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Off-Balance-Sheet Financial Instruments, Notional Amount (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Commitments to extend credit |  |
Derivative [Line Items] |  |
Notional Amount | $ 194,916 | $ 154,323
Standby letters of credit |  |
Derivative [Line Items] |  |
Notional Amount | 11,321 | 11,113
Commercial letters of credit |  |
Derivative [Line Items] |  |
Notional Amount | $ 8,982 | $ 8,991

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- 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

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- Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration