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Fair Value Disclosures - Carrying Amount and Estimated Fair Value of Financial Instruments (Details) - USD ($) | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Assets: |  |
Securities available for sale | $ 156,209,802 | $ 151,944,567
Restricted investments | 7,808,300 | 6,430,700
Liabilities: |  |
Noninterest-bearing demand deposits | 276,248,990 | 220,520,287
Interest-bearing demand deposits | 278,965,430 | 231,643,508
Time deposits | 453,276,452 | 442,774,094
Level 1 [Member] |  |
Assets: |  |
Cash and cash equivalents | 96,710,000 | 113,027,000
Securities available for sale | 0 | 0
Level 2 [Member] |  |
Assets: |  |
Securities available for sale | 156,210,000 | 151,944,000
Liabilities: |  |
Noninterest-bearing demand deposits | 276,249,000 | 220,520,000
Interest-bearing demand deposits | 278,965,000 | 231,644,000
Money Market and Savings deposits | 491,243,000 | 543,645,000
Time deposits | 453,943,000 | 443,547,000
Securities sold under agreements to repurchase | 15,968,000 | 24,055,000
Federal Home Loan Bank advances and other borrowings | 30,000,000 | 43,600,000
Level 3 [Member] |  |
Assets: |  |
Securities available for sale | 0 | 0
Loans, net | 1,373,919,000 | 1,292,303,000
Carrying Amount [Member] |  |
Assets: |  |
Cash and cash equivalents | 96,710,000 | 113,027,000
Securities available for sale | 156,210,000 | 151,944,000
Restricted investments | 7,808,000 | 6,431,000
Loans, net | 1,367,780,000 | 1,317,398,000
Liabilities: |  |
Noninterest-bearing demand deposits | 276,249,000 | 220,520,000
Interest-bearing demand deposits | 278,965,000 | 231,644,000
Money Market and Savings deposits | 491,243,000 | 543,645,000
Time deposits | 453,276,000 | 442,774,000
Securities sold under agreements to repurchase | 15,968,000 | 24,055,000
Federal Home Loan Bank advances and other borrowings | 30,000,000 | 43,600,000
Estimated Fair Value [Member] |  |
Assets: |  |
Cash and cash equivalents | 96,710,000 | 113,027,000
Securities available for sale | 156,210,000 | 151,944,000
Loans, net | 1,373,919,000 | 1,292,303,000
Liabilities: |  |
Noninterest-bearing demand deposits | 276,249,000 | 250,520,000
Interest-bearing demand deposits | 278,965,000 | 231,644,000
Money Market and Savings deposits | 491,243,000 | 543,645,000
Time deposits | 453,943,000 | 443,547,000
Securities sold under agreements to repurchase | 15,968,000 | 24,055,000
Federal Home Loan Bank advances and other borrowings | $ 30,000,000 | $ 43,600,000

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