Consolidated Statement of Changes in Stockholders' Equity - 9 months ended Dec. 31, 2015 - USD ($) $ in Thousands	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Accumulated deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Equity at Mar. 31, 2015	$ 54,979	$ 45,118	$ 61	$ 55,468	$ (417)	$ (44,206)	$ (1,045)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to Carver Bancorp, Inc.	451	0	0	0	0	451	0
Other comprehensive loss, net of taxes	(365)	0	0	0	0	0	(365)
Stock based compensation expense	0	0	0	2	0	(2)	0
Equity at Dec. 31, 2015	$ 55,065	$ 45,118	$ 61	$ 55,470	$ (417)	$ (43,757)	$ (1,410)