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Investments (Securities Pledged as Collateral Related to Repurchase Reverse Repurchase Program) (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Assets Sold under Agreements to Repurchase [Line Items] |  |
Document Period End Date | Sep. 30, 2019 |
Securities Loaned, Fair Value of Collateral | $ 104,191 | $ 102,618
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 644,471 | 554,589
Obligation to Return Securities Received as Collateral | 748,662 | 657,207
Securities Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement | 758,883 | 671,492
SecuredBorrowingsGrossDifferenceAmount | 10,221 | 14,285
Maturity Overnight [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Obligation to Return Securities Received as Collateral | 0 | 0
Maturity up to 30 days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Obligation to Return Securities Received as Collateral | 0 | 0
Maturity 30 to 90 Days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 66,264 | 0
Obligation to Return Securities Received as Collateral | 66,264 | 0
Maturity over 90 days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 578,207 | 554,589
Obligation to Return Securities Received as Collateral | 682,398 | 657,207
Corporate Debt Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 104,191 | 102,618
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 324,033 | 254,151
Corporate Debt Securities [Member] | Maturity Overnight [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 0 | 0
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Corporate Debt Securities [Member] | Maturity up to 30 days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 0 | 0
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Corporate Debt Securities [Member] | Maturity 30 to 90 Days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 0 | 0
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Corporate Debt Securities [Member] | Maturity over 90 days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 104,191 | 102,618
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 324,033 | 254,151
US Government Agencies Debt Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement |  | 221,572
US Government Agencies Debt Securities [Member] | Maturity Overnight [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement |  | 0
US Government Agencies Debt Securities [Member] | Maturity up to 30 days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement |  | 0
US Government Agencies Debt Securities [Member] | Maturity 30 to 90 Days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement |  | 0
US Government Agencies Debt Securities [Member] | Maturity over 90 days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement |  | 221,572
US Treasury and Government [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 208,388 |
US Treasury and Government [Member] | Maturity Overnight [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 |
US Treasury and Government [Member] | Maturity up to 30 days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 |
US Treasury and Government [Member] | Maturity 30 to 90 Days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 66,264 |
US Treasury and Government [Member] | Maturity over 90 days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 142,124 |
Debt Security, Government, Non-US [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 112,050 | 78,866
Debt Security, Government, Non-US [Member] | Maturity Overnight [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Debt Security, Government, Non-US [Member] | Maturity up to 30 days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Debt Security, Government, Non-US [Member] | Maturity 30 to 90 Days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Debt Security, Government, Non-US [Member] | Maturity over 90 days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 112,050 | $ 78,866
Other Debt Obligations [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 |
Other Debt Obligations [Member] | Maturity Overnight [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 |
Other Debt Obligations [Member] | Maturity up to 30 days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 |
Other Debt Obligations [Member] | Maturity 30 to 90 Days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 |
Other Debt Obligations [Member] | Maturity over 90 days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | $ 0 |

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