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Regulatory Capital (Tables)
 3 Months Ended
Mar. 31, 2022
Banking and Thrift, Other Disclosures [Abstract]  
Schedule of Compliance with Regulatory Capital Requirements Under Banking Regulations
At March 31, 2022, the adjusted transition amounts, reflecting changes over the phase-in period, that will be deferred for regulatory capital purposes are as follows:
Transition AmountsAdjustments for the Year EndedAdjustments for the Year EndedAdjustments
 for the
Three Months Ended		Adjusted Transition Amounts
(Dollars in thousands)January 1, 2020December 31, 2020December 31, 2021March 31, 2022March 31, 2022
Retained earnings$952,639 $(57,859)$(58,429)$(209,088)$627,263 
Allowance for credit losses1,143,053 (55,811)(49,097)(259,536)778,609 
Liability for unfunded commitments115,758 (2,048)(9,333)(26,094)78,283 
Deferred tax asset306,171 — — (76,542)229,629 
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)
AmountRatioAmountRatio
As of March 31, 2022(3):
Common Equity Tier 1 Capital (to Risk-Weighted Assets)$3,155,469 12.9 %$1,710,526 >7.0 %
Tier 1 Capital (to Risk-Weighted Assets)$3,155,469 12.9 %$2,077,067 >8.5 %
Total Capital (to Risk-Weighted Assets)$3,462,126 14.2 %$2,565,789 >10.5 %
Tier 1 Capital (to Average Assets)$3,155,469 10.5 %

$1,199,485 >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 March 31, 2022, the actual amounts and the actual ratios include the adjusted transition amounts discussed above.