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Note 3 - Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Temporarily impaired securities, less than 12 months, fair value	$ 59,054	$ 132,580
Temporarily impaired securities, less than 12 months, unrealized losses	1,067	680
Temporarily impaired securities, 12 months or longer, fair value	807,644	964,495
Temporarily impaired securities, 12 months or longer, unrealized losses	120,978	121,345
Temporarily impaired securities, total fair value	866,698	1,097,075
Temporarily impaired securities, total unrealized losses	122,045	122,025
US Government Corporations and Agencies Securities [Member]
Temporarily impaired securities, less than 12 months, fair value	4,199	18,301
Temporarily impaired securities, less than 12 months, unrealized losses	8	108
Temporarily impaired securities, 12 months or longer, fair value	2,108	1,313
Temporarily impaired securities, 12 months or longer, unrealized losses	119	122
Temporarily impaired securities, total fair value	6,307	19,614
Temporarily impaired securities, total unrealized losses	127	230
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
Collateralized Mortgage-Backed Securities [Member]
Temporarily impaired securities, less than 12 months, fair value	29,955	0
Temporarily impaired securities, less than 12 months, unrealized losses	959	0
Temporarily impaired securities, 12 months or longer, fair value	653,236	768,274
Temporarily impaired securities, 12 months or longer, unrealized losses	112,237	106,442
Temporarily impaired securities, total fair value	683,191	768,274
Temporarily impaired securities, total unrealized losses	113,196	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	24,556	28,044
Temporarily impaired securities, 12 months or longer, unrealized losses	3,191	3,194
Temporarily impaired securities, total fair value	24,556	28,044
Temporarily impaired securities, total unrealized losses	3,191	3,194
Corporate Debt Securities [Member]
Temporarily impaired securities, less than 12 months, fair value	24,900	64,448
Temporarily impaired securities, less than 12 months, unrealized losses	100	552
Temporarily impaired securities, 12 months or longer, fair value	127,744	166,864
Temporarily impaired securities, 12 months or longer, unrealized losses	5,431	11,587
Temporarily impaired securities, total fair value	152,644	231,312
Temporarily impaired securities, total unrealized losses	$ 5,531	$ 12,139

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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