Note 27 - Segments - Financial Information by Business Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net interest income	$ 257,040	$ 247,332	$ 233,383
Provision for credit losses	9,725	13,796	10,257
Net interest income after provision expense	247,315	233,536	223,126
All other non-interest income	52,387	52,418	53,038
Total non-interest income	95,230	92,220	89,149
Compensation and employee benefits	121,110	110,327	103,208
Net occupancy and equipment	15,193	16,384	14,298
Technology and communication	19,207	17,318	14,897
Intangible amortization	4,485	4,686	5,544
Other direct and indirect/allocated expenses	38,184	39,114	53,844
Total non-interest expenses	198,179	187,829	191,791
Income before income tax expense	144,366	137,927	120,484
Income tax expense	29,827	30,179	27,190
Net income	114,539	107,748	93,294
Total assets	8,863,419	8,170,102	7,496,261
Less net income attributed to non-controlling interest	0	0	322
Net income available to stockholders	114,539	107,748	92,972
Total assets	8,863,419	8,170,102	7,496,261
Fiduciary and Trust [Member]
Non-interest income	42,843	39,802	36,111
Commercial Banking [Member]
Net interest income	255,990	246,624	232,971
Provision for credit losses	9,725	13,796	10,257
Net interest income after provision expense	246,265	232,828	222,714
All other non-interest income	52,387	52,418	53,038
Total non-interest income	52,387	52,418	53,038
Compensation and employee benefits	103,933	93,680	87,565
Net occupancy and equipment	14,396	13,917	13,631
Technology and communication	16,914	15,476	13,449
Intangible amortization	2,965	3,014	3,720
Other direct and indirect/allocated expenses	36,104	37,229	52,172
Total non-interest expenses	174,312	163,316	170,537
Income before income tax expense	124,340	121,930	105,215
Income tax expense	25,481	26,708	23,917
Net income	98,859	95,222	81,298
Total assets	8,829,602	8,134,923	7,459,312
Less net income attributed to non-controlling interest			322
Net income available to stockholders			80,976
Total assets	8,829,602	8,134,923	7,459,312
Commercial Banking [Member] | Fiduciary and Trust [Member]
Non-interest income	0	0	0
Investment Management and Trust [Member]
Net interest income	1,050	708	412
Provision for credit losses	0	0	0
Net interest income after provision expense	1,050	708	412
All other non-interest income	0	0	0
Total non-interest income	42,843	39,802	36,111
Compensation and employee benefits	17,177	16,647	15,643
Net occupancy and equipment	797	2,467	667
Technology and communication	2,293	1,842	1,448
Intangible amortization	1,520	1,672	1,824
Other direct and indirect/allocated expenses	2,080	1,885	1,672
Total non-interest expenses	23,867	24,513	21,254
Income before income tax expense	20,026	15,997	15,269
Income tax expense	4,346	3,471	3,273
Net income	15,680	12,526	11,996
Total assets	33,817	35,179	36,949
Less net income attributed to non-controlling interest			0
Net income available to stockholders			11,996
Total assets	33,817	35,179	36,949
Investment Management and Trust [Member] | Fiduciary and Trust [Member]
Non-interest income	$ 42,843	$ 39,802	$ 36,111