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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Income tax expense at statutory rate $ 3,904 $ 4,697 $ 4,412
Tax exempt interest, net (53) (107) (103)
Benefit of lower federal tax bracket 0 (98) 0
DTA revaluation 0 807 0
Other, net (158) (357) (597)
Total income tax expense $ 3,693 $ 4,942 $ 3,712