Employee Benefit Plans (Changes in Benefit Obligation, Fair Value of Assets and Funded Status) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Change in plan assets:
Beginning balance	$ 11,606,000
Ending balance	10,692,000	$ 11,606,000
Amounts recognized in Accumulated Other Comprehensive Loss:
Total	3,872,000	3,958,000	$ 3,711,000	$ 4,256,000
Pension benefits
Change in benefit obligation:
Beginning balance	12,668,000	10,995,000
Interest cost	326,000	438,000	423,000
Plan participants’ contributions	0	0
Actuarial loss	1,708,000	1,696,000
Benefit payments	238,000	461,000
Settlements	(2,154,000)	0
Ending balance	12,310,000	12,668,000	10,995,000
Change in plan assets:
Beginning balance	11,866,000	10,234,000
Actual return on plan assets	1,378,000	2,093,000
Employer contributions	0	0	3,200,000
Benefit payments	(238,000)	(461,000)
Settlements	(2,154,000)	0
Ending balance	10,852,000	11,866,000	10,234,000
Funded status at December 31	(1,458,000)	(802,000)
Amounts recognized in Consolidated Balance Sheets:
Accrued benefit liability	(1,458,000)	(802,000)
Net amount recognized	(1,458,000)	(802,000)
Amounts recognized in Accumulated Other Comprehensive Loss:
Unrecognized prior service cost	0	0
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax	3,918,000	4,004,000
Total	$ 3,918,000	$ 4,004,000
Discount Rate	2.38%	3.12%
Defined Benefit Plan, Accumulated Benefit Obligation	$ 12,310,000	$ 12,668,000
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax	765,000	(266,000)	154,000
Settlement of benefit obligation	1,054,000	0	267,000
Other Postretirement Benefit Plans, Defined Benefit [Member]
Change in benefit obligation:
Beginning balance	75,000	83,000
Interest cost	2,000	3,000	3,000
Plan participants’ contributions	59,000	121,000
Actuarial loss	6,000	0
Benefit payments	71,000	132,000
Settlements	0	0
Ending balance	71,000	75,000	83,000
Change in plan assets:
Beginning balance	0	0
Actual return on plan assets	0	0
Employer contributions	12,000	11,000
Benefit payments	(71,000)	(132,000)
Settlements	0	0
Ending balance	0	0	0
Funded status at December 31	(71,000)	(75,000)
Amounts recognized in Consolidated Balance Sheets:
Accrued benefit liability	(71,000)	(75,000)
Net amount recognized	(71,000)	(75,000)
Amounts recognized in Accumulated Other Comprehensive Loss:
Unrecognized prior service cost	0	0
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax	(39,000)	(48,000)
Total	$ (39,000)	$ (48,000)
Discount Rate	2.38%	3.12%
Defined Benefit Plan, Accumulated Benefit Obligation	$ 71,000	$ 75,000
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax	(3,000)	(3,000)	(2,000)
Settlement of benefit obligation	0	0	$ 0
Mutual funds - taxable income
Change in plan assets:
Beginning balance	3,163,000
Ending balance	2,898,000	3,163,000
Mutual Funds - Equity [Member]
Change in plan assets:
Beginning balance	8,443,000
Ending balance	7,794,000	8,443,000
Level 1 | Recurring Basis
Change in plan assets:
Beginning balance	11,606,000
Ending balance	10,692,000	11,606,000
Level 1 | Recurring Basis | Mutual funds - taxable income
Change in plan assets:
Beginning balance	3,163,000
Ending balance	2,898,000	3,163,000
Level 1 | Recurring Basis | Mutual Funds - Equity [Member]
Change in plan assets:
Beginning balance	8,443,000
Ending balance	7,794,000	8,443,000
Level 2 | Recurring Basis
Change in plan assets:
Beginning balance	0
Ending balance	0	0
Level 2 | Recurring Basis | Mutual funds - taxable income
Change in plan assets:
Beginning balance	0
Ending balance	0	0
Level 2 | Recurring Basis | Mutual Funds - Equity [Member]
Change in plan assets:
Beginning balance	0
Ending balance	$ 0	$ 0