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LOANS AND ALLOWANCE FOR LOAN LOSSES (Summary of Loans on Nonaccrual Status) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jan. 01, 2021 | Dec. 31, 2020 | Jan. 01, 2020
--- | --- | --- | --- | ---
Financing Receivable, Nonaccrual [Line Items] |  |  |  |
Nonaccrual | $ 35,472 | $ 42,448 | $ 42,448 | $ 45,204
Nonaccrual With No ALLL | 6,178 |  | 11,497 |
Loans Past Due Over 90 Days Still Accruing | 11,030 |  | 13,634 |
Construction and Land Development |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |
Nonaccrual | 2,710 | 3,072 | 3,072 | 4,060
Nonaccrual With No ALLL | 1,985 |  | 1,985 |
Loans Past Due Over 90 Days Still Accruing | 304 |  | 0 |
Commercial Real Estate - Owner Occupied |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |
Nonaccrual | 7,786 | 7,128 | 7,128 | 13,889
Nonaccrual With No ALLL | 1,996 |  | 1,994 |
Loans Past Due Over 90 Days Still Accruing | 1,886 |  | 3,727 |
Commercial Real Estate - Non-Owner Occupied |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |
Nonaccrual | 4,174 | 2,317 | 2,317 | 1,368
Nonaccrual With No ALLL | 1,089 |  | 0 |
Loans Past Due Over 90 Days Still Accruing | 1,175 |  | 148 |
Multifamily Real Estate |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |
Nonaccrual | 113 | 33 | 33 | 0
Nonaccrual With No ALLL | 0 |  | 0 |
Loans Past Due Over 90 Days Still Accruing | 0 |  | 0 |
Commercial and Industrial |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |
Nonaccrual | 2,062 | 2,107 | 2,107 | 3,037
Nonaccrual With No ALLL | 1 |  | 1 |
Loans Past Due Over 90 Days Still Accruing | 1,256 |  | 1,114 |
Residential 1-4 Family - Commercial |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |
Nonaccrual | 2,445 | 9,993 | 9,993 | 6,492
Nonaccrual With No ALLL | 0 |  | 6,388 |
Loans Past Due Over 90 Days Still Accruing | 1,091 |  | 1,560 |
Residential 1-4 Family - Mortgage |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |
Nonaccrual | 12,150 | 12,600 | 12,600 | 13,117
Nonaccrual With No ALLL | 1,047 |  | 1,069 |
Loans Past Due Over 90 Days Still Accruing | 2,462 |  | 5,699 |
Residential 1-4 Family - Revolving |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |
Nonaccrual | 3,723 | 4,629 | 4,629 | 2,490
Nonaccrual With No ALLL | 60 |  | 60 |
Loans Past Due Over 90 Days Still Accruing | 2,474 |  | 826 |
Auto |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |
Nonaccrual | 255 | 500 | 500 | 565
Nonaccrual With No ALLL | 0 |  | 0 |
Loans Past Due Over 90 Days Still Accruing | 209 |  | 166 |
Consumer |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |
Nonaccrual | 54 | $ 69 | 69 | 88
Nonaccrual With No ALLL | 0 |  | 0 |
Loans Past Due Over 90 Days Still Accruing | 173 |  | 394 |
Other Commercial |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |
Nonaccrual | 0 |  | 0 | $ 98
Nonaccrual With No ALLL |  |  | 0 |
Loans Past Due Over 90 Days Still Accruing | $ 0 |  | $ 0 |

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