Income Taxes - Schedule of Reconciliation of Statutory Income Taxes and Effective Income Taxes (Details) - 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, 2015 |
Sep. 30, 2015 |
Jun. 30, 2015 |
Mar. 31, 2015 |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
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| Effective Income Tax Rate Reconciliation, Amount [Abstract] | |||||||||||||||
| Income before taxes | $ 13,040 | $ 14,209 | $ 14,287 | $ 9,063 | $ 10,599 | $ 15,475 | $ 5,731 | $ 6,529 | $ 8,345 | $ 4,803 | $ 5,117 | $ 4,567 | $ 50,599 | $ 38,334 | $ 22,832 |
| Federal statutory income tax, amount | 17,710 | 13,417 | 7,991 | ||||||||||||
| State tax, net of Federal benefit, amount | 3,313 | 2,510 | 1,536 | ||||||||||||
| Windfall benefit - exercise of stock options, amount | (3,762) | (1,025) | |||||||||||||
| Change in federal rate, amount | 5,414 | ||||||||||||||
| Other items, net, amount | 342 | 129 | (73) | ||||||||||||
| Total | $ 10,767 | $ 4,629 | $ 4,671 | $ 2,950 | $ 4,082 | $ 5,800 | $ 2,407 | $ 2,742 | $ 3,297 | $ 2,041 | $ 2,175 | $ 1,941 | $ 23,017 | $ 15,031 | $ 9,454 |
| Effective Income Tax Rate Reconciliation, Percent [Abstract] | |||||||||||||||
| Federal statutory income tax rate | 35.00% | 35.00% | 35.00% | ||||||||||||
| State tax, net of Federal benefit, rate | 6.55% | 6.55% | 6.73% | ||||||||||||
| Windfall benefit - exercise of stock options, rate | (7.43%) | (2.67%) | |||||||||||||
| Change in federal rate | 10.70% | ||||||||||||||
| Other items, net, rate | 0.68% | 0.34% | (0.32%) | ||||||||||||
| Effective income tax rate | 45.49% | 39.22% | 41.41% | ||||||||||||
| X | ||||||||||
- Definition Effective income tax rate reconciliation exercise of stock options. No definition available.
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- Definition Income tax reconciliation exercise of stock options. No definition available.
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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- References No definition available.
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Percentage 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 changes in the income tax rates. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Percentage 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 other adjustments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Percentage 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 applicable to state and local income tax expense (benefit), net of federal tax expense (benefit). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- 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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- 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 other adjustments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- 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 state and local income tax expense (benefit). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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