Unaudited Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating Activities
Net income	$ 27,670us-gaap_NetIncomeLoss	$ 26,730us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	765	1,122
Net amortization of investment securities premiums and discounts	6,282	7,619
Loans held for sale originated or acquired	(192,332)	(116,771)
Proceeds from sales of loans held for sale	193,667	135,309
Gain on sale of loans	(5,430)us-gaap_GainLossOnSalesOfLoansNet	(3,595)us-gaap_GainLossOnSalesOfLoansNet
(Gain) loss on sale of investments	(5)us-gaap_GainLossOnSaleOfSecuritiesNet	51us-gaap_GainLossOnSaleOfSecuritiesNet
Stock-based compensation expense, net of tax benefits	347us-gaap_ShareBasedCompensation	453us-gaap_ShareBasedCompensation
Excess tax (benefits) deficiencies from stock-based compensation	(102)	14
Depreciation of premises and equipment	3,206us-gaap_DepreciationNonproduction	2,685us-gaap_DepreciationNonproduction
Gain on sale of other real estate owned and write-downs, net	(2)	(524)
Amortization of core deposit intangibles	731us-gaap_AmortizationOfIntangibleAssets	710us-gaap_AmortizationOfIntangibleAssets
Net (increase) decrease in accrued interest receivable	(1,871)	624
Net decrease (increase) in other assets	2,619	(4,927)
Net decrease in accrued interest payable	(393)	(332)
Net increase in other liabilities	2,944	4,751
Net cash provided by operating activities	38,096	53,919
Investing Activities
Sales of available-for-sale securities	35,558	788
Maturities, prepayments and calls of available-for-sale securities	161,179	138,272
Purchases of available-for-sale securities	(311,895)	(58,192)
Maturities, prepayments and calls of held-to-maturity securities	460	3,930
Purchases of held-to-maturity securities	(50,005)	(5,618)
Principal collected on loans	332,693	323,418
Loans originated or acquired	(454,511)	(358,240)
Net addition of premises and equipment and other real estate owned	(3,889)	(1,771)
Proceeds from sale of other real estate owned	3,245	4,000
Net sale of non-marketable equity securities	514	0
Net cash received in acquisitions	19,712	0
Net cash (used in) provided by investing activities	(266,939)	46,587
Financing Activities
Net (decrease) increase in deposits	(33,240)us-gaap_IncreaseDecreaseInDeposits	44,498us-gaap_IncreaseDecreaseInDeposits
Net increase in securities sold under agreements to repurchase	27,188	13,928
Net decrease in short-term Federal Home Loan Bank advances	0	(126,000)
Proceeds from long-term Federal Home Loan Bank advances	0	60,000
Repayments of long-term Federal Home Loan Bank advances	(731)	(87,438)
Net decrease in other borrowed funds	(572)	(283)
Cash dividends paid	(22,557)us-gaap_PaymentsOfDividendsCommonStock	0us-gaap_PaymentsOfDividendsCommonStock
Excess tax benefits (deficiencies) from stock-based compensation	102	(14)
Stock-based compensation activity	(290)	837
Net cash used in by financing activities	(30,100)	(94,472)
Net (decrease) increase in cash and cash equivalents	(258,943)	6,034
Cash and cash equivalents at beginning of period	442,409	155,657
Cash and cash equivalents at end of period	183,466	161,691
Supplemental Disclosure of Cash Flow Information
Cash paid during the period for interest	7,775us-gaap_InterestPaid	6,972us-gaap_InterestPaid
Cash paid during the period for income taxes	0us-gaap_IncomeTaxesPaid	818us-gaap_IncomeTaxesPaid
Supplemental Disclosure of Non-Cash Investing Activities
Transfer of investment securities from available-for-sale to held-to-maturity	0us-gaap_TransferOfInvestments	484,583us-gaap_TransferOfInvestments
Sale and refinancing of other real estate owned	256us-gaap_TransferOfOtherRealEstate	157us-gaap_TransferOfOtherRealEstate
Transfer of loans to other real estate owned	3,217us-gaap_TransferToOtherRealEstate	4,105us-gaap_TransferToOtherRealEstate
Fair value of common stock shares issued	10,776us-gaap_StockIssued1	0us-gaap_StockIssued1
Cash consideration for outstanding shares	12,219	0
Fair value of assets acquired	174,637us-gaap_FairValueOfAssetsAcquired	0us-gaap_FairValueOfAssetsAcquired
Liabilities assumed	$ 152,779us-gaap_LiabilitiesAssumed1	$ 0us-gaap_LiabilitiesAssumed1

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