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Note 8 - Borrowings - Contractual Maturities of Repurchase Agreements (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	[1]
Repurchase agreements	$ 83,783	$ 98,005
Maturity Overnight and Continuous [Member]
Repurchase agreements	58,706
Maturity Less than 30 Days [Member]
Repurchase agreements
Maturity 30 to 90 Days [Member]
Repurchase agreements
Maturity Greater than 90 Days [Member]
Repurchase agreements	25,077
US Government Agencies Debt Securities [Member]
Repurchase agreements	14,240
US Government Agencies Debt Securities [Member] | Maturity Overnight and Continuous [Member]
Repurchase agreements	5,240
US Government Agencies Debt Securities [Member] | Maturity Less than 30 Days [Member]
Repurchase agreements
US Government Agencies Debt Securities [Member] | Maturity 30 to 90 Days [Member]
Repurchase agreements
US Government Agencies Debt Securities [Member] | Maturity Greater than 90 Days [Member]
Repurchase agreements	9,000
US Treasury Securities [Member]
Repurchase agreements	16,274
US Treasury Securities [Member] | Maturity Overnight and Continuous [Member]
Repurchase agreements	12,874
US Treasury Securities [Member] | Maturity Less than 30 Days [Member]
Repurchase agreements
US Treasury Securities [Member] | Maturity 30 to 90 Days [Member]
Repurchase agreements
US Treasury Securities [Member] | Maturity Greater than 90 Days [Member]
Repurchase agreements	3,400
US States and Political Subdivisions Debt Securities [Member]
Repurchase agreements	37,953
US States and Political Subdivisions Debt Securities [Member] | Maturity Overnight and Continuous [Member]
Repurchase agreements	37,953
US States and Political Subdivisions Debt Securities [Member] | Maturity Less than 30 Days [Member]
Repurchase agreements
US States and Political Subdivisions Debt Securities [Member] | Maturity 30 to 90 Days [Member]
Repurchase agreements
US States and Political Subdivisions Debt Securities [Member] | Maturity Greater than 90 Days [Member]
Repurchase agreements
Mortgage-backed Agency Securities [Member]
Repurchase agreements	15,316
Mortgage-backed Agency Securities [Member] | Maturity Overnight and Continuous [Member]
Repurchase agreements	2,639
Mortgage-backed Agency Securities [Member] | Maturity Less than 30 Days [Member]
Repurchase agreements
Mortgage-backed Agency Securities [Member] | Maturity 30 to 90 Days [Member]
Repurchase agreements
Mortgage-backed Agency Securities [Member] | Maturity Greater than 90 Days [Member]
Repurchase agreements	$ 12,677
[1] Derived from audited financial statements

X

- Definition

Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(m)(1)(a)(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13(1))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=49176635&loc=d3e9760-107771

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