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LOANS AND LEASES - Additional Information (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) Loan | Dec. 31, 2023 USD ($)
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Loan receivable, validate risk ratings performed for large sample or new lending to existing relationships |  | $ 1,000,000 |
Loan receivable, validate risk ratings performed for criticized and classified rated borrowers with relationship exposure, value |  | 500,000 |
Loan receivable, validate risk ratings performed for new federal reserve board regulation "O" loan commitments, value |  | 1,000,000 |
Loan receivable validate risk ratings performed for leveraged loans, value |  | 1,000,000 |
Loan receivable validate risk ratings performed for no borrower with commitments, value |  | 500,000 |
Allowance for credit losses, recorded investment nonaccrual status |  | 80,453,000 | $ 61,324,000
Financial receivable modifications | $ 0 |  |
Multifamily Property [Member] |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Financing receivable individually evaluated loan |  | $ 15,100,000 |
Number of multifamily loans | Loan |  | 2 |
Equipment Financing Lease [Member] |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Number of loans modified | Loan |  | 1 |
Financing receivable modified in period amount |  | $ 10,500,000 |
Commercial Real Estate Portfolio Segment [Member] |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Number of loans modified | Loan |  | 1 |
Financing receivable modified in period amount |  | $ 17,300,000 |
Commercial Portfolio Segment [Member] |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Number of loans modified | Loan |  | 1 |
Financing receivable modified in period amount |  | $ 11,700,000 |
Substandard [Member] |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Financing receivable individually evaluated loan |  | 80,000,000 | $ 60,600,000
Substandard [Member] | Multifamily Property [Member] |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Financing receivable increase in individually evaluated substandard loans |  | $ 31,800,000 |
Number of multifamily loans | Loan |  | 6 |
Substandard [Member] | 30-89 Days Past Due [Member] | Multifamily Property [Member] |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Allowance for credit losses, recorded investment nonaccrual status |  | $ 19,700,000 |
Minimum [Member] |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Loan receivable, validate risk ratings performed for large sample of borrowers with relationship, value |  | 1,000,000 |
Maximum [Member] |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Loan receivable, validate risk ratings performed for small sample of borrowers with relationship, value |  | $ 1,000,000 |

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