Carver Bancorp Inc.-Parent Company Only Parent Company Statement of Financial Condition (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011	Dec. 30, 2010	Mar. 31, 2010
Cash				$ 6,700
Other Assets	11,284	10,271
Total assets	638,277	641,230
Borrowed Funds	76,403	43,429
Other Liabilities	9,423	8,585
Liabilities	581,542	584,611
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	56,735	56,619	27,717		61,686
Total liabilities and stockholders’ equity	638,277	641,230
Parent Company [Member]
Cash	4,654	4,775
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	66,660	65,648
Other Assets	48	39
Total assets	71,362	70,462
Borrowed Funds	13,403	13,403
Accounts Payable	1,180	311
Other Liabilities	44	129
Liabilities	14,627	13,843
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	56,735	56,619
Total liabilities and stockholders’ equity	$ 71,362	$ 70,462