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Regulatory Capital - U.S. Basel III Regulatory Requirements (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Actual Amount |  |
Common Equity Tier 1 Capital (to Risk-Weighted Assets) | $ 2,979,433 | $ 3,040,662
Tier 1 Capital (to Risk-Weighted Assets) | 2,979,433 | 3,040,662
Total Capital (to Risk-Weighted Assets) | 3,297,674 | 3,338,645
Tier 1 Capital (to Average Assets) | $ 2,979,433 | $ 3,040,662
Actual Ratio |  |
Common Equity Tier 1 Capital (to Risk-Weighted Assets) | 12.00% | 12.90%
Tier 1 Capital (to Risk-Weighted Assets) | 0.120 | 0.129
Total Capital (to Risk-Weighted Assets) | 0.133 | 0.142
Tier 1 Capital (to Average Assets) | 0.100 | 0.103
U.S. Basel III Regulatory Requirements, Amount |  |
Common Equity Tier 1 Capital (to Risk-Weighted Assets) | $ 1,738,576 | $ 1,645,807
Tier 1 Capital (to Risk-Weighted Assets) | 2,111,128 | 1,998,480
Total Capital (to Risk-Weighted Assets) | 2,607,863 | 2,468,711
Tier 1 Capital (to Average Assets) | $ 1,188,369 | $ 1,185,280
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 -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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