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Offsetting Arrangement (Liabilities Offsetting) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Offsetting Liabilities [Line Items]    
Gross amount of Recognized Liabilities $ 994,514us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross $ 1,295,672us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross
Gross amount Offset in the Statement of Financial Condition 0us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAsset 0us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAsset
Net Amount of Liabilities Presented in the Statement of Financial Condition 994,514us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoaned 1,295,672us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoaned
Financial Instruments 1,088,525us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimSecurities 1,277,919us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimSecurities
Cash Collateral Provided 2,980us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimCash 70,009us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimCash
Net Amount (96,991)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral (52,256)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral
Derivative Financial Instruments, Liabilities [Member]    
Offsetting Liabilities [Line Items]    
Gross amount of Recognized Liabilities 16,698us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
30,672us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Gross amount Offset in the Statement of Financial Condition 0us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAsset
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
0us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAsset
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Net Amount of Liabilities Presented in the Statement of Financial Condition 16,698us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoaned
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
30,672us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoaned
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Financial Instruments 0us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimSecurities
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
0us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimSecurities
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Cash Collateral Provided 2,980us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimCash
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
2,980us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimCash
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Net Amount 13,718us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
27,692us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Securities Loaned or Sold under Agreements to Repurchase    
Offsetting Liabilities [Line Items]    
Gross amount of Recognized Liabilities 977,816us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseMember
1,265,000us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseMember
Gross amount Offset in the Statement of Financial Condition 0us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAsset
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseMember
0us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAsset
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseMember
Net Amount of Liabilities Presented in the Statement of Financial Condition 977,816us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoaned
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseMember
1,265,000us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoaned
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseMember
Financial Instruments 1,088,525us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimSecurities
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseMember
1,277,919us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimSecurities
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseMember
Cash Collateral Provided 0us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimCash
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseMember
67,029us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimCash
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseMember
Net Amount $ (110,709)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseMember
$ (79,948)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral
/ us-gaap_AssetsAndAssociatedLiabilitiesAccountedForAsSecuredBorrowingsByTypeAxis
= us-gaap_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseMember