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Subsequent Event - Additional Information (Detail) - Capital Bank - Subsequent Event $ / shares in Units, $ in Millions | Jan. 31, 2019 USD ($) Banking_Office $ / shares shares
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Subsequent Event [Line Items] |
Share price | $ / shares | $ 24.01
Consideration paid | $ 76.8
Stock issued during period, shares, acquisitions | shares | 3,185,000
Number of banking offices | Banking_Office | 4
Purchase accounting adjustments, assets | $ 498.0
Purchase accounting adjustments, loans | 311.0
Purchase accounting adjustments, deposits | $ 449.0

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