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Note 3 - Investment Securities - Schedule of Marketable Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | $ 603,221 | $ 686,556
Unrealized Gains, Available-for-sale | 765 | 19
Unrealized Losses, Available-for-sale | (72,972) | (98,522)
Allowance for Credit Losses, Available-for-sale | 0 | 0
Available-for-sale, at fair value (amortized cost of $603,221 and $686,556, respectively) | 531,014 | 588,053
Amortized Cost, Held-to-maturity | 259,351 |
Unrealized Gains, Held-to-maturity | 0 | 0
Unrealized Losses, Held-to-maturity | (28,754) | (38,730)
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest | 126 | 131
Debt Securities, Held-to-maturity, Fair Value | 230,597 | 236,986
Amortized Cost, Total investment securities | 862,572 | 962,272
Unrealized Gains, Total investment securities | 765 | 19
Unrealized Losses, Total investment securities | (101,726) | (137,252)
Allowance for Credit Losses, Total investment securities | 126 | 131
Fair Value, Total investment securities | 761,611 | 825,039
US Treasury Securities [Member] |  |
Unrealized Gains, Available-for-sale | 0 | 18
Unrealized Losses, Available-for-sale | (2) | (2)
Allowance for Credit Losses, Available-for-sale | 0 | 0
Available-for-sale, at fair value (amortized cost of $603,221 and $686,556, respectively) | 446 | 30,707
Residential Mortgage-Backed Securities [Member] |  |
Unrealized Gains, Available-for-sale | 765 | 1
Unrealized Losses, Available-for-sale | (69,173) | (92,805)
Allowance for Credit Losses, Available-for-sale | 0 | 0
Available-for-sale, at fair value (amortized cost of $603,221 and $686,556, respectively) | 479,837 | 503,706
Unrealized Gains, Held-to-maturity | 0 | 0
Unrealized Losses, Held-to-maturity | (21,535) | (27,092)
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest | 51 | 54
Debt Securities, Held-to-maturity, Fair Value | 124,331 | 129,001
Commercial Mortgage-Backed Securities [Member] |  |
Unrealized Gains, Available-for-sale | 0 | 0
Unrealized Losses, Available-for-sale | (50) | (99)
Allowance for Credit Losses, Available-for-sale | 0 | 0
Available-for-sale, at fair value (amortized cost of $603,221 and $686,556, respectively) | 1,279 | 1,251
Asset-Backed Securities [Member] |  |
Unrealized Gains, Available-for-sale | 0 | 0
Unrealized Losses, Available-for-sale | 0 | 0
Allowance for Credit Losses, Available-for-sale | 0 | 0
Available-for-sale, at fair value (amortized cost of $603,221 and $686,556, respectively) | 16 | 19
Corporate Bond Securities [Member] |  |
Unrealized Gains, Available-for-sale | 0 | 0
Unrealized Losses, Available-for-sale | (3,747) | (5,616)
Allowance for Credit Losses, Available-for-sale | 0 | 0
Available-for-sale, at fair value (amortized cost of $603,221 and $686,556, respectively) | 49,436 | 52,370
US States and Political Subdivisions Debt Securities [Member] |  |
Unrealized Gains, Held-to-maturity | 0 | 0
Unrealized Losses, Held-to-maturity | (7,219) | (11,638)
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest | 75 | 77
Debt Securities, Held-to-maturity, Fair Value | 106,266 | 107,985
Reported Value Measurement [Member] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 603,221 | 686,556
Amortized Cost, Held-to-maturity | 259,351 | 275,716
Reported Value Measurement [Member] | US Treasury Securities [Member] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 448 | 30,691
Reported Value Measurement [Member] | Residential Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 548,245 | 596,510
Amortized Cost, Held-to-maturity | 145,866 | 156,093
Reported Value Measurement [Member] | Commercial Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 1,329 | 1,350
Reported Value Measurement [Member] | Asset-Backed Securities [Member] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 16 | 19
Reported Value Measurement [Member] | Corporate Bond Securities [Member] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 53,183 | 57,986
Reported Value Measurement [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Amortized Cost, Held-to-maturity | $ 113,485 | $ 119,623

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