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REGULATORY CAPITAL - Schedule of Basel III Requirements and the PCA well-capitalized Thresholds (Details)
$ in Millions
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
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 $ 24,945 $ 24,610
Tier 1 risk-based capital, amount 21,660 22,137
Common equity Tier 1, amount 20,285 21,256
Tier 1 leverage, amount $ 21,660 $ 22,137
Total risk-based capital, Ratio 0.1371 0.1504
Tier 1 risk-based capital, Ratio 0.1191 0.1353
Common equity Tier 1, Ratio 0.1115 0.1299
Tier 1 leverage, Ratio 0.0929 0.0990
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 $ 24,739 $ 23,975
Tier 1 risk-based capital, amount 22,796 21,852
Common equity Tier 1, amount 22,796 21,852
Tier 1 leverage, amount $ 22,796 $ 21,852
Total risk-based capital, Ratio 0.1362 0.1466
Tier 1 risk-based capital, Ratio 0.1255 0.1337
Common equity Tier 1, Ratio 0.1255 0.1337
Tier 1 leverage, Ratio 0.0979 0.0978