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Investment Securities Securities Gains and Losses (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Investments, Debt and Equity Securities [Abstract]    
Proceeds from sales of securities $ 35,465us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds $ 0us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds
Gross realized gains 1,395us-gaap_AvailableForSaleSecuritiesGrossRealizedGains 36us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Gross realized losses 0us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses 0us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
Net gain 1,395us-gaap_GainLossOnSaleOfSecuritiesNet 36us-gaap_GainLossOnSaleOfSecuritiesNet
Related income taxes $ 488us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax $ 13us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax