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Loans and Allowance for Loan Losses - Loan Summary (Details) - USD ($) | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | $ 1,585,194,000 |  | $ 1,323,258,000 |  |  |
Less: Allowance for loan losses | (7,156,025) | $ (7,074,000) | (5,860,291) | $ (5,393,000) | $ (5,498,000) | $ (5,105,000)
Loans, net | 1,578,037,643 |  | 1,317,397,909 |  |  |
Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 29,148,000 |  | 32,794,000 |  |  |
Less: Allowance for loan losses | (19,000) |  | (16,000) |  |  |
Loans, net | 29,129,000 |  | 32,778,000 |  |  |
All Other Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 1,556,046,000 |  | 1,290,464,000 |  |  |
Less: Allowance for loan losses | (7,137,000) |  | (5,844,000) |  |  |
Loans, net | 1,548,909,000 |  | 1,284,620,000 |  |  |
Commercial Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 766,086,000 |  | 642,988,000 |  |  |
Less: Allowance for loan losses | (3,245,000) | (3,135,000) | (2,465,000) | (2,543,000) | (2,489,000) | (2,369,000)
Commercial Real Estate [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 17,632,000 |  | 17,903,000 |  |  |
Less: Allowance for loan losses | (19,000) |  | (16,000) |  |  |
Commercial Real Estate [Member] | All Other Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 748,454,000 |  | 625,085,000 |  |  |
Consumer Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 350,422,000 |  | 293,457,000 |  |  |
Less: Allowance for loan losses | (1,598,000) | (1,528,000) | (1,596,000) | (1,415,000) | (1,653,000) | (1,382,000)
Consumer Real Estate [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 5,799,000 |  | 7,450,000 |  |  |
Less: Allowance for loan losses | 0 |  | 0 |  |  |
Consumer Real Estate [Member] | All Other Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 344,623,000 |  | 286,007,000 |  |  |
Construction and Land Development [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 165,906,000 |  | 135,409,000 |  |  |
Less: Allowance for loan losses | (709,000) | (744,000) | (521,000) | (565,000) | (609,000) | (717,000)
Construction and Land Development [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 4,372,000 |  | 5,120,000 |  |  |
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 | 161,534,000 |  | 130,289,000 |  |  |
Commercial and Industrial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 289,784,000 |  | 238,087,000 |  |  |
Less: Allowance for loan losses | (1,362,000) | (1,367,000) | (1,062,000) | (745,000) | (644,000) | (520,000)
Commercial and Industrial [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 762,000 |  | 858,000 |  |  |
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 | 289,022,000 |  | 237,229,000 |  |  |
Consumer and Other [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 12,996,000 |  | 13,317,000 |  |  |
Less: Allowance for loan losses | (242,000) | $ (300,000) | (216,000) | $ (125,000) | $ (103,000) | $ (117,000)
Consumer and Other [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 583,000 |  | 1,463,000 |  |  |
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 | $ 12,413,000 |  | $ 11,854,000 |  |  |

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