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Acquisitions - Additional Information (Detail) - USD ($)
 6 Months Ended
Feb. 03, 2017
Jul. 18, 2016
Jun. 01, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Nov. 07, 2016
Sep. 30, 2016
Aug. 31, 2016
Business Acquisition [Line Items]                  
Acquisition of goodwill       $ 77,644,000   $ 76,941,000      
Kosciusko Financial Inc [Member]                  
Business Acquisition [Line Items]                  
Exchange ratio per share     451.83%            
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%            
Common stock issued     873,430            
Market closing price per share     $ 16.57            
Estimated transaction value     $ 23,000,000            
Costs related to the acquisition     1,600,000            
Acquisition of goodwill     6,443,000         $ 6,400,000 $ 6,900,000
Net intangible assets acquired     526,000            
Purchase price of the business assets, portion deductible     0            
Core deposit intangible amortization period       10 years          
Total estimated purchase price     $ 22,983,000            
Payments received as cash consideration         $ (30,437,000)        
Kosciusko Financial Inc [Member] | Maximum [Member]                  
Business Acquisition [Line Items]                  
Number of shares owned     100            
Share of common stock outstanding per share     $ 81.75            
Central National Bank & Trust [Member]                  
Business Acquisition [Line Items]                  
Acquisition of goodwill             $ 609,000    
Net intangible assets acquired             190,000    
Purchase price of the business assets, portion deductible             0    
Core deposit intangible amortization period       10 years          
Total estimated purchase price             5,311,000    
Performing portion of the loan portfolio acquired             10,800,000    
Estimated fair value of performing portion of the loan portfolio             $ 10,500,000    
LaPorte Bancorp Inc [Member]                  
Business Acquisition [Line Items]                  
Exchange ratio per share   94.35%              
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%              
Common stock issued   3,421,488              
Market closing price per share   $ 18.36              
Estimated transaction value   $ 98,600,000              
Costs related to the acquisition   4,000,000              
Acquisition of goodwill   20,993,000              
Net intangible assets acquired   2,514,000              
Purchase price of the business assets, portion deductible   0              
Core deposit intangible amortization period       10 years          
Total estimated purchase price   $ 98,634,000              
Goodwill adjustment       $ 703,000          
First Farmers Bank & Trust Co [Member]                  
Business Acquisition [Line Items]                  
Acquisition of goodwill $ 0                
Net intangible assets acquired $ 463,000                
Core deposit intangible amortization period 10 years                
Payments received as cash consideration $ 10,900,000                
Business acquisition, loans assumed $ 3,400,000                
Premium on deposits paid 3.00%                
Business acquisition, customer deposit balances $ 14,800,000