Other-Than-Temporary Impairment (Price Recovery) (Details)	Sep. 30, 2012
Maximum [Member]
Other than Temporary Impairment, Disclosure [Line Items]
1 - 6	2.80%
7 - 18	3.00%
19 - 24	4.00%
25 - 30	4.00%
31 - 42	5.00%
43 - 66	6.00%
Thereafter	5.60%
Minimum [Member]
Other than Temporary Impairment, Disclosure [Line Items]
1 - 6	0.00%
7 - 18	0.00%
19 - 24	1.00%
25 - 30	2.00%
31 - 42	2.00%
43 - 66	2.00%
Thereafter	2.30%

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The projected home price recovery percent, forty three to sixty six months after balance sheet reporting date.

No definition available.

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The projected home price recovery percent, after month sixty six.

No definition available.

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The projected home price recovery percent, nineteen to twenty four months after balance sheet reporting date.

No definition available.

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The projected home price recovery percent, one to six months after balance sheet reporting date.

No definition available.

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The projected home price recovery percent, seven to eighteen months after balance sheet reporting date.

No definition available.

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The projected home price recovery percent, thirty one to forty two months after balance sheet reporting date.

No definition available.

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The projected home price recovery percent, twenty five to thirty months after balance sheet reporting date.

No definition available.

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