Federal Income Taxes: Reconciliation From Tax At the Statutory Rate to the Income Tax Provision (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Income Tax Disclosure [Abstract] | |||
| Income tax expense at statutory rate | $ 4,412 | $ 4,917 | $ 5,790 |
| Tax exempt interest, net | (103) | (38) | (8) |
| Change in valuation allowance | 0 | (112) | 19 |
| Effective Income Tax Rate Reconciliation, Other Adjustments, Amount | 0 | (39) | 0 |
| Other, net | (597) | 159 | 55 |
| Total income tax expense | $ 3,712 | $ 4,887 | $ 5,856 |