Note 8 - BUSINESS SEGMENT INFORMATION - Selected Financial Information on the Company's Business Segments (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
Total revenue	$ 135,161			$ 100,362			$ 386,117	$ 258,044
Net interest income	55,255			60,769			165,270	165,902
Provision for credit losses	3,806						11,340	8,284
Net income (loss) from continuing operations	25,121	$ 28,425	$ 27,157	29,294	$ 15,242	$ 23,624	80,703	68,160
Goodwill	139,027			137,607			139,027	137,607	$ 137,607
Intangibles	14,537			17,546			14,537	17,546	16,759
Total assets	8,540,057			7,730,049			8,540,057	7,730,049	$ 7,948,837
Intersegment Eliminations [Member]
Total revenue	(32,197)			(36,311)			(103,606)	(92,383)
Net interest income	284			355			938	1,046
Net income (loss) from continuing operations	(31,092)			(35,783)			(99,658)	(90,768)
Total assets	(1,141,314)			(1,020,338)			(1,141,314)	(1,020,338)
Commercial Banking | QCBT | Operating Segments [Member]
Total revenue	38,165			26,583			106,664	72,785
Net interest income	17,198			18,117			50,590	53,971
Provision for credit losses	2,686			554			7,879	(88)
Net income (loss) from continuing operations	5,856			7,758			17,710	26,153
Goodwill	3,223			3,223			3,223	3,223
Total assets	2,433,084			2,218,166			2,433,084	2,218,166
Commercial Banking | CRBT | Operating Segments [Member]
Total revenue	43,592			34,157			138,018	91,083
Net interest income	16,852			17,160			50,254	46,576
Provision for credit losses	503			(35)			2,499	(971)
Net income (loss) from continuing operations	13,175			14,475			48,928	38,860
Goodwill	14,980			14,980			14,980	14,980
Intangibles	950			1,344			950	1,344
Total assets	2,442,263			2,108,614			2,442,263	2,108,614
Commercial Banking | CSB | Operating Segments [Member]
Total revenue	19,225			14,127			53,126	37,534
Net interest income	11,136			10,183			32,683	29,365
Provision for credit losses	275			(269)			965	(554)
Net income (loss) from continuing operations	4,740			4,106			14,113	11,606
Goodwill	9,888			9,888			9,888	9,888
Intangibles	1,579			2,184			1,579	2,184
Total assets	1,417,249			1,270,426			1,417,249	1,270,426
Commercial Banking | Guaranty Bank | Operating Segments [Member]
Total revenue	34,498			25,523			90,443	57,036
Net interest income	13,743			18,196			42,716	42,789
Provision for credit losses	342			(250)			(3)	9,897
Net income (loss) from continuing operations	6,801			9,196			17,344	13,327
Goodwill	110,936			109,516			110,936	109,516
Intangibles	12,008			14,018			12,008	14,018
Total assets	2,242,638			2,107,407			2,242,638	2,107,407
Other Segments | Operating Segments [Member]
Total revenue	31,878			36,283			101,472	91,989
Net interest income	(3,958)			(3,242)			(11,911)	(7,845)
Net income (loss) from continuing operations	25,641			29,542			82,266	68,982
Total assets	$ 1,146,137			$ 1,045,774			$ 1,146,137	$ 1,045,774