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Employee Benefit Plans - Funded status of Retirement Income Plan and amounts recognized in consolidated balance sheets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation at end of year $ 41,120 $ 48,519  
CHANGE IN PROJECTED BENEFIT OBLIGATION:      
Pension settlement loss (3) 4,660    
Retirement Income Plan      
CHANGE IN PROJECTED BENEFIT OBLIGATION:      
Benefit obligation at beginning of year 48,519 43,417  
Service cost 0 0 $ 0
Interest cost 1,645 1,960 1,832
Amendments 0 0  
Actuarial loss 3,066 5,521  
Benefits paid (2,581) (2,379)  
Settlement (9,529)    
Projected benefit obligation at end of year 41,120 48,519 43,417
Pension settlement loss (3) 4,660    
CHANGE IN PLAN ASSETS:      
Fair value of plan assets at beginning of year 40,142 38,364  
Actual return on plan assets 6,586 4,157  
Employer contribution 4,450 0  
Benefits paid (2,581) (2,379)  
Settlement (9,529)    
Fair value of plan assets at end of year 39,068 40,142 38,364
Funded status at end of year (2,052) (8,377)  
AMOUNTS (PRE-TAX) RECOGNIZED IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) CONSIST OF:      
Net loss 20,108 27,693  
Prior service cost (credit) 0 0  
Net transition obligation (asset) 0 0 $ 0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax, Total $ 20,108 $ 27,693