NOTE 8 - BUSINESS SEGMENT INFORMATION - Selected Financial Information on the Company's Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Total revenue	$ 68,199		$ 77,276		$ 139,253	$ 141,454
Net interest income	43,516		40,948		85,491	78,646
Provision for credit losses			19,915		6,713	28,282
Net income (loss) from continuing operations	22,349	$ 17,982	13,739	$ 11,228	40,331	24,967
Goodwill	74,066		74,248		74,066	74,248	$ 74,066
Intangibles	10,365		13,872		10,365	13,872	11,381
Total assets	5,805,165		5,604,761		5,805,165	5,604,761	$ 5,682,797
Intersegment Eliminations [Member]
Total revenue	(102)		(17,788)		(224)	(33,502)
Net interest income	327		245		575	477
Net income (loss) from continuing operations	(26,589)		(17,421)		(49,446)	(32,674)
Total assets	(179,303)		(765,385)		(179,303)	(765,385)
Commercial Banking | QCBT | Operating Segments [Member]
Total revenue	21,676		21,712		42,960	43,399
Net interest income	16,152		15,653		31,938	30,080
Provision for credit losses	136		7,539		2,248	10,722
Net income (loss) from continuing operations	8,679		3,999		15,843	9,723
Goodwill	3,223		3,223		3,223	3,223
Total assets	2,059,634		1,984,245		2,059,634	1,984,245
Commercial Banking | CRBT | Operating Segments [Member]
Total revenue	26,498		35,505		56,855	58,384
Net interest income	14,005		12,820		27,611	24,206
Provision for credit losses	(692)		7,160		1,492	9,410
Net income (loss) from continuing operations	11,145		11,043		22,541	17,504
Goodwill	14,980		14,980		14,980	14,980
Intangibles	1,946		2,437		1,946	2,437
Total assets	1,913,761		2,021,043		1,913,761	2,021,043
Commercial Banking | CSB | Operating Segments [Member]
Total revenue	10,809		9,853		21,232	20,074
Net interest income	8,672		7,538		17,040	15,038
Provision for credit losses	756		2,811		2,122	4,775
Net income (loss) from continuing operations	3,109		569		5,171	1,635
Goodwill	9,888		9,888		9,888	9,888
Intangibles	2,979		3,643		2,979	3,643
Total assets	1,079,930		903,648		1,079,930	903,648
Commercial Banking | SFCB | Operating Segments [Member]
Total revenue	9,181		9,533		17,927	18,224
Net interest income	6,479		6,201		12,548	11,843
Provision for credit losses	(200)		2,405		851	3,375
Net income (loss) from continuing operations	3,685		1,899		5,954	4,105
Goodwill	45,975		45,975		45,975	45,975
Intangibles	5,440		6,344		5,440	6,344
Total assets	850,067		745,470		850,067	745,470
Other Segments | Operating Segments [Member]
Total revenue	137		18,461		503	34,875
Net interest income	(2,119)		(1,509)		(4,221)	(2,998)
Net income (loss) from continuing operations	22,320		13,650		40,268	24,674
Goodwill			182			182
Intangibles			1,448			1,448
Total assets	$ 81,076		$ 715,740		$ 81,076	$ 715,740