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Note 19 - Derivative Financial Instruments - Effect of Master Netting Arrangements on Derivative Assets and Liabilities in the Consolidated Statements of Condition (Details) - Interest Rate Swap [Member] - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Interest Rate Swaps, Gross Amount of Recognized Assets | $ 7,388 | $ 6,350
Interest Rate Swaps, Gross Amount Offset in the Statement of Condition |  |
Interest Rate Swaps, Net Amount of Assets Presented in the Statement of Condition | 7,388 | 6,350
Interest Rate Swaps, Financial Instruments |  |
Interest Rate Swaps, Cash Collateral Received | 3,660 | 2,964
Interest Rate Swaps, Net Amount | 3,728 | 3,386
Interest Rate Swaps, Gross Amount of Recognized Liabilities | 3,758 | 3,386
Interest Rate Swaps, Gross Amount Offset in the Statement of Condition |  |
Interest Rate Swaps, Net Amount of Liabilities Presented in the Statement of Condition | 3,758 | 3,386
Interest Rate Swaps, Financial Instruments |  |
Interest Rate Swaps, Cash Collateral Received |  |
Interest Rate Swaps, Net Amount | $ 3,758 | 3,386
Interest Rate Swaps, Gross Amount Offset in the Statement of Condition |  |

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