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Regulatory Capital - U.S. Basel III Regulatory Requirements (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Actual Amount |  |
Common Equity Tier 1 Capital (to Risk-Weighted Assets) | $ 2,977,353 | $ 3,019,973
Tier 1 Capital (to Risk-Weighted Assets) | 2,977,353 | 3,019,973
Total Capital (to Risk-Weighted Assets) | 3,290,809 | 3,334,140
Tier 1 Capital (to Average Assets) | $ 2,977,353 | $ 3,019,973
Actual Ratio |  |
Common Equity Tier 1 Capital (to Risk-Weighted Assets) | 12.30% | 12.30%
Tier 1 Capital (to Risk-Weighted Assets) | 0.123 | 0.123
Total Capital (to Risk-Weighted Assets) | 0.135 | 0.136
Tier 1 Capital (to Average Assets) | 0.102 | 0.102
U.S. Basel III Regulatory Requirements, Amount |  |
Common Equity Tier 1 Capital (to Risk-Weighted Assets) | $ 1,700,543 | $ 1,719,621
Tier 1 Capital (to Risk-Weighted Assets) | 2,064,945 | 2,088,111
Total Capital (to Risk-Weighted Assets) | 2,550,814 | 2,579,432
Tier 1 Capital (to Average Assets) | $ 1,170,715 | $ 1,184,213
U.S. Basel III Regulatory Requirements, Ratio |  |
Common Equity Tier 1 Capital (to Risk-Weighted Assets) | 7.00% | 7.00%
Tier 1 Capital (to Risk-Weighted Assets) | 0.085 | 0.085
Total Capital (to Risk-Weighted Assets) | 0.105 | 0.105
Tier 1 Capital (to Average Assets) | 0.040 | 0.040

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- Definition Amount of total capital as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480696/942-505-50-1 + Details
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