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Note 4 - Investment Securities Available-for-Sale (Details) - Securities Available-for-sale (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2013
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Note 4 - Investment Securities Available-for-Sale (Details) - Securities Available-for-sale [Line Items] |  |  |
Amortized Cost | $ 379,947 | $ 383,665 |
Gross Unrealized Gains | 6,592 | 4,003 |
Gross Unrealized Losses | 4,071 | 9,535 |
Estimated Fair Value | 382,468 | 378,133 | 355,830
US Government Agencies Debt Securities [Member] |  |  |
Note 4 - Investment Securities Available-for-Sale (Details) - Securities Available-for-sale [Line Items] |  |  |
Amortized Cost | 38,636 | 46,640 |
Gross Unrealized Gains | 545 | 843 |
Gross Unrealized Losses | 97 | 148 |
Estimated Fair Value | 39,084 | 47,335 |
Residential Mortgage Backed Securities [Member] |  |  |
Note 4 - Investment Securities Available-for-Sale (Details) - Securities Available-for-sale [Line Items] |  |  |
Amortized Cost | 227,525 | 234,206 |
Gross Unrealized Gains | 1,328 | 1,143 |
Gross Unrealized Losses | 3,724 | 6,675 |
Estimated Fair Value | 225,129 | 228,674 |
Municipal Bond [Member] |  |  |
Note 4 - Investment Securities Available-for-Sale (Details) - Securities Available-for-sale [Line Items] |  |  |
Amortized Cost | 113,390 | 102,423 |
Gross Unrealized Gains | 4,716 | 2,017 |
Gross Unrealized Losses | 250 | 2,700 |
Estimated Fair Value | 117,856 | 101,740 |
Equity Investment Other [Member] |  |  |
Note 4 - Investment Securities Available-for-Sale (Details) - Securities Available-for-sale [Line Items] |  |  |
Amortized Cost | 396 | 396 |
Gross Unrealized Gains | 3 |  |
Gross Unrealized Losses |  | 12 |
Estimated Fair Value | $ 399 | $ 384 |

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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=28360136&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=27724398&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=6871852&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=27724398&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=27724398&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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