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Summary of Significant Accounting Policies (Detail) | 12 Months Ended |
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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 |  |  |

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