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Note 3 - Investment Securities Available-for-sale - Securities Available-for-sale (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2015
--- | --- | --- | ---
US Government Agencies Debt Securities [Member] |  |  |
Amortized cost | $ 54,948 | $ 56,775 |
Gross unrealized gains | 774 | 477 |
Gross unrealized losses | 100 | 277 |
Estimated fair value | 55,622 | 56,975 |
Residential Mortgage Backed Securities [Member] |  |  |
Amortized cost | 305,351 | 299,709 |
Gross unrealized gains | 2,073 | 692 |
Gross unrealized losses | 612 | 3,160 |
Estimated fair value | 306,812 | 297,241 |
US States and Political Subdivisions Debt Securities [Member] |  |  |
Amortized cost | 104,840 | 114,253 |
Gross unrealized gains | $ 5,069 | 4,131 |
Gross unrealized losses |  | 3 |
Estimated fair value | $ 109,909 | 118,381 |
Corporate Debt Securities [Member] |  |  |
Amortized cost | $ 15,085 | $ 15,090 |
Gross unrealized gains |  |  |
Gross unrealized losses | $ 147 | $ 152 |
Estimated fair value | 14,938 | 14,938 |
Equity Investment Other [Member] |  |  |
Amortized cost | 310 | 307 |
Gross unrealized gains | $ 18 | $ 27 |
Gross unrealized losses |  |  |
Estimated fair value | $ 328 | $ 334 |
Amortized cost | 480,534 | 486,134 |
Gross unrealized gains | 7,934 | 5,327 |
Gross unrealized losses | 859 | 3,592 |
Estimated fair value | $ 487,609 | $ 487,869 | $ 333,531

X
- 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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