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Note 6 - Fair Value Measurements - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Equity securities, at fair value (Note 2) | $ 8,288 | $ 8,492
Securities available for sale, at fair value (Note 2) | 566,142 | 1,098,885
US Treasury Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 83,643 | 91,979
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 256,661 | 534,847
Collateralized Mortgage-Backed Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 211,128 | 433,115
Corporate Debt Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 1,238 | 20,642
Asset-Backed Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 13,472 | 16,294
US Treasury and Government [Member] |  |
Securities available for sale, at fair value (Note 2) | 2,680 | 2,008
Fair Value, Recurring [Member] |  |
Securities available for sale, at fair value (Note 2) | 566,142 | 1,098,885
Fair Value, Recurring [Member] | Interest Rate Contract [Member] |  |
Interest rate contracts | 14,209 |
Interest rate derivative contracts - liabilities | 2,393 |
Fair Value, Recurring [Member] | Equity Securities [Member] |  |
Equity securities, at fair value (Note 2) | 8,288 | 8,492
Fair Value, Recurring [Member] | US Treasury Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 83,643 | 91,979
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 256,661 | 534,847
Fair Value, Recurring [Member] | Collateralized Mortgage-Backed Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 211,128 | 433,115
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 1,238 | 20,642
Fair Value, Recurring [Member] | Asset-Backed Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 13,472 | 16,294
Fair Value, Recurring [Member] | US Treasury and Government [Member] |  |
Securities available for sale, at fair value (Note 2) | 2,008 |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |
Securities available for sale, at fair value (Note 2) | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Interest Rate Contract [Member] |  |
Interest rate contracts | 0 |
Interest rate derivative contracts - liabilities | 0 |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Equity Securities [Member] |  |
Equity securities, at fair value (Note 2) | 6,462 | 6,724
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US Treasury Securities [Member] |  |
Securities available for sale, at fair value (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, at fair value (Note 2) | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Collateralized Mortgage-Backed Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Asset-Backed Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US Treasury and Government [Member] |  |
Securities available for sale, at fair value (Note 2) | 0 |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |
Securities available for sale, at fair value (Note 2) | 566,142 | 1,077,835
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Interest Rate Contract [Member] |  |
Interest rate contracts | 14,209 |
Interest rate derivative contracts - liabilities | 2,393 |
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 Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 83,643 | 91,979
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 256,661 | 514,797
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Collateralized Mortgage-Backed Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 211,128 | 433,115
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 1,238 | 19,642
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Asset-Backed Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 13,472 | 16,294
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Treasury and Government [Member] |  |
Securities available for sale, at fair value (Note 2) | 2,008 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |
Securities available for sale, at fair value (Note 2) | 0 | 21,050
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Interest Rate Contract [Member] |  |
Interest rate contracts | 0 |
Interest rate derivative contracts - liabilities | 0 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Equity Securities [Member] |  |
Equity securities, at fair value (Note 2) | 1,826 | 1,768
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | US Treasury Securities [Member] |  |
Securities available for sale, at fair value (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, at fair value (Note 2) | 0 | 20,050
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Collateralized Mortgage-Backed Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 0 | 1,000
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Asset-Backed Securities [Member] |  |
Securities available for sale, at fair value (Note 2) | 0 | $ 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | US Treasury and Government [Member] |  |
Securities available for sale, at fair value (Note 2) | $ 0 |

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