Consolidated Statement of Changes in Stockholders' Equity - 6 months ended Sep. 30, 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.	12	0	0	0	0	12	0
Other comprehensive loss, net of taxes	227		0	0	0	0	227
Stock based compensation expense	2		0	2	0	0	0
Equity at Sep. 30, 2015	$ 55,220	$ 45,118	$ 61	$ 55,470	$ (417)	$ (44,194)	$ (818)