CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 18,216	$ 14,817	$ 49,264	$ 37,199
Other comprehensive income (loss):
Change in fair value of cash flow hedges	(2,328)	(228)	(2,009)	(431)
Reclassification adjustment for losses included in net income (net of tax, $84 and $89 for the three months and $253 and $231 for the nine months ended September 30, 2015 and 2014)	157	164	470	428
Unrealized gains (losses) on available-for-sale (AFS) securities:
Unrealized holding gains (losses) arising during period (net of tax, $673 and $968 for the three months and $976 and $7,992 for the nine months ended September 30, 2015 and 2014)	1,250	1,798	(1,812)	14,843
Reclassification adjustment for (gains) losses included in net income (net of tax, $79 and $348 for the three months and $130 and $367 for the nine months ended September 30, 2015 and 2014)	146	(647)	(242)	(682)
Unrealized gains (losses) on held-to-maturity (HTM) securities:
Accretion of unrealized gain for AFS securities transferred to HTM (net of tax, $166 and $0 for the three months and $278 and $0 for the nine months ended September 30, 2015 and 2014).	(308)		(516)
Other comprehensive income (loss)	(1,083)	1,087	(4,109)	14,158
Comprehensive income	$ 17,133	$ 15,904	$ 45,155	$ 51,357