Regulatory Matters - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]
Cash dividends paid to parent Company by consolidated subsidiaries	$ 360.0	$ 52.0	$ 145.0
Amount available to be paid as dividends without prior regulatory approval	$ 941.2
Minimum ratio of qualifying total capital to risk-weighted assets	0.080
Tier 1 common equity capital required for capital adequacy to risk weighted assets	0.0450
Tier 1 risk based capital required for capital adequacy to risk weighted assets	0.060
Tier 1 leverage capital required for capital adequacy to average assets	0.040
Ratio required for banks to be well capitalized, total capital to risk-weighted assets	0.100
Ratio required for banks to be well capitalized, Tier 1 capital to risk-weighted assets	0.080
Ratio required for banks to be well capitalized, Common Equity Tier 1 capital risk weighted assets	0.065
Ratio required for banks to be well capitalized, Tier 1 leverage ratio	0.050