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Business Combination Business Combination (Detail) $ / shares in Units, $ in Thousands | Sep. 30, 2020 $ / shares | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
--- | --- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |  |
Assets |  | $ 3,763,659 |  | $ 3,221,521 |  |
Deposits |  | 3,102,327 |  | 2,610,786 |  |
Stockholders' equity |  | $ 304,966 |  | $ 262,830 | $ 243,910 | $ 211,784
Scenario, Forecast | Bank of Akron |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Share price (in dollars per share) | $ / shares | $ 215.00 |  |  |  |  |
Share conversion ratio | 6.6729 |  |  |  |  |
Percentage of shares exchanged | 75.00% |  |  |  |  |
Bank of Akron |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Assets |  |  | $ 388,900 |  |  |
Deposits |  |  | 339,700 |  |  |
Stockholders' equity |  |  | $ 38,400 |  |  |

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