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Note 3 - Investment Securities - Schedule of Marketable Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | $ 652,004 | $ 686,556
Unrealized Gains, Available-for-sale | 37 | 19
Unrealized Losses, Available-for-sale | (84,313) | (98,522)
Allowance for Credit Losses, Available-for-sale | 0 | 0
Available-for-sale, at fair value (amortized cost of $652,004 and $686,556, respectively) | 567,728 | 588,053
Amortized Cost, Held-to-maturity | 268,760 |
Unrealized Gains, Held-to-maturity | 0 | 0
Unrealized Losses, Held-to-maturity | (34,185) | (38,730)
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest | 129 | 131
Debt Securities, Held-to-maturity, Fair Value | 234,575 | 236,986
Amortized Cost, Total investment securities | 920,764 | 962,272
Unrealized Gains, Total investment securities | 37 | 19
Unrealized Losses, Total investment securities | (118,498) | (137,252)
Allowance for Credit Losses, Total investment securities | 129 | 131
Fair Value, Total investment securities | 802,303 | 825,039
US Treasury Securities [Member] |  |
Unrealized Gains, Available-for-sale | 2 | 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 $652,004 and $686,556, respectively) | 10,676 | 30,707
Residential Mortgage-Backed Securities [Member] |  |
Unrealized Gains, Available-for-sale | 35 | 1
Unrealized Losses, Available-for-sale | (80,318) | (92,805)
Allowance for Credit Losses, Available-for-sale | 0 | 0
Available-for-sale, at fair value (amortized cost of $652,004 and $686,556, respectively) | 501,700 | 503,706
Unrealized Gains, Held-to-maturity | 0 | 0
Unrealized Losses, Held-to-maturity | (24,244) | (27,092)
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest | 53 | 54
Debt Securities, Held-to-maturity, Fair Value | 128,880 | 129,001
Commercial Mortgage-Backed Securities [Member] |  |
Unrealized Gains, Available-for-sale | 0 | 0
Unrealized Losses, Available-for-sale | (69) | (99)
Allowance for Credit Losses, Available-for-sale | 0 | 0
Available-for-sale, at fair value (amortized cost of $652,004 and $686,556, respectively) | 1,274 | 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 $652,004 and $686,556, respectively) | 18 | 19
Corporate Bond Securities [Member] |  |
Unrealized Gains, Available-for-sale | 0 | 0
Unrealized Losses, Available-for-sale | (3,924) | (5,616)
Allowance for Credit Losses, Available-for-sale | 0 | 0
Available-for-sale, at fair value (amortized cost of $652,004 and $686,556, respectively) | 54,060 | 52,370
US States and Political Subdivisions Debt Securities [Member] |  |
Unrealized Gains, Held-to-maturity | 0 | 0
Unrealized Losses, Held-to-maturity | (9,941) | (11,638)
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest | 76 | 77
Debt Securities, Held-to-maturity, Fair Value | 105,695 | 107,985
Reported Value Measurement [Member] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 652,004 | 686,556
Amortized Cost, Held-to-maturity | 268,760 | 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 | 10,676 | 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 | 581,983 | 596,510
Amortized Cost, Held-to-maturity | 153,124 | 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 | 1,343 | 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 | 18 | 19
Reported Value Measurement [Member] | Corporate Bond Securities [Member] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 57,984 | 57,986
Reported Value Measurement [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Amortized Cost, Held-to-maturity | $ 115,636 | $ 119,623

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