v3.8.0.1

Income Taxes - Schedule of Reconciliation of Statutory Income Taxes and Effective Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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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
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%

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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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- 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. + 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 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: 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 + Details
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