Employee Benefit Plans (Details) - Narrative $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) years period shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($) shares
Employee Benefit [Line Items]
Number of Look-back Period Under Employee Stock Purchase Plan | period	2
Look-back Period Under Employee Stock Purchase Plan	6 months
Discount On Common Stock Under Employee Stock Purchase Plan, Percent	10.00%
Stock Issued During Period, Shares, Employee Stock Purchase Plans | shares	63,586	79,297	57,201
Stock Issued During Period, Value, Employee Stock Purchase Plan	$ 2,300	$ 2,200	$ 2,100
Shares Available For Purchase Under Employee Stock Purchase Plan | shares	160,273
Pension Plan
Employee Benefit [Line Items]
Deferred Compensation Arrangement with Individual, Contributions by Employer	$ 4,000	3,800	3,500
Pension Plan | Minimum
Employee Benefit [Line Items]
Deferred Compensation Arrangement with Individual, Eligible Age | years	18
Pension Plan | Maximum
Employee Benefit [Line Items]
Deferred Compensation Arrangement with Individual, Contribution Requirements, Percent Of Each Employee Compensation	3.00%
Deferred Profit Sharing
Employee Benefit [Line Items]
Deferred Compensation Arrangement with Individual, Contribution To Plan By Employee, Percent Of Eligible Compensation	75.00%
Deferred Compensation Arrangement with Individual, Contribution Requirements, Matching Percent	50.00%
Deferred Compensation Arrangement with Individual, Contributions by Employer	$ 7,700	8,100	7,300
Deferred Profit Sharing | Minimum
Employee Benefit [Line Items]
Deferred Compensation Arrangement with Individual, Eligible Age | years	18
Deferred Profit Sharing | Maximum
Employee Benefit [Line Items]
Deferred Compensation Arrangement with Individual, Contribution Requirements, Percent Of Each Employee Compensation	3.00%
ESP Plan
Employee Benefit [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date	90.00%
Unit Plans
Employee Benefit [Line Items]
Deferred Compensation Arrangement with Individual, Vesting Period	10 years
Deferred Compensation Arrangement with Individual, Benefit Period	10 years
Deferred Compensation Arrangement with Individual, Recorded Liability	$ 3,800	4,000
Deferred Compensation Arrangement with Individual, Compensation Expense	$ 363	$ 488	$ 415
SERP
Employee Benefit [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	2.84%	2.51%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Normal Retirement Age | years	65
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Annual Cost Of Living Benefit Adjustment	2.00%