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LOANS AND ALLOWANCE FOR LOAN LOSSES (Summary of Aging of the Loan Portfolio by Class) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Jan. 01, 2021 | Dec. 31, 2020 | Jan. 01, 2020
--- | --- | --- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | $ 14,194,400 |  | $ 13,929,049 |
Current, % of total loans | 99.45% |  | 99.34% |
Greater Than 90 Days and Still Accruing | $ 9,776 |  | $ 13,634 |
Greater than 90 Days and still Accruing, % of total loans | 0.07% |  | 0.10% |
Nonaccrual | $ 41,866 | $ 42,448 | $ 42,448 | $ 45,204
Nonaccrual, % of total loans | 0.29% |  | 0.30% |
Total Loans | $ 14,272,280 |  | $ 14,021,314 |
Total loans, % of total loans | 100.00% |  | 100.00% |
30-59 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | $ 20,687 |  | $ 27,024 |
Past Due, % of total loans | 0.15% |  | 0.19% |
60-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | $ 5,551 |  | $ 9,159 |
Past Due, % of total loans | 0.04% |  | 0.07% |
Construction and Land Development |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | $ 880,139 |  | $ 920,276 |
Greater Than 90 Days and Still Accruing | 189 |  | 0 |
Nonaccrual | 2,637 | 3,072 | 3,072 | 4,060
Total Loans | 884,303 |  | 925,798 |
Construction and Land Development | 30-59 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 865 |  | 1,903 |
Construction and Land Development | 60-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 473 |  | 547 |
Commercial Real Estate - Owner Occupied |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 2,069,019 |  | 2,114,804 |
Greater Than 90 Days and Still Accruing | 3,180 |  | 3,727 |
Nonaccrual | 7,016 | 7,128 | 7,128 | 13,889
Total Loans | 2,083,155 |  | 2,128,909 |
Commercial Real Estate - Owner Occupied | 30-59 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 3,426 |  | 1,870 |
Commercial Real Estate - Owner Occupied | 60-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 514 |  | 1,380 |
Commercial Real Estate - Non-Owner Occupied |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 3,666,228 |  | 3,651,232 |
Greater Than 90 Days and Still Accruing | 817 |  | 148 |
Nonaccrual | 1,958 | 2,317 | 2,317 | 1,368
Total Loans | 3,671,471 |  | 3,657,562 |
Commercial Real Estate - Non-Owner Occupied | 30-59 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 1,055 |  | 2,144 |
Commercial Real Estate - Non-Owner Occupied | 60-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 1,413 |  | 1,721 |
Multifamily Real Estate |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 842,638 |  | 814,095 |
Greater Than 90 Days and Still Accruing | 0 |  | 0 |
Nonaccrual | 0 | 33 | 33 | 0
Total Loans | 842,906 |  | 814,745 |
Multifamily Real Estate | 30-59 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 187 |  | 617 |
Multifamily Real Estate | 60-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 81 |  | 0 |
Commercial and Industrial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 3,593,508 |  | 3,257,201 |
Greater Than 90 Days and Still Accruing | 654 |  | 1,114 |
Nonaccrual | 2,023 | 2,107 | 2,107 | 3,037
Total Loans | 3,599,884 |  | 3,263,460 |
Commercial and Industrial | 30-59 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 3,086 |  | 1,848 |
Commercial and Industrial | 60-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 613 |  | 1,190 |
Residential 1-4 Family - Commercial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 645,684 |  | 657,351 |
Greater Than 90 Days and Still Accruing | 576 |  | 1,560 |
Nonaccrual | 9,190 | 9,993 | 9,993 | 6,492
Total Loans | 658,051 |  | 671,949 |
Residential 1-4 Family - Commercial | 30-59 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 1,803 |  | 2,227 |
Residential 1-4 Family - Commercial | 60-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 798 |  | 818 |
Residential 1-4 Family - Consumer |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 791,466 |  | 792,852 |
Greater Than 90 Days and Still Accruing | 3,041 |  | 5,699 |
Nonaccrual | 14,770 | 12,600 | 12,600 | 13,117
Total Loans | 816,916 |  | 822,866 |
Residential 1-4 Family - Consumer | Current |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total Loans | 791,466 |  | 792,852 |
Residential 1-4 Family - Consumer | 30-59 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 6,831 |  | 10,182 |
Total Loans | 6,831 |  | 10,182 |
Residential 1-4 Family - Consumer | 60-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 808 |  | 1,533 |
Total Loans | 808 |  | 1,533 |
Residential 1-4 Family - Consumer | 90+ Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total Loans | 3,041 |  | 5,699 |
Residential 1-4 Family - Consumer | Nonaccrual |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total Loans | 14,770 |  | 12,600 |
Residential 1-4 Family - Revolving |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 557,335 |  | 587,522 |
Greater Than 90 Days and Still Accruing | 917 |  | 826 |
Nonaccrual | 3,853 | 4,629 | 4,629 | 2,490
Total Loans | 563,786 |  | 596,996 |
Residential 1-4 Family - Revolving | Current |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total Loans | 557,335 |  | 587,522 |
Residential 1-4 Family - Revolving | 30-59 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 1,397 |  | 2,975 |
Total Loans | 1,397 |  | 2,975 |
Residential 1-4 Family - Revolving | 60-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 284 |  | 1,044 |
Total Loans | 284 |  | 1,044 |
Residential 1-4 Family - Revolving | 90+ Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total Loans | 917 |  | 826 |
Residential 1-4 Family - Revolving | Nonaccrual |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total Loans | 3,853 |  | 4,629 |
Auto |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 404,692 |  | 398,206 |
Greater Than 90 Days and Still Accruing | 154 |  | 166 |
Nonaccrual | 303 | 500 | 500 | 565
Total Loans | 406,349 |  | 401,324 |
Auto | Current |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total Loans | 404,692 |  | 398,206 |
Auto | 30-59 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 1,035 |  | 2,076 |
Total Loans | 1,035 |  | 2,076 |
Auto | 60-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 165 |  | 376 |
Total Loans | 165 |  | 376 |
Auto | 90+ Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total Loans | 154 |  | 166 |
Auto | Nonaccrual |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total Loans | 303 |  | 500 |
Consumer |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 214,438 |  | 245,551 |
Greater Than 90 Days and Still Accruing | 248 |  | 394 |
Nonaccrual | 116 | $ 69 | 69 | 88
Total Loans | 215,711 |  | 247,730 |
Consumer | Current |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total Loans | 214,438 |  | 245,551 |
Consumer | 30-59 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 595 |  | 1,166 |
Total Loans | 595 |  | 1,166 |
Consumer | 60-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 314 |  | 550 |
Total Loans | 314 |  | 550 |
Consumer | 90+ Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total Loans | 248 |  | 394 |
Consumer | Nonaccrual |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total Loans | 116 |  | 69 |
Other Commercial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 529,253 |  | 489,959 |
Greater Than 90 Days and Still Accruing | 0 |  | 0 |
Nonaccrual | 0 |  | 0 | $ 98
Total Loans | 529,748 |  | 489,975 |
Other Commercial | 30-59 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 407 |  | 16 |
Other Commercial | 60-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | $ 88 |  | $ 0 |

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