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

Allocated specific reserves to modified TDRs.

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- Definition

Increase in trouble debt restructuring loans described.

+ References

No definition available.

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- Definition

Maturity date of receivables.

+ References

No definition available.

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- Definition

Number of days of default payment.

+ References

No definition available.

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- Definition

Previous maturity date of receivables.

+ References

No definition available.

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- Definition

Principal repayment of loans at date of modification.

+ References

No definition available.

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- Definition

Receivable interest rate stated percentage.

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No definition available.

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- Definition

Receivable previous interest rate stated percentage.

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No definition available.

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- Definition

Reduction in stated interest rate of loan.

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No definition available.

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- Definition

Trouble debt restructuring accrual financial receivables.

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- Definition

Trouble debt restructuring loans maturity date range end one.

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- Definition

Trouble debt restructuring loans maturity date range start one.

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- Definition

Reflects the carrying amount of loans deemed to be questionable as to collection on which no interest is continuing to be recognized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7

-Subparagraph (a)

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-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.

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- Definition

Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

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

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-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

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-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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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

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-Paragraph 1

-Subparagraph (SX 210.5-02.3)

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-Publisher SEC

-Name Regulation S-X (SX)

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-Section 02

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