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Mortgage Loans Held For Investment And Related Assets (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Apr. 30, 2013
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Transfer of mortgage loans held for investment to held for sale $ 7,608 $ 0  
Allowance as Percent of Principal 4.00% 4.60% 4.10%
Percentage of mortgage loan portfolio consisting of borrowers from Florida, California, New York, and Wisconsin 59.00%    
Minimum Credit Score
     
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Loan-to-value at origination in order to have internal risk rating of medium 80.00%    
Minimum credit score to be given internal risk rating of low 700    
Maximum Credit Score
     
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Loan-to-value at origination in order to have internal risk rating of medium 80.00%    
Maximum credit score to be given internal risk rating of medium 700    
Maximum [Member]
     
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Allowance for Credit Losses, Period at Which Collectively Evaluated for Impairment 60 days    
Minimum [Member]
     
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Allowance for Credit Losses, Period at Which Indivudally Evaluated for Impairment 60 days    
Fair Value, Measurements, Recurring [Member] | Mortgage Loans Held for Sale [Member]
     
Mortgage Loans Held For Investment And Related Assets [Line Items]      
Gain (Loss) on Investments $ 2,900