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Business Combination - Additional Information (Detail)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 30, 2015
USD ($)
Location
$ / shares
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Business Acquisition [Line Items]          
Merger costs   $ 486 $ 308 $ 0  
Deferred tax asset included in accrued interest receivable and other assets   7,609 6,470    
Gross loans acquired   126,134      
Combined yield and credit mark   3,928      
Goodwill arising from Acquisition   38,730 27,194 $ 27,194  
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