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Investment Securities - Available-for-Sale RMBS (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 103,027 $ 123,292
Credit Loss Allowance 0 0
Net Basis 103,027 123,292
Gross Unrealized Gains 41,052 44,123
Gross Unrealized Losses (99) (66)
Net Fair Value Adjustment 40,953 44,057
Fair Value $ 143,980 $ 167,349
Available-for-sale | One-month LIBOR    
Debt Securities, Available-for-sale [Line Items]    
Effective variable rate basis 0.101%  
RMBS | Available-for-sale | B-    
Debt Securities, Available-for-sale [Line Items]    
Weighted Average Coupon 1.30%  
WAL (Years) 5 years 3 months 18 days