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Note 5 - Loans - Troubled Debt Restructuring (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
No. of Contracts | 31 | 30 | 28
Pre-Modification Outstanding Recorded Investment | $ 77,741 | $ 34,735 | $ 19,907
Post-Modification Outstanding Recorded Investment | 77,436 | 33,905 | 19,759
Special Reserve | 1,556 | 1,780 | 752
Charge-offs | $ 305 | $ 830 | $ 148
Commercial Portfolio Segment [Member] |  |  |
No. of Contracts | 16 | 24 | 3
Pre-Modification Outstanding Recorded Investment | $ 29,590 | $ 30,215 | $ 1,181
Post-Modification Outstanding Recorded Investment | 29,590 | 29,385 | 1,181
Special Reserve | 7 | 1,746 | 2
Charge-offs |  | $ 830 |
Real Estate Construction Portfolio Segment [Member] |  |  |
No. of Contracts | 2 |  |
Pre-Modification Outstanding Recorded Investment | $ 27,683 |  |
Post-Modification Outstanding Recorded Investment | 27,683 |  |
Special Reserve |  |  |
Charge-offs |  |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |
No. of Contracts | 9 | 4 | 20
Pre-Modification Outstanding Recorded Investment | $ 19,380 | $ 4,153 | $ 17,204
Post-Modification Outstanding Recorded Investment | 19,075 | 4,153 | 17,204
Special Reserve | 1,496 | 34 | 708
Charge-offs | $ 305 |  |
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |  |
No. of Contracts | 4 | 2 | 5
Pre-Modification Outstanding Recorded Investment | $ 1,088 | $ 367 | $ 1,522
Post-Modification Outstanding Recorded Investment | 1,088 | 367 | 1,374
Special Reserve | 53 |  | 42
Charge-offs |  |  | $ 148

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- Definition Amount of allowance for credit losses related to receivables which had been measured under a general allowance for credit losses methodology that are now identified as troubled debt restructurings. + References No definition available. + Details
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- Definition Number of 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 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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- Definition Pre-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + 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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