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Regulatory Capital - U.S. Basel III Regulatory Requirements (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Actual Amount |  |
Common Equity Tier 1 Capital (to Risk-Weighted Assets) | $ 3,255,466 | $ 3,579,005
Tier 1 Capital (to Risk-Weighted Assets) | 3,255,466 | 3,579,005
Total Capital (to Risk-Weighted Assets) | 3,408,359 | 3,849,820
Tier 1 Capital (to Average Assets) | $ 3,255,466 | $ 3,579,005
Actual Ratio |  |
Common Equity Tier 1 Capital (to Risk-Weighted Assets) | 13.10% | 14.00%
Tier 1 Capital (to Risk-Weighted Assets) | 0.131 | 0.140
Total Capital (to Risk-Weighted Assets) | 0.137 | 0.150
Tier 1 Capital (to Average Assets) | 0.109 | 0.113
Advanced Approach |  |
U.S. Basel III Regulatory Requirements, Amount |  |
Common Equity Tier 1 Capital (to Risk-Weighted Assets) | $ 1,736,176 | $ 1,794,780
Tier 1 Capital (to Risk-Weighted Assets) | 2,108,214 | 2,179,375
Total Capital (to Risk-Weighted Assets) | 2,604,265 | 2,692,169
Tier 1 Capital (to Average Assets) | $ 1,193,100 | $ 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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- 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 http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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