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Stockholders' Equity - Additional Information (Detail) - USD ($)
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Stockholders Equity [Line Items]    
Increase remaining shares to be purchased 150,000 194,723
2016 [Member]    
Stockholders Equity [Line Items]    
Implementation of the capital conservation buffer, Percentage 0.625%  
Capital conservation buffer implementation phase-in period 4 years  
2019 [Member]    
Stockholders Equity [Line Items]    
Capital Conservation Buffer Maximum Level 2.50%  
Maximum [Member]    
Stockholders Equity [Line Items]    
Quantitative limit for trust preferred securities to be included in tier 1 capital $ 15,000,000,000