Consolidated Statements of Comprehensive Loss Statement (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income attributable to Carver Bancorp, Inc.	$ 111	$ (823)	$ 491	$ (69)
Other Comprehensive (Loss) Income, Net of Tax [Abstract]
Change in unrealized loss of securities available-for sale	1,103	(1,546)	2,817	(6,979)
Change in pension obligations	0	(647)	0	(647)
Reclassification adjustment for sales of available-for-sale securities, net of tax	3	21	8	507
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net (Gain) Loss, Net of Tax	0	(1,148)	0	(1,148)
Other Comprehensive Income (Loss), Net of Tax	1,100	(1,066)	2,809	(6,985)
Total comprehensive income (loss), net of tax attributable to Carver Bancorp, Inc.	$ 1,211	$ (1,889)	$ 3,300	$ (7,054)