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Note 2 - Securities - Fair Value of Debt Security, Available-for-sale and Held-to-maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Amortized Cost, available for sale | $ 683,843 | $ 1,102,146
Gross Unrealized Gains, available for sale | 474 | 11,534
Gross Unrealized Losses, available for sale | (43,269) | (14,795)
Fair Value, available for sale | 641,048 | 1,098,885
Amortized Cost, held to maturity | 429,918 |
Gross Unrealized Gains, held to maturity | 32 |
Gross Unrealized Losses, held to maturity | (32,039) |
Fair Value, held to maturity | 397,911 |
US Treasury and Government [Member] |  |
Amortized Cost, available for sale | 0 | 2,001
Gross Unrealized Gains, available for sale | 0 | 7
Gross Unrealized Losses, available for sale | 0 | 0
Fair Value, available for sale | 0 | 2,008
Amortized Cost, held to maturity | 2,962 |
Gross Unrealized Gains, held to maturity | 0 |
Gross Unrealized Losses, held to maturity | (195) |
Fair Value, held to maturity | 2,767 |
US Treasury Securities [Member] |  |
Amortized Cost, available for sale | 93,154 | 93,267
Gross Unrealized Gains, available for sale | 8 | 23
Gross Unrealized Losses, available for sale | (6,671) | (1,311)
Fair Value, available for sale | 86,491 | 91,979
Amortized Cost, held to maturity | 0 |
Gross Unrealized Gains, held to maturity | 0 |
Gross Unrealized Losses, held to maturity | 0 |
Fair Value, held to maturity | 0 |
US States and Political Subdivisions Debt Securities [Member] |  |
Amortized Cost, available for sale | 334,907 | 528,252
Gross Unrealized Gains, available for sale | 443 | 10,704
Gross Unrealized Losses, available for sale | (22,962) | (4,109)
Fair Value, available for sale | 312,388 | 534,847
Amortized Cost, held to maturity | 204,201 |
Gross Unrealized Gains, held to maturity | 2 |
Gross Unrealized Losses, held to maturity | (17,668) |
Fair Value, held to maturity | 186,535 |
Collateralized Mortgage-Backed Securities [Member] |  |
Amortized Cost, available for sale | 240,062 | 441,383
Gross Unrealized Gains, available for sale | 19 | 781
Gross Unrealized Losses, available for sale | (13,412) | (9,049)
Fair Value, available for sale | 226,669 | 433,115
Amortized Cost, held to maturity | 204,165 |
Gross Unrealized Gains, held to maturity | 30 |
Gross Unrealized Losses, held to maturity | (13,533) |
Fair Value, held to maturity | 190,662 |
Corporate Debt Securities [Member] |  |
Amortized Cost, available for sale | 1,255 | 20,856
Gross Unrealized Gains, available for sale | 4 | 19
Gross Unrealized Losses, available for sale | (4) | (233)
Fair Value, available for sale | 1,255 | 20,642
Amortized Cost, held to maturity | 17,161 |
Gross Unrealized Gains, held to maturity | 0 |
Gross Unrealized Losses, held to maturity | (606) |
Fair Value, held to maturity | 16,555 |
Asset-Backed Securities [Member] |  |
Amortized Cost, available for sale | 14,465 | 16,387
Gross Unrealized Gains, available for sale | 0 | 0
Gross Unrealized Losses, available for sale | (220) | (93)
Fair Value, available for sale | 14,245 | $ 16,294
Amortized Cost, held to maturity | 1,429 |
Gross Unrealized Gains, held to maturity | 0 |
Gross Unrealized Losses, held to maturity | (37) |
Fair Value, held to maturity | $ 1,392 |

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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