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Note 7 - Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Temporarily impaired securities, less than 12 months, fair value	$ 21,164	$ 132,580
Temporarily impaired securities, less than 12 months, unrealized losses	27	680
Temporarily impaired securities, 12 months or longer, fair value	877,147	964,495
Temporarily impaired securities, 12 months or longer, unrealized losses	95,562	121,345
Temporarily impaired securities, total fair value	898,311	1,097,075
Temporarily impaired securities, total unrealized losses	95,589	122,025
US Treasury Securities [Member]
Temporarily impaired securities, less than 12 months, fair value		49,831
Temporarily impaired securities, less than 12 months, unrealized losses		20
Temporarily impaired securities, 12 months or longer, fair value		0
Temporarily impaired securities, 12 months or longer, unrealized losses		0
Temporarily impaired securities, total fair value		49,831
Temporarily impaired securities, total unrealized losses		20
US Government Corporations and Agencies Securities [Member]
Temporarily impaired securities, less than 12 months, fair value	1,182	18,301
Temporarily impaired securities, less than 12 months, unrealized losses	1	108
Temporarily impaired securities, 12 months or longer, fair value	2,223	1,313
Temporarily impaired securities, 12 months or longer, unrealized losses	115	122
Temporarily impaired securities, total fair value	3,405	19,614
Temporarily impaired securities, total unrealized losses	116	230
Collateralized Mortgage-Backed Securities [Member]
Temporarily impaired securities, less than 12 months, fair value	8	0
Temporarily impaired securities, less than 12 months, unrealized losses	0	0
Temporarily impaired securities, 12 months or longer, fair value	701,624	768,274
Temporarily impaired securities, 12 months or longer, unrealized losses	86,882	106,442
Temporarily impaired securities, total fair value	701,632	768,274
Temporarily impaired securities, total unrealized losses	86,882	106,442
Collateralized Mortgage Obligations [Member]
Temporarily impaired securities, less than 12 months, fair value	0	0
Temporarily impaired securities, less than 12 months, unrealized losses	0	0
Temporarily impaired securities, 12 months or longer, fair value	26,434	28,044
Temporarily impaired securities, 12 months or longer, unrealized losses	2,229	3,194
Temporarily impaired securities, total fair value	26,434	28,044
Temporarily impaired securities, total unrealized losses	2,229	3,194
Corporate Debt Securities [Member]
Temporarily impaired securities, less than 12 months, fair value	19,974	64,448
Temporarily impaired securities, less than 12 months, unrealized losses	26	552
Temporarily impaired securities, 12 months or longer, fair value	146,866	166,864
Temporarily impaired securities, 12 months or longer, unrealized losses	6,336	11,587
Temporarily impaired securities, total fair value	166,840	231,312
Temporarily impaired securities, total unrealized losses	$ 6,362	$ 12,139

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