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Balance Sheet Offsetting - Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Total    
Gross Amounts of Recognized Liabilities $ 1,506,009 $ 1,525,859
Gross Amounts Offset in the Balance Sheet   (120)
Net Amounts of Liabilities Presented in the Balance Sheet 1,506,009 1,525,739
Gross Amounts Not Offset in the Balance Sheet    
Financial Instruments (1,429,190) (1,431,739)
Net Amount 76,819 94,000
Institutional Counterparties    
Securities loaned:    
Gross Amounts of Recognized Liabilities 1,350,722 1,245,066
Net Amounts of Liabilities Presented in the Balance Sheets 1,350,722 1,245,066
Gross Amounts Not Offset in the Balance Sheet    
Financial Instruments (1,283,622) (1,179,090)
Net Amount 67,100 65,976
Institutional Counterparties | Interest rate swaps    
Derivatives:    
Gross Amounts of Recognized Liabilities 46 2,196
Net Amounts of Liabilities Presented in the Balance Sheet 46 2,196
Gross Amounts Not Offset in the Balance Sheet    
Financial Instruments   (2,123)
Net Amount 46 73
Institutional Counterparties | Repurchase agreements    
Repurchase agreements:    
Gross Amounts of Recognized Liabilities 155,237 237,856
Net Amounts of Liabilities Presented in the Balance Sheet 155,237 237,856
Gross Amounts Not Offset in the Balance Sheet    
Financial Instruments (145,564) (237,856)
Net Amount 9,673 0
Institutional Counterparties | Forward MBS Derivatives    
Derivatives:    
Gross Amounts of Recognized Liabilities 4 40,741
Gross Amounts Offset in the Balance Sheet   (120)
Net Amounts of Liabilities Presented in the Balance Sheet 4 40,621
Gross Amounts Not Offset in the Balance Sheet    
Financial Instruments (4) (12,670)
Net Amount $ 0 $ 27,951