Note 7 - Loans and Allowance for Loan Losses (Details) - Individually Impaired Loans by Class of Loans - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Real Estate
Impaired loans, unpaid principal balance	$ 41,493	$ 47,033
Impaired loans, recorded investment with no allowance	11,161	15,644
Impaired loans, recorded investment with allowance	27,486	28,311
Impaired loans, total recorded investment	38,647	43,955
Impaired loans, allowance for loan losses allocated	2,801	3,371
Real Estate Portfolio Segment [Member] \| Real Estate Construction and Land Development [Member]
Real Estate
Impaired loans, unpaid principal balance	10,410	13,656
Impaired loans, recorded investment with no allowance	4,373	6,902
Impaired loans, recorded investment with allowance	3,379	3,917
Impaired loans, total recorded investment	7,752	10,819
Impaired loans, allowance for loan losses allocated	543	744
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Residential [Member]
Real Estate
Impaired loans, unpaid principal balance	9,304	10,256
Impaired loans, recorded investment with no allowance	2,588	3,473
Impaired loans, recorded investment with allowance	6,660	6,649
Impaired loans, total recorded investment	9,248	10,122
Impaired loans, allowance for loan losses allocated	1,149	1,172
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Farmland and Other Commercial Enterprises [Member]
Real Estate
Impaired loans, unpaid principal balance	21,182	23,003
Impaired loans, recorded investment with no allowance	4,200	5,247
Impaired loans, recorded investment with allowance	16,848	17,649
Impaired loans, total recorded investment	21,048	22,896
Impaired loans, allowance for loan losses allocated	687	1,359
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member]
Real Estate
Impaired loans, unpaid principal balance	436	93
Impaired loans, recorded investment with no allowance	0	22
Impaired loans, recorded investment with allowance	438	71
Impaired loans, total recorded investment	438	93
Impaired loans, allowance for loan losses allocated	261	71
Consumer Portfolio Segment [Member] \| Consumer Unsecured [Member]
Real Estate
Impaired loans, unpaid principal balance	161	25
Impaired loans, recorded investment with no allowance	0	0
Impaired loans, recorded investment with allowance	161	25
Impaired loans, total recorded investment	161	25
Impaired loans, allowance for loan losses allocated	$ 161	$ 25

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- Definition

Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 14A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953550-111524

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Amount of allowance for credit losses related to recorded investment.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524

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+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (a)(4)

-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524

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