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Note 7 - Loans - Impaired Loans and Related Allowance for Credit Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
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Commercial Portfolio Segment [Member] |  |
Loans with no related allowance, unpaid principal balance | $ 29,794 | $ 15,493
Loans with no related allowance, recorded investment | 29,414 | 6,721
Loans with related allowance, unpaid principal balance | 3,315 | 7,757
Loans with related allowance, recorded investment | 3,217 | 6,847
Allowance | 1,320 | 530
Real Estate Construction Portfolio Segment [Member] |  |
Loans with no related allowance, unpaid principal balance | 5,776 | 51,290
Loans with no related allowance, recorded investment | 5,507 | 22,002
Commercial Real Estate Portfolio Segment [Member] |  |
Loans with no related allowance, unpaid principal balance | 72,319 | 59,954
Loans with no related allowance, recorded investment | 64,298 | 54,625
Loans with related allowance, unpaid principal balance | 10,425 | 28,258
Loans with related allowance, recorded investment | 10,289 | 27,152
Allowance | 1,248 | 6,792
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans with no related allowance, unpaid principal balance | 4,832 | 3,233
Loans with no related allowance, recorded investment | 4,675 | 3,026
Loans with related allowance, unpaid principal balance | 14,637 | 14,383
Loans with related allowance, recorded investment | 13,514 | 13,437
Allowance | 375 | 427
Loans with no related allowance, unpaid principal balance | 112,721 | 129,970
Loans with no related allowance, recorded investment | 103,894 | 86,374
Loans with related allowance, unpaid principal balance | 28,377 | 50,398
Loans with related allowance, recorded investment | 27,020 | 47,436
Allowance | 2,943 | 7,749
Total impaired loans, Unpaid Principal Balance | 141,098 | 180,368
Total impaired loans, Recorded Investment | $ 130,914 | $ 133,810

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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=66008989&loc=SL6953550-111524 + Details
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- Definition Amount of allowance for credit losses related to recorded investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Recorded Investment -URI http://asc.fasb.org/extlink&oid=65880944 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524 + Details
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