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Regulatory Capital - U.S. Basel III Regulatory Requirements (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Actual Amount |  |
Common Equity Tier 1 Capital (to Risk-Weighted Assets) | $ 2,992,368 | $ 2,957,067
Tier 1 Capital (to Risk-Weighted Assets) | 2,992,368 | 2,957,067
Total Capital (to Risk-Weighted Assets) | 3,329,485 | 3,294,663
Tier 1 Capital (to Average Assets) | $ 2,992,368 | $ 2,957,067
Actual Ratio |  |
Common Equity Tier 1 Capital (to Risk-Weighted Assets) | 11.60% | 11.30%
Tier 1 Capital (to Risk-Weighted Assets) | 0.116 | 0.113
Total Capital (to Risk-Weighted Assets) | 0.129 | 0.126
Tier 1 Capital (to Average Assets) | 0.101 | 0.097
U.S. Basel III Minimum Requirements Plus Buffer, Amount |  |
Common Equity Tier 1 Capital (to Risk-Weighted Assets) | $ 1,808,123 | $ 1,827,318
Tier 1 Capital (to Risk-Weighted Assets) | 2,195,578 | 2,218,886
Total Capital (to Risk-Weighted Assets) | 2,712,184 | 2,740,976
Tier 1 Capital (to Average Assets) | $ 1,185,745 | $ 1,213,505
U.S. Basel III Minimum Requirements Plus Buffer, 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/1943274/2147477270/942-505-50-1 + Details
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