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Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Securities gains | $ 48 | $ 458 | $ 58 | $ 522
Tax expense | 5,811 | 5,223 | 15,010 | 14,106
Net income | 13,763 | 12,312 | 36,581 | 35,480
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 | 48 | 458 | 58 | 522
Tax expense | 17 | 160 | 20 | 183
Net income | $ 31 | $ 298 | $ 38 | $ 339

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