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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Allowance for Loan Losses Additional Information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) Loan | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable |  | $ 5,898,405 | $ 5,951,885 |
Provision (reversal of provision) |  | 29,719 | 35,829 | $ 31,121
Commercial lending relationship threshold | $ 5,000 |  |  |
Loans Receivable |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accrued interest receivable |  | 24,700 | 18,800 |
Line of credit |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable |  |  |  | 15,000
Charge-offs recorded |  |  |  | $ 13,900
Shared National Credit |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable |  |  | 16,100 |
Charge-offs recorded |  | 10,700 |  |
Unfunded loan commitment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Count | Loan | 53 |  |  |
Commitments to purchase or sell | $ 536,000 |  |  |
Commercial | Loans Receivable |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Charge-off of line of credit |  |  | 35,100 |
Commercial | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable |  | $ 2,088,308 | $ 1,691,270 |

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