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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

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