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Recent Developments Including Mergers and Acquisitions - Additional Information (Detail) - USD ($) |  |  | 1 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 05, 2020 | Aug. 15, 2019 | Jan. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2019
Business Combination Separately Recognized Transactions [Line Items] |  |  |  |  |
Goodwill |  |  |  | $ 149,922,000 | $ 148,604,000
Gain on sale of property held in other real estate owned |  |  | $ 2,200,000 |  |
COVID 19 [Member] |  |  |  |  |
Business Combination Separately Recognized Transactions [Line Items] |  |  |  |  |
Loans modification |  |  |  | $ 939,800,000 |
Citizens Bankshares, Inc [Member] |  |  |  |  |
Business Combination Separately Recognized Transactions [Line Items] |  |  |  |  |
Date of acquisition | Mar. 05, 2020 |  |  |  |
Total assets acquired | $ 47,800,000 |  |  |  |
Loans | 22,900,000 |  |  |  |
Deposits | 45,000,000.0 |  |  |  |
Purchase price | 2,900,000 |  |  |  |
Intangibles assets, net | 206,000 |  |  |  |
Goodwill | $ 1,300,000 |  |  |  |
Pegasus Bank [Member] |  |  |  |  |
Business Combination Separately Recognized Transactions [Line Items] |  |  |  |  |
Date of acquisition |  | Aug. 15, 2019 |  |  |

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