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Changes of Unamortized Discount and Designated Credit Reserves on Residential Available for Sale Securities (Detail) (Residential, USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014
Residential
Credit Reserve
Beginning balance	$ 83,276	$ 116,870
Amortization of net discount
Realized credit losses	(1,692)	(9,002)
Acquisitions	1,589	1,846
Sales, calls, other	(1,013)	(2,425)
Impairments	188	565
Transfers to (release of) credit reserves, net	(8,473)	(33,979)
Ending Balance	73,875	73,875
Unamortized Discount Net
Beginning balance	304,293	298,469
Amortization of net discount	(10,890)	(32,774)
Realized credit losses
Acquisitions	4,404	7,241
Sales, calls, other	(7,175)	(7,810)
Impairments
Transfers to (release of) credit reserves, net	8,473	33,979
Ending Balance	$ 299,105	$ 299,105

X

- Definition

Balance of credit reserve on available-for-sale securities.

+ References

No definition available.

+ Details

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X

- Definition

Changes to the credit reserve on available-for-sale securities due to security acquisitions.

+ References

No definition available.

+ Details

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X

- Definition

Changes to credit reserve on available-for-sale securities due to the amortization of net discount

+ References

No definition available.

+ Details

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X

- Definition

Changes to the credit reserve on available-for-sale securities due to impairments.

+ References

No definition available.

+ Details

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- Definition

Changes to the credit reserve on available-for-sale securities due to realized credit losses.

+ References

No definition available.

+ Details

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- Definition

Changes to the credit reserve on available-for-sale securities due to sales, calls, and other items.

+ References

No definition available.

+ Details

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X

- Definition

Transfers to or releases of the credit reserve on available-for-sale securities.

+ References

No definition available.

+ Details

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- Definition

Balance of net unamortized discount on available-for-sale securities.

+ References

No definition available.

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- Definition

Changes to the net unamortized discount on available-for-sale securities due to security acquisitions.

+ References

No definition available.

+ Details

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- Definition

Changes to the net unamortized discount on available-for-sale securities due to the amortization of net discount.

+ References

No definition available.

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- Definition

Changes to the net unamortized discount on available-for-sale securities due to impairments.

+ References

No definition available.

+ Details

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- Definition

Changes to the net unamortized discount on available-for-sale securities due to realized credit losses.

+ References

No definition available.

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X

- Definition

Changes to the net unamortized discount on available-for-sale securities due to sales, calls, and other items.

+ References

No definition available.

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- Definition

Transfers to or releases of the credit reserve on available-for-sale securities.

+ References

No definition available.

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