CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Statement [Abstract]
Accumulated other comprehensive income reclassification for change in fair value of interest rate swap agreements	$ (151)	$ 127	$ 276
Accumulated other comprehensive income reclassifications for net realized gains on available-for-sale securities	52	651	783
Accumulated other comprehensive income reclassifications on employee benefits	(174)	(113)	(43)
Income tax expense	$ 79	$ 134	$ 116