Loans and Leases - Narrative (Details) - USD ($) $ in Millions		3 Months Ended	9 Months Ended
	Mar. 27, 2023	Sep. 30, 2023	Sep. 30, 2023	Dec. 31, 2022
Receivables [Abstract]
Financing receivable, accrued interest receivable		$ 620.0	$ 620.0	$ 203.0
Financing receivable, amortization of purchase discount		$ 275.0	$ 535.0
Financing receivable, threshold period past due		30 days	30 days
Other real estate owned		$ 62.0	$ 62.0	47.0
Financing receivable, troubled debt restructuring, commitment to lend		$ 25.0	25.0	$ 1.5
Accounts, Notes, Loans and Financing Receivable [Line Items]
Modified loans that subsequently defaulted			21.0
Innovation C&I and cash flow dependent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Modified loans that subsequently defaulted			15.0
Investor dependent - early stage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Modified loans that subsequently defaulted			$ 3.0
SVB | FDIC Credit Facility
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt instrument, term	5 years
FDIC advances, maximum amount available	$ 70,000.0