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Investments in RMBS, Summary (Details)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
Security
Dec. 31, 2024
USD ($)
Security
Residential Mortgage-Backed Securities [Abstract]    
Carrying value $ 1,191,478 $ 1,122,420
RMBS [Member]    
Residential Mortgage-Backed Securities [Abstract]    
Original face value 1,379,028 1,302,160
Book value 1,169,572 1,139,262
Gross unrealized gains 24,179 5,496
Gross unrealized losses (2,273) (22,338)
Carrying value [1] $ 1,191,478 $ 1,122,420
Number of securities | Security 103 95
Weighted average coupon 4.98% 4.80%
Weighted average yield [2] 5.08% 4.91%
Weighted average maturity 27 years 28 years
Fannie Mae [Member] | Fair Value through OCI [Member]    
Residential Mortgage-Backed Securities [Abstract]    
Original face value $ 150,782 $ 160,092
Book value 112,513 131,441
Gross unrealized gains 2,539 492
Gross unrealized losses (341) (2,282)
Carrying value [1],[3] $ 114,711 $ 129,651
Number of securities | Security 10 11
Weighted average coupon 4.67% 4.62%
Weighted average yield [2] 4.83% 4.79%
Weighted average maturity 26 years 27 years
Fannie Mae [Member] | Fair Value through Earnings [Member]    
Residential Mortgage-Backed Securities [Abstract]    
Original face value $ 440,028 $ 335,927
Book value 387,339 299,453
Gross unrealized gains 8,354 1,870
Gross unrealized losses (565) (5,375)
Carrying value [1],[3] $ 395,128 $ 295,948
Number of securities | Security 32 24
Weighted average coupon 5.05% 4.81%
Weighted average yield [2] 5.15% 4.94%
Weighted average maturity 28 years 28 years
Freddie Mac [Member] | Fair Value through OCI [Member]    
Residential Mortgage-Backed Securities [Abstract]    
Original face value $ 125,240 $ 157,618
Book value 95,466 127,839
Gross unrealized gains 970 0
Gross unrealized losses (589) (5,362)
Carrying value [1],[3] $ 95,847 $ 122,477
Number of securities | Security 10 12
Weighted average coupon 4.68% 4.34%
Weighted average yield [2] 4.76% 4.44%
Weighted average maturity 26 years 27 years
Freddie Mac [Member] | Fair Value through Earnings [Member]    
Residential Mortgage-Backed Securities [Abstract]    
Original face value $ 662,978 $ 648,523
Book value 574,254 580,529
Gross unrealized gains 12,316 3,134
Gross unrealized losses (778) (9,319)
Carrying value [1],[3] $ 585,792 $ 574,344
Number of securities | Security 51 48
Weighted average coupon 5.05% 4.93%
Weighted average yield [2] 5.15% 5.03%
Weighted average maturity 28 years 28 years
[1] See Note 9 regarding the estimation of fair value, which approximates carrying value for all securities.
[2] The weighted average yield is based on the most recent gross monthly interest income, which is then annualized and divided by the book value of settled securities.
[3] The Company used an implied AAA rating for the Agency RMBS.