Pension and Other Postretirement Benefit Plans - Change in Benefit Obligation and Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Retirement Plan [Member]
Projected benefit obligation at beginning of year	$ 22,109	$ 24,227
Interest cost	553	512
Actuarial gain	(4,243)	(1,562)
Benefits paid	(1,247)	(1,068)
Projected benefit obligation at end of year	17,172	22,109
Market value of assets at beginning of year	26,059	27,720
Actual return on plan assets	(5,747)	(593)
Benefits paid	(1,247)	(1,068)
Market value of plan assets at end of year	19,065	26,059
Accrued pension asset/liability included in other assets	1,893	3,950
Other Postretirement Benefits Plan [Member]
Projected benefit obligation at beginning of year	10,853	10,799
Service cost	269	293
Interest cost	277	233
Actuarial gain	(3,444)	(370)
Benefits paid	(104)	(102)
Projected benefit obligation at end of year	7,851	10,853
Market value of assets at beginning of year	0	0
Benefits paid	(104)	(102)
Market value of plan assets at end of year	0	0
Employer contributions	104	102
Accrued pension cost included in other liabilities	7,851	10,853
Directors' Plan [Member]
Projected benefit obligation at beginning of year	2,010	2,276
Service cost	11	16
Interest cost	48	46
Actuarial gain	(623)	(184)
Benefits paid	(144)	(144)
Projected benefit obligation at end of year	1,302	2,010
Market value of assets at beginning of year	0	0
Benefits paid	(144)	(144)
Market value of plan assets at end of year	0	0
Employer contributions	144	144
Accrued pension cost included in other liabilities	$ 1,302	$ 2,010