Federal Income Taxes: Components of The Income Tax Provision (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Income Tax Disclosure [Abstract] | |||
| Current | $ 717 | $ 254 | $ 199 |
| Deferred | 4,170 | 5,602 | (13,742) |
| Total income tax expense (benefit) | $ 4,887 | $ 5,856 | $ (13,543) |