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Foreclosed Assets - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |  | 1 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Commercial [Member] Property | Dec. 31, 2011 Commercial [Member] Property | Sep. 30, 2012 Commercial Real Estate [Member] | Dec. 31, 2012 Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |
Valuation allowance was established on one of the commercial real estate properties |  | $ 1,139 |  |  |  |  |
Number of properties |  |  |  | 3 | 1 |  |
Written down value of foreclosed assets |  |  |  |  |  | 447 |
Net gain from sale of foreclosed assets | $ 1,720 | $ 1,000 |  |  |  |  | $ 288

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- Definition Loans Receivable Held For Sale Valuation Allowance Written Down. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Number of properties. + References No definition available. + Details
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- Definition Valuation allowance on foreclosed asset. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Details
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- Definition The cash inflow from the sale assets received in full or partial satisfaction of a receivable including real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts. Foreclosed assets also include loans that are treated as if the underlying collateral had been foreclosed because the institution has taken possession of the collateral, even though legal foreclosure or repossession proceedings have not taken place. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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