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Business Combination and Branch Sale - Additional Information (Detail)
$ / shares in Units, $ in Thousands
12 Months Ended
May 19, 2017
USD ($)
Dec. 30, 2015
USD ($)
Location
$ / shares
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jul. 15, 2016
USD ($)
Business Acquisition [Line Items]            
Merger costs     $ 0 $ 486 $ 308  
Deferred tax asset included in accrued interest receivable and other assets     4,249 7,609    
Gross loans acquired     126,134      
Combined yield and credit mark     3,928      
Goodwill arising from Acquisition     38,730 38,730 27,194  
Gain from sale of branch     536 0 0  
Lake National Bank of Mentor, Ohio [Member]            
Business Acquisition [Line Items]            
Share price | $ / shares   $ 22.50        
Fair value of total consideration transferred   $ 24,750        
Number of branch locations | Location   2        
Merger costs       $ 486 $ 308  
Deferred tax asset included in accrued interest receivable and other assets     58      
Goodwill arising from Acquisition     $ 11,536     $ 11,536
First Federal Community Bank [Member]            
Business Acquisition [Line Items]            
Loans transferred $ 7,800          
Fixed assets 100          
Deposits transferred 7,400          
Gain from sale of branch $ 536          
Deposit Premium 8.00%