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Note 2 - Investment Securities - Available-for-sale Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-Sale, Amortized Cost | $ 958,606 | $ 1,154,153
Securities available-for-sale, unrealized gains | 385 | 245
Securities available-for-sale, unrealized losses | (97,159) | (123,219)
Securities available-for-sale, fair value | 861,832 | 1,031,179
US Treasury Securities and US Government Agencies Debt Securities [Member] |  |
Debt Securities, Available-for-Sale, Amortized Cost | 19,999 | 119,931
Securities available-for-sale, unrealized gains | 0 | 0
Securities available-for-sale, unrealized losses | (33) | (3,662)
Securities available-for-sale, fair value | 19,966 | 116,269
US Government-sponsored Enterprises Debt Securities [Member] |  |
Debt Securities, Available-for-Sale, Amortized Cost | 90,295 | 104,677
Securities available-for-sale, unrealized gains | 127 | 157
Securities available-for-sale, unrealized losses | (3,527) | (4,987)
Securities available-for-sale, fair value | 86,895 | 99,847
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] |  |
Debt Securities, Available-for-Sale, Amortized Cost | 714,538 | 789,145
Securities available-for-sale, unrealized gains | 253 | 83
Securities available-for-sale, unrealized losses | (82,543) | (101,189)
Securities available-for-sale, fair value | 632,248 | 688,039
US States and Political Subdivisions Debt Securities [Member] |  |
Debt Securities, Available-for-Sale, Amortized Cost | 130,055 | 136,579
Securities available-for-sale, unrealized gains | 5 | 5
Securities available-for-sale, unrealized losses | (10,863) | (13,094)
Securities available-for-sale, fair value | 119,197 | 123,490
Other Debt Obligations [Member] |  |
Debt Securities, Available-for-Sale, Amortized Cost | 3,719 | 3,821
Securities available-for-sale, unrealized gains | 0 | 0
Securities available-for-sale, unrealized losses | (193) | (287)
Securities available-for-sale, fair value | $ 3,526 | $ 3,534

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