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Summary of Significant Accounting Policies (Detail)
 2 Months Ended 12 Months Ended
Mar. 07, 2019
USD ($)
lease
Dec. 31, 2018
USD ($)
Segment
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
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      
Advertising costs   $ 2,345,000 $ 2,243,000 $ 1,799,000  
Number of nonqualified options or restricted stock for key employees and independent director (in shares) | shares   500,000      
Unrecognized compensation cost related to nonvested stock options granted   $ 0 $ 0    
Stock options (in shares) | shares   0 0 0  
Shares granted (in shares) | shares   24,508      
Average amount of non interest bearing reserve with federal reserve bank   $ 50,000 $ 50,000    
Reclassification of certain tax effects from accumulated other comprehensive income to retained earnings     $ 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   10,468 5,306    
Performance Based Restricted Stock Awards | Maximum          
Summary Of Significant Accounting Policies [Line Items]          
Shares granted (in shares) | shares   10,468 5,306    
Restricted Stock          
Summary Of Significant Accounting Policies [Line Items]          
Shares granted (in shares) | shares   40,108 39,673 52,750  
Compensation expense restricted stock awards   $ 1,545,000 $ 928,000 $ 820,000  
Accounting Standards Update 2018-02          
Summary Of Significant Accounting Policies [Line Items]          
Reclassification of certain tax effects from accumulated other comprehensive income to retained earnings     $ 237,000    
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      
Subsequent Event | Accounting Standards Update 2016-02          
Summary Of Significant Accounting Policies [Line Items]          
Number of leases | lease 2        
Scenario, Forecast | Accounting Standards Update 2016-02          
Summary Of Significant Accounting Policies [Line Items]          
Right-of-use asset         $ 12,500,000
Prepaid rent         800,000
Lease liability         $ 13,300,000
Scenario, Forecast | Subsequent Event | Accounting Standards Update 2016-02          
Summary Of Significant Accounting Policies [Line Items]          
Right-of-use asset $ 5,000,000        
Lease liability $ 5,000,000