Note 15 - Accumulated Other Comprehensive Income (Loss) - Reclassifications Out of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Securities gains, net	$ 0	$ 0	$ 0	$ 814
Income taxes	2,713	1,801	8,566	4,808
Total reclassifications	10,178	7,227	32,233	21,251
Reclassification out of Accumulated Other Comprehensive Income [Member]
Total reclassifications	0	0	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	0	0	814
Income taxes	$ 0	$ 0	$ 0	$ (176)