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Business Combination and Asset Purchase - Summary of Consideration Paid and Amounts of Assets Acquired and Liabilities Assumed Recognized (Detail) - USD ($) $ in Thousands |  |  | 9 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2021 | Nov. 16, 2020 | Sep. 30, 2021 | Dec. 31, 2020
Assets |  |  |  |
Goodwill |  |  | $ 55,214 | $ 47,340
Ossian Financial Services, Inc. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash | $ 20,001 |  | $ 20,001 |
Total | 20,001 |  |  |
Assets |  |  |  |
Cash and cash equivalents | 20,229 |  |  |
Interest-bearing time deposits | 20,226 |  |  |
Securities - available-for-sale | 30,243 |  |  |
Other securities, at cost | 281 |  |  |
Loans, net | 52,403 |  |  |
Premises and equipment | 494 |  |  |
Goodwill | 7,874 |  |  |
Other assets | 5,308 |  |  |
Total Assets Purchased | 137,058 |  |  |
Deposits |  |  |  |
Noninterest bearing | 34,509 |  |  |
Interest bearing | 81,535 |  |  |
Total deposits | 116,044 |  |  |
Accrued expenses and other liabilities | 1,013 |  |  |
Total Liabilities Assumed | $ 117,057 |  |  |
Adams County Financial Resources [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total |  | $ 825 |  |
Assets |  |  |  |
Premises and equipment |  | 25 |  |
Customer list intangible |  | 800 |  |
Total Assets Purchased |  | 825 |  |
Deposits |  |  |  |
Common Shares (40,049 shares) |  | $ 825 |  |

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