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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