Servicing Rights - Key Assumptions and the Sensitivity of the Fair Value (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Servicing Assets at Fair Value [Line Items]
Balance of mortgage loans serviced for others	$ 1,060,007,000	$ 1,044,516,000
Weighted average rate of note (percent)	4.11%	4.03%
MSR as a percentage of serviced loans	1.89%	1.87%
Mortgage servicing rights
Servicing Assets at Fair Value [Line Items]
Fair value of MSRs	$ 20,055,000	$ 19,564,000	$ 18,303,000	$ 18,635,000
Expected weighted-average life (in years)	10 years 2 months 23 days	10 years 2 months 23 days
Key assumptions:
Constant prepayment rate (percent)	8.35%	8.48%
Constant prepayment rate, impact on fair value from 10% adverse change	$ (680,000)	$ (1,754,000)
Constant prepayment rate, impact on fair value from 25% adverse change	$ (1,623,000)	$ (2,552,000)
Discount rate (percent)	10.98%	10.98%
Discount rate, impact on fair value from 100 basis point increase	$ (841,000)	$ (811,000)
Discount rate, impact on fair value from 200 basis point increase	(1,618,000)	(1,560,000)
Cost to service assumptions ($ per loan)	82	82
Cost to service assumptions, impact on fair value from 10% adverse change	(162,000)	(160,000)
Cost to service assumptions, impact on fair value from 25% adverse change	$ (405,000)	$ (401,000)