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Variable Interest Entities Text Tag (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2010
Mar. 31, 2007
Mar. 31, 2022
Mar. 31, 2021
Entity Information [Line Items]            
% of Carver Statutory Trust I owned 100.00%          
New Markets Tax Credit Award   $ 25,000 $ 65,000 $ 59,000    
Accrued interest expense subordinated debt         $ 22 $ 3,100
Carver Statutory Trust 1            
Entity Information [Line Items]            
Variable Interest Entity, Funded Exposure, Debt Investment $ 13,000       13,022  
Variable Interest Entity, Funded Exposure, Equity Invesment $ 400       $ 403