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Note 4 - Loans Receivable and Allowance for Loan Losses - Impaired Loans (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Impaired loans with no related allowance recorded, recorded investment | $ 7,932,000 |  | $ 6,500,000
Impaired loans with no related allowance recorded, unpaid principal balance | 7,932,000 |  | 7,295,000
Impaired loans with a related allowance recorded, recorded investment | 55,000 |  | 253,000
Impaired loans with a related allowance recorded, unpaid principal balance | 55,000 |  | 253,000
Impaired loans, related allowance | 55,000 |  | 253,000
Impaired loans, recorded investment | 7,987,000 |  | 6,753,000
Impaired loans, unpaid principal balance | 7,987,000 |  | 7,548,000
Impaired loans with no related allowance recorded, average recorded investment | 6,977,000 | $ 8,687,000 |
Impaired loans with no allowance recorded, interest income recognized | 35,000 | 81,000 |
Impaired loans with a related allowance recorded, average recorded investment | 395,000 | 231,000 |
Impaired loans with a related allowance recorded, interest income recognized |  |  |
Impaired loans, average recorded investment | 7,372,000 | 8,918,000 |
Impaired loans, interest income recognized | 35,000 | 81,000 |
Commercial Real Estate Portfolio Segment [Member] |  |  |
Impaired loans with no related allowance recorded, recorded investment | 2,429,000 |  | 1,977,000
Impaired loans with no related allowance recorded, unpaid principal balance | 2,429,000 |  | 2,425,000
Impaired loans with a related allowance recorded, recorded investment |  |  |
Impaired loans with a related allowance recorded, unpaid principal balance |  |  |
Impaired loans, related allowance |  |  |
Impaired loans, recorded investment | 2,429,000 |  | 1,977,000
Impaired loans, unpaid principal balance | 2,429,000 |  | 2,425,000
Impaired loans with no related allowance recorded, average recorded investment | 2,205,000 | 6,236,000 |
Impaired loans with no allowance recorded, interest income recognized | 25,000 | 73,000 |
Impaired loans with a related allowance recorded, average recorded investment |  |  |
Impaired loans with a related allowance recorded, interest income recognized |  |  |
Impaired loans, average recorded investment | 2,205,000 | 6,236,000 |
Impaired loans, interest income recognized | 25,000 | 73,000 |
Residential Portfolio Segment [Member] |  |  |
Impaired loans with no related allowance recorded, recorded investment | 3,343,000 |  | 3,336,000
Impaired loans with no related allowance recorded, unpaid principal balance | 3,343,000 |  | 3,369,000
Impaired loans with a related allowance recorded, recorded investment |  |  |
Impaired loans with a related allowance recorded, unpaid principal balance |  |  |
Impaired loans, related allowance |  |  |
Impaired loans, recorded investment | 3,343,000 |  | 3,336,000
Impaired loans, unpaid principal balance | 3,343,000 |  | 3,369,000
Impaired loans with no related allowance recorded, average recorded investment | 3,342,000 | 1,910,000 |
Impaired loans with no allowance recorded, interest income recognized | 3,000 | 3,000 |
Impaired loans with a related allowance recorded, average recorded investment |  |  |
Impaired loans with a related allowance recorded, interest income recognized |  |  |
Impaired loans, average recorded investment | 3,342,000 | 1,910,000 |
Impaired loans, interest income recognized | 3,000 | 3,000 |
Commercial Portfolio Segment [Member] |  |  |
Impaired loans with no related allowance recorded, recorded investment | 1,470,000 |  | 497,000
Impaired loans with no related allowance recorded, unpaid principal balance | 1,470,000 |  | 683,000
Impaired loans with a related allowance recorded, recorded investment | 51,000 |  | 251,000
Impaired loans with a related allowance recorded, unpaid principal balance | 51,000 |  | 251,000
Impaired loans, related allowance | 51,000 |  | 251,000
Impaired loans, recorded investment | 1,521,000 |  | 748,000
Impaired loans, unpaid principal balance | 1,521,000 |  | 934,000
Impaired loans with no related allowance recorded, average recorded investment | 739,000 |  |
Impaired loans with no allowance recorded, interest income recognized |  |  |
Impaired loans with a related allowance recorded, average recorded investment | 393,000 | 231,000 |
Impaired loans with a related allowance recorded, interest income recognized |  |  |
Impaired loans, average recorded investment | 1,132,000 | 231,000 |
Impaired loans, interest income recognized |  |  |
Consumer Portfolio Segment [Member] |  |  |
Impaired loans with no related allowance recorded, recorded investment | 690,000 |  | 690,000
Impaired loans with no related allowance recorded, unpaid principal balance | 690,000 |  | 818,000
Impaired loans with a related allowance recorded, recorded investment | 4,000 |  | 2,000
Impaired loans with a related allowance recorded, unpaid principal balance | 4,000 |  | 2,000
Impaired loans, related allowance | 4,000 |  | 2,000
Impaired loans, recorded investment | 694,000 |  | 692,000
Impaired loans, unpaid principal balance | 694,000 |  | $ 820,000
Impaired loans with no related allowance recorded, average recorded investment | 691,000 | 541,000 |
Impaired loans with no allowance recorded, interest income recognized | 7,000 | 5,000 |
Impaired loans with a related allowance recorded, average recorded investment | 2,000 |  |
Impaired loans with a related allowance recorded, interest income recognized |  |  |
Impaired loans, average recorded investment | 693,000 | 541,000 |
Impaired loans, interest income recognized | $ 7,000 | $ 5,000 |

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- Definition Average 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 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524 + Details
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