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Variable Interest Entities Text Tag (Details) (USD $) | 6 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2011 | Dec. 30, 2010 | May 15, 2009 | Apr. 28, 2006 | Sep. 30, 2013 Carver Statutory Trust 1 [Member] | Sep. 30, 2013 CDE 10 [Member] | Sep. 30, 2013 CDE 1-9, CDE 11-12 [Member] | Dec. 31, 2010 CDE 1-9, CDE 11-12 [Member]
Entity Information [Line Items] |  |  |  |  |  |  |  |  |
Variable Interest Entity, Funded Exposure, Debt Investment | $ 13,000,000 |  |  |  |  | $ 13,000,000 | $ 0 | $ 0 |
Variable Interest Entity, Funded Exposure, Equity Invesment | 0 |  |  |  |  | 400,000 | 0 | 0 |
% of Carver Statutory Trust I owned | 100.00% |  |  |  |  |  |  |  |
Cash |  |  | 6,700,000 |  |  |  |  |  |
New Market Tax Credit Award |  | 25,000,000 |  | 65,000,000 | 59,000,000 |  |  |  |
Variable Interest Entity, Rights Transferred | 149,000,000 |  |  | 40,000,000 |  | 0 | 19,000,000 | 40,000,000 |
Stockholders' Equity Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  | $ 6,700,000

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- Definition New Market Tax Credit Award + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition % of Carver Statutory Trust I owned + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Variable Interest Entity, Funded Exposure, Debt Investment + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Variable Interest Entity, Funded Exposure, Equity Invesment + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Variable Interest Entity, Rights Transferred + References No definition available. + Details
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Namespace Prefix: | carv_
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Balance Type: | debit
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- Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7 -Footnote 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 + Details
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- Definition Carrying amount of the equity interests owned by noncontrolling partners of a limited partnership included in the entity's consolidated financial statements. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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