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Regulatory Capital (Tables) | 12 Months Ended
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Dec. 31, 2022
Regulatory Assets and Liabilities Disclosure [Abstract] |
Schedule of Compliance with Regulatory Capital Requirements Under Banking Regulations | At December 31, 2022, the adjusted transition amounts that were deferred and are being phased in for regulatory capital purposes are as follows:
|  | Transition Amounts |  | Adjustments for the Year Ended |  | Adjustments for the Year Ended |  | Phase-In Amounts for the Year Ended |  | Remaining Adjusted Transition Amounts to be Phased-In
(Dollars in thousands) |  | January 1, 2020 |  | December 31, 2020 |  | December 31, 2021 |  | December 31, 2022 |  | December 31, 2022
Retained earnings |  | $ | 952,639 |  |  | $ | (57,859) |  |  | $ | (58,429) |  |  | $ | (209,088) |  |  | $ | 627,263 |
Allowance for credit losses |  | 1,143,053 |  |  | (55,811) |  |  | (49,097) |  |  | (259,536) |  |  | 778,609 |
Liability for unfunded commitments |  | 115,758 |  |  | (2,048) |  |  | (9,333) |  |  | (26,094) |  |  | 78,283 |
Deferred tax asset |  | 306,171 |  |  | — |  |  | — |  |  | (76,542) |  |  | 229,629 |
(Dollars in thousands) |  | Actual |  | U.S. Basel III Minimum Requirements Plus Buffer(1)(2)
|  | Amount | Ratio |  | Amount |  | Ratio
As of December 31, 2022(3): |  |  |  |  |  |  |
Common Equity Tier 1 Capital (to Risk-Weighted Assets) |  | $ | 3,040,662 |  | 12.9 | % |  | $ | 1,645,807 |  | > | 7.0 | %
Tier 1 Capital (to Risk-Weighted Assets) |  | $ | 3,040,662 |  | 12.9 | % |  | $ | 1,998,480 |  | > | 8.5 | %
Total Capital (to Risk-Weighted Assets) |  | $ | 3,338,645 |  | 14.2 | % |  | $ | 2,468,711 |  | > | 10.5 | %
Tier 1 Capital (to Average Assets) |  | $ | 3,040,662 |  | 10.3 | % |  | $ | 1,185,280 |  | > | 4.0 | %
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 | %
(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 December 31, 2022, the actual amounts and the actual ratios include the adjusted transition amounts discussed above that were phased in at the beginning of 2022.

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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 https://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 https://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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