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Regulatory Capital Requirements - Additional Information (Detail)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]        
Capital Conservation Buffer, Percentage of Common equity Tier 1 Capital to Risk-Weighted Assets     2.50%  
Common Equity Tier One Capital to Average Assets to be Well Capitalized     6.50%  
FDIC [Member]        
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]        
Leverage (Tier 1), To be well-capitalized under prompt corrective action provisions, Ratio     5.00%  
Risk-based capital: Tier 1, To be well-capitalized under prompt corrective action provisions, Ratio     8.00%  
Risk-based capital: Total, To be well-capitalized under prompt corrective action provisions, Ratio     10.00%  
Minimum [Member] | Scenario, Forecast [Member]        
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]        
Capital Conservation Buffer, Percentage of Common equity Tier 1 Capital to Risk-Weighted Assets   0.625%    
Maximum [Member] | Scenario, Forecast [Member]        
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]        
Capital Conservation Buffer, Percentage of Common equity Tier 1 Capital to Risk-Weighted Assets 2.50%      
FDIC [Member]        
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]        
Leverage (Tier 1), minimum capital adequacy requirements, Ratio     4.00% 4.00%
Common Equity Tier One Capital to Average Assets for Capital Adequacy     4.50%  
Risk-based capital: Tier 1, minimum capital adequacy requirements, Ratio     6.00% 4.00%
Risk-based capital: Total, minimum capital adequacy requirements, Ratio     8.00% 8.00%
Leverage (Tier 1), To be well-capitalized under prompt corrective action provisions, Ratio     5.00% 5.00%
Common Equity Tier One Capital to Average Assets to be Well Capitalized     6.50%  
Risk-based capital: Tier 1, To be well-capitalized under prompt corrective action provisions, Ratio     8.00% 6.00%
Risk-based capital: Total, To be well-capitalized under prompt corrective action provisions, Ratio     10.00% 10.00%