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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 6,611	$ 5,697	$ 20,640	$ 13,693
Other comprehensive income (loss):
Unrealized gains (losses) on securities available for sale, Change in unrealized gains (losses)	(80)	45	220	710
Unrealized gains (losses) on securities available for sale, Reclassification of gains recognized in net income				(19)
Unrealized gains (losses) on securities available for sale	(80)	45	220	691
Related income tax effect, Change in unrealized gains (losses)	33	(18)	(90)	(291)
Related income tax effect, Reclassification of gains recognized in net income				8
Related income tax effect	33	(18)	(90)	(283)
Total other comprehensive income	(47)	27	130	408
Total comprehensive income	$ 6,564	$ 5,724	$ 20,770	$ 14,101

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