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Pension and Other Postretirement Benefit Plans - Change in Benefit Obligation and Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Retirement Plan [Member]      
Projected benefit obligation at beginning of year $ 20,344 $ 23,605  
Interest cost 797 781 $ 864
Actuarial (gain) loss 2,265 (2,389)  
Benefits paid (963) (1,653)  
Projected benefit obligation at end of year 22,443 20,344 23,605
Market value of assets at beginning of year 22,419 22,702  
Actual return on plan assets 4,049 1,370  
Benefits paid (963) (1,653)  
Market value of plan assets at end of year 25,505 22,419 22,702
Accrued pension asset/liability included in other assets 3,062 2,075  
Other Postretirement Benefits Plan [Member]      
Projected benefit obligation at beginning of year 8,518 9,104  
Service cost 280 350 316
Interest cost 341 307 305
Actuarial (gain) loss (301) (1,155)  
Benefits paid (76) (88)  
Projected benefit obligation at end of year 8,762 8,518 9,104
Market value of assets at beginning of year 0 0  
Benefits paid (76) (88)  
Market value of plan assets at end of year 0 0 0
Employer contributions 76 88  
Accrued pension cost included in other liabilities (8,762) (8,518)  
Directors' Plan [Member]      
Projected benefit obligation at beginning of year 2,265 2,425  
Service cost 39 42 42
Interest cost 86 78 89
Actuarial (gain) loss 44 (184)  
Benefits paid (144) (96)  
Projected benefit obligation at end of year 2,290 2,265 2,425
Market value of assets at beginning of year 0 0  
Benefits paid (144) (96)  
Market value of plan assets at end of year 0 0 $ 0
Employer contributions 144 96  
Accrued pension cost included in other liabilities $ (2,290) $ (2,265)