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Federal Income Taxes: Reconciliation From Tax At the Statutory Rate to the Income Tax Provision (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]    
Income tax expense at statutory rate $ 2,715 $ 3,904
Tax exempt interest, net (25) (53)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Life Insurance, Amount (203) (150)
Other, net 75 (8)
Total income tax expense $ 2,562 $ 3,693