Consolidated Statements of Comprehensive Loss Statement (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income attributable to Carver Bancorp, Inc.	$ 210	$ 342	$ 381	$ 753
Other Comprehensive (Loss) Income, Net of Tax [Abstract]
Change in unrealized loss of securities available-for sale	150	(1,314)	1,713	(5,433)
Reclassification adjustment for sales of available-for-sale securities, net of tax	0	208	4	486
Other Comprehensive Income (Loss), Net of Tax	150	(1,522)	1,709	(5,919)
Total comprehensive income (loss), net of tax attributable to Carver Bancorp, Inc.	$ 360	$ (1,180)	$ 2,090	$ (5,166)