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Principal-Only Stripped Mortgage-Backed Securities (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2024
USD ($)
Mortgage-backed securities  
Fair Value $ 960,267
Principal-Only-Strip MBS  
Mortgage-backed securities  
Contractual maturities term 10 years
Principal Balance $ 1,121,494
Unearned discounts (193,425)
Cumulative valuation changes 32,198
Fair Value $ 960,267