Available-for-sale Securities Fair Value and Gross Realized Gains (Losses) (Details) (USD $)	6 Months Ended
	Sep. 30, 2012
Investments, Debt and Equity Securities [Abstract]
Available-for-sale securities, gross realized gains	$ 200,000
Available-for-sale securities, gross realized losses	300,000
Fair value of sold available-for-sale securities	54,000,000
Other-than-temporary impairments	$ 100,000
Bank of America common stock owned	1,800,000