NOTE 2 - INVESTMENT SECURITIES - Amortized Cost and Fair Value of HTM and AFS Investment Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Jun. 30, 2026	Dec. 31, 2025	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024
Securities HTM:
Securities HTM, Amortized Cost	$ 1,029,879		$ 948,958
Securities HTM, Allowance for Credit (Losses)	(282)	$ (282)	(282)	$ (263)	$ (263)	$ (263)
Securities HTM, Gross Unrealized Gains	6,870		28,719
Securities HTM, Gross Unrealized (Losses)	(116,766)		(56,753)
Securities HTM, Fair Value	919,701		920,642
Securities AFS:
Securities AFS, Amortized Cost	357,936		326,752
Securities AFS, Gross Unrealized Gains	112		424
Securities AFS, Gross Unrealized (Losses)	(72,106)		(47,399)
Securities AFS, Fair Value	285,942		279,777
U.S. treasuries and govt. sponsored agency securities
Securities AFS:
Securities AFS, Amortized Cost	15,543		17,775
Securities AFS, Gross Unrealized Gains	3		4
Securities AFS, Gross Unrealized (Losses)	(2,190)		(1,755)
Securities AFS, Fair Value	13,356		16,024
Residential mortgage-backed and related securities
Securities AFS:
Securities AFS, Amortized Cost	117,477		72,951
Securities AFS, Gross Unrealized Gains	4		151
Securities AFS, Gross Unrealized (Losses)	(11,348)		(4,247)
Securities AFS, Fair Value	106,133		68,855
Municipal securities
Securities HTM:
Securities HTM, Amortized Cost	998,172		918,189
Securities HTM, Allowance for Credit (Losses)	(272)	(272)	(272)	(254)	(254)	(254)
Securities HTM, Gross Unrealized Gains	6,776		26,059
Securities HTM, Gross Unrealized (Losses)	(116,564)		(56,752)
Securities HTM, Fair Value	888,112		887,224
Securities AFS:
Securities AFS, Amortized Cost	204,365		203,613
Securities AFS, Gross Unrealized Gains			27
Securities AFS, Gross Unrealized (Losses)	(58,163)		(40,555)
Securities AFS, Fair Value	146,202		163,085
Asset-backed securities
Securities AFS:
Securities AFS, Amortized Cost	3,590		4,345
Securities AFS, Gross Unrealized Gains	61		94
Securities AFS, Fair Value	3,651		4,439
Corporate securities
Securities HTM:
Securities HTM, Amortized Cost	30,657		29,719
Securities HTM, Allowance for Credit (Losses)	(9)	(9)	(9)	(8)	(8)	(8)
Securities HTM, Gross Unrealized Gains	94		2,660
Securities HTM, Gross Unrealized (Losses)	(195)
Securities HTM, Fair Value	30,547		32,370
Securities AFS:
Securities AFS, Amortized Cost	16,961		28,068
Securities AFS, Gross Unrealized Gains	44		148
Securities AFS, Gross Unrealized (Losses)	(405)		(842)
Securities AFS, Fair Value	16,600		27,374
Other securities
Securities HTM:
Securities HTM, Amortized Cost	1,050		1,050
Securities HTM, Allowance for Credit (Losses)	(1)	$ (1)	(1)	$ (1)	$ (1)	$ (1)
Securities HTM, Gross Unrealized (Losses)	(7)		(1)
Securities HTM, Fair Value	$ 1,042		$ 1,048