Commitments and Contingencies (Details) - USD ($) $ in Millions			3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 20, 2024	Aug. 14, 2023	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024	Dec. 31, 2023
Loss Contingencies [Line Items]
Other noninterest expense			$ 158.0	$ 174.0	$ 356.0	$ 280.0
Judicial ruling
Loss Contingencies [Line Items]
Litigation interest	$ 199.7
Senior Preferred Stock Purchase Agreements Litigation
Loss Contingencies [Line Items]
Awarded damages to Fannie Mae		$ 299.4
Litigation interest rate	5.01%
Other noninterest expense			$ 7.0		$ 13.0		$ 24.0	$ 495.0