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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, 2022 | Dec. 31, 2021
--- | --- | ---
Debt securities, amortized cost | $ 618,790 | $ 1,102,146
Gross Unrealized Gains | 0 | 11,534
Gross Unrealized Losses | (89,041) | (14,795)
Debt securities, fair value | 529,749 | 1,098,885
US Treasury and Government [Member] |  |
Debt securities, amortized cost | 0 | 2,001
Gross Unrealized Gains | 0 | 7
Gross Unrealized Losses | 0 | 0
Debt securities, fair value | 0 | 2,008
US Treasury Securities [Member] |  |
Debt securities, amortized cost | 90,810 | 93,267
Gross Unrealized Gains | 0 | 23
Gross Unrealized Losses | (12,606) | (1,311)
Debt securities, fair value | 78,204 | 91,979
US States and Political Subdivisions Debt Securities [Member] |  |
Debt securities, amortized cost | 277,489 | 528,252
Gross Unrealized Gains | 0 | 10,704
Gross Unrealized Losses | (47,551) | (4,109)
Debt securities, fair value | 229,938 | 534,847
Collateralized Mortgage-Backed Securities [Member] |  |
Debt securities, amortized cost | 236,703 | 441,383
Gross Unrealized Gains | 0 | 781
Gross Unrealized Losses | (28,140) | (9,049)
Debt securities, fair value | 208,563 | 433,115
Corporate Debt Securities [Member] |  |
Debt securities, amortized cost | 757 | 20,856
Gross Unrealized Gains | 0 | 19
Gross Unrealized Losses | (46) | (233)
Debt securities, fair value | 711 | 20,642
Asset-Backed Securities [Member] |  |
Debt securities, amortized cost | 13,031 | 16,387
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (698) | (93)
Debt securities, fair value | $ 12,333 | $ 16,294

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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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