Regulatory Capital (Tables)

9 Months Ended

Sep. 30, 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 September 30, 2025(3):
Common Equity Tier 1 Capital (to Risk-Weighted Assets)	$	3,063,308	11.3	%	$	1,902,074	>	7.0	%
Tier 1 Capital (to Risk-Weighted Assets)	$	3,063,308	11.3	%	$	2,309,661	>	8.5	%
Total Capital (to Risk-Weighted Assets)	$	3,418,923	12.6	%	$	2,853,110	>	10.5	%
Tier 1 Capital (to Average Assets)	$	3,063,308	10.4	%	$	1,177,879	>	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 September 30, 2025 and December 31, 2024, the actual amounts and the actual ratios include the fully phased in adjusted transition amounts discussed above.