Regulatory Capital (Tables)

12 Months Ended

Dec. 31, 2021

Regulatory Assets and Liabilities Disclosure [Abstract]

Schedule of compliance with regulatory capital requirements

The following capital amounts and ratios are based upon the Bank’s average assets and risk-weighted assets, as indicated.

(Dollars in thousands)	Actual				U.S. Basel III Minimum Requirements Plus Buffer(1)(2)
	Amount		Ratio		Amount			Ratio
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	%
As of December 31, 2020:
Common Equity Tier 1 Capital (to Risk-Weighted Assets)	$	3,579,005	14.0	%	$	1,794,780	>	7.0	%
Tier 1 Capital (to Risk-Weighted Assets)	$	3,579,005	14.0	%	$	2,179,375	>	8.5	%
Total Capital (to Risk-Weighted Assets)	$	3,849,820	15.0	%	$	2,692,169	>	10.5	%
Tier 1 Capital (to Average Assets)	$	3,579,005	11.3	%	$	1,264,424	>	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.