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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Income Taxes |  |  |  |  |
Federal corporate income tax rate (as a percent) | 19.80% | 12.60% | 19.30% | 11.80% |
Pre-tax gain on sale of branch |  |  | $ 2.2 |  |
Income tax rate without impact of Tax Cuts and Jobs Act (as a percent) |  |  | 18.80% |  | 17.00%

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