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Regulatory Capital - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2015
Jan. 01, 2019
Capital Conservation Buffer, Phase in Amount    
Capital Conservation Buffer, Phase in Amount 0.625%  
Capital Conservation Buffer, Phase-in, Number of years 4 years  
Scenario, Forecast [Member]    
Capital Conservation Buffer, Phase in Amount    
Capital Conservation Buffer, Maximum Percentage   2.50%