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Note 7 - Fair Value Measurements - Assets and Liabilities at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Securities available for sale | $ 489,926 | $ 435,263
Fair Value, Inputs, Level 2 [Member] |  |
Securities available for sale | 489,926 | 435,263
US Government Agencies Debt Securities [Member] |  |
Securities available for sale | 73,526 | 121,123
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available for sale | 73,526 | 121,123
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available for sale | 150,880 | 88,239
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available for sale | 150,880 | 88,239
Collateralized Mortgage Backed Securities [Member] |  |
Securities available for sale | 262,232 | 221,783
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available for sale | 262,232 | 221,783
Corporate Debt Securities [Member] |  |
Securities available for sale | 3,288 | 4,118
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available for sale | $ 3,288 | $ 4,118

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