Servicing Rights - Key Assumptions and the Sensitivity of the Fair Value (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Servicing Assets at Fair Value [Line Items]
Balance of mortgage loans serviced for others	$ 1,044,516,000	$ 898,840,000
Weighted average rate of note	4.03%	3.47%
MSR as a percentage of serviced loans	1.87%	2.07%
Mortgage servicing rights
Servicing Assets at Fair Value [Line Items]
Mortgage servicing rights, at fair value	$ 19,564,000	$ 18,635,000	$ 13,724,000	$ 11,218,000
Expected weighted-average life (in years)	10 years 2 months 23 days	9 years 5 months 15 days
Key assumptions:
Constant prepayment rate (percent)	8.48%	6.64%
Constant prepayment rate, impact on fair value from 10% adverse change	$ (1,754,000)	$ (518,000)
Constant prepayment rate, impact on fair value from 25% adverse change	$ (2,552,000)	$ (1,233,000)
Discount rate (percent)	10.98%	11.25%
Discount rate, impact on fair value from 100 basis point increase	$ (811,000)	$ (635,000)
Discount rate, impact on fair value from 200 basis point increase	(1,560,000)	(1,224,000)
Cost to service assumptions ($ per loan)	82	91
Cost to service assumptions, impact on fair value from 10% adverse change	(160,000)	(153,000)
Cost to service assumptions, impact on fair value from 25% adverse change	$ (401,000)	$ (382,000)