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Business - Additional Information (Detail) $ in Millions | Dec. 31, 2015 FinancialCenters Subsidiary | Oct. 14, 2015 USD ($) Branch
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Schedule Of Description Of Company [Line Items] |  |
Number of inactive subsidiaries | Subsidiary | 1 |
Bank operated Business Financial Centers, number | 40 |
Bank operated Commercial Banking Centers, number | 8 |
Bank operated trust offices, number | 3 |
County Commerce Bank [Member] |  |
Schedule Of Description Of Company [Line Items] |  |
Total assets of merger company | $ |  | $ 250
Number of branches owned by merger company | Branch |  | 4

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- Definition Bank operated commercial 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 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=56956791&loc=d3e4845-128472 + Details
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- Details
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