Carver Bancorp Inc.-Parent Company Only Parent Company Statements of Cash Flow (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Condensed Cash Flow Statements, Captions [Line Items]
Net Income (Loss) Attributable to Carver Bancorp, Inc.	$ (170)	$ (272)	[1]
Increase (decrease) in other assets	2,075	(3,477)	[1]
Increase (decrease) in other liabilities	2,087	2,796	[2]
Net Cash Provided by (Used in) Operating Activities	490	3,618
Cash and Cash Equivalents, Period Increase (Decrease)	12,668	(71,562)
Parent Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net Income (Loss) Attributable to Carver Bancorp, Inc.	(170)	(272)	[3]
Equity in net income from subsidiaries	(764)	(582)	[4],[5]
Increase (Decrease) Due from Affiliates	(1)	(2)
Increase (decrease) in other assets	(14)	17
Increase (decrease) in accounts payable to subsidiaries	(1,199)	371
Increase (decrease) in other liabilities	464	476
Other, net	0	2
Net Cash Provided by (Used in) Operating Activities	(1,684)	10
Cash and Cash Equivalents, Period Increase (Decrease)	(1,684)	10
Cash - beginning	4,679	4,669
Cash - end	$ 2,995	$ 4,679

[1] (1) March 31, 2015 balances have been restated from previously reported results to correct for material and certain other errors from prior periods. Refer to Notes 1 and 18 for further detail.

[2] (1) March 31, 2015 balances have been restated from previously reported results to correct for material and certain other errors from prior periods. Refer to Notes 1 and 18 for further detail. See acc

[3] (1) March 31, 2015 balances have been restated from previously reported results to correct for material and certain other errors from prior periods. Refer to Notes 1 and 18 for further detail.

[4] (1) March 31, 2015 balances have been restated from previously reported results to correct for material and certain other errors from prior periods. Refer to Notes 1 and 18 for further detail.

[5] 1) March 31, 2015 balances have been restated from previously reported results to correct for material and certain other errors from prior periods. Refer to Notes 1 and 18 for further detail.