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Regulatory Capital - U.S. Basel III Regulatory Requirements (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Actual Amount |  |
Common Equity Tier 1 Capital (to Risk-Weighted Assets) | $ 3,164,962 | $ 3,579,005
Tier 1 Capital (to Risk-Weighted Assets) | 3,164,962 | 3,579,005
Total Capital (to Risk-Weighted Assets) | 3,230,743 | 3,849,820
Tier 1 Capital (to Average Assets) | $ 3,164,962 | $ 3,579,005
Actual Ratio |  |
Common Equity Tier 1 Capital (to Risk-Weighted Assets) | 13.50% | 14.00%
Tier 1 Capital (to Risk-Weighted Assets) | 0.135 | 0.140
Total Capital (to Risk-Weighted Assets) | 0.138 | 0.150
Tier 1 Capital (to Average Assets) | 0.100 | 0.113
Advanced Approach |  |
U.S. Basel III Regulatory Requirements, Amount |  |
Common Equity Tier 1 Capital (to Risk-Weighted Assets) | $ 1,637,155 | $ 1,794,780
Tier 1 Capital (to Risk-Weighted Assets) | 1,987,974 | 2,179,375
Total Capital (to Risk-Weighted Assets) | 2,455,732 | 2,692,169
Tier 1 Capital (to Average Assets) | $ 1,271,568 | $ 1,264,424
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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