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Regulatory Matters - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract] |  |  |
Cash dividends paid to parent Company by consolidated subsidiaries | $ 600.0 | $ 475.0 | $ 360.0
Amount available to be paid as dividends without prior regulatory approval | $ 929.8 |  |
Minimum ratio of qualifying total capital to risk-weighted assets (as a percent) | 0.080 |  |
Tier 1 common equity capital required for capital adequacy to risk weighted assets (as a percent) | 0.0450 |  |
Tier 1 risk based capital required for capital adequacy to risk weighted assets (as a percent) | 0.060 |  |
Tier 1 leverage capital required for capital adequacy to average assets (as a percent) | 0.040 |  |
Ratio required for banks to be well capitalized, total capital to risk-weighted assets (as a percent) | 0.100 |  |
Ratio required for banks to be well capitalized, Tier 1 capital to risk-weighted assets (as a percent) | 0.080 |  |
Ratio required for banks to be well capitalized, common equity Tier 1 capital risk weighted assets (as a percent) | 0.065 |  |
Ratio required for banks to be well capitalized, Tier 1 leverage ratio (as a percent) | 0.050 |  |

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