Other Comprehensive Income (Loss) Reclassifications from Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]
Reclassification adjustment for sales of available-for-sale securities, net of tax	$ 0	$ 208	$ 4	$ 486
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$ 0	$ 208	$ 4	$ 486