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Employee Benefit Plans (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
$ / Family
Dec. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jun. 30, 2018
USD ($)
Defined Benefit Plan Disclosure [Line Items]          
401(k) deferred compensation and profit sharing plan, company contributions $ 1,956 $ 1,755   $ 1,438  
Annual losses per covered family | $ / Family 175        
Charges to earnings for self-insurance reserve $ 5,234 5,495   3,724  
Postretirement Medical and Life Benefit Plan          
Defined Benefit Plan Disclosure [Line Items]          
Estimated future employer contributions in 2021 96        
Multi-Employer Pension Plan | Pentegra DB Plan          
Defined Benefit Plan Disclosure [Line Items]          
Multiemployer plan, total contributions     $ 138,322   $ 164,570
Multiemployer plan, maximum percentage of employer's contributions     5.00%    
Multi-Employer Pension Plan | River Valley          
Defined Benefit Plan Disclosure [Line Items]          
Pension expense 42 84      
Certain directors and officers          
Defined Benefit Plan Disclosure [Line Items]          
Accrued benefits payable 2,089 2,043      
Deferred compensation expense $ 304 $ 243   $ 324