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Acquisitions - Additional Information (Detail) - USD ($)
 6 Months Ended
Jul. 01, 2015
Jun. 30, 2015
Dec. 31, 2014
Apr. 03, 2014
Business Acquisition [Line Items]        
Common stock outstanding   9,256,026 9,213,036  
Total assets   $ 2,219,307,000 $ 2,076,922,000  
Total deposits   1,584,723,000 1,482,319,000  
Total net loans   1,502,862,000 1,362,053,000  
Net intangible assets acquired       $ 822,000
Acquisition of goodwill   $ 28,176,000 $ 28,176,000 8,428,000
Purchase price of the business assets       $ 2,548,000
Summit [Member]        
Business Acquisition [Line Items]        
Exchange ratio per share       49.04%
Share of common stock outstanding per share       $ 5.15
Common stock outstanding       1,164,442
Common stock issued   570,820    
Market closing price per share       $ 22.23
Costs related to the acquisition   $ 1,300,000    
Date of acquisition agreement   Apr. 03, 2014    
Transaction value is estimated       $ 18,900,000
Net tangible assets acquired       19,900,000
Net intangible assets acquired       822,000
Acquisition of goodwill       8,400,000
Purchase price of the business assets       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
Peoples Bancorp Inc [Member]        
Business Acquisition [Line Items]        
Common stock issued   2,192,202    
Costs related to the acquisition   $ 78,100,000    
Peoples Bancorp Inc [Member] | Subsequent Event [Member]        
Business Acquisition [Line Items]        
Exchange ratio per share 95.00%      
Share of common stock outstanding per share $ 9.75      
Common stock outstanding 2,311,858      
Market closing price per share $ 25.32      
Total assets $ 462,700,000      
Total deposits 350,600,000      
Total net loans $ 226,600,000      
Peoples Bancorp Inc [Member] | Subsequent Event [Member] | Maximum [Member]        
Business Acquisition [Line Items]        
Share of common stock outstanding per share $ 33.14      
Number of shares owned 100      
Horizon Bank [Member] | Pro Forma [Member]        
Business Acquisition [Line Items]        
Total assets   2,700,000,000    
Total deposits   1,900,000,000    
Total net loans   $ 1,700,000,000