Consolidated Statements of Income (unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Accumulated other comprehensive income reclassification for change in fair value of interest rate swap agreements	$ 68	$ 11	$ 154	$ 31
Accumulated other comprehensive income reclassifications for net realized gains on available-for-sale securities	0	0	2,190	148
Income tax expense from reclassification	$ (14)	$ (2)	$ 428	$ 25