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Note 5 - Loans (Details) - Troubled Debt Restructuring Activity - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Accruing Troubled Debt Restructuring [Member] |  |  |
Note 5 - Loans (Details) - Troubled Debt Restructuring Activity [Line Items] |  |  |
Beginning balance | $ 104,356 | $ 117,597 | $ 144,695
New restructurings | 17,752 | 23,740 | 21,382
Restructured loans restored to accrual status | 723 | 962 | 6,851
Charge-offs | (104) |  | (78)
Payments | (30,858) | (13,256) | (52,362)
Restructured loans placed on nonaccrual | (10,189) | (24,687) | (2,891)
Ending balance | 81,680 | 104,356 | 117,597
Non Accruing Troubled Debt Restructuring [Member] |  |  |
Note 5 - Loans (Details) - Troubled Debt Restructuring Activity [Line Items] |  |  |
Beginning balance | 41,618 | 38,769 | 47,731
New restructurings | 2,006 | 1,331 | 6,226
Restructured loans restored to accrual status | (723) | (962) | (6,851)
Charge-offs | (3,246) | (8,937) | (2,124)
Payments | (9,921) | (11,710) | (4,295)
Foreclosures |  | (1,560) | (4,809)
Restructured loans placed on nonaccrual | 10,189 | 24,687 | 2,891
Ending balance | $ 39,923 | $ 41,618 | $ 38,769

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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 + Details
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- Definition Reflects the amount of the write-down related to a troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 + Details
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