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Note 8 - Loans - Impaired Loans and Related Allowance for Credit Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Loans with no related allowance, unpaid principal balance | $ 87,680 | $ 95,807
Loans with no related allowance, recorded investment | 79,755 | 88,342
Loans with related allowance, unpaid principal balance | 49,604 | 28,637
Loans with related allowance, recorded investment | 47,916 | 26,732
Allowance | 2,606 | 2,796
Total impaired loans, unpaid principal balance | 137,284 | 124,444
Total impaired loans, recorded investment | 127,671 | 115,074
Commercial Portfolio Segment [Member] |  |
Loans with no related allowance, unpaid principal balance | 23,953 | 24,037
Loans with no related allowance, recorded investment | 23,373 | 23,121
Loans with related allowance, unpaid principal balance | 14,082 | 5,216
Loans with related allowance, recorded investment | 13,985 | 4,640
Allowance | 1,461 | 1,827
Real Estate Construction Portfolio Segment [Member] |  |
Loans with no related allowance, unpaid principal balance | 22,309 | 5,776
Loans with no related allowance, recorded investment | 21,748 | 5,458
Commercial Real Estate Portfolio Segment [Member] |  |
Loans with no related allowance, unpaid principal balance | 39,154 | 60,522
Loans with no related allowance, recorded investment | 32,370 | 54,453
Loans with related allowance, unpaid principal balance | 23,061 | 10,158
Loans with related allowance, recorded investment | 22,820 | 10,017
Allowance | 823 | 573
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans with no related allowance, unpaid principal balance | 2,264 | 5,472
Loans with no related allowance, recorded investment | 2,264 | 5,310
Loans with related allowance, unpaid principal balance | 12,461 | 13,263
Loans with related allowance, recorded investment | 11,111 | 12,075
Allowance | $ 322 | $ 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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