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Fair Value - Sensitivity Analysis (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Fair Value Disclosures [Abstract]  
Weighted average prepayment speeds, 10% $ (116,951)
Weighted average prepayment speeds, 20% (224,689)
Discount rate (Option-adjusted spread), 10% (49,463)
Discount rate (Option-adjusted spread), 20% $ (95,885)