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Mortgage Loans Held For Investment And Related Assets (Schedule Of Credit Quality Indicators) (Details) (USD $)
In Thousands, unless otherwise specified
Jul. 31, 2013
Apr. 30, 2013
Jul. 31, 2012
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio $ 322,454 $ 350,235 $ 405,670
Occupancy Status, Owner Occupied
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 223,423    
Occupancy Status, Non-Owner Occupied
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 99,031    
Documentation Level, Full Documentation
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 162,052    
Documentation Level, Limited Documentation
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 20,201    
Documentation Level, Stated Income
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 116,438    
Documentation Level, No Documentation
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 23,763    
Internal Risk Rating, High
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 56,475    
Internal Risk Rating, Medium
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 127,076    
Internal Risk Rating, Low
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 138,903    
Purchased From SCC
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 183,551    
Purchased From SCC | Occupancy Status, Owner Occupied
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 134,582    
Purchased From SCC | Occupancy Status, Non-Owner Occupied
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 48,969    
Purchased From SCC | Documentation Level, Full Documentation
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 60,826    
Purchased From SCC | Documentation Level, Limited Documentation
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 6,069    
Purchased From SCC | Documentation Level, Stated Income
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 101,995    
Purchased From SCC | Documentation Level, No Documentation
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 14,661    
Purchased From SCC | Internal Risk Rating, High
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 56,475    
Purchased From SCC | Internal Risk Rating, Medium
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 127,076    
Purchased From SCC | Internal Risk Rating, Low
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio       
All Other
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 138,903    
All Other | Occupancy Status, Owner Occupied
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 88,841    
All Other | Occupancy Status, Non-Owner Occupied
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 50,062    
All Other | Documentation Level, Full Documentation
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 101,226    
All Other | Documentation Level, Limited Documentation
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 14,132    
All Other | Documentation Level, Stated Income
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 14,443    
All Other | Documentation Level, No Documentation
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 9,102    
All Other | Internal Risk Rating, High
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio       
All Other | Internal Risk Rating, Medium
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio       
All Other | Internal Risk Rating, Low
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio $ 138,903