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Regulatory Matters - Additional Information (Detail)
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Increase in risk-based capital ratios   0.625%  
Capital conservation buffer ratio   1.875% 1.25%
Scenario, Forecast [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Minimum capital level requirements, Common equity tier 1 capital ratio 7.00%    
Minimum capital level requirements, Common equity tier 1 capital ratio 8.50%    
Minimum capital level requirements, Total capital ratio 10.50%