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Goodwill and Intangible Assets - Additional Information (Detail) - Core Deposit - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2013
Goodwill [Line Items]          
Net carrying value $ 160        
FC Banc Corp          
Goodwill [Line Items]          
Intangible asset         $ 4,834
Amortization expense 316 $ 489 $ 662    
Net carrying value 94 410      
Lake National Bank of Mentor, Ohio          
Goodwill [Line Items]          
Intangible asset       $ 1,583  
Amortization expense 251 409 $ 567    
Net carrying value $ 66 $ 317