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Fair Value Measurements - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Non recurring fair value adjustments on loans held for sale $ 0 $ 0
Period of maturity as classifies as short-term borrowings 90 days  
Fair value of loan commitments and standby letters of credit $ 0 $ 0
Maximum [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Period under consideration for valuation of real estate collateral 12 months  
Period under consideration for valuation of business equipment 1 year  
Minimum [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Period under consideration for valuation of house or building in the process of construction 1 year