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Note 8 - Loans - Troubled Debt Restructuring Activity (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017
Charge-offs | $ (305) |  | $ (305) |  |
Accruing Troubled Debt Restructuring [Member] |  |  |  |  |
Beginning balance | 79,819 | 74,708 | 65,393 | 81,680 | $ 86,555
New restructurings | 21,790 | 18,347 | 49,973 | 20,412 |
Restructured loans restored to accrual status |  |  |  | 10,303 |
Payments | (35,677) | (6,500) | (41,372) | (9,816) |
Restructured loans placed on non-accrual status | (3,574) |  | (9,396) | (1,138) |
Expiration of loan concession upon renewal |  |  | (2,240) | (14,886) |
Ending balance | 62,358 | 86,555 | 62,358 | 86,555 | 62,358
Non-accruing Troubled Debt Restructuring [Member] |  |  |  |  |
Beginning balance | 30,045 | 25,442 | 29,722 | 39,923 | 20,870
New restructurings | 2,360 | 649 | 2,360 | 3,794 |
Restructured loans restored to accrual status | 3,574 |  | 9,396 | 1,138 |
Payments | (1,933) | (1,814) | (5,160) | (9,330) |
Restructured loans placed on non-accrual status |  |  |  | (10,303) |
Charge-offs | (355) | (3,407) | (1,901) | (4,352) |
Foreclosures |  |  | (726) |  |
Ending balance | $ 33,691 | $ 20,870 | $ 33,691 | $ 20,870 | $ 33,691

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- Definition Represents information about troubled debt restructurings, expiration of loan concession upon renewal. + References No definition available. + Details
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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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- Definition Reflects the amount of the write-down related to a troubled debt restructuring. + 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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