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Investments: Narrative (Details)
1 Months Ended 3 Months Ended 6 Months Ended
Jan. 31, 2020
USD ($)
Jun. 30, 2021
USD ($)
securities
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
securities
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
securities
Investments [Abstract]            
Unrealized Loss | securities   38   38   20
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | securities   13   13   18
Investments pledged as collateral for FHLB advances   50.00%   50.00%    
Investments pledged as collateral for public deposits   $ 23,000,000.0   $ 23,000,000.0   $ 23,400,000
Proceeds from sales, calls and maturities of investments available-for-sale   2,000,000.0 $ 9,600,000 4,000,000 $ 9,567,000  
Gain on sale of investments available-for-sale   0 $ 69,000 0 69,000  
Payments to Acquire Marketable Securities $ 2,400,000     74,084,000 $ 6,928,000  
Investments held-to-maturity   $ 2,419,000   $ 2,419,000   $ 2,418,000