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Investments: Narrative (Details)
1 Months Ended 3 Months Ended
Jan. 31, 2020
USD ($)
Mar. 31, 2023
USD ($)
securities
Mar. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
securities
Debt Securities, Available-for-sale [Line Items]        
Securities in unrealized loss position | securities   121   123
Securities in unrealized loss position for 12 months or more | securities   92   62
Investments pledged as collateral for FHLB advances   50.00%    
Investments pledged as collateral for public deposits   $ 27,400,000   $ 21,000,000
Gain on sale of investments available-for-sale     $ 0  
Proceeds from calls and maturities of investments available-for-sale   0 2,382,000  
Payments to acquire marketable securities $ 2,400,000 0 25,854,000  
Investments held-to-maturity   2,439,000   2,444,000
Principal repayments on investments available-for-sale     $ 30,000  
Fair value of securities   202,868,000   207,998,000
Corporate bonds        
Debt Securities, Available-for-sale [Line Items]        
Fair value of securities   28,439,000   30,480,000
Corporate bonds | Subordinated Debt        
Debt Securities, Available-for-sale [Line Items]        
Fair value of securities       22,000,000
Two Large West Coast Financial Institutions | Corporate bonds | Subordinated Debt        
Debt Securities, Available-for-sale [Line Items]        
Fair value of securities   5,500,000   $ 8,000,000
Loss on securities   $ 2,100,000