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Regulatory Capital (Tables) | 3 Months Ended
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Mar. 31, 2025
Banking and Thrift, Other Disclosure [Abstract] |
Schedule of Compliance with Regulatory Capital Requirements Under Banking Regulations |
(Dollars in thousands) |  | Actual |  | U.S. Basel III Minimum Requirements Plus Buffer(1)(2)
| Amount | Ratio |  | Amount |  | Ratio
As of March 31, 2025(3): |  |  |  |  |  |  |
Common Equity Tier 1 Capital (to Risk-Weighted Assets) |  | $ | 2,992,368 |  | 11.6 | % |  | $ | 1,808,123 |  | > | 7.0 | %
Tier 1 Capital (to Risk-Weighted Assets) |  | $ | 2,992,368 |  | 11.6 | % |  | $ | 2,195,578 |  | > | 8.5 | %
Total Capital (to Risk-Weighted Assets) |  | $ | 3,329,485 |  | 12.9 | % |  | $ | 2,712,184 |  | > | 10.5 | %
Tier 1 Capital (to Average Assets) |  | $ | 2,992,368 |  | 10.1 | % |  | $ | 1,185,745 |  | > | 4.0 | %
As of December 31, 2024(3): |  |  |  |  |  |  |
Common Equity Tier 1 Capital (to Risk-Weighted Assets) |  | $ | 2,957,067 |  | 11.3 | % |  | $ | 1,827,318 |  | > | 7.0 | %
Tier 1 Capital (to Risk-Weighted Assets) |  | $ | 2,957,067 |  | 11.3 | % |  | $ | 2,218,886 |  | > | 8.5 | %
Total Capital (to Risk-Weighted Assets) |  | $ | 3,294,663 |  | 12.6 | % |  | $ | 2,740,976 |  | > | 10.5 | %
Tier 1 Capital (to Average Assets) |  | $ | 2,957,067 |  | 9.7 | % |  | $ | 1,213,505 |  | > | 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. (3) For both March 31, 2025 and December 31, 2024, the actual amounts and the actual ratios include the fully phased in adjusted transition amounts discussed above.

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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 -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1B + Details
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