Note 7 - Comprehensive (Loss) Income - Reclassification out of Accumulated Other Comprehensive (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Interest income on cash flow hedges	$ 61,439	$ 63,843	$ 121,739	$ 130,927
Income tax expense	6,688	7,437	12,566	16,514
Net income	19,056	21,394	36,261	46,323
Salaries and employee benefits	22,786	21,751	44,982	44,013
Reclassification out of Accumulated Other Comprehensive Income [Member]
Net income	4,053	2,712	8,070	5,644
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Interest income on cash flow hedges	5,683	3,953	11,312	8,220
Income tax expense	(1,598)	(1,189)	(3,180)	(2,473)
Net income	4,085	2,764	8,132	5,747
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Salaries and employee benefits	(43)	(74)	(86)	(148)
Reclassification out of Accumulated Other Comprehensive Income [Member] | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Income tax expense	11	22	24	45
Net income	$ (32)	$ (52)	$ (62)	$ (103)