NOTE 9 - REGULATORY CAPITAL REQUIREMENTS - (Details) $ in Thousands	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Total risk-based capital, actual, amount	$ 740,281	$ 721,004
Total risk-based capital, actual, ratio	0.1485	14.95
Total risk-based capital for capital adequacy purposes, amount, without capital conservation buffer	$ 398,804	$ 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	$ 523,430	$ 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	$ 498,505	$ 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	$ 563,872	$ 546,729
Tier 1 risk-based capital, actual, ratio	0.1131	11.34
Tier 1 risk-based capital for capital adequacy purposes, amount, without capital conservation buffer	$ 299,103	$ 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	$ 423,729	$ 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	$ 398,804	$ 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	$ 563,872	$ 546,729
Tier 1 leverage, actual, ratio	0.1010	9.49
Tier 1 leverage for capital adequacy purposes, amount, without capital conservation buffer	$ 223,424	$ 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	$ 223,424	$ 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	$ 279,280	$ 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	$ 525,842	$ 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	$ 224,327	$ 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	$ 348,953	$ 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	$ 324,028	$ 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	$ 219,423	$ 213,608
Total risk-based capital, actual, ratio	0.1270	12.24
Total risk-based capital for capital adequacy purposes, amount, without capital conservation buffer	$ 138,239	$ 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	$ 181,439	$ 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	$ 172,799	$ 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	$ 197,676	$ 191,693
Tier 1 risk-based capital, actual, ratio	0.1144	10.99
Tier 1 risk-based capital for capital adequacy purposes, amount, without capital conservation buffer	$ 103,679	$ 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	$ 146,879	$ 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	$ 138,239	$ 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	$ 197,676	$ 191,693
Tier 1 leverage, actual, ratio	0.0917	8.48
Tier 1 leverage for capital adequacy purposes, amount, without capital conservation buffer	$ 86,225	$ 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	$ 86,225	$ 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	$ 107,781	$ 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	$ 197,676	$ 191,693
Common equity Tier 1, actual ratio	0.1144	10.99
Common equity Tier 1 for capital adequacy purposes, amount, without capital conservation buffer	$ 77,759	$ 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	$ 120,959	$ 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	$ 112,319	$ 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	$ 231,341	$ 217,227
Total risk-based capital, actual, ratio	0.1359	13.14
Total risk-based capital for capital adequacy purposes, amount, without capital conservation buffer	$ 136,200	$ 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	$ 178,762	$ 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	$ 170,250	$ 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	$ 209,954	$ 196,438
Tier 1 risk-based capital, actual, ratio	0.1233	11.88
Tier 1 risk-based capital for capital adequacy purposes, amount, without capital conservation buffer	$ 102,150	$ 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	$ 144,712	$ 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	$ 136,200	$ 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	$ 209,954	$ 196,438
Tier 1 leverage, actual, ratio	0.1127	10.01
Tier 1 leverage for capital adequacy purposes, amount, without capital conservation buffer	$ 74,536	$ 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	$ 74,536	$ 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	$ 93,170	$ 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	$ 209,954	$ 196,438
Common equity Tier 1, actual ratio	0.1233	11.88
Common equity Tier 1 for capital adequacy purposes, amount, without capital conservation buffer	$ 76,612	$ 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	$ 119,175	$ 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	$ 110,662	$ 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	$ 110,491	$ 108,040
Total risk-based capital, actual, ratio	0.1239	12.69
Total risk-based capital for capital adequacy purposes, amount, without capital conservation buffer	$ 71,343	$ 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	$ 93,637	$ 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	$ 89,178	$ 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	$ 99,284	$ 97,350
Tier 1 risk-based capital, actual, ratio	0.1113	11.43
Tier 1 risk-based capital for capital adequacy purposes, amount, without capital conservation buffer	$ 53,507	$ 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	$ 75,801	$ 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	$ 71,343	$ 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	$ 99,284	$ 97,350
Tier 1 leverage, actual, ratio	0.0990	10.27
Tier 1 leverage for capital adequacy purposes, amount, without capital conservation buffer	$ 40,116	$ 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	$ 40,116	$ 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	$ 50,144	$ 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	$ 99,284	$ 97,350
Common equity Tier 1, actual ratio	0.1113	11.43
Common equity Tier 1 for capital adequacy purposes, amount, without capital conservation buffer	$ 40,130	$ 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	$ 62,425	$ 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	$ 57,966	$ 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	$ 92,355	$ 90,334
Total risk-based capital, actual, ratio	0.1329	14.35
Total risk-based capital for capital adequacy purposes, amount, without capital conservation buffer	$ 55,576	$ 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	$ 72,944	$ 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	$ 69,470	$ 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	$ 78,645	$ 77,668
Tier 1 risk-based capital, actual, ratio	0.1132	12.34
Tier 1 risk-based capital for capital adequacy purposes, amount, without capital conservation buffer	$ 41,682	$ 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	$ 59,050	$ 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	$ 55,576	$ 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	$ 78,645	$ 77,668
Tier 1 leverage, actual, ratio	0.1066	10.87
Tier 1 leverage for capital adequacy purposes, amount, without capital conservation buffer	$ 29,499	$ 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	$ 29,499	$ 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	$ 36,874	$ 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	$ 78,645	$ 77,668
Common equity Tier 1, actual ratio	0.1132	12.34
Common equity Tier 1 for capital adequacy purposes, amount, without capital conservation buffer	$ 31,262	$ 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	$ 48,629	$ 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	$ 45,156	$ 40,915
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, ratio	6.50%	6.50%