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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Comprehensive Income [Abstract]      
Net income $ 41,791 $ 38,918 $ 37,489
Change in fair value of investment securities available for sale, net of tax of $826, $(2,316) and $(306), respectively 1,530 (4,311) (559)
Reclassification adjustment of net gain from sale of investment securities available for sale included in income, net of tax of $(2), $(461) and $(574), respectively (4) (854) (1,067)
Accretion of other-than-temporary impairment on investment securities, net of tax of $0, $0 and $4, respectively 0 0 108
Reclassification of remaining unaccreted other-than-temporary impairment upon sale of investment securities held to maturity included in income, net of tax of $0, $0 and $44, respectively 0 0 81
Transfer of investment securities from held to maturity to available for sale, net of tax of $0, $0 and $334, respectively 0 0 618
Other comprehensive income (loss) 1,526 (5,165) (819)
Comprehensive income $ 43,317 $ 33,753 $ 36,670