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Note 4 - Loans and Allowance for Loan Losses - Allowance for Loan Losses Activity by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Balance	$ 7,639	$ 6,952	$ 7,499	$ 7,699
Provision for loan losses	962	1,601	1,695	1,921
Loans charged off	(1,042)	(1,501)	(2,380)	(3,367)
Recoveries	756	261	1,501	1,060
Balance	8,315	7,313	8,315	7,313
Residential Portfolio Segment [Member]
Balance	1,886	1,300	1,470	939
Provision for loan losses	681	493	1,261	870
Loans charged off	(184)	(445)	(421)	(591)
Recoveries	49	83	122	213
Balance	2,432	1,431	2,432	1,431
Commercial Real Estate Portfolio Segment [Member]
Balance	2,392	2,813	2,978	4,315
Provision for loan losses	(378)	540	(1,041)	(636)
Loans charged off		(434)	(1)	(1,046)
Recoveries	431	41	509	327
Balance	2,445	2,960	2,445	2,960
Commercial and Industrial Portfolio Segment [Member]
Balance	1,242	932	1,024	907
Provision for loan losses	197	238	196	588
Loans charged off	(136)	(202)	(140)	(605)
Recoveries	80	4	303	82
Balance	1,383	972	1,383	972
Consumer Portfolio Segment [Member]
Balance	2,119	1,907	2,027	1,538
Provision for loan losses	462	330	1,279	1,099
Loans charged off	(722)	(420)	(1,818)	(1,125)
Recoveries	196	133	567	438
Balance	$ 2,055	$ 1,950	$ 2,055	$ 1,950

X

- Definition

A valuation allowance for financing receivables that are expected to be uncollectible.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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X

- Definition

Amount of recovery of financing receivables doubtful of collection that were previously charged off.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(4)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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- Definition

Amount of direct write-downs of financing receivables charged against the allowance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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X

- Definition

Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.11)
-URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

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