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Derivatives - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Securities fair value hedges        
Derivative [Line Items]        
Reclassification of fair value hedge from AOCI into income $ (2.8)   $ (2.0)  
Fair value hedge gain (loss) reclassified 0.3 $ 0.2 0.3 $ 0.5
Residential mortgage fair value hedges        
Derivative [Line Items]        
Gain (loss) on derivative instruments $ 0.9   $ (1.8)