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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, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized Cost | $ 846,889 | $ 560,828
Gross Unrealized Gains | 14,484 | 14,856
Gross Unrealized Losses | (5,818) | (897)
Fair Value | 855,555 | 574,787
US Treasury and Government [Member] |  |
Amortized Cost | 2,004 | 2,007
Gross Unrealized Gains | 26 | 44
Gross Unrealized Losses | 0 | 0
Fair Value | 2,030 | 2,051
US Treasury Securities [Member] |  |
Amortized Cost | 37,195 | 1,996
Gross Unrealized Gains | 166 | 60
Gross Unrealized Losses | 0 | 0
Fair Value | 37,361 | 2,056
US States and Political Subdivisions Debt Securities [Member] |  |
Amortized Cost | 476,698 | 307,201
Gross Unrealized Gains | 12,657 | 13,191
Gross Unrealized Losses | (1,914) | (24)
Fair Value | 487,441 | 320,368
Collateralized Mortgage Backed Securities [Member] |  |
Amortized Cost | 320,612 | 246,085
Gross Unrealized Gains | 1,596 | 1,510
Gross Unrealized Losses | (3,895) | (872)
Fair Value | 318,313 | 246,723
Corporate Debt Securities [Member] |  |
Amortized Cost | 8,303 | 3,539
Gross Unrealized Gains | 39 | 51
Gross Unrealized Losses | 0 | (1)
Fair Value | 8,342 | 3,589
Asset-backed Securities [Member] |  |
Amortized Cost | 2,077 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (9) |
Fair Value | $ 2,068 | $ 0

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