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Note 16 - Fair Value Measurements - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Available for sale securities | $ 736,389 | $ 786,438
US Treasury Securities [Member] |  |
Available for sale securities | 200,088 | 207,597
US Government Agencies Debt Securities [Member] |  |
Available for sale securities | 92,615 | 100,933
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Available for sale securities | 101,864 | 116,741
US States and Political Subdivisions Debt Securities [Member] |  |
Available for sale securities | 269,891 | 286,003
Corporate Debt Securities [Member] |  |
Available for sale securities | 71,931 | 75,164
Fair Value, Recurring [Member] |  |
Loans | 8,327 | 8,494
Interest rate swaps, Fair value |  | 1,096
Fair Value, Recurring [Member] | Other Assets [Member] |  |
Interest rate swaps, Fair value | 1,225 |
Fair Value, Recurring [Member] | Other Liabilities [Member] |  |
Derivative financial instruments | 745 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Loans | 0 | 0
Interest rate swaps, Fair value |  | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other Assets [Member] |  |
Interest rate swaps, Fair value | 0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other Liabilities [Member] |  |
Derivative financial instruments | 0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Loans | 8,327 | 8,494
Interest rate swaps, Fair value |  | 1,096
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other Assets [Member] |  |
Interest rate swaps, Fair value | 1,225 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other Liabilities [Member] |  |
Derivative financial instruments | 745 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Loans | 0 | 0
Interest rate swaps, Fair value |  | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other Assets [Member] |  |
Interest rate swaps, Fair value | 0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other Liabilities [Member] |  |
Derivative financial instruments | 0 |
Fair Value, Recurring [Member] | US Treasury Securities [Member] |  |
Available for sale securities | 200,088 | 207,597
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available for sale securities | 200,088 | 207,597
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available for sale securities | 0 | 0
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available for sale securities | 0 | 0
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] |  |
Available for sale securities | 92,615 | 100,933
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available for sale securities | 0 | 0
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available for sale securities | 92,615 | 100,933
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available for sale securities | 0 | 0
Fair Value, Recurring [Member] | Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Available for sale securities | 101,864 | 116,741
Fair Value, Recurring [Member] | Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available for sale securities | 0 | 0
Fair Value, Recurring [Member] | Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available for sale securities | 101,864 | 116,741
Fair Value, Recurring [Member] | Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available for sale securities | 0 | 0
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Available for sale securities | 269,891 | 286,003
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available for sale securities | 0 | 0
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available for sale securities | 269,891 | 286,003
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available for sale securities | 0 | 0
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |
Available for sale securities | 71,931 | 75,164
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available for sale securities | 0 | 0
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available for sale securities | 71,931 | 75,164
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available for sale securities | $ 0 | $ 0

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