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Fair Value of Financial Instruments - Embedded Derivatives Level 3 Roll Forward (Details) - Embedded Credit Derivative - GSE CRT
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning balance $ 10,281
Sales and settlements 31,354
Realized credit derivative gains (losses), net (31,354)
Unrealized credit derivative gains (losses), net (10,281)
Ending balance $ 0