Consolidated Statements of Income (unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Accumulated other comprehensive income reclassification for change in fair value of interest rate swap agreements	$ 62	$ 65	$ 131	$ 86
Accumulated other comprehensive income reclassifications for net realized gains on available-for-sale securities	0	2,190	0	2,190
Income tax expense from reclassification	$ (14)	$ 446	$ (28)	$ 442