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Note 7 - Investment Securities - Investment Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Investment securities available for sale, amortized cost	$ 1,535,896	$ 1,668,661
Investment securities available for sale, gross unrealized gains	557	512
Investment securities available for sale, gross unrealized losses	102,413	122,045
Securities AFS	1,434,040	1,547,128
US Treasury Securities [Member]
Investment securities available for sale, amortized cost	541,663	621,212
Investment securities available for sale, gross unrealized gains	10	250
Investment securities available for sale, gross unrealized losses	29	0
Securities AFS	541,644	621,462
US Government Corporations and Agencies Securities [Member]
Investment securities available for sale, amortized cost	8,787	9,226
Investment securities available for sale, gross unrealized gains	50	50
Investment securities available for sale, gross unrealized losses	114	127
Securities AFS	8,723	9,149
Collateralized Mortgage-Backed Securities [Member]
Investment securities available for sale, amortized cost	775,132	797,145
Investment securities available for sale, gross unrealized gains	337	67
Investment securities available for sale, gross unrealized losses	95,794	113,196
Securities AFS	679,675	684,016
Collateralized Mortgage Obligations [Member]
Investment securities available for sale, amortized cost	26,949	27,747
Investment securities available for sale, gross unrealized gains	0	0
Investment securities available for sale, gross unrealized losses	2,286	3,191
Securities AFS	24,663	24,556
Corporate Debt Securities [Member]
Investment securities available for sale, amortized cost	183,365	213,331
Investment securities available for sale, gross unrealized gains	160	145
Investment securities available for sale, gross unrealized losses	4,190	5,531
Securities AFS	$ 179,335	$ 207,945

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