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Note 6 - Debt Securities - Securities Available-for-sale Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Less than 12 months, estimated fair value | $ 139,368 | $ 406,076
Less than 12 months, unrealized losses | (4,240) | (31,483)
12 months or more, estimated fair value | 629,220 | 367,850
12 months or more, unrealized losses | (66,582) | (52,117)
Total estimated fair value | 768,588 | 773,926
Total unrealized losses | (70,822) | (83,600)
US Treasury Securities [Member] |  |
Less than 12 months, estimated fair value | 15,058 | 57,882
Less than 12 months, unrealized losses | (403) | (3,960)
12 months or more, estimated fair value | 190,455 | 147,215
12 months or more, unrealized losses | (16,143) | (15,508)
Total estimated fair value | 205,513 | 205,097
Total unrealized losses | (16,546) | (19,468)
US Government Agencies Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 16,815 | 61,821
Less than 12 months, unrealized losses | (341) | (4,293)
12 months or more, estimated fair value | 85,231 | 38,492
12 months or more, unrealized losses | (7,439) | (5,148)
Total estimated fair value | 102,046 | 100,313
Total unrealized losses | (7,780) | (9,441)
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Less than 12 months, estimated fair value | 9,232 | 45,440
Less than 12 months, unrealized losses | (456) | (4,393)
12 months or more, estimated fair value | 104,381 | 70,854
12 months or more, unrealized losses | (14,361) | (12,075)
Total estimated fair value | 113,613 | 116,294
Total unrealized losses | (14,817) | (16,468)
US States and Political Subdivisions Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 65,599 | 181,640
Less than 12 months, unrealized losses | (1,727) | (14,556)
12 months or more, estimated fair value | 209,541 | 97,907
12 months or more, unrealized losses | (23,860) | (16,647)
Total estimated fair value | 275,140 | 279,547
Total unrealized losses | (25,587) | (31,203)
Corporate Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 32,664 | 59,293
Less than 12 months, unrealized losses | (1,313) | (4,281)
12 months or more, estimated fair value | 39,612 | 13,382
12 months or more, unrealized losses | (4,779) | (2,739)
Total estimated fair value | 72,276 | 72,675
Total unrealized losses | $ (6,092) | $ (7,020)

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