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Fair Value Measurements and Disclosures - Summary of Assets Measured on Recurring Basis (Detail) - USD ($) | Sep. 30, 2017 | Dec. 31, 2016
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | $ 202,196,322 | $ 183,729,857
Municipal Bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 18,493,000 | 21,428,000
Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 202,196,000 | 183,730,000
Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 202,196,000 | 183,730,000
Fair Value, Measurements, Recurring [Member] | U.S. Agency Mortgage-Backed [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 75,254,000 | 78,931,000
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 99,873,000 | 74,330,000
Fair Value, Measurements, Recurring [Member] | Municipal Bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 18,493,000 | 21,428,000
Fair Value, Measurements, Recurring [Member] | U.S. Government Agency [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 8,576,000 | 9,041,000
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 202,196,000 | 183,730,000
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | U.S. Agency Mortgage-Backed [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 75,254,000 | 78,931,000
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Collateralized Mortgage Obligations [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 99,873,000 | 74,330,000
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Municipal Bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | 18,493,000 | 21,428,000
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | U.S. Government Agency [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities | $ 8,576,000 | $ 9,041,000

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