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Regulatory Capital - U.S. Basel III Regulatory Requirements (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Actual Amount |  |
Common Equity Tier 1 Capital (to Risk-Weighted Assets) | $ 3,019,973 | $ 3,040,662
Tier 1 Capital (to Risk-Weighted Assets) | 3,019,973 | 3,040,662
Total Capital (to Risk-Weighted Assets) | 3,334,140 | 3,338,645
Tier 1 Capital (to Average Assets) | $ 3,019,973 | $ 3,040,662
Actual Ratio |  |
Common Equity Tier 1 Capital (to Risk-Weighted Assets) | 12.30% | 12.90%
Tier 1 Capital (to Risk-Weighted Assets) | 0.123 | 0.129
Total Capital (to Risk-Weighted Assets) | 0.136 | 0.142
Tier 1 Capital (to Average Assets) | 0.102 | 0.103
Well Capitalized Regulatory Requirements, Amount |  |
Common Equity Tier 1 Capital (to Risk-Weighted Assets) | $ 1,719,621 | $ 1,645,807
Tier 1 Capital (to Risk-Weighted Assets) | 2,088,111 | 1,998,480
Total Capital (to Risk-Weighted Assets) | 2,579,432 | 2,468,711
Tier 1 Capital (to Average Assets) | $ 1,184,213 | $ 1,185,280
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 -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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