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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Statement Of Income And Comprehensive Income [Abstract] |  |  |  |
Net income | $ 17,896 | $ 17,940 | $ 58,792 | $ 47,389
Other comprehensive income: |  |  |  |
Unrealized gain (loss) on securities, net of tax | (1,713) | 1,308 | 4,009 | 550
Comprehensive income | $ 16,183 | $ 19,248 | $ 62,801 | $ 47,939

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