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Variable Interest Entities Text Tag (Details) (USD $)	12 Months Ended
Variable Interest Entities Text Tag (Details) (USD $)	Mar. 31, 2013	Sep. 30, 2011	Dec. 30, 2010	May 15, 2009	Apr. 28, 2006	Mar. 31, 2013 Carver Statutory Trust 1 [Member]	Mar. 31, 2013 CDE 10 [Member]	Mar. 31, 2008 CDE 10 [Member]	Mar. 31, 2013 CDE 1-9, CDE 11-12 [Member]	Dec. 31, 2010 CDE 1-9, CDE 11-12 [Member]
Entity Information [Line Items]
Variable Interest Entity, Funded Exposure, Debt Investment	$ 13,000,000					$ 13,000,000	$ 0		$ 0
Variable Interest Entity, Funded Exposure, Equity Invesment	0					400,000	0		0
Cash			6,700,000
New Market Tax Credit Award		25,000,000		65,000,000	59,000,000
Variable Interest Entity, Rights Transferred	149,000,000			40,000,000		0	19,000,000	19,000,000	40,000,000
Stockholders' Equity Attributable to Noncontrolling Interest										$ 6,700,000
% of Carver Statutory Trust I owned	100.00%

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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