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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 51,708	$ 36,220	$ 20,700
Unrealized gains (losses) on securities available for sale:
Unrealized holding gains (losses) arising during the period	(1,059)	(298)	(934)
Reclassification of amount realized through sale of securities	272	(35)	56
Tax effect	180	13	325
Total other comprehensive income (loss)	(607)	(320)	(553)
Comprehensive income	$ 51,101	$ 35,900	$ 20,147

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