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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
 12 Months Ended
Nov. 07, 2016
Jul. 18, 2016
Jun. 01, 2016
Jul. 01, 2015
Apr. 03, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Intangible Assets [Line Items]                
Goodwill acquired           $ 27,341,000 $ 21,424,000  
Goodwill impairment loss           0 0  
Amortization expense for intangible assets totaled           $ 1,200,000 $ 988,000 $ 880,000
Peoples Bancorp Inc [Member]                
Intangible Assets [Line Items]                
Goodwill acquired       $ 21,400,000        
Core deposit intangible amortization period           10 years    
Summit [Member]                
Intangible Assets [Line Items]                
Goodwill acquired         $ 8,400,000      
Core deposit intangible amortization period           10 years    
Central National Bank & Trust [Member]                
Intangible Assets [Line Items]                
Goodwill acquired $ 609,000              
Core deposit intangible amortization period           10 years    
LaPorte Bancorp Inc [Member]                
Intangible Assets [Line Items]                
Goodwill acquired   $ 20,300,000            
Core deposit intangible amortization period           10 years    
Kosciusko Financial Inc [Member]                
Intangible Assets [Line Items]                
Goodwill acquired     $ 6,400,000          
Core deposit intangible amortization period           10 years    
Core Deposits [Member] | Minimum [Member]                
Intangible Assets [Line Items]                
Core deposit intangible amortization period           7 years    
Core Deposits [Member] | Maximum [Member]                
Intangible Assets [Line Items]                
Core deposit intangible amortization period           10 years