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Note 4 - Loans And Related Allowance For Loan Losses (Detail) - Troubled Debt Restructurings That Subsequently Defaulted (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Commercial and Industrial [Member]
Number of Contracts	6	3	2
Recorded Investment (in Dollars)	$ 256	$ 134	$ 174
Real Estate Construction [Member]
Number of Contracts	1	0
Recorded Investment (in Dollars)	3,622	0
Residential Real Estate Mortgage [Member]
Number of Contracts	2	0	3
Recorded Investment (in Dollars)	89	0	203
Commercial Real Estate Mortgage [Member]
Number of Contracts	0		0
Recorded Investment (in Dollars)	0		0
Consumer Installment [Member]
Number of Contracts	1	2	0
Recorded Investment (in Dollars)	$ 5	$ 28	$ 0

X

- Definition

Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 34

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953682-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 34

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953682-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant