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Note 10 - Securities Sold Under Agreements to Repurchase - Contractual Maturity of the Agreements (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement | $ 121,400 | $ 102,400
US Government Agencies Debt Securities [Member] |  |
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement | 121,352 | 102,404
Maturity Overnight [Member] | US Government Agencies Debt Securities [Member] |  |
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement | 121,352 | 101,647
Maturity Less than 30 Days [Member] | US Government Agencies Debt Securities [Member] |  |
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement |  |
Maturity 30 to 90 Days [Member] | US Government Agencies Debt Securities [Member] |  |
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement |  |
Maturity Greater than 90 Days [Member] | US Government Agencies Debt Securities [Member] |  |
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement |  | $ 757

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- Definition Amount, before effects of master netting arrangements, of funds outstanding borrowed in the form of a financial asset repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same financial asset at a date certain for a specified price. Includes repurchase-to-maturity transactions and liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 7 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=64858031&loc=SL34722452-111729 + Details
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