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Note 5 - Loans - Accruing Troubled Debt Restructurings (Details) - Accruing Troubled Debt Restructuring [Member] - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Accruing TDRs | $ 68,565 | $ 65,393 | $ 81,680 | $ 104,356
Payment Deferral [Member] |  |  |  |
Accruing TDRs | 44,119 | 39,054 |  |
Contractual Interest Rate Reduction [Member] |  |  |  |
Accruing TDRs | 6,206 | 6,750 |  |
Rate Reduction and Payment Deferral [Member] |  |  |  |
Accruing TDRs | 18,240 | 19,589 |  |
Commercial Portfolio Segment [Member] |  |  |  |
Accruing TDRs | 29,199 | 12,052 |  |
Commercial Portfolio Segment [Member] | Payment Deferral [Member] |  |  |  |
Accruing TDRs | 29,199 | 7,971 |  |
Commercial Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member] |  |  |  |
Accruing TDRs |  |  |  |
Commercial Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member] |  |  |  |
Accruing TDRs |  | 4,081 |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Accruing TDRs | 32,843 | 44,392 |  |
Commercial Real Estate Portfolio Segment [Member] | Payment Deferral [Member] |  |  |  |
Accruing TDRs | 11,504 | 25,979 |  |
Commercial Real Estate Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member] |  |  |  |
Accruing TDRs | 5,871 | 5,961 |  |
Commercial Real Estate Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member] |  |  |  |
Accruing TDRs | 15,468 | 12,452 |  |
Residential Portfolio Segment [Member] |  |  |  |
Accruing TDRs | 6,523 | 8,949 |  |
Residential Portfolio Segment [Member] | Payment Deferral [Member] |  |  |  |
Accruing TDRs | 3,416 | 5,104 |  |
Residential Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member] |  |  |  |
Accruing TDRs | 335 | 789 |  |
Residential Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member] |  |  |  |
Accruing TDRs | $ 2,772 | $ 3,056 |  |

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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=82895541&loc=d3e18845-111554 + Details
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