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Note 2 - INVESTMENT SECURITIES - Amortized Cost and Fair Value of HTM and AFS Investment Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Securities HTM:
Securities HTM, Amortized Cost	$ 954,378		$ 836,060
Securities HTM, Allowance for Credit (Losses)	(263)	$ (263)	(263)	$ (203)	$ (203)	$ (203)
Securities HTM, Gross Unrealized Gains	20,585		27,957
Securities HTM, Gross Unrealized (Losses)	(119,656)		(63,171)
Securities HTM, Fair Value	855,044		800,583
Securities AFS:
Securities AFS, Amortized Cost	320,212		331,337
Securities AFS, Gross Unrealized Gains	483		185
Securities AFS, Gross Unrealized (Losses)	(49,346)		(50,413)
Securities AFS, Fair Value	271,349		281,109
U.S. treasuries and govt. sponsored agency securities
Securities AFS:
Securities AFS, Amortized Cost	16,076		23,113
Securities AFS, Gross Unrealized Gains	2		7
Securities AFS, Gross Unrealized (Losses)	(1,870)		(2,529)
Securities AFS, Fair Value	14,208		20,591
Residential mortgage-backed and related securities
Securities AFS:
Securities AFS, Amortized Cost	60,800		55,641
Securities AFS, Gross Unrealized Gains	245		3
Securities AFS, Gross Unrealized (Losses)	(3,937)		(5,602)
Securities AFS, Fair Value	57,108		50,042
Municipal securities
Securities HTM:
Securities HTM, Amortized Cost	924,179		806,992
Securities HTM, Allowance for Credit (Losses)	(254)	(254)	(254)	(202)	(202)	(202)
Securities HTM, Gross Unrealized Gains	17,002		23,292
Securities HTM, Gross Unrealized (Losses)	(119,656)		(63,164)
Securities HTM, Fair Value	821,271		766,866
Securities AFS:
Securities AFS, Amortized Cost	203,826		204,664
Securities AFS, Gross Unrealized Gains	31
Securities AFS, Gross Unrealized (Losses)	(42,367)		(40,089)
Securities AFS, Fair Value	161,490		164,575
Asset-backed securities
Securities AFS:
Securities AFS, Amortized Cost	4,822		9,053
Securities AFS, Gross Unrealized Gains	96		171
Securities AFS, Fair Value	4,918		9,224
Corporate securities
Securities HTM:
Securities HTM, Amortized Cost	29,149		28,018
Securities HTM, Allowance for Credit (Losses)	(8)	(8)	(8)
Securities HTM, Gross Unrealized Gains	3,583		4,665
Securities HTM, Fair Value	32,724		32,675
Securities AFS:
Securities AFS, Amortized Cost	34,688		38,866
Securities AFS, Allowance for Credit (Losses)						(989)
Securities AFS, Gross Unrealized Gains	109		4
Securities AFS, Gross Unrealized (Losses)	(1,172)		(2,193)
Securities AFS, Fair Value	33,625		36,677
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)
Securities HTM, Fair Value	$ 1,049		$ 1,042

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