Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Activities:
Net income	$ 116,750us-gaap_NetIncomeLoss	$ 94,115us-gaap_NetIncomeLoss	$ 84,295us-gaap_NetIncomeLoss
Adjustment to reconcile net income to net cash provided by operating activities:
Provision for credit losses		7,500	28,000
Depreciation and amortization	27,272us-gaap_DepreciationAndAmortization	26,544us-gaap_DepreciationAndAmortization	27,720us-gaap_DepreciationAndAmortization
Deferred taxes	(7,563)us-gaap_DeferredIncomeTaxExpenseBenefit	3,358us-gaap_DeferredIncomeTaxExpenseBenefit	(3,749)us-gaap_DeferredIncomeTaxExpenseBenefit
Amortization of intangibles	4,443us-gaap_AmortizationOfIntangibleAssets	2,979us-gaap_AmortizationOfIntangibleAssets	3,222us-gaap_AmortizationOfIntangibleAssets
Amortization of debt securities premium and discount, net	13,089	15,062	13,422
Share-based compensation expense	1,201us-gaap_ShareBasedCompensation	1,644us-gaap_ShareBasedCompensation	1,886us-gaap_ShareBasedCompensation
Security gains, net	(37)us-gaap_TradingGainsLosses	(46)us-gaap_TradingGainsLosses	(442)us-gaap_TradingGainsLosses
Net deferred loan origination expense	(6,809)	(7,639)	(7,944)
Excess tax benefit from exercise of stock options	(1,856)	(139)	32
Decrease in interest receivable	165	2,206	6,910
Decrease in interest payable	(1,436)	(1,304)	(2,504)
Realized gain on mortgages sold	(31,941)us-gaap_GainLossOnSaleOfMortgageLoans	(49,304)us-gaap_GainLossOnSaleOfMortgageLoans	(68,114)us-gaap_GainLossOnSaleOfMortgageLoans
Proceeds from mortgages sold	914,084	1,530,589	2,019,225
Origination of mortgages held for sale	(920,689)	(1,424,983)	(1,996,479)
Loss on other real estate owned, net	14,545	7,385	30,172
Increase in bank-owned life insurance	(8,848)	(8,314)	(8,074)
(Increase) decrease in prepaid pension asset	26,263	(3,705)	16,795
Decrease in prepaid deposit insurance assessments			11,086
Other, net	3,496	7,784	5,198
Net cash provided by operating activities	142,129	203,732	160,657
Investing Activities:
Proceeds from calls and maturities of available-for-sale securities	584,260	584,926	520,952
Proceeds from sales of available-for-sale securities			3,628
Purchases of available-for-sale securities	(252,467)	(718,432)	(430,819)
Net (increase) decrease in loans and leases	(803,858)	(361,383)	150,225
Purchases of premises and equipment	(17,211)	(25,459)	(24,680)
Proceeds from sale of premises and equipment	527	3,084	1,136
Acquisition of businesses, net of cash acquired	(7,060)us-gaap_CashAcquiredFromAcquisition	(17,360)us-gaap_CashAcquiredFromAcquisition	(5,971)us-gaap_CashAcquiredFromAcquisition
Proceeds from sale of other real estate owned	35,264	54,475	73,660
Proceeds of bank-owned life insurance, net of proceeds from death benefits	1,206		(22,961)
Other, net	(20)	117	(23)
Net cash (used in) provided by investing activities	(459,359)	(480,032)	265,147
Financing Activities:
Net (decrease) increase in deposits	198,503us-gaap_IncreaseDecreaseInDeposits	(314,310)us-gaap_IncreaseDecreaseInDeposits	132,957us-gaap_IncreaseDecreaseInDeposits
Net increase (decrease) in short-term debt and other liabilities	(32,877)	6,403	39,165
Redemption of junior subordinated debt securities	(8,248)	(128,866)
Advances of long-term debt	8,000	50,000
Repayment of long-term debt	(8,066)us-gaap_RepaymentsOfLongTermDebt	(1,786)us-gaap_RepaymentsOfLongTermDebt
Issuance of common stock	11,583	912	110,229
Repurchase of common stock	(711)		(75)
Excess tax (benefit) expense from exercise of stock options	1,856	139	(32)
Payment of cash dividends	(23,983)us-gaap_PaymentsOfDividendsCommonStock	(11,383)us-gaap_PaymentsOfDividendsCommonStock	(3,778)us-gaap_PaymentsOfDividendsCommonStock
Net cash (used in) provided by financing activities	146,057	(398,891)	278,466
(Decrease) increase in Cash and Cash Equivalents	(171,173)	(675,191)	704,270
Cash and Cash Equivalents at Beginning of Year	528,423	1,203,614	499,344
Cash and Cash Equivalents at End of Year	$ 357,250	$ 528,423	$ 1,203,614

The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method.

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The net increase(decrease) in interest income during the period representing the allocation of deferred loan origination fees less deferred loan origination costs using the effective interest method over the term of the debt arrangement to which they pertain taking into account the effect of prepayments.

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Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans made to finance real estate acquisitions. This element refers to the gain (loss) and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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The amount of cash paid for the origination of mortgages that are held for sale.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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Amount of cash inflow from proceeds of Federal Home Loan Bank (FHLBank) advances.

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

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The net cash inflow or outflow in other borrowings not otherwise defined in the taxonomy.

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The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

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

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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 sale of other real estate not otherwise defined in the taxonomy.

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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Amount of gain (loss) resulting from the difference between the acquisition price and the selling price or fair value of trading assets and trading liabilities, conducted separately from customer trading activities. Includes, but is not limited to, changes in fair value of trading assets and trading liabilities.

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