Consolidated Statements of Cash Flows (unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash Flows From Operating Activities
Net income	$ 20,906us-gaap_NetIncomeLoss	$ 26,510us-gaap_NetIncomeLoss
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation	4,140us-gaap_Depreciation	2,943us-gaap_Depreciation
Amortization of other intangible assets	3,081us-gaap_AmortizationOfIntangibleAssets	1,837us-gaap_AmortizationOfIntangibleAssets
Net premium amortization on investment securities	4,792	2,998
Amortization of FDIC indemnification asset	968	7,343
Stock compensation expense	1,204us-gaap_ShareBasedCompensation	1,028us-gaap_ShareBasedCompensation
Provision for loan losses	1us-gaap_ProvisionForLoanAndLeaseLosses	37us-gaap_ProvisionForLoanAndLeaseLosses
Net securities gains	(2,683)us-gaap_GainLossOnSaleOfSecuritiesNet	(559)us-gaap_GainLossOnSaleOfSecuritiesNet
Impairment on available-for-sale securities		100us-gaap_ImpairmentOfInvestments
Recognition of deferred gain on sale leaseback transactions	(1,524)	(1,524)
Net gains on sales of other assets	(52)	(466)
Increase in cash surrender value of company-owned life insurance	(2,062)	(1,835)
Residential real estate loans originated for sale	(78,224)	(17,747)
Proceeds from sale of residential real estate loans	73,968	19,743
(Increase) decrease in interest receivable	(277)	1,441
Decrease in other real estate owned	1,470	685
(Increase) decrease in other assets	(4,516)	16,139
Decrease in accrued expenses and other liabilities	(18,072)	(3,134)
Total adjustments	(17,786)	29,029
Net cash flows provided by operating activities	3,120	55,539
Cash Flows From Investing Activities
Net cash and cash equivalents of acquired banks	(37,098)us-gaap_CashAcquiredFromAcquisition
Purchases of investment securities available-for-sale	(129,563)	(93,992)
Purchases of investment securities held-to-maturity		(25,185)
Purchases of Federal Reserve stock	(2,083)
Proceeds from maturities, prepayments and calls of investment securities available-for-sale	132,471	91,335
Proceeds from sales of investment securities available-for-sale	170,265	16,523
Proceeds from maturities, prepayments and calls of investment securities held-to-maturity	5,609	7,350
Proceeds from sales of investment securities held-to-maturity	855
Reimbursements under FDIC loss share agreements		15,989
Net principal collected from (loans made to) loan customers	18,424	11,054
Proceeds from sale of premises and equipment and other assets	4	6
Purchases of premises and equipment and other assets	(6,959)	(3,515)
Net cash flows provided by investing activities	151,925	19,565
Cash Flows From Financing Activities
Deposits	60,200	47,259
Short-term borrowings	(100,794)	(52,204)
Payments for maturities on other borrowings	(227,017)us-gaap_RepaymentsOfOtherLongTermDebt	(175,120)us-gaap_RepaymentsOfOtherLongTermDebt
Proceeds from issuance of other borrowings	150,000	125,000
Cash dividends paid on common stock	(14,238)us-gaap_PaymentsOfDividendsCommonStock	(10,997)us-gaap_PaymentsOfDividendsCommonStock
Common stock repurchased	(48,203)	(1,576)
Proceeds from exercise of stock options, including tax benefit	260	257
Common stock issued	97	78
Net cash flows used in financing activities	(179,695)	(67,303)
Net increase (decrease) in cash and cash equivalents	(24,650)	7,801
Cash and cash equivalents at beginning of period	239,963	206,723
Cash and cash equivalents at end of period	215,313	214,524
Supplemental cash flow information:
Total interest paid	9,374us-gaap_InterestPaidNet	4,935us-gaap_InterestPaidNet
Total taxes paid (net of refunds)	$ (49)us-gaap_IncomeTaxesPaidNet	$ 3,001us-gaap_IncomeTaxesPaidNet

The (increase) decrease during the reporting period in cash surrender value of company owned life insurance.

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The (increase) decrease during the reporting period in other real estate owned.

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Net gains (losses) on sales and write downs of loans and other assets.

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Reimbursements received from the FDIC under the loss sharing agreement during the reporting period.

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The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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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 increase (decrease) during the reporting period in other liabilities used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current liabilities, other noncurrent liabilities, or a combination of other current and noncurrent liabilities.

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The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.

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Amount of cash inflow (outflow) of financing activities, excluding discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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

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Amount of cash outflow to acquire Federal Reserve Bank (FRB) stock.

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Amount of cash outflow through purchase of long-term held-to-maturity securities.

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The cash inflow from other long-term borrowings not otherwise defined in the taxonomy (with maturities initially due beyond one year or the normal operating cycle of the entity, if longer).

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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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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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

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The cash outflow attributable to repayments of borrowings not otherwise defined in the taxonomy (with maturities initially due after one year or beyond the operating cycle if longer).

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

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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.

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