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Retirement Plans, Summary of Change in Plan Assets (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Pension Plan [Member]    
Change in plan assets [Roll Forward]    
Fair value of plan assets at beginning of year $ 395,137,000 $ 358,197,000
Actual return on plan assets 50,619,000 51,024,000
Employer contribution 479,000 2,235,000
Gross benefits paid (11,967,000) (11,029,000)
Settlements (3,447,000) (5,290,000)
Fair value of plan assets at end of year 430,821,000 395,137,000
SERP [Member]    
Change in plan assets [Roll Forward]    
Fair value of plan assets at beginning of year 0 0
Actual return on plan assets 0 0
Employer contribution 160,000 146,000
Gross benefits paid (160,000) (146,000)
Settlements 0 0
Fair value of plan assets at end of year 0 0
Other Postretirement Benefits [Member]    
Change in plan assets [Roll Forward]    
Fair value of plan assets at beginning of year 0 0
Actual return on plan assets 0 0
Employer contribution 168,000 139,000
Gross benefits paid (168,000) (139,000)
Settlements 0 0
Fair value of plan assets at end of year $ 0 $ 0