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Note 3 - Loans Receivable and Allowance for Loan Losses - Impaired Loans (Additional Information) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Impaired loans with no related allowance recorded, average recorded investment | $ 8,687 | $ 12,358
Impaired loans with no allowance recorded, interest income recognized | 81 | 127
Impaired loans with a related allowance recorded, average recorded investment | 231 | 2,979
Impaired loans with a related allowance recorded, interest income recognized |  |
Impaired loans, average recorded investment | 8,918 | 15,337
Impaired loans, interest income recognized | 81 | 127
Commercial Real Estate Portfolio Segment [Member] |  |
Impaired loans with no related allowance recorded, average recorded investment | 6,236 | 7,270
Impaired loans with no allowance recorded, interest income recognized | 73 | 91
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 | 6,236 | 7,270
Impaired loans, interest income recognized | 73 | 91
Residential Portfolio Segment [Member] |  |
Impaired loans with no related allowance recorded, average recorded investment | 1,910 | 4,542
Impaired loans with no allowance recorded, interest income recognized | 3 | 31
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 | 1,910 | 4,542
Impaired loans, interest income recognized | 3 | 31
Commercial Portfolio Segment [Member] |  |
Impaired loans with no related allowance recorded, average recorded investment |  |
Impaired loans with no allowance recorded, interest income recognized |  |
Impaired loans with a related allowance recorded, average recorded investment | 231 | 2,977
Impaired loans with a related allowance recorded, interest income recognized |  |
Impaired loans, average recorded investment | 231 | 2,977
Impaired loans, interest income recognized |  |
Consumer Portfolio Segment [Member] |  |
Impaired loans with no related allowance recorded, average recorded investment | 541 | 546
Impaired loans with no allowance recorded, interest income recognized | 5 | 5
Impaired loans with a related allowance recorded, average recorded investment |  | 2
Impaired loans with a related allowance recorded, interest income recognized |  |
Impaired loans, average recorded investment | 541 | 548
Impaired loans, interest income recognized | $ 5 | $ 5

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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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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- Definition Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
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- Definition Amount of average investment of impaired financing receivables for which there is no 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 17 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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