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Business - Additional Information (Detail) $ in Millions | Mar. 10, 2017 USD ($) Branch | Feb. 29, 2016 USD ($) Branch | Dec. 31, 2017 Location Subsidiary
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Schedule Of Description Of Company [Line Items] |  |  |
Number of inactive subsidiaries | Subsidiary |  |  | 1
Bank operated banking centers, number | Location |  |  | 50
Bank operated trust office locations, number | Location |  |  | 3
Valley Commerce Bancorp [Member] |  |  |
Schedule Of Description Of Company [Line Items] |  |  |
Total assets of acquired/merger company | $ | $ 400 |  |
Number of bank branches acquired | Branch | 4 |  |
County Commerce Bank [Member] |  |  |
Schedule Of Description Of Company [Line Items] |  |  |
Total assets of acquired/merger company | $ |  | $ 253 |
Number of bank branches acquired | Branch |  | 4 |

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- Definition Bank operated banking centers number. + References No definition available. + Details
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- Definition Bank operated wealth management offices, number. + References No definition available. + Details
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- Definition Number of bank branches acquired. + References No definition available. + Details
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- Definition Amount of assets acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Details
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- Details
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