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Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) shares | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) Segment shares | Sep. 30, 2018 USD ($) | Jan. 01, 2019 USD ($) | Dec. 31, 2018 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Federal Deposit Insurance Corporation protection limits | $ 250,000 |  | $ 250,000 |  |  |
Un-amortized franchise fees | 428,223 |  | 428,223 |  |  | $ 471,996
Amortization expense | 14,869 | $ 14,868 | 43,773 | $ 45,204 |  |
Non recurring asset | 3,940,000 |  | 3,940,000 |  |  |
Deferred income taxes | 4,679,010 |  | 4,679,010 |  |  | 5,131,179
Deferred tax assets related to net operating losses | 4,100,000 |  | $ 4,100,000 |  |  | 4,400,000
Minimum percentage of likelihood of realization of deferred tax assets |  |  | 50.00% |  |  |
Deferred tax assets valuation allowance | 0 |  | $ 0 |  |  |
Uncertain tax positions | 0 |  | 0 |  |  | $ 0
Compensation cost recognized |  |  | 309,920 | 313,540 |  |
Advertising cost | 132,227 | 88,154 | 319,947 | 334,271 |  |
Gain on involuntary conversion of assets | 130,569 | 0 | $ 291,902 | 898,565 |  |
Number of reportable segment | Segment |  |  | 1 |  |  |
ESOP [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Compensation cost recognized | 60,259 | 64,294 | $ 193,513 | 186,137 |  |
Director [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Shares issued but not vested | shares |  |  | 13,000 |  |  |
Shares award vesting date |  |  | Dec. 31, 2019 |  |  |
2013 Plan [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Shares issued under plan | shares |  |  | 176,350 |  |  |
Performance-based stock awards granted | shares |  |  | 0 |  |  |
Compensation cost recognized | 8,025 | 8,025 | $ 116,408 | 127,402 |  |
2013 Plan [Member] | Director [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Shares issued under plan | shares |  |  | 33,000 |  |  |
2013 Plan [Member] | Executives and Employees [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Shares issued under plan | shares |  |  | 143,350 |  |  |
2013 Plan [Member] | One Employee [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Stock award vesting period |  |  | 4 years |  |  |
Shares issued but not vested | shares |  |  | 20,000 |  |  |
Other Operating Departments [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Lease revenue | 400,000 | $ 300,000 | $ 1,200,000 | $ 1,200,000 |  |
ASU 2016-02 [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Operating Lease, right of use assets, net | 6,600,000 |  | 6,600,000 |  |  |
Operating lease obligations | $ 4,400,000 |  | $ 4,400,000 |  |  |
ASU 2018-11 [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Operating Lease, right of use assets, net |  |  |  |  | $ 6,300,000 |
Operating lease obligations |  |  |  |  | $ 3,800,000 |
Maximum [Member] | 2013 Plan [Member] | Employees [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Restricted, unrestricted and performance stock awards permitted to grant to employees and directors | shares | 350,000 |  | 350,000 |  |  |
Maximum [Member] | 2013 Plan [Member] | Director [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Restricted, unrestricted and performance stock awards permitted to grant to employees and directors | shares | 750,000 |  | 750,000 |  |  |
Buildings and Building Improvements [Member] | Minimum [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Estimated useful lives of the assets |  |  | 7 years |  |  |
Buildings and Building Improvements [Member] | Maximum [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Estimated useful lives of the assets |  |  | 39 years |  |  |
Furniture, Fixtures and Equipment [Member] | Minimum [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Estimated useful lives of the assets |  |  | 5 years |  |  |
Furniture, Fixtures and Equipment [Member] | Maximum [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Estimated useful lives of the assets |  |  | 10 years |  |  |

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