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Employee Benefit Plans (Narrative) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) $ / Family | Dec. 31, 2017 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jun. 30, 2016 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
401(k) deferred compensation and profit sharing plan, company contributions | $ 1,438 | $ 1,328 |  | $ 1,121 |
Annual losses per covered family | $ / Family | 175,000 |  |  |  |
Annual deductible per covered family | $ / Family | 255,000 |  |  |  |
Charges to earnings for self-insurance reserve | $ 3,724 | 4,192 |  | 3,153 |
Pension expense | 72 | 63 |  |  |
River Valley | Pentegra DB Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total contributions under defined benefit plan as reported on Form 5500 |  |  | $ 367,119 |  | $ 153,186
Multiemployer plan, maximum percentage of employer's contributions |  |  | 5.00% |  |
Postretirement Medical and Life Benefit Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Estimated future employer contributions in 2019 | 92 |  |  |  |
Certain directors and officers |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Accrued benefits payable | 2,046 | 1,896 |  |  |
Deferred compensation expense | 324 | 187 |  | $ 297 |
Certain officers |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Accrued benefits payable | $ 0 | 84 |  |  |
Deferred compensation expense |  | $ 48 |  |  |

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