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Note 8 - Loans (Details) - Non-accrual Troubled Debt Restructurings - Non Accruing Troubled Debt Restructuring [Member] - USD ($) $ in Thousands | Sep. 30, 2015 | Jun. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Dec. 31, 2013
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Note 8 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items] |  |  |  |  |  |
Non-accrual TDRs | $ 41,806 | $ 42,595 | $ 41,618 | $ 34,162 | $ 43,605 | $ 38,769
Payment Deferral [Member] |  |  |  |  |  |
Note 8 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items] |  |  |  |  |  |
Non-accrual TDRs | 14,372 |  | 18,366 |  |  |
Rate Reduction and Payment Deferral [Member] |  |  |  |  |  |
Note 8 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items] |  |  |  |  |  |
Non-accrual TDRs | 27,434 |  | 22,392 |  |  |
Rate Reduction [Member] |  |  |  |  |  |
Note 8 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items] |  |  |  |  |  |
Non-accrual TDRs |  |  | 860 |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |
Note 8 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items] |  |  |  |  |  |
Non-accrual TDRs | 2,338 |  | 3,552 |  |  |
Commercial Portfolio Segment [Member] | Payment Deferral [Member] |  |  |  |  |  |
Note 8 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items] |  |  |  |  |  |
Non-accrual TDRs | 2,248 |  | 1,423 |  |  |
Commercial Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member] |  |  |  |  |  |
Note 8 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items] |  |  |  |  |  |
Non-accrual TDRs | 90 |  | 1,269 |  |  |
Commercial Portfolio Segment [Member] | Rate Reduction [Member] |  |  |  |  |  |
Note 8 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items] |  |  |  |  |  |
Non-accrual TDRs |  |  | 860 |  |  |
Real Estate Construction Portfolio Segment [Member] |  |  |  |  |  |
Note 8 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items] |  |  |  |  |  |
Non-accrual TDRs | 16,079 |  | 19,462 |  |  |
Real Estate Construction Portfolio Segment [Member] | Payment Deferral [Member] |  |  |  |  |  |
Note 8 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items] |  |  |  |  |  |
Non-accrual TDRs | 10,172 |  |  |  |  |
Real Estate Construction Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member] |  |  |  |  |  |
Note 8 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items] |  |  |  |  |  |
Non-accrual TDRs | 5,907 |  | 19,462 |  |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Note 8 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items] |  |  |  |  |  |
Non-accrual TDRs | 22,280 |  | 16,890 |  |  |
Commercial Real Estate Portfolio Segment [Member] | Payment Deferral [Member] |  |  |  |  |  |
Note 8 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items] |  |  |  |  |  |
Non-accrual TDRs | 1,555 |  | 15,917 |  |  |
Commercial Real Estate Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member] |  |  |  |  |  |
Note 8 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items] |  |  |  |  |  |
Non-accrual TDRs | 20,725 |  | 973 |  |  |
Residential Portfolio Segment [Member] |  |  |  |  |  |
Note 8 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items] |  |  |  |  |  |
Non-accrual TDRs | 1,109 |  | 1,714 |  |  |
Residential Portfolio Segment [Member] | Payment Deferral [Member] |  |  |  |  |  |
Note 8 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items] |  |  |  |  |  |
Non-accrual TDRs | 397 |  | 1,026 |  |  |
Residential Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member] |  |  |  |  |  |
Note 8 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items] |  |  |  |  |  |
Non-accrual TDRs | $ 712 |  | $ 688 |  |  |

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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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