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CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Statement of Comprehensive Income [Abstract]    
Net income $ 16,172us-gaap_NetIncomeLoss $ 13,620us-gaap_NetIncomeLoss
Other comprehensive income net of tax:    
Unrealized holding gain on securities available for sale arising during the period, net of tax of $528 and $2,804 980us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 5,207us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Unrealized gain on securities available for sale for which a portion of an other than temporary impairment has been recognized in income, net of tax of $627    1,164us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAvailableforsaleSecurities
Unrealized loss on cash flow hedges arising during the period, net of tax of $447 and $443 (829)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax (823)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Reclassification adjustment for losses included in net income, net of tax of $235 and $83 (436)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax (154)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
Period change (285)us-gaap_OtherComprehensiveIncomeLossNetOfTax 5,394us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income $ 15,887us-gaap_ComprehensiveIncomeNetOfTax $ 19,014us-gaap_ComprehensiveIncomeNetOfTax