Mortgage Servicing Rights and Mortgage Servicing Liabilities - Mortgage Servicing Liabilities Carried at FV (Details) - Mortgage servicing liabilities - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Amortized cost:
Balance at beginning of quarter	$ 1,643	$ 1,708	$ 1,683	$ 1,805
Changes in valuation inputs used in valuation model	(24)	46	2	34
Other changes in fair value	(26)	(36)	(92)	(121)
Total change in fair value	(50)	10	(90)	(87)
Balance at end of quarter	1,593	1,718	1,593	1,718
Unpaid principal balance of underlying loans at end of quarter	$ 17,457	$ 20,179	$ 17,457	$ 20,179