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Note 3 - Investment Securities - Available-for-sale and Held-to-maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Available-for-Sale, Amortized Cost | $ 184,278 | $ 197,995
Available-for-Sale, Gross Unrealized Gains | 936 | 2,093
Available-for-Sale, Gross Unrealized Losses | (3,304) | (1,245)
Available-for-Sale, Estimated Fair Value | 181,910 | 198,843
Held-to-Maturity, Amortized Cost | 25,904 | 32,359
Held-to-Maturity, Gross Unrealized Gains | 20 | 70
Held-to-Maturity, Gross Unrealized Losses | (416) | (245)
Held-to-Maturity, Estimated Fair Value | 25,508 | 32,184
Residential Mortgage Backed Securities [Member] |  |
Available-for-Sale, Amortized Cost | 99,922 | 135,104
Available-for-Sale, Gross Unrealized Gains | 490 | 998
Available-for-Sale, Gross Unrealized Losses | (2,003) | (608)
Available-for-Sale, Estimated Fair Value | 98,409 | 135,494
Commercial Mortgage Backed Securities [Member] |  |
Available-for-Sale, Amortized Cost | 71,761 | 45,961
Available-for-Sale, Gross Unrealized Gains | 56 | 164
Available-for-Sale, Gross Unrealized Losses | (1,287) | (616)
Available-for-Sale, Estimated Fair Value | 70,530 | 45,509
Held-to-Maturity, Amortized Cost | 14,684 | 16,321
Held-to-Maturity, Gross Unrealized Gains | 5 | 33
Held-to-Maturity, Gross Unrealized Losses | (148) | (170)
Held-to-Maturity, Estimated Fair Value | 14,541 | 16,184
US Government Agencies Debt Securities [Member] |  |
Available-for-Sale, Amortized Cost | 2,000 | 1,999
Available-for-Sale, Gross Unrealized Gains |  |
Available-for-Sale, Gross Unrealized Losses | (7) | (17)
Available-for-Sale, Estimated Fair Value | 1,993 | 1,982
Held-to-Maturity, Amortized Cost | 9,129 | 13,766
Held-to-Maturity, Gross Unrealized Gains | 13 | 19
Held-to-Maturity, Gross Unrealized Losses | (222) | (71)
Held-to-Maturity, Estimated Fair Value | 8,920 | 13,714
US States and Political Subdivisions Debt Securities [Member] |  |
Available-for-Sale, Amortized Cost | 9,759 | 14,071
Available-for-Sale, Gross Unrealized Gains | 390 | 931
Available-for-Sale, Gross Unrealized Losses | (7) | (4)
Available-for-Sale, Estimated Fair Value | 10,142 | 14,998
Held-to-Maturity, Amortized Cost | 2,091 | 2,272
Held-to-Maturity, Gross Unrealized Gains | 2 | 18
Held-to-Maturity, Gross Unrealized Losses | (46) | (4)
Held-to-Maturity, Estimated Fair Value | 2,047 | 2,286
Corporate Debt Securities [Member] |  |
Available-for-Sale, Amortized Cost | 756 | 780
Available-for-Sale, Gross Unrealized Gains |  |
Available-for-Sale, Gross Unrealized Losses |  |
Available-for-Sale, Estimated Fair Value | 756 | 780
US Treasury Securities [Member] |  |
Available-for-Sale, Amortized Cost | 80 | 80
Available-for-Sale, Gross Unrealized Gains |  |
Available-for-Sale, Gross Unrealized Losses |  |
Available-for-Sale, Estimated Fair Value | $ 80 | $ 80

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount after other than temporary impairment (OTTI) accretion, 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 (a) -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 25 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.6) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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