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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, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Effective Income Tax Rate Reconciliation, Amount |  |  |  |  |  |  |  |  |  |  |
Income before provision for income tax expense |  |  |  |  |  |  |  |  | $ 17,476 | $ 19,937 | $ 12,382
Tax at statutory federal income tax rate |  |  |  |  |  |  |  |  | 3,670 | 4,187 | 2,600
Tax Cuts and Jobs Act |  |  |  |  |  |  |  |  |  |  | (343)
State restructuring |  |  |  |  |  |  |  |  |  |  | (143)
Tax-exempt income, net |  |  |  |  |  |  |  |  | (487) | (408) | (432)
Other, net |  |  |  |  |  |  |  |  |  | 44 | (14)
Income Tax Expense (Benefit), Total | $ 1,123 | $ 1,153 | $ 750 | $ 157 | $ 941 | $ 954 | $ 837 | $ 1,091 | $ 3,183 | $ 3,823 | $ 1,668
Effective Income Tax Rate Reconciliation, Percent |  |  |  |  |  |  |  |  |  |  |
Income tax rate without impact of Tax Cuts and Jobs Act (as a percent) |  |  |  |  |  |  |  |  | 21.00% | 21.00% | 21.00%
Tax Cuts and Jobs Act (as a percent) |  |  |  |  |  |  |  |  |  |  | (2.77%)
State restructuring (as a percent) |  |  |  |  |  |  |  |  |  |  | (1.16%)
Tax-exempt income, net (as a percent) |  |  |  |  |  |  |  |  | (2.79%) | (2.04%) | (3.49%)
Other, net (as a percent) |  |  |  |  |  |  |  |  |  | 0.22% | (0.11%)
Provision for income tax expense (as a percent) |  |  |  |  |  |  |  |  | 18.21% | 19.18% | 13.47%

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