Portfolio Quality Indicators (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Recorded Investment [Line Items]
Commercial	$ 47,130	$ 35,387
Commercial Real Estate	144,144	148,052
Residential	73,623	61,765
Installment	31,585	39,243
Total	296,482	284,447
Pass Grade
Financing Receivable, Recorded Investment [Line Items]
Commercial	43,364	31,320
Commercial Real Estate	133,402	133,949
Residential	73,623	61,590
Installment	31,585	39,161
Total	281,974	266,020
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Commercial	2,698	2,930
Commercial Real Estate	3,005	3,500
Residential	0	175
Installment	0	5
Total	5,703	6,610
Substandard
Financing Receivable, Recorded Investment [Line Items]
Commercial	1,068	882
Commercial Real Estate	7,737	6,924
Residential	0	0
Installment	0	77
Total	8,805	7,883
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Commercial	0	255
Commercial Real Estate	0	3,679
Residential	0	0
Installment	0	0
Total	$ 0	$ 3,934

Amount before allowance of commercial loans and leases receivable includes, but not limited to, commercial and industrial loans, agricultural loans, mortgage loans, promissory notes, interbank and other loans to financial institutions, draws against credit facilities, trade financing, lease financings. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References+ Details

Amount before allowance of installment and revolving loans issued to individuals, including, but not limited to credit card, automobile, boat, student, durable home appliance loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

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

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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+ Details

- Definition

Amount before allowance of commercial loans issued to businesses to acquire, develop, construct, improve, or refinance land or building. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

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-Article 9

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Subparagraph (SX 210.9-03.7(a))

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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+ Details