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Securities Purchased under Resale Agreements and Sold under Repurchase Agreements (Balance Sheet Offsetting) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Assets, Resale Agreements |  |
Gross Amounts of Recognized Assets | $ 1,260,000 | $ 1,435,000
Gross Amounts Offset on the Consolidated Balance Sheet | (400,000) | (400,000)
Net Amounts of Assets Presented on the Consolidated Balance Sheet | 860,000 | 1,035,000
Gross Amounts Not Offset on the Consolidated Balance Sheet |  |
Collateral Received | (859,396) | (1,025,066)
Net Amount | 604 | 9,934
Liabilities, Repurchase Agreements |  |
Gross Amounts of Recognized Liabilities | 450,000 | 450,000
Gross Amounts Offset on the Consolidated Balance Sheet | (400,000) | (400,000)
Net Amounts of Liabilities Presented on the Consolidated Balance Sheet | 50,000 | 50,000
Gross Amounts Not Offset on the Consolidated Balance Sheet |  |
Collateral Pledged | (50,000) | (50,000)
Net Amount | $ 0 | $ 0

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