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Employee Benefit Plans - Funded status of Retirement Income Plan and amounts recognized in consolidated balance sheets (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation at end of year $ 41,038,000 $ 41,120,000  
Retirement Income Plan      
CHANGE IN PROJECTED BENEFIT OBLIGATION:      
Benefit obligation at beginning of year 41,120,000 48,519,000  
Service cost 0 0 $ 0
Interest cost 988,000 1,645,000 1,960,000
Actuarial loss 1,365,000 3,066,000  
Benefits paid (2,435,000) (2,581,000)  
Settlement   (9,529,000)  
Projected benefit obligation at end of year 41,038,000 41,120,000 48,519,000
CHANGE IN PLAN ASSETS:      
Fair value of plan assets at beginning of year 39,068,000 40,142,000  
Actual return on plan assets (1,294,000) 6,586,000  
Employer contribution 0 4,450,000  
Benefits paid (2,435,000) (2,581,000)  
Settlement   (9,529,000)  
Fair value of plan assets at end of year 35,339,000 39,068,000 40,142,000
Funded status at end of year (5,699,000) (2,052,000)  
AMOUNTS (PRE-TAX) RECOGNIZED IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) CONSIST OF:      
Net loss 23,468,000 20,108,000  
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 $ 23,468,000 $ 20,108,000