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Note 15 - Fair Value Measurements - Assets and Liabilities at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Securities available for sale | $ 656,852 | $ 686,080
Fair Value, Inputs, Level 1 [Member] |  |
Securities available for sale | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Securities available for sale | 656,852 | 686,080
Fair Value, Inputs, Level 3 [Member] |  |
Securities available for sale | 0 | 0
US Government Agencies Debt Securities [Member] |  |
Securities available for sale | 336,575 | 278,019
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available for sale | 0 | 0
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available for sale | 336,575 | 278,019
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available for sale | 0 | 0
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available for sale | 152,200 | 198,672
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available for sale | 0 | 0
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available for sale | 152,200 | 198,672
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available for sale | 0 | 0
Collateralized Mortgage-Backed Securities [Member] |  |
Securities available for sale | 161,477 | 206,174
Collateralized Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available for sale | 0 | 0
Collateralized Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available for sale | 161,477 | 206,174
Collateralized Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available for sale | 0 | 0
Corporate Debt Securities [Member] |  |
Securities available for sale | 5,664 | 3,215
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available for sale | 0 | 0
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available for sale | 5,664 | 3,215
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available for sale | 0 | $ 0
US Treasury Securities [Member] |  |
Securities available for sale | 936 |
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available for sale |  |
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available for sale | 936 |
US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available for sale |  |

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