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Note 2 - Investment Securities - Securities With Unrealized Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Securities available-for-sale, less than 12 months, fair value | $ 13,667 | $ 22,672
Securities HTM, less than 12 months, fair value | 402 | 455
Securities available-for-sale, less than 12 months, unrealized losses | (85) | (159)
Securities HTM, less than 12 months, unrealized losses | (4) | (1)
Securities available-for-sale, 12 months or more, fair value | 808,725 | 969,852
Securities HTM, 12 months or more, fair value | 351,799 | 407,798
Securities available-for-sale, 12 months or more, unrealized losses | (97,074) | (123,060)
Securities HTM, 12 months or more, unrealized losses | (22,481) | (31,318)
Securities available-for-sale, fair value | 822,392 | 992,524
Securities HTM, fair value | 352,201 | 408,253
Securities available-for-sale, unrealized losses | (97,159) | (123,219)
Securities HTM, unrealized losses | (22,485) | (31,319)
US Treasury Securities and US Government Agencies Debt Securities [Member] |  |
Securities available-for-sale, less than 12 months, fair value | 0 | 0
Securities HTM, less than 12 months, fair value | 0 | 0
Securities available-for-sale, less than 12 months, unrealized losses | 0 | 0
Securities HTM, less than 12 months, unrealized losses | 0 | 0
Securities available-for-sale, 12 months or more, fair value | 19,966 | 116,269
Securities HTM, 12 months or more, fair value | 152,153 | 198,327
Securities available-for-sale, 12 months or more, unrealized losses | (33) | (3,662)
Securities HTM, 12 months or more, unrealized losses | (1,539) | (4,932)
Securities available-for-sale, fair value | 19,966 | 116,269
Securities HTM, fair value | 152,153 | 198,327
Securities available-for-sale, unrealized losses | (33) | (3,662)
Securities HTM, unrealized losses | (1,539) | (4,932)
US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities available-for-sale, less than 12 months, fair value | 5,916 | 0
Securities HTM, less than 12 months, fair value | 402 | 455
Securities available-for-sale, less than 12 months, unrealized losses | (16) | 0
Securities HTM, less than 12 months, unrealized losses | (4) | (1)
Securities available-for-sale, 12 months or more, fair value | 77,159 | 83,675
Securities HTM, 12 months or more, fair value | 23,825 | 23,967
Securities available-for-sale, 12 months or more, unrealized losses | (3,511) | (4,987)
Securities HTM, 12 months or more, unrealized losses | (1,474) | (2,456)
Securities available-for-sale, fair value | 83,075 | 83,675
Securities HTM, fair value | 24,227 | 24,422
Securities available-for-sale, unrealized losses | (3,527) | (4,987)
Securities HTM, unrealized losses | (1,478) | (2,457)
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] |  |
Securities available-for-sale, less than 12 months, fair value | 0 | 16,346
Securities HTM, less than 12 months, fair value | 0 | 0
Securities available-for-sale, less than 12 months, unrealized losses | 0 | (95)
Securities HTM, less than 12 months, unrealized losses | 0 | 0
Securities available-for-sale, 12 months or more, fair value | 607,428 | 661,195
Securities HTM, 12 months or more, fair value | 175,821 | 185,504
Securities available-for-sale, 12 months or more, unrealized losses | (82,543) | (101,094)
Securities HTM, 12 months or more, unrealized losses | (19,468) | (23,930)
Securities available-for-sale, fair value | 607,428 | 677,541
Securities HTM, fair value | 175,821 | 185,504
Securities available-for-sale, unrealized losses | (82,543) | (101,189)
Securities HTM, unrealized losses | (19,468) | (23,930)
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available-for-sale, less than 12 months, fair value | 7,751 | 6,326
Securities available-for-sale, less than 12 months, unrealized losses | (69) | (64)
Securities available-for-sale, 12 months or more, fair value | 100,646 | 105,179
Securities available-for-sale, 12 months or more, unrealized losses | (10,794) | (13,030)
Securities available-for-sale, fair value | 108,397 | 111,505
Securities available-for-sale, unrealized losses | (10,863) | (13,094)
Other Debt Obligations [Member] |  |
Securities available-for-sale, less than 12 months, fair value | 0 | 0
Securities available-for-sale, less than 12 months, unrealized losses | 0 | 0
Securities available-for-sale, 12 months or more, fair value | 3,526 | 3,534
Securities available-for-sale, 12 months or more, unrealized losses | (193) | (287)
Securities available-for-sale, fair value | 3,526 | 3,534
Securities available-for-sale, unrealized losses | $ (193) | $ (287)

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