Borrowings, FHLB Stock and Subordinated Notes - Schedule of FHLB Advances (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Short-term Debt [Line Items]
Short-term advances (one year or less)	$ 15,000
Borrowings	25,000	$ 25,000
FHLB of Des Moines
Short-term Debt [Line Items]
Short-term advances (one year or less)	15,000	0
Long-term advances (over one year)	10,000	25,000
Borrowings	25,000	25,000
FHLB of Des Moines | Fixed Rate:
Short-term Debt [Line Items]
Borrowings	$ 25,000	$ 25,000
Weighted average interest rate	4.16%	4.16%
FHLB of Des Moines | Fixed Rate: | Interest rates ranging from
Short-term Debt [Line Items]
Interest rates	4.06%	4.06%
FHLB of Des Moines | Fixed Rate: | Interest rates ranging to
Short-term Debt [Line Items]
Interest rates	4.27%	4.27%