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Income Taxes - Reconciliation of Federal Income Tax Expense (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |
State and Local Income Tax Expense (Benefit), Continuing Operations | $ 409,000 |  |
Income Tax Examination, Penalties and Interest Expense | $ 79,500 | $ 3,500 | $ 1,500
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract] |  |  |
Statutory federal corporate income tax rate | 21.00% | 35.00% | 35.00%
Changes in rates resulting from: |  |  |
Tax exempt interest income, net of disallowed interest | (1.80%) | (2.80%) | (1.30%)
Bank owned life insurance | (1.10%) | (1.40%) | (1.20%)
Investments in qualified affordable housing projects, net of tax benefits | (1.30%) | (1.90%) | (1.70%)
KSOP dividend deduction | (0.60%) | (1.00%) | (1.00%)
Impact of the Tax Cuts and Jobs Act (1) | 0.00% | 1.00% | 0.00%
Non-taxable gain on NewDominion common stock | (0.60%) | 0.00% | 0.00%
Other | 0.10% | (0.00%) | 0.10%
Effective tax rate | 15.90% | 28.90% | 29.90%
Deferred Tax Liabilities, Deferred Expense |  | $ 1,900,000 |

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