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Business - Additional Information (Detail) $ / shares in Units, $ in Millions | Feb. 26, 2018 USD ($) $ / shares | Mar. 31, 2018 Location Subsidiary | Dec. 31, 2017 USD ($)
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Schedule Of Description Of Company [Line Items] |  |  |
Number of inactive subsidiaries | Subsidiary |  | 1 |
Bank operated banking centers, number | Location |  | 51 |
Bank operated trust office locations, number | Location |  | 3 |
Stock price | $ / shares | $ 23.60 |  |
Community Bank [Member] |  |  |
Schedule Of Description Of Company [Line Items] |  |  |
Total assets |  |  | $ 3,750.0
Gross loans |  |  | 2,740.0
Total deposits |  |  | $ 2,860.0
Number of share to be received in respect of each share of common stock | 9.4595 |  |
Amount of cash paid per share | $ / shares | $ 56.00 |  |
Merger transaction value | $ 885.2 |  |

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