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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)

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