CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 17,344	$ 15,095	$ 42,311	$ 41,517
Other comprehensive income (loss):
Unrealized holding gains arising during the period before tax	585	1,827	8,467	10,639
Less reclassification adjustment for gains (losses) included in net income before tax	1,802	(3)	1,867	(56)
Unrealized gains (losses) on securities available for sale	(1,217)	1,830	6,600	10,695
Unrealized holding losses arising during the period before tax	445	(1,159)	(7,903)	(4,101)
Less reclassification adjustment for caplet amortization before tax	(149)		(384)	(291)
Unrealized gains (losses) on derivatives	296	(1,159)	(7,519)	(3,810)
Unrealized holding gains (losses) arising during the period before tax on securities held for sale		48		48
Unrealized holding losses arising during the period before tax on derivatives held for sale		(31)		(31)
Less reclassification adjustment for caplet amortization before tax		(80)		(80)
Unrealized gains (losses) on assets held for sale		97		97
Other comprehensive income (loss), before tax	(921)	768	(919)	6,982
Tax expense	(307)	224	(236)	1,852
Other comprehensive income (loss), net of tax	(614)	544	(683)	5,130
Comprehensive income	$ 16,730	$ 15,639	$ 41,628	$ 46,647