Other Real Estate Owned (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Repossessed Assets [Abstract]
Balance at beginning of year	$ 14.4	$ 13.4	$ 16.5	$ 12.7
Additions	3.6	1.7	3.7	2.5
Write-down of OREO	(2.1)	(0.7)	(4.2)	(0.8)
Dispositions	(9.2)	0.0	(9.3)	0.0
Balance at end of year	$ 6.7	$ 14.4	$ 6.7	$ 14.4