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Fair Value Measurements and Disclosures - Summary of Estimated Fair Values of Company's Financial Instruments (Detail) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Financial Assets    
Investment securities available for sale $ 202,196,322 $ 183,729,857
Investment securities held to maturity 13,246,498 13,362,062
Financial Liabilities    
Short-term FHLB advances   40,000,000
Carrying Amount [Member]    
Financial Assets    
Cash and cash equivalents 51,626,000 29,315,000
Interest-bearing deposits in banks 1,191,000 1,884,000
Investment securities available for sale 202,196,000 183,730,000
Investment securities held to maturity 13,118,000 13,365,000
Mortgage loans held for sale 5,617,000 4,156,000
Loans, net 1,213,969,000 1,215,323,000
Cash surrender value of BOLI 20,510,000 20,150,000
Financial Liabilities    
Deposits 1,319,713,000 1,248,072,000
Short-term FHLB advances   40,000,000
Long-term FHLB advances 64,804,000 78,533,000
Fair Value [Member]    
Financial Assets    
Cash and cash equivalents 51,626,000 29,315,000
Interest-bearing deposits in banks 1,191,000 1,884,000
Investment securities available for sale 202,196,000 183,730,000
Investment securities held to maturity 13,246,000 13,362,000
Mortgage loans held for sale 5,617,000 4,156,000
Loans, net 1,214,156,000 1,205,538,000
Cash surrender value of BOLI 20,510,000 20,150,000
Financial Liabilities    
Deposits 1,319,692,000 1,247,526,000
Short-term FHLB advances   40,000,000
Long-term FHLB advances 64,498,000 78,039,000
Level 1 [Member]    
Financial Assets    
Cash and cash equivalents 51,626,000 29,315,000
Interest-bearing deposits in banks 1,191,000 1,884,000
Cash surrender value of BOLI 20,510,000 20,150,000
Financial Liabilities    
Short-term FHLB advances   40,000,000
Level 2 [Member]    
Financial Assets    
Investment securities available for sale 202,196,000 183,730,000
Investment securities held to maturity 13,246,000 13,362,000
Mortgage loans held for sale 5,617,000 4,156,000
Loans, net 1,209,474,000 1,200,775,000
Financial Liabilities    
Deposits 1,319,692,000 1,247,526,000
Long-term FHLB advances 64,498,000 78,039,000
Level 3 [Member]    
Financial Assets    
Loans, net $ 4,682,000 $ 4,763,000