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Note 3 - Investment Securities Available-for-sale - Securities Available-for-sale (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015
--- | --- | --- | ---
US Government Agencies Debt Securities [Member] |  |  |
Amortized cost | $ 55,862 | $ 56,775 |
Gross unrealized gains | 638 | 477 |
Gross unrealized losses | 136 | 277 |
Estimated fair value | 56,364 | 56,975 |
Residential Mortgage Backed Securities [Member] |  |  |
Amortized cost | 264,101 | 299,709 |
Gross unrealized gains | 2,284 | 692 |
Gross unrealized losses | 350 | 3,160 |
Estimated fair value | 266,035 | 297,241 |
US States and Political Subdivisions Debt Securities [Member] |  |  |
Amortized cost | 94,923 | 114,253 |
Gross unrealized gains | 4,954 | 4,131 |
Gross unrealized losses |  | 3 |
Estimated fair value | 99,877 | 118,381 |
Corporate Debt Securities [Member] |  |  |
Amortized cost | 8,009 | 15,090 |
Gross unrealized gains | 68 |  |
Gross unrealized losses | 23 | 152 |
Estimated fair value | 8,054 | 14,938 |
Equity Investment Other [Member] |  |  |
Amortized cost | 310 | 307 |
Gross unrealized gains | 28 | 27 |
Gross unrealized losses |  |  |
Estimated fair value | 338 | 334 |
Amortized cost | 423,205 | 486,134 |
Gross unrealized gains | 7,972 | 5,327 |
Gross unrealized losses | 509 | 3,592 |
Estimated fair value | $ 430,668 | $ 487,869 | $ 524,326

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity 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 and equity 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 and equity 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 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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