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Summary of Significant Accounting Policies (Detail) | 2 Months Ended | 12 Months Ended |
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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 |  |  |  |

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