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Note 8 - Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Temporarily impaired securities, less than 12 months, fair value	$ 973,769	$ 639,985
Temporarily impaired securities, less than 12 months, unrealized losses	75,681	9,198
Temporarily impaired securities, 12 months or longer, fair value	180,404	28,429
Temporarily impaired securities, 12 months or longer, unrealized losses	27,434	1,435
Temporarily impaired securities, total fair value	1,154,173	668,414
Temporarily impaired securities, total unrealized losses	103,115	10,633
US Treasury Securities [Member]
Temporarily impaired securities, less than 12 months, fair value	118,998
Temporarily impaired securities, less than 12 months, unrealized losses	825
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	118,998
Temporarily impaired securities, total unrealized losses	825
US Government Corporations and Agencies Securities [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	2,184	2,337
Temporarily impaired securities, 12 months or longer, unrealized losses	125	135
Temporarily impaired securities, total fair value	2,184	2,337
Temporarily impaired securities, total unrealized losses	125	135
Collateralized Mortgage-Backed Securities [Member]
Temporarily impaired securities, less than 12 months, fair value	705,908	527,276
Temporarily impaired securities, less than 12 months, unrealized losses	65,450	6,659
Temporarily impaired securities, 12 months or longer, fair value	132,913	6,496
Temporarily impaired securities, 12 months or longer, unrealized losses	22,948	755
Temporarily impaired securities, total fair value	838,821	533,772
Temporarily impaired securities, total unrealized losses	88,398	7,414
Collateralized Mortgage Obligations [Member]
Temporarily impaired securities, less than 12 months, fair value	14,793	8,989
Temporarily impaired securities, less than 12 months, unrealized losses	163	417
Temporarily impaired securities, 12 months or longer, fair value	7,787	128
Temporarily impaired securities, 12 months or longer, unrealized losses	1,206	13
Temporarily impaired securities, total fair value	22,580	9,117
Temporarily impaired securities, total unrealized losses	1,369	430
Corporate Debt Securities [Member]
Temporarily impaired securities, less than 12 months, fair value	134,070	103,720
Temporarily impaired securities, less than 12 months, unrealized losses	9,243	2,122
Temporarily impaired securities, 12 months or longer, fair value	37,520	19,468
Temporarily impaired securities, 12 months or longer, unrealized losses	3,155	532
Temporarily impaired securities, total fair value	171,590	123,188
Temporarily impaired securities, total unrealized losses	$ 12,398	$ 2,654

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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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