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Note 5 - Loans - Impaired Loans and Related Allowance for Credit Losses (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Loans with no related allowance, unpaid principal balance | $ 95,807 | $ 129,970
Loans with no related allowance, recorded investment | 88,342 | 86,374
Loans with related allowance, unpaid principal balance | 28,637 | 50,398
Loans with related allowance, recorded investment | 26,732 | 47,436
Allowance | 2,796 | 7,749
Total impaired loans, unpaid principal balance | 124,444 | 180,368
Total impaired loans, recorded investment | 115,074 | 133,810
Commercial Portfolio Segment [Member] |  |
Loans with no related allowance, unpaid principal balance | 24,037 | 15,493
Loans with no related allowance, recorded investment | 23,121 | 6,721
Loans with related allowance, unpaid principal balance | 5,216 | 7,757
Loans with related allowance, recorded investment | 4,640 | 6,847
Allowance | 1,827 | 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 | 5,458 | 22,002
Commercial Real Estate Portfolio Segment [Member] |  |
Loans with no related allowance, unpaid principal balance | 60,522 | 59,954
Loans with no related allowance, recorded investment | 54,453 | 54,625
Loans with related allowance, unpaid principal balance | 10,158 | 28,258
Loans with related allowance, recorded investment | 10,017 | 27,152
Allowance | 573 | 6,792
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans with no related allowance, unpaid principal balance | 5,472 | 3,233
Loans with no related allowance, recorded investment | 5,310 | 3,026
Loans with related allowance, unpaid principal balance | 13,263 | 14,383
Loans with related allowance, recorded investment | 12,075 | 13,437
Allowance | $ 396 | $ 427

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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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