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Pension Plans - Qualified Plan - Allocation of Defined Benefit Pension Plans Assets (Details) - Pension Plan [Member] - Qualified Plan [Member] - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan, Information about Plan Assets [Abstract]
Plan assets	$ 72,486	$ 71,221	$ 66,000
Defined Benefit Plan, Cash [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Plan assets	935	2,457
Mutual Funds [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Plan assets	$ 71,551	$ 68,764

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.

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