Mortgage Loans Held for Investment and Related Assets (Schedule of Mortgage Loan Portfolio) (Details) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2011	Apr. 30, 2010	Apr. 30, 2009	Apr. 30, 2008
Mortgage Loans Held For Investment And Related Assets
Adjustable-rate loans	$ 333,828	$ 411,122
Adjustable-rate loans, percent of total loans	58.00%	60.00%
Fixed-rate loans	239,146	272,562
Fixed-rate loans, percent of total loans	42.00%	40.00%
Total loans	572,974	683,684
Total loans, percent of total loans	100.00%	100.00%
Unamortized deferred fees and costs	4,121	5,256
Less: Allowance for loan losses	(92,087)	(93,535)	(84,073)	(45,401)
Total	$ 485,008	$ 595,405

Adjustable Rate Loans To Total Loans

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Fixed Rate Loans To Total Loans

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Mortgage Loans Held For Investment And Related Assets [Abstract]

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Total Loans To Total Loans

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The allowance for loan and lease losses represents the reserve to cover probable credit losses related to specifically identified loans and leases, as well as probable credit losses inherent in the remainder of the loan portfolio as of the balance sheet date. For banks, include currently required allocated transfer risk reserves. Include carryover of or adjustments to the allowance for loan losses in connection with business combinations determined to be appropriate.

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Reflects the aggregate gross carrying amount of all categories of loans and leases held in portfolio, prior to deducting deferred income and the allowance for losses on loans and leases.

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Reflects the aggregate carrying amount of all categories of loans and leases held in portfolio, net of unearned income and the allowance for losses on loans and leases.

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Reflects the carrying amount of loans charging borrowers fixed rates of interest.

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Reflects the carrying amount of loans charging borrowers variable, or adjustable, rates of interest.

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Reflects the cumulative amount of fees paid by borrowers which have not yet been taken into income and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield.

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