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Note 3 - Investment Securities - Securities in an Unrealized Loss Position (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Temporarily impaired securities, fair value	$ 579,209	$ 608,473
Temporarily impaired securities, unrealized losses	(90,879)	(87,204)
Temporarily impaired securities, fair value, less than 12 months	159,509	307,425
Temporarily impaired securities, unrealized losses, less than 12 months	(7,543)	(21,450)
Temporarily impaired securities, fair value, 12 months or longer	419,700	301,048
Temporarily impaired securities, unrealized losses, 12 months or longer	(83,336)	(65,754)
US Government Agencies Debt Securities [Member]
Temporarily impaired securities, fair value	43,154	44,451
Temporarily impaired securities, unrealized losses	(10,949)	(10,439)
Temporarily impaired securities, fair value, less than 12 months	4,565	20,517
Temporarily impaired securities, unrealized losses, less than 12 months	(347)	(1,831)
Temporarily impaired securities, fair value, 12 months or longer	38,589	23,934
Temporarily impaired securities, unrealized losses, 12 months or longer	(10,602)	(8,608)
Residential Mortgage-Backed Securities [Member]
Temporarily impaired securities, fair value	395,195	403,039
Temporarily impaired securities, unrealized losses	(56,810)	(57,863)
Temporarily impaired securities, fair value, less than 12 months	130,196	218,918
Temporarily impaired securities, unrealized losses, less than 12 months	(5,818)	(13,869)
Temporarily impaired securities, fair value, 12 months or longer	264,999	184,121
Temporarily impaired securities, unrealized losses, 12 months or longer	(50,992)	(43,994)
Commercial Mortgage-Backed Securities [Member]
Temporarily impaired securities, fair value	21,210	21,105
Temporarily impaired securities, unrealized losses	(4,154)	(4,381)
Temporarily impaired securities, fair value, less than 12 months	0	14,523
Temporarily impaired securities, unrealized losses, less than 12 months	0	(2,304)
Temporarily impaired securities, fair value, 12 months or longer	21,210	6,582
Temporarily impaired securities, unrealized losses, 12 months or longer	(4,154)	(2,077)
US States and Political Subdivisions Debt Securities [Member]
Temporarily impaired securities, fair value	116,310	133,265
Temporarily impaired securities, unrealized losses	(18,884)	(14,462)
Temporarily impaired securities, fair value, less than 12 months	22,408	47,446
Temporarily impaired securities, unrealized losses, less than 12 months	(1,320)	(3,404)
Temporarily impaired securities, fair value, 12 months or longer	93,902	85,819
Temporarily impaired securities, unrealized losses, 12 months or longer	(17,564)	(11,058)
Corporate Debt Securities [Member]
Temporarily impaired securities, fair value	1,959	4,973
Temporarily impaired securities, unrealized losses	(41)	(26)
Temporarily impaired securities, fair value, less than 12 months	1,959	4,973
Temporarily impaired securities, unrealized losses, less than 12 months	(41)	(26)
Temporarily impaired securities, fair value, 12 months or longer	0	0
Temporarily impaired securities, unrealized losses, 12 months or longer	0	0
Asset-Backed Securities [Member]
Temporarily impaired securities, fair value	1,381	1,640
Temporarily impaired securities, unrealized losses	(41)	(33)
Temporarily impaired securities, fair value, less than 12 months	381	1,048
Temporarily impaired securities, unrealized losses, less than 12 months	(17)	(16)
Temporarily impaired securities, fair value, 12 months or longer	1,000	592
Temporarily impaired securities, unrealized losses, 12 months or longer	$ (24)	$ (17)

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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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