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Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended							12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Earnings (Loss) Per Common Share [Abstract]
Net (loss) / income attributable to Carver Bancorp, Inc.	$ (126)	$ 111	$ 210	$ 169	$ (769)	$ 342	$ 414	$ 364	$ (836)	$ 662
Dividends, Preferred Stock								0	0	0
Net Income (Loss) available to common shareholders								$ 364	$ (836)	$ 662
Weighted Average Number of Shares Outstanding, Basic								3,696,359	3,696,149	3,695,625
Weighted Average Number Diluted Shares Outstanding Adjustment								253	507	1,775
Weighted Average Number of Common Shares Outstanding, Diluted								3,696,612	3,696,656	3,697,400
Earnings Per Share, Basic	$ (0.03)	$ 0.03	$ 0.06	$ 0.05	$ (0.21)	$ 0.09	$ 0.11	$ 0.10	$ (0.23)	$ 0.18
Earnings Per Share, Diluted	$ (0.03)	$ 0.03	$ 0.06	$ 0.05	$ (0.21)	$ 0.09	$ 0.11	$ 0.10	$ (0.23)	$ 0.18

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Earnings (Loss) Per Common Share [Abstract]

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Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK).

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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