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Business Combinations - Additional Information (Detail)
Mar. 18, 2016
USD ($)
Branches
Sep. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Business Acquisition [Line Items]      
Goodwill recognized   $ 64,311,000 $ 63,462,000
Bank of America [Member]      
Business Acquisition [Line Items]      
Number of branches | Branches 3    
Acquisition, completion date Oct. 28, 2015    
Cash consideration $ 3,204,000    
Deposits 161,231,000    
Loans 289,000    
Cash 159,520,000    
Goodwill recognized 849,000    
Increase in net book value of land and buildings acquired 309,000    
Recognized intangible related to acquisition 2,046,000    
Bank of America [Member] | Core Deposit Intangibles [Member]      
Business Acquisition [Line Items]      
Recognized intangible related to acquisition $ 2,046,000    
Percentage of acquired intangibles 1.50%    
Finite lived intangible asset estimated useful life 7 years