Fair Value Measurements -Schedule of Fair Value Hierarchy for Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
FINANCIAL ASSETS:
Available-for-sale securities	$ 7,637		$ 7,790
Held-to-maturity securities	1,552		1,712
Mortgage servicing rights	4,305	$ 4,638	4,769	$ 4,665	$ 4,540	$ 4,632
Level 1
FINANCIAL ASSETS:
Cash and cash equivalents	101,156		43,641
Available-for-sale securities	0		0
Held-to-maturity securities	0		0
Loans held-for-sale	0		0
Loans held-for-portfolio, net	0		0
Mortgage servicing rights	0		0
FINANCIAL LIABILITIES:
Time deposits	0		0
Borrowings	0		0
Subordinated notes	0		0
Level 2
FINANCIAL ASSETS:
Cash and cash equivalents	0		0
Available-for-sale securities	7,637		7,790
Held-to-maturity securities	1,552		1,712
Loans held-for-sale	271		487
Loans held-for-portfolio, net	0		0
Mortgage servicing rights	0		0
FINANCIAL LIABILITIES:
Time deposits	291,383		296,575
Borrowings	25,000		25,000
Subordinated notes	12,620		12,653
Level 3
FINANCIAL ASSETS:
Cash and cash equivalents	0		0
Available-for-sale securities	0		0
Held-to-maturity securities	0		0
Loans held-for-sale	0		0
Loans held-for-portfolio, net	872,999		850,813
Mortgage servicing rights	4,305		4,769
FINANCIAL LIABILITIES:
Time deposits	0		0
Borrowings	0		0
Subordinated notes	0		0
Carrying Value
FINANCIAL ASSETS:
Cash and cash equivalents	101,156		43,641
Available-for-sale securities	7,637		7,790
Held-to-maturity securities	1,899		2,130
Loans held-for-sale	271		487
Loans held-for-portfolio, net	901,151		891,672
Mortgage servicing rights	4,305		4,769
FINANCIAL LIABILITIES:
Time deposits	291,052		295,822
Borrowings	25,000		25,000
Subordinated notes	11,791		11,759
Estimated Fair Value
FINANCIAL ASSETS:
Cash and cash equivalents	101,156		43,641
Available-for-sale securities	7,637		7,790
Held-to-maturity securities	1,552		1,712
Loans held-for-sale	271		487
Loans held-for-portfolio, net	872,999		850,813
Mortgage servicing rights	4,305		4,769
FINANCIAL LIABILITIES:
Time deposits	291,383		296,575
Borrowings	25,000		25,000
Subordinated notes	$ 12,620		$ 12,653