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Regulatory Capital Requirements and Dividends From Subsidiaries - Basel III Requirements and the PCA well-capitalized Thresholds (Details)
$ in Thousands
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
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  
BancShares    
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 $ 5,041,686 $ 4,577,212
Tier 1 risk-based capital, amount 4,380,452 3,856,086
Common equity Tier 1, amount 4,040,515 3,516,149
Tier 1 leverage, amount $ 4,380,452 $ 3,856,086
Total risk-based capital, Ratio 0.1435 0.1381
Tier 1 risk-based capital, Ratio 0.1247 0.1163
Common equity Tier 1, Ratio 0.1150 0.1061
Tier 1 leverage, Ratio 0.0759 0.0786
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 $ 4,857,960 $ 4,543,496
Tier 1 risk-based capital, amount 4,651,226 4,276,870
Common equity Tier 1, amount 4,651,226 4,276,870
Tier 1 leverage, amount $ 4,651,226 $ 4,276,870
Total risk-based capital, Ratio 0.1385 0.1372
Tier 1 risk-based capital, Ratio 0.1326 0.1292
Common equity Tier 1, Ratio 0.1326 0.1292
Tier 1 leverage, Ratio 0.0807 0.0872