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Acquisition - Additional Information (Detail) - USD ($)
 12 Months Ended
Jul. 01, 2015
Dec. 31, 2015
Dec. 31, 2014
Apr. 03, 2014
Dec. 31, 2013
Business Acquisition [Line Items]          
Common stock, shares outstanding   11,939,887 9,213,036    
Acquisition of goodwill   $ 49,600,000 $ 28,176,000   $ 19,748,000
Peoples Bancorp Inc [Member]          
Business Acquisition [Line Items]          
Exchange ratio per share 95.00%        
Share of common stock outstanding per share $ 9.75        
Common stock, shares outstanding 2,311,858        
Common stock issued   2,192,202      
Market closing price per share $ 25.32        
Total estimated purchase price $ 78,147,000        
Costs related to the acquisition   $ 4,900,000      
Net intangible assets acquired 4,394,000        
Acquisition of goodwill 21,424,000        
Purchase price of the business assets, portion deductible 0        
Core deposit intangible amortization period   7 years      
Loan portfolio acquired 228,600,000        
Discount on loan portfolio acquired 4,800,000        
Performing portion of the loan portfolio acquired 223,400,000        
Estimated fair value of performing portion of the loan portfolio $ 220,000,000        
Operating revenue, net of tax   $ 2,300,000      
Non-recurring expense, net of tax   $ 3,300,000      
Peoples Bancorp Inc [Member] | Maximum [Member]          
Business Acquisition [Line Items]          
Share of common stock outstanding per share $ 33.14        
Number of shares owned 100        
Summit [Member]          
Business Acquisition [Line Items]          
Exchange ratio per share       49.04%  
Share of common stock outstanding per share       $ 5.15  
Common stock, shares outstanding       1,164,442  
Common stock issued   570,820      
Market closing price per share       $ 22.23  
Total estimated purchase price       $ 18,900,000  
Costs related to the acquisition     $ 1,300,000    
Net intangible assets acquired       822,000  
Acquisition of goodwill       8,428,000  
Purchase price of the business assets, portion deductible       4,400,000  
Core deposit intangible amortization period   7 years      
Loan portfolio acquired       130,500,000  
Discount on loan portfolio acquired       6,400,000  
Performing portion of the loan portfolio acquired       106,200,000  
Estimated fair value of performing portion of the loan portfolio       104,600,000  
Date of acquisition agreement   Apr. 03, 2014      
Net tangible assets acquired       $ 19,900,000