Fair Value: Balance Sheet Grouping (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments available-for-sale	$ 204,975	$ 217,778
Investments held-to-maturity	2,450	2,444
FHLB stock	6,803	7,512
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash on hand and in banks	8,074	7,722
Interest-earning deposits with banks	49,618	16,598
Investments available-for-sale	39,194	39,186
Investments held-to-maturity	0	0
Loans receivable, net	0	0
FHLB stock	0	0
Accrued interest receivable	0	0
Derivative fair value asset	0	0
Deposits	684,992	782,600
Certificates of deposit, retail	0	0
Brokered deposits	0	0
Advances from the FHLB	0	0
Accrued interest payable	0	0
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash on hand and in banks	0	0
Interest-earning deposits with banks	0	0
Investments available-for-sale	165,781	178,592
Investments held-to-maturity	2,450	2,444
Loans receivable, net	0	0
FHLB stock	6,803	7,512
Accrued interest receivable	7,263	6,513
Derivative fair value asset	10,698	10,485
Deposits	0	0
Certificates of deposit, retail	343,663	254,004
Brokered deposits	175,808	124,843
Advances from the FHLB	124,998	144,999
Accrued interest payable	2,646	328
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash on hand and in banks	0	0
Interest-earning deposits with banks	0	0
Investments available-for-sale	0	0
Investments held-to-maturity	0	0
Loans receivable, net	1,101,010	1,120,403
FHLB stock	0	0
Accrued interest receivable	0	0
Derivative fair value asset	0	0
Deposits	0	0
Certificates of deposit, retail	0	0
Brokered deposits	0	0
Advances from the FHLB	0	0
Accrued interest payable	0	0
Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash on hand and in banks	8,074	7,722
Interest-earning deposits with banks	49,618	16,598
Investments available-for-sale	204,975	217,778
Investments held-to-maturity	2,450	2,444
Loans receivable, net	1,168,079	1,167,083
FHLB stock	6,803	7,512
Accrued interest receivable	7,263	6,513
Derivative fair value asset	10,698	10,485
Deposits	684,992	782,600
Certificates of deposit, retail	349,446	262,554
Brokered deposits	175,972	124,886
Advances from the FHLB	125,000	145,000
Accrued interest payable	2,646	328
Estimated Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash on hand and in banks	8,074	7,722
Interest-earning deposits with banks	49,618	16,598
Investments available-for-sale	204,975	217,778
Investments held-to-maturity	2,450	2,444
Loans receivable, net	1,101,010	1,120,403
FHLB stock	6,803	7,512
Accrued interest receivable	7,263	6,513
Derivative fair value asset	10,698	10,485
Deposits	684,992	782,600
Certificates of deposit, retail	343,663	254,004
Brokered deposits	175,808	124,843
Advances from the FHLB	124,998	144,999
Accrued interest payable	$ 2,646	$ 328