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Note 4 - Loans and Allowance for Loan Losses - TDRs Pre-modification and Post-modification (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)
Number of loans	1	0	4
Performing Financial Instruments [Member]
Pre-modification recorded investment	$ 412		$ 1,413
Post-modification recorded investment	412		1,413
Nonperforming Financial Instruments [Member]
Pre-modification recorded investment
Post-modification recorded investment
Residential Portfolio Segment [Member]
Number of loans			1
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member]
Pre-modification recorded investment			$ 231
Post-modification recorded investment			231
Residential Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Pre-modification recorded investment
Post-modification recorded investment
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member]
Number of loans				2
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member] | Interest Rate Below Market Reduction [Member]
Number of loans	1		1	1
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member] | Interest Only Payments [Member]
Number of loans				1
Commercial Real Estate Portfolio Segment [Member] | Performing Financial Instruments [Member] | Commercial Real Estate Nonowner Occupied [Member]
Pre-modification recorded investment				$ 574
Post-modification recorded investment				574
Commercial Real Estate Portfolio Segment [Member] | Performing Financial Instruments [Member] | Commercial Real Estate Nonowner Occupied [Member] | Interest Rate Below Market Reduction [Member]
Pre-modification recorded investment	$ 412		$ 412	574
Post-modification recorded investment	412		412	574
Commercial Real Estate Portfolio Segment [Member] | Performing Financial Instruments [Member] | Commercial Real Estate Nonowner Occupied [Member] | Interest Only Payments [Member]
Pre-modification recorded investment
Post-modification recorded investment
Commercial Real Estate Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Commercial Real Estate Nonowner Occupied [Member]
Pre-modification recorded investment				226
Post-modification recorded investment				226
Commercial Real Estate Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Commercial Real Estate Nonowner Occupied [Member] | Interest Rate Below Market Reduction [Member]
Pre-modification recorded investment
Post-modification recorded investment
Commercial Real Estate Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Commercial Real Estate Nonowner Occupied [Member] | Interest Only Payments [Member]
Pre-modification recorded investment				226
Post-modification recorded investment				$ 226
Commercial and Industrial Portfolio Segment [Member]
Number of loans			2
Commercial and Industrial Portfolio Segment [Member] | Performing Financial Instruments [Member]
Pre-modification recorded investment			$ 770
Post-modification recorded investment			770
Commercial and Industrial Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Pre-modification recorded investment
Post-modification recorded investment

X

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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- Definition

Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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X

- Definition

Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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