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Securities Sold Under Agreements to Repurchase Securities Sold Under Agreements to Repurchase (Details Textual) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Repurchase Agreements    
Securities sold under agreements to repurchase $ 425,652,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchase $ 397,107,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
Repurchase Agreements    
Repurchase Agreements    
Investment securities pledged as collateral $ 474,377,000us-gaap_SecurityOwnedAndPledgedAsCollateralFairValue
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
$ 479,345,000us-gaap_SecurityOwnedAndPledgedAsCollateralFairValue
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember