Consolidated Statements of Income (unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Accumulated other comprehensive income reclassification for change in fair value of interest rate swap agreements	$ 73	$ 68	$ 204	$ 154
Accumulated other comprehensive income reclassifications for net realized gains on available-for-sale securities	0	0	0	2,190
Income tax expense from reclassification	$ (15)	$ (14)	$ (43)	$ 428