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Note 7 - Loans - Impaired Loans and Related Allowance for Credit Losses (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Loans with no related allowance, unpaid principal balance | $ 122,264 | $ 95,807
Loans with no related allowance, recorded investment | 115,182 | 88,342
Loans with related allowance, unpaid principal balance | 33,279 | 28,637
Loans with related allowance, recorded investment | 28,681 | 26,732
Total impaired loans, unpaid principal balance | 155,543 | 124,444
Total impaired loans, recorded investment | 143,863 | 115,074
Allowance | 1,561 | 2,796
Commercial Portfolio Segment [Member] |  |
Loans with no related allowance, unpaid principal balance | 18,200 | 24,037
Loans with no related allowance, recorded investment | 17,826 | 23,121
Loans with related allowance, unpaid principal balance | 3,665 | 5,216
Loans with related allowance, recorded investment | 1,032 | 4,640
Allowance | 145 | 1,827
Real Estate Construction Portfolio Segment [Member] |  |
Loans with no related allowance, unpaid principal balance | 45,545 | 5,776
Loans with no related allowance, recorded investment | 45,057 | 5,458
Commercial Real Estate Portfolio Segment [Member] |  |
Loans with no related allowance, unpaid principal balance | 55,599 | 60,522
Loans with no related allowance, recorded investment | 49,379 | 54,453
Loans with related allowance, unpaid principal balance | 16,515 | 10,158
Loans with related allowance, recorded investment | 15,934 | 10,017
Allowance | 1,018 | 573
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans with no related allowance, unpaid principal balance | 2,920 | 5,472
Loans with no related allowance, recorded investment | 2,920 | 5,310
Loans with related allowance, unpaid principal balance | 13,099 | 13,263
Loans with related allowance, recorded investment | 11,715 | 12,075
Allowance | $ 398 | $ 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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