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Loans and Allowance for Loan and Lease Losses - Summary of Information Pertaining to Impaired Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Financing Receivable Impaired [Line Items] |  |  |
Recorded Investment, With Valuation Allowance | $ 14,593 | $ 19,525 |
Unpaid Principal, With Valuation Allowance | 14,584 | 19,525 |
Related Allowance, With Valuation Allowance | 2,713 | 4,128 |
Recorded Investment, Without Valuation Allowance | 24,720 | 21,528 |
Unpaid Principal, Without Valuation Allowance | 25,327 | 21,845 |
Average Impaired Loans | 40,184 | 27,130 | $ 12,114
Interest Recognized | 731 | 1,098 | 229
Purchased Credit Impaired Loans |  |  |
Financing Receivable Impaired [Line Items] |  |  |
Recorded Investment, With Valuation Allowance |  | 525 |
Unpaid Principal, With Valuation Allowance |  | 525 |
Related Allowance, With Valuation Allowance |  | 355 |
Average Impaired Loans | 262 | 525 | 263
Commercial real estate |  |  |
Financing Receivable Impaired [Line Items] |  |  |
Recorded Investment, With Valuation Allowance | 165 | 517 |
Unpaid Principal, With Valuation Allowance | 165 | 517 |
Related Allowance, With Valuation Allowance | 123 | 100 |
Recorded Investment, Without Valuation Allowance | 848 | 939 |
Unpaid Principal, Without Valuation Allowance | 881 | 1,011 |
Average Impaired Loans | 1,234 | 1,090 | 1,329
Interest Recognized | 33 | 46 |
Construction, land development, land |  |  |
Financing Receivable Impaired [Line Items] |  |  |
Recorded Investment, With Valuation Allowance |  | 277 |
Unpaid Principal, With Valuation Allowance |  | 275 |
Related Allowance, With Valuation Allowance |  | 25 |
Recorded Investment, Without Valuation Allowance | 136 | 85 |
Unpaid Principal, Without Valuation Allowance | 136 | 86 |
Average Impaired Loans | 249 | 181 |
Interest Recognized |  | 4 |
1-4 family residential properties |  |  |
Financing Receivable Impaired [Line Items] |  |  |
Recorded Investment, With Valuation Allowance | 237 | 8 |
Unpaid Principal, With Valuation Allowance | 235 | 14 |
Related Allowance, With Valuation Allowance | 152 | 1 |
Recorded Investment, Without Valuation Allowance | 2,401 | 1,087 |
Unpaid Principal, Without Valuation Allowance | 2,519 | 1,215 |
Average Impaired Loans | 1,867 | 857 | 623
Interest Recognized | 45 | 18 | 42
Farmland |  |  |
Financing Receivable Impaired [Line Items] |  |  |
Recorded Investment, Without Valuation Allowance | 3,800 | 1,333 |
Unpaid Principal, Without Valuation Allowance | 4,071 | 1,364 |
Average Impaired Loans | 2,567 | 667 |
Interest Recognized | 45 | 45 |
Commercial Loans |  |  |
Financing Receivable Impaired [Line Items] |  |  |
Recorded Investment, With Valuation Allowance | 9,194 | 15,022 |
Unpaid Principal, With Valuation Allowance | 9,191 | 15,018 |
Related Allowance, With Valuation Allowance | 1,409 | 2,101 |
Recorded Investment, Without Valuation Allowance | 17,422 | 18,011 |
Unpaid Principal, Without Valuation Allowance | 17,605 | 18,096 |
Average Impaired Loans | 29,825 | 20,474 | 7,552
Interest Recognized | 599 | 980 | 187
Factored receivables |  |  |
Financing Receivable Impaired [Line Items] |  |  |
Recorded Investment, With Valuation Allowance | 4,726 | 3,176 |
Unpaid Principal, With Valuation Allowance | 4,726 | 3,176 |
Related Allowance, With Valuation Allowance | 949 | 1,546 |
Average Impaired Loans | 3,951 | 3,299 | $ 2,347
Consumer |  |  |
Financing Receivable Impaired [Line Items] |  |  |
Recorded Investment, With Valuation Allowance | 271 |  |
Unpaid Principal, With Valuation Allowance | 267 |  |
Related Allowance, With Valuation Allowance | 80 |  |
Recorded Investment, Without Valuation Allowance | 113 | 73 |
Unpaid Principal, Without Valuation Allowance | 115 | 73 |
Average Impaired Loans | 229 | 37 |
Interest Recognized | $ 9 | $ 5 |

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