Servicing Rights - Key Assumptions and the Sensitivity of the Fair Value (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2025 USD ($) $ / loan	Dec. 31, 2024 USD ($) $ / loan	Jun. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Servicing Assets at Fair Value [Line Items]
Balance of mortgage loans serviced for others	$ 1,601,174	$ 1,460,720
Weighted average rate of note (percent)	4.69%	4.46%
MSR as a percentage of serviced loans	1.74%	1.81%
Mortgage servicing rights
Servicing Assets at Fair Value [Line Items]
Fair value of MSRs	$ 27,796	$ 26,439	$ 27,506	$ 21,570	$ 21,077	$ 19,564
Expected weighted-average life (in years)	9 years 1 month 13 days	9 years 6 months 3 days
Key assumptions:
Constant prepayment rate (percent)	9.60%	9.09%
Constant prepayment rate, impact on fair value from 10% adverse change	$ (980)	$ (935)
Constant prepayment rate, impact on fair value from 25% adverse change	$ (2,331)	$ (2,222)
Discount rate (percent)	10.97%	10.99%
Discount rate, impact on fair value from 100 basis point increase	$ (1,070)	$ (1,592)
Discount rate, impact on fair value from 200 basis point increase	$ (2,053)	$ (2,544)
Cost to service assumptions ($ per loan) | $ / loan	81	81
Cost to service assumptions, impact on fair value from 10% adverse change	$ (235)	$ (235)
Cost to service assumptions, impact on fair value from 25% adverse change	$ (589)	$ (588)