Other Comprehensive Income (Loss) Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax			$ 0
Accumulated Other Comprehensive Loss, Available-for-sale Securities Adjustment, Net of Tax			(939)	$ (2,726)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Investment Transferred from Available-for-sale to Equity Method, after Tax				721
Other comprehensive loss, net of taxes	$ 142	$ (348)	1,021	(686)
Accumulated Other Comprehensive Loss, Available-for-sale Securities Adjustment, Net of Tax	$ 82	$ (2,691)	$ 82	$ (2,691)