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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Securities gains (losses) $ 73 $ 522 $ (106)
Tax expense (benefit) 17,018 19,118 18,531
Net income 51,493 47,346 46,432
Unrealized Gains (Losses) on AFS Securities [Member] | Reclassification Out of Accumulated Other Comprehensive Income [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Securities gains (losses) 73 522 (106)
Tax expense (benefit) 26 183 (37)
Net income $ 47 $ 339 $ (69)