Litigation and Regulatory Matters - Narrative (Details) $ in Millions	1 Months Ended
	May 31, 2023 USD ($) defendant	Jun. 30, 2023 USD ($)
Loss Contingencies [Line Items]
Estimate of reasonably possible loss		$ 125
Interest Rate Swap Investigation
Loss Contingencies [Line Items]
Damages paid	$ 45
Unapproved Electronic Messaging Platforms Investigation
Loss Contingencies [Line Items]
Damages paid	$ 30
HSBC Bank USA and its Subsidiaries | First Citizens Litigation
Loss Contingencies [Line Items]
Number of employees involved in litigation | defendant	7