Note 23 - Business Segment Information - Selected Financial Information on the Company's Business Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Total revenue	$ 546,094	$ 373,300	$ 300,577
Net interest income	221,006	231,120	178,233
Provision for loan/lease losses	16,539	8,284	3,486
Net income (loss) from continuing operations	113,558	99,066	98,905
Goodwill	139,027	137,607	74,066	$ 74,066
Intangibles	13,821	16,759	9,349
Total assets	8,538,894	7,948,837	6,096,132
Intersegment Eliminations
Total revenue	(144,474)	(132,322)	(118,930)
Net interest income	1,255	1,388	1,263
Net income (loss) from continuing operations	(139,556)	(130,177)	(117,834)
Total assets	(1,250,661)	(1,079,313)	(973,102)
Commercial Banking | QCBT
Goodwill	3,223	3,223	3,223
Commercial Banking | QCBT | Operating Segments
Total revenue	145,375	103,621	88,689
Net interest income	67,900	71,604	66,232
Provision for loan/lease losses	12,512	1,073	1,519
Net income (loss) from continuing operations	21,766	33,850	34,616
Goodwill	3,223	3,223	3,223
Total assets	2,448,957	2,312,013	2,142,344
Commercial Banking | CRBT
Goodwill	14,980	14,980	14,980
Commercial Banking | CRBT | Operating Segments
Total revenue	201,293	128,070	129,080
Net interest income	67,413	65,392	57,354
Provision for loan/lease losses	2,139	(961)	(697)
Net income (loss) from continuing operations	72,378	53,576	55,411
Goodwill	14,980	14,980	14,980
Intangibles	883	1,225	1,702
Total assets	2,419,146	2,185,500	2,030,279
Commercial Banking | CSB
Goodwill	9,888	9,888	9,888
Commercial Banking | CSB | Operating Segments
Total revenue	73,253	54,129	43,945
Net interest income	43,656	40,781	35,512
Provision for loan/lease losses	1,248	(1,335)	2,219
Net income (loss) from continuing operations	18,027	17,225	12,802
Goodwill	9,888	9,888	9,888
Intangibles	1,430	2,027	2,653
Total assets	1,426,202	1,297,812	1,168,606
Commercial Banking | SFCB. | Operating Segments
Total revenue	128,039	87,880	38,342
Net interest income	56,667	63,734	26,351
Provision for loan/lease losses	640	9,507	445
Net income (loss) from continuing operations	25,280	24,289	14,579
Goodwill	110,936	109,516	45,975
Intangibles	11,508	13,507	4,994
Total assets	2,281,296	2,146,474	882,885
Commercial Banking | Guaranty Bank
Goodwill	110,936	109,516	45,975
Other Segments | Operating Segments
Total revenue	14,260,800	13,192,200	11,945,100
Net interest income	(1,588,500)	(1,177,900)	(847,900)
Net income (loss) from continuing operations	11,566,300	10,030,300	9,933,100
Total assets	$ 121,395,400	$ 108,635,100	$ 84,512,000