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Goodwill and Intangible Assets - Additional Information (Detail) - Core Deposit - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2013
Goodwill [Line Items]        
Intangible asset       $ 4,834
Amortization expense $ 489 $ 662 $ 835  
Net carrying value 410 899    
Lake National Bank of Mentor, Ohio        
Goodwill [Line Items]        
Intangible asset     1,583  
Amortization expense 409 567 $ 290  
Net carrying value $ 317 $ 726