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Acquisitions - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Sep. 01, 2017
Feb. 03, 2017
Jul. 18, 2016
Jun. 01, 2016
Oct. 17, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Aug. 31, 2017
Nov. 07, 2016
Business Acquisition [Line Items]                    
Common stock, shares outstanding           38,375,407 38,294,729      
Acquisition of goodwill           $ 119,880 $ 119,880 $ 76,941    
Ownership interest percentage 5.00%                  
Operating revenue, net of tax             2,600 4,300    
Non-recurring expense, net of tax             2,700 4,800    
Kosciusko Financial Inc [Member]                    
Business Acquisition [Line Items]                    
Exchange ratio per share       6.7775%            
Cash paid for each share       $ 81.75            
Common stock issued       1,310,145            
Market closing price per share       $ 11.04            
Estimated transaction value       $ 23,000            
Costs related to the acquisition       2,000            
Total purchase price       22,983            
Net intangible assets acquired       526            
Acquisition of goodwill       $ 6,443            
Core deposit intangible amortization period           10 years        
Payments received as cash consideration               (30,437)    
Business combination stock transferred, percentage of consideration       65.00%            
Business combination cash transferred, percentage of consideration       35.00%            
Kosciusko Financial Inc [Member] | Maximum [Member]                    
Business Acquisition [Line Items]                    
Number of shares owned       100            
Share of common stock outstanding per share       $ 81.75            
LaPorte Bancorp Inc [Member]                    
Business Acquisition [Line Items]                    
Exchange ratio per share     1.4153%              
Cash paid for each share     $ 17.50              
Common stock issued     5,132,232              
Market closing price per share     $ 12.24              
Estimated transaction value     $ 98,600              
Costs related to the acquisition               $ 4,000    
Total purchase price     98,634              
Net intangible assets acquired     2,514              
Acquisition of goodwill     $ 20,993              
Core deposit intangible amortization period               10 years    
Payments received as cash consideration               $ (116,521)    
Business combination stock transferred, percentage of consideration     65.00%              
Business combination cash transferred, percentage of consideration     35.00%              
Central National Bank & Trust [Member]                    
Business Acquisition [Line Items]                    
Costs related to the acquisition               $ 779    
Total purchase price                   $ 5,311
Net intangible assets acquired                   190
Acquisition of goodwill                   609
Purchase price of the business assets, portion deductible                   5,300
Core deposit intangible amortization period               10 years    
Payments received as cash consideration               $ (22,549)    
Performing portion of the loan portfolio acquired                   10,800
Estimated fair value of performing portion of the loan portfolio                   $ 10,500
Wolverine Bancorp Inc [Member]                    
Business Acquisition [Line Items]                    
Exchange ratio per share         1.5228%          
Cash paid for each share         $ 14.00          
Common stock, shares outstanding         2,129,331          
Common stock issued         3,241,045          
Market closing price per share         $ 19.37          
Estimated transaction value         $ 93,800          
Costs related to the acquisition         1,900          
Total purchase price         93,773          
Net intangible assets acquired         2,024          
Acquisition of goodwill         $ 26,827          
Core deposit intangible amortization period           10 years        
Payments received as cash consideration             (12,723)      
Lafayette Community Bancorp [Member]                    
Business Acquisition [Line Items]                    
Exchange ratio per share 0.8817%                  
Cash paid for each share $ 1.73                  
Common stock, shares outstanding 1,856,679                  
Common stock issued 1,636,888                  
Market closing price per share                 $ 17.45  
Estimated transaction value                 $ 34,500  
Costs related to the acquisition $ 1,700                  
Total purchase price 34,465                  
Net intangible assets acquired 2,085                  
Acquisition of goodwill 15,408                  
Core deposit intangible amortization period           10 years        
Gain on remeasurement of equity interest $ 530           530      
Payments received as cash consideration             $ (20,425)      
Lafayette Community Bancorp [Member] | Maximum [Member]                    
Business Acquisition [Line Items]                    
Number of shares owned 100                  
Share of common stock outstanding per share $ 17.25                  
First Farmers Bank & Trust Co [Member]                    
Business Acquisition [Line Items]                    
Net intangible assets acquired   $ 452                
Core deposit intangible amortization period   10 years                
Payments received as cash consideration   $ 11,000                
Business acquisition, loans assumed   $ 3,400                
Premium on deposits paid   3.00%                
Business acquisition, customer deposit balances   $ 14,800