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