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Note 5 - Fair Value Measurements - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Available for sale securities | $ 783,967 | $ 831,003
US Treasury Securities [Member] |  |
Available for sale securities | 208,086 | 190,479
US Government Agencies Debt Securities [Member] |  |
Available for sale securities | 103,643 | 116,014
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Available for sale securities | 118,357 | 149,601
US States and Political Subdivisions Debt Securities [Member] |  |
Available for sale securities | 280,489 | 292,859
Corporate Debt Securities [Member] |  |
Available for sale securities | 73,392 | 82,050
Fair Value, Recurring [Member] |  |
Fair value hedges, Assets | 1,165 |
Derivative financial instruments |  | 527
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair value hedges, Assets | 0 |
Derivative financial instruments |  | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair value hedges, Assets | 1,165 |
Derivative financial instruments |  | 527
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair value hedges, Assets | 0 |
Derivative financial instruments |  | 0
Fair Value, Recurring [Member] | US Treasury Securities [Member] |  |
Available for sale securities | 208,086 | 190,479
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available for sale securities | 208,086 | 190,479
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 | 103,643 | 116,014
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 | 103,643 | 116,014
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 | 118,357 | 149,601
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 | 118,357 | 149,601
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 | 280,489 | 292,859
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 | 280,489 | 292,859
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 | 73,392 | 82,050
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 | 73,392 | 82,050
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available for sale securities | $ 0 | $ 0

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