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LOANS AND ALLOWANCE FOR LOAN LOSSES (Summary of Aging of the Loan Portfolio by Segment) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Greater Than 90 Days and Still Accruing | $ 13,396 | $ 8,856 |
Total Loans | 12,610,936 | 9,716,207 |
Nonaccrual | 28,232 | 26,953 | $ 21,700
Current | 12,419,378 | 9,537,156 |
30 to 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 50,453 | 41,434 |
60 to 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 12,796 | 11,587 |
Purchased Impaired |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Loans | 86,681 | 90,221 |
Current | 70,267 | 71,213 |
Construction and Land Development |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Greater Than 90 Days and Still Accruing | 189 | 180 |
Total Loans | 1,250,924 | 1,194,821 |
Nonaccrual | 3,703 | 8,018 |
Current | 1,231,043 | 1,177,204 |
Construction and Land Development | 30 to 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 4,563 | 759 |
Construction and Land Development | 60 to 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 482 | 6 |
Construction and Land Development | Purchased Impaired |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Loans | 10,944 | 8,654 |
Current | 10,465 | 7,122 |
Commercial Real Estate - Owner Occupied |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Greater Than 90 Days and Still Accruing | 1,062 | 3,193 |
Total Loans | 2,041,243 | 1,337,345 |
Nonaccrual | 6,003 | 3,636 |
Current | 2,001,074 | 1,294,975 |
Commercial Real Estate - Owner Occupied | 30 to 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 3,482 | 8,755 |
Commercial Real Estate - Owner Occupied | 60 to 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 2,184 | 1,142 |
Commercial Real Estate - Owner Occupied | Purchased Impaired |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Loans | 27,438 | 25,644 |
Current | 20,074 | 20,705 |
Commercial Real Estate - Non-Owner Occupied |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Greater Than 90 Days and Still Accruing | 1,451 | 0 |
Total Loans | 3,286,098 | 2,467,410 |
Nonaccrual | 381 | 1,789 |
Current | 3,269,244 | 2,447,907 |
Commercial Real Estate - Non-Owner Occupied | 30 to 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 457 | 338 |
Commercial Real Estate - Non-Owner Occupied | 60 to 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 0 | 41 |
Commercial Real Estate - Non-Owner Occupied | Purchased Impaired |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Loans | 14,565 | 17,335 |
Current | 12,730 | 15,464 |
Multifamily Real Estate |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Greater Than 90 Days and Still Accruing | 474 | 0 |
Total Loans | 633,743 | 548,231 |
Nonaccrual | 0 | 0 |
Current | 632,952 | 547,997 |
Multifamily Real Estate | 30 to 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 223 | 0 |
Multifamily Real Estate | 60 to 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 0 | 146 |
Multifamily Real Estate | Purchased Impaired |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Loans | 94 | 88 |
Current | 94 | 88 |
Commercial and Industrial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Greater Than 90 Days and Still Accruing | 449 | 132 |
Total Loans | 2,114,033 | 1,317,135 |
Nonaccrual | 1,735 | 1,524 |
Current | 2,099,974 | 1,309,581 |
Commercial and Industrial | 30 to 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 8,698 | 3,353 |
Commercial and Industrial | 60 to 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 1,598 | 389 |
Commercial and Industrial | Purchased Impaired |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Loans | 1,579 | 2,156 |
Current | 590 | 1,017 |
Residential 1-4 Family - Commercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Greater Than 90 Days and Still Accruing | 674 | 1,409 |
Total Loans | 724,337 | 640,419 |
Nonaccrual | 4,301 | 2,481 |
Current | 703,471 | 614,732 |
Residential 1-4 Family - Commercial | 30 to 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 1,479 | 6,619 |
Residential 1-4 Family - Commercial | 60 to 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 2,207 | 1,577 |
Residential 1-4 Family - Commercial | Purchased Impaired |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Loans | 12,205 | 13,601 |
Current | 9,667 | 9,276 |
Residential 1-4 Family - Consumer |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Greater Than 90 Days and Still Accruing | 4,515 | 2,437 |
Total Loans | 890,503 | 673,909 |
Nonaccrual | 9,292 | 7,276 |
Current | 842,667 | 630,132 |
Residential 1-4 Family - Consumer | 30 to 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 16,244 | 12,049 |
Residential 1-4 Family - Consumer | 60 to 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 3,072 | 5,143 |
Residential 1-4 Family - Consumer | Purchased Impaired |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Loans | 14,713 | 16,872 |
Current | 12,005 | 12,491 |
Residential 1-4 Family - Revolving |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Greater Than 90 Days and Still Accruing | 3,357 | 440 |
Total Loans | 659,504 | 613,383 |
Nonaccrual | 2,080 | 1,518 |
Current | 637,966 | 600,055 |
Residential 1-4 Family - Revolving | 30 to 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 10,190 | 4,611 |
Residential 1-4 Family - Revolving | 60 to 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 1,784 | 1,644 |
Residential 1-4 Family - Revolving | Purchased Impaired |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Loans | 4,127 | 5,115 |
Current | 3,635 | 4,365 |
Auto |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Greater Than 90 Days and Still Accruing | 272 | 195 |
Total Loans | 350,419 | 301,943 |
Nonaccrual | 563 | 576 |
Current | 346,819 | 297,442 |
Auto | 30 to 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 2,525 | 3,320 |
Auto | 60 to 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 236 | 403 |
Auto | Purchased Impaired |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Loans | 4 | 7 |
Current | 4 | 7 |
Consumer |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Greater Than 90 Days and Still Accruing | 953 | 870 |
Total Loans | 372,853 | 379,694 |
Nonaccrual | 77 | 135 |
Current | 367,794 | 376,057 |
Consumer | 30 to 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 2,128 | 1,504 |
Consumer | 60 to 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 1,233 | 1,096 |
Consumer | Purchased Impaired |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Loans | 668 | 32 |
Current | 659 | 18 |
Other Commercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Greater Than 90 Days and Still Accruing | 0 | 0 |
Total Loans | 287,279 | 241,917 |
Nonaccrual | 97 | 0 |
Current | 286,374 | 241,074 |
Other Commercial | 30 to 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 464 | 126 |
Other Commercial | 60 to 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 0 | 0 |
Other Commercial | Purchased Impaired |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Loans | 344 | 717 |
Current | $ 344 | $ 660 |

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