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Note 3 - Securities - Schedule of Available for Sale Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Securities available for sale, amortized cost	$ 1,505,098	$ 1,510,681
Securities available for sale, unrealized gains	2,261	1,585
Securities available for sale, unrealized losses	(225,946)	(245,713)
Securities available for sale, fair value	1,281,413	1,266,553
US Treasury and Government [Member]
Securities available for sale, amortized cost	121,239	132,292
Securities available for sale, unrealized gains	23	0
Securities available for sale, unrealized losses	(13,203)	(17,185)
Securities available for sale, fair value	108,059	115,107
US States and Political Subdivisions Debt Securities [Member]
Securities available for sale, amortized cost	595,623	609,950
Securities available for sale, unrealized gains	1,376	1,294
Securities available for sale, unrealized losses	(106,208)	(106,364)
Securities available for sale, fair value	490,791	504,880
Corporate Debt Securities [Member]
Securities available for sale, amortized cost	17,457	17,849
Securities available for sale, unrealized gains	189	172
Securities available for sale, unrealized losses	(446)	(573)
Securities available for sale, fair value	17,200	17,448
Collateralized Mortgage-Backed Securities [Member]
Securities available for sale, amortized cost	616,642	605,350
Securities available for sale, unrealized gains	335	34
Securities available for sale, unrealized losses	(99,608)	(112,517)
Securities available for sale, fair value	517,369	492,867
Collateralized Mortgage Obligations [Member]
Securities available for sale, amortized cost	151,573	142,525
Securities available for sale, unrealized gains	338	85
Securities available for sale, unrealized losses	(6,286)	(8,834)
Securities available for sale, fair value	145,625	133,776
Small Business Administration [Member]
Securities available for sale, amortized cost	2,564	2,715
Securities available for sale, unrealized gains	0	0
Securities available for sale, unrealized losses	(195)	(240)
Securities available for sale, fair value	$ 2,369	$ 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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