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Note 4 - Investment Securities Available-for-sale (Details) - Securities Available-for-sale - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Note 4 - Investment Securities Available-for-sale (Details) - Securities Available-for-sale [Line Items] |  |
Amortized Cost | $ 486,134 | $ 377,933
Gross Unrealized gains | 5,327 | 7,087
Gross unrealized losses | 3,592 | 2,677
Estimated Fair Value | 487,869 | 382,343
US Government Agencies Debt Securities [Member] |  |
Note 4 - Investment Securities Available-for-sale (Details) - Securities Available-for-sale [Line Items] |  |
Amortized Cost | 56,775 | 29,434
Gross Unrealized gains | 477 | 500
Gross unrealized losses | 277 | 40
Estimated Fair Value | 56,975 | 29,894
Residential Mortgage Backed Securities [Member] |  |
Note 4 - Investment Securities Available-for-sale (Details) - Securities Available-for-sale [Line Items] |  |
Amortized Cost | 299,709 | 241,120
Gross Unrealized gains | 692 | 1,716
Gross unrealized losses | 3,160 | 2,516
Estimated Fair Value | 297,241 | 240,320
US States and Political Subdivisions Debt Securities [Member] |  |
Note 4 - Investment Securities Available-for-sale (Details) - Securities Available-for-sale [Line Items] |  |
Amortized Cost | 114,253 | 106,983
Gross Unrealized gains | 4,131 | 4,850
Gross unrealized losses | 3 | 121
Estimated Fair Value | 118,381 | 111,712
Corporate Debt Securities [Member] |  |
Note 4 - Investment Securities Available-for-sale (Details) - Securities Available-for-sale [Line Items] |  |
Amortized Cost | 15,090 |
Gross Unrealized gains | 0 |
Gross unrealized losses | 152 |
Estimated Fair Value | 14,938 |
Equity Investment Other [Member] |  |
Note 4 - Investment Securities Available-for-sale (Details) - Securities Available-for-sale [Line Items] |  |
Amortized Cost | 307 | 396
Gross Unrealized gains | 27 | 21
Gross unrealized losses | 0 | 0
Estimated Fair Value | $ 334 | $ 417

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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=51813488&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=49167202&loc=d3e26610-111562 + Details
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