Other Comprehensive Income (Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Other Comprehensive Income [Abstract]
Net unrealized holding gains on available-for-sale securities, before tax	$ 440	$ 665
Net unrealized holding gains on available-for-sale securities, tax effect	(150)	(217)
Net unrealized holding gains on available-for-sale securities, net of tax amount	290	448
Reclassification adjustment for realized gains in net income, before tax amount	(197)	(62)
Reclassification adjustment for realized gains in net income, tax effect	(67)	(20)
Reclassification adjustment for realized gains in net income, net of tax amount	(130)	(42)
Total, before tax amount	243	603
Total, tax effect	83	197
Total, net of tax amount	$ 160	$ 406