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Investment Securities - Available-for-Sale RMBS (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 98,737 $ 103,027
Credit Loss Allowance 0 0
Net Basis 98,737 103,027
Gross Unrealized Gains 35,708 41,052
Gross Unrealized Losses (39) (99)
Net Fair Value Adjustment 35,669 40,953
Fair Value $ 134,406 $ 143,980
Available-for-sale | One-month LIBOR    
Debt Securities, Available-for-sale [Line Items]    
Effective variable rate basis 0.452%  
RMBS | Available-for-sale | B-    
Debt Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 1.50%  
WAL (Years) 5 years 6 months