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Note 4 - Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Amortized cost, Due in one year or less, available for sale securities	$ 5,260
Fair value, Due in one year or less, available for sale securities	5,256
Amortized cost, Due after one year through five years, available for sale securities	209,331
Fair value, Due after one year through five years, available for sale securities	207,524
Amortized cost, Due after five years through ten years, available for sale securties	69,853
Fair value, Due after five years through ten years, available for sale securities	69,207
Amortized cost, Due after ten years, available for sale securities	25,167
Fair value, Due after ten years, available for sale securities	26,256
Amortized cost, No maturity, available for sale securities	189
Fair value, No maturity, available for sale securities	192
Amortized cost, Total securities available for sale	309,800
Securities available for sale	308,435	$ 304,282
Amortized cost, Due in one year or less, held to maturity securities	7,291
Fair value, Due in one year or less, held to maturity securities	7,434
Amortized cost, Due after one year through five years, held to maturity securities	28,071
Fair value, Due after one year through five years, held to maturity securities	29,623
Amortized cost, Due after five years through ten years, held to maturity securities	22,723
Fair value, Due after give years through ten years, held to maturity securities	23,633
Amortized cost, Due after ten years, held to maturity securities	72,627
Fair value, Due after ten years, held to maturity securities	74,607
Amortized cost, Total securities held to maturity	130,712	134,957
Securities held to maturity, fair value	$ 135,297	$ 137,692

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Fair value of held-to-maturity debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (f)(1)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

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Period Type:	instant

X

- Definition

Carrying amount of debt securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized, and fair value hedge accounting adjustments, maturing in the next fiscal year following the latest fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (f)(1)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Fair value of investments in debt securities classified as held-to-maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

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