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Note 8 - Loans and Related Allowance for Loan and Lease Losses - Additional Information on Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Average recorded investment	$ 13,659	$ 14,683	$ 13,385	$ 14,258
Interest income recognized	87	181	176	375
Commercial And Industrial [Member]
Average recorded investment	4,277	2,228	3,644	1,889
Interest income recognized	23	57	47	141
Real Estate Construction Porfolio Segment [Member]
Average recorded investment	142	676	283	877
Interest income recognized		1		1
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Average recorded investment	2,772	3,131	2,871	3,264
Interest income recognized	13	28	27	50
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member]
Average recorded investment	6,464	8,643	6,583	8,223
Interest income recognized	51	95	102	183
Consumer Portfolio Segment [Member]
Average recorded investment	4	5	4	5
Interest income recognized

X

- Definition

Average 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524

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X

- Definition

Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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