Pension and Other Postretirement Benefit Plans - Change in Benefit Obligation and Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Retirement Plan [Member]
Projected benefit obligation at beginning of year	$ 17,172	$ 22,109
Interest cost	812	553
Actuarial gain	199	(4,243)
Benefits paid	(1,151)	(1,247)
Projected benefit obligation at end of year	17,032	17,172
Market value of assets at beginning of year	19,065	26,059
Actual return on plan assets	1,306	(5,747)
Benefits paid	(1,151)	(1,247)
Market value of plan assets at end of year	19,220	19,065
Accrued pension asset/liability included in other assets	2,188	1,893
Other Postretirement Benefits Plan [Member]
Projected benefit obligation at beginning of year	7,851	10,853
Service cost	158	269
Interest cost	381	277
Actuarial gain	6	(3,444)
Benefits paid	(124)	(104)
Projected benefit obligation at end of year	8,272	7,851
Market value of assets at beginning of year	0	0
Benefits paid	(124)	(104)
Market value of plan assets at end of year	0	0
Employer contributions	124	104
Accrued pension cost included in other liabilities	8,272	7,851
Directors' Plan [Member]
Projected benefit obligation at beginning of year	1,302	2,010
Service cost	8	11
Interest cost	59	48
Actuarial gain	(285)	(623)
Benefits paid	(68)	(144)
Projected benefit obligation at end of year	1,016	1,302
Market value of assets at beginning of year	0	0
Benefits paid	(68)	(144)
Market value of plan assets at end of year	0	0
Employer contributions	68	144
Accrued pension cost included in other liabilities	$ 1,016	$ 1,302