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Note 5 - Fair Value Measurements - Assets and Liabilities at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Securities available for sale | $ 614,178 | $ 656,852
Securities available for sale | 614,178 | 656,852
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 | 614,178 | 656,852
Securities available for sale | 614,178 | 656,852
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 | 940 | 936
Securities available for sale | 940 | 936
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available for sale | 0 | 0
Securities available for sale | 0 | 0
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available for sale | 940 | 936
Securities available for sale | 940 | 936
US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available for sale | 0 | 0
Securities available for sale | 0 | 0
US Government Agencies Debt Securities [Member] |  |
Securities available for sale | 304,901 | 336,575
Securities available for sale | 304,901 | 336,575
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 | 304,901 | 336,575
Securities available for sale | 304,901 | 336,575
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 | 147,146 | 152,200
Securities available for sale | 147,146 | 152,200
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 | 147,146 | 152,200
Securities available for sale | 147,146 | 152,200
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 | 155,588 | 161,477
Securities available for sale | 155,588 | 161,477
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 | 155,588 | 161,477
Securities available for sale | 155,588 | 161,477
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 | 5,603 | 5,664
Securities available for sale | 5,603 | 5,664
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 | 5,603 | 5,664
Securities available for sale | 5,603 | 5,664
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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