Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Net income available to common shareholders of Carver Bancorp, Inc.	$ (165)	$ 210	$ 12	$ 381
Weighted Average Number of Shares Outstanding, Basic and Diluted	3,696,420	3,696,370	3,696,420	3,696,297
Basic	$ (0.04)	$ 0.06	$ 0.00	$ 0.10
Diluted	$ (0.04)	$ 0.06	$ 0.00	$ 0.10