Note 16 - Accumulated Other Comprehensive Income (Loss) - Reclassifications Out of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Securities gains, net	$ 0	$ 814
Income taxes	2,991	1,585
Total reclassifications	11,289	8,542
Reclassification out of Accumulated Other Comprehensive Income [Member]
Securities gains, net		814
Total reclassifications	0	638
Reclassification out of Accumulated Other Comprehensive Income [Member] | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Securities gains, net	0
Income taxes	$ 0	$ (176)