Note 22 - Segments - Financial Information by Business Segment (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Net interest income	$ 61,315			$ 62,376			$ 185,316	$ 168,120
Provision for credit losses	2,775			4,803			7,750	6,882
All other non-interest income	12,866			15,712			38,100	39,117
Non-interest expenses	46,702			44,873			137,816	145,845
Income before income tax expense	34,734			37,564			107,553	81,400
Income tax expense	7,642			9,024			23,749	18,016
Net income	27,092	$ 27,664	$ 29,048	28,540	$ 26,902	$ 7,942	83,804	63,384
Less net income attributed to NCI	0			85			0	229
Net income available to stockholders	27,092			28,455			83,804	63,155
Segment assets	7,903,430			7,554,210			7,903,430	7,554,210	$ 7,496,261
Fiduciary and Trust [Member]
Wealth management and trust services	10,030			9,152			29,703	26,890
Commercial Banking [Member]
Net interest income	61,155			62,270			184,895	167,811
Provision for credit losses	2,775			4,803			7,750	6,882
All other non-interest income	12,866			15,712			38,100	39,117
Non-interest expenses	41,788			39,370			121,265	129,936
Income before income tax expense	29,458			33,809			93,980	70,110
Income tax expense	6,497			8,209			20,804	15,566
Net income	22,961			25,600			73,176	54,544
Less net income attributed to NCI	0			85			0	229
Net income available to stockholders	22,961			25,515			73,176	54,315
Segment assets	7,867,626			7,522,113			7,867,626	7,522,113
Commercial Banking [Member] | Fiduciary and Trust [Member]
Wealth management and trust services	0			0			0	0
Investment Management and Trust [Member]
Net interest income	160			106			421	309
Provision for credit losses	0			0			0	0
All other non-interest income	0			0			0	0
Non-interest expenses	4,914			5,503			16,551	15,909
Income before income tax expense	5,276			3,755			13,573	11,290
Income tax expense	1,145			815			2,945	2,450
Net income	4,131			2,940			10,628	8,840
Less net income attributed to NCI	0			0			0	0
Net income available to stockholders	4,131			2,940			10,628	8,840
Segment assets	35,804			32,097			35,804	32,097
Investment Management and Trust [Member] | Fiduciary and Trust [Member]
Wealth management and trust services	$ 10,030			$ 9,152			$ 29,703	$ 26,890