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Note 5 - Loans - Troubled Debt Restructurings That are Not Performing According to Their Restructured Terms (Details) - Nonperforming Financial Instruments [Member] $ in Thousands | 9 Months Ended | 12 Months Ended
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Sep. 30, 2016 USD ($) | Dec. 31, 2015 USD ($)
Multi-family Residential Portfolio Segment [Member] |  |
Number of contracts | 1 | 1
Recorded investment | $ 392 | $ 391
Number of contracts | 1 | 1
Recorded investment | $ 392 | $ 391

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- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953682-111524 + Details
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- Definition Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953682-111524 + Details
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