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Note 6 - Debt Securities - Securities Available-for-sale Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Less than 12 months, estimated fair value | $ 73,065 | $ 406,076
Less than 12 months, unrealized losses | (2,058) | (31,483)
12 months or more, estimated fair value | 675,635 | 367,850
12 months or more, unrealized losses | (73,627) | (52,117)
Total estimated fair value | 748,700 | 773,926
Total unrealized losses | (75,685) | (83,600)
US Treasury Securities [Member] |  |
Less than 12 months, estimated fair value | 3,901 | 57,882
Less than 12 months, unrealized losses | (56) | (3,960)
12 months or more, estimated fair value | 200,255 | 147,215
12 months or more, unrealized losses | (17,835) | (15,508)
Total estimated fair value | 204,156 | 205,097
Total unrealized losses | (17,891) | (19,468)
US Government Agencies Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 6,830 | 61,821
Less than 12 months, unrealized losses | (186) | (4,293)
12 months or more, estimated fair value | 93,144 | 38,492
12 months or more, unrealized losses | (8,583) | (5,148)
Total estimated fair value | 99,974 | 100,313
Total unrealized losses | (8,769) | (9,441)
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Less than 12 months, estimated fair value | 2,212 | 45,440
Less than 12 months, unrealized losses | (79) | (4,393)
12 months or more, estimated fair value | 106,525 | 70,854
12 months or more, unrealized losses | (15,351) | (12,075)
Total estimated fair value | 108,737 | 116,294
Total unrealized losses | (15,430) | (16,468)
US States and Political Subdivisions Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 49,104 | 181,640
Less than 12 months, unrealized losses | (1,366) | (14,556)
12 months or more, estimated fair value | 216,949 | 97,907
12 months or more, unrealized losses | (25,794) | (16,647)
Total estimated fair value | 266,053 | 279,547
Total unrealized losses | (27,160) | (31,203)
Corporate Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 11,018 | 59,293
Less than 12 months, unrealized losses | (371) | (4,281)
12 months or more, estimated fair value | 58,762 | 13,382
12 months or more, unrealized losses | (6,064) | (2,739)
Total estimated fair value | 69,780 | 72,675
Total unrealized losses | $ (6,435) | $ (7,020)

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