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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 9,170	$ 9,782	$ 33,623	$ 29,915
Unrealized gains (losses) on securities:
Unrealized holding gains (losses) arising during the period	(605)	124	(2,494)	815
Reclassification of amount realized through sale of securities		(35)	272	(35)
Tax effect	137	(33)	501	(290)
Total other comprehensive income (loss)	(468)	56	(1,721)	490
Comprehensive income	$ 8,702	$ 9,838	$ 31,902	$ 30,405

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