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Note 7 - Investment Securities - Investment Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Investment securities available for sale, amortized cost	$ 1,602,696	$ 1,726,080
Investment securities available for sale, gross unrealized gains	1,249	515
Investment securities available for sale, gross unrealized losses	95,589	122,025
Securities AFS	1,508,356	1,604,570
US Treasury Securities [Member]
Investment securities available for sale, amortized cost	494,517	495,167
Investment securities available for sale, gross unrealized gains	494	153
Investment securities available for sale, gross unrealized losses	0	20
Securities AFS	495,011	495,300
US Government Corporations and Agencies Securities [Member]
Investment securities available for sale, amortized cost	10,180	48,282
Investment securities available for sale, gross unrealized gains	61	117
Investment securities available for sale, gross unrealized losses	116	230
Securities AFS	10,125	48,169
Collateralized Mortgage-Backed Securities [Member]
Investment securities available for sale, amortized cost	821,023	892,942
Investment securities available for sale, gross unrealized gains	395	223
Investment securities available for sale, gross unrealized losses	86,882	106,442
Securities AFS	734,536	786,723
Collateralized Mortgage Obligations [Member]
Investment securities available for sale, amortized cost	28,663	31,238
Investment securities available for sale, gross unrealized gains	0	0
Investment securities available for sale, gross unrealized losses	2,229	3,194
Securities AFS	26,434	28,044
Corporate Debt Securities [Member]
Investment securities available for sale, amortized cost	248,313	258,451
Investment securities available for sale, gross unrealized gains	299	22
Investment securities available for sale, gross unrealized losses	6,362	12,139
Securities AFS	$ 242,250	$ 246,334

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