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Loans - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Net deferred costs $ 44.9   $ 44.9   $ 43.1
Loans sold     9.1    
Gain on sale of loans     0.9    
Accrued interest receivable 38.8   38.8   39.4
Interest income on nonaccrual loans $ 0.2 $ 0.4 1.1 $ 0.8  
Loans          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Remaining fair value adjustment for loans acquired     $ 141.8   $ 174.0
Percentage of fair value adjustment for loans acquired 4.50%   4.50%   4.80%