CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 45,632	$ 45,903	$ 35,166
OTHER COMPREHENSIVE INCOME
Change in fair value of derivatives used for cash flow hedges	83	(125)	(514)
Reclassification amount for derivative losses realized in income	219	332	402
Change in unrealized gain (loss) on securities available for sale	(1,265)	(2,294)	(3,160)
Reclassification adjustment for net (gain) loss on securities available for sale recognized in earnings	136		(88)
Change in unrealized gain on security available for sale for which a portion of an other-than-temporary impairment has been recognized in earnings	298	(9)	(125)
Total other comprehensive loss before income tax	(529)	(2,096)	(3,485)
Tax effect	258	734	1,219
Total other comprehensive loss, net of tax	(271)	(1,362)	(2,266)
COMPREHENSIVE INCOME	$ 45,361	$ 44,541	$ 32,900