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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, 2024
Dec. 31, 2023
Retirement Plan [Member]    
Projected benefit obligation at beginning of year $ 17,032 $ 17,172
Interest cost 774 812
Actuarial gain (789) 199
Benefits paid (1,209) (1,151)
Projected benefit obligation at end of year 15,808 17,032
Market value of assets at beginning of year 19,220 19,065
Actual return on plan assets (89) 1,306
Benefits paid (1,209) (1,151)
Market value of plan assets at end of year 17,922 19,220
Accrued pension asset/liability included in other assets 2,114 2,188
Other Postretirement Benefits Plan [Member]    
Projected benefit obligation at beginning of year 8,272 7,851
Service cost 164 158
Interest cost 385 381
Actuarial gain (20) 6
Benefits paid (146) (124)
Projected benefit obligation at end of year 8,655 8,272
Market value of assets at beginning of year 0 0
Benefits paid (146) (124)
Market value of plan assets at end of year 0 0
Employer contributions 146 124
Accrued pension cost included in other liabilities 8,655 8,272
Directors' Plan [Member]    
Projected benefit obligation at beginning of year 1,016 1,302
Service cost 9 8
Interest cost 45 59
Actuarial gain (75) (285)
Benefits paid (24) (68)
Projected benefit obligation at end of year 971 1,016
Market value of assets at beginning of year 0 0
Benefits paid (24) (68)
Market value of plan assets at end of year 0 0
Employer contributions 24 68
Accrued pension cost included in other liabilities $ 971 $ 1,016