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Note 4 - Loans Receivable and Allowance for Loan Losses - Impaired Loans (Additional Information) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
With no allowance recorded, average recorded investment | $ 12,056 | $ 12,063 | $ 13,786
With no allowance recorded, interest income recognized | 340 | 517 | 494
With allowance recorded, average recorded investment | 2,205 | 3 | 7
With allowance recorded, interest income recognized |  |  |
Impaired Loans, Average recorded investment | 14,261 | 12,066 | 13,793
Impaired Loans, interest income recognized | 340 | 517 | 494
Commercial Real Estate Portfolio Segment [Member] |  |  |
With no allowance recorded, average recorded investment | 6,929 | 8,001 | 8,262
With no allowance recorded, interest income recognized | 312 | 373 | 342
With allowance recorded, average recorded investment | 65 |  |
With allowance recorded, interest income recognized |  |  |
Impaired Loans, Average recorded investment | 6,994 | 8,001 | 8,262
Impaired Loans, interest income recognized | 312 | 373 | 342
Residential Portfolio Segment [Member] |  |  |
With no allowance recorded, average recorded investment | 4,318 | 3,512 | 4,734
With no allowance recorded, interest income recognized | 9 | 126 | 129
Impaired Loans, Average recorded investment | 4,318 | 3,512 | 4,734
Impaired Loans, interest income recognized | 9 | 126 | 129
Commercial Portfolio Segment [Member] |  |  |
With no allowance recorded, average recorded investment | 265 |  | 215
With no allowance recorded, interest income recognized |  |  |
With allowance recorded, average recorded investment | 2,138 |  |
With allowance recorded, interest income recognized |  |  |
Impaired Loans, Average recorded investment | 2,403 |  | 215
Impaired Loans, interest income recognized |  |  |
Consumer Portfolio Segment [Member] |  |  |
With no allowance recorded, average recorded investment | 544 | 550 | 575
With no allowance recorded, interest income recognized | 19 | 18 | 23
With allowance recorded, average recorded investment | 2 | 3 | 7
With allowance recorded, interest income recognized |  |  |
Impaired Loans, Average recorded investment | 546 | 553 | 582
Impaired Loans, interest income recognized | $ 19 | $ 18 | $ 23

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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=66008989&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=66008989&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=66008989&loc=d3e5212-111524 + Details
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