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Note 6 - Fair Value Measurements - Assets and Liabilities at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Securities available for sale | $ 657,410 | $ 686,080
Securities available for sale | 657,410 | 686,080
Fair Value, Inputs, Level 1 [Member] |  |
Securities available for sale | 0 | 0
Securities available for sale | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Securities available for sale | 657,410 | 686,080
Securities available for sale | 657,410 | 686,080
Fair Value, Inputs, Level 3 [Member] |  |
Securities available for sale | 0 | 0
Securities available for sale | 0 | 0
US Treasury Securities [Member] |  |
Securities available for sale | 932 |
Securities available for sale | 932 |
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available for sale | 0 |
Securities available for sale | 0 |
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available for sale | 932 |
Securities available for sale | 932 |
US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available for sale | 0 |
Securities available for sale | 0 |
US Government Agencies Debt Securities [Member] |  |
Securities available for sale | 334,530 | 278,019
Securities available for sale | 334,530 | 278,019
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available for sale | 0 | 0
Securities available for sale | 0 | 0
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available for sale | 334,530 | 278,019
Securities available for sale | 334,530 | 278,019
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available for sale | 0 | 0
Securities available for sale | 0 | 0
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available for sale | 149,160 | 198,672
Securities available for sale | 149,160 | 198,672
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available for sale | 0 | 0
Securities available for sale | 0 | 0
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available for sale | 149,160 | 198,672
Securities available for sale | 149,160 | 198,672
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available for sale | 0 | 0
Securities available for sale | 0 | 0
Collateralized Mortgage-Backed Securities [Member] |  |
Securities available for sale | 167,244 | 206,174
Securities available for sale | 167,244 | 206,174
Collateralized Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available for sale | 0 | 0
Securities available for sale | 0 | 0
Collateralized Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available for sale | 167,244 | 206,174
Securities available for sale | 167,244 | 206,174
Collateralized Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available for sale | 0 | 0
Securities available for sale | 0 | 0
Corporate Debt Securities [Member] |  |
Securities available for sale | 5,544 | 3,215
Securities available for sale | 5,544 | 3,215
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available for sale | 0 | 0
Securities available for sale | 0 | 0
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available for sale | 5,544 | 3,215
Securities available for sale | 5,544 | 3,215
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available for sale | 0 | 0
Securities available for sale | $ 0 | $ 0

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