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FAIR VALUE - Unobservable Inputs Information (Details) - Mortgage servicing rights - Discounted cash flow - Unobservable inputs Level 3
Dec. 31, 2023
Dec. 31, 2022
Constant prepayment rate | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable input (percent) 0.080 0.080
Constant prepayment rate | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable input (percent) 0.103 0.094
Constant prepayment rate | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable input (percent) 0.082 0.081
Discount rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable input (percent) 0.120 0.120
Discount rate | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable input (percent) 0.120 0.120