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Fair Value - Schedule of Data and Key Economic Assumptions Related to Mortgage Servicing Rights (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Fair Value Disclosures [Abstract]    
Unpaid principal balance $ 2,469,014 $ 2,540,798
Prepayment rate assumptions:    
Weighted-average 12.35% 12.74%
Estimated impact on fair value of a 10% increase $ (1,302) $ (1,373)
Estimated impact on fair value of a 20% increase $ (2,504) $ (2,639)
Option-adjusted spread:    
Weighted-average 5.50% 5.50%
Estimated impact on fair value of a 100 basis point increase $ (1,112) $ (1,163)
Estimated impact on fair value of a 200 basis point increase $ (2,136) $ (2,232)
Weighted-average coupon interest rate 4.76% 4.78%
Weighted-average servicing fee 0.25% 0.25%
Weighted-average remaining maturity (in months) 348 months 348 months