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Note 3 - Loans Receivable and Allowance for Loan Losses - Impaired Loans (Additional Information) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Impaired loans with a related allowance recorded, average recorded investment | $ 232 | $ 2,979 | $ 232 | $ 1,916
Impaired loans with a related allowance recorded, interest income recognized |  |  |  |
Impaired loans, average recorded investment | 8,905 | 15,689 | 8,932 | 14,742
Impaired loans, interest income recognized | 83 | 115 | 163 | 230
Impaired loans with no related allowance recorded, average recorded investment | 8,673 | 12,710 | 8,700 | 12,826
Impaired loans with no allowance recorded, interest income recognized | 83 | 115 | 163 | 230
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Impaired loans with a related allowance recorded, average recorded investment |  |  | 232 | 1,914
Impaired loans with a related allowance recorded, interest income recognized |  |  |  |
Impaired loans, average recorded investment | 6,188 | 7,524 | 6,213 | 7,597
Impaired loans, interest income recognized | 75 | 79 | 148 | 159
Impaired loans with no related allowance recorded, average recorded investment | 6,188 | 7,524 | 6,213 | 7,597
Impaired loans with no allowance recorded, interest income recognized | 75 | 79 | 148 | 159
Residential Portfolio Segment [Member] |  |  |  |
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 | 1,907 | 4,525 | 1,909 | 4,535
Impaired loans, interest income recognized | 3 | 31 | 5 | 62
Impaired loans with no related allowance recorded, average recorded investment | 1,907 | 4,525 | 1,909 | 4,535
Impaired loans with no allowance recorded, interest income recognized | 3 | 31 | 5 | 62
Commercial Portfolio Segment [Member] |  |  |  |
Impaired loans with a related allowance recorded, average recorded investment | 232 | 2,977 |  |
Impaired loans with a related allowance recorded, interest income recognized |  |  |  |
Impaired loans, average recorded investment | 269 | 3,093 | 269 | 2,062
Impaired loans, interest income recognized |  |  |  |
Impaired loans with no related allowance recorded, average recorded investment | 37 | 116 | 37 | 148
Impaired loans with no allowance recorded, interest income recognized |  |  |  |
Consumer Portfolio Segment [Member] |  |  |  |
Impaired loans with a related allowance recorded, average recorded investment |  | 2 |  | 2
Impaired loans with a related allowance recorded, interest income recognized |  |  |  |
Impaired loans, average recorded investment | 541 | 547 | 541 | 548
Impaired loans, interest income recognized | 5 | 5 | 10 | 9
Impaired loans with no related allowance recorded, average recorded investment | 541 | 545 | 541 | 546
Impaired loans with no allowance recorded, interest income recognized | $ 5 | $ 5 | $ 10 | $ 9

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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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