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Note 8 - Loans - Non-accrual Troubled Debt Restructurings (Details) - Non-accruing Troubled Debt Restructuring [Member] - USD ($) $ in Thousands | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | --- | ---
Accruing TDRs | $ 27,718 | $ 30,347 | $ 33,416 | $ 33,691 | $ 30,045 | $ 29,722
Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs | 20,343 |  | 20,472 |  |  |
Contractual Interest Rate Reduction [Member] |  |  |  |  |  |
Accruing TDRs |  |  | 1,677 |  |  |
Rate Reduction and Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs | 7,375 |  | 11,267 |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |
Accruing TDRs | 14,579 |  | 12,944 |  |  |
Commercial Portfolio Segment [Member] | Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs | 14,579 |  | 12,944 |  |  |
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 | 11,124 |  | 19,021 |  |  |
Commercial Real Estate Portfolio Segment [Member] | Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs | 3,863 |  | 6,231 |  |  |
Commercial Real Estate Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member] |  |  |  |  |  |
Accruing TDRs |  |  | 1,677 |  |  |
Commercial Real Estate Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs | 7,261 |  | 11,113 |  |  |
Residential Portfolio Segment [Member] |  |  |  |  |  |
Accruing TDRs | 2,015 |  | 1,451 |  |  |
Residential Portfolio Segment [Member] | Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs | 1,901 |  | 1,297 |  |  |
Residential Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member] |  |  |  |  |  |
Accruing TDRs |  |  |  |  |  |
Residential Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs | $ 114 |  | $ 154 |  |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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