Mortgage Servicing Rights - Summary of Carrying Value Under the Amortization Method (Details) - Mortgage Servicing Rights - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Mortgage Servicing Rights Accounted for Under the Amortization Method (Rollforward)
Balance at Beginning of Year	$ 21,902	$ 21,451	$ 18,694
Servicing Rights that Resulted From Asset Transfers	528	1,217	4,921
Amortization	(2,229)	(2,595)	(4,227)
Valuation Allowance Recovery (Provision)		1,829	2,063
Balance at End of Year	20,201	21,902	21,451
Valuation Allowance:
Balance at Beginning of Year		(1,829)	(3,892)
Valuation Allowance Recovery (Provision)		1,829	2,063
Balance at End of Year			(1,829)
Fair Value:
Balance at Beginning of Year	27,323	21,451	18,694
Balance at End of Year	$ 26,173	$ 27,323	$ 21,451