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Note 18 - Fair Value Measurements - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Equity securities at fair value (Note 2) | $ 8,492 | $ 2,896
Securities available for sale (Note 2) | 1,098,885 | 574,787
US Treasury and Government [Member] |  |
Securities available for sale (Note 2) | 2,008 | 2,051
US Treasury Securities [Member] |  |
Securities available for sale (Note 2) | 91,979 | 2,056
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available for sale (Note 2) | 534,847 | 320,368
Collateralized Mortgage Backed Securities [Member] |  |
Securities available for sale (Note 2) | 433,115 | 246,723
Corporate Debt Securities [Member] |  |
Securities available for sale (Note 2) | 20,642 | 3,589
Asset-backed Securities [Member] |  |
Securities available for sale (Note 2) | 16,294 |
Fair Value, Recurring [Member] |  |
Securities available for sale (Note 2) | 1,098,885 | 574,787
Fair Value, Recurring [Member] | Equity Securities [Member] |  |
Equity securities at fair value (Note 2) | 8,492 | 2,896
Fair Value, Recurring [Member] | US Treasury and Government [Member] |  |
Securities available for sale (Note 2) | 2,008 | 2,051
Fair Value, Recurring [Member] | US Treasury Securities [Member] |  |
Securities available for sale (Note 2) | 91,979 | 2,056
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Securities available for sale (Note 2) | 534,847 | 320,368
Fair Value, Recurring [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Securities available for sale (Note 2) | 433,115 | 246,723
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |
Securities available for sale (Note 2) | 20,642 | 3,589
Fair Value, Recurring [Member] | Asset-backed Securities [Member] |  |
Securities available for sale (Note 2) | 16,294 |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |
Securities available for sale (Note 2) | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Equity Securities [Member] |  |
Equity securities at fair value (Note 2) | 6,724 | 1,411
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US Treasury and Government [Member] |  |
Securities available for sale (Note 2) | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US Treasury Securities [Member] |  |
Securities available for sale (Note 2) | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Securities available for sale (Note 2) | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Securities available for sale (Note 2) | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |
Securities available for sale (Note 2) | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Asset-backed Securities [Member] |  |
Securities available for sale (Note 2) | 0 |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |
Securities available for sale (Note 2) | 1,077,835 | 563,364
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Equity Securities [Member] |  |
Equity securities at fair value (Note 2) | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Treasury and Government [Member] |  |
Securities available for sale (Note 2) | 2,008 | 2,051
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Treasury Securities [Member] |  |
Securities available for sale (Note 2) | 91,979 | 2,056
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Securities available for sale (Note 2) | 514,797 | 309,945
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Securities available for sale (Note 2) | 433,115 | 246,723
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |
Securities available for sale (Note 2) | 19,642 | 2,589
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Asset-backed Securities [Member] |  |
Securities available for sale (Note 2) | 16,294 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |
Securities available for sale (Note 2) | 21,050 | 11,423
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Equity Securities [Member] |  |
Equity securities at fair value (Note 2) | 1,768 | 1,485
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | US Treasury and Government [Member] |  |
Securities available for sale (Note 2) | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | US Treasury Securities [Member] |  |
Securities available for sale (Note 2) | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Securities available for sale (Note 2) | 20,050 | 10,423
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Securities available for sale (Note 2) | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |
Securities available for sale (Note 2) | 1,000 | $ 1,000
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Asset-backed Securities [Member] |  |
Securities available for sale (Note 2) | $ 0 |

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