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ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LEASES - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Percentage of increase, housing price index | 5.60% |  | 5.60% |  |  | 7.40% |  |
Percentage of increase, commercial real estate price index | (1.30%) |  | (1.30%) |  |  | 3.90% |  |
Percentage of increase (decline), S&P volatility in next fiscal year | 87.70% |  | 87.70% |  |  | 34.90% |  |
Percentage of increase (decline), S&P volatility in next second year | (22.70%) |  | (22.70%) |  |  | 2.50% |  |
ACL on loans and leases | $ 432.0 |  | $ 432.0 |  |  | $ 423.0 |  |
Provision for credit losses | 26.0 | $ 20.0 | 43.1 | $ 34.1 |  |  |  |
Allowance for credit losses on loans and leases |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
ACL on loans and leases | $ 432.1 | 418.8 | 432.1 | 418.8 | $ 428.9 | $ 422.8 | $ 406.3 | $ 405.6
Financing receivable, allowance for credit loss, period increase (decrease) |  |  | $ 9.3 |  |  |  |  |
Financing receivable, allowance for credit loss, period increase, percentage |  |  | 2.20% |  |  |  |  |
Financing receivable, allowance for credit loss, ratio | 1.25% |  | 1.25% |  |  | 1.25% |  |
Provision for credit losses | $ 25.0 | 20.3 | $ 43.6 | 33.8 |  |  |  |
Charge-offs | $ 21.8 | $ 7.8 | $ 34.3 | $ 20.6 |  |  |  |
Financing receivable, allowance for credit loss, net charge-offs (recovery), percentage | 0.25% | 0.09% | 0.20% | 0.13% |  |  |  |
Allowance for credit losses on loans and leases and allowance for unfunded loan commitments |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
ACL on loans and leases | $ 453.1 | $ 440.6 | $ 453.1 | $ 440.6 | $ 449.2 | $ 444.2 | $ 428.2 | $ 427.1
Provision for credit losses | 25.7 | 20.2 | 43.2 | 34.1 |  |  |  |
Charge-offs | $ 21.8 | $ 7.8 | $ 34.3 | $ 20.6 |  |  |  |

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