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Employee Benefit Plans (Narrative) (Details)
$ in Thousands
 12 Months Ended
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