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Note 3 - Securities - Schedule of Available for Sale Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Securities available for sale, amortized cost	$ 1,497,403	$ 1,510,681
Securities available for sale, unrealized gains	4,130	1,585
Securities available for sale, unrealized losses	(199,767)	(245,713)
Securities available for sale, fair value	1,301,766	1,266,553
US Treasury and Government [Member]
Securities available for sale, amortized cost	105,155	132,292
Securities available for sale, unrealized gains	34	0
Securities available for sale, unrealized losses	(10,237)	(17,185)
Securities available for sale, fair value	94,952	115,107
US States and Political Subdivisions Debt Securities [Member]
Securities available for sale, amortized cost	590,327	609,950
Securities available for sale, unrealized gains	1,916	1,294
Securities available for sale, unrealized losses	(96,449)	(106,364)
Securities available for sale, fair value	495,794	504,880
Corporate Debt Securities [Member]
Securities available for sale, amortized cost	16,674	17,849
Securities available for sale, unrealized gains	167	172
Securities available for sale, unrealized losses	(370)	(573)
Securities available for sale, fair value	16,471	17,448
Collateralized Mortgage-Backed Securities [Member]
Securities available for sale, amortized cost	622,160	605,350
Securities available for sale, unrealized gains	677	34
Securities available for sale, unrealized losses	(87,078)	(112,517)
Securities available for sale, fair value	535,759	492,867
Collateralized Mortgage Obligations [Member]
Securities available for sale, amortized cost	160,784	142,525
Securities available for sale, unrealized gains	1,336	85
Securities available for sale, unrealized losses	(5,468)	(8,834)
Securities available for sale, fair value	156,652	133,776
Small Business Administration [Member]
Securities available for sale, amortized cost	2,303	2,715
Securities available for sale, unrealized gains	0	0
Securities available for sale, unrealized losses	(165)	(240)
Securities available for sale, fair value	$ 2,138	$ 2,475

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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