Regulatory Capital (Tables)

12 Months Ended

Dec. 31, 2022

Regulatory Assets and Liabilities Disclosure [Abstract]

Schedule of Compliance with Regulatory Capital Requirements Under Banking Regulations

At December 31, 2022, the adjusted transition amounts that were deferred and are being phased in for regulatory capital purposes are as follows:

	Transition Amounts		Adjustments for the Year Ended		Adjustments for the Year Ended		Phase-In Amounts for the Year Ended		Remaining Adjusted Transition Amounts to be Phased-In
(Dollars in thousands)	January 1, 2020		December 31, 2020		December 31, 2021		December 31, 2022		December 31, 2022
Retained earnings	$	952,639	$	(57,859)	$	(58,429)	$	(209,088)	$	627,263
Allowance for credit losses	1,143,053		(55,811)		(49,097)		(259,536)		778,609
Liability for unfunded commitments	115,758		(2,048)		(9,333)		(26,094)		78,283
Deferred tax asset	306,171		—		—		(76,542)		229,629

(Dollars in thousands)	Actual				U.S. Basel III Minimum Requirements Plus Buffer(1)(2)
	Amount		Ratio		Amount			Ratio
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	%
As of December 31, 2021:
Common Equity Tier 1 Capital (to Risk-Weighted Assets)	$	3,314,657	14.1	%	$	1,643,132	>	7.0	%
Tier 1 Capital (to Risk-Weighted Assets)	$	3,314,657	14.1	%	$	1,995,232	>	8.5	%
Total Capital (to Risk-Weighted Assets)	$	3,410,183	14.5	%	$	2,464,699	>	10.5	%
Tier 1 Capital (to Average Assets)	$	3,314,657	11.1	%	$	1,198,808	>	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 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.