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Loans and Allowance for Loan Losses - Loan Summary (Details) - USD ($) | Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | $ 1,374,257,000 | $ 1,323,258,000 |
Less: Allowance for loan losses | (6,477,000) | (5,860,000) | $ (5,105,000)
Loans, net | 1,367,779,622 | 1,317,397,909 |
Purchased Credit Impaired Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 29,836,000 | 32,794,000 |
Less: Allowance for loan losses | 0 | (16,000) |
Loans, net | 29,836,000 | 32,778,000 |
All Other Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 1,344,421,000 | 1,290,464,000 |
Less: Allowance for loan losses | (6,477,000) | (5,844,000) |
Loans, net | 1,337,944,000 | 1,284,620,000 |
Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 663,694,000 | 642,988,000 |
Less: Allowance for loan losses | (2,925,000) | (2,465,000) | (2,369,000)
Commercial Real Estate [Member] | Purchased Credit Impaired Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 16,236,000 | 17,903,000 |
Less: Allowance for loan losses |  | (16,000) |
Commercial Real Estate [Member] | All Other Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 647,458,000 | 625,085,000 |
Consumer Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 299,147,000 | 293,457,000 |
Less: Allowance for loan losses | (1,519,000) | (1,596,000) | (1,382,000)
Consumer Real Estate [Member] | Purchased Credit Impaired Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 6,985,000 | 7,450,000 |
Less: Allowance for loan losses |  | 0 |
Consumer Real Estate [Member] | All Other Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 292,162,000 | 286,007,000 |
Construction and Land Development [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 142,704,000 | 135,409,000 |
Less: Allowance for loan losses | (627,000) | (521,000) | (717,000)
Construction and Land Development [Member] | Purchased Credit Impaired Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 5,003,000 | 5,120,000 |
Less: Allowance for loan losses |  | 0 |
Construction and Land Development [Member] | All Other Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 137,701,000 | 130,289,000 |
Commercial and Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 256,333,000 | 238,087,000 |
Less: Allowance for loan losses | (1,210,000) | (1,062,000) | (520,000)
Commercial and Industrial [Member] | Purchased Credit Impaired Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 649,000 | 858,000 |
Less: Allowance for loan losses |  | 0 |
Commercial and Industrial [Member] | All Other Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 255,684,000 | 237,229,000 |
Consumer and Other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 12,379,000 | 13,317,000 |
Less: Allowance for loan losses | (196,000) | (216,000) | $ (117,000)
Consumer and Other [Member] | Purchased Credit Impaired Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 963,000 | 1,463,000 |
Less: Allowance for loan losses |  | 0 |
Consumer and Other [Member] | All Other Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | $ 11,416,000 | $ 11,854,000 |

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