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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
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