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Note 3 - Investment Securities - Investments' Gross Unrealized Losses and Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Held-to-Maturity, 12 Months or More, Fair Value	$ 547
Held-to-Maturity, 12 Months or More, Unrealized Losses	(4)
Available-for-Sale, Less than 12 Months, Fair Value	79,751	142,723
Available-for-Sale, Less than 12 Months, Unrealized Losses	(675)	(2,936)
Available-for-Sale, 12 Months or More, Fair Value	29,232	12,625
Available-for-Sale, 12 Months or More, Unrealized Losses	(431)	(368)
Held-to-Maturity, 12 Months or More, Unrealized Losses	(547)
Held-to-Maturity, Less than 12 Months, Fair Value	15,084	22,361
Held-to-Maturity, Less than 12 Months, Unrealized Losses	(126)	(416)
Residential Mortgage Backed Securities [Member]
Available-for-Sale, Less than 12 Months, Fair Value	47,011	85,741
Available-for-Sale, Less than 12 Months, Unrealized Losses	(273)	(1,976)
Available-for-Sale, 12 Months or More, Fair Value	2,086	1,904
Available-for-Sale, 12 Months or More, Unrealized Losses	(31)	(27)
Commercial Mortgage Backed Securities [Member]
Held-to-Maturity, 12 Months or More, Fair Value
Held-to-Maturity, 12 Months or More, Unrealized Losses
Available-for-Sale, Less than 12 Months, Fair Value	32,660	54,475
Available-for-Sale, Less than 12 Months, Unrealized Losses	(402)	(946)
Available-for-Sale, 12 Months or More, Fair Value	27,146	10,721
Available-for-Sale, 12 Months or More, Unrealized Losses	(400)	(341)
Held-to-Maturity, 12 Months or More, Unrealized Losses
Held-to-Maturity, Less than 12 Months, Fair Value	7,514	12,776
Held-to-Maturity, Less than 12 Months, Unrealized Losses	(55)	(148)
US Government Agencies Debt Securities [Member]
Held-to-Maturity, 12 Months or More, Fair Value
Held-to-Maturity, 12 Months or More, Unrealized Losses
Available-for-Sale, Less than 12 Months, Fair Value		1,993
Available-for-Sale, Less than 12 Months, Unrealized Losses		(7)
Available-for-Sale, 12 Months or More, Fair Value
Available-for-Sale, 12 Months or More, Unrealized Losses
Held-to-Maturity, 12 Months or More, Unrealized Losses
Held-to-Maturity, Less than 12 Months, Fair Value	7,570	7,957
Held-to-Maturity, Less than 12 Months, Unrealized Losses	(71)	(222)
US Treasury Securities [Member]
Available-for-Sale, Less than 12 Months, Fair Value	80	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
US States and Political Subdivisions Debt Securities [Member]
Held-to-Maturity, 12 Months or More, Fair Value	547
Held-to-Maturity, 12 Months or More, Unrealized Losses	(4)
Available-for-Sale, Less than 12 Months, Fair Value		434
Available-for-Sale, Less than 12 Months, Unrealized Losses		(7)
Available-for-Sale, 12 Months or More, Fair Value
Available-for-Sale, 12 Months or More, Unrealized Losses
Held-to-Maturity, 12 Months or More, Unrealized Losses	(547)
Held-to-Maturity, Less than 12 Months, Fair Value		1,628
Held-to-Maturity, Less than 12 Months, Unrealized Losses		$ (46)

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=82897076&loc=d3e27290-111563

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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)
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+ References

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-Publisher FASB
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-Topic 320
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-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Paragraph 6
-Subparagraph (a)(1)
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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