Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash Flows from Operating Activities
Net income	$ 25,126us-gaap_NetIncomeLoss	$ 22,336us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization, and accretion	3,791	4,396
Amortization of purchase accounting adjustments, net	(5,430)	(45)
Provision for loan losses	5,345us-gaap_ProvisionForLoanAndLeaseLosses	2,103us-gaap_ProvisionForLoanAndLeaseLosses
Share-based equity compensation expense	2,952us-gaap_ShareBasedCompensation	2,835us-gaap_ShareBasedCompensation
Gain on sale of assets, net	(16)us-gaap_GainLossOnDispositionOfAssets1	(6)us-gaap_GainLossOnDispositionOfAssets1
Gain on sale of available for sale investments	(386)us-gaap_GainLossOnSaleOfInvestments	(19)us-gaap_GainLossOnSaleOfInvestments
Gain on sale of OREO, net	(998)	(400)
Impairment of FDIC loss share receivables and other long-lived assets		332us-gaap_AssetImpairmentCharges
Amortization of premium/discount on investments	3,815	3,314
Benefit for deferred income taxes	(62)us-gaap_DeferredIncomeTaxExpenseBenefit	(29,138)us-gaap_DeferredIncomeTaxExpenseBenefit
Originations of mortgage loans held for sale	(495,874)	(317,579)
Proceeds from sales of mortgage loans held for sale	456,278	320,106
Gain on sale of mortgage loans held for sale, net	(13,780)us-gaap_GainLossOnSaleOfMortgageLoans	(9,202)us-gaap_GainLossOnSaleOfMortgageLoans
Tax benefit associated with share-based payment arrangements	(252)	(906)
Decrease in other assets, net of other assets acquired	56,842	19,936
Other operating activities, net	6,396us-gaap_OtherNoncashIncomeExpense	(11,074)us-gaap_OtherNoncashIncomeExpense
Net Cash Provided by Operating Activities	43,747	6,989
Cash Flows from Investing Activities
Proceeds from sales of securities available for sale	40,887	14,050
Proceeds from maturities, prepayments and calls of securities available for sale	85,627	78,498
Purchases of securities available for sale	(121,876)	(76,223)
Proceeds from maturities, prepayments and calls of securities held to maturity	3,296	3,180
Reimbursement of recoverable covered asset losses from (to) the FDIC	632	(76)
Increase in loans, net	(71,686)	(45,563)
Proceeds from sale of premises and equipment	47	101
Purchases of premises and equipment, net of premises and equipment acquired	(1,837)	(4,818)
Proceeds from disposition of real estate owned	10,769	11,543
Cash paid for additional investment in tax credit entities		(4,717)
Cash received in excess of cash paid for acquisitions	325,444	91,685
Other investing activities, net	1,780	(5,100)
Net Cash Provided by Investing Activities	273,083	62,560
Cash Flows from Financing Activities
Increase (decrease) in deposits, net of deposits acquired	365,847us-gaap_IncreaseDecreaseInDeposits	(29,350)us-gaap_IncreaseDecreaseInDeposits
Net change in short-term borrowings, net of borrowings acquired	(242,368)	2,742
Proceeds from long-term debt	60,000
Repayments of long-term debt	(70,527)us-gaap_RepaymentsOfLongTermDebt	(780)us-gaap_RepaymentsOfLongTermDebt
Dividends paid to shareholders	(11,374)us-gaap_PaymentsOfDividendsCommonStock	(10,128)us-gaap_PaymentsOfDividendsCommonStock
Proceeds from common stock transactions	3,087	8,247
Payments to repurchase common stock	(2,552)	(2,274)
Tax benefit associated with share-based payment arrangements	252	906
Net Cash Provided by (Used in) Financing Activities	102,365	(30,637)
Net Increase in Cash and Cash Equivalents	419,195	38,912
Cash and Cash Equivalents at Beginning of Period	548,095	391,396
Cash and Cash Equivalents at End of Period	967,290	430,308
Supplemental Schedule of Noncash Activities
Acquisition of real estate in settlement of loans	4,821us-gaap_TransferToOtherRealEstate	4,628us-gaap_TransferToOtherRealEstate
Common stock issued in acquisitions	289,504us-gaap_StockIssued1
Supplemental Disclosures Cash paid for:
Interest on deposits and borrowings	11,988us-gaap_InterestPaidNet	9,708us-gaap_InterestPaidNet
Income taxes, net	$ 900us-gaap_IncomeTaxesPaidNet	$ 13,208us-gaap_IncomeTaxesPaidNet

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FDIC reimbursement of recoverable covered asset losses.

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The cash outflow associated with additional investments in new market tax credit entities.

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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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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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The cash inflow associated with the acquisition of a business when the cash held by the acquired business exceeds the cash payments to acquire the business.

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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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Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the 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. Includes effect from exchange rate changes.

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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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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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Amount of cash outflow for 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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Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

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The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities.

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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 gain (loss) resulting from sales and other disposals of other real estate owned, increases (decreases) in the valuation allowance for foreclosed real estate, and write-downs of other real estate owned after acquisition or physical possession.

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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 net cash inflow or outflow for the increase (decrease) in the beginning and end of period deposits balances.

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

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

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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 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.

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

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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

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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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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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The fair value of stock issued in noncash financing activities.

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Value transferred from mortgage loans to real estate owned (REO) in noncash transactions.

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