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LOANS AND ALLOWANCE FOR LOAN LOSSES - Summary of Payment Status of Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | $ 12,643 | $ 9,343 |
Current | 1,639,220 | 1,350,201 |
Ending balance | 1,651,863 | 1,359,544 | $ 1,307,375
Recorded Investment Greater than 90 Days and Accruing | 0 | 0 |
30 to 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 6,540 | 6,304 |
60 to 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 4,332 | 845 |
90 Days and Greater Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 1,771 | 2,194 |
Commercial and industrial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 1,455 | 1,383 |
Current | 247,303 | 196,125 |
Ending balance | 248,758 | 197,508 | 192,663
Recorded Investment Greater than 90 Days and Accruing | 0 | 0 |
Commercial and industrial | 30 to 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 450 | 1,273 |
Commercial and industrial | 60 to 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 516 | 93 |
Commercial and industrial | 90 Days and Greater Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 489 | 17 |
Construction and development |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 651 | 117 |
Current | 228,656 | 196,657 |
Ending balance | 229,307 | 196,774 | 201,067
Recorded Investment Greater than 90 Days and Accruing | 0 | 0 |
Construction and development | 30 to 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 94 | 117 |
Construction and development | 60 to 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 56 | 0 |
Construction and development | 90 Days and Greater Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 501 | 0 |
Commercial real estate |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 4,986 | 1,524 |
Current | 594,167 | 416,613 |
Ending balance | 599,153 | 418,137 | 393,314
Recorded Investment Greater than 90 Days and Accruing | 0 | 0 |
Commercial real estate | 30 to 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 1,590 | 192 |
Commercial real estate | 60 to 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 3,311 | 265 |
Commercial real estate | 90 Days and Greater Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 85 | 1,067 |
Farmland |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 471 | 145 |
Current | 64,738 | 58,878 |
Ending balance | 65,209 | 59,023 | 54,349
Recorded Investment Greater than 90 Days and Accruing | 0 | 0 |
Farmland | 30 to 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 348 | 139 |
Farmland | 60 to 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 78 | 0 |
Farmland | 90 Days and Greater Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 45 | 6 |
1-4 family residential |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 4,570 | 5,214 |
Current | 387,886 | 369,157 |
Ending balance | 392,456 | 374,371 | 365,889
Recorded Investment Greater than 90 Days and Accruing | 0 | 0 |
1-4 family residential | 30 to 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 3,640 | 3,998 |
1-4 family residential | 60 to 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 324 | 416 |
1-4 family residential | 90 Days and Greater Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 606 | 800 |
Multi-family residential |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 0 | 217 |
Current | 38,523 | 36,357 |
Ending balance | 38,523 | 36,574 | 23,235
Recorded Investment Greater than 90 Days and Accruing | 0 | 0 |
Multi-family residential | 30 to 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 0 | 0 |
Multi-family residential | 60 to 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 0 | 0 |
Multi-family residential | 90 Days and Greater Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 0 | 217 |
Consumer |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 510 | 537 |
Current | 53,437 | 50,730 |
Ending balance | 53,947 | 51,267 | 51,711
Recorded Investment Greater than 90 Days and Accruing | 0 | 0 |
Consumer | 30 to 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 418 | 381 |
Consumer | 60 to 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 47 | 69 |
Consumer | 90 Days and Greater Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 45 | 87 |
Agricultural |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 0 | 206 |
Current | 24,184 | 25,390 |
Ending balance | 24,184 | 25,596 | 24,449
Recorded Investment Greater than 90 Days and Accruing | 0 | 0 |
Agricultural | 30 to 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 0 | 204 |
Agricultural | 60 to 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 0 | 2 |
Agricultural | 90 Days and Greater Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 0 | 0 |
Overdrafts |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 0 | 0 |
Current | 326 | 294 |
Ending balance | 326 | 294 | $ 698
Recorded Investment Greater than 90 Days and Accruing | 0 | 0 |
Overdrafts | 30 to 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 0 | 0 |
Overdrafts | 60 to 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | 0 | 0 |
Overdrafts | 90 Days and Greater Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans | $ 0 | $ 0 |

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