Retirement Plans (Changes in Benefit Obligations, Components of Benefit Costs, Weighted-Average Assumptions, and Plan Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Assumptions (end of period):
Discount rate used in determining benefit obligation	2.52%	2.12%
Reconciliation of funded status (end of period):
Accumulated benefit obligation	$ (12,400)	$ (13,252)
Projected benefit obligation	(12,400)	(13,252)
Fair value of plan assets	12,226	11,393
Funded status	(174)	(1,859)
Net actuarial loss	(3,253)	(4,672)
Accumulated other comprehensive loss	(3,253)	(4,672)
Prepaid pension cost	3,079	2,813
Net amount recognized as of December 31	(174)	(1,859)
Changes in projected benefit obligation:
Benefit obligation as of beginning of period	13,252	12,376
Interest cost	271	355
Actuarial liability loss	(284)	1,352
Benefits paid	(839)	(831)
Benefit obligation as of end of period	12,400	13,252	$ 12,376
Change in plan assets:
Fair value of plan assets as of beginning of period	11,393	10,988
Actual return on plan assets (net of expenses)	1,672	1,236
Employer contributions	0	0
Benefits Paid	(839)	(831)
Fair value of plan assets as of end of period	12,226	11,393	10,988
Net periodic pension cost:
Service cost - benefits earned during the period		0	$ 0
Interest cost	271	355
Expected return on plan assets	(709)	(684)
Recognized actuarial loss	173	138
Net periodic pension cost	$ (265)	$ (191)
Discount rate	2.12%	2.98%
Expected return on plan assets	6.50%	6.50%