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Mortgage Loans Held For Investment And Related Assets (Schedule Of Credit Quality Indicators) (Details) (USD $)
In Thousands, unless otherwise specified
Jan. 31, 2014
Apr. 30, 2013
Jan. 31, 2013
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio $ 291,325 $ 350,235 $ 372,139
Occupancy Status, Owner Occupied
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 203,362    
Occupancy Status, Non-Owner Occupied
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 87,963    
Documentation Level, Full Documentation
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 145,822    
Documentation Level, Limited Documentation
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 18,340    
Documentation Level, Stated Income
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 105,061    
Documentation Level, No Documentation
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 22,102    
Internal Risk Rating, High
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 49,226    
Internal Risk Rating, Medium
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 117,039    
Internal Risk Rating, Low
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 125,060    
Purchased From SCC
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 166,265    
Purchased From SCC | Occupancy Status, Owner Occupied
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 121,743    
Purchased From SCC | Occupancy Status, Non-Owner Occupied
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 44,522    
Purchased From SCC | Documentation Level, Full Documentation
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 55,477    
Purchased From SCC | Documentation Level, Limited Documentation
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 5,059    
Purchased From SCC | Documentation Level, Stated Income
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 91,796    
Purchased From SCC | Documentation Level, No Documentation
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 13,933    
Purchased From SCC | Internal Risk Rating, High
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 49,226    
Purchased From SCC | Internal Risk Rating, Medium
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 117,039    
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 125,060    
All Other | Occupancy Status, Owner Occupied
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 81,619    
All Other | Occupancy Status, Non-Owner Occupied
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 43,441    
All Other | Documentation Level, Full Documentation
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 90,345    
All Other | Documentation Level, Limited Documentation
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 13,281    
All Other | Documentation Level, Stated Income
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 13,265    
All Other | Documentation Level, No Documentation
      
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Total Portfolio 8,169    
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 $ 125,060