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Business Combination and Asset Purchase - Additional Information (Detail) |  |  | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2019 USD ($) Office $ / shares shares | Dec. 13, 2013 USD ($) | Sep. 30, 2020 USD ($) shares | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) shares
Business Acquisition [Line Items] |  |  |  |  |
Common stock, shares outstanding | shares |  |  | 12,230,000 |  | 12,230,000
Recognition of core deposit intangible asset with acquired purchase |  |  | $ 3,900,000 |  |
Remaining economic useful life |  |  | 7 years |  |
Goodwill |  |  | $ 47,340,000 |  | $ 47,340,000
Fair value adjustment of loans acquired and accounted | $ 2,118,000 |  | 0 |  | $ 62,000
Amortization expense |  |  | 546,000 | $ 546,000 |
Amortization expense |  |  | $ 721,000 |  |
Core Deposits [Member] | Custar [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Recognition of core deposit intangible asset with acquired purchase |  | $ 1,170,000 |  |  |
Remaining economic useful life |  |  | 7 years |  |
Limberlost Bancshares, Inc. [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Common stock issued in exchange of each outstanding share | shares | 1,830,000 |  |  |  |
Total consideration for acquisition | $ 78,902,000 |  | $ 78,902,000 |  |
Cash paid for acquisition | 8,465,000 |  |  |  |
Stock issued for acquisition | 70,437,000 |  |  |  |
Goodwill | 43,266,000 |  |  |  |
Limberlost Bancshares, Inc. [Member] | Core Deposits [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Recognition of core deposit intangible asset with acquired purchase | $ 3,900,000 |  |  |  |
Remaining economic useful life | 7 years |  |  |  |
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 |  |  |  |
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 | $ 78,900,000 |  |  |  |
Cash paid for acquisition | 8,500,000 |  |  | $ 8,465,000 |
Stock issued for acquisition | $ 70,400,000 |  |  |  |

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