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Employee Benefit and Stock Compensation Plans Plan Assets held by Carver Federal Plan (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Mar. 31, 2013
Defined Benefit Plan Disclosure [Line Items] |
Plan Assets Large Cap | $ 2,023
Fair Value, Inputs, Level 1 [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Plan Assets Large Cap | 0
Fair Value, Inputs, Level 2 [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Plan Assets Large Cap | 2,023
Fair Value, Inputs, Level 3 [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Plan Assets Large Cap | $ 0

X
- Definition Plan Assets Large Cap + References No definition available. + Details
Name: | carv_PlanAssetsLargeCap
Namespace Prefix: | carv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration