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LOANS AND CREDIT QUALITY - Narrative (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loan and lease receivables | $ 14,568,795 | $ 9,643,497
Accrued interest receivable | 54,900 | 33,600
Asset Pledged as Collateral | Federal Home Loan Bank Advances |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loan and lease receivables | 6,600,000 |
Asset Pledged as Collateral | Federal Reserve Bank Advances |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loan and lease receivables | $ 1,400,000 |
Commercial And Residential Real Estate Portfolio Segment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percent of total loans | 76.00% |
Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loan and lease receivables | $ 5,448,374 | 2,794,581
Commercial real estate | Multifamily |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loan and lease receivables | $ 5,448,374 | 2,794,581
Percent of total loans | 37.00% |
Residential Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loan and lease receivables | $ 3,907,101 | $ 2,280,963
Percent of total loans | 27.00% |

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