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Summary of Significant Accounting Policies (Detail)
 9 Months Ended 12 Months Ended
Sep. 30, 2016
shares
Sep. 30, 2015
USD ($)
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
USD ($)
shares
Number of Branches     10    
Goodwill, Impairment Loss     $ 0 $ 0 $ 0
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options     $ 0    
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures (in Shares) | shares 360,815        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in Shares) | shares 0 1,025 2,175 11,223  
Payments for Stock Options Exercised   $ (6,000) $ 7,000 $ 50,000 77,000
Employee Stock Option [Member]          
Allocated Share-based Compensation Expense     $ 0 $ 0 $ 0
Restricted Stock [Member]          
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures (in Shares) | shares     585 0 0
Core Deposits [Member]          
Finite-Lived Intangible Asset, Useful Life     10 years    
Minimum [Member] | Furniture, Fixtures, and Equipment [Member]          
Property, Plant and Equipment, Useful Life     3 years    
Minimum [Member] | Building and Building Improvements [Member]          
Property, Plant and Equipment, Useful Life     3 years    
Maximum [Member] | Furniture, Fixtures, and Equipment [Member]          
Property, Plant and Equipment, Useful Life     20 years    
Maximum [Member] | Building and Building Improvements [Member]          
Property, Plant and Equipment, Useful Life     40 years