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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Mortgage Banking (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total residential loans included in held for sale loans | $ 7,505 |  | $ 7,505 |  | $ 23,988
Residential mortgages | Total residential real estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total residential loans included in held for sale loans | 7,500 |  | 7,500 |  | 24,000
Forward delivery commitments | 14,500 |  | 14,500 |  | $ 50,600
Sale of loans | 28,500 | $ 86,200 | 153,900 | $ 156,000 |
Net gains on sales of loans | $ 682 | $ 2,200 | $ 3,600 | $ 3,100 |

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