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Quarterly Information (Unaudited) - Summary of the Company's Quarterly Financial Information (Parenthetical) (Detail) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Dec. 31, 2017 | Sep. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2015
Quarterly Information [Line Items] |  |  |  |  |  |
Tax benefit related to the exercise of stock options |  |  |  | $ 1,500 |  |
Incremental hurricane allowance for credit losses |  |  | $ 3,000 |  |  |
Provisional benefit to income tax expense, Tax Act |  | $ 3,100 |  |  | $ 3,122 |
Bulk Sale of Charged Off Loans [Member] |  |  |  |  |  |
Quarterly Information [Line Items] |  |  |  |  |  |
Recovery from bulk sale of previously charged-off customer accounts in bankruptcy | $ 1,000 |  | $ 1,000 |  |  | $ 2,000

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32059-109318 + Details
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