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Investments in Servicing Related Assets, Summary (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Servicing Asset [Abstract]    
Unpaid principal balance $ 16,230,454 $ 17,304,133
Carrying value [1] $ 218,688 $ 233,658
Weighted average coupon 3.50% 3.50%
Weighted average maturity [2] 23 years 9 months 18 days 24 years 6 months
Year to date changes in fair value recorded in other income (loss) $ (14,968) $ (7,160)
Mortgage Servicing Rights (MSRs) [Member]    
Servicing Asset [Abstract]    
Unpaid principal balance 16,230,454 17,304,133
Carrying value [1] $ 218,688 $ 233,658
Weighted average coupon 3.50% 3.50%
Weighted average maturity [2] 23 years 9 months 18 days 24 years 6 months
Year to date changes in fair value recorded in other income (loss) $ (14,968) $ (7,160)
[1] See Note 9 regarding the estimation of fair value, which approximates carrying value for all pools.
[2] Weighted average maturity of the underlying residential mortgage loans in the pool is based on the unpaid principal balance.