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Note 4 - Investment Securities - Continuous Unrealized Loss Position (Details) $ in Thousands | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
--- | --- | ---
Unrealized loss position, fair value, less than 12 months | $ 1,611 | $ 781
Unrealized loss position, unrealized losses, less than 12 months | (35) | (22)
Unrealized loss position, fair value, more than 12 months | 526,766 | 539,288
Unrealized loss position, unrealized losses, more than 12 months | (83,967) | (76,470)
Unrealized loss position, fair value | 528,377 | 540,069
Unrealized loss position, unrealized losses | $ (84,002) | $ (76,492)
Number of securities, less than 12 months | 3 | 2
Number of securities, more than 12 months | 415 | 414
Number of securities | 418 | 416
US Government Agencies Debt Securities [Member] |  |
Unrealized loss position, fair value, less than 12 months | $ 0 | $ 0
Unrealized loss position, unrealized losses, less than 12 months | 0 | 0
Unrealized loss position, fair value, more than 12 months | 100,405 | 101,366
Unrealized loss position, unrealized losses, more than 12 months | (12,452) | (11,194)
Unrealized loss position, fair value | 100,405 | 101,366
Unrealized loss position, unrealized losses | $ (12,452) | (11,194)
Number of securities | 46 |
US States and Political Subdivisions Debt Securities [Member] |  |
Unrealized loss position, fair value, less than 12 months | $ 1,611 | 781
Unrealized loss position, unrealized losses, less than 12 months | (35) | (22)
Unrealized loss position, fair value, more than 12 months | 240,460 | 244,224
Unrealized loss position, unrealized losses, more than 12 months | (37,551) | (33,814)
Unrealized loss position, fair value | 242,071 | 245,005
Unrealized loss position, unrealized losses | $ (37,586) | (33,836)
Number of securities | 237 |
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] |  |
Unrealized loss position, fair value, less than 12 months | $ 0 | 0
Unrealized loss position, unrealized losses, less than 12 months | 0 | 0
Unrealized loss position, fair value, more than 12 months | 185,901 | 193,698
Unrealized loss position, unrealized losses, more than 12 months | (33,964) | (31,462)
Unrealized loss position, fair value | 185,901 | 193,698
Unrealized loss position, unrealized losses | $ (33,964) | $ (31,462)
Number of securities | 135 |

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