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Consolidated Statements of Income and Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement [Abstract]      
Reclassifications for unrealized net gains on available-for-sale securities $ 6,390 $ 4,520 $ 4,513
Reclassification adjustment for employee benefit costs 5,408 5,486 7,468
Income tax effect $ (344) $ 338 $ 1,034