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Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Amounts Reclassified from AOCI [Abstract] |  |  |
Securities gains (losses) | $ (85) | $ 73 | $ 522
Tax expense (benefit) | 11,314 | 17,018 | 19,118
Net income | 59,228 | 51,493 | 47,346
Unrealized Gains (Losses) on AFS Securities [Member] | Reclassification Out of Accumulated Other Comprehensive Income [Member] |  |  |
Amounts Reclassified from AOCI [Abstract] |  |  |
Securities gains (losses) | (821) | 73 | 522
Tax expense (benefit) | (172) | 26 | 183
Net income | $ (649) | $ 47 | $ 339

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