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Loans - Additional Information (Detail) (USD $) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2012 | Dec. 31, 2011
Debt Instrument [Line Items] |  |
Commercial loans | $ 122,940,000 | $ 151,160,000
Loans 90 days or more past due | 0 | 0
Allocated specific reserves to modified TDRs | 1,493 | 897
Principal repayment at the date of modification | 50 |
Maturity date start | May 31, 2012 |
Maturity date end | Sep. 30, 2012 |
Increase in ALLL due to TDRs described | 46 |
Number of days of default payment | 90 days |
Investments | 128,382,000 | 157,270,000
Accruing TDR's | 3,824 | 4,597
Commercial Lines Of Credit [Member] |  |
Debt Instrument [Line Items] |  |
Commercial loans | 9,376,000 | 12,472,000
Home Equity Line of Credit [Member] |  |
Debt Instrument [Line Items] |  |
Commercial loans | 10,524,000 | 12,739,000
Single-family residential [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum | 5.00% |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum | 10.00% |
Previous maturity date of Receivables | 2034 |
Maturity date of Receivables | 2042 |
Reduction in stated interest rate of loan | 30 years |
Investments | $ 15,425,000 | $ 18,214,000

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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 + Details
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