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FAIR VALUE MEASUREMENTS - Additional Information (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Fair Value Measurements Disclosure [Line Items]      
Collateral dependent loans, allowance for credit loss $ 24.6    
Provision for fair value measurements included in allowance for loan losses 41.4    
Mortgage Servicing Rights      
Fair Value Measurements Disclosure [Line Items]      
MSRs valuation allowance 0.2   $ 0.1
Fair Value, Nonrecurring      
Fair Value Measurements Disclosure [Line Items]      
Collateral dependent loans carrying value 91.1    
Fair Value, Nonrecurring | Mortgage Servicing Rights      
Fair Value Measurements Disclosure [Line Items]      
MSRs carrying value 1.3    
MSRs valuation allowance 0.2    
Fair Value, Nonrecurring | Mortgage Servicing Rights | Provision Expense      
Fair Value Measurements Disclosure [Line Items]      
Provision relating to the valuation allowance for MSRs 0.1    
Loans Receivable | Fair Value, Recurring      
Fair Value Measurements Disclosure [Line Items]      
Transfer into (from) level 3 $ 24.6 $ 49.2