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Securities Sold Under Agreements to Repurchase (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Securities Sold Under Agreements to Repurchase.    
Securities sold under agreements to repurchase $ 59,877us-gaap_SecuritiesSoldUnderAgreementsToRepurchase $ 69,559us-gaap_SecuritiesSoldUnderAgreementsToRepurchase