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Note 8 - Loans - Accruing Troubled Debt Restructurings (Details) - Accruing Troubled Debt Restructuring [Member] - USD ($) $ in Thousands | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | --- | --- | --- | --- | ---
Accruing TDRs | $ 62,358 | $ 79,819 | $ 65,393 | $ 86,555 | $ 74,708 | $ 81,680
Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs | 48,542 |  | 39,054 |  |  |
Contractual Interest Rate Reduction [Member] |  |  |  |  |  |
Accruing TDRs | 6,232 |  | 6,750 |  |  |
Rate Reduction and Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs | 7,584 |  | 19,589 |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |
Accruing TDRs | 21,416 |  | 12,052 |  |  |
Commercial Portfolio Segment [Member] | Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs | 21,416 |  | 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 |  |  |
Real Estate Construction Loans [Member] |  |  |  |  |  |
Accruing TDRs | 7,480 |  |  |  |  |
Real Estate Construction Loans [Member] | Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs | 7,480 |  |  |  |  |
Real Estate Construction Loans [Member] | Contractual Interest Rate Reduction [Member] |  |  |  |  |  |
Accruing TDRs |  |  |  |  |  |
Real Estate Construction Loans [Member] | Rate Reduction and Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs |  |  |  |  |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Accruing TDRs | 26,812 |  | 44,392 |  |  |
Commercial Real Estate Portfolio Segment [Member] | Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs | 16,130 |  | 25,979 |  |  |
Commercial Real Estate Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member] |  |  |  |  |  |
Accruing TDRs | 5,895 |  | 5,961 |  |  |
Commercial Real Estate Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs | 4,787 |  | 12,452 |  |  |
Residential Portfolio Segment [Member] |  |  |  |  |  |
Accruing TDRs | 6,650 |  | 8,949 |  |  |
Residential Portfolio Segment [Member] | Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs | 3,516 |  | 5,104 |  |  |
Residential Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member] |  |  |  |  |  |
Accruing TDRs | 337 |  | 789 |  |  |
Residential Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs | $ 2,797 |  | $ 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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