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Regulatory Capital - U.S. Basel III Regulatory Requirements (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Actual Amount |  |
Common Equity Tier 1 Capital (to Risk-Weighted Assets) | $ 3,040,662 | $ 3,314,657
Tier 1 Capital (to Risk-Weighted Assets) | 3,040,662 | 3,314,657
Total Capital (to Risk-Weighted Assets) | 3,338,645 | 3,410,183
Tier 1 Capital (to Average Assets) | $ 3,040,662 | $ 3,314,657
Actual Ratio |  |
Common Equity Tier 1 Capital (to Risk-Weighted Assets) | 12.90% | 14.10%
Tier 1 Capital (to Risk-Weighted Assets) | 0.129 | 0.141
Total Capital (to Risk-Weighted Assets) | 0.142 | 0.145
Tier 1 Capital (to Average Assets) | 0.103 | 0.111
Well Capitalized Regulatory Requirements, Amount |  |
Common Equity Tier 1 Capital (to Risk-Weighted Assets) | $ 1,645,807 | $ 1,643,132
Tier 1 Capital (to Risk-Weighted Assets) | 1,998,480 | 1,995,232
Total Capital (to Risk-Weighted Assets) | 2,468,711 | 2,464,699
Tier 1 Capital (to Average Assets) | $ 1,185,280 | $ 1,198,808
Well Capitalized 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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