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Benefit Plans - Fair Value Measurement of Plan Assets (Details) - Pension Plan [Member] - USD ($)	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Benefit Plans
Fair value of plan assets	$ 72,912,000	$ 77,603,000	$ 78,149,000
Percentage of total	100.00%	100.00%
Cash and cash equivalents
Benefit Plans
Fair value of plan assets	$ 3,112,000	$ 2,353,000
Fixed Income Investments [Member]
Benefit Plans
Percentage of total	84.80%	86.40%
US Treasury Securities [Member]
Benefit Plans
Fair value of plan assets	$ 10,398,000	$ 11,354,000
US Government Agencies Debt Securities [Member]
Benefit Plans
Fair value of plan assets	5,089,000	5,899,000
Debt Security, Corporate, US [Member]
Benefit Plans
Fair value of plan assets	44,184,000	47,546,000
Municipal Bonds [Member]
Benefit Plans
Fair value of plan assets	345,000	379,000
Sovereign Debt Securities [Member]
Benefit Plans
Fair value of plan assets	1,830,000	1,901,000
Equity - large-cap exchange-traded fund
Benefit Plans
Fair value of plan assets	4,799,000	5,311,000
Equity - large- and mid-cap exchange-traded funds
Benefit Plans
Fair value of plan assets	839,000
Equity - mid-cap exchange-traded funds
Benefit Plans
Fair value of plan assets	901,000
Equity - large- and mid-cap exchange-traded funds
Benefit Plans
Fair value of plan assets		844,000
Equity - small-cap exchange-traded funds
Benefit Plans
Fair value of plan assets		394,000
Equity - international funds
Benefit Plans
Fair value of plan assets	1,415,000	1,622,000
Fair Value, Inputs, Level 1 [Member]
Benefit Plans
Fair value of plan assets	12,896,000	12,425,000
Fair Value, Inputs, Level 1 [Member] | Cash and cash equivalents
Benefit Plans
Fair value of plan assets	3,112,000	2,353,000
Fair Value, Inputs, Level 1 [Member] | Sovereign Debt Securities [Member]
Benefit Plans
Fair value of plan assets	1,830,000	1,901,000
Fair Value, Inputs, Level 1 [Member] | Equity - large-cap exchange-traded fund
Benefit Plans
Fair value of plan assets	4,799,000	5,311,000
Fair Value, Inputs, Level 1 [Member] | Equity - large- and mid-cap exchange-traded funds
Benefit Plans
Fair value of plan assets	839,000
Fair Value, Inputs, Level 1 [Member] | Equity - mid-cap exchange-traded funds
Benefit Plans
Fair value of plan assets	901,000
Fair Value, Inputs, Level 1 [Member] | Equity - large- and mid-cap exchange-traded funds
Benefit Plans
Fair value of plan assets		844,000
Fair Value, Inputs, Level 1 [Member] | Equity - small-cap exchange-traded funds
Benefit Plans
Fair value of plan assets		394,000
Fair Value, Inputs, Level 1 [Member] | Equity - international funds
Benefit Plans
Fair value of plan assets	1,415,000	1,622,000
Fair Value, Inputs, Level 2 [Member]
Benefit Plans
Fair value of plan assets	60,016,000	65,178,000
Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member]
Benefit Plans
Fair value of plan assets	10,398,000	11,354,000
Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member]
Benefit Plans
Fair value of plan assets	5,089,000	5,899,000
Fair Value, Inputs, Level 2 [Member] | Debt Security, Corporate, US [Member]
Benefit Plans
Fair value of plan assets	44,184,000	47,546,000
Fair Value, Inputs, Level 2 [Member] | Municipal Bonds [Member]
Benefit Plans
Fair value of plan assets	345,000	379,000
Fair Value, Inputs, Level 3 [Member]
Benefit Plans
Fair value of plan assets	$ 0	$ 0

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- Definition

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No definition available.

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- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

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-Topic 715
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Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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