Note 28 - Segments - Financial Information by Business Segment (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net interest income	$ 65,263	$ 62,376	$ 56,984	$ 48,760	$ 46,182	$ 45,483	$ 41,584	$ 37,825	$ 36,252	$ 33,695	$ 33,528	$ 32,446	$ 233,383	$ 171,074	$ 135,921
Provision for credit losses													10,257	(753)	18,418
All other non-interest income													53,038	38,237	28,493
Non-interest expenses	45,946	44,873	44,675	56,297	34,572	34,558	48,177	24,973	29,029	25,646	23,409	23,575	191,791	142,280	101,659
Income before income tax expense													120,484	95,397	67,743
Income tax expense	9,174	9,024	7,547	1,445	7,525	6,902	864	5,461	2,685	1,591	2,348	2,250	27,190	20,752	8,874
Net income	29,910	28,540	26,902	7,942									93,294	74,645	58,869
Less income attributable to NCI	93	85	108	36									322	0	0
Net income attributable to stockholders	29,817	$ 28,455	$ 26,794	$ 7,906	24,589	$ 23,162	$ 4,184	$ 22,710	17,736	$ 14,533	$ 13,368	$ 13,232	92,972	74,645	58,869
Total assets	7,496,261				6,646,025				4,608,629				7,496,261	6,646,025	4,608,629
Fiduciary and Trust [Member]
Wealth management and trust services													36,111	27,613	23,406
Commercial Banking [Member]
Net interest income													232,971	170,775	135,587
Provision for credit losses													10,257	(753)	18,418
All other non-interest income													53,038	38,237	28,493
Non-interest expenses													170,348	128,091	88,820
Income before income tax expense													105,404	81,674	56,842
Income tax expense													23,917	17,774	6,508
Net income													81,487	63,900
Less income attributable to NCI													322
Net income attributable to stockholders													81,165		50,334
Total assets	7,459,312				6,641,916				4,604,998				7,459,312	6,641,916	4,604,998
Commercial Banking [Member] | Fiduciary and Trust [Member]
Wealth management and trust services													0	0	0
Investment Management and Trust [Member]
Net interest income													412	299	334
Provision for credit losses													0	0	0
All other non-interest income													0	0	0
Non-interest expenses													21,443	14,189	12,839
Income before income tax expense													15,080	13,723	10,901
Income tax expense													3,273	2,978	2,366
Net income													11,807	10,745
Less income attributable to NCI													0
Net income attributable to stockholders													11,807		8,535
Total assets	$ 36,949				$ 4,109				$ 3,631				36,949	4,109	3,631
Investment Management and Trust [Member] | Fiduciary and Trust [Member]
Wealth management and trust services													$ 36,111	$ 27,613	$ 23,406