Subsequent Event - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2026 USD ($) board_member	Sep. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)
Subsequent Event [Line Items]
Assets		$ 212,903.0	$ 212,927.0
Comerica Incorporated
Subsequent Event [Line Items]
Assets		$ 77,000.0
Comerica Incorporated | Subsequent Event
Subsequent Event [Line Items]
Share exchange ratio	1.8663
Expected acquisition price	$ 10,900.0
Number of board members | board_member	3