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Regulatory Capital (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 2022 and December 31, 2021 as summarized in the following table.
March 31, 2022December 31, 2021
dollars in millionsBasel III RequirementsPCA well-capitalized thresholdsAmountRatioAmountRatio
BancShares
Total risk-based capital10.50 %10.00 %$12,117 14.47 %$5,042 14.35 %
Tier 1 risk-based capital8.50 8.00 10,377 12.39 4,380 12.47 
Common equity Tier 17.00 6.50 9,496 11.34 4,041 11.50 
Tier 1 leverage4.00 5.00 10,377 9.55 4,380 7.59 
FCB
Total risk-based capital10.50 %10.00 %$11,925 14.25 %$4,858 13.85 %
Tier 1 risk-based capital8.50 8.00 10,641 12.71 4,651 13.26 
Common equity Tier 17.00 6.50 10,641 12.71 4,651 13.26 
Tier 1 leverage4.00 5.00 10,641 9.81 4,651 8.07