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LOANS AND LEASES - Additional Information (Details) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2024 USD ($) loans | Mar. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ 200,000 | $ 0 |  |
Real Estate Acquired Through Foreclosure | 161,000 | 191,000 | $ 106,000 | $ 191,000
Loans and Leases Receivable, Net of Deferred Income | 11,205,120,000 |  | 10,933,176,000 |
Unused Commitments to Extend Credit | $ 3,953,058,000 |  | 3,982,599,000 |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | loans | 3 |  |  |
Commercial segment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Leases Receivable, Net of Deferred Income | $ 14,532,000 |  | 15,746,000 |
Residential real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Restructured Loans, Loan Relationships, Review Threshold Amount Minimum | 250,000 |  |  |
Loans and Leases Receivable, Net of Deferred Income | 12,836,000 |  | 14,067,000 |
Lease financing |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Leases Receivable, Net of Deferred Income | 3,794,000 |  | $ 3,610,000 |
Financial Difficulty Modification |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Unused Commitments to Extend Credit | $ 0 | $ 0 |  |

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