Employee Benefit Plans (Details) - USD ($)		12 Months Ended
	Jan. 01, 2020	Dec. 31, 2022	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure
Pension benefits to be amortized from accumulated other comprehensive income (loss) into net periodic cost over the next fiscal year			$ 123,000
Ultimate Health Care Cost Trend Rate			4.00%
Cash and Cash Equivalents			$ 115,193,000	$ 77,612,000	$ 72,194,000	$ 66,146,000
Defined Contribution Plan, Employer Discretionary Contribution Amount			$ 2,000,000.0	1,700,000	1,500,000
Components of net periodic benefit costs:
Defined Benefit Plan Health Care Cost Trend Rate Assumed		5.00%	4.00%
Pension benefits
Defined Benefit Plan Disclosure
Cash and Cash Equivalents			$ 257,000	680,000
Accrued Investment Income Receivable			2,000	58,000
Components of net periodic benefit costs:
Interest cost			438,000	423,000	451,000
Expected return on plan assets			(782,000)	(640,000)	(553,000)
Defined Benefit Plan, Amortization of Gain (Loss)			(78,000)	(104,000)	(102,000)
Settlement of benefit obligation			0	267,000	242,000
Net periodic (benefit) cost			$ (266,000)	$ 154,000	$ 242,000
Discount rate			4.20%	3.55%	3.80%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets			7.50%	7.50%	7.50%
Postretirement benefits
Components of net periodic benefit costs:
Interest cost			$ 3,000	$ 3,000	$ 3,000
Expected return on plan assets			0	0	0
Defined Benefit Plan, Amortization of Gain (Loss)			5,000	5,000	6,000
Settlement of benefit obligation			0	0	0
Net periodic (benefit) cost			$ (3,000)	$ (2,000)	$ (3,000)
Discount rate			4.20%	3.40%	3.80%
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)			$ 1,000
Postretirement benefits | Employees hired before January 1, 2003
Defined Benefit Plan Disclosure
Contribution per eligible employee, coverage basis, consecutive period of highest average monthly compensation			5 years
Contribution per eligible employee, coverage basis, lastest service period			10 years
Postretirement benefits | Employees hired on or after January 1, 2003
Defined Benefit Plan Disclosure
Percentage of annual contribution per eligible employee			2.00%
Postretirement Health Coverage [Member] | Employees retired before January 1, 1993
Defined Benefit Plan Disclosure
Maximum coverage per eligible retiree			100.00%
Minimum
Defined Benefit Plan Disclosure
Defined Contribution Plan, Employer Matching Contribution, Percent	4.00%		3.00%
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent	4.00%		3.00%
Components of net periodic benefit costs:
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year			$ 10,000
Minimum | Equity investment securities (a)
Defined Benefit Plan Disclosure
Actual Plan Asset Allocations			60.00%
Minimum | Investment securities
Defined Benefit Plan Disclosure
Actual Plan Asset Allocations			2000.00%
Minimum | Other Investments [Member]
Defined Benefit Plan Disclosure
Actual Plan Asset Allocations			0.00%
Maximum
Defined Benefit Plan Disclosure
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent	6.00%		5.00%
Components of net periodic benefit costs:
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year			$ 15,000
Maximum | Equity investment securities (a)
Defined Benefit Plan Disclosure
Actual Plan Asset Allocations			75.00%
Maximum | Investment securities
Defined Benefit Plan Disclosure
Actual Plan Asset Allocations			40.00%
Maximum | Other Investments [Member]
Defined Benefit Plan Disclosure
Actual Plan Asset Allocations			15.00%