v3.26.3
LOAN SERVICING - Schedule of Activity in MSR (Details) - Mortgage Servicing Rights - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Servicing Assets at Fair Value [Line Items]          
Mortgage loans sold with servicing retained $ 7,690.0   $ 7,690.0   $ 7,062.0
Mortgage loans sold with servicing retained 481.0 $ 415.0 1,546.0 $ 1,050.0  
Pre-tax net gains (losses) resulting from above loan sales 4.0 8.0 18.0 17.0  
Mortgage servicing fees 5.0 5.0 14.0 13.0  
Servicing Asset at Amortized Cost, Balance [Roll Forward]          
Balance at beginning of period 75.3 72.2 73.5 70.5  
Additions 6.3 4.6 17.3 10.6  
Payoffs and curtailments (1.3) (1.2) (5.0) (3.3)  
Impairment (charge) / recovery (0.4) (0.1) (0.3) (0.1)  
Amortization / other (2.7) (1.8) (8.3) (4.0)  
Balance at end of period 77.2 73.7 77.2 73.7  
Fair value, beginning of period 94.9 85.5 88.2 86.3  
Fair value, end of period $ 116.1 $ 87.0 $ 116.1 $ 87.0