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Securities (Details 5) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Trading Securities    
Trading securities, at estimated fair value $ 8,605us-gaap_TradingSecurities $ 8,992us-gaap_TradingSecurities
Obligations of U.S. Government sponsored entities [Member]    
Trading Securities    
Trading securities, at estimated fair value 7,240us-gaap_TradingSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember		 7,404us-gaap_TradingSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Residential Mortgage-backed securities U.S. Government sponsored entities [Member]    
Trading Securities    
Trading securities, at estimated fair value $ 1,365us-gaap_TradingSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		 $ 1,588us-gaap_TradingSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember