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Note 3 - Investment Securities - Available-for-sale and Held-to-maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Available-for-Sale, Amortized Cost | $ 185,076 | $ 184,278
Available-for-Sale, Gross Unrealized Gains | 884 | 936
Available-for-Sale, Gross Unrealized Losses | (2,102) | (3,304)
Available-for-Sale, Estimated Fair Value | 183,858 | 181,910
Held-to-Maturity, Amortized Cost | 29,639 | 25,904
Held-to-Maturity, Gross Unrealized Gains | 25 | 20
Held-to-Maturity, Gross Unrealized Losses | (306) | (416)
Held-to-Maturity, Estimated Fair Value | 29,358 | 25,508
Residential Mortgage Backed Securities [Member] |  |
Available-for-Sale, Amortized Cost | 97,003 | 99,922
Available-for-Sale, Gross Unrealized Gains | 434 | 490
Available-for-Sale, Gross Unrealized Losses | (938) | (2,003)
Available-for-Sale, Estimated Fair Value | 96,499 | 98,409
Commercial Mortgage Backed Securities [Member] |  |
Available-for-Sale, Amortized Cost | 77,606 | 71,761
Available-for-Sale, Gross Unrealized Gains | 51 | 56
Available-for-Sale, Gross Unrealized Losses | (1,156) | (1,287)
Available-for-Sale, Estimated Fair Value | 76,501 | 70,530
Held-to-Maturity, Amortized Cost | 17,880 | 14,684
Held-to-Maturity, Gross Unrealized Gains | 7 | 5
Held-to-Maturity, Gross Unrealized Losses | (132) | (148)
Held-to-Maturity, Estimated Fair Value | 17,755 | 14,541
US Government Agencies Debt Securities [Member] |  |
Available-for-Sale, Amortized Cost | 2,000 | 2,000
Available-for-Sale, Gross Unrealized Gains | 4 |
Available-for-Sale, Gross Unrealized Losses |  | (7)
Available-for-Sale, Estimated Fair Value | 2,004 | 1,993
Held-to-Maturity, Amortized Cost | 9,715 | 9,129
Held-to-Maturity, Gross Unrealized Gains | 12 | 13
Held-to-Maturity, Gross Unrealized Losses | (152) | (222)
Held-to-Maturity, Estimated Fair Value | 9,575 | 8,920
US States and Political Subdivisions Debt Securities [Member] |  |
Available-for-Sale, Amortized Cost | 7,637 | 9,759
Available-for-Sale, Gross Unrealized Gains | 395 | 390
Available-for-Sale, Gross Unrealized Losses | (8) | (7)
Available-for-Sale, Estimated Fair Value | 8,024 | 10,142
Held-to-Maturity, Amortized Cost | 2,044 | 2,091
Held-to-Maturity, Gross Unrealized Gains | 6 | 2
Held-to-Maturity, Gross Unrealized Losses | (22) | (46)
Held-to-Maturity, Estimated Fair Value | 2,028 | 2,047
Corporate Debt Securities [Member] |  |
Available-for-Sale, Amortized Cost | 750 | 756
Available-for-Sale, Gross Unrealized Gains |  |
Available-for-Sale, Gross Unrealized Losses |  |
Available-for-Sale, Estimated Fair Value | 750 | 756
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=82897076&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=82897076&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=82897076&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=82897076&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=75030427&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=82897076&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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