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Employee Benefit and Stock Compensation Plans Carver Federal 's Plan asset allocation (Details)
Mar. 31, 2014
Mar. 31, 2013
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]    
Defined Benefit Plan, Actual Plan Asset Allocations 0.00% 100.00%
Equity Securities [Member]
   
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]    
Defined Benefit Plan, Actual Plan Asset Allocations 0.00% 61.00%
Debt Securities [Member]
   
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]    
Defined Benefit Plan, Actual Plan Asset Allocations 0.00% 39.00%