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Mortgage Loans Held For Investment And Related Assets (Schedule Of Allowance For Loan Losses) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Jul. 31, 2014
Jul. 31, 2013
Loans and Leases Rollforward [Roll Forward]    
Balance at beginning of the period $ 11,272 $ 14,314
Provision 725 7,603
Recoveries 679 767
Charge-offs (2,115) (7,170)
Balance at end of the period $ 10,561 $ 15,514