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Income Taxes - Reconciliation between statutory and effective tax rate (Details)	12 Months Ended
	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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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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