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Note 3 - Investment Securities - Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-Sale, Amortized Cost | $ 432,405 | $ 468,549
Securities available for sale, gross unrealized gains | 974 | 787
Securities available for sale, gross unrealized losses | 24,910 | 32,065
Securities available for sale, at fair value | 408,469 | 437,271
Securities held to maturity, amortized cost | 7,000 | 7,000
Securities held to maturity, gross unrealized gains | 0 | 0
Securities held to maturity, gross unrealized losses | 2,312 | 2,554
Debt Securities, Held-to-Maturity, Fair Value | 4,688 | 4,446
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] |  |
Debt Securities, Available-for-Sale, Amortized Cost | 72,785 | 81,166
Securities available for sale, gross unrealized gains | 42 | 0
Securities available for sale, gross unrealized losses | 6,315 | 9,122
Securities available for sale, at fair value | 66,512 | 72,044
Agency Collateralized Mortgage Obligations [Member] |  |
Debt Securities, Available-for-Sale, Amortized Cost | 52,335 | 25,402
Securities available for sale, gross unrealized gains | 199 | 94
Securities available for sale, gross unrealized losses | 222 | 323
Securities available for sale, at fair value | 52,312 | 25,173
US Government Agencies Debt Securities [Member] |  |
Debt Securities, Available-for-Sale, Amortized Cost | 126,601 | 138,174
Securities available for sale, gross unrealized gains | 135 | 38
Securities available for sale, gross unrealized losses | 4,901 | 8,707
Securities available for sale, at fair value | 121,835 | 129,505
US Treasury and Government [Member] |  |
Debt Securities, Available-for-Sale, Amortized Cost | 34,781 | 64,758
Securities available for sale, gross unrealized gains | 0 | 0
Securities available for sale, gross unrealized losses | 398 | 1,674
Securities available for sale, at fair value | 34,383 | 63,084
Municipal Notes [Member] |  |
Debt Securities, Available-for-Sale, Amortized Cost | 145,903 | 159,049
Securities available for sale, gross unrealized gains | 598 | 655
Securities available for sale, gross unrealized losses | 13,074 | 12,239
Securities available for sale, at fair value | 133,427 | 147,465
Corporate Note Securities [Member] |  |
Securities held to maturity, amortized cost | 7,000 | 7,000
Securities held to maturity, gross unrealized gains | 0 | 0
Securities held to maturity, gross unrealized losses | 2,312 | 2,554
Debt Securities, Held-to-Maturity, Fair Value | $ 4,688 | $ 4,446

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