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Acquisitions - Additional Information (Detail) - USD ($)
 9 Months Ended 12 Months Ended
Jul. 18, 2016
Jun. 01, 2016
Jul. 01, 2015
Sep. 30, 2016
Dec. 31, 2015
Aug. 31, 2016
Business Acquisition [Line Items]            
Common stock, shares outstanding       22,143,228 17,992,986  
Acquisition of goodwill       $ 74,308,000 $ 49,600,000  
Peoples Bancorp Inc [Member]            
Business Acquisition [Line Items]            
Exchange ratio per share     142.50%      
Share of common stock outstanding per share     $ 9.75      
Common stock, shares outstanding     2,311,858      
Common stock issued       3,288,303    
Market closing price per share     $ 16.88      
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      
Peoples Bancorp Inc [Member] | Maximum [Member]            
Business Acquisition [Line Items]            
Share of common stock outstanding per share     $ 33.14      
Number of shares owned     100      
Kosciusko Financial Inc [Member]            
Business Acquisition [Line Items]            
Exchange ratio per share   451.83%        
Common stock issued   873,430        
Market closing price per share   $ 16.57        
Total estimated purchase price   $ 22,983,000        
Costs related to the acquisition   1,600,000        
Net intangible assets acquired   526,000        
Acquisition of goodwill   6,443,000   $ 6,400,000   $ 6,900,000
Purchase price of the business assets, portion deductible   $ 0        
Core deposit intangible amortization period       7 years    
Cash paid for each share   $ 81.75        
Business combination stock transferred, percentage of consideration   65.00%        
Business combination cash transferred, percentage of consideration   35.00%        
Estimated transaction value   $ 23,000,000        
Kosciusko Financial Inc [Member] | Maximum [Member]            
Business Acquisition [Line Items]            
Share of common stock outstanding per share   $ 81.75        
Number of shares owned   100        
LaPorte Bancorp Inc [Member]            
Business Acquisition [Line Items]            
Exchange ratio per share 94.35%          
Common stock issued 3,421,488          
Market closing price per share $ 18.36          
Total estimated purchase price $ 98,634,000          
Net intangible assets acquired 2,514,000          
Acquisition of goodwill 18,265,000          
Purchase price of the business assets, portion deductible $ 0          
Core deposit intangible amortization period       7 years    
Cash paid for each share $ 17.50          
Business combination stock transferred, percentage of consideration 65.00%          
Business combination cash transferred, percentage of consideration 35.00%          
Estimated transaction value $ 98,600,000