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Note 3 - Loans and Allowance for Loan Losses - Loans Modified and Classified as TDR (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Financing Receivable, Modifications, Number of Contracts | 1 | 10 | 15
Financing Receivable, Modifications, Balance | $ 1,620 | $ 6,741 | $ 10,351
Commercial Business and Other [Member] | Extended Maturity [Member] |  |  |
Financing Receivable, Modifications, Number of Contracts | 1 |  |
Financing Receivable, Modifications, Balance | $ 1,620 |  |
Taxi Medallion Portfolio Segment [Member] | Extended Maturity [Member] |  |  |
Financing Receivable, Modifications, Number of Contracts |  | 10 |
Financing Receivable, Modifications, Balance |  | $ 6,741 |
Taxi Medallion Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member] |  |  |
Financing Receivable, Modifications, Number of Contracts |  |  | 12
Financing Receivable, Modifications, Balance |  |  | $ 9,764
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member] |  |  |
Financing Receivable, Modifications, Number of Contracts |  |  | 2
Financing Receivable, Modifications, Balance |  |  | $ 263
Commercial Business and Other Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member] |  |  |
Financing Receivable, Modifications, Number of Contracts |  |  | 1
Financing Receivable, Modifications, Balance |  |  | $ 324

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