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Business Combinations - Narrative (Details) $ in Millions				3 Months Ended	6 Months Ended		12 Months Ended
	Mar. 31, 2023 shares	Mar. 20, 2023 USD ($) branch	Mar. 19, 2023 USD ($)	Mar. 31, 2024 USD ($)	Jun. 30, 2024 USD ($) branch	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Business Acquisition [Line Items]
Number of traditional branches					419
Settlement period					1 year
Bargain purchase gain | $							$ 2,000
Reduction to bargain purchase gain | $				$ 121	$ 121	$ (2,142)
Signature Bridge Bank
Business Acquisition [Line Items]
Bargain purchase gain | $		$ 2,010	$ 2,010
Restructuring charges | $		$ 259
Signature Bridge Bank | FDIC
Business Acquisition [Line Items]
Shares issued (in shares) | shares	13,010,668
New York | Signature Bridge Bank
Business Acquisition [Line Items]
Number of traditional branches		29
California | Signature Bridge Bank
Business Acquisition [Line Items]
Number of traditional branches		7
North Carolina | Signature Bridge Bank
Business Acquisition [Line Items]
Number of traditional branches		2
Connecticut | Signature Bridge Bank
Business Acquisition [Line Items]
Number of traditional branches		1
Nevada | Signature Bridge Bank
Business Acquisition [Line Items]
Number of traditional branches		1

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