Fair Value of Assets and Liabilities - Valuation Technique (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024 USD ($) item	Dec. 31, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Valuation techniques and significant unobservable inputs
Servicing rights	$ 2,083	$ 2,062	$ 2,236	$ 2,314
Level 3 | Impaired loans | Appraisal value | Property specific adjustment
Valuation techniques and significant unobservable inputs
Individually evaluated	$ 4,033	$ 3,998
Impaired Loans, Measurement Input	0.100	0.100
Level 3 | Impaired loans | Appraisal value | Property specific adjustment | Weighted average
Valuation techniques and significant unobservable inputs
Impaired Loans, Measurement Input	0.100	0.100
Level 3 | Foreclosed assets | Appraisal value | Property specific adjustment
Valuation techniques and significant unobservable inputs
Foreclosed assets	$ 3	$ 32
Discount taken on Foreclosed assets balances	$ 0	$ 0
Level 3 | Servicing rights
Valuation techniques and significant unobservable inputs
Servicing Asset, Valuation Technique [Extensible List]	us-gaap:ValuationTechniqueDiscountedCashFlowMember	us-gaap:ValuationTechniqueDiscountedCashFlowMember
Level 3 | Servicing rights | Prepayment speed assumptions
Valuation techniques and significant unobservable inputs
Servicing rights	$ 1,983	$ 2,052
Level 3 | Servicing rights | Prepayment speed assumptions | Minimum
Valuation techniques and significant unobservable inputs
Servicing Asset, Measurement Input	82	85
Level 3 | Servicing rights | Prepayment speed assumptions | Maximum
Valuation techniques and significant unobservable inputs
Servicing Asset, Measurement Input	172	151
Level 3 | Servicing rights | Prepayment speed assumptions | Weighted average
Valuation techniques and significant unobservable inputs
Servicing Asset, Measurement Input	103	104
Level 3 | Servicing rights | Discount rate
Valuation techniques and significant unobservable inputs
Servicing Asset, Measurement Input	0.111	0.111
Level 3 | Servicing rights | Discount rate | Weighted average
Valuation techniques and significant unobservable inputs
Servicing Asset, Measurement Input	0.111	0.111