Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016
Cash Flows From Operating Activities
Net income	$ 74,846	$ 66,099
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation	10,406	7,462
Amortization of other intangible assets	5,801	6,012
Net premium amortization on investment securities	7,529	9,198
Amortization of FDIC indemnification asset		(458)
Stock-based compensation expense	3,184	3,391
Excess tax (benefit) expense on stock-based compensation	160
Provision for loan losses	1,702	1,410
Net securities (gains) losses	(4,575)	(2,962)
Recognition of deferred gain on sale leaseback transactions	(1,075)	(2,090)
Gain on sale of ONB Insurance Group, Inc.		(41,864)
Net gains on sales of loans and other assets	(5,398)	(2,689)
Increase in cash surrender value of company-owned life insurance	(4,266)	(4,118)
Residential real estate loans originated for sale	(179,025)	(238,184)
Proceeds from sale of residential real estate loans	246,549	219,854
(Increase) decrease in interest receivable	1,551	(3,130)
(Increase) decrease in other real estate owned	7,475	6,487
(Increase) decrease in other assets	3,707	22,266
Increase (decrease) in accrued expenses and other liabilities	(20,504)	6,345
Total adjustments	73,221	(13,070)
Net cash flows provided by (used in) operating activities	148,067	53,029
Cash Flows From Investing Activities
Cash portion of bank purchase price, net of cash acquired		(62,532)
Proceeds from sale of ONB Insurance Group, Inc.		91,771
Purchases of investment securities available-for-sale	(414,742)	(799,597)
Purchases of Federal Home Loan Bank/Federal Reserve Bank stock	(8,008)
Proceeds from maturities, prepayments, and calls of investment securities available-for-sale	252,486	721,414
Proceeds from sales of investment securities available-for-sale	186,277	107,451
Proceeds from maturities, prepayments, and calls of investment securities held-to-maturity	48,204	2,842
Proceeds from redemption of Federal Home Loan Bank/Federal Reserve Bank stock	9
Proceeds from sales of trading securities	127
Reimbursements under FDIC loss share agreements		10,000
Net principal collected from (loans made to) loan customers	(222,052)	(246,987)
Proceeds from settlements on company-owned life insurance	2,347	2,497
Proceeds from sale of premises and equipment and other assets	10,120	5,707
Purchases of premises and equipment and other assets	(9,461)	(12,317)
Net cash flows provided by (used in) investing activities	(154,693)	(179,751)
Cash Flows From Financing Activities
Deposits	(59,539)	198,029
Federal funds purchased and interbank borrowings	14,026	(27,555)
Securities sold under agreements to repurchase	(68,958)	(36,417)
Payments for maturities of Federal Home Loan Bank advances	(892,298)	(575,554)
Payments for maturities of other borrowings	(97)	(34)
Proceeds from Federal Home Loan Bank advances	1,055,000	650,000
Cash dividends paid on common stock	(35,219)	(32,391)
Common stock repurchased	(1,852)	(1,546)
Proceeds from exercise of stock options	2,597	90
Common stock issued	188	202
Net cash flows provided by (used in) financing activities	13,848	174,824
Net increase (decrease) in cash and cash equivalents	7,222	48,102
Cash and cash equivalents at beginning of period	255,519	219,818
Cash and cash equivalents at end of period	262,741	267,920
Supplemental cash flow information:
Total interest paid	26,534	19,824
Total taxes paid (net of refunds)	$ 3,000	$ 8,800

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Gain (loss) from sale or disposal of an organization or integrated set of activities (for example, but not limited to, a partnership or corporation) engaged in providing a product or service in a commercial, industrial, or professional environment.

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The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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The increase (decrease) during the reporting period in the amount due from borrowers for interest payments.

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The net cash inflow or outflow from the fund borrowed from other financial institution arising from the insufficient reserve deposited at Federal Reserve Bank to meet legal requirement. This borrowing is usually contracted on an overnight basis at an agreed rate of interest.

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The increase (decrease) in interest-bearing deposits domestic.

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The cash inflow from the additional capital contribution to the entity.

+ References

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Amount of cash inflow for proceeds from settlement of corporate-owned life insurance policy, classified as investing activities. Includes, but is not limited to, bank-owned life insurance policy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
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-SubTopic 10
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-Paragraph 21C
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The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (a),(b)
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-Topic 320
-SubTopic 10
-Section 45
-Paragraph 11
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- Definition

The cash inflow associated with the maturity, prepayments and calls (requests for early payments) of debt securities designated as held-to-maturity.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
-Paragraph 11
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-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (a)
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- Definition

The cash flow from investments sold under the agreement to repurchase such investment.

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- Definition

The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 11
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-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (a),(b)
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- Definition

The cash inflow from sales of loans that are secured with real estate mortgages and are held with the intention to resell in the near future.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (c)
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-SubTopic 10
-Section 45
-Paragraph 21
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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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- Definition

The cash inflow associated with the sale of securities classified as trading securities and held for investment purposes. Excludes proceeds from trading securities purchased and held principally for the purpose of selling them in the near term (thus held for only a short period of time).

+ References

No definition available.

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- Definition

Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
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-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=SL79508275-113901

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- Definition

Amount of expense related to estimated loss from loan and lease transactions.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.11)
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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow for the payment of loan drawn from Federal Home Loan.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of cash outflow for the payment of debt classified as other, maturing after one year or the operating cycle, if longer.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
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- Definition

The portion of the deferred gain that was recognized in the current period.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 40
-Section 35
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=77907795&loc=d3e50609-112754

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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- References

No definition available.

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