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Note 3 - Investment Securities - Investment Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Investment securities available for sale, amortized cost	$ 1,668,661	$ 1,726,080
Investment securities available for sale, gross unrealized gains	512	515
Investment securities available for sale, gross unrealized losses	122,045	122,025
Securities AFS	1,547,128	1,604,570
US Treasury Securities [Member]
Investment securities available for sale, amortized cost	621,212	495,167
Investment securities available for sale, gross unrealized gains	250	153
Investment securities available for sale, gross unrealized losses	0	20
Securities AFS	621,462	495,300
US Government Corporations and Agencies Securities [Member]
Investment securities available for sale, amortized cost	9,226	48,282
Investment securities available for sale, gross unrealized gains	50	117
Investment securities available for sale, gross unrealized losses	127	230
Securities AFS	9,149	48,169
Collateralized Mortgage-Backed Securities [Member]
Investment securities available for sale, amortized cost	797,145	892,942
Investment securities available for sale, gross unrealized gains	67	223
Investment securities available for sale, gross unrealized losses	113,196	106,442
Securities AFS	684,016	786,723
Collateralized Mortgage Obligations [Member]
Investment securities available for sale, amortized cost	27,747	31,238
Investment securities available for sale, gross unrealized gains	0	0
Investment securities available for sale, gross unrealized losses	3,191	3,194
Securities AFS	24,556	28,044
Corporate Debt Securities [Member]
Investment securities available for sale, amortized cost	213,331	258,451
Investment securities available for sale, gross unrealized gains	145	22
Investment securities available for sale, gross unrealized losses	5,531	12,139
Securities AFS	$ 207,945	$ 246,334

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