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Note 7 - Loans - Accruing Troubled Debt Restructurings (Details) - Accruing Troubled Debt Restructuring [Member] - USD ($) $ in Thousands | Sep. 30, 2016 | Jun. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | --- | --- | --- | --- | ---
Commercial Portfolio Segment [Member] | Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs | $ 22,019 |  | $ 8,298 |  |  |
Commercial Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member] |  |  |  |  |  |
Accruing TDRs |  |  |  |  |  |
Commercial Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs | 1,360 |  | 1,726 |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |
Accruing TDRs | 23,379 |  | 10,024 |  |  |
Commercial Real Estate Portfolio Segment [Member] | Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs | 26,835 |  | 16,701 |  |  |
Commercial Real Estate Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member] |  |  |  |  |  |
Accruing TDRs | 5,986 |  | 6,045 |  |  |
Commercial Real Estate Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs | 20,690 |  | 33,800 |  |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Accruing TDRs | 53,511 |  | 56,546 |  |  |
Real Estate Construction Portfolio Segment [Member] | Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs |  |  |  |  |  |
Real Estate Construction Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member] |  |  |  |  |  |
Accruing TDRs |  |  |  |  |  |
Real Estate Construction Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs |  |  | 5,696 |  |  |
Real Estate Construction Portfolio Segment [Member] |  |  |  |  |  |
Accruing TDRs |  |  | 5,696 |  |  |
Residential Portfolio Segment [Member] | Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs | 5,048 |  | 5,201 |  |  |
Residential Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member] |  |  |  |  |  |
Accruing TDRs | 989 |  | 999 |  |  |
Residential Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs | 3,628 |  | 3,214 |  |  |
Residential Portfolio Segment [Member] |  |  |  |  |  |
Accruing TDRs | 9,665 |  | 9,414 |  |  |
Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs | 53,902 |  | 30,200 |  |  |
Contractual Interest Rate Reduction [Member] |  |  |  |  |  |
Accruing TDRs | 6,975 |  | 7,044 |  |  |
Rate Reduction and Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs | 25,678 |  | 44,436 |  |  |
Accruing TDRs | $ 86,555 | $ 74,708 | $ 81,680 | $ 89,881 | $ 100,011 | $ 104,355

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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Recorded Investment -URI http://asc.fasb.org/extlink&oid=65880944 + Details
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