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Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Amount |  |  |  |  |  |  |  |  |  |  |
Income before provision for income tax expense |  |  |  |  |  |  |  |  | $ 19,937 | $ 12,382 | $ 11,316
Tax at statutory federal income tax rate |  |  |  |  |  |  |  |  | 4,187 | 2,600 | 3,847
Tax Cuts and Jobs Act |  |  |  |  |  |  |  |  | 0 | (343) | 3,139
State restructuring |  |  |  |  |  |  |  |  | 0 | (143) | 966
Tax-exempt income, net |  |  |  |  |  |  |  |  | (408) | (432) | (394)
State income tax, net of federal tax benefit |  |  |  |  |  |  |  |  | 0 | 0 | 323
Other, net |  |  |  |  |  |  |  |  | 44 | (14) | 21
Income Tax Expense (Benefit), Total | $ 941 | $ 954 | $ 837 | $ 1,091 | $ 586 | $ 446 | $ 225 | $ 411 | $ 3,823 | $ 1,668 | $ 7,902
Effective Income Tax Rate Reconciliation, Percent |  |  |  |  |  |  |  |  |  |  |
Income tax rate without impact of Tax Cuts and Jobs Act (as a percent) |  |  |  |  |  |  |  |  | 21.00% | 21.00% | 34.00%
Tax Cuts and Jobs Act (as a percent) |  |  |  |  |  |  |  |  | 0.00% | (2.77%) | 27.74%
State restructuring (as a percent) |  |  |  |  |  |  |  |  | 0.00% | (1.16%) | 8.54%
Tax-exempt income, net (as a percent) |  |  |  |  |  |  |  |  | (2.04%) | (3.49%) | (3.48%)
State income tax, net of federal tax benefit (as a percent) |  |  |  |  |  |  |  |  | 0.00% | 0.00% | 2.85%
Other, net (as a percent) |  |  |  |  |  |  |  |  | 0.22% | (0.11%) | 0.18%
Provision for income tax expense (as a percent) |  |  |  |  |  |  |  |  | 19.18% | 13.47% | 69.83%

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