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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Allowance for Loan Losses Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses recovery from settlement of charged off | $ 31,300 |  |
Initial reserve based on ACL methodology | 0 | $ 16,200 | $ 0
Loans receivable | 7,115,038 | 7,251,480 |
Allowance for Loan Losses |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Recoveries | 33,896 | 3,358 |
Loans Receivable |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accrued interest receivable | 28,600 | 25,800 |
PCD loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Initial reserve based on ACL methodology |  | 13,700 |
Shared National Credit |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable |  |  | 16,100
Charge-offs |  |  | 10,700
Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Recoveries | 33,896 | 3,358 | 1,815
Commercial real estate | Allowance for Loan Losses |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Recoveries | 33,896 | 3,358 | $ 1,815
Commercial real estate | PCD loans | Allowance for Loan Losses |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Recoveries |  | 2,600 |
Unfunded loan commitment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Reserve for unfunded loan commitments | 5,300 | 5,600 |
Initial reserve based on ACL methodology |  | 11,300 |
Commercial | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable | 1,259,651 | 1,311,105 |
Commercial | Commercial real estate | Allowance for Loan Losses |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Recoveries | $ 7 | 0 |
Commercial and industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Net charge-offs |  | 4,400 |
SBA |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Net charge-offs |  | $ 2,000 |

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