Consolidated statements of comprehensive income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 23,966	$ 21,377	$ 62,242	$ 63,196
Other comprehensive income (loss), net of tax:
Net change in unrealized gain (loss) in available-for-sale securities, net of taxes of $1,296, ($1,348), $6,430 and ($4,667)	3,762	(3,749)	18,265	(12,845)
Reclassification adjustment for (gain) loss on sale of securities included in net income, net of taxes of $20, $0, $20 and $2	55	0	56	7
Net change in unrealized (loss) gain in hedging activities, net of taxes of ($90), $59, ($407) and $577	(256)	169	(1,151)	1,638
Reclassification adjustment for (gain) loss on hedging activities, net of taxes of ($46), $23, ($121) and $22	(130)	(69)	(343)	(62)
Total other comprehensive income (loss), net of tax	3,431	(3,649)	16,827	(11,262)
Comprehensive income	$ 27,397	$ 17,728	$ 79,069	$ 51,934