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Accounting Policies - Transfers of Financial Assets and Liabilities (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Accounting Policies [Abstract]    
Federal Funds Sold and Securities Purchased under Agreements to Resell Pledged as Collateral $ 0us-gaap_FederalFundsSoldAndSecuritiesPurchasedUnderAgreementsToResellPledgedAsCollateral $ 0us-gaap_FederalFundsSoldAndSecuritiesPurchasedUnderAgreementsToResellPledgedAsCollateral
Security Owned and Sold, Not yet Purchased Fair Value, Security Sold, Not yet Purchased $ 0us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased $ 0us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased