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Note 2 - Investment Securities - Held to Maturity Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Securities held-to-maturity, carrying value	$ 212,451	$ 370,171
Securities held-to-maturity, gains	3	2
Securities held-to-maturity, losses	(23,437)	(28,816)
Securities held-to-maturity, fair value	189,017	341,357
US Treasury Securities and US Government Agencies Debt Securities [Member]
Securities held-to-maturity, carrying value	1,981	153,850
Securities held-to-maturity, gains	0	0
Securities held-to-maturity, losses	(50)	(741)
Securities held-to-maturity, fair value	1,931	153,109
US Government-sponsored Enterprises Debt Securities [Member]
Securities held-to-maturity, carrying value	23,467	25,395
Securities held-to-maturity, gains	0	0
Securities held-to-maturity, losses	(1,600)	(2,034)
Securities held-to-maturity, fair value	21,867	23,361
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]
Securities held-to-maturity, carrying value	187,003	190,926
Securities held-to-maturity, gains	3	2
Securities held-to-maturity, losses	(21,787)	(26,041)
Securities held-to-maturity, fair value	$ 165,219	$ 164,887

X

- Definition

Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

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