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Note 7 - Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Temporarily impaired securities, less than 12 months, fair value	$ 706,923	$ 132,580
Temporarily impaired securities, less than 12 months, unrealized losses	599	680
Temporarily impaired securities, 12 months or longer, fair value	918,553	964,495
Temporarily impaired securities, 12 months or longer, unrealized losses	131,075	121,345
Temporarily impaired securities, total fair value	1,625,476	1,097,075
Temporarily impaired securities, total unrealized losses	131,674	122,025
US Treasury Securities [Member]
Temporarily impaired securities, less than 12 months, fair value	545,000	49,831
Temporarily impaired securities, less than 12 months, unrealized losses	93	20
Temporarily impaired securities, 12 months or longer, fair value	0	0
Temporarily impaired securities, 12 months or longer, unrealized losses	0	0
Temporarily impaired securities, total fair value	545,000	49,831
Temporarily impaired securities, total unrealized losses	93	20
US Government Corporations and Agencies Securities [Member]
Temporarily impaired securities, less than 12 months, fair value	1,303	18,301
Temporarily impaired securities, less than 12 months, unrealized losses	1	108
Temporarily impaired securities, 12 months or longer, fair value	2,426	1,313
Temporarily impaired securities, 12 months or longer, unrealized losses	117	122
Temporarily impaired securities, total fair value	3,729	19,614
Temporarily impaired securities, total unrealized losses	118	230
US Government-sponsored Enterprises Debt Securities [Member]
Temporarily impaired securities, less than 12 months, fair value	79,734
Temporarily impaired securities, less than 12 months, unrealized losses	51
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	79,734
Temporarily impaired securities, total unrealized losses	51
Collateralized Mortgage-Backed Securities [Member]
Temporarily impaired securities, less than 12 months, fair value	16,029	0
Temporarily impaired securities, less than 12 months, unrealized losses	245	0
Temporarily impaired securities, 12 months or longer, fair value	711,787	768,274
Temporarily impaired securities, 12 months or longer, unrealized losses	117,461	106,442
Temporarily impaired securities, total fair value	727,816	768,274
Temporarily impaired securities, total unrealized losses	117,706	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	26,079	28,044
Temporarily impaired securities, 12 months or longer, unrealized losses	3,472	3,194
Temporarily impaired securities, total fair value	26,079	28,044
Temporarily impaired securities, total unrealized losses	3,472	3,194
Corporate Debt Securities [Member]
Temporarily impaired securities, less than 12 months, fair value	64,857	64,448
Temporarily impaired securities, less than 12 months, unrealized losses	209	552
Temporarily impaired securities, 12 months or longer, fair value	178,261	166,864
Temporarily impaired securities, 12 months or longer, unrealized losses	10,025	11,587
Temporarily impaired securities, total fair value	243,118	231,312
Temporarily impaired securities, total unrealized losses	$ 10,234	$ 12,139

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