Fair Value (Quantitative Information About Level 3 Fair Value Measurements) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
Jan. 31, 2015
Collateral-Based \| Impaired Mortgage Loans Held For Investment - Non TDRs
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Time to sell (in months)	24 months
Collateral-Based \| Impaired Mortgage Loans Held For Investment - TDRs
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	34,699
Collateral-Based \| Minimum \| Impaired Mortgage Loans Held For Investment - Non TDRs
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Cost to list/sell	0.00%
Loss severity	0.00%
Collateral depreciation	(166.00%)
Collateral-Based \| Maximum \| Impaired Mortgage Loans Held For Investment - Non TDRs
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Cost to list/sell	193.00%
Loss severity	100.00%
Collateral depreciation	100.00%
Collateral-Based \| Weighted Average \| Impaired Mortgage Loans Held For Investment - Non TDRs
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Cost to list/sell	10.00%
Loss severity	61.00%
Time to sell (in months)	24 months
Collateral depreciation	38.00%
Discounted Cash Flow \| Impaired Mortgage Loans Held For Investment - Non TDRs
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	68,376
Discounted Cash Flow \| Minimum \| Impaired Mortgage Loans Held For Investment - TDRs
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loss severity	0.00%
Aged default performance	23.00%
Discounted Cash Flow \| Maximum \| Impaired Mortgage Loans Held For Investment - TDRs
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loss severity	23.00%
Aged default performance	37.00%
Discounted Cash Flow \| Weighted Average \| Impaired Mortgage Loans Held For Investment - TDRs
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loss severity	6.00%
Aged default performance	30.00%

Collateral Depreciation

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- Definition

Fair Value Inputs, Cost to list/sell

+ References

No definition available.

+ Details

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- Definition

Fair Value Inputs, Time to sell

+ References

No definition available.

+ Details

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

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- Definition

Loss, including interest and principal, incurred on a defaulted security, expressed as a percentage of the original principal balance, used as an input to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

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- Definition

Percentage of likelihood a loan will not be repaid and instead default, used as an input to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

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