Employee Benefit Plans (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Employer Contributions, Vesting Period	4 years
Defined Contribution Plan, Cost	$ 1,270,000	$ 1,310,000
Defined Benefit Plan, Benefit Obligation	5,692,000	5,747,000	$ 7,622,000
Defined Benefit Plan, Net Periodic Benefit Cost	68,000	(173,000)
Defined Benefit Plan, Benefits Paid	464,000	$ 476,000
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months	457,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	422,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	433,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Three	442,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Two	443,000
Defined Benefit Plan, Expected Future Benefit Payment	$ 2,040,000
Projected Benefit Obligation, Projected Discount Rate	5.44%	5.18%
Change in Projected Benefit Obligation from Change in Projected Discount Rate	$ 138,000
Defined Benefit Plan, Accumulated Benefit Obligation	$ 5,692,000	$ 5,747,000
Defined Benefit Plan, Target Plan Asset Allocations	100.00%	100.00%
Accumulated Postretirement Benefit Obligation	$ 1,818,000	$ 1,731,000
Supplemental Employee Retirement Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation	3,697,000	3,518,000
Pension and Other Postretirement Benefits Cost (Reversal of Cost)	655,000	461,000
Cash Surrender Value of Life Insurance	46,439,000	43,364,000
Defined Benefit Plan, Net Periodic Benefit Cost	87,000	101,000
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost	7,000	11,000
Defined Benefit Plan, Contributions by Employer	$ 7,000	$ 11,000
Defined Benefit Plan, Percentage of Plan Funded	102.00%	106.70%
Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	0.20%	16.60%
Domestic equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	31.50%	25.10%
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	36.10%	21.70%
Other Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	32.20%	36.60%
JPMCB LDI Diversified Balanced Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Investment concentration	98.00%	96.00%
Maximum [Member] | Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Contribution Percentage	5.00%
Commingled Pensions Trust Fund [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	10.00%
Commingled Pensions Trust Fund [Member] | Minimum [Member] | Global Equity, Global Fixed Income, Real Estate And Cash-Plus [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	35.00%
Commingled Pensions Trust Fund [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	65.00%
Commingled Pensions Trust Fund [Member] | Maximum [Member] | Global Equity, Global Fixed Income, Real Estate And Cash-Plus [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	90.00%
Short-Term Investment Fund (STIF) [Member] | Other Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Investment concentration	98.00%	96.00%
Investment amount	$ 2,600,000	$ 7,000,000.0