Consolidated Statement of Changes in Stockholders' Equity - USD ($)	Total	Preferred Stock [Member]		Common Stock [Member]		Additional Paid-in Capital [Member]		Accumulated deficit [Member]		Treasury Stock [Member]		Accumulated Other Comprehensive Income (Loss) [Member]		Noncontrolling Interest [Member]
Stockholders' Equity at Mar. 31, 2013	$ 56,735,000	$ 45,118,000		$ 61,000		$ 55,708,000		$ (44,439,000)		$ (417,000)		$ 563,000		$ 141,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Pension plan adjustment	0	0	[1]	0	[1]	0	[1]	716,000	[1]	0	[1]	(716,000)	[1]	0	[1]
Net (loss) / income attributable to Carver Bancorp, Inc.	(836,000)	0		0		0				0		0		0
Other comprehensive income (loss), net of tax	(4,615,000)	0		0		0		0		0		(4,615,000)		0
Transfer between Non-controlling and Controlling Interest	0	0		0		400,000		0		0		0		(400,000)
Net (loss) / income attributable to non-controlling interest	(110,000)	0		0		0		0		0		0		(110,000)
Treasury stock activity	(5,000)	0		0		6,000		(11,000)		0		0		0
Stockholders' Equity at Mar. 31, 2014	51,169,000	45,118,000		61,000		56,114,000		(44,570,000)		(417,000)		(4,768,000)		(369,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) / income attributable to Carver Bancorp, Inc.	364,000	0		0		0				0		0		0
Other comprehensive income (loss), net of tax	3,723,000	0		0		0		0		0		3,723,000		0
Transfer between Non-controlling and Controlling Interest	0	0		0		(650,000)		0		0		0		650,000
Net (loss) / income attributable to non-controlling interest	(281,000)	0		0		0		0		0		0		(281,000)
Treasury stock activity	4,000	0		0		4,000		0		0		0		0
Stockholders' Equity at Mar. 31, 2015	$ 54,979,000	$ 45,118,000		$ 61,000		$ 55,468,000		$ (44,206,000)		$ (417,000)		$ (1,045,000)		$ 0

[1] (1) Adjustment reflected within total equity relating to the accounting for pension plans under ASC 715-30. Refer to notes 1, 13 and 18 for further detail.