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Regulatory Capital - U.S. Basel III Regulatory Requirements (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Actual Amount |  |
Common Equity Tier 1 Capital (to Risk-Weighted Assets) | $ 3,230,078 | $ 3,264,309
Tier 1 Capital (to Risk-Weighted Assets) | 3,230,078 | 3,264,309
Total Capital (to Risk-Weighted Assets) | 3,551,765 | 3,600,668
Tier 1 Capital (to Average Assets) | $ 3,230,078 | $ 3,264,309
Actual Ratio |  |
Common Equity Tier 1 Capital (to Risk-Weighted Assets) | 12.70% | 12.20%
Tier 1 Capital (to Risk-Weighted Assets) | 0.127 | 0.122
Total Capital (to Risk-Weighted Assets) | 0.139 | 0.134
Tier 1 Capital (to Average Assets) | 0.102 | 0.102
Advanced Approach |  |
U.S. Basel III Regulatory Requirements, Amount |  |
Common Equity Tier 1 Capital (to Risk-Weighted Assets) | $ 1,785,181 | $ 1,876,050
Tier 1 Capital (to Risk-Weighted Assets) | 2,167,720 | 2,278,060
Total Capital (to Risk-Weighted Assets) | 2,677,771 | 2,814,074
Tier 1 Capital (to Average Assets) | $ 1,261,080 | $ 1,282,642
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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