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Regulatory Capital (Tables) | 12 Months Ended
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Dec. 31, 2021
Regulatory Assets and Liabilities Disclosure [Abstract] |
Schedule of compliance with regulatory capital requirements | The following capital amounts and ratios are based upon the Bank’s average assets and risk-weighted assets, as indicated.
(Dollars in thousands) |  | Actual |  | U.S. Basel III Minimum Requirements Plus Buffer(1)(2)
|  | Amount | Ratio |  | Amount |  | Ratio
As of December 31, 2021: |  |  |  |  |  |  |
Common Equity Tier 1 Capital (to Risk-Weighted Assets) |  | $ | 3,314,657 |  | 14.1 | % |  | $ | 1,643,132 |  | > | 7.0 | %
Tier 1 Capital (to Risk-Weighted Assets) |  | $ | 3,314,657 |  | 14.1 | % |  | $ | 1,995,232 |  | > | 8.5 | %
Total Capital (to Risk-Weighted Assets) |  | $ | 3,410,183 |  | 14.5 | % |  | $ | 2,464,699 |  | > | 10.5 | %
Tier 1 Capital (to Average Assets) |  | $ | 3,314,657 |  | 11.1 | % |  | $ | 1,198,808 |  | > | 4.0 | %
As of December 31, 2020: |  |  |  |  |  |  |
Common Equity Tier 1 Capital (to Risk-Weighted Assets) |  | $ | 3,579,005 |  | 14.0 | % |  | $ | 1,794,780 |  | > | 7.0 | %
Tier 1 Capital (to Risk-Weighted Assets) |  | $ | 3,579,005 |  | 14.0 | % |  | $ | 2,179,375 |  | > | 8.5 | %
Total Capital (to Risk-Weighted Assets) |  | $ | 3,849,820 |  | 15.0 | % |  | $ | 2,692,169 |  | > | 10.5 | %
Tier 1 Capital (to Average Assets) |  | $ | 3,579,005 |  | 11.3 | % |  | $ | 1,264,424 |  | > | 4.0 | %
(1) Reflects the U.S. Basel III minimum required ratio plus the applicable capital conservation buffer. (2) The Bank’s regulatory capital ratios also exceeded all applicable standards for the Bank to qualify as “well capitalized” under the prompt corrective action framework.

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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826 Reference 2: 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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