Employee Benefit Plans - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($) $ / Family	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jun. 30, 2022 USD ($)
Defined Benefit Plan Disclosure [Line Items]
401(k) deferred compensation and profit sharing plan, company contributions	$ 2,381	$ 2,356	$ 2,152
Annual losses per covered family (in dollars per family) | $ / Family	175
Charges to earnings for self-insurance reserve	$ 7,303	7,227	7,619
Postretirement Medical and Life Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Estimated future employer contributions in 2025	112
Multi-Employer Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Pension withdrawal liability	0	$ 101
Multi-Employer Pension Plan | Pentegra DB Plan
Defined Benefit Plan Disclosure [Line Items]
Multiemployer plan, total contributions				$ 142,405
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
Certain directors and officers
Defined Benefit Plan Disclosure [Line Items]
Accrued benefits payable	2,485	2,651
Deferred compensation expense	$ 81	$ 261	$ 1,143