Available-for-sale Securities Fair Value and Gross Realized Gains (Losses) (Details) (USD $)	9 Months Ended
	Dec. 31, 2012
Investments, Debt and Equity Securities [Abstract]
Available-for-sale securities, gross realized gains	$ 1,900,000
Available-for-sale securities, gross realized losses	(600,000)
Fair value of sold available-for-sale securities	91,000,000
Other-than-temporary impairments	$ (100,000)
Bank of America common stock owned	1,800,000