Consolidated Statements of Comprehensive Income (Loss) Statement (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Statement of Comprehensive Income [Abstract]
Net (loss) / income attributable to Carver Bancorp, Inc.	$ (836)	$ 662	$ (23,407)
Other comprehensive (loss) income, net of tax [Abstract]
Change in unrealized gain (loss) of securities available-for-sale, net	(5,282)	672	478
Change in pension obligations	71	(268)	0
Reclassification adjustments for sales of available-for-sale securities, net of tax	552	0	0
Reclassification adjustment for termination of pension plan, net of tax	(1,148)	0	0
Other Comprehensive (Loss) Income, Net of Tax	(4,615)	404	478
Comprehensive Income (Loss), Net of Tax, Attributable to Carver Bancorp, Inc.	$ (5,451)	$ 1,066	$ (22,929)