Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 52,580	$ 41,518	$ 32,481
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX:
Unrealized losses on securities available for sale	(903)	(1,038)	(220)
Reclassification for securities gains included in net income	(1,640)	(233)	(157)
Unrealized gains on derivatives	37	672	0
Change in pension liability, net	(16)	42	4
Other comprehensive loss	(2,522)	(557)	(373)
TOTAL COMPREHENSIVE INCOME	$ 50,058	$ 40,961	$ 32,108