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Note 5 - Loans and Allowance for Loan Losses - Troubled Debt Restructurings, Excluding Loans Acquired, Segregated by Class of Loans (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Troubled debt, number	16	70
Commercial Real Estate Portfolio Segment [Member]
Troubled debt, number	5	51
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Troubled debt, number	1
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member]
Troubled debt, number	1	23
Commercial Real Estate Portfolio Segment [Member] | Commercial Loans [Member]
Troubled debt, number	11
Commercial Portfolio Segment [Member]
Troubled debt, number	11	17
Commercial Portfolio Segment [Member] | Commercial Loans [Member]
Troubled debt, number		17
Consumer Portfolio Segment [Member]
Troubled debt, number		2
Consumer Portfolio Segment [Member] | Other Loans [Member]
Troubled debt, number		2
Loans, Excluding Acquired Loans [Member]
Troubled debt, number	40	79
Troubled debt, balance	$ 12,938	$ 14,174
Loans, Excluding Acquired Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Troubled debt, number	29	58
Troubled debt, balance	$ 9,549	$ 12,091
Loans, Excluding Acquired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Troubled debt, number	1	1
Troubled debt, balance	$ 420	$ 18
Loans, Excluding Acquired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member]
Troubled debt, number	19	32
Troubled debt, balance	$ 1,095	$ 2,245
Loans, Excluding Acquired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Other Loans [Member]
Troubled debt, number	9	25
Troubled debt, balance	$ 8,034	$ 9,828
Loans, Excluding Acquired Loans [Member] | Commercial Portfolio Segment [Member]
Troubled debt, number	11	20
Troubled debt, balance	$ 3,389	$ 2,080
Loans, Excluding Acquired Loans [Member] | Commercial Portfolio Segment [Member] | Commercial Loans [Member]
Troubled debt, number	11	20
Troubled debt, balance	$ 3,389	$ 2,080
Loans, Excluding Acquired Loans [Member] | Consumer Portfolio Segment [Member]
Troubled debt, number		1
Troubled debt, balance		$ 3
Loans, Excluding Acquired Loans [Member] | Consumer Portfolio Segment [Member] | Other Loans [Member]
Troubled debt, number		1
Troubled debt, balance		$ 3
Loans, Excluding Acquired Loans [Member] | Performing Financial Instruments [Member]
Troubled debt, number	13	41
Troubled debt, balance	$ 7,107	$ 10,998
Loans, Excluding Acquired Loans [Member] | Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member]
Troubled debt, number	8	26
Troubled debt, balance	$ 4,463	$ 9,215
Loans, Excluding Acquired Loans [Member] | Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Troubled debt, number
Troubled debt, balance
Loans, Excluding Acquired Loans [Member] | Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member]
Troubled debt, number	4	3
Troubled debt, balance	$ 141	$ 167
Loans, Excluding Acquired Loans [Member] | Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Other Loans [Member]
Troubled debt, number	4	23
Troubled debt, balance	$ 4,322	$ 9,048
Loans, Excluding Acquired Loans [Member] | Performing Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Troubled debt, number	5	15
Troubled debt, balance	$ 2,644	$ 1,783
Loans, Excluding Acquired Loans [Member] | Performing Financial Instruments [Member] | Commercial Portfolio Segment [Member] | Commercial Loans [Member]
Troubled debt, number	5	15
Troubled debt, balance	$ 2,644	$ 1,783
Loans, Excluding Acquired Loans [Member] | Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member]
Troubled debt, number
Troubled debt, balance
Loans, Excluding Acquired Loans [Member] | Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Other Loans [Member]
Troubled debt, number
Troubled debt, balance
Loans, Excluding Acquired Loans [Member] | Nonperforming Financial Instruments [Member]
Troubled debt, number	27	38
Troubled debt, balance	$ 5,831	$ 3,176
Loans, Excluding Acquired Loans [Member] | Nonperforming Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member]
Troubled debt, number	21	32
Troubled debt, balance	$ 5,086	$ 2,876
Loans, Excluding Acquired Loans [Member] | Nonperforming Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Troubled debt, number	1	1
Troubled debt, balance	$ 420	$ 18
Loans, Excluding Acquired Loans [Member] | Nonperforming Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member]
Troubled debt, number	15	29
Troubled debt, balance	$ 954	$ 2,078
Loans, Excluding Acquired Loans [Member] | Nonperforming Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Other Loans [Member]
Troubled debt, number	5	2
Troubled debt, balance	$ 3,712	$ 780
Loans, Excluding Acquired Loans [Member] | Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Troubled debt, number	6	5
Troubled debt, balance	$ 745	$ 297
Loans, Excluding Acquired Loans [Member] | Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member] | Commercial Loans [Member]
Troubled debt, number	6	5
Troubled debt, balance	$ 745	$ 297
Loans, Excluding Acquired Loans [Member] | Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member]
Troubled debt, number		1
Troubled debt, balance		$ 3
Loans, Excluding Acquired Loans [Member] | Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Other Loans [Member]
Troubled debt, number		1
Troubled debt, balance		$ 3

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

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554

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