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Mortgage Loans Held for Investment and Related Assets (Schedule of Portfolio Balance) (Details) (USD $)
In Thousands
Apr. 30, 2011
Apr. 30, 2010
Portfolio balance $ 572,974 $ 683,684
Related allowance 92,087 93,535
Pooled (Less Than 60 Days Past Due) [Member]
   
Portfolio balance 304,325 372,823
Related allowance 11,238 15,924
Individually (TDRs) [Member]
   
Portfolio balance 106,328 144,977
Related allowance 11,056 8,915
Individually (60 Days or More Past Due) [Member]
   
Portfolio balance 162,321 165,884
Related allowance $ 69,793 $ 68,696