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Note 5 - Loans - Troubled Debt Restructurings That Are Not Performing According to Their Restructured Terms (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 USD ($) | Sep. 30, 2018 | Dec. 31, 2018 USD ($)
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | 0 | 0 | 0 | 0 |
Nonperforming Financial Instruments [Member] |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts |  |  | 5 |  | 2
Recorded investment, not performing |  |  | $ 1,046 |  | $ 1,785
Multi-family Residential Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts |  |  | 0 |  | 1
Recorded investment, not performing |  |  | $ 0 |  | $ 388
Taxi Medallion Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts |  |  | 3 |  | 0
Recorded investment, not performing |  |  | $ 767 |  | $ 0
Commercial Business and Other Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts |  |  | 2 |  | 1
Recorded investment, not performing |  |  | $ 279 |  | $ 1,397

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