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Regulatory Capital (Tables) | 12 Months Ended
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Dec. 31, 2023
Regulatory Assets and Liabilities Disclosure [Abstract] |
Schedule of Compliance with Regulatory Capital Requirements Under Banking Regulations | At December 31, 2023, the adjusted transition amounts that were deferred and are being phased in for regulatory capital purposes are as follows:
|  | Adjusted Transition Amounts |  | Phase-In Amounts for the Year Ended |  | Phase-In Amounts for the Year Ended |  | Remaining Adjusted Transition Amounts to be Phased-In
(Dollars in thousands) |  | December 31, 2021 |  | December 31, 2022 |  | December 31, 2023 |  | December 31, 2023
Retained earnings |  | $ | 836,351 |  |  | $ | (209,088) |  |  | $ | (209,088) |  |  | $ | 418,175 |
Allowance for credit losses |  | 1,038,145 |  |  | (259,536) |  |  | (259,536) |  |  | 519,073 |
Liability for unfunded commitments |  | 104,377 |  |  | (26,094) |  |  | (26,094) |  |  | 52,189 |
Deferred tax asset |  | 306,171 |  |  | (76,542) |  |  | (76,542) |  |  | 153,087 |
The following capital amounts and ratios are based upon the Bank’s average assets and risk-weighted assets, as indicated. The Bank has elected to exclude accumulated other comprehensive income related to both available-for-sale investments and swap valuations from Common Equity Tier 1 Capital. At December 31, 2023 and December 31, 2022, the unrealized loss on available-for-sale investments included in other comprehensive income totaled $115 million and $160 million, net of tax of $37 million and $52 million, respectively. The capital ratios would remain above the U.S. Basel III well capitalized thresholds if the unrealized loss became fully recognized into capital.
(Dollars in thousands) |  | Actual |  | U.S. Basel III Minimum Requirements Plus Buffer(1)(2)
|  | Amount | Ratio |  | Amount |  | Ratio
As of December 31, 2023(3): |  |  |  |  |  |  |
Common Equity Tier 1 Capital (to Risk-Weighted Assets) |  | $ | 3,019,973 |  | 12.3 | % |  | $ | 1,719,621 |  | > | 7.0 | %
Tier 1 Capital (to Risk-Weighted Assets) |  | $ | 3,019,973 |  | 12.3 | % |  | $ | 2,088,111 |  | > | 8.5 | %
Total Capital (to Risk-Weighted Assets) |  | $ | 3,334,140 |  | 13.6 | % |  | $ | 2,579,432 |  | > | 10.5 | %
Tier 1 Capital (to Average Assets) |  | $ | 3,019,973 |  | 10.2 | % |  | $ | 1,184,213 |  | > | 4.0 | %
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 | %
(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 December 31, 2023 and 2022, the actual amounts and the actual ratios include the respective adjusted transition amounts discussed above that were phased in at the beginning of 2023 and 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 -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480696/942-505-50-1 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//1943274/2147480696/942-505-50-1B + Details
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