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Note 5 - Loans - Non-accrual Troubled Debt Restructurings (Details) - Non-accruing Troubled Debt Restructuring [Member] - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Accruing TDRs | $ 33,416 | $ 29,722 | $ 39,923 | $ 41,618
Payment Deferral [Member] |  |  |  |
Accruing TDRs | 20,472 | 17,431 |  |
Contractual Interest Rate Reduction [Member] |  |  |  |
Accruing TDRs | 1,677 | 1,795 |  |
Rate Reduction and Payment Deferral [Member] |  |  |  |
Accruing TDRs | 11,267 | 10,496 |  |
Commercial Portfolio Segment [Member] |  |  |  |
Accruing TDRs | 12,944 | 14,565 |  |
Commercial Portfolio Segment [Member] | Payment Deferral [Member] |  |  |  |
Accruing TDRs | 12,944 | 14,565 |  |
Commercial Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member] |  |  |  |
Accruing TDRs |  |  |  |
Commercial Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member] |  |  |  |
Accruing TDRs |  |  |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Accruing TDRs | 19,021 | 14,633 |  |
Commercial Real Estate Portfolio Segment [Member] | Payment Deferral [Member] |  |  |  |
Accruing TDRs | 6,231 | 2,510 |  |
Commercial Real Estate Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member] |  |  |  |
Accruing TDRs | 1,677 | 1,795 |  |
Commercial Real Estate Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member] |  |  |  |
Accruing TDRs | 11,113 | 10,328 |  |
Residential Portfolio Segment [Member] |  |  |  |
Accruing TDRs | 1,451 | 524 |  |
Residential Portfolio Segment [Member] | Payment Deferral [Member] |  |  |  |
Accruing TDRs | 1,297 | 356 |  |
Residential Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member] |  |  |  |
Accruing TDRs |  |  |  |
Residential Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member] |  |  |  |
Accruing TDRs | $ 154 | $ 168 |  |

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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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