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Employee Benefit Plans (Narrative) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 USD ($) $ / Family | Dec. 31, 2022 USD ($) | Jun. 30, 2022 USD ($) | Dec. 31, 2021 USD ($) | Jun. 30, 2021 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
401(k) deferred compensation and profit sharing plan, company contributions | $ 2,356 | $ 2,152 |  | $ 2,050 |
Annual losses per covered family (in dollars per family) | $ / Family | 175 |  |  |  |
Charges to earnings for self-insurance reserve | $ 7,227 | 7,619 |  | 5,520 |
Postretirement Medical and Life Benefit Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Estimated future employer contributions in 2024 | 169 |  |  |  |
Multi-Employer Pension Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Pension withdrawal liability | $ 101 |  |  |  |
Multi-Employer Pension Plan | Pentegra DB Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Multiemployer plan, total contributions |  |  | $ 142,405 |  | $ 248,563
Multiemployer plan, maximum percentage of employer's contributions | 5.00% |  |  |  |
Multi-Employer Pension Plan | River Valley |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Pension expense | $ 141 | 53 |  |  |
Certain directors and officers |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Accrued benefits payable | 2,651 | 3,212 |  |  |
Deferred compensation expense | $ 261 | $ 1,143 |  | $ 302 |

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