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Business Combination and Asset Purchase - Additional Information (Detail) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 16, 2020 USD ($) shares | Jan. 01, 2019 USD ($) Office $ / shares shares | Mar. 31, 2021 USD ($) shares | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) shares | Nov. 30, 2020 USD ($) Client
Business Acquisition [Line Items] |  |  |  |  |  |
Common stock, shares outstanding | shares |  |  | 12,230,000 |  | 12,230,000 |
Recognition of core deposit intangible asset with acquired purchase |  |  | $ 3,900 |  |  |
Remaining economic useful life |  |  | 7 years |  |  |
Goodwill |  |  | $ 47,340 |  | $ 47,340 |
Amortization expense |  |  | 140 | $ 182 |  |
Amortization expense for 2021 |  |  | 560 |  |  |
Custar [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Amortization expense |  |  |  | $ 42 |  |
Customer Lists [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Amortization expense |  |  | 31 |  |  |
Amortization expense for 2021 |  |  | 123 |  |  |
Bank of Geneva [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of full-service offices | Office |  | 6 |  |  |  |
Limberlost Bancshares, Inc. [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Common stock issued in exchange of each outstanding share | shares |  | 1,830,000 |  |  |  |
Cash payment for exchange of each share | $ / shares |  | $ 8,465.00 |  |  |  |
Common stock, shares outstanding | shares |  | 1,000 |  |  |  |
Share price | $ / shares |  | $ 38.49 |  |  |  |
Total consideration for acquisition |  | $ 78,900 |  |  |  |
Cash paid for acquisition |  | 8,500 |  |  |  |
Stock issued for acquisition |  | 70,400 |  |  |  |
Goodwill |  | 43,300 |  |  |  |
Limberlost Bancshares, Inc. [Member] | Core Deposits [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Recognition of core deposit intangible asset with acquired purchase |  | $ 3,900 |  |  |  |
Remaining economic useful life |  | 7 years |  |  |  |
Adams County Financial Resources |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Common stock issued in exchange of each outstanding share | shares | 40,049 |  |  |  |  |
Total consideration for acquisition | $ 825 |  |  |  |  |
Stock issued for acquisition | 825 |  |  |  |  |
Assets under management amount |  |  |  |  |  | $ 83,000
Number of clients assets under management | Client |  |  |  |  |  | 450
Increase to noninterest income | 500 |  |  |  |  |
Adams County Financial Resources | Customer Lists [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Recognition of core deposit intangible asset with acquired purchase | $ 800 |  |  |  |  |
Remaining economic useful life | 6 years 6 months |  |  |  |  |
Amortization expense for 2021 |  |  | $ 123 |  |  |

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