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Note 3 - Investment Securities Available-for-sale - Securities Available-for-sale (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016
--- | --- | --- | ---
Amortized cost | $ 502,403 | $ 541,364 | $ 480,534
Gross unrealized gains | 2,296 | 2,648 | 7,934
Gross unrealized losses | 4,892 | 5,904 | 859
Estimated fair value | 499,807 | 538,108 | 487,609
US Government Agencies Debt Securities [Member] |  |  |
Amortized cost | 149,160 | 107,425 | 54,948
Gross unrealized gains | 315 | 519 | 774
Gross unrealized losses | 1,567 | 1,802 | 100
Estimated fair value | 147,908 | 106,142 | 55,622
Residential Mortgage Backed Securities [Member] |  |  |
Amortized cost | 299,757 | 329,606 | 305,351
Gross unrealized gains | 478 | 324 | 2,073
Gross unrealized losses | 3,310 | 3,691 | 612
Estimated fair value | 296,925 | 326,239 | 306,812
US States and Political Subdivisions Debt Securities [Member] |  |  |
Amortized cost | 43,255 | 94,607 | 104,840
Gross unrealized gains | 1,369 | 1,723 | 5,069
Gross unrealized losses | 15 | 400 |
Estimated fair value | 44,609 | 95,930 | 109,909
Corporate Debt Securities [Member] |  |  |
Amortized cost | 10,013 | 9,508 | 15,085
Gross unrealized gains | 134 | 82 |
Gross unrealized losses |  | 11 | 147
Estimated fair value | 10,147 | 9,579 | 14,938
Equity Investment Other [Member] |  |  |
Amortized cost | 218 | 218 | 310
Gross unrealized gains |  |  | 18
Gross unrealized losses |  |  |
Estimated fair value | $ 218 | $ 218 | $ 328

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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=75030427&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=82897076&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=82896770&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=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 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=82897076&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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