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Retirement Agreements and Other Postretirement Benefit Plan Changes in Amounts Related to Accumulated Other Comprehensive Income, Pre-tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of year	$ 82	$ 41
Unrecognized prior service cost	0	0
Amortization of loss, net	0	0
Actuarial loss (gain)	102	41
Balance at end of year	$ 184	$ 82

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- Definition

Accumulated Other Comprehensive Income (Loss) [Roll Forward]

+ References

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Amount, before tax, of actuarial losses (gains) for defined benefit plans

+ References

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Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.

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Amount, before tax, of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.

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