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Note 7 - Investment Securities - Investment Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Investment securities available for sale, amortized cost	$ 1,780,251	$ 1,726,080
Investment securities available for sale, gross unrealized gains	154	515
Investment securities available for sale, gross unrealized losses	131,674	122,025
Securities AFS	1,648,731	1,604,570
US Treasury Securities [Member]
Investment securities available for sale, amortized cost	545,093	495,167
Investment securities available for sale, gross unrealized gains	0	153
Investment securities available for sale, gross unrealized losses	93	20
Securities AFS	545,000	495,300
US Government Corporations and Agencies Securities [Member]
Investment securities available for sale, amortized cost	11,063	48,282
Investment securities available for sale, gross unrealized gains	65	117
Investment securities available for sale, gross unrealized losses	118	230
Securities AFS	11,010	48,169
US Government-sponsored Enterprises Debt Securities [Member]
Investment securities available for sale, amortized cost	79,785
Investment securities available for sale, gross unrealized gains	0
Investment securities available for sale, gross unrealized losses	51
Securities AFS	79,734
Collateralized Mortgage-Backed Securities [Member]
Investment securities available for sale, amortized cost	846,407	892,942
Investment securities available for sale, gross unrealized gains	63	223
Investment securities available for sale, gross unrealized losses	117,706	106,442
Securities AFS	728,764	786,723
Collateralized Mortgage Obligations [Member]
Investment securities available for sale, amortized cost	29,551	31,238
Investment securities available for sale, gross unrealized gains	0	0
Investment securities available for sale, gross unrealized losses	3,472	3,194
Securities AFS	26,079	28,044
Corporate Debt Securities [Member]
Investment securities available for sale, amortized cost	268,352	258,451
Investment securities available for sale, gross unrealized gains	26	22
Investment securities available for sale, gross unrealized losses	10,234	12,139
Securities AFS	$ 258,144	$ 246,334

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