Other Comprehensive Income (Loss) Reclassifications from Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Reclassification adjustment for sales of available-for-sale securities, net of tax	$ 1	$ 0	$ 1	$ 4
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$ 1	$ 0	$ 1	$ 4