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Variable Interest Entities Text Tag (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2013
Mar. 31, 2015
Sep. 30, 2011
Dec. 31, 2010
Dec. 30, 2010
May. 15, 2009
Mar. 31, 2008
Apr. 28, 2006
Entity Information [Line Items]                
Variable Interest Entity, Funded Exposure, Debt Investment   $ 13,000            
Variable Interest Entity, Funded Exposure, Equity Invesment [1]   0            
% of Carver Statutory Trust I owned 100.00%              
Cash         $ 6,700      
New Markets Tax Credit Award     $ 25,000     $ 65,000   $ 59,000
Variable Interest Entity, Rights Transferred   149,000       $ 40,000    
Carver Statutory Trust 1 [Member]                
Entity Information [Line Items]                
Variable Interest Entity, Funded Exposure, Debt Investment $ 13,000 13,000            
Variable Interest Entity, Funded Exposure, Equity Invesment $ 400 400 [1]            
Variable Interest Entity, Rights Transferred   0            
CDE 10 [Member]                
Entity Information [Line Items]                
Variable Interest Entity, Funded Exposure, Debt Investment   0            
Variable Interest Entity, Funded Exposure, Equity Invesment [1]   0            
Variable Interest Entity, Rights Transferred   19,000         $ 19,000  
CDE 1-9, CDE 11-12 [Member]                
Entity Information [Line Items]                
Variable Interest Entity, Funded Exposure, Debt Investment   0            
Variable Interest Entity, Funded Exposure, Equity Invesment [1]   0            
Variable Interest Entity, Rights Transferred   $ 40,000            
Stockholders' Equity Attributable to Noncontrolling Interest       $ 6,700        
[1] (1) Excludes any proceeds realized from exchange of equity interest in CDEs as detailed below.