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Regulatory Capital (Tables)
3 Months Ended
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)
AmountRatioAmountRatio
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.