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Regulatory Capital (Tables)
 12 Months Ended
Dec. 31, 2024
Regulatory Assets and Liabilities Disclosure [Abstract]  
Schedule of Compliance with Regulatory Capital Requirements Under Banking Regulations
At December 31, 2024, the adjusted transition amounts that were deferred and are being phased in for regulatory capital purposes are as follows:
Adjusted Transition AmountsPhase-In
Amounts for the Year Ended		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, 2021December 31, 2022December 31, 2023December 31, 2024December 31, 2024
Retained earnings$836,351 $(209,088)$(209,088)$(209,088)$209,087 
Allowance for credit losses1,038,145 (259,536)(259,536)(259,536)259,537 
Liability for unfunded commitments104,377 (26,094)(26,094)(26,095)26,094 
Deferred tax asset306,171 (76,542)(76,542)(76,543)76,544 
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, 2024 and December 31, 2023, the unrealized loss on available-for-sale investments included in other comprehensive income totaled $83 million and $115 million, net of tax of $27 million and $37 million, respectively. The capital ratios would remain above the well capitalized thresholds, including applicable capital conservation buffers, if the unrealized loss became fully recognized into capital.
(Dollars in thousands)Actual
U.S. Basel III
Minimum Requirements Plus Buffer(1)(2)
AmountRatioAmountRatio
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 %
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 %
             
(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, 2024 and 2023, the actual amounts and the actual ratios include the respective adjusted transition amounts discussed above that were phased in at the beginning of 2024 and 2023.