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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Summary of TDR Modification Type (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) loan Loan | Dec. 31, 2019 USD ($) loan Loan | Dec. 31, 2018 USD ($) loan Loan
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Loans | loan | 1 | 14 | 3
Pre- Modification Outstanding Recorded Investment | $ 5,000 | $ 21,726 | $ 358
Post-Modification Outstanding Recorded Investment | $ 5,000 | $ 19,062 | $ 350
Number of loans modified as a TDR during past 12 months that had a subsequent payment default | Loan |  | 0 | 0
Change in Principal Payments and Interest Rates |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Loans | loan | 0 | 14 | 0
Post-Modification Outstanding Recorded Investment | $ 0 | $ 19,062 | $ 0
Change in Principal Payments |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Loans | loan | 0 | 0 | 2
Post-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 163
Extension of Maturity(1) |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Loans | loan | 1 | 0 | 0
Post-Modification Outstanding Recorded Investment | $ 5,000 | $ 0 | $ 0
Other |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Loans | loan | 0 | 0 | 1
Post-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 187
Commercial | Commercial and industrial |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Loans | loan | 1 | 12 | 2
Pre- Modification Outstanding Recorded Investment | $ 5,000 | $ 18,512 | $ 171
Post-Modification Outstanding Recorded Investment | $ 5,000 | $ 18,193 | $ 163
Commercial | Commercial and industrial | Change in Principal Payments and Interest Rates |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Loans | loan | 0 | 12 | 0
Post-Modification Outstanding Recorded Investment | $ 0 | $ 18,193 | $ 0
Commercial | Commercial and industrial | Change in Principal Payments |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Loans | loan | 0 | 0 | 2
Post-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 163
Commercial | Commercial and industrial | Extension of Maturity(1) |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Loans | loan | 1 | 0 | 0
Post-Modification Outstanding Recorded Investment | $ 5,000 | $ 0 | $ 0
Commercial | Commercial and industrial | Other |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Loans | loan | 0 | 0 | 0
Post-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 0
Commercial | SBA |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Loans | loan | 0 | 2 | 1
Pre- Modification Outstanding Recorded Investment | $ 0 | $ 3,214 | $ 187
Post-Modification Outstanding Recorded Investment | $ 0 | $ 869 | $ 187
Number of loans modified as a TDR during past 12 months that had a subsequent payment default | Loan | 1 |  |
Commercial | SBA | Change in Principal Payments and Interest Rates |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Loans | loan |  | 2 | 0
Post-Modification Outstanding Recorded Investment |  | $ 869 | $ 0
Commercial | SBA | Change in Principal Payments |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Loans | loan |  | 0 | 0
Post-Modification Outstanding Recorded Investment |  | $ 0 | $ 0
Commercial | SBA | Extension of Maturity(1) |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Loans | loan |  | 0 | 0
Post-Modification Outstanding Recorded Investment |  | $ 0 | $ 0
Commercial | SBA | Other |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Loans | loan |  | 0 | 1
Post-Modification Outstanding Recorded Investment |  | $ 0 | $ 187

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