Consolidated Statements of Cash Flows - Scenario, Unspecified [Domain] - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net income / (loss) before attribution of non-controlling interest	$ 83	$ (946)
Net (loss) / income attributable to non-controlling interest, net of taxes	(281)	(110)
Net Income (Loss) Attributable to Carver Bancorp, Inc.	364	(836)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Provision for (recovery of) loan losses	(3,010)	(426)
Pension plan termination cost	0	1,148
Stock based compensation expense	2	2
Depreciation and amortization expense	1,052	1,079
Gain on sale of securities, net	(8)	(552)
Gain on sale of loans, net	2	(1,319)
Market adjustment on held-for-sale loans	(28)	(231)
Proceeds from sale of loans held-for-sale	0	21,614
Assets repurchased from third parties	(174)	(2,116)
(Increase) decrease in accrued interest receivable	(224)	(310)
Amortization and accretion of loan premiums and discounts and deferred charges	(1,216)	(2,280)
Amortization and accretion of premiums and discounts - securities	(223)	176
(Increase) decrease in other assets	4,872	(207)
(Decrease) increase in other liabilities	2,143	(563)
Net cash provided by operating activities	3,833	15,546
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of securities: Available-for-sale	(28,200)	(35,180)
Proceeds from principal payments, maturities, calls and sales of securities: Available-for-sale	16,209	51,592
Proceeds from principal payments, maturities and calls of securities: Held-to-maturity	886	5,105
Originations of loans held-for-investment	(66,783)	(68,450)
Loans purchased from third parties	(87,292)	(54,459)
Principal collections on loans	(59,097)	(89,570)
Proceeds on sale of loans	0	398
Decrease (increase) in restricted cash	0	4,311
Redemption (purchase) of FHLB-NY stock	(418)	402
Purchase of premises and equipment	(289)	(305)
Proceeds from sale of real estate owned	0	1,727
Net cash (used in) provided by investing activities	(106,790)	(5,289)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase (decrease) in deposits	18,395	13,651
Net (decrease) increase in FHLB-NY advances and other borrowings	13,000	(6,000)
Net cash provided by (used in) by financing activities	31,395	7,651
Net increase in cash and cash equivalents	(71,562)	17,908
Cash and cash equivalents at beginning of period	122,554
Cash and cash equivalents at end of period	50,992	122,554
Noncash financing and investing activities
Transfer of loans held-for-investment to loans held-for-sale	0	12,717
Transfer into real estate owned	2,775	954
Cash paid for-
Interest	3,474	3,576
Income Taxes	161	130
Market adjustment on real estate owned	(216)	0
Gain (loss) on real estate owned	$ 5	$ (257)