Note 22 - Segments - Financial Information by Business Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Net interest income	$ 60,070	$ 63,072
Provision for credit losses	1,425	2,625
All other non-interest income	12,500	12,520
Non-interest expenses	48,961	45,314
Income before income tax expense	32,955	37,180
Income tax expense	7,068	8,132
Net income	25,887	29,048
Segment assets	8,123,128	7,667,648	$ 8,170,102
Fiduciary and Trust [Member]
Wealth management and trust services	10,771	9,527
Commercial Banking [Member]
Net interest income	59,794	62,944
Provision for credit losses	1,425	2,625
Wealth management and trust services		0
All other non-interest income	12,500	12,520
Non-interest expenses	42,979	39,600
Income before income tax expense	27,890	33,239
Income tax expense	5,969	7,277
Net income	21,921	25,962
Segment assets	8,087,998	7,631,031
Commercial Banking [Member] | Fiduciary and Trust [Member]
Wealth management and trust services	0	0
Investment Management and Trust [Member]
Net interest income	276	128
Provision for credit losses	0	0
Wealth management and trust services		9,527
All other non-interest income	0	0
Non-interest expenses	5,982	5,714
Income before income tax expense	5,065	3,941
Income tax expense	1,099	855
Net income	3,966	3,086
Segment assets	35,130	$ 36,617
Investment Management and Trust [Member] | Fiduciary and Trust [Member]
Wealth management and trust services	$ 10,771