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LOANS AND LEASES - Schedule of Loan and Lease Portfolio by Category (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for credit losses | $ 197,490 | $ 198,253 | $ 186,126 | $ 175,988 | $ 171,869 | $ 151,861
Net loans and leases | 13,124,684 |  | 12,583,202 |  |  |
Reverse mortgage, fair value | 3,200 |  | 2,800 | 2,800 |  |
Financing Receivable Portfolio Segment, Including Reverse Mortgages |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 13,322,174 |  | 12,769,328 |  |  |
Commercial | Commercial and industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 2,639,266 |  | 2,540,070 |  |  |
Allowance for credit losses | 56,795 | 56,516 | 49,394 | 51,678 | 52,400 | 49,526
Commercial | Owner-occupied commercial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 2,003,722 |  | 1,886,087 |  |  |
Allowance for credit losses | 9,787 | 9,668 | 10,719 | 7,850 | 6,335 | 6,019
Commercial | Commercial mortgages |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 4,149,049 |  | 3,801,180 |  |  |
Allowance for credit losses | 48,989 | 46,831 | 36,055 | 33,187 | 31,937 | 21,473
Commercial | Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 805,857 |  | 1,035,530 |  |  |
Allowance for credit losses | 8,348 | 9,198 | 10,762 | 11,317 | 9,228 | 6,987
Commercial | Commercial Small Business Leases |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 645,421 |  | 623,622 |  |  |
Allowance for credit losses | 15,374 | 16,218 | 15,170 | 9,992 | 10,383 | 9,868
Residential |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 940,780 |  | 870,705 |  |  |
Allowance for credit losses | 5,463 | 5,057 | 5,483 | 5,351 | 5,043 | 4,668
Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 2,138,079 |  | 2,012,134 |  |  |
Allowance for credit losses | $ 52,734 | $ 54,765 | $ 58,543 | $ 56,613 | $ 56,543 | $ 53,320

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