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Income Taxes - Provision for income taxes (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Current:
Federal									$ 1,705	$ 4,563	$ 6,964
State									340	724	1,054
Total current									2,045	5,287	8,018
Deferred:
Federal									1,847	(1,688)	(254)
State									369	(268)	(38)
Total deferred									2,216	(1,956)	(292)
Income tax expense	$ (171)	$ 3,712	$ 220	$ 500	$ (641)	$ 981	$ 1,188	$ 1,803	$ 4,261	$ 3,331	$ 7,726

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