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Amortized Cost, Fair Value, and Weighted-Average Yield of Securities by Contractual Maturity (Parenthetical) (Detail)	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Fully taxable equivalent at rate	35.00%

X

- Definition

Computation of Average Yield of Securities, Tax Equivalent Basis Rate

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration