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Stock-Based Compensation Plans (Schedule of Compensation Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Restricted Stock Units (RSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Compensation expense(1)	$ 610	$ 475	$ 389
Income tax benefit	131	102	84
Fair value of grants vested	506	407	302
Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Compensation expense(1)	895	781	751
Income tax benefit	192	168	161
Fair value of grants vested	901	772	780
Management Stock Purchase Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Compensation expense(1)	104	71	95
Income tax benefit	22	15	20
Fair value of grants vested	70	110	75
Performance Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Compensation expense(1)	637	332	532
Income tax benefit	137	71	114
Fair value of grants vested	435	0	344
Deferred Stock Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Compensation expense(1)	135	122	110
Income tax benefit	29	26	24
Fair value of grants vested	$ 118	$ 129	$ 102

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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-Topic 718
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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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