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LOANS AND ALLOWANCE FOR LOAN LOSSES (Summary of Aging of the Loan Portfolio by Class) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Current | $ 14,293,262 |  | $ 12,419,378
Greater Than 90 Days and Still Accruing | 15,661 |  | 13,396
Nonaccrual | 39,023 | $ 45,204 | 28,232
Total Loans | 14,383,215 |  | 12,610,936
30-59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 23,211 |  | 50,453
60-89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 12,058 |  | 12,796
Purchased Impaired |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Current |  |  | 70,267
Total Loans | 68,800 |  | 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 | 1,200,729 |  | 1,231,043
Greater Than 90 Days and Still Accruing | 93 |  | 189
Nonaccrual | 3,520 | 4,060 | 3,703
Total Loans | 1,207,190 |  | 1,250,924
Construction and Land Development | 30-59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 2,625 |  | 4,563
Construction and Land Development | 60-89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 223 |  | 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 | 2,090,106 |  | 2,001,074
Greater Than 90 Days and Still Accruing | 1,726 |  | 1,062
Nonaccrual | 9,267 | 13,889 | 6,003
Total Loans | 2,107,333 |  | 2,041,243
Commercial Real Estate - Owner Occupied | 30-59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 4,924 |  | 3,482
Commercial Real Estate - Owner Occupied | 60-89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 1,310 |  | 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 | 3,493,107 |  | 3,269,244
Greater Than 90 Days and Still Accruing | 168 |  | 1,451
Nonaccrual | 1,992 | 1,368 | 381
Total Loans | 3,497,929 |  | 3,286,098
Commercial Real Estate - Non-Owner Occupied | 30-59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 1,291 |  | 457
Commercial Real Estate - Non-Owner Occupied | 60-89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 1,371 |  | 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 | 731,190 |  | 632,952
Greater Than 90 Days and Still Accruing | 359 |  | 474
Nonaccrual | 33 | 0 | 0
Total Loans | 731,582 |  | 633,743
Multifamily Real Estate | 30-59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due |  |  | 223
Multifamily Real Estate | 60-89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due |  |  | 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 | 3,528,283 |  | 2,099,974
Greater Than 90 Days and Still Accruing | 604 |  | 449
Nonaccrual | 1,592 | 3,037 | 1,735
Total Loans | 3,536,249 |  | 2,114,033
Commercial and Industrial | 30-59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 4,322 |  | 8,698
Commercial and Industrial | 60-89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 1,448 |  | 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 | 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 | 683,730 |  | 703,471
Greater Than 90 Days and Still Accruing | 5,298 |  | 674
Nonaccrual | 5,743 | 6,492 | 4,301
Total Loans | 696,944 |  | 724,337
Residential 1-4 Family - Commercial | 30-59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 1,236 |  | 1,479
Residential 1-4 Family - Commercial | 60-89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 937 |  | 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 | 806,055 |  | 842,667
Greater Than 90 Days and Still Accruing | 4,495 |  | 4,515
Nonaccrual | 12,620 | 13,117 | 9,292
Total Loans | 830,144 |  | 890,503
Residential 1-4 Family - Consumer | 30-59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 2,998 |  | 16,244
Total Loans | 2,998 |  |
Residential 1-4 Family - Consumer | 60-89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 3,976 |  | 3,072
Total Loans | 3,976 |  |
Residential 1-4 Family - Consumer | 90+ Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Loans | 4,495 |  |
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 | 608,570 |  | 637,966
Greater Than 90 Days and Still Accruing | 2,276 |  | 3,357
Nonaccrual | 3,664 | 2,490 | 2,080
Total Loans | 618,320 |  | 659,504
Residential 1-4 Family - Revolving | 30-59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 2,669 |  | 10,190
Total Loans | 2,669 |  |
Residential 1-4 Family - Revolving | 60-89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 1,141 |  | 1,784
Total Loans | 1,141 |  |
Residential 1-4 Family - Revolving | 90+ Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Loans | 2,276 |  |
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 | 384,619 |  | 346,819
Greater Than 90 Days and Still Accruing | 315 |  | 272
Nonaccrual | 517 | 565 | 563
Total Loans | 387,417 |  | 350,419
Auto | 30-59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 1,513 |  | 2,525
Total Loans | 1,513 |  |
Auto | 60-89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 453 |  | 236
Total Loans | 453 |  |
Auto | 90+ Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Loans | 315 |  |
Auto | Purchased Impaired |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Current |  |  | 4
Total Loans |  |  | 4
Consumer |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Current | 273,829 |  | 367,794
Greater Than 90 Days and Still Accruing | 327 |  | 953
Nonaccrual | 75 | 88 | 77
Total Loans | 276,023 |  | 372,853
Consumer | 30-59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 1,020 |  | 2,128
Total Loans | 1,020 |  |
Consumer | 60-89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 772 |  | 1,233
Total Loans | 772 |  |
Consumer | 90+ Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Loans | 327 |  |
Consumer | Purchased Impaired |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Current |  |  | 659
Total Loans |  |  | 668
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 | 493,044 |  | 286,374
Greater Than 90 Days and Still Accruing | 0 |  | 0
Nonaccrual |  | $ 98 | 97
Total Loans | 494,084 |  | 287,279
Other Commercial | 30-59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 613 |  | 464
Other Commercial | 60-89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | $ 427 |  | 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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