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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Schedule Of Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Federal income tax rate |  |  |  |  |  |  |  |  |  | 35.00% | 35.00% | 35.00%
State net operating loss carryforward | $ 9,700 |  |  |  | $ 1,200 |  |  |  |  | $ 9,700 | $ 1,200 |
State net operating loss carryforwards expiration period |  |  |  |  |  |  |  |  |  | 2030 |  |
Deferred tax asset for the allowance for credit losses | 5,000 |  |  |  |  |  |  |  |  | $ 5,000 |  |
Deferred tax assets, state taxes | 300 |  |  |  | 32 |  |  |  |  | 300 | 32 |
Income tax expense | 923 | $ 3,235 | $ 3,751 | $ 2,385 | $ 4,014 | $ 4,020 | $ 3,668 | $ 3,215 |  | 10,294 | 14,917 | $ 14,774
Tax benefit |  |  |  |  |  |  |  |  |  | 1,600 | $ 0 | $ 0
Provisional benefit to income tax expense, Tax Act | $ 3,100 |  |  |  |  |  |  |  |  | $ 3,122 |  |
Tax Year 2013 [Member] | Tennessee [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Open tax year |  |  |  |  |  |  |  |  |  | 2013 |  |
Tax Year 2013 [Member] | South Carolina [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Open tax year |  |  |  |  |  |  |  |  |  | 2013 |  |
Earliest Tax Year [Member] | Texas [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Open tax year |  |  |  |  |  |  |  |  |  | 2011 |  |
Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Federal income tax rate |  |  |  |  |  |  |  |  | 21.00% |  |  |

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- Definition The aggregate cash inflow comprised of the amount received from (a) employees to acquire the entity's shares under incentive awards, including stock option exercises and restricted stock arrangements, and (b) the excess tax benefit arising from such transactions. + References No definition available. + Details
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