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Business Combinations - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
Jun. 13, 2017
May 23, 2017
Dec. 29, 2016
May 22, 2017
Mar. 31, 2017
Lafayette Community Bancorp [Member]          
Business Acquisition [Line Items]          
Exchange ratio per share   58.78%      
Cash paid for each share   $ 1.73      
Number of common shares purchased     90,574    
Percentage of common shares purchased     4.65%    
Market closing price per share       $ 25.38  
Estimated transaction value       $ 32.0  
Reported total assets of acquiree         $ 172.1
Total deposits held by acquiree         149.2
Total loans of acquiree         135.2
Lafayette Community Bancorp [Member] | Maximum [Member]          
Business Acquisition [Line Items]          
Number of shares owned   100      
Share of common stock outstanding per share   $ 17.25      
Wolverine Bancorp Inc [Member]          
Business Acquisition [Line Items]          
Exchange ratio per share 101.52%        
Cash paid for each share $ 14.00        
Market closing price per share $ 27.50        
Estimated transaction value $ 91.8        
Reported total assets of acquiree         379.3
Total deposits held by acquiree         271.1
Total loans of acquiree         $ 315.9