Mortgage Loans Held For Investment And Related Assets (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Apr. 30, 2014
Mortgage Loans Held For Investment And Related Assets [Line Items]
Transfer of mortgage loans held for investment to held for sale	$ 0	$ 7,608
Allowance as Percent of Principal	3.90%	4.80%	4.10%
Percentage of mortgage loan portfolio consisting of borrowers from Florida, California, New York, and Wisconsin	51.00%
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