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Income Tax - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Taxes [Line Items] |  |  |  |
U.S. federal corporate tax rate |  | 21.00% | 35.00% | 35.00%
Previously acquired institutions amount of allocated income to bad debt deductions |  | $ 12,800,000 |  |
Unrecorded deferred income tax liability |  | $ 2,700,000 |  |
Bad debt reserve, description |  | Retained earnings of the Bank include approximately $12.8 million for which no deferred income tax liability has been recognized. This amount represents an allocation of previously acquired institutions income to bad debt deductions as of December 31, 1987 for tax purposes only. Reductions of amounts so allocated for purposes other than tax bad debt losses including redemption of bank stock or excess dividends, or loss of “bank” status would create income for tax purposes only, which would be subject to the then-current corporate income tax rate. |  |
Scenario, Forecast [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
U.S. federal corporate tax rate | 21.00% |  |  |
State Tax Jurisdiction [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Operating loss carry forwards |  | $ 13,900,000 |  |
Tax Credit Carryforward, Amount |  | $ 157,000 |  |
Minimum [Member] | Federal Jurisdiction [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Operating loss carry forward expiration year |  | 2031 |  |

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