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Loans and Allowance for Loan Losses - ALL by Loan Classification (Details) - USD ($) | Jun. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | $ 7,073,937 | $ 5,860,291 | $ 5,105,000
All Other Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | 7,055,000 | 5,844,000 |
Purchased Credit Impaired Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | 19,000 | 16,000 |
Performing [Member] | All Other Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | 6,720,000 | 5,399,000 |
Impaired Loans [Member] | All Other Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | 335,000 | 445,000 |
Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | 3,135,000 | 2,465,000 | 2,369,000
Commercial Real Estate [Member] | Purchased Credit Impaired Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | 19,000 | 16,000 |
Commercial Real Estate [Member] | Performing [Member] | All Other Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | 3,116,000 | 2,444,000 |
Commercial Real Estate [Member] | Impaired Loans [Member] | All Other Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | 0 | 5,000 |
Consumer Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | 1,528,000 | 1,596,000 | 1,382,000
Consumer Real Estate [Member] | Purchased Credit Impaired Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | 0 | 0 |
Consumer Real Estate [Member] | Performing [Member] | All Other Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | 1,491,000 | 1,340,000 |
Consumer Real Estate [Member] | Impaired Loans [Member] | All Other Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | 37,000 | 256,000 |
Construction and Land Development [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | 744,000 | 521,000 | 717,000
Construction and Land Development [Member] | Purchased Credit Impaired Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | 0 | 0 |
Construction and Land Development [Member] | Performing [Member] | All Other Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | 744,000 | 521,000 |
Construction and Land Development [Member] | Impaired Loans [Member] | All Other Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | 0 | 0 |
Commercial and Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | 1,367,000 | 1,062,000 | 520,000
Commercial and Industrial [Member] | Purchased Credit Impaired Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | 0 | 0 |
Commercial and Industrial [Member] | Performing [Member] | All Other Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | 1,145,000 | 890,000 |
Commercial and Industrial [Member] | Impaired Loans [Member] | All Other Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | 222,000 | 172,000 |
Consumer and Other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | 300,000 | 216,000 | $ 117,000
Consumer and Other [Member] | Purchased Credit Impaired Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | 0 | 0 |
Consumer and Other [Member] | Performing [Member] | All Other Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | 224,000 | 204,000 |
Consumer and Other [Member] | Impaired Loans [Member] | All Other Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | $ 76,000 | $ 12,000 |

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