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Subsequent Event - Acquisition of Lake National Bank - Additional Information (Detail)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Dec. 30, 2015
USD ($)
$ / shares
Jun. 30, 2016
USD ($)
Branches
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Branches
Jun. 30, 2015
USD ($)
Business Acquisition [Line Items]          
Merger costs   $ 173 $ 0 $ 215 $ 0
Lake National Bank of Mentor, Ohio [Member]          
Business Acquisition [Line Items]          
Share price | $ / shares $ 22.50        
Aggregate cash paid $ 24,750        
Number of branches | Branches   2   2  
Merger costs   $ 173   $ 215