities_Future_Mi

Financing Activities - Future Minimum Lease Payments under Capital Lease (Detail) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified	Dec. 31, 2014
Debt Disclosure [Abstract]
2015	$410
2016	410
2017	410
2018	410
2019	429
Thereafter	8,836
Total minimum lease payments	10,905
Less amounts representing interest	6,806
Present value of net minimum lease payments	$4,099

Income_Taxes_Summary_of_Differ

Income Taxes - Summary of Differences in Taxes from Continuing Operations Computed at Statutory Rate (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Provision at statutory rate of 35%									$49,688	$49,881	$44,725
Tax-exempt interest									-11,460	-10,125	-8,590
Section 291/265 interest disallowance									93	107	147
Bank owned life insurance income									-2,423	-2,609	-2,258
Tax-exempt income									-13,790	-12,627	-10,701
Reserve for unrecognized tax benefits									-1,076	-381	-292
State income taxes									2,676	3,386	3,409
State statutory rate change									904	1,257
Other, net									-105	81	-1,031
Income tax expense	$10,302	$11,095	$7,658	$9,242	$10,602	$6,869	$13,734	$10,392	$38,297	$41,597	$36,110
Effective tax rate									27.00%	29.20%	28.30%

Income_Taxes_Summary_of_Differ1

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

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended				12 Months Ended
Income Taxes - Additional Information (Detail) (USD $)	Mar. 31, 2014	Sep. 30, 2013	Jun. 30, 2013	Sep. 30, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Line Items]
Increase in Income tax expense related to statutory rate	$900,000		$1,300,000
Valuation allowance recorded					0	0
Operating loss carryforwards, federal					4,000,000	6,600,000
AMT carryforwards					19,808,000	21,268,000
Federal tax credits					1,632,000	422,000
Operating loss carryforwards, state					53,500,000	32,300,000
Operating loss carryforwards, expiration date					2022
Federal tax credits expiration date					2030
Unrecognized tax benefits, if recognized, would favorably affect the effective tax rate					80,000
Uncertain tax position reversal		400,000		300,000	3,807,000	140,000	194,000
Interest and penalties					-1,100,000	-200,000	-100,000
Interest and penalties, accrued					10,000	1,100,000
Interest portion of uncertain tax position reversal		$200,000		$100,000
Federal Net Operating Loss [Member]
Income Taxes [Line Items]
Operating loss carryforwards, expiration date					2032

Income_Taxes_Provision_for_Def

Income Taxes - Provision for Deferred Income Taxes (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Federal income taxes currently payable									$8,974	$13,901	$21,015
State income taxes currently payable									581	-51	1,975
Federal income taxes deferred									27,207	22,983	11,052
State income taxes deferred									1,535	4,764	2,068
Deferred income tax expense									28,742	27,747	13,120
Income tax expense	$10,302	$11,095	$7,658	$9,242	$10,602	$6,869	$13,734	$10,392	$38,297	$41,597	$36,110

Income_Taxes_Schedule_of_Signi

Income Taxes - Schedule of Significant Components of Net Deferred Tax Assets (Liabilities) (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred Tax Assets
Allowance for loan losses, net of recapture	$16,348	$16,891
Benefit plan accruals	16,683	15,331
AMT credit	19,808	21,268
Unrealized losses on benefit plans	5,648	4,011
Net operating loss carryforwards	3,258	3,763
Premises and equipment	20,139	24,221
Federal tax credits	1,632	422
Other-than-temporary-impairment	3,573	4,939
Acquired loans	49,350	51,546
Lease exit obligation	1,747	2,654
Unrealized losses on available-for-sale investment securities	1,815	13,276
Unrealized losses on held-to-maturity investment securities	8,120	8,567
Unrealized losses on hedges	3,638	116
Other, net	6,324	5,406
Total deferred tax assets	158,083	172,411
Deferred Tax Liabilities
Accretion on investment securities	-449	-438
Lease receivable, net		-395
Other real estate owned	-178	-701
Purchase accounting	-15,112	-7,355
FDIC indemnification asset	-6,909	-27,938
Loan servicing rights	-3,558
Other, net	-2,530	-2,028
Total deferred tax liabilities	-28,736	-38,855
Net deferred tax assets	$129,347	$133,556

Income_Taxes_Summary_of_Reconc

Income Taxes - Summary of Reconciliation of Unrecognized Tax Benefits (Detail) (USD $)	3 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Balance at January 1			$3,847	$3,953	$4,145
Additions based on tax positions related to the current year			37	34	2
Reductions due to statute of limitations expiring	-400	-300	-3,807	-140	-194
Balance at December 31			$77	$3,847	$3,953

Employee_Benefit_Plans_Additio

Employee Benefit Plans - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
Share data in Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Retirement benefits based on years of service and compensation		5 years
Estimated net loss from defined benefit plan, that will be amortized into periodic costs		$2,100,000
Accumulated benefit obligation and projected benefit obligation		46,400,000	41,300,000
Expected cash contribution		700,000
Termination liability	14,000,000
Contribution plan, employer matching contribution percentage		50.00%
Defined contribution plans employee contribution percentage of eligible compensation matched by employer		6.00%
Discretionary profit sharing		0	0	0
Shares allocated to the employee stock ownership plan		1.2	1.3	1.4
Contribution expense under employee stock ownership plan		$4,300,000	$3,800,000	$3,400,000
Equity Securities [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Asses allocation target, current year, minimum		40.00%
Asses allocation target, current year, maximum		70.00%
Debt Securities [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Asses allocation target, current year, minimum		30.00%
Asses allocation target, current year, maximum		60.00%
Cash and Cash Equivalents [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Asses allocation target, current year, minimum		0.00%
Asses allocation target, current year, maximum		15.00%

Employee_Benefit_Plans_Summary

Employee Benefit Plans - Summary of Defined Benefit Plans Combined Activity (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation, Beginning Balance	$41,300
Benefit Obligation, Interest cost	1,754	1,740	1,971
Benefit Obligation, Actuarial loss (gain)	-1,316	-2,318	-4,027
Plan Assets, Settlement	-617	-1,118	-1,170
Defined Benefit Plan, Benefit Obligation, Ending Balance	46,400	41,300
Accrued benefit liability	-8,753	-3,405
Net amount recognized	-8,753	-3,405
Net actuarial loss	14,863	10,530
Amount Recognized in OCI, Total	14,863	10,530
Change in Projected Benefit Obligation [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation, Beginning Balance	41,321	48,728
Benefit Obligation, Interest cost	1,754	1,740
Plan Assets, Benefits paid	-931	-942
Benefit Obligation, Actuarial loss (gain)	6,287	-3,783
Plan Assets, Settlement	-1,985	-4,422
Defined Benefit Plan, Benefit Obligation, Ending Balance	46,446	41,321
Change in Plan Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance	37,916	37,550
Plan Assets, Actual return on plan assets	2,260	5,320
Plan Assets, Employer contributions	433	410
Plan Assets, Benefits paid	-931	-942
Plan Assets, Settlement	-1,985	-4,422
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance	37,693	37,916
Funded status at December 31	($8,753)	($3,405)

Employee_Benefit_Plans_Schedul

Employee Benefit Plans - Schedule of Net Periodic Benefit Cost (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]
Benefit Cost, Interest cost	$1,754	$1,740	$1,971
Benefit Cost, Expected return on plan assets	-2,239	-2,202	-2,345
Benefit Cost, Recognized actuarial loss	1,316	2,318	4,027
Benefit Cost, Net periodic benefit cost	831	1,856	3,653
Benefit Cost, Settlement cost	617	1,118	1,170
Total net periodic benefit cost	1,448	2,974	4,823
Other Changes, Net actuarial (gain)/loss	6,266	-6,901	1,903
Other Changes, Amortization of net actuarial loss	-1,316	-2,318	-4,027
Other Changes, Settlement cost	-617	-1,118	-1,170
Total recognized in other comprehensive income	4,333	-10,337	-3,294
Total recognized in net periodic benefit cost and other comprehensive income	$5,781	($7,363)	$1,529

Employee_Benefit_Plans_Assumpt

Employee Benefit Plans - Assumptions Used in Determining the Benefit Obligations and Net Periodic Benefit Expense Income (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Benefit obligations, Discount rate at the end of the period	4.00%	4.75%	4.00%
Net periodic benefit cost, Discount rate at the beginning of the period	4.75%	4.00%	4.55%
Net periodic benefit cost, Expected return on plan assets	7.50%	7.50%	7.50%
Rate of compensation increase	0.00%	0.00%	0.00%

Employee_Benefit_Plans_Asset_A

Employee Benefit Plans - Asset Allocation of Retirement Plan (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations	100.00%	100.00%	100.00%
Equity Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Expected Long-Term Rate of Return, Equity securities, Minimum	9.00%
Expected Long-Term Rate of Return, Equity securities, Maximum	9.50%
Asses allocation target, current year, minimum	40.00%
Asses allocation target, current year, maximum	70.00%
Defined Benefit Plan, Actual Plan Asset Allocations	61.00%	64.00%	61.00%
Debt Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Expected Long-Term Rate of Return, Debt securities, Minimum	4.00%
Expected Long-Term Rate of Return, Debt securities, Maximum	5.85%
Asses allocation target, current year, minimum	30.00%
Asses allocation target, current year, maximum	60.00%
Defined Benefit Plan, Actual Plan Asset Allocations	38.00%	35.00%	38.00%
Cash and Cash Equivalents [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Expected Long-Term Rate of Return, Cash equivalents
Asses allocation target, current year, minimum	0.00%
Asses allocation target, current year, maximum	15.00%
Defined Benefit Plan, Actual Plan Asset Allocations	1.00%	1.00%	1.00%

Employee_Benefit_Plans_Pension

Employee Benefit Plans - Pension Plan Assets at Fair Value (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Carrying Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	$37,693	$37,916
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	14,245	13,449
Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	23,448	24,467
Large U.S. Equity [Member] \| Carrying Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	15,877	16,245
Large U.S. Equity [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	15,877	16,245
International Equity [Member] \| Carrying Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	7,103	8,120
International Equity [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	7,103	8,120
Short-Term Fixed Income [Member] \| Carrying Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	468	102
Short-Term Fixed Income [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	468	102
Fixed Income [Member] \| Carrying Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	14,245	13,449
Fixed Income [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	$14,245	$13,449

Employee_Benefit_Plans_Expecte

Employee Benefit Plans - Expected Benefit Payments (Detail) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified	Dec. 31, 2014
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
2015	$9,830
2016	4,390
2017	5,060
2018	3,060
2019	3,760
Years 2020 - 2024	$14,330

StockBased_Compensation_Additi

Stock-Based Compensation - Additional Information (Detail) (USD $)	12 Months Ended			1 Months Ended	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jul. 31, 2014	Dec. 31, 2012	Sep. 15, 2012	Apr. 25, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares available for issuance	5,200,000
Stock based compensation expense	$4,200,000	$4,000,000	$3,300,000
Total income tax benefit, stock-based compensation cost	1,600,000	1,600,000	1,300,000
Options Outstanding	1,462,000	1,344,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term, in years	10 years
Minimum [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation awards, vesting period	3 years
Maximum [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation awards, vesting period	5 years
United Bancorp, Inc. [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding				300,000
Indiana Community Bancorp [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding						200,000
Old National Bancorp [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding				200,000		300,000	37,000
Tower Financial Corporation [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding							22,000
Stock Appreciation Rights (SARs) [Member] \| United Bancorp, Inc. [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted during period				200,000
Stock Appreciation Rights (SARs) [Member] \| Old National Bancorp [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted during period				200,000
Incremental expense associated with conversion of stock appreciation rights				0
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	2,500,000
Expected weighted-average period for cost recognition (in years)	2 years 1 month 6 days
Total fair value of shares vested	1,300,000	1,400,000	1,900,000
Reversal of compensation expense			400,000
Restricted Stock Awards [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation awards, vesting period	3 years
Restricted Stock Awards [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation awards, vesting period	5 years
Restricted Stock Awards [Member] \| Indiana Community Bancorp [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested stock awards						15,000
Restricted Stock Awards [Member] \| Old National Bancorp [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense					23,000
Restricted Stock Awards [Member] \| Old National Bancorp [Member] \| Indiana Community Bancorp [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested stock awards						29,000
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	2,900,000
Expected weighted-average period for cost recognition (in years)	1 year 8 months 12 days
Decrease in expense related to performance based restricted stock grants vesting expectations	300,000	200,000
Increase in expense related to performance based restricted stock grants vesting expectations			$200,000

StockBased_Compensation_Summar

Stock-Based Compensation - Summary of Changes in the Nonvested Restricted Shares (Detail) (Restricted Stock [Member], USD $)	12 Months Ended
	Dec. 31, 2014
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested shares, Number Outstanding, Beginning balance	172,000
Nonvested shares, Granted, Number Outstanding	196,000
Nonvested shares, Vested, Number Outstanding	-90,000
Nonvested shares, Forfeited, Number Outstanding	-2,000
Nonvested shares, Number Outstanding, Ending balance	276,000
Nonvested shares, Weighted Average Grant-Date Fair Value, Beginning of Period	$12.44
Nonvested shares, Granted, Weighted Average Grant-Date Fair Value	$14.15
Nonvested shares, Vested, Weighted Average Grant-Date Fair Value	$12.13
Nonvested shares, Forfeited, Weighted Average Grant-Date Fair Value	$13.96
Nonvested shares, Weighted Average Grant-Date Fair Value, Ending of Period	$13.74

StockBased_Compensation_Summar1

Stock-Based Compensation - Summary of Changes in the Nonvested Restricted Stock Units (Detail) (Restricted Stock Units [Member], USD $)	12 Months Ended
	Dec. 31, 2014
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested shares, Number Outstanding, Beginning balance	711,000
Nonvested shares, Granted, Number Outstanding	260,000
Nonvested shares, Vested, Number Outstanding	-174,000
Nonvested shares, Forfeited, Number Outstanding	0
Nonvested Shares, Reinvested dividend equivalents, Number Outstanding	22,000
Nonvested shares, Number Outstanding, Ending balance	819,000
Nonvested shares, Weighted Average Grant-Date Fair Value, Beginning of Period	$11.87
Nonvested shares, Granted, Weighted Average Grant-Date Fair Value	$12.46
Nonvested shares, Vested, Weighted Average Grant-Date Fair Value	$12.21
Nonvested shares, Forfeited, Weighted Average Grant-Date Fair Value	$0
Nonvested shares, Reinvested dividend equivalents, Weighted Average Grant-Date Fair Value	$12.28
Nonvested shares, Weighted Average Grant-Date Fair Value, Ending of Period	$12.02

StockBased_Compensation_Summar2

Stock-Based Compensation - Summary of the Activity in the Stock Option Plan (Detail) (USD $)	12 Months Ended
Share data in Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014
Stock Based Compensation [Abstract]
Outstanding, Shares, Beginning Balance	1,344
Granted, Shares	0
Acquired, Shares	431
Exercised, Shares	-105
Forfeited/expired, Shares	-208
Outstanding, Shares, Ending Balance	1,462
Options exercisable at end of year, Shares	1,462
Weighted Average Exercise Price, Beginning of Period	$16.96
Granted, Weighted Average Exercise Price	$0
Acquired, Weighted Average Exercise Price	$14.84
Exercised, Weighted Average Exercise Price	$10.17
Forfeited/expired, Weighted Average Exercise Price	$20.61
Weighted Average Exercise Price, End of Period	$16.30
Options exercisable at end of year, Weighted Average Exercise Price	$16.30
Weighted Average Remaining Contractual Term in Years, End of Period	2 years 8 months 1 day
Options exercisable at end of year, Weighted Average Remaining Contractual Terms in Years	2 years 8 months 1 day
Aggregate Intrinsic Value, End of Period	$2,509,400
Options exercisable at end of year, Aggregate Intrinsic Value	$2,506,400

StockBased_Compensation_Schedu

Stock-Based Compensation - Schedule of Information Related to the Stock Option Plan (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock Based Compensation [Abstract]
Intrinsic value of options exercised	$432	$282	$256
Cash received from option exercises	1,002	1,159	716
Tax benefit realized from option exercises	$97	$45	$72

Outside_Director_Stock_Compens1

Outside Director Stock Compensation Program - Additional Information (Detail)	Dec. 31, 2014
Outside Director Stock Compensation Program [Line Items]
Program stock shares available for issuance	5,200,000
Outside Director Stock Compensation Program [Member]
Outside Director Stock Compensation Program [Line Items]
Shares, issued	118,678
Outside Director Stock Compensation Program [Member] \| Maximum [Member]
Outside Director Stock Compensation Program [Line Items]
Program stock shares available for issuance	165,375

Shareholders_Equity_Additional

Shareholders' Equity - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Aug. 16, 2012
Shareholders' Equity [Line Items]
Authorized and unissued common shares reserved for issuance	150,000,000	150,000,000
Common stock issued	326,000	290,000	254,000
Dividend Reinvestment and Stock Purchase Plan [Member]
Shareholders' Equity [Line Items]
Authorized and unissued common shares reserved for issuance	3,300,000			3,300,000
Shares issued related to dividend reinvestment and stock purchase plan	0	0	0
Employee Stock Purchase Plan [Member]
Shareholders' Equity [Line Items]
Shares issued related to dividend reinvestment and stock purchase plan	24,000	22,000
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	326,000	290,000
Employee Stock Purchase Plan [Member] \| Maximum [Member]
Shareholders' Equity [Line Items]
Number of shares available for purchase, maximum	500,000

Fair_Value_Schedule_of_Fair_Va

Fair Value - Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	$3,881	$3,566
Investment securities available-for-sale	2,657,672	2,372,201
U.S. Treasury [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities available-for-sale	15,166	13,113
Mortgage-backed Securities - Non-agency [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities available-for-sale		17,412
States and Political Subdivisions [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities available-for-sale	314,541	268,795
Pooled Trust Preferred Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities available-for-sale	6,607	8,037
Other Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities available-for-sale	393,745	339,998
Carrying Value [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	3,881	3,566
Residential loans held for sale	15,562	7,705
Derivative assets	18,572	22,087
Derivative liabilities	23,868	19,723
Carrying Value [Member] \| U.S. Treasury [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities available-for-sale	15,166	13,113
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	685,951	435,588
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	1,241,662	1,289,258
Carrying Value [Member] \| Mortgage-backed Securities - Non-agency [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities available-for-sale		17,412
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	314,541	268,795
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	6,607	8,037
Carrying Value [Member] \| Other Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities available-for-sale	393,745	339,998
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	3,881	3,566
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	15,562	7,705
Derivative assets	18,572	22,087
Derivative liabilities	23,868	19,723
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	15,166	13,113
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	685,951	435,588
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	1,241,662	1,289,258
Estimate of Fair Value Measurement [Member] \| Mortgage-backed Securities - Non-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		17,412
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	314,216	268,126
Estimate of Fair Value Measurement [Member] \| States and Political Subdivisions [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities available-for-sale	325	669
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	6,607	8,037
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	31,648	31,254
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	$362,097	$308,744

Fair_Value_Reconciliation_of_A

Fair Value - Reconciliation of All Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Accretion/(amortization) of discount or premium	$20	$22
Credit loss write-downs		-1,000
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	8,037	9,359
Accretion/(amortization) of discount or premium	18	17
Sales/payments received	-1,118	-2,929
Credit loss write-downs		-1,000
Increase/(decrease) in fair value of securities	-330	2,590
Ending balance	6,607	8,037
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	669	984
Accretion/(amortization) of discount or premium	2	5
Sales/payments received	-11
Matured securities	-335	-320
Ending balance	$325	$669

Fair_Value_Additional_Informat

Fair Value - Additional Information (Detail) (USD $)	12 Months Ended
Fair Value - Additional Information (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Accretion of discounts on securities included in interest income	$20,000	$22,000
Credit loss included in noninterest income		1,000,000
Provision for loan losses expensed	5,400,000	6,900,000
Net carrying amount other real estate owned and other repossessed property		9,400,000
Other real estate owned property write-downs	2,600,000	3,500,000
Past due period of mortgage loans held for sale, days	90 days
Interest income for residential loans held for sale	381,000	365,000
Pooled Trust Preferred Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Number of trust preferred securities	3
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	6,400,000
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	30,000,000	25,400,000
Valuation allowance	$10,200,000	$8,300,000

Fair_Value_Quantitative_Inform

Fair Value - Quantitative Information about Significant Unobservable Inputs Used in Fair Value Measurements (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount for type of property, age of appraisal and current status	12.00%
Percentage of illiquid local municipality issuance owned carried at par	100.00%	100.00%
Commercial Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	6,816	9,224
Valuation Techniques	Fair value of collateral	Fair value of collateral
Range (Weighted Average)	24.00%	24.00%
Commercial Real Estate Loan [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	13,011	7,851
Valuation Techniques	Fair value of collateral	Fair value of collateral
Minimum [Member] \| Commercial Loans [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 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%	10.00%
Maximum [Member] \| Commercial Loans [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	94.00%	75.00%
Maximum [Member] \| Commercial Real Estate 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	50.00%	54.00%
Weighted Average [Member] \| Commercial Real Estate 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	29.00%	30.00%
Pooled Trust Preferred Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	6,607	8,037
Valuation Techniques	Discounted cash flow	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	4.40%	1.90%
Expected asset recoveries	0.70%	1.70%
Pooled Trust Preferred Securities [Member] \| Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Additional asset defaults	11.20%	9.60%
Expected asset recoveries	7.00%	9.60%
Pooled Trust Preferred Securities [Member] \| Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Additional asset defaults	8.20%	4.50%
Expected asset recoveries	1.80%	3.20%
States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	325	669
Valuation Techniques	Discounted cash flow	Discounted cash flow
Commercial Real Estate Foreclosed Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	6,146	9,069
Valuation Techniques	Fair value of collateral	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	2.00%	10.00%
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	93.00%	40.00%
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	30.00%	25.00%
Residential Foreclosed Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	254	283
Valuation Techniques	Fair value of collateral	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	8.00%	10.00%
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	81.00%	45.00%
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	45.00%	25.00%

Fair_Value_Quantitative_Inform1

Fair Value - Quantitative Information about Significant Unobservable Inputs Used in Fair Value Measurements (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
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%
Minimum [Member] \| Pooled Trust Preferred Securities [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%
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%
Maximum [Member] \| Pooled Trust Preferred Securities [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 $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Commercial Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral Dependent Impaired Loans fair value disclosure	$6,816	$9,224
Commercial Real Estate Loan [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral Dependent Impaired Loans fair value disclosure	13,011	7,851
Commercial Real Estate Foreclosed Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed Assets fair value disclosure	6,146	9,069
Residential [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed Assets fair value disclosure	254	283
Significant Unobservable Inputs (Level 3) [Member] \| Commercial Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral Dependent Impaired Loans fair value disclosure	6,816	9,224
Significant Unobservable Inputs (Level 3) [Member] \| Commercial Real Estate Loan [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral Dependent Impaired Loans fair value disclosure	13,011	7,851
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]
Foreclosed Assets fair value disclosure	6,146	9,069
Significant Unobservable Inputs (Level 3) [Member] \| Residential [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed Assets fair value disclosure	$254	$283

Fair_Value_Schedule_of_Differe

Fair Value - Schedule of Difference between the Aggregate Fair Value and the Aggregate Remaining Principal Balance (Detail) (Residential Loans Held for Sale [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Residential Loans Held for Sale [Member]
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Aggregate Fair Value	$15,562	$7,705
Difference	375	128
Contractual Principal	$15,187	$7,577

Fair_Value_Changes_in_Fair_Val

Fair Value - Changes in Fair Value for Items Measured at Fair Value Pursuant to Election of the Fair Value (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Trading Securities and Other Trading Assets [Line Items]
Interest (Expense)	($7,275)	($6,251)	($5,046)	($4,787)	($4,945)	($5,898)	($6,491)	($7,052)	($23,359)	($24,386)	($35,942)
Residential Loans Held for Sale [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other Gains and (Losses)									247	-224
Interest Income									0	0
Interest (Expense)										-2
Total Changes in Fair Values Included in Current Period Earnings									$247	($226)

Fair_Value_Carrying_Amounts_an

Fair Value - Carrying Amounts and Estimated Fair Values of Financial Instruments, Not Previously Presented (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - held-to-maturity	$844,054	$762,734
Federal Home Loan Bank stock	41,334	40,584
Loans held for sale	197,900
FDIC indemnification asset	20,603	88,513	116,624
Accrued interest receivable	60,966	50,205
Loan servicing rights	9,534
Noninterest-bearing demand deposits	2,427,748	2,026,490
Time deposits	1,089,018	1,017,975
Repurchase agreements	551,309	462,332
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	239,963	206,723
Accrued interest receivable	29	42
Noninterest-bearing demand deposits	2,427,748	2,026,490
NOW, savings and money market deposits	4,973,898	4,166,438
Federal funds purchased	195,188	115,103
Repurchase agreements	356,120	347,226
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Federal Home Loan Bank stock	41,334	40,584
Loans held for sale	197,928
Accrued interest receivable	21,633	20,708
Loan servicing rights	9,534
Time deposits	1,092,969	1,028,043
Senior unsecured bank notes	179,792
Junior subordinated debentures	32,754	17,605
Repurchase agreements	51,994	52,633
Capital lease obligation	5,515	5,245
Accrued interest payable	4,564	1,877
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commercial	1,646,144	1,414,184
Commercial real estate	1,744,126	1,273,070
Residential real estate	1,615,588	1,475,710
Consumer credit	1,380,835	1,058,021
FDIC indemnification asset	11,358	55,368
Accrued interest receivable	39,304	29,455
Federal Home Loan Bank advances	658,506	485,759
Standby letters of credit	358	380
Commitments to extend credit	2,030	1,648
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	173,486	178,370
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	24,574	36,348
States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - held-to-maturity	653,199	556,670
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	705,875	566,040
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	239,963	206,723
Federal Home Loan Bank stock	41,334	40,584
Loans held for sale	197,928
Commercial	1,626,097	1,386,185
Commercial real estate	1,734,559	1,220,417
Residential real estate	1,537,448	1,384,183
Consumer credit	1,372,248	1,045,034
FDIC indemnification asset	20,603	88,513
Accrued interest receivable	60,966	50,205
Loan servicing rights	9,534
Noninterest-bearing demand deposits	2,427,748	2,026,490
NOW, savings and money market deposits	4,973,898	4,166,438
Time deposits	1,089,018	1,017,975
Federal funds purchased	195,188	115,103
Repurchase agreements	356,121	347,229
Senior unsecured bank notes	175,000
Junior subordinated debentures	45,000	28,000
Repurchase agreements	50,000	50,000
Federal Home Loan Bank advances	649,987	447,856
Capital lease obligation	4,099	4,157
Accrued interest payable	4,564	1,877
Standby letters of credit	358	380
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	167,207	170,621
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	23,648	35,443
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	$653,199	$556,670

Fair_Value_Carrying_Amounts_an1

Fair Value - Carrying Amounts and Estimated Fair Values of Financial Instruments, Not Previously Presented (Parenthetical) (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Residential loans held for sale	$15,600	$7,705
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Residential loans held for sale	$15,600

Derivative_Financial_Instrumen2

Derivative Financial Instruments - Additional Information (Detail) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative [Line Items]
Notional amount	$608,000,000				$464,500,000				$608,000,000	$464,500,000
Reclassified interest Income (Expense)	90,043,000	108,367,000	84,482,000	83,478,000	81,187,000	77,996,000	79,191,000	79,050,000	366,370,000	317,424,000	308,757,000
Fixed Interest Swap [Member]
Derivative [Line Items]
Notional amount	38,000,000				39,500,000				38,000,000	39,500,000
Variable Interest Rate Swap [Member]
Derivative [Line Items]
Notional amount	525,000,000				425,000,000				525,000,000	425,000,000
Interest Rate Lock Commitments [Member]
Derivative [Line Items]
Notional amount	19,700,000				10,500,000				19,700,000	10,500,000
Forward Commitments [Member]
Derivative [Line Items]
Notional amount	29,100,000				17,200,000				29,100,000	17,200,000
Customer Derivative Instrument [Member]
Derivative [Line Items]
Notional amount	435,600,000				436,800,000				435,600,000	436,800,000
Offsetting Counter Party Derivative Instrument [Member]
Derivative [Line Items]
Notional amount	435,600,000				436,800,000				435,600,000	436,800,000
Receive Fixed Pay Floating Interest Rate Swaps [Member]
Derivative [Line Items]
Notional amount	45,000,000								45,000,000
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member] \| Interest Income [Member]
Derivative [Line Items]
Reclassified interest Income (Expense)									600,000
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member] \| Interest Expense [Member]
Derivative [Line Items]
Reclassified interest Income (Expense)									($800,000)

Derivative_Financial_Instrumen3

Derivative Financial Instruments - Summary of Fair Value of Derivative Financial Instruments (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Total derivative assets	$18,572	$22,087
Total derivative liabilities	23,868	19,723
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Total derivative assets	4,278	3,545
Total derivative liabilities	9,951	1,218
Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member] \| Other Assets [Member]
Derivative [Line Items]
Total derivative assets	4,278	3,545
Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member] \| Other Liabilities [Member]
Derivative [Line Items]
Total derivative liabilities	9,951	1,218
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Total derivative assets	14,294	18,542
Total derivative liabilities	13,917	18,505
Not Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member] \| Other Assets [Member]
Derivative [Line Items]
Total derivative assets	13,780	18,279
Not Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member] \| Other Liabilities [Member]
Derivative [Line Items]
Total derivative liabilities	13,917	18,505
Not Designated as Hedging Instrument [Member] \| Mortgage Contracts [Member] \| Other Assets [Member]
Derivative [Line Items]
Total derivative assets	$514	$263

Derivative_Financial_Instrumen4

Derivative Financial Instruments - Schedule of Effect of Derivative Instruments on the Consolidated Statements of Income (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative	$340	($6)	$404
Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative	1,277	1,715	2,791
Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative			241
Interest Rate Contract [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	1,002	1,748	2,114
Interest Rate Contract [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			241
Interest Rate Contract [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	88	209	143
Interest Rate Contract [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	275	-33	677
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	$252	($215)	$261

Commitments_and_Contingencies_1

Commitments and Contingencies - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	Lease
	Office
	FinancialCenters
Commitments And Contingencies [Line Items]
Number of branches subject to operating leases	121
Number of branches	195
Number of branches owned	74
Additional successive terms extendable at the option	4 years
Period of extendable lease term, in years	5 years
Lease term, description	Less than one year
Rent expense	$29	$29.10	$32
Sale leaseback transaction, gain recognized over lease term	68.3	74.4
Loan commitments	1,584	1,271
Fixed rate loan commitment	1,487
Floating rate loan commitment	97.1
Standby letters of credit	65.3	62
Loan commitments fixed interest rate, minimum	0.00%
Loan commitments fixed interest rate, maximum	21.00%
Allowance for unfunded loan commitments	4.4	2.7
Extended credit	13	15.6
Credit extensions with collateral	$11.50	$12.40
Minimum [Member]
Commitments And Contingencies [Line Items]
Lease Term	1 year
Minimum [Member] \| Indiana Community Bancorp [Member]
Commitments And Contingencies [Line Items]
Lease Term	5 years
Maximum [Member]
Commitments And Contingencies [Line Items]
Lease Term	24 years
Maximum [Member] \| Indiana Community Bancorp [Member]
Commitments And Contingencies [Line Items]
Lease Term	24 years

Commitments_and_Contingencies_2

Commitments and Contingencies - Summary of Future Minimum Lease Commitments (Detail) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
2015	$32,338
2016	31,078
2017	30,690
2018	29,281
2019	27,505
Thereafter	229,452
Total	$380,344

Financial_Guarantees_Additiona

Financial Guarantees - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Financial Guarantees [Line Items]
Term of standby letters of credit, years	1 year
Notional amount of standby letters of credit	$65.30	$62
Carrying value of letters of credit	0.4	0.4
Interest rate swap, notional amount	608	464.5
Interest Rate Swap [Member]
Financial Guarantees [Line Items]
Interest rate swap, notional amount	7.6
Interest Rate Swap [Member] \| Additional Risk Participation [Member]
Financial Guarantees [Line Items]
Interest rate swap, notional amount	$13.50

Regulatory_Restrictions_Additi

Regulatory Restrictions - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Maturities of Time Deposits [Abstract]
Reserve balances	$67.90	$50.30
Cash and due from banks held as collateral	$0.20	$0.80
Dividend approval threshold, years	2 years

Regulatory_Restrictions_Schedu

Regulatory Restrictions - Schedule of Capital Ratios (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Old National Bancorp [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital to risk-weighted assets Actual, Amount	$996,929	$871,076
Tier 1 capital to risk-weighted assets Actual, Amount	944,649	821,281
Tier 1 capital to average assets Actual, Amount	944,649	821,281
Total capital to risk-weighted assets Actual, Ratio	13.59%	15.19%
Tier 1 capital to risk-weighted assets Actual, Ratio	12.88%	14.32%
Tier 1 capital to average assets Actual, Ratio	8.79%	8.92%
Total capital to risk-weighted assets For Capital Adequacy Purposes, Amount	586,722	458,717
Tier 1 capital to risk-weighted assets For Capital Adequacy Purposes, Amount	293,361	229,358
Tier 1 capital to average assets For Capital Adequacy Purposes, Amount	429,935	368,092
Total capital to risk-weighted assets For Capital Adequacy Purposes, Ratio	8.00%	8.00%
Tier 1 capital to risk-weighted assets For Capital Adequacy Purposes, Ratio	4.00%	4.00%
Tier 1 capital to average assets For Capital Adequacy Purposes, 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	949,596	720,313
Tier 1 capital to risk-weighted assets Actual, Amount	897,316	670,518
Tier 1 capital to average assets Actual, Amount	897,316	670,518
Total capital to risk-weighted assets Actual, Ratio	13.02%	12.67%
Tier 1 capital to risk-weighted assets Actual, Ratio	12.31%	11.80%
Tier 1 capital to average assets Actual, Ratio	8.41%	7.35%
Total capital to risk-weighted assets For Capital Adequacy Purposes, Amount	583,266	454,685
Tier 1 capital to risk-weighted assets For Capital Adequacy Purposes, Amount	291,633	227,342
Tier 1 capital to average assets For Capital Adequacy Purposes, Amount	426,873	364,793
Total capital to risk-weighted assets For Capital Adequacy Purposes, Ratio	8.00%	8.00%
Tier 1 capital to risk-weighted assets For Capital Adequacy Purposes, Ratio	4.00%	4.00%
Tier 1 capital to average assets For Capital Adequacy Purposes, Ratio	4.00%	4.00%
Total capital to risk-weighted assets For Well Capitalized Purposes, Amount	729,082	568,356
Tier 1 capital to risk-weighted assets For Well Capitalized Purposes, Amount	437,449	341,014
Tier 1 capital to average assets For Well Capitalized Purposes, Amount	$533,591	$455,992
Total capital to risk-weighted assets For Well Capitalized Purposes, Ratio	10.00%	10.00%
Tier 1 capital to risk-weighted assets For Well Capitalized Purposes, Ratio	6.00%	6.00%
Tier 1 capital to average assets For Well Capitalized Purposes, Ratio	5.00%	5.00%

Parent_Company_Financial_State2

Parent Company Financial Statements - Balance Sheet (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Assets
Trading securities - at fair value	$3,881	$3,566
Other assets	238,699	221,293
Total assets	11,647,551	9,581,744	9,543,623
Liabilities and Shareholders' Equity
Other liabilities	219,712	189,481
Other borrowings	920,102
Shareholders' equity	1,465,764	1,162,640	1,194,565	1,033,556
Total liabilities and shareholders' equity	11,647,551	9,581,744
Old National Bancorp [Member]
Assets
Deposits in affiliate bank	168,467	75,637
Trading securities - at fair value	3,881	3,566
Investment securities - available-for-sale	1,338	2,025
Investment in affiliates, Banking subsidiaries	1,398,835	989,585
Investment in affiliates, Non-banks	49,284	42,706
Other assets	91,064	103,423
Total assets	1,712,869	1,216,942
Liabilities and Shareholders' Equity
Other liabilities	31,989	29,564
Other borrowings	215,116	24,738
Shareholders' equity	1,465,764	1,162,640
Total liabilities and shareholders' equity	$1,712,869	$1,216,942

Parent_Company_Financial_State3

Parent Company Financial Statements - Statements of Income (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income
Net securities gains									$9,830	$4,341	$15,052
Expense
Interest on borrowings	7,275	6,251	5,046	4,787	4,945	5,898	6,491	7,052	23,359	24,386	35,942
Other expenses									16,199	21,300	15,953
Income before income taxes	39,552	40,229	26,431	35,752	35,151	30,817	42,212	34,337	141,964	142,517	127,785
Income tax benefit	-10,302	-11,095	-7,658	-9,242	-10,602	-6,869	-13,734	-10,392	-38,297	-41,597	-36,110
Net income	29,250	29,134	18,773	26,510	24,549	23,948	28,478	23,945	103,667	100,920	91,675
Old National Bancorp [Member]
Income
Dividends from affiliates									65,292	116,073	53,042
Net securities gains									170	416	165
Other income									1,554	1,864	1,710
Other income from affiliates									79	138	153
Total income									67,095	118,491	55,070
Expense
Interest on borrowings									3,837	624	786
Other expenses									11,357	11,228	14,270
Total expense									15,194	11,852	15,056
Income before income taxes									51,901	106,639	40,014
Income tax benefit									-4,020	-4,044	-5,909
Income before equity in undistributed earnings of affiliates									55,921	110,683	45,923
Equity in undistributed earnings of affiliates									47,746	-9,763	45,752
Net income									$103,667	$100,920	$91,675

Parent_Company_Financial_State4

Parent Company Financial Statements - Statement of Cash Flows (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash Flows From Operating Activities
Net income	$103,667,000	$100,920,000	$91,675,000
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation	12,366,000	11,227,000	11,306,000
(Increase) decrease in other assets	20,039,000	3,896,000	15,452,000
Increase (decrease) in other liabilities	14,392,000	11,723,000	-14,630,000
Total adjustments	96,053,000	64,491,000	22,615,000
Net cash flows provided by operating activities	199,720,000	165,411,000	114,290,000
Cash Flows From Investing Activities
Purchases of investment securities	-575,894,000	-1,231,117,000	-1,031,124,000
Purchases of premises and equipment	-20,473,000	-18,617,000	-18,712,000
Net cash flows provided by (used in) investing activities	-162,534,000	100,954,000	-11,692,000
Cash Flows From Financing Activities
Payments related to retirement of debt	-211,159,000	-2,521,000	-3,087,000
Proceeds from issuance of other borrowings	525,000,000	375,000,000
Cash dividends paid on common stock	-48,181,000	-40,278,000	-34,657,000
Common stock repurchased	-25,830,000	-24,292,000	-3,990,000
Proceeds from exercise of stock options, including tax benefit	749,000	1,412,000	717,000
Common stock issued	326,000	290,000	254,000
Net cash flows provided by (used in) financing activities	-3,946,000	-323,702,000	-61,410,000
Net increase in cash and cash equivalents	33,240,000	-57,337,000	41,188,000
Cash and cash equivalents at beginning of period	206,723,000	264,060,000	222,872,000
Cash and cash equivalents at end of period	239,963,000	206,723,000	264,060,000
Old National Bancorp [Member]
Cash Flows From Operating Activities
Net income	103,667,000	100,920,000	91,675,000
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation	11,000	8,000	15,000
Net securities gains	-270,000	-416,000	-134,000
Stock compensation expense	4,162,000	3,958,000	3,317,000
(Increase) decrease in other assets	18,540,000	-17,972,000	9,056,000
Increase (decrease) in other liabilities	286,000	3,095,000	-496,000
Equity in undistributed earnings of affiliates	-47,746,000	9,763,000	-45,752,000
Total adjustments	-25,017,000	-1,564,000	-33,994,000
Net cash flows provided by operating activities	78,650,000	99,356,000	57,681,000
Cash Flows From Investing Activities
Net cash and cash equivalents of acquisitions	-82,975,000		1,000
Purchases of investment securities	-45,000	-53,000	-147,000
Net advances to affiliates	-3,832,000
Purchases of premises and equipment	-1,032,000	-60,000	-173,000
Net cash flows provided by (used in) investing activities	-87,884,000	-113,000	-319,000
Cash Flows From Financing Activities
Payments related to retirement of debt			-16,000,000
Proceeds from issuance of other borrowings	175,000,000
Cash dividends paid on common stock	-48,181,000	-40,278,000	-34,657,000
Common stock repurchased	-25,830,000	-24,292,000	-3,990,000
Proceeds from exercise of stock options, including tax benefit	749,000	1,412,000	717,000
Common stock issued	326,000	290,000	254,000
Net cash flows provided by (used in) financing activities	102,064,000	-62,868,000	-53,676,000
Net increase in cash and cash equivalents	92,830,000	36,375,000	3,686,000
Cash and cash equivalents at beginning of period	75,637,000	39,262,000	35,576,000
Cash and cash equivalents at end of period	$168,467,000	$75,637,000	$39,262,000

Segment_Information_Schedule_o

Segment Information - Schedule of Financial Information Concerning Segments (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Net interest income	$90,043	$108,367	$84,482	$83,478	$81,187	$77,996	$79,191	$79,050	$366,370	$317,424	$308,757
Noninterest income	50,495	34,418	39,653	40,563	44,444	47,755	46,244	46,315	165,129	184,758	189,816
Noncash items:
Depreciation and software amortization									14,639	12,523	13,104
Provision for loan losses	869	2,591	-400	37	2,253	-1,724	-3,693	845	3,097	-2,319	5,030
Amortization of intangibles								600	9,120	8,162	7,941
Income tax expense (benefit)	10,302	11,095	7,658	9,242	10,602	6,869	13,734	10,392	38,297	41,597	36,110
Segment profit	29,250	29,134	18,773	26,510	24,549	23,948	28,478	23,945	103,667	100,920	91,675
Segment assets	11,647,551				9,581,744				11,647,551	9,581,744	9,543,623
Banking [Member]
Segment Reporting Information [Line Items]
Net interest income									370,132	317,913	309,321
Noninterest income									121,624	143,953	151,410
Noncash items:
Depreciation and software amortization									13,950	12,082	11,869
Provision for loan losses									3,097	-2,319	5,030
Amortization of intangibles									7,507	6,489	6,100
Income tax expense (benefit)									41,056	44,489	40,569
Segment profit									109,776	104,265	96,882
Segment assets	11,500,974				9,446,349				11,500,974	9,446,349	9,413,281
Insurance [Member]
Segment Reporting Information [Line Items]
Net interest income									11	15	21
Noninterest income									41,314	38,657	36,732
Noncash items:
Depreciation and software amortization									138	142	271
Amortization of intangibles									1,613	1,673	1,841
Income tax expense (benefit)									1,381	1,052	1,397
Segment profit									2,428	1,925	1,755
Segment assets	62,537				65,328				62,537	65,328	62,956
Other [Member]
Segment Reporting Information [Line Items]
Net interest income									-3,773	-504	-585
Noninterest income									2,191	2,148	1,674
Noncash items:
Depreciation and software amortization									551	299	964
Income tax expense (benefit)									-4,140	-3,944	-5,856
Segment profit									-8,537	-5,270	-6,962
Segment assets	$84,040				$70,067				$84,040	$70,067	$67,386

Interim_Financial_Data_Unaudit2

Interim Financial Data (Unaudited) - Interim Financial Data (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Data [Abstract]
Interest income	$97,318	$114,618	$89,528	$88,265	$86,132	$83,894	$85,682	$86,102	$389,729	$341,810	$344,699
Interest expense	7,275	6,251	5,046	4,787	4,945	5,898	6,491	7,052	23,359	24,386	35,942
Net interest income	90,043	108,367	84,482	83,478	81,187	77,996	79,191	79,050	366,370	317,424	308,757
Provision for loan losses	869	2,591	-400	37	2,253	-1,724	-3,693	845	3,097	-2,319	5,030
Noninterest income	50,495	34,418	39,653	40,563	44,444	47,755	46,244	46,315	165,129	184,758	189,816
Noninterest expense	100,117	99,965	98,104	88,252	88,227	96,658	86,916	90,183	386,438	361,984	365,758
Income before income taxes	39,552	40,229	26,431	35,752	35,151	30,817	42,212	34,337	141,964	142,517	127,785
Income tax expense	10,302	11,095	7,658	9,242	10,602	6,869	13,734	10,392	38,297	41,597	36,110
Net income	$29,250	$29,134	$18,773	$26,510	$24,549	$23,948	$28,478	$23,945	$103,667	$100,920	$91,675
Net income per share, Basic	$0.25	$0.26	$0.18	$0.27	$0.24	$0.24	$0.28	$0.24	$0.96	$1	$0.95
Net income per share, Diluted	$0.25	$0.26	$0.18	$0.26	$0.25	$0.23	$0.28	$0.24	$0.95	$1	$0.95
Average shares, Basic	115,924	111,428	103,904	99,797	100,153	100,645	100,981	101,081	107,818	100,712	96,440
Average shares, Diluted	116,592	111,947	104,361	100,325	100,718	101,131	101,352	101,547	108,365	101,198	96,833

Interim_Financial_Data_Unaudit3

Interim Financial Data (Unaudited) - Additional Information (Detail) (Bank of America [Member])	0 Months Ended
	Jul. 12, 2013
	Branch
Bank of America [Member]
Selected Interim Financial Information [Line Items]
Number of branches acquired	24