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Regulatory Capital (Tables)
 12 Months Ended
Dec. 31, 2023
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 December 31, 2023 and 2022 as summarized in the following table.
dollars in millionsDecember 31, 2023December 31, 2022
Basel III RequirementsPCA well capitalized thresholdsAmountRatioAmountRatio
BancShares
Total risk-based capital10.50 %10.00 %$23,891 15.75 %$11,799 13.18 %
Tier 1 risk-based capital8.50 8.00 21,150 13.94 9,902 11.06 
Common equity Tier 17.00 6.50 20,270 13.36 9,021 10.08 
Tier 1 leverage4.00 5.00 21,150 9.83 9,902 8.99 
FCB
Total risk-based capital10.50 %10.00 %$23,600 15.56 %$11,627 12.99 %
Tier 1 risk-based capital8.50 8.00 21,227 13.99 10,186 11.38 
Common equity Tier 17.00 6.50 21,227 13.99 10,186 11.38 
Tier 1 leverage4.00 5.00 21,227 9.88 10,186 9.25