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Acquisitions - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 18, 2016
Jun. 01, 2016
Jul. 01, 2015
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Jul. 15, 2016
Business Acquisition [Line Items]                
Common stock, shares outstanding         12,571,534   11,939,887  
Acquisition of goodwill         $ 56,458,000   $ 49,600,000  
Subsequent Event [Member] | Pro Forma [Member] | Horizon [Member]                
Business Acquisition [Line Items]                
Reported total assets of acquiree               $ 3,500,000,000
Total deposits held by acquiree               2,500,000,000
Total loans of acquiree               $ 2,200,000,000
Kosciusko Financial Inc [Member]                
Business Acquisition [Line Items]                
Exchange ratio per share   301.22%            
Common stock issued   582,287            
Market closing price per share   $ 24.85            
Total estimated purchase price   $ 22,581,000            
Costs related to the acquisition   1,600,000            
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            
Net intangible assets acquired   1,867,000            
Acquisition of goodwill   6,858,000            
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            
Reported total assets of acquiree   155,413,000            
Total deposits held by acquiree   $ 132,832,000            
Kosciusko Financial Inc [Member] | Maximum [Member]                
Business Acquisition [Line Items]                
Share of common stock outstanding per share   $ 81.75            
Number of shares owned   100            
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  
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          
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      
Operating revenue, net of tax       $ 657,000   $ 657,000    
Non-recurring expense, net of tax       $ 95,000   $ 95,000    
Reported total assets of acquiree     485,077,000          
Total deposits held by acquiree     $ 406,930,000          
Peoples Bancorp Inc [Member] | Maximum [Member]                
Business Acquisition [Line Items]                
Share of common stock outstanding per share     $ 33.14          
Number of shares owned     100          
LaPorte Bancorp Inc [Member] | Subsequent Event [Member]                
Business Acquisition [Line Items]                
Exchange ratio per share 62.90%              
Common stock issued 2,280,992              
Market closing price per share $ 27.54              
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 $ 101,700,000              
Reported total assets of acquiree 536,000,000              
Total deposits held by acquiree 370,900,000              
Total loans of acquiree $ 316,800,000              
LaPorte Bancorp Inc [Member] | Maximum [Member] | Subsequent Event [Member]                
Business Acquisition [Line Items]                
Share of common stock outstanding per share $ 17.50              
Number of shares owned 100