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Note 5 - Investment Securities - Investments' Gross Unrealized Losses and Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
US Government Agencies Debt Securities [Member]
Available-for-Sale, Less than 12 Months, Fair Value		$ 1,982
Available-for-Sale, Less than 12 Months, Unrealized Losses		(17)
Available-for-Sale, 12 Months or More, Fair Value
Available-for-Sale, 12 Months or More, Unrealized Losses
Held-to-Maturity, Less than 12 Months, Fair Value	$ 1,396	11,163
Held-to-Maturity, Less than 12 Months, Unrealized Losses	(2)	(44)
Held-to-Maturity, 12 Months or More, Fair Value		1,560
Held-to-Maturity, 12 Months or More, Unrealized Losses		(27)
Residential Mortgage Backed Securities [Member]
Available-for-Sale, Less than 12 Months, Fair Value	1,646	83,403
Available-for-Sale, Less than 12 Months, Unrealized Losses	(2)	(458)
Available-for-Sale, 12 Months or More, Fair Value	2,099	9,061
Available-for-Sale, 12 Months or More, Unrealized Losses	(441)	(150)
Commercial Mortgage Backed Securities [Member]
Available-for-Sale, Less than 12 Months, Fair Value	13,893	24,337
Available-for-Sale, Less than 12 Months, Unrealized Losses	(15)	(272)
Available-for-Sale, 12 Months or More, Fair Value	13,612	8,918
Available-for-Sale, 12 Months or More, Unrealized Losses	(18)	(344)
Held-to-Maturity, Less than 12 Months, Fair Value		14,143
Held-to-Maturity, Less than 12 Months, Unrealized Losses		(170)
Held-to-Maturity, 12 Months or More, Fair Value
Held-to-Maturity, 12 Months or More, Unrealized Losses
US States and Political Subdivisions Debt Securities [Member]
Available-for-Sale, Less than 12 Months, Fair Value		707
Available-for-Sale, Less than 12 Months, Unrealized Losses		(4)
Available-for-Sale, 12 Months or More, Fair Value
Available-for-Sale, 12 Months or More, Unrealized Losses
Held-to-Maturity, Less than 12 Months, Fair Value	568	572
Held-to-Maturity, Less than 12 Months, Unrealized Losses	(3)	(4)
Held-to-Maturity, 12 Months or More, Fair Value
Held-to-Maturity, 12 Months or More, Unrealized Losses
US Treasury Securities [Member]
Available-for-Sale, Less than 12 Months, Fair Value	80
Available-for-Sale, Less than 12 Months, Unrealized Losses
Available-for-Sale, 12 Months or More, Fair Value
Available-for-Sale, 12 Months or More, Unrealized Losses
Corporate Debt Securities [Member]
Available-for-Sale, Less than 12 Months, Fair Value		779
Available-for-Sale, Less than 12 Months, Unrealized Losses
Available-for-Sale, 12 Months or More, Fair Value
Available-for-Sale, 12 Months or More, Unrealized Losses
Available-for-Sale, Less than 12 Months, Fair Value	15,619	111,208
Available-for-Sale, Less than 12 Months, Unrealized Losses	(17)	(751)
Available-for-Sale, 12 Months or More, Fair Value	15,711	17,979
Available-for-Sale, 12 Months or More, Unrealized Losses	(459)	(494)
Held-to-Maturity, Less than 12 Months, Fair Value	1,964	25,878
Held-to-Maturity, Less than 12 Months, Unrealized Losses	(5)	(218)
Held-to-Maturity, 12 Months or More, Fair Value		1,560
Held-to-Maturity, 12 Months or More, Unrealized Losses		$ (27)

X

- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563

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- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563

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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 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563

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-Topic 320
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563

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Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity that have been in a continuous loss position for twelve months or longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563

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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563

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-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563

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