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Summary of Significant Accounting Policies (Detail)
 12 Months Ended
Dec. 31, 2019
USD ($)
Segment
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Jan. 01, 2019
USD ($)
Summary Of Significant Accounting Policies [Line Items]        
Number of reportable operating segment | Segment 1      
Period of delinquent loan 90 days      
Number of nonqualified options or restricted stock for key employees and independent director (in shares) | shares 507,671      
Unrecognized compensation cost related to nonvested stock options granted   $ 0    
Stock options (in shares) | shares   0 0  
Shares granted (in shares) | shares 27,128      
Income tax benefit from share-based compensation $ 283,000 $ 324,000 $ 325,000  
Average amount of non interest bearing reserve with federal reserve bank 50,000 50,000    
Operating lease assets 18,422,000 0    
Operating lease liabilities $ 19,363,000 $ 0    
Key Employees        
Summary Of Significant Accounting Policies [Line Items]        
Starting period of vesting of stock based award 1 year      
Aggregate percentage of stock based awards to be matured 100.00%      
Independent Directors        
Summary Of Significant Accounting Policies [Line Items]        
Stock incentive plan, vesting per year 33.33%      
Starting period of vesting of stock based award 1 year      
Aggregate percentage of stock based awards to be matured 100.00%      
Award vesting period 3 years      
Maximum        
Summary Of Significant Accounting Policies [Line Items]        
Period of consumer loans charged off 180 days      
Premises and Equipment | Minimum        
Summary Of Significant Accounting Policies [Line Items]        
Useful lives of premises and equipment 3 years      
Premises and Equipment | Maximum        
Summary Of Significant Accounting Policies [Line Items]        
Useful lives of premises and equipment 39 years      
Furniture, Fixtures and Equipment | Minimum        
Summary Of Significant Accounting Policies [Line Items]        
Useful lives of premises and equipment 3 years      
Furniture, Fixtures and Equipment | Maximum        
Summary Of Significant Accounting Policies [Line Items]        
Useful lives of premises and equipment 10 years      
Buildings and Building Improvements | Minimum        
Summary Of Significant Accounting Policies [Line Items]        
Useful lives of premises and equipment 15 years      
Buildings and Building Improvements | Maximum        
Summary Of Significant Accounting Policies [Line Items]        
Useful lives of premises and equipment 39 years      
Core Deposit | FC Banc Corp        
Summary Of Significant Accounting Policies [Line Items]        
Amortization of intangible assets 7 years      
Core Deposit | Lake National Bank        
Summary Of Significant Accounting Policies [Line Items]        
Amortization of intangible assets 4 years      
Performance Based Restricted Stock Awards        
Summary Of Significant Accounting Policies [Line Items]        
Shares granted (in shares) | shares 16,681 15,657 7,109  
Compensation expense restricted stock awards $ 221,000 $ 314,000 $ 93,000  
Restricted Stock        
Summary Of Significant Accounting Policies [Line Items]        
Shares granted (in shares) | shares 40,978 40,108 39,673  
Compensation expense restricted stock awards $ 1,346,000 $ 1,545,000 $ 928,000  
Accounting Standards Update 2016-02        
Summary Of Significant Accounting Policies [Line Items]        
Operating lease assets       $ 12,500,000
Prepaid rent       800,000
Operating lease liabilities       $ 13,300,000
Tranche One | Key Employees        
Summary Of Significant Accounting Policies [Line Items]        
Stock incentive plan, vesting per year 33.33%      
Award vesting period 3 years      
Tranche Two | Key Employees        
Summary Of Significant Accounting Policies [Line Items]        
Stock incentive plan, vesting per year 25.00%      
Award vesting period 4 years