Consolidated statements of comprehensive income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 83,814	$ 80,236	$ 52,398
Other comprehensive income (loss), net of tax:
Net change in unrealized gain (loss) in available-for-sale securities, net of taxes of $6,227, $2,025, and $493	17,693	(5,439)	1,162
Reclassification adjustment for loss (gain) on sale of securities included in net income, net of taxes of $24, $9,and $112	67	44	(173)
Net change in unrealized (loss) gain in hedging activities, net of taxes of $322, $366 and $442	(914)	1,039	685
Reclassification adjustment for gain on hedging activities, net of taxes of $170, $45, and $0	(481)	(128)	0
Total other comprehensive income (loss), net of tax	16,365	(4,484)	1,674
Comprehensive income	$ 100,179	$ 75,752	$ 54,072