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LOANS AND ALLOWANCE FOR LOAN LOSSES - Allowance for Loan Losses Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Charge-offs recorded |  | $ 41,766 | $ 18,499 | $ 5,581
Loans receivable |  | 5,951,885 | 7,700,873 |
Line of credit |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Charge-offs recorded | $ 13,900 | 35,100 |  |
Loans receivable | $ 15,000 |  |  |
Unfunded loan commitment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Reserve for unfunded loan commitments |  | 4,100 | 4,600 |
Commercial | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Charge-offs recorded |  | 36,787 | 1,927 |
Change in allowance |  | 3,000 |  |
Loans receivable |  | $ 1,691,270 | $ 1,944,142 |

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