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Business Combinations (Detail) $ / shares in Units, $ in Thousands | Sep. 30, 2020 USD ($) $ / shares | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
--- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |
Assets |  | $ 3,779,138 | $ 3,763,659 |  |
Deposits |  | 3,100,216 | 3,102,327 |  |
Stockholders' equity |  | $ 324,802 | $ 304,966 | $ 274,959 | $ 262,830
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 | Scenario, Forecast |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Assets | $ 388,500 |  |  |  |
Deposits | 341,400 |  |  |  |
Stockholders' equity | $ 38,700 |  |  |  |

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