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Regulatory Capital (Tables)
 6 Months Ended
Jun. 30, 2022
Banking and Thrift, Other Disclosure [Abstract]  
Schedule of Compliance with Regulatory Capital Requirements Under Banking Regulations
At June 30, 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
Six Months Ended		Adjusted Transition Amounts
(Dollars in thousands)January 1, 2020December 31, 2020December 31, 2021June 30, 2022June 30, 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 June 30, 2022(3):
Common Equity Tier 1 Capital (to Risk-Weighted Assets)$3,236,740 14.3 %$1,579,060 >7.0 %
Tier 1 Capital (to Risk-Weighted Assets)$3,236,740 14.3 %$1,917,430 >8.5 %
Total Capital (to Risk-Weighted Assets)$3,519,403 15.6 %$2,368,590 >10.5 %
Tier 1 Capital (to Average Assets)$3,236,740 11.2 %

$1,153,540 >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 June 30, 2022, the actual amounts and the actual ratios include the adjusted transition amounts discussed above that were phased in at the beginning of 2022.