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Note 3 - Securities - Securities Held-to-maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Securities held-to-maturity, Amortized Costs | $ 134,957 | $ 152,028
Securities held-to-maturity, Gross Unrealized Gains | 3,817 | 6,513
Securities held-to-maturity, Gross Unrealized Losses | 1,082 | 509
Securities held-to-maturity, Fair Values | 137,692 | 158,032
US Government Agencies Debt Securities [Member] |  |
Securities held-to-maturity, Amortized Costs | 3,934 | 13,909
Securities held-to-maturity, Gross Unrealized Gains | 201 | 288
Securities held-to-maturity, Gross Unrealized Losses | 0 | 177
Securities held-to-maturity, Fair Values | 4,135 | 14,020
US States and Political Subdivisions Debt Securities [Member] |  |
Securities held-to-maturity, Amortized Costs | 129,783 | 136,373
Securities held-to-maturity, Gross Unrealized Gains | 3,579 | 6,179
Securities held-to-maturity, Gross Unrealized Losses | 1,082 | 330
Securities held-to-maturity, Fair Values | 132,280 | 142,222
Collateralized Mortgage Backed Securities [Member] |  |
Securities held-to-maturity, Amortized Costs | 265 | 327
Securities held-to-maturity, Gross Unrealized Gains | 30 | 36
Securities held-to-maturity, Gross Unrealized Losses | 0 | 0
Securities held-to-maturity, Fair Values | 295 | 363
Corporate Debt Securities [Member] |  |
Securities held-to-maturity, Amortized Costs | 975 | 1,419
Securities held-to-maturity, Gross Unrealized Gains | 7 | 10
Securities held-to-maturity, Gross Unrealized Losses | 0 | 2
Securities held-to-maturity, Fair Values | $ 982 | $ 1,427

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- Definition Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 + Details
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- Definition Fair value of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 + Details
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