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Note 6 - Debt Securities - Securities Available-for-sale Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Less than 12 months, estimated fair value | $ 23,819 | $ 406,076
Less than 12 months, unrealized losses | (937) | (31,483)
12 months or more, estimated fair value | 710,255 | 367,850
12 months or more, unrealized losses | (86,897) | (52,117)
Total estimated fair value | 734,074 | 773,926
Total unrealized losses | (87,834) | (83,600)
US Treasury Securities [Member] |  |
Less than 12 months, estimated fair value | 0 | 57,882
Less than 12 months, unrealized losses | 0 | (3,960)
12 months or more, estimated fair value | 202,522 | 147,215
12 months or more, unrealized losses | (18,510) | (15,508)
Total estimated fair value | 202,522 | 205,097
Total unrealized losses | (18,510) | (19,468)
US Government Agencies Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 1,934 | 61,821
Less than 12 months, unrealized losses | (64) | (4,293)
12 months or more, estimated fair value | 95,544 | 38,492
12 months or more, unrealized losses | (9,486) | (5,148)
Total estimated fair value | 97,478 | 100,313
Total unrealized losses | (9,550) | (9,441)
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Less than 12 months, estimated fair value | 816 | 45,440
Less than 12 months, unrealized losses | (34) | (4,393)
12 months or more, estimated fair value | 100,453 | 70,854
12 months or more, unrealized losses | (18,416) | (12,075)
Total estimated fair value | 101,269 | 116,294
Total unrealized losses | (18,450) | (16,468)
US States and Political Subdivisions Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 17,036 | 181,640
Less than 12 months, unrealized losses | (662) | (14,556)
12 months or more, estimated fair value | 246,247 | 97,907
12 months or more, unrealized losses | (33,007) | (16,647)
Total estimated fair value | 263,283 | 279,547
Total unrealized losses | (33,669) | (31,203)
Corporate Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 4,033 | 59,293
Less than 12 months, unrealized losses | (177) | (4,281)
12 months or more, estimated fair value | 65,489 | 13,382
12 months or more, unrealized losses | (7,478) | (2,739)
Total estimated fair value | 69,522 | 72,675
Total unrealized losses | $ (7,655) | $ (7,020)

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