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Stock-Based Compensation Plans (Schedule of Compensation Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Compensation expense(1)	$ 962	$ 724	$ 610
Income tax benefit	207	156	131
Fair value of grants vested	803	622	506
Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Compensation expense(1)	1,225	1,053	895
Income tax benefit	263	226	192
Fair value of grants vested	1,187	1,014	901
Management Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Compensation expense(1)	93	124	104
Income tax benefit	20	27	22
Fair value of grants vested	129	87	70
Performance-based share units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Compensation expense(1)	332	457	637
Income tax benefit	71	98	137
Fair value of grants vested	594	548	435
DCRP
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Compensation expense(1)	188	169	135
Income tax benefit	40	36	29
Fair value of grants vested	$ 171	$ 174	$ 118

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

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