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Loans and Allowance for Loan Losses - Loan Summary (Details) - USD ($) | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | $ 1,840,569,000 | $ 1,777,239,000 |  |
Less: Allowance for loan losses | (8,704,413) | (8,275,055) | $ (6,477,000) | $ (5,860,000)
Loans, net | 1,831,864,834 | 1,768,963,569 |  |
Purchased Credit Impaired Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | 32,868,000 | 34,158,000 |  |
Less: Allowance for loan losses | (54,000) | 0 |  |
Loans, net | 32,814,000 | 34,158,000 |  |
All Other Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | 1,807,701,000 | 1,743,081,000 |  |
Less: Allowance for loan losses | (8,650,000) | (8,275,000) |  |
Loans, net | 1,799,051,000 | 1,734,806,000 |  |
Commercial Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | 888,942,000 | 860,027,000 |  |
Less: Allowance for loan losses | (4,074,000) | (3,639,000) | (2,925,000) | (2,465,000)
Commercial Real Estate [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | 17,299,000 | 17,682,000 |  |
Less: Allowance for loan losses | (40,000) | 0 |  |
Commercial Real Estate [Member] | All Other Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | 871,643,000 | 842,345,000 |  |
Consumer Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | 410,981,000 | 407,254,000 |  |
Less: Allowance for loan losses | (1,949,000) | (1,789,000) | (1,519,000) | (1,596,000)
Consumer Real Estate [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | 8,146,000 | 8,712,000 |  |
Less: Allowance for loan losses | (14,000) | 0 |  |
Consumer Real Estate [Member] | All Other Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | 402,835,000 | 398,542,000 |  |
Construction and Land Development [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | 187,009,000 | 187,895,000 |  |
Less: Allowance for loan losses | (854,000) | (795,000) | (627,000) | (521,000)
Construction and Land Development [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | 4,670,000 | 4,602,000 |  |
Less: Allowance for loan losses | 0 | 0 |  |
Construction and Land Development [Member] | All Other Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | 182,339,000 | 183,293,000 |  |
Commercial and Industrial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | 341,471,000 | 308,254,000 |  |
Less: Allowance for loan losses | (1,709,000) | (1,746,000) | (1,210,000) | (1,062,000)
Commercial and Industrial [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | 2,300,000 | 2,557,000 |  |
Less: Allowance for loan losses | 0 | 0 |  |
Commercial and Industrial [Member] | All Other Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | 339,171,000 | 305,697,000 |  |
Consumer and Other [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | 12,166,000 | 13,809,000 |  |
Less: Allowance for loan losses | (118,000) | (306,000) | $ (196,000) | $ (216,000)
Consumer and Other [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | 453,000 | 605,000 |  |
Less: Allowance for loan losses | 0 | 0 |  |
Consumer and Other [Member] | All Other Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | $ 11,713,000 | $ 13,204,000 |  |

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