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Income Taxes - Reconciliation between statutory and effective tax rate (Details) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reconciliation between statutory U.S. federal income tax rate and effective tax rate |  |  |
Calculated tax benefit at statutory rate | 35.00% | 35.00% | 35.00%
Increase (decrease) in income taxes resulting from: |  |  |
Reversal of valuation allowance, net of change in estimated Section 382 impact |  | (1167.60%) | 73.40%
State taxes, net of federal income tax | 6.50% | 6.10% | 5.00%
Tax exempt income | (0.70%) | (5.30%) | 24.20%
Non-deductible expenses | 0.20% | 14.80% | (137.60%)
Remeasurement of net deferred tax assets | 5.80% |  |
Total income tax expense (benefit) | 46.80% | (1117.00%) |

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to 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 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 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 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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