NOTE 9 - REGULATORY CAPITAL REQUIREMENTS - (Details) $ in Thousands	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Total risk-based capital, actual, amount	$ 785,424	$ 721,004
Total risk-based capital, actual, ratio	0.1464	14.95
Total risk-based capital for capital adequacy purposes, amount, without capital conservation buffer	$ 429,282	$ 385,832
Total risk-based capital for capital adequacy purposes, ratio, without capital conservation buffer	8.00%	8.00%
Total risk-based capital for capital adequacy purposes, amount	$ 563,433	$ 506,404
Total risk-based capital for capital adequacy purposes, ratio	10.50	10.50
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 536,603	$ 482,290
Total risk-based capital to be well capitalized under prompt corrective action provisions, ratio	10.00	10.00
Tier 1 risk-based capital, actual, amount	$ 604,268	$ 546,729
Tier 1 risk-based capital, actual, ratio	0.1126	11.34
Tier 1 risk-based capital for capital adequacy purposes, amount, without capital conservation buffer	$ 321,962	$ 289,374
Tier 1 risk-based capital for capital adequacy purposes, ratio, without capital conservation buffer	6.00%	6.00%
Tier 1 risk-based capital for capital adequacy purposes, amount	$ 456,113	$ 409,946
Tier 1 risk-based capital for capital adequacy purposes, ratio	8.50	8.50
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 429,282	$ 385,832
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio	8.00	8.00
Tier 1 leverage, actual, amount	$ 604,268	$ 546,729
Tier 1 leverage, actual, ratio	0.1028	9.49
Tier 1 leverage for capital adequacy purposes, amount, without capital conservation buffer	$ 235,118	$ 230,345
Tier 1 leverage for capital adequacy purposes, ratio, without capital conservation buffer	4.00%	4.00%
Tier 1 leverage for capital adequacy purposes, amount	$ 235,118	$ 230,345
Tier 1 leverage for capital adequacy purposes, ratio	4.00	4.00
Tier 1 leverage to be well capitalized under prompt corrective action provisions, amount	$ 293,897	$ 287,931
Tier 1 leverage to be well capitalized under prompt corrective action provisions, ratio	5.00	5.00
Common equity Tier 1, actual, amount	$ 566,165	$ 508,736
Common equity Tier 1, actual ratio	0.1055	10.55
Common equity Tier 1 for capital adequacy purposes, amount, without capital conservation buffer	$ 241,471	$ 217,030
Common equity Tier 1 for capital adequacy purposes, ratio, without capital conservation buffer	4.50%	4.50%
Common equity Tier 1 for capital adequacy purposes, amount	$ 375,622	$ 337,603
Common equity Tier 1 for capital adequacy purposes, ratio	7.00%	7.00%
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, amount	$ 348,792	$ 313,488
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, ratio	6.50%	6.50%
QCBT
Total risk-based capital, actual, amount	$ 237,936	$ 213,608
Total risk-based capital, actual, ratio	0.1307	12.24
Total risk-based capital for capital adequacy purposes, amount, without capital conservation buffer	$ 145,613	$ 139,581
Total risk-based capital for capital adequacy purposes, ratio, without capital conservation buffer	8.00%	8.00%
Total risk-based capital for capital adequacy purposes, amount	$ 191,117	$ 183,200
Total risk-based capital for capital adequacy purposes, ratio	10.50	10.50
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 182,017	$ 174,477
Total risk-based capital to be well capitalized under prompt corrective action provisions, ratio	10.00	10.00
Tier 1 risk-based capital, actual, amount	$ 215,059	$ 191,693
Tier 1 risk-based capital, actual, ratio	0.1182	10.99
Tier 1 risk-based capital for capital adequacy purposes, amount, without capital conservation buffer	$ 109,210	$ 104,686
Tier 1 risk-based capital for capital adequacy purposes, ratio, without capital conservation buffer	6.00%	6.00%
Tier 1 risk-based capital for capital adequacy purposes, amount	$ 154,714	$ 148,305
Tier 1 risk-based capital for capital adequacy purposes, ratio	8.50	8.50
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 145,613	$ 139,581
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio	8.00	8.00
Tier 1 leverage, actual, amount	$ 215,059	$ 191,693
Tier 1 leverage, actual, ratio	0.1033	8.48
Tier 1 leverage for capital adequacy purposes, amount, without capital conservation buffer	$ 83,257	$ 90,430
Tier 1 leverage for capital adequacy purposes, ratio, without capital conservation buffer	4.00%	4.00%
Tier 1 leverage for capital adequacy purposes, amount	$ 83,257	$ 90,430
Tier 1 leverage for capital adequacy purposes, ratio	4.00	4.00
Tier 1 leverage to be well capitalized under prompt corrective action provisions, amount	$ 104,071	$ 113,038
Tier 1 leverage to be well capitalized under prompt corrective action provisions, ratio	5.00	5.00
Common equity Tier 1, actual, amount	$ 215,059	$ 191,693
Common equity Tier 1, actual ratio	0.1182	10.99
Common equity Tier 1 for capital adequacy purposes, amount, without capital conservation buffer	$ 81,907	$ 78,514
Common equity Tier 1 for capital adequacy purposes, ratio, without capital conservation buffer	4.50%	4.50%
Common equity Tier 1 for capital adequacy purposes, amount	$ 127,412	$ 122,134
Common equity Tier 1 for capital adequacy purposes, ratio	7.00%	7.00%
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, amount	$ 118,311	$ 113,410
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, ratio	6.50%	6.50%
CRBT
Total risk-based capital, actual, amount	$ 264,015	$ 217,227
Total risk-based capital, actual, ratio	0.1439	13.14
Total risk-based capital for capital adequacy purposes, amount, without capital conservation buffer	$ 146,780	$ 132,269
Total risk-based capital for capital adequacy purposes, ratio, without capital conservation buffer	8.00%	8.00%
Total risk-based capital for capital adequacy purposes, amount	$ 192,649	$ 173,603
Total risk-based capital for capital adequacy purposes, ratio	10.50	10.50
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 183,475	$ 165,336
Total risk-based capital to be well capitalized under prompt corrective action provisions, ratio	10.00	10.00
Tier 1 risk-based capital, actual, amount	$ 241,037	$ 196,438
Tier 1 risk-based capital, actual, ratio	0.1314	11.88
Tier 1 risk-based capital for capital adequacy purposes, amount, without capital conservation buffer	$ 110,085	$ 99,202
Tier 1 risk-based capital for capital adequacy purposes, ratio, without capital conservation buffer	6.00%	6.00%
Tier 1 risk-based capital for capital adequacy purposes, amount	$ 155,954	$ 140,536
Tier 1 risk-based capital for capital adequacy purposes, ratio	8.50	8.50
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 146,780	$ 132,269
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio	8.00	8.00
Tier 1 leverage, actual, amount	$ 241,037	$ 196,438
Tier 1 leverage, actual, ratio	0.1220	10.01
Tier 1 leverage for capital adequacy purposes, amount, without capital conservation buffer	$ 79,004	$ 78,535
Tier 1 leverage for capital adequacy purposes, ratio, without capital conservation buffer	4.00%	4.00%
Tier 1 leverage for capital adequacy purposes, amount	$ 79,004	$ 78,535
Tier 1 leverage for capital adequacy purposes, ratio	4.00	4.00
Tier 1 leverage to be well capitalized under prompt corrective action provisions, amount	$ 98,755	$ 98,169
Tier 1 leverage to be well capitalized under prompt corrective action provisions, ratio	5.00	5.00
Common equity Tier 1, actual, amount	$ 241,037	$ 196,438
Common equity Tier 1, actual ratio	0.1314	11.88
Common equity Tier 1 for capital adequacy purposes, amount, without capital conservation buffer	$ 82,564	$ 74,401
Common equity Tier 1 for capital adequacy purposes, ratio, without capital conservation buffer	4.50%	4.50%
Common equity Tier 1 for capital adequacy purposes, amount	$ 128,433	$ 115,735
Common equity Tier 1 for capital adequacy purposes, ratio	7.00%	7.00%
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, amount	$ 119,259	$ 107,469
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, ratio	6.50%	6.50%
CSB
Total risk-based capital, actual, amount	$ 118,637	$ 108,040
Total risk-based capital, actual, ratio	0.1169	12.69
Total risk-based capital for capital adequacy purposes, amount, without capital conservation buffer	$ 81,208	$ 68,117
Total risk-based capital for capital adequacy purposes, ratio, without capital conservation buffer	8.00%	8.00%
Total risk-based capital for capital adequacy purposes, amount	$ 106,585	$ 89,404
Total risk-based capital for capital adequacy purposes, ratio	10.50	10.50
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 101,510	$ 85,146
Total risk-based capital to be well capitalized under prompt corrective action provisions, ratio	10.00	10.00
Tier 1 risk-based capital, actual, amount	$ 105,894	$ 97,350
Tier 1 risk-based capital, actual, ratio	0.1043	11.43
Tier 1 risk-based capital for capital adequacy purposes, amount, without capital conservation buffer	$ 60,906	$ 51,088
Tier 1 risk-based capital for capital adequacy purposes, ratio, without capital conservation buffer	6.00%	6.00%
Tier 1 risk-based capital for capital adequacy purposes, amount	$ 86,283	$ 72,374
Tier 1 risk-based capital for capital adequacy purposes, ratio	8.50	8.50
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 81,208	$ 68,117
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio	8.00	8.00
Tier 1 leverage, actual, amount	$ 105,894	$ 97,350
Tier 1 leverage, actual, ratio	0.0980	10.27
Tier 1 leverage for capital adequacy purposes, amount, without capital conservation buffer	$ 43,204	$ 37,930
Tier 1 leverage for capital adequacy purposes, ratio, without capital conservation buffer	4.00%	4.00%
Tier 1 leverage for capital adequacy purposes, amount	$ 43,204	$ 37,930
Tier 1 leverage for capital adequacy purposes, ratio	4.00	4.00
Tier 1 leverage to be well capitalized under prompt corrective action provisions, amount	$ 54,005	$ 47,412
Tier 1 leverage to be well capitalized under prompt corrective action provisions, ratio	5.00	5.00
Common equity Tier 1, actual, amount	$ 105,894	$ 97,350
Common equity Tier 1, actual ratio	0.1043	11.43
Common equity Tier 1 for capital adequacy purposes, amount, without capital conservation buffer	$ 45,679	$ 38,316
Common equity Tier 1 for capital adequacy purposes, ratio, without capital conservation buffer	4.50%	4.50%
Common equity Tier 1 for capital adequacy purposes, amount	$ 71,057	$ 59,602
Common equity Tier 1 for capital adequacy purposes, ratio	7.00%	7.00%
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, amount	$ 65,981	$ 55,345
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, ratio	6.50%	6.50%
SFCB
Total risk-based capital, actual, amount	$ 96,864	$ 90,334
Total risk-based capital, actual, ratio	0.1277	14.35
Total risk-based capital for capital adequacy purposes, amount, without capital conservation buffer	$ 60,706	$ 50,357
Total risk-based capital for capital adequacy purposes, ratio, without capital conservation buffer	8.00%	8.00%
Total risk-based capital for capital adequacy purposes, amount	$ 79,676	$ 66,094
Total risk-based capital for capital adequacy purposes, ratio	10.50	10.50
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 75,882	$ 62,947
Total risk-based capital to be well capitalized under prompt corrective action provisions, ratio	10.00	10.00
Tier 1 risk-based capital, actual, amount	$ 87,367	$ 77,668
Tier 1 risk-based capital, actual, ratio	0.1151	12.34
Tier 1 risk-based capital for capital adequacy purposes, amount, without capital conservation buffer	$ 45,529	$ 37,768
Tier 1 risk-based capital for capital adequacy purposes, ratio, without capital conservation buffer	6.00%	6.00%
Tier 1 risk-based capital for capital adequacy purposes, amount	$ 64,500	$ 53,505
Tier 1 risk-based capital for capital adequacy purposes, ratio	8.50	8.50
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 60,706	$ 50,357
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio	8.00	8.00
Tier 1 leverage, actual, amount	$ 87,367	$ 77,668
Tier 1 leverage, actual, ratio	0.1067	10.87
Tier 1 leverage for capital adequacy purposes, amount, without capital conservation buffer	$ 32,751	$ 28,575
Tier 1 leverage for capital adequacy purposes, ratio, without capital conservation buffer	4.00%	4.00%
Tier 1 leverage for capital adequacy purposes, amount	$ 32,751	$ 28,575
Tier 1 leverage for capital adequacy purposes, ratio	4.00	4.00
Tier 1 leverage to be well capitalized under prompt corrective action provisions, amount	$ 40,939	$ 35,719
Tier 1 leverage to be well capitalized under prompt corrective action provisions, ratio	5.00	5.00
Common equity Tier 1, actual, amount	$ 87,367	$ 77,668
Common equity Tier 1, actual ratio	0.1151	12.34
Common equity Tier 1 for capital adequacy purposes, amount, without capital conservation buffer	$ 34,147	$ 28,326
Common equity Tier 1 for capital adequacy purposes, ratio, without capital conservation buffer	4.50%	4.50%
Common equity Tier 1 for capital adequacy purposes, amount	$ 53,117	$ 44,063
Common equity Tier 1 for capital adequacy purposes, ratio	7.00%	7.00%
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, amount	$ 49,223	$ 40,915
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, ratio	6.50%	6.50%