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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 |
--- | --- | --- | ---
Jan. 01, 2019 | Sep. 30, 2020 | Dec. 31, 2019
Assets |  |  |
Goodwill |  | $ 47,340 | $ 47,340
Limberlost Bancshares, Inc. [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Cash | $ 8,465 |  |
Common Shares (1,830,000 shares) | 70,437 |  |
Total | 78,902 | $ 78,902 |
Assets |  |  |
Cash and cash equivalents | 6,376 |  |
Securities - available-for-sale | 17,494 |  |
Other securities, at cost | 2,347 |  |
Loans, net | 257,183 |  |
Premises and equipment | 2,538 |  |
Goodwill | 43,266 |  |
Other assets | 7,176 |  |
Total Assets Purchased | 336,380 |  |
Deposits |  |  |
Noninterest bearing | 37,822 |  |
Interest bearing | 168,312 |  |
Total deposits | 206,134 |  |
Federal Home Loan Bank (FHLB) advances | 48,196 |  |
Accrued expenses and other liabilities | 3,148 |  |
Total Liabilities Assumed | $ 257,478 |  |

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