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ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LEASES - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Line Items]                
Percentage of increase, housing price index 3.40%   3.40%     7.40%    
Percentage of increase, commercial real estate price index (4.00%)   (4.00%)     3.90%    
Percentage of increase (decline), S&P volatility in next fiscal year 91.10%   91.10%     34.90%    
Percentage of increase (decline), S&P volatility in next second year (19.80%)   (19.80%)     2.50%    
ACL on loans and leases $ 437.0   $ 437.0     $ 423.0    
Provision for credit losses 24.0 $ 23.0 67.1 $ 57.5        
Allowance for credit losses on loans and leases                
Financing Receivable, Allowance for Credit Loss [Line Items]                
ACL on loans and leases $ 437.3 420.2 437.3 420.2 $ 432.1 $ 422.8 $ 418.8 $ 405.6
Financing receivable, allowance for credit loss, period increase (decrease)     $ 14.5          
Financing receivable, allowance for credit loss, period increase, percentage     3.40%          
Financing receivable, allowance for credit loss, ratio 1.25%   1.25%     1.25%    
Provision for credit losses $ 24.9 22.9 $ 68.5 56.7        
Charge-offs $ 19.7 $ 21.5 $ 54.0 $ 42.1        
Financing receivable, allowance for credit loss, net charge-offs (recovery), percentage 0.22% 0.25% 0.21% 0.17%        
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 $ 457.4 $ 442.6 $ 457.4 $ 442.6 $ 453.1 $ 444.2 $ 440.6 $ 427.1
Provision for credit losses 24.0 23.5 67.2 57.6        
Charge-offs $ 19.7 $ 21.5 $ 54.0 $ 42.1