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Regulatory Capital (Tables)
 9 Months Ended
Sep. 30, 2022
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]  
Schedule of Compliance with Regulatory Capital Requirements
The following table includes the Basel III requirements for regulatory capital ratios.
Basel III MinimumsBasel III Conservation BuffersBasel III Requirements
Regulatory capital ratios
Total risk-based capital8.00 %2.50 %10.50 %
Tier 1 risk-based capital6.00 2.50 8.50 
Common equity Tier 14.50 2.50 7.00 
Tier 1 leverage4.00 — 4.00 
The regulatory capital ratios for BancShares and FCB exceed the Basel III requirements and the PCA well-capitalized thresholds as of September 30, 2022 and December 31, 2021 as summarized in the following table.
dollars in millionsSeptember 30, 2022December 31, 2021
Basel III RequirementsPCA well-capitalized thresholdsAmountRatioAmountRatio
BancShares
Total risk-based capital10.50 %10.00 %$11,927 13.46 %$5,042 14.35 %
Tier 1 risk-based capital8.50 8.00 10,066 11.36 4,380 12.47 
Common equity Tier 17.00 6.50 9,185 10.37 4,041 11.50 
Tier 1 leverage4.00 5.00 10,066 9.31 4,380 7.59 
FCB
Total risk-based capital10.50 %10.00 %$11,732 13.26 %$4,858 13.85 %
Tier 1 risk-based capital8.50 8.00 10,327 11.67 4,651 13.26 
Common equity Tier 17.00 6.50 10,327 11.67 4,651 13.26 
Tier 1 leverage4.00 5.00 10,327 9.56 4,651 8.07