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Aggregate Contractual or Notional Amounts of Derivative Financial Instruments (Detail) (IRLCs, Derivatives not designated as hedges, USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
IRLCs | Derivatives not designated as hedges
Aggregate contractual or notional amounts of derivative financial instruments
Notional Amount	$ 14,841	$ 9,155

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

+ Details

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Details

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