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Note 8 - Loans - Impaired Loans and Related Allowance for Credit Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Loans with no related allowance, unpaid principal balance | $ 87,269 | $ 91,430
Loans with no related allowance, recorded investment | 77,166 | 83,217
Loans with related allowance, unpaid principal balance | 41,011 | 35,646
Loans with related allowance, recorded investment | 39,843 | 34,136
Allowance | 3,704 | 2,134
Total impaired loans, unpaid principal balance | 128,280 | 127,076
Total impaired loans, recorded investment | 117,009 | 117,353
Commercial Portfolio Segment [Member] |  |
Loans with no related allowance, unpaid principal balance | 40,426 | 43,483
Loans with no related allowance, recorded investment | 38,556 | 42,702
Loans with related allowance, unpaid principal balance | 5,792 | 891
Loans with related allowance, recorded investment | 5,715 | 793
Allowance | 2,506 | 43
Real Estate Construction Portfolio Segment [Member] |  |
Loans with no related allowance, unpaid principal balance | 5,776 | 8,821
Loans with no related allowance, recorded investment | 4,922 | 8,185
Commercial Real Estate Portfolio Segment [Member] |  |
Loans with no related allowance, unpaid principal balance | 34,276 | 37,825
Loans with no related allowance, recorded investment | 26,912 | 31,029
Loans with related allowance, unpaid principal balance | 27,549 | 21,733
Loans with related allowance, recorded investment | 27,523 | 21,635
Allowance | 917 | 1,738
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans with no related allowance, unpaid principal balance | 6,791 | 1,301
Loans with no related allowance, recorded investment | 6,776 | 1,301
Loans with related allowance, unpaid principal balance | 7,670 | 13,022
Loans with related allowance, recorded investment | 6,605 | 11,708
Allowance | $ 281 | $ 353

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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524 + Details
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