Consolidated Statement of Changes in Stockholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Noncontrolling Interest [Member]	Accumulated deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Equity at Mar. 31, 2014	$ 51,169	$ 45,118	$ 61	$ 56,114	$ (417)	$ (369)	$ (44,570)	$ (4,768)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to Carver Bancorp, Inc.	491	0	0	0	0	0		0
Other comprehensive loss, net of taxes	2,809	0	0	0	0	0	0
Net income (loss) attributable to noncontrolling interest	(281)	0	0	0	0	(281)	0	0
Stock based compensation expense	2	0	0	2	0	0	0	0
Equity at Dec. 31, 2014	$ 54,190	$ 45,118	$ 61	$ 56,116	$ (417)	$ (650)	$ (44,079)	$ (1,959)