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LOANS AND ALLOWANCE FOR LOAN LOSSES (Summary of Aging of the Loan Portfolio by Class) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | $ 13,929,049 |  | $ 12,419,378 |
Greater Than 90 Days and Still Accruing | 13,634 |  | 13,396 |
Nonaccrual | 42,448 | $ 45,204 | 28,232 | $ 27,000
Total Loans | 14,021,314 |  | 12,610,936 |
30-59 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 27,024 |  | 50,453 |
60-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 9,159 |  | 12,796 |
Purchased Impaired |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current |  |  | 70,267 |
Total Loans |  |  | 86,681 |
Purchased Impaired | 30-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due |  |  | 3,221 |
Purchased Impaired | 90+ Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due |  |  | 13,193 |
Construction and Land Development |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 920,276 |  | 1,231,043 |
Greater Than 90 Days and Still Accruing | 0 |  | 189 |
Nonaccrual | 3,072 | 4,060 | 3,703 |
Total Loans | 925,798 |  | 1,250,924 |
Construction and Land Development | 30-59 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 1,903 |  | 4,563 |
Construction and Land Development | 60-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 547 |  | 482 |
Construction and Land Development | Purchased Impaired |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current |  |  | 10,465 |
Total Loans |  |  | 10,944 |
Construction and Land Development | Purchased Impaired | 30-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due |  |  | 136 |
Construction and Land Development | Purchased Impaired | 90+ Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due |  |  | 343 |
Commercial Real Estate - Owner Occupied |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 2,114,804 |  | 2,001,074 |
Greater Than 90 Days and Still Accruing | 3,727 |  | 1,062 |
Nonaccrual | 7,128 | 13,889 | 6,003 |
Total Loans | 2,128,909 |  | 2,041,243 |
Commercial Real Estate - Owner Occupied | 30-59 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 1,870 |  | 3,482 |
Commercial Real Estate - Owner Occupied | 60-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 1,380 |  | 2,184 |
Commercial Real Estate - Owner Occupied | Purchased Impaired |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current |  |  | 20,074 |
Total Loans |  |  | 27,438 |
Commercial Real Estate - Owner Occupied | Purchased Impaired | 30-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due |  |  | 480 |
Commercial Real Estate - Owner Occupied | Purchased Impaired | 90+ Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due |  |  | 6,884 |
Commercial Real Estate - Non-Owner Occupied |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 3,651,232 |  | 3,269,244 |
Greater Than 90 Days and Still Accruing | 148 |  | 1,451 |
Nonaccrual | 2,317 | 1,368 | 381 |
Total Loans | 3,657,562 |  | 3,286,098 |
Commercial Real Estate - Non-Owner Occupied | 30-59 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 2,144 |  | 457 |
Commercial Real Estate - Non-Owner Occupied | 60-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 1,721 |  | 0 |
Commercial Real Estate - Non-Owner Occupied | Purchased Impaired |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current |  |  | 12,730 |
Total Loans |  |  | 14,565 |
Commercial Real Estate - Non-Owner Occupied | Purchased Impaired | 30-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due |  |  | 848 |
Commercial Real Estate - Non-Owner Occupied | Purchased Impaired | 90+ Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due |  |  | 987 |
Multifamily Real Estate |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 814,095 |  | 632,952 |
Greater Than 90 Days and Still Accruing | 0 |  | 474 |
Nonaccrual | 33 | 0 | 0 |
Total Loans | 814,745 |  | 633,743 |
Multifamily Real Estate | 30-59 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 617 |  | 223 |
Multifamily Real Estate | 60-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 0 |  | 0 |
Multifamily Real Estate | Purchased Impaired |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current |  |  | 94 |
Total Loans |  |  | 94 |
Multifamily Real Estate | Purchased Impaired | 30-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due |  |  | 0 |
Multifamily Real Estate | Purchased Impaired | 90+ Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due |  |  | 0 |
Commercial and Industrial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 3,257,201 |  | 2,099,974 |
Greater Than 90 Days and Still Accruing | 1,114 |  | 449 |
Nonaccrual | 2,107 | 3,037 | 1,735 |
Total Loans | 3,263,460 |  | 2,114,033 |
Commercial and Industrial | 30-59 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 1,848 |  | 8,698 |
Commercial and Industrial | 60-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 1,190 |  | 1,598 |
Commercial and Industrial | Purchased Impaired |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current |  |  | 590 |
Total Loans |  |  | 1,579 |
Commercial and Industrial | Purchased Impaired | 30-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due |  |  | 0 |
Commercial and Industrial | Purchased Impaired | 90+ Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due |  |  | 989 |
Residential 1-4 Family - Commercial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 657,351 |  | 703,471 |
Greater Than 90 Days and Still Accruing | 1,560 |  | 674 |
Nonaccrual | 9,993 | 6,492 | 4,301 |
Total Loans | 671,949 |  | 724,337 |
Residential 1-4 Family - Commercial | 30-59 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 2,227 |  | 1,479 |
Residential 1-4 Family - Commercial | 60-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 818 |  | 2,207 |
Residential 1-4 Family - Commercial | Purchased Impaired |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current |  |  | 9,667 |
Total Loans |  |  | 12,205 |
Residential 1-4 Family - Commercial | Purchased Impaired | 30-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due |  |  | 543 |
Residential 1-4 Family - Commercial | Purchased Impaired | 90+ Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due |  |  | 1,995 |
Residential 1-4 Family - Consumer |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 792,852 |  | 842,667 |
Greater Than 90 Days and Still Accruing | 5,699 |  | 4,515 |
Nonaccrual | 12,600 | 13,117 | 9,292 |
Total Loans | 822,866 |  | 890,503 |
Residential 1-4 Family - Consumer | Current |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total Loans | 792,852 |  |  |
Residential 1-4 Family - Consumer | 30-59 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 10,182 |  | 16,244 |
Total Loans | 10,182 |  |  |
Residential 1-4 Family - Consumer | 60-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 1,533 |  | 3,072 |
Total Loans | 1,533 |  |  |
Residential 1-4 Family - Consumer | 90+ Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total Loans | 5,699 |  |  |
Residential 1-4 Family - Consumer | Nonaccrual |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total Loans | 12,600 |  |  |
Residential 1-4 Family - Consumer | Purchased Impaired |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current |  |  | 12,005 |
Total Loans |  |  | 14,713 |
Residential 1-4 Family - Consumer | Purchased Impaired | 30-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due |  |  | 927 |
Residential 1-4 Family - Consumer | Purchased Impaired | 90+ Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due |  |  | 1,781 |
Residential 1-4 Family - Revolving |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 587,522 |  | 637,966 |
Greater Than 90 Days and Still Accruing | 826 |  | 3,357 |
Nonaccrual | 4,629 | 2,490 | 2,080 |
Total Loans | 596,996 |  | 659,504 |
Residential 1-4 Family - Revolving | Current |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total Loans | 587,522 |  |  |
Residential 1-4 Family - Revolving | 30-59 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 2,975 |  | 10,190 |
Total Loans | 2,975 |  |  |
Residential 1-4 Family - Revolving | 60-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 1,044 |  | 1,784 |
Total Loans | 1,044 |  |  |
Residential 1-4 Family - Revolving | 90+ Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total Loans | 826 |  |  |
Residential 1-4 Family - Revolving | Nonaccrual |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total Loans | 4,629 |  |  |
Residential 1-4 Family - Revolving | Purchased Impaired |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current |  |  | 3,635 |
Total Loans |  |  | 4,127 |
Residential 1-4 Family - Revolving | Purchased Impaired | 30-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due |  |  | 287 |
Residential 1-4 Family - Revolving | Purchased Impaired | 90+ Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due |  |  | 205 |
Auto |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 398,206 |  | 346,819 |
Greater Than 90 Days and Still Accruing | 166 |  | 272 |
Nonaccrual | 500 | 565 | 563 |
Total Loans | 401,324 |  | 350,419 |
Auto | Current |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total Loans | 398,206 |  |  |
Auto | 30-59 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 2,076 |  | 2,525 |
Total Loans | 2,076 |  |  |
Auto | 60-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 376 |  | 236 |
Total Loans | 376 |  |  |
Auto | 90+ Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total Loans | 166 |  |  |
Auto | Nonaccrual |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total Loans | 500 |  |  |
Auto | Purchased Impaired |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current |  |  | 4 |
Total Loans |  |  | 4 |
Auto | Purchased Impaired | 30-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due |  |  | 0 |
Auto | Purchased Impaired | 90+ Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due |  |  | 0 |
Consumer |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 245,551 |  | 367,794 |
Greater Than 90 Days and Still Accruing | 394 |  | 953 |
Nonaccrual | 69 | 88 | 77 |
Total Loans | 247,730 |  | 372,853 |
Consumer | Current |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total Loans | 245,551 |  |  |
Consumer | 30-59 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 1,166 |  | 2,128 |
Total Loans | 1,166 |  |  |
Consumer | 60-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 550 |  | 1,233 |
Total Loans | 550 |  |  |
Consumer | 90+ Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total Loans | 394 |  |  |
Consumer | Nonaccrual |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total Loans | 69 |  |  |
Consumer | Purchased Impaired |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current |  |  | 659 |
Total Loans |  |  | 668 |
Consumer | Purchased Impaired | 30-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due |  |  | 0 |
Consumer | Purchased Impaired | 90+ Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due |  |  | 9 |
Other Commercial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 489,959 |  | 286,374 |
Greater Than 90 Days and Still Accruing | 0 |  | 0 |
Nonaccrual | 0 | $ 98 | 97 |
Total Loans | 489,975 |  | 287,279 |
Other Commercial | 30-59 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 16 |  | 464 |
Other Commercial | 60-89 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] |  |  |  |
Current |  |  | 344 |
Total Loans |  |  | 344 |
Other Commercial | Purchased Impaired | 30-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due |  |  | 0 |
Other Commercial | Purchased Impaired | 90+ Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due |  |  | $ 0 |

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