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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 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized Cost | $ 1,102,146 | $ 560,828
Gross Unrealized Gains | 11,534 | 14,856
Gross Unrealized Losses | (14,795) | (897)
Securities available for sale | 1,098,885 | 574,787
US Treasury and Government [Member] |  |
Amortized Cost | 2,001 | 2,007
Gross Unrealized Gains | 7 | 44
Gross Unrealized Losses | 0 | 0
Securities available for sale | 2,008 | 2,051
US Treasury Securities [Member] |  |
Amortized Cost | 93,267 | 1,996
Gross Unrealized Gains | 23 | 60
Gross Unrealized Losses | (1,311) | 0
Securities available for sale | 91,979 | 2,056
US States and Political Subdivisions Debt Securities [Member] |  |
Amortized Cost | 528,252 | 307,201
Gross Unrealized Gains | 10,704 | 13,191
Gross Unrealized Losses | (4,109) | (24)
Securities available for sale | 534,847 | 320,368
Collateralized Mortgage Backed Securities [Member] |  |
Amortized Cost | 441,383 | 246,085
Gross Unrealized Gains | 781 | 1,510
Gross Unrealized Losses | (9,049) | (872)
Securities available for sale | 433,115 | 246,723
Corporate Debt Securities [Member] |  |
Amortized Cost | 20,856 | 3,539
Gross Unrealized Gains | 19 | 51
Gross Unrealized Losses | (233) | (1)
Securities available for sale | 20,642 | $ 3,589
Asset-backed Securities [Member] |  |
Amortized Cost | 16,387 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (93) |
Securities available for sale | $ 16,294 |

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