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Pension and Other Postretirement Benefits - The Components of the Net Pension Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Retirement Plan [Member]      
Interest cost $ 797 $ 781 $ 864
Amortization of unrecognized (gain) loss 269 621 697
Expected return on plan assets (1,088) (1,452) (1,392)
Net pension (benefit) expense (22) (50) 169
Current year actuarial (gain) loss (696) (2,307) (1,192)
Amortization of actuarial gain (loss) (269) (621) (697)
Total recognized in other comprehensive income (965) (2,928) (1,889)
Total recognized in net pension cost (benefit) and other comprehensive loss (987) (2,978) (1,720)
Amortization of actuarial gain (loss) 269 621 697
Other Postretirement Benefits Plan [Member]      
Interest cost 341 307 305
Amortization of unrecognized (gain) loss   33 0
Net pension (benefit) expense 536 605 536
Current year actuarial (gain) loss (301) (1,155) 587
Amortization of actuarial gain (loss)   33 0
Total recognized in other comprehensive income (216) (1,103) 672
Total recognized in net pension cost (benefit) and other comprehensive loss 320 (498) 1,208
Service cost 280 350 316
Amortization of past service credit (85) (85) (85)
Amortization of prior service credit 85 85 85
Amortization of actuarial gain (loss)   (33) 0
Directors' Plan [Member]      
Interest cost 86 78 89
Amortization of unrecognized (gain) loss (141) (91) (92)
Net pension (benefit) expense (16) 41 79
Current year actuarial (gain) loss 44 (184) (24)
Amortization of actuarial gain (loss) (141) (91) (92)
Total recognized in other comprehensive income 185 (105) 28
Total recognized in net pension cost (benefit) and other comprehensive loss 169 (64) 107
Service cost 39 42 42
Amortization of past service credit   12 40
Amortization of prior service credit   (12) (40)
Amortization of actuarial gain (loss) $ 141 $ 91 $ 92