Note 7 - Comprehensive (Loss) Income - Reclassification out of Accumulated Other Comprehensive (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Interest income on cash flow hedges	$ 60,300	$ 67,084
Income tax expense	5,878	9,077
Net income	17,205	24,929
Salaries and employee benefits	22,196	22,261
Reclassification out of Accumulated Other Comprehensive Income [Member]
Net income	4,017	2,932
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Interest income on cash flow hedges	5,629	4,267
Income tax expense	(1,582)	(1,284)
Net income	4,047	2,983
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Salaries and employee benefits	(43)	(74)
Reclassification out of Accumulated Other Comprehensive Income [Member] | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Income tax expense	13	23
Net income	$ (30)	$ (51)