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, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Total revenue	$ 86,319			$ 88,849			$ 225,572	$ 230,303
Net interest income	46,229			44,581			131,720	123,243
Provision for credit losses				20,342			6,713	48,624
Net income (loss) from continuing operations	31,565	$ 22,349	$ 17,982	17,344	$ 13,739	$ 11,228	71,896	42,311
Goodwill	74,066			74,066			74,066	74,066	$ 74,066
Intangibles	9,857			11,902			9,857	11,902	11,381
Total assets	6,014,508			5,864,560			6,014,508	5,864,560	$ 5,682,797
Intersegment Eliminations [Member]
Total revenue	(36,806)			(21,839)			(86,477)	(55,342)
Net interest income	343			280			918	758
Net income (loss) from continuing operations	(36,442)			(21,483)			(85,888)	(54,157)
Total assets	(961,025)			(850,766)			(961,025)	(850,766)
Commercial Banking | QCBT | Operating Segments [Member]
Total revenue	22,630			22,971			65,590	66,370
Net interest income	16,862			16,648			48,800	46,728
Provision for credit losses	247			7,861			2,495	18,583
Net income (loss) from continuing operations	8,704			3,273			24,547	12,995
Goodwill	3,223			3,223			3,223	3,223
Total assets	2,106,631			2,205,934			2,106,631	2,205,934
Commercial Banking | CRBT | Operating Segments [Member]
Total revenue	41,415			44,164			98,270	102,548
Net interest income	14,784			14,432			42,395	38,638
Provision for credit losses	(733)			8,878			759	18,288
Net income (loss) from continuing operations	19,730			13,437			42,271	30,941
Goodwill	14,980			14,980			14,980	14,980
Intangibles	1,824			2,313			1,824	2,313
Total assets	2,019,018			2,012,182			2,019,018	2,012,182
Commercial Banking | CSB | Operating Segments [Member]
Total revenue	11,445			11,159			32,677	31,234
Net interest income	9,303			8,593			26,343	23,631
Provision for credit losses	596			2,493			2,718	7,268
Net income (loss) from continuing operations	3,243			1,888			8,414	3,523
Goodwill	9,888			9,888			9,888	9,888
Intangibles	2,816			3,474			2,816	3,474
Total assets	1,140,933			937,016			1,140,933	937,016
Commercial Banking | SFCB | Operating Segments [Member]
Total revenue	10,886			10,266			28,813	28,490
Net interest income	7,058			6,159			19,606	18,002
Provision for credit losses	(110)			1,110			741	4,485
Net income (loss) from continuing operations	4,590			2,869			10,544	6,714
Goodwill	45,975			45,975			45,975	45,975
Intangibles	5,217			6,115			5,217	6,115
Total assets	880,143			803,478			880,143	803,478
Other Segments | Operating Segments [Member]
Total revenue	36,749			22,128			86,699	57,003
Net interest income	(2,121)			(1,531)			(6,342)	(4,514)
Net income (loss) from continuing operations	31,740			17,360			72,008	42,295
Total assets	$ 828,808			$ 756,716			$ 828,808	$ 756,716