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Repurchase Agreements - Outstanding Repurchase Agreement Borrowings by Contractual Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Outstanding repurchase agreement by contractual maturity $ 2,352,102 $ 1,543,577
Within 30 days    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Outstanding repurchase agreement by contractual maturity 449,474 732,051
Over 30 days to 90 days    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Outstanding repurchase agreement by contractual maturity 1,647,683 677,906
Over 90 days    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Outstanding repurchase agreement by contractual maturity $ 254,945 $ 133,620