CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 16,639	$ 19,124
Cash flow hedges:
Change in fair value of cash flow hedges	1,964	(31)
Reclassification adjustment for losses (gains) included in net income (net of tax, $66 and $97 for the three months ended March 31, 2018 and 2017, respectively)	249	180
AFS securities:
Unrealized holding gains (losses) arising during period (net of tax, $3,506 and $1,958 for the three months ended March 31, 2018 and 2017, respectively)	(13,191)	3,637
Reclassification adjustment for losses (gains) included in net income (net of tax, $45 and $168 for the three months ended March 31, 2018 and 2017, respectively)	(168)	(313)
HTM securities:
Reclassification adjustment for accretion of unrealized gain on AFS securities transferred to HTM (net of tax, $80 and $99 for the three months ended March 31, 2018 and 2017, respectively)	(299)	(184)
Bank owned life insurance:
Reclassification adjustment for losses included in net income	19	109
Net current period other comprehensive income (loss)	(11,426)	3,398
Comprehensive income	$ 5,213	$ 22,522