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Note 8 - Loans - Impaired Loans and Related Allowance for Credit Losses (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Loans with no related allowance, unpaid principal balance | $ 106,639 | $ 77,605
Loans with no related allowance, recorded investment | 92,231 | 65,315
Loans with related allowance, unpaid principal balance | 28,462 | 42,686
Loans with related allowance, recorded investment | 27,400 | 41,571
Allowance | 1,414 | 3,802
Total impaired loans, unpaid principal balance | 135,101 | 120,291
Total impaired loans, recorded investment | 119,631 | 106,886
Commercial Portfolio Segment [Member] |  |
Loans with no related allowance, unpaid principal balance | 45,590 | 32,015
Loans with no related allowance, recorded investment | 42,220 | 30,368
Loans with related allowance, unpaid principal balance | 950 | 6,653
Loans with related allowance, recorded investment | 939 | 6,570
Allowance | 498 | 1,837
Real Estate Construction Portfolio Segment [Member] |  |
Loans with no related allowance, unpaid principal balance | 5,776 | 5,776
Loans with no related allowance, recorded investment | 4,801 | 4,873
Commercial Real Estate Portfolio Segment [Member] |  |
Loans with no related allowance, unpaid principal balance | 48,151 | 34,129
Loans with no related allowance, recorded investment | 38,114 | 24,409
Loans with related allowance, unpaid principal balance | 20,289 | 27,099
Loans with related allowance, recorded investment | 20,238 | 27,063
Allowance | 667 | 877
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans with no related allowance, unpaid principal balance | 7,122 | 5,685
Loans with no related allowance, recorded investment | 7,096 | 5,665
Loans with related allowance, unpaid principal balance | 7,223 | 8,934
Loans with related allowance, recorded investment | 6,223 | 7,938
Allowance | $ 249 | $ 1,088

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953550-111524 + Details
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