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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