Consolidated Statements of Income and Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Accumulated other comprehensive income reclassification for change in fair value of interest rate swap agreements	$ 276	$ 224	$ 63
Accumulated other comprehensive income reclassifications for net realized gains on available-for-sale securities	783	2,190	148
Accumulated other comprehensive income reclassifications on employee benefits	(44)	0	23
Income tax expense from reclassification	$ (116)	$ (413)	$ (13)