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Acquisitions - Additional Information (Detail) - USD ($)
 9 Months Ended
Jul. 01, 2015
Sep. 30, 2015
Dec. 31, 2014
Apr. 03, 2014
Business Acquisition [Line Items]        
Common stock, shares outstanding   11,931,987 9,213,036  
Acquisition of goodwill   $ 49,600,000 $ 28,176,000  
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      
Transaction value is estimated $ 78,100,000      
Costs related to the acquisition   $ 4,400,000    
Net tangible assets acquired 78,100,000      
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 229,100,000      
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   $ 1,300,000    
Non-recurring expense, net of tax   $ 3,000,000    
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
Transaction value is estimated       $ 18,900,000
Costs related to the acquisition   $ 1,300,000    
Net tangible assets acquired       19,900,000
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