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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2017 USD ($) Segment shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of reportable operating segment | Segment | 1 |  |
Period of delinquent loan | 90 days |  |
Advertising costs | $ 2,243,000 | $ 1,799,000 | $ 1,580,000
Number of nonqualified options or restricted stock for key employees and independent director | shares | 500,000 |  |
Description of award terms | For key employees, the plan vesting schedule is one-fourth of granted stock-based awards per year beginning one year after the grant date with 100% vested on the fourth anniversary. For independent directors, the vesting schedule is one-third of granted stock-based awards per year beginning one year after the grant date with 100% vested on the third anniversary. |  |
Unrecognized compensation cost related to nonvested stock options granted | $ 0 | $ 0 |
Stock options, granted | shares | 0 | 0 | 0
Shares granted, restricted common stock | shares | 39,673 | 52,750 | 48,300
Compensation expense restricted stock awards | $ 928,000 | $ 820,000 | $ 621,000
Average amount of non interest bearing reserve with federal reserve bank | $ 50,000 | $ 50,000 |
Independent Directors [Member] |  |  |
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% |  |
Stock incentive plan, vesting per year | 33.33% |  |
Award vesting period | 3 years |  |
Key Employees [Member] |  |  |
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% |  |
Stock incentive plan, vesting per year | 25.00% |  |
Award vesting period | 4 years |  |
Minimum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Percentage of tax benefit realized | 50.00% |  |
Maximum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Period of Consumer loans charged off | 180 days |  |
Premises and Equipment [Member] | Minimum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful lives of premises and equipment | 3 years |  |
Premises and Equipment [Member] | Maximum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful lives of premises and equipment | 39 years |  |
Furniture, Fixtures and Equipment [Member] | Minimum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful lives of premises and equipment | 3 years |  |
Furniture, Fixtures and Equipment [Member] | Maximum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful lives of premises and equipment | 10 years |  |
Buildings and Building Improvements [Member] | Minimum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful lives of premises and equipment | 15 years |  |
Buildings and Building Improvements [Member] | Maximum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful lives of premises and equipment | 39 years |  |
Core Deposit [Member] | FC Banc Corp [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Amortization of intangible assets | 7 years |  |
Core Deposit [Member] | Lake National Bank of Mentor, Ohio [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Amortization of intangible assets | 4 years |  |

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