Consolidated statements of comprehensive income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 18,688	$ 22,065	$ 38,276	$ 41,819
Other comprehensive income (loss), net of tax:
Net change in unrealized gain (loss) in available-for-sale securities, net of taxes of $2,382, ($749), $5,134 and ($3,319)	6,725	(2,057)	14,503	(9,096)
Reclassification adjustment for (gain) loss on sale of securities included in net income, net of taxes of ($2), $0, $0 and $2	(3)	0	1	7
Net change in unrealized (loss) gain in hedging activities, net of taxes of ($201), $72, ($317) and $518	(564)	198	(895)	1,469
Reclassification adjustment for (gain) loss on hedging activities, net of taxes of ($42), $1, ($75) and $2	(119)	4	(213)	7
Total other comprehensive income (loss), net of tax	6,039	(1,855)	13,396	(7,613)
Comprehensive income	$ 24,727	$ 20,210	$ 51,672	$ 34,206