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Note 8 - Loans - Troubled Debt Restructuring (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($)
No. of Contracts | 14 | 8 | 21 | 14 |
Pre-Modification Outstanding Recorded Investment | $ 23,479,000 | $ 18,996,000 | $ 52,638,000 | $ 24,207,000 |
Post-Modification Outstanding Recorded Investment | 23,174,000 | 18,996,000 | 52,333,000 | 24,207,000 |
Charge-offs | 305,000 |  | 305,000 |  |
Special Reserve | $ 678,000 | $ 208,000 | $ 678,000 | $ 208,000 | $ 678,000
Commercial Portfolio Segment [Member] |  |  |  |  |
No. of Contracts | 8 | 7 | 13 | 11 |
Pre-Modification Outstanding Recorded Investment | $ 18,873,000 | $ 18,258,000 | $ 19,543,000 | $ 23,102,000 |
Post-Modification Outstanding Recorded Investment | 18,873,000 | 18,258,000 | 19,543,000 | 23,102,000 |
Charge-offs |  |  |  |  | 2,100,000
Special Reserve | $ 636,000 | $ 208,000 | $ 636,000 | $ 208,000 | 636,000
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
No. of Contracts | 5 | 1 | 5 | 1 |
Pre-Modification Outstanding Recorded Investment | $ 4,123,000 | $ 738,000 | $ 4,123,000 | $ 738,000 |
Post-Modification Outstanding Recorded Investment | 3,818,000 | 738,000 | 3,818,000 | 738,000 |
Charge-offs | 305,000 |  | 305,000 |  |
Special Reserve | 10,000 |  | $ 10,000 |  | 10,000
Real Estate Construction Portfolio Segment [Member] |  |  |  |  |
No. of Contracts |  |  | 2 |  |
Pre-Modification Outstanding Recorded Investment |  |  | $ 28,489,000 |  |
Post-Modification Outstanding Recorded Investment |  |  | 28,489,000 |  |
Charge-offs |  |  |  |  |
Special Reserve |  |  |  |  |
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |  |  |  |
No. of Contracts | 1 |  | 1 | 2 |
Pre-Modification Outstanding Recorded Investment | $ 483,000 |  | $ 483,000 | $ 367,000 |
Post-Modification Outstanding Recorded Investment | 483,000 |  | 483,000 | 367,000 |
Charge-offs |  |  |  |  |
Special Reserve | $ 32,000 |  | $ 32,000 |  | $ 32,000

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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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