Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating Activities:
Net income	$ 32,266us-gaap_NetIncomeLoss	$ 28,444us-gaap_NetIncomeLoss
Adjustment to reconcile net income to net cash provided by operating activities:
Provision for credit losses	(5,000)
Depreciation and amortization	6,721us-gaap_DepreciationAndAmortization	6,573us-gaap_DepreciationAndAmortization
Deferred taxes		(1,939)us-gaap_DeferredIncomeTaxExpenseBenefit
Amortization of intangibles	1,032us-gaap_AmortizationOfIntangibleAssets	1,058us-gaap_AmortizationOfIntangibleAssets
Amortization of debt securities premium and discount, net	3,332	3,399
Share-based compensation expense	1,645us-gaap_ShareBasedCompensation	487us-gaap_ShareBasedCompensation
Security losses (gains), net	(14)us-gaap_TradingGainsLosses	4us-gaap_TradingGainsLosses
Net deferred loan origination expense	(1,523)	(1,610)
Excess tax benefit from exercise of stock options	521	1,154
(Increase) decrease in interest receivable	(948)	(516)
Decrease in interest payable	(29)	(786)
Realized gain on mortgages sold	(9,124)us-gaap_GainLossOnSaleOfMortgageLoans	(6,444)us-gaap_GainLossOnSaleOfMortgageLoans
Proceeds from mortgages sold	269,213	157,303
Origination of mortgages held for sale	(311,115)	(146,494)
Loss on other real estate owned, net	1,394	2,297
Increase in bank-owned life insurance	(1,813)	(1,848)
Decrease in prepaid pension asset		1,415
Other, net	7,153	11,356
Net cash provided by operating activities	(6,289)	53,853
Investing activities:
Proceeds from calls and maturities of available-for-sale securities	75,917	145,202
Proceeds from sales of available-for-sale securities	1,110
Purchases of available-for-sale securities	(118,760)	(95,552)
Net (increase) decrease in loans and leases	(16,098)	(117,138)
Purchases of premises and equipment	(7,384)	(5,698)
Proceeds from sale of premises and equipment	271	110
Purchase of bank-owned life insurance, net of proceeds from death benefits	2,742	1,206
Proceeds from sale of other real estate owned, net	7,391	8,157
Other, net	(6)	(6)
Net cash used in investing activities	(54,817)	(63,719)
Financing activities:
Net increase in deposits	280,315us-gaap_IncreaseDecreaseInDeposits	37,954us-gaap_IncreaseDecreaseInDeposits
Net increase (decrease) in short-term debt and other liabilities	(5,341)	35,271
Advances of long-term debt		8,000
Repayment of advances of long-term debt	(2,093)us-gaap_RepaymentsOfLongTermDebt	(3,879)us-gaap_RepaymentsOfLongTermDebt
Redemption of Junior Subordinated Debt		(8,248)us-gaap_RepaymentsOfSubordinatedDebt
Issuance of common stock	825	8,944
Repurchase of common stock	(2,288)	(584)
Excess tax benefit from exercise of stock options	(521)	(1,154)
Payment of cash dividends	(7,235)us-gaap_PaymentsOfDividendsCommonStock	(4,751)us-gaap_PaymentsOfDividendsCommonStock
Net cash (used in) provided by financing activities	263,662	71,553
Increase (decrease) in cash and cash equivalents	202,556	61,687
Cash and cash equivalents at beginning of period	357,250	528,423
Cash and cash equivalents at end of period	$ 559,806	$ 590,110

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 currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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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 net cash outflow or inflow for the increase (decrease) in the beginning and end of period of loan and lease balances which are not originated or purchased specifically for resale. Includes cash payments and proceeds associated with (a) loans held-for-investment, (b) leases held-for-investment, and (c) both.

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The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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The cash outflow to reacquire common stock during the period.

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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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The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.

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The cash outflow for payments to purchase life insurance policies for which the entity is the beneficiary.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

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

+ References

No definition available.

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

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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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- Definition

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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- 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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-Publisher FASB

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- Definition

The cash inflow associated with the sale of other real estate not otherwise defined in the taxonomy.

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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

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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- Definition

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

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-Publisher FASB

-Name Accounting Standards Codification

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The cash outflow from the repayment of long-term borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in case of liquidation of the entity's assets or underlying collateral.

+ References

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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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- Definition

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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-Subparagraph (SX 210.9-04.13(e))

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