CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Accumulated other comprehensive income reclassification for change in fair value of interest rate swap agreements	$ 127	$ 276	$ 224
Accumulated other comprehensive income reclassifications for net realized gains on available-for-sale securities	651	783	2,190
Accumulated other comprehensive income reclassifications on employee benefits	(113)	(43)	0
Income tax expense	$ 134	$ 116	$ 413