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Regulatory Capital - Schedule of Basel III Requirements and the PCA well-capitalized Thresholds (Details)
$ in Millions
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Basel III Requirements, Total risk-based capital 0.1050  
Basel III Requirements, Tier 1 risk-based capital 0.0850  
Basel III Requirements, Common equity Tier 1 0.0700  
Basel III Requirements, Tier 1 leverage 0.0400  
PCA well-capitalized thresholds, Total risk-based capital 0.1000  
PCA well-capitalized thresholds, Tier 1 risk-based capital 0.0800  
PCA well-capitalized thresholds, Common equity Tier 1 0.0650  
PCA well-capitalized thresholds, Tier 1 leverage 0.0500  
Total risk-based capital, amount $ 21,764 $ 11,799
Tier 1 risk-based capital, amount 19,225 9,902
Common equity Tier 1, amount 18,344 9,021
Tier 1 leverage, amount $ 19,225 $ 9,902
Total risk-based capital, Ratio 0.1486 0.1318
Tier 1 risk-based capital, Ratio 0.1313 0.1106
Common equity Tier 1, Ratio 0.1253 0.1008
Tier 1 leverage, Ratio 0.1672 0.0899
FCB    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Basel III Requirements, Total risk-based capital 0.1050  
Basel III Requirements, Tier 1 risk-based capital 0.0850  
Basel III Requirements, Common equity Tier 1 0.0700  
Basel III Requirements, Tier 1 leverage 0.0400  
PCA well-capitalized thresholds, Total risk-based capital 0.1000  
PCA well-capitalized thresholds, Tier 1 risk-based capital 0.0800  
PCA well-capitalized thresholds, Common equity Tier 1 0.0650  
PCA well-capitalized thresholds, Tier 1 leverage 0.0500  
Total risk-based capital, amount $ 21,578 $ 11,627
Tier 1 risk-based capital, amount 19,495 10,186
Common equity Tier 1, amount 19,495 10,186
Tier 1 leverage, amount $ 19,495 $ 10,186
Total risk-based capital, Ratio 0.1474 0.1299
Tier 1 risk-based capital, Ratio 0.1332 0.1138
Common equity Tier 1, Ratio 0.1332 0.1138
Tier 1 leverage, Ratio 0.1697 0.0925