Regulatory Capital (Tables)

3 Months Ended

Mar. 31, 2023

Banking and Thrift, Other Disclosure [Abstract]

Schedule of Compliance with Regulatory Capital Requirements Under Banking Regulations

At March 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 Three Months Ended		Remaining Adjusted Transition Amounts to be Phased-In
(Dollars in thousands)	December 31, 2021		December 31, 2022		March 31, 2023		March 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 Bank’s required and actual regulatory capital amounts and ratios under U.S. Basel III are shown in the following table. 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 March 31, 2023 and December 31, 2022, the unrealized loss on available-for-sale investments included in other comprehensive income totaled $133 million and $160 million, respectively. The capital ratios would remain above the 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 March 31, 2023(3):
Common Equity Tier 1 Capital (to Risk-Weighted Assets)	$	2,979,433	12.0	%	$	1,738,576	>	7.0	%
Tier 1 Capital (to Risk-Weighted Assets)	$	2,979,433	12.0	%	$	2,111,128	>	8.5	%
Total Capital (to Risk-Weighted Assets)	$	3,297,674	13.3	%	$	2,607,863	>	10.5	%
Tier 1 Capital (to Average Assets)	$	2,979,433	10.0	%	$	1,188,369	>	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 March 31, 2023 and 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 and 2023.