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Note 2 - Securities - Fair Value of Securities Available for Sale and The Related Unrealized Gains and Losses Recognized in Accumulated Comprehensive Income (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Amortized Cost, available for sale | $ 640,084 | $ 1,102,146
Gross Unrealized Gains, available for sale | 39 | 11,534
Gross Unrealized Losses, available for sale | (73,981) | (14,795)
Fair Value, available for sale | 566,142 | 1,098,885
US Treasury and Government [Member] |  |
Amortized Cost, available for sale | 2,963 | 2,001
Gross Unrealized Gains, available for sale | 0 | 7
Gross Unrealized Losses, available for sale | (283) | 0
Fair Value, available for sale | 2,680 | 2,008
US Treasury Securities [Member] |  |
Amortized Cost, available for sale | 93,040 | 93,267
Gross Unrealized Gains, available for sale | 0 | 23
Gross Unrealized Losses, available for sale | (9,397) | (1,311)
Fair Value, available for sale | 83,643 | 91,979
US States and Political Subdivisions Debt Securities [Member] |  |
Amortized Cost, available for sale | 300,824 | 528,252
Gross Unrealized Gains, available for sale | 34 | 10,704
Gross Unrealized Losses, available for sale | (44,197) | (4,109)
Fair Value, available for sale | 256,661 | 534,847
Collateralized Mortgage-Backed Securities [Member] |  |
Amortized Cost, available for sale | 230,842 | 441,383
Gross Unrealized Gains, available for sale | 5 | 781
Gross Unrealized Losses, available for sale | (19,719) | (9,049)
Fair Value, available for sale | 211,128 | 433,115
Corporate Debt Securities [Member] |  |
Amortized Cost, available for sale | 1,256 | 20,856
Gross Unrealized Gains, available for sale | 0 | 19
Gross Unrealized Losses, available for sale | (18) | (233)
Fair Value, available for sale | 1,238 | 20,642
Asset-Backed Securities [Member] |  |
Amortized Cost, available for sale | 14,122 | 16,387
Gross Unrealized Gains, available for sale | 0 | 0
Gross Unrealized Losses, available for sale | (650) | (93)
Fair Value, available for sale | $ 13,472 | $ 16,294

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