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Note 2 - Investment Securities - Securities With Unrealized Losses (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Securities available-for-sale, less than 12 months, fair value | $ 27,496 | $ 22,672
Securities HTM, less than 12 months, fair value | 202 | 455
Securities available-for-sale, less than 12 months, unrealized losses | (529) | (159)
Securities HTM, less than 12 months, unrealized losses | 0 | (1)
Securities available-for-sale, 12 months or more, fair value | 924,184 | 969,852
Securities HTM, 12 months or more, fair value | 347,254 | 407,798
Securities available-for-sale, 12 months or more, unrealized losses | (129,339) | (123,060)
Securities HTM, 12 months or more, unrealized losses | (32,840) | (31,318)
Securities available-for-sale, fair value | 951,680 | 992,524
Securities HTM, fair value | 347,456 | 408,253
Securities available-for-sale, unrealized losses | (129,868) | (123,219)
Securities HTM, unrealized losses | (32,840) | (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 | 118,875 | 116,269
Securities HTM, 12 months or more, fair value | 150,183 | 198,327
Securities available-for-sale, 12 months or more, unrealized losses | (1,104) | (3,662)
Securities HTM, 12 months or more, unrealized losses | (3,353) | (4,932)
Securities available-for-sale, fair value | 118,875 | 116,269
Securities HTM, fair value | 150,183 | 198,327
Securities available-for-sale, unrealized losses | (1,104) | (3,662)
Securities HTM, unrealized losses | (3,353) | (4,932)
US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities available-for-sale, less than 12 months, fair value | 4,740 | 0
Securities HTM, less than 12 months, fair value | 0 | 455
Securities available-for-sale, less than 12 months, unrealized losses | (3) | 0
Securities HTM, less than 12 months, unrealized losses | 0 | (1)
Securities available-for-sale, 12 months or more, fair value | 78,008 | 83,675
Securities HTM, 12 months or more, fair value | 23,644 | 23,967
Securities available-for-sale, 12 months or more, unrealized losses | (5,156) | (4,987)
Securities HTM, 12 months or more, unrealized losses | (2,637) | (2,456)
Securities available-for-sale, fair value | 82,748 | 83,675
Securities HTM, fair value | 23,644 | 24,422
Securities available-for-sale, unrealized losses | (5,159) | (4,987)
Securities HTM, unrealized losses | (2,637) | (2,457)
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] |  |
Securities available-for-sale, less than 12 months, fair value | 11,317 | 16,346
Securities HTM, less than 12 months, fair value | 202 | 0
Securities available-for-sale, less than 12 months, unrealized losses | (155) | (95)
Securities HTM, less than 12 months, unrealized losses | 0 | 0
Securities available-for-sale, 12 months or more, fair value | 620,763 | 661,195
Securities HTM, 12 months or more, fair value | 173,427 | 185,504
Securities available-for-sale, 12 months or more, unrealized losses | (108,218) | (101,094)
Securities HTM, 12 months or more, unrealized losses | (26,850) | (23,930)
Securities available-for-sale, fair value | 632,080 | 677,541
Securities HTM, fair value | 173,629 | 185,504
Securities available-for-sale, unrealized losses | (108,373) | (101,189)
Securities HTM, unrealized losses | (26,850) | (23,930)
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available-for-sale, less than 12 months, fair value | 11,439 | 6,326
Securities available-for-sale, less than 12 months, unrealized losses | (371) | (64)
Securities available-for-sale, 12 months or more, fair value | 103,010 | 105,179
Securities available-for-sale, 12 months or more, unrealized losses | (14,638) | (13,030)
Securities available-for-sale, fair value | 114,449 | 111,505
Securities available-for-sale, unrealized losses | (15,009) | (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 | 3,528 | 3,534
Securities available-for-sale, 12 months or more, unrealized losses | (223) | (287)
Securities available-for-sale, fair value | 3,528 | 3,534
Securities available-for-sale, unrealized losses | $ (223) | $ (287)

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