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Condensed Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Statement of Comprehensive Income [Abstract]        
Net income $ 16,315 $ 11,832 $ 40,661 $ 35,209
Other comprehensive income (loss), net of tax:        
Unrealized gains (losses) on investment securities arising during the period, net of income tax expense (benefit) for three months of $(493) and $(494), and for nine months of $775 and $2,795, respectively (805) (796) 1,265 4,503
Less: Reclassification adjustment for realized gains on sale of securities available for sale included in net income, net of income tax expense for three months of $8 and $33, and for nine months of $8 and $33, respectively (13) (53) (13) (53)
Total other comprehensive income (loss) (818) (849) 1,252 4,450
Total comprehensive income $ 15,497 $ 10,983 $ 41,913 $ 39,659