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Note 3 - Investment Securities - Investment Securities Continuous Unrealized Loss Position (Details) $ in Thousands | Sep. 30, 2024 USD ($) | Dec. 31, 2023 USD ($)
--- | --- | ---
Number of investment positions - less than twelve months, available for sale | 16 | 80
Fair value - less than twelve months, available for sale | $ 18,814 | $ 42,897
Gross unrealized losses - less than twelve months, available for sale | $ 191 | $ 2,447
Number of investment positions - more than twelve months, available for sale | 362 | 321
Fair value - more than twelve months, available for sale | $ 324,179 | $ 343,185
Gross unrealized losses - more than twelve months, available for sale | $ 24,719 | $ 29,618
Number of investment positions - available for sale | 378 | 401
Fair value - available for sale | $ 342,993 | $ 386,082
Gross unrealized losses - available for sale | $ 24,910 | $ 32,065
Number of investment positions - more than twelve months, held to maturity | 4 | 4
Fair value - more than twelve months, held to maturity | $ 4,688 | $ 4,446
Gross unrealized losses - more than twelve months, held to maturity | $ 2,312 | $ 2,554
Number of investment positions - held to maturity | 4 | 4
Fair value - held to maturity | $ 4,688 | $ 4,446
Gross unrealized losses - held to maturity | $ 2,312 | $ 2,554
Agency Collateralized Mortgage Obligations [Member] |  |
Number of investment positions - less than twelve months, available for sale | 3 | 3
Fair value - less than twelve months, available for sale | $ 11,844 | $ 8,019
Gross unrealized losses - less than twelve months, available for sale | $ 38 | $ 30
Number of investment positions - more than twelve months, available for sale | 22 | 22
Fair value - more than twelve months, available for sale | $ 8,315 | $ 4,998
Gross unrealized losses - more than twelve months, available for sale | $ 184 | $ 293
US Government Agencies Debt Securities [Member] |  |
Number of investment positions - less than twelve months, available for sale |  | 3
Fair value - less than twelve months, available for sale |  | $ 2,754
Gross unrealized losses - less than twelve months, available for sale |  | $ 12
Number of investment positions - more than twelve months, available for sale | 47 | 52
Fair value - more than twelve months, available for sale | $ 115,349 | $ 123,416
Gross unrealized losses - more than twelve months, available for sale | $ 4,901 | $ 8,695
US States and Political Subdivisions Debt Securities [Member] |  |
Number of investment positions - less than twelve months, available for sale | 13 | 74
Fair value - less than twelve months, available for sale | $ 6,970 | $ 32,124
Gross unrealized losses - less than twelve months, available for sale | $ 153 | $ 2,405
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] |  |
Number of investment positions - more than twelve months, available for sale | 94 | 96
Fair value - more than twelve months, available for sale | $ 65,069 | $ 72,044
Gross unrealized losses - more than twelve months, available for sale | $ 6,315 | $ 9,122
US Treasury and Government [Member] |  |
Number of investment positions - more than twelve months, available for sale | 13 | 21
Fair value - more than twelve months, available for sale | $ 34,383 | $ 63,084
Gross unrealized losses - more than twelve months, available for sale | $ 398 | $ 1,674
Municipal Notes [Member] |  |
Number of investment positions - more than twelve months, available for sale | 186 | 130
Fair value - more than twelve months, available for sale | $ 101,063 | $ 79,643
Gross unrealized losses - more than twelve months, available for sale | $ 12,921 | $ 9,834
Corporate Note Securities [Member] |  |
Number of investment positions - more than twelve months, held to maturity | 4 | 4
Fair value - more than twelve months, held to maturity | $ 4,688 | $ 4,446
Gross unrealized losses - more than twelve months, held to maturity | $ 2,312 | $ 2,554

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