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Note 3 - Loans and Allowance for Loan Losses - Troubled Debt Restructurings That Are Not Performing According to Their Restructured Terms (Details) - Nonperforming Financial Instruments [Member] $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Number of contracts | 2 | 1
Recorded investment | $ 1,785 | $ 383
Multi-family Residential Portfolio Segment [Member] |  |
Number of contracts | 1 | 1
Recorded investment | $ 388 | $ 383
Commercial Business and Other Portfolio Segment [Member] |  |
Number of contracts | 1 |
Recorded investment | $ 1,397 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=84173941&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953682-111524 + Details
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