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Note 3 - Investment Securities Available-for-Sale (Details) - Securities Available-for-sale - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
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Note 3 - Investment Securities Available-for-Sale (Details) - Securities Available-for-sale [Line Items] |  |
Amortized Cost | $ 518,807 | $ 377,933
Gross Unrealized gains | 6,912 | 7,087
Gross unrealized losses | 524,326 | 382,343
US Government Agencies Debt Securities [Member] |  |
Note 3 - Investment Securities Available-for-Sale (Details) - Securities Available-for-sale [Line Items] |  |
Amortized Cost | 68,289 | 29,434
Gross Unrealized gains | 879 | 500
Gross unrealized losses | 69,078 | 29,894
Residential Mortgage Backed Securities [Member] |  |
Note 3 - Investment Securities Available-for-Sale (Details) - Securities Available-for-sale [Line Items] |  |
Amortized Cost | 320,978 | 241,120
Gross Unrealized gains | 2,172 | 1,716
Gross unrealized losses | 322,020 | 240,320
US States and Political Subdivisions Debt Securities [Member] |  |
Note 3 - Investment Securities Available-for-Sale (Details) - Securities Available-for-sale [Line Items] |  |
Amortized Cost | 114,137 | 106,983
Gross Unrealized gains | 3,824 | 4,850
Gross unrealized losses | 117,866 | 111,712
Corporate Debt Securities [Member] |  |
Note 3 - Investment Securities Available-for-Sale (Details) - Securities Available-for-sale [Line Items] |  |
Amortized Cost | 15,096 |
Gross unrealized losses | 15,018 |
Equity Investment Other [Member] |  |
Note 3 - Investment Securities Available-for-Sale (Details) - Securities Available-for-sale [Line Items] |  |
Amortized Cost | 307 | 396
Gross Unrealized gains | 37 | 21
Gross unrealized losses | $ 344 | $ 417

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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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