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Business Combination and Branch Sale (Detail)
$ / shares in Units, $ in Thousands
12 Months Ended
May 19, 2017
USD ($)
Dec. 30, 2015
USD ($)
location
$ / shares
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Business Acquisition [Line Items]          
Merger costs     $ 0 $ 0 $ 486
Gain from sale of branch     $ 0 536 $ 0
Lake National Bank          
Business Acquisition [Line Items]          
Share price (in dollars per share) | $ / shares   $ 22.50      
Fair value of total consideration transferred   $ 24,750      
Merger costs       $ 486  
First Federal Community Bank          
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%        
Mentor, Ohio | Lake National Bank          
Business Acquisition [Line Items]          
Number of branch locations | location   2