Carver Bancorp Inc.-Parent Company Only Parent Company Statements of Financial Condition (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011	Dec. 30, 2010
Cash					$ 6,700
Other assets	11,218	11,284
Total assets	639,838	638,277
Borrowed Funds	70,403	76,403
Other liabilities	8,900	9,423
Total liabilities	588,669	581,542
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	51,169	56,735	56,619	27,717
Total liabilities and equity	639,838	638,277
Parent Company [Member]
Cash	4,669	4,654	4,775	16
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	62,310	66,660
Other assets	70	48
Total assets	67,049	71,362
Borrowed Funds	13,403	13,403
Accounts payable to subsidiaries	878	456
Other liabilities	1,230	768
Total liabilities	15,511	14,627
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	51,538	56,735
Total liabilities and equity	$ 67,049	$ 71,362