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Summary of Significant Accounting Policies (Details) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2020 USD ($) | Dec. 31, 2020 USD ($) Segment | Dec. 31, 2019 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of reportable operating segment | Segment |  | 1 |
Accrued interest receivable on available-for-sale debt securities |  | $ 2,200 |
Accrued interest receivable |  | $ 15,400 |
Period of delinquent loan |  | 90 days |
DCF methodology, percentage |  | 90.80% |
WARM methodology, percentage |  | 9.20% |
Allowance for loan losses, period increase (decrease) |  | $ 5,000 | $ 0
Percentage of total loans | 0.255 | 1.000 | 1.000
Decrease to retained earnings |  | $ 3,400 |
Allowance for credit losses on loans | $ 670 |  |
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 |  | 4 years |
Core Deposit | Lake National Bank |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Amortization of intangible assets |  | 10 years |

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