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Fair Value - Sensitivity Analysis (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Fair Value Disclosures [Abstract]  
Weighted average prepayment speeds, 10% $ (39,478)
Weighted average prepayment speeds, 20% (76,100)
Discount rate (Option-adjusted spread), 10% (24,362)
Discount rate (Option-adjusted spread), 20% $ (47,227)