Accumulated other comprehensive loss 2 of 2 (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Unrealized holding gain (loss) arising during the period, net of deferred taxes of $0 for all periods	$ 194	$ 610	$ (489)	$ 198
Reclassification adjustment for gain included in net income, net of deferred tax expense of $0 for all periods	$ 253	$ (32)	$ 400	$ (157)