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Note 3 - Investment Securities - Schedule of Marketable Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	$ 620,799	$ 686,556
Unrealized Gains, Available-for-sale	330	19
Unrealized Losses, Available-for-sale	(79,977)	(98,522)
Allowance for Credit Losses, Available-for-sale	0	0
Available-for-sale, at fair value (amortized cost of $620,799 and $686,556, respectively)	541,152	588,053
Amortized Cost, Held-to-maturity	263,833
Unrealized Gains, Held-to-maturity	0	0
Unrealized Losses, Held-to-maturity	(32,329)	(38,730)
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest	127	131
Debt Securities, Held-to-maturity, Fair Value	231,504	236,986
Amortized Cost, Total investment securities	884,632	962,272
Unrealized Gains, Total investment securities	330	19
Unrealized Losses, Total investment securities	(112,306)	(137,252)
Allowance for Credit Losses, Total investment securities	127	131
Fair Value, Total investment securities	772,656	825,039
US Treasury Securities [Member]
Unrealized Gains, Available-for-sale	0	18
Unrealized Losses, Available-for-sale	(1)	(2)
Allowance for Credit Losses, Available-for-sale	0	0
Available-for-sale, at fair value (amortized cost of $620,799 and $686,556, respectively)	637	30,707
Residential Mortgage-Backed Securities [Member]
Unrealized Gains, Available-for-sale	330	1
Unrealized Losses, Available-for-sale	(76,217)	(92,805)
Allowance for Credit Losses, Available-for-sale	0	0
Available-for-sale, at fair value (amortized cost of $620,799 and $686,556, respectively)	488,939	503,706
Unrealized Gains, Held-to-maturity	0	0
Unrealized Losses, Held-to-maturity	(23,559)	(27,092)
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest	52	54
Debt Securities, Held-to-maturity, Fair Value	126,133	129,001
Commercial Mortgage-Backed Securities [Member]
Unrealized Gains, Available-for-sale	0	0
Unrealized Losses, Available-for-sale	(56)	(99)
Allowance for Credit Losses, Available-for-sale	0	0
Available-for-sale, at fair value (amortized cost of $620,799 and $686,556, respectively)	1,280	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 $620,799 and $686,556, respectively)	17	19
Corporate Bond Securities [Member]
Unrealized Gains, Available-for-sale	0	0
Unrealized Losses, Available-for-sale	(3,703)	(5,616)
Allowance for Credit Losses, Available-for-sale	0	0
Available-for-sale, at fair value (amortized cost of $620,799 and $686,556, respectively)	50,279	52,370
US States and Political Subdivisions Debt Securities [Member]
Unrealized Gains, Held-to-maturity	0	0
Unrealized Losses, Held-to-maturity	(8,770)	(11,638)
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest	75	77
Debt Securities, Held-to-maturity, Fair Value	105,371	107,985
Reported Value Measurement [Member]
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	620,799	686,556
Amortized Cost, Held-to-maturity	263,833	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	638	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	564,826	596,510
Amortized Cost, Held-to-maturity	149,692	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	1,336	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	17	19
Reported Value Measurement [Member] | Corporate Bond Securities [Member]
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	53,982	57,986
Reported Value Measurement [Member] | US States and Political Subdivisions Debt Securities [Member]
Amortized Cost, Held-to-maturity	$ 114,141	$ 119,623

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