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Nature of Business - Additional Information (Detail) | Dec. 31, 2016 Branches Location | Dec. 31, 2015 Branches | Dec. 31, 2014 Branches
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Nature of Business [Line Items] |  |  |
Number of branches | 339 |  |
Number of branches opened | Branches | 8 | 31 | 36
Alabama [Member] |  |  |
Nature of Business [Line Items] |  |  |
Number of branches | 49 |  |
Georgia [Member] |  |  |
Nature of Business [Line Items] |  |  |
Number of branches | 8 |  |
New Mexico [Member] |  |  |
Nature of Business [Line Items] |  |  |
Number of branches | 19 |  |
North Carolina [Member] |  |  |
Nature of Business [Line Items] |  |  |
Number of branches | 36 |  |
Oklahoma [Member] |  |  |
Nature of Business [Line Items] |  |  |
Number of branches | 28 |  |
South Carolina [Member] |  |  |
Nature of Business [Line Items] |  |  |
Number of branches | 72 |  |
Tennessee [Member] |  |  |
Nature of Business [Line Items] |  |  |
Number of branches | 21 |  |
Texas [Member] |  |  |
Nature of Business [Line Items] |  |  |
Number of branches | 98 |  |
Virginia [Member] |  |  |
Nature of Business [Line Items] |  |  |
Number of branches | 8 |  |

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