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Note 5 - Loans - Troubled Debt Restructuring Activity (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Charge-offs | $ (305) | $ (830) | $ (148)
Accruing Troubled Debt Restructuring [Member] |  |  |
Beginning balance | 65,393 | 81,680 | 104,356
New restructurings | 73,426 | 26,965 | 17,752
Restructured loans restored to accrual status |  | 10,303 | 723
Charge-offs |  | (88) | (104)
Payments | (54,095) | (24,192) | (30,858)
Restructured loans placed on non-accrual | (13,919) | (13,984) | (10,189)
Expiration of loan concession | (2,240) | (15,291) |
Ending balance | 68,565 | 65,393 | 81,680
Non-accruing Troubled Debt Restructuring [Member] |  |  |
Beginning balance | 29,722 | 39,923 | 41,618
New restructurings | 4,009 | 6,940 | 2,006
Restructured loans restored to accrual status |  | (10,303) | (723)
Charge-offs | (1,650) | (5,271) | (3,246)
Payments | (11,341) | (15,551) | (9,921)
Restructured loans placed on non-accrual | 13,919 | 13,984 | 10,189
Foreclosures | (1,243) |  |
Ending balance | $ 33,416 | $ 29,722 | $ 39,923

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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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