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Note 5 - Loans - Impaired Loans and Related Allowance for Credit Losses (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Loans with no related allowance, unpaid principal balance | $ 91,430 | $ 95,807
Loans with no related allowance, recorded investment | 83,217 | 88,342
Loans with related allowance, unpaid principal balance | 35,646 | 28,637
Loans with related allowance, recorded investment | 34,136 | 26,732
Allowance | 2,134 | 2,796
Total impaired loans, unpaid principal balance | 127,076 | 124,444
Total impaired loans, recorded investment | 117,353 | 115,074
Commercial Portfolio Segment [Member] |  |
Loans with no related allowance, unpaid principal balance | 43,483 | 24,037
Loans with no related allowance, recorded investment | 42,702 | 23,121
Loans with related allowance, unpaid principal balance | 891 | 5,216
Loans with related allowance, recorded investment | 793 | 4,640
Allowance | 43 | 1,827
Real Estate Construction Portfolio Segment [Member] |  |
Loans with no related allowance, unpaid principal balance | 8,821 | 5,776
Loans with no related allowance, recorded investment | 8,185 | 5,458
Commercial Real Estate Portfolio Segment [Member] |  |
Loans with no related allowance, unpaid principal balance | 37,825 | 60,522
Loans with no related allowance, recorded investment | 31,029 | 54,453
Loans with related allowance, unpaid principal balance | 21,733 | 10,158
Loans with related allowance, recorded investment | 21,635 | 10,017
Allowance | 1,738 | 573
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans with no related allowance, unpaid principal balance | 1,301 | 5,472
Loans with no related allowance, recorded investment | 1,301 | 5,310
Loans with related allowance, unpaid principal balance | 13,022 | 13,263
Loans with related allowance, recorded investment | 11,708 | 12,075
Allowance | $ 353 | $ 396

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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://www.xbrl.org/2003/role/presentationRef -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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