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Note 3 - Investment Securities - Investments' Gross Unrealized Losses and Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Available-for-Sale, Less than 12 Months, Fair Value	$ 124,317	$ 142,723
Available-for-Sale, Less than 12 Months, Unrealized Losses	(1,732)	(2,936)
Available-for-Sale, 12 Months or More, Fair Value	19,795	12,625
Available-for-Sale, 12 Months or More, Unrealized Losses	(370)	(368)
Held-to-Maturity, Less than 12 Months, Fair Value	22,704	22,361
Held-to-Maturity, Less than 12 Months, Unrealized Losses	(299)	(416)
Held-to-Maturity, 12 Months or More, Unrealized Losses	(549)
Held-to-Maturity, 12 Months or More, Fair Value	549
Held-to-Maturity, 12 Months or More, Unrealized Losses	(7)
Residential Mortgage Backed Securities [Member]
Available-for-Sale, Less than 12 Months, Fair Value	75,284	85,741
Available-for-Sale, Less than 12 Months, Unrealized Losses	(917)	(1,976)
Available-for-Sale, 12 Months or More, Fair Value	1,729	1,904
Available-for-Sale, 12 Months or More, Unrealized Losses	(21)	(27)
Commercial Mortgage Backed Securities [Member]
Available-for-Sale, Less than 12 Months, Fair Value	48,106	54,475
Available-for-Sale, Less than 12 Months, Unrealized Losses	(807)	(946)
Available-for-Sale, 12 Months or More, Fair Value	18,066	10,721
Available-for-Sale, 12 Months or More, Unrealized Losses	(349)	(341)
Held-to-Maturity, Less than 12 Months, Fair Value	13,030	12,776
Held-to-Maturity, Less than 12 Months, Unrealized Losses	(132)	(148)
Held-to-Maturity, 12 Months or More, Unrealized Losses
Held-to-Maturity, 12 Months or More, Fair Value
Held-to-Maturity, 12 Months or More, Unrealized Losses
US Government Agencies Debt Securities [Member]
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, Less than 12 Months, Fair Value	8,618	7,957
Held-to-Maturity, Less than 12 Months, Unrealized Losses	(152)	(222)
Held-to-Maturity, 12 Months or More, Unrealized Losses
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	847	434
Available-for-Sale, Less than 12 Months, Unrealized Losses	(8)	(7)
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	1,056	1,628
Held-to-Maturity, Less than 12 Months, Unrealized Losses	(15)	(46)
Held-to-Maturity, 12 Months or More, Unrealized Losses	(549)
Held-to-Maturity, 12 Months or More, Fair Value	549
Held-to-Maturity, 12 Months or More, Unrealized Losses	(7)
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

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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-SubTopic 10
-Section 50
-Paragraph 7
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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
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-Section 50
-Paragraph 6
-Subparagraph (a)(2)
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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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-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
-SubTopic 10
-Section 50
-Paragraph 7
-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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-Topic 320
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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-Topic 320
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-Publisher FASB
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