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REGULATORY CAPITAL - Schedule of Basel III Requirements and the PCA well-capitalized Thresholds (Details)
$ in Millions
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
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 $ 24,610 $ 23,891
Tier 1 risk-based capital, amount 22,137 21,150
Common equity Tier 1, amount 21,256 20,270
Tier 1 leverage, amount $ 22,137 $ 21,150
Total risk-based capital, Ratio 0.1504 0.1575
Tier 1 risk-based capital, Ratio 0.1353 0.1394
Common equity Tier 1, Ratio 0.1299 0.1336
Tier 1 leverage, Ratio 0.0990 0.0983
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 $ 23,975 $ 23,600
Tier 1 risk-based capital, amount 21,852 21,227
Common equity Tier 1, amount 21,852 21,227
Tier 1 leverage, amount $ 21,852 $ 21,227
Total risk-based capital, Ratio 0.1466 0.1556
Tier 1 risk-based capital, Ratio 0.1337 0.1399
Common equity Tier 1, Ratio 0.1337 0.1399
Tier 1 leverage, Ratio 0.0978 0.0988