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Offsetting Arrangements (Assets Offsetting) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Offsetting Assets [Line Items]    
Gross Amount of Recognized Assets   $ 80,502us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross
Gross amounts Offset in the Statement of Financial Condition   0us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedLiability
Net Amount of Assets in Statement of Financial Condition   80,502us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed
Financial Instruments   67,037us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnSecurities
Cash Collateral Received   6,780us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnCash
Net Amount   6,685us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedAmountOffsetAgainstCollateral
Derivative    
Offsetting Assets [Line Items]    
Gross Amount of Recognized Assets 8,107us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_DerivativeMember
20,502us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_DerivativeMember
Gross amounts Offset in the Statement of Financial Condition 0us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedLiability
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_DerivativeMember
0us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedLiability
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_DerivativeMember
Net Amount of Assets in Statement of Financial Condition 8,107us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_DerivativeMember
20,502us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_DerivativeMember
Financial Instruments 2,006us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnSecurities
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_DerivativeMember
2,450us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnSecurities
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_DerivativeMember
Cash Collateral Received 0us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnCash
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_DerivativeMember
6,780us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnCash
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_DerivativeMember
Net Amount 6,101us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedAmountOffsetAgainstCollateral
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_DerivativeMember
11,272us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedAmountOffsetAgainstCollateral
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_DerivativeMember
Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell    
Offsetting Assets [Line Items]    
Gross Amount of Recognized Assets   60,000us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_FederalFundsSoldAndSecuritiesBorrowedOrPurchasedUnderAgreementsToResellMember
Gross amounts Offset in the Statement of Financial Condition   0us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedLiability
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_FederalFundsSoldAndSecuritiesBorrowedOrPurchasedUnderAgreementsToResellMember
Net Amount of Assets in Statement of Financial Condition   60,000us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_FederalFundsSoldAndSecuritiesBorrowedOrPurchasedUnderAgreementsToResellMember
Financial Instruments   64,587us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnSecurities
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_FederalFundsSoldAndSecuritiesBorrowedOrPurchasedUnderAgreementsToResellMember
Cash Collateral Received   0us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnCash
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_FederalFundsSoldAndSecuritiesBorrowedOrPurchasedUnderAgreementsToResellMember
Net Amount   $ (4,587)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedAmountOffsetAgainstCollateral
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_FederalFundsSoldAndSecuritiesBorrowedOrPurchasedUnderAgreementsToResellMember