NOTE 9 - REGULATORY CAPITAL REQUIREMENTS - (Details) $ in Thousands	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Total risk-based capital, actual, amount	$ 760,593	$ 721,004
Total risk-based capital, actual, ratio	0.1472	14.95
Total risk-based capital for capital adequacy purposes, amount, without capital conservation buffer	$ 413,445	$ 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	$ 542,647	$ 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	$ 516,806	$ 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	$ 581,919	$ 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	$ 310,084	$ 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	$ 439,285	$ 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	$ 413,445	$ 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	$ 581,919	$ 546,729
Tier 1 leverage, actual, ratio	0.1029	9.49
Tier 1 leverage for capital adequacy purposes, amount, without capital conservation buffer	$ 226,250	$ 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	$ 226,250	$ 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	$ 282,812	$ 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	$ 543,852	$ 508,736
Common equity Tier 1, actual ratio	0.1052	10.55
Common equity Tier 1 for capital adequacy purposes, amount, without capital conservation buffer	$ 232,563	$ 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	$ 361,764	$ 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	$ 335,924	$ 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	$ 228,180	$ 213,608
Total risk-based capital, actual, ratio	0.1315	12.24
Total risk-based capital for capital adequacy purposes, amount, without capital conservation buffer	$ 138,799	$ 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	$ 182,174	$ 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	$ 173,499	$ 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	$ 206,355	$ 191,693
Tier 1 risk-based capital, actual, ratio	0.1189	10.99
Tier 1 risk-based capital for capital adequacy purposes, amount, without capital conservation buffer	$ 104,099	$ 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	$ 147,474	$ 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	$ 138,799	$ 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	$ 206,355	$ 191,693
Tier 1 leverage, actual, ratio	0.0975	8.48
Tier 1 leverage for capital adequacy purposes, amount, without capital conservation buffer	$ 84,699	$ 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	$ 84,699	$ 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	$ 105,874	$ 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	$ 206,355	$ 191,693
Common equity Tier 1, actual ratio	0.1189	10.99
Common equity Tier 1 for capital adequacy purposes, amount, without capital conservation buffer	$ 78,075	$ 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	$ 121,449	$ 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	$ 112,774	$ 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	$ 243,211	$ 217,227
Total risk-based capital, actual, ratio	0.1386	13.14
Total risk-based capital for capital adequacy purposes, amount, without capital conservation buffer	$ 140,431	$ 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	$ 184,316	$ 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	$ 175,539	$ 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	$ 221,202	$ 196,438
Tier 1 risk-based capital, actual, ratio	0.1260	11.88
Tier 1 risk-based capital for capital adequacy purposes, amount, without capital conservation buffer	$ 105,323	$ 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	$ 149,208	$ 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	$ 140,431	$ 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	$ 221,202	$ 196,438
Tier 1 leverage, actual, ratio	0.1195	10.01
Tier 1 leverage for capital adequacy purposes, amount, without capital conservation buffer	$ 74,072	$ 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	$ 74,072	$ 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	$ 92,590	$ 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	$ 221,202	$ 196,438
Common equity Tier 1, actual ratio	0.1260	11.88
Common equity Tier 1 for capital adequacy purposes, amount, without capital conservation buffer	$ 78,992	$ 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	$ 122,877	$ 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	$ 114,100	$ 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	$ 114,512	$ 108,040
Total risk-based capital, actual, ratio	0.1199	12.69
Total risk-based capital for capital adequacy purposes, amount, without capital conservation buffer	$ 76,389	$ 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	$ 100,261	$ 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	$ 95,487	$ 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	$ 102,521	$ 97,350
Tier 1 risk-based capital, actual, ratio	0.1074	11.43
Tier 1 risk-based capital for capital adequacy purposes, amount, without capital conservation buffer	$ 57,292	$ 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	$ 81,164	$ 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	$ 76,389	$ 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	$ 102,521	$ 97,350
Tier 1 leverage, actual, ratio	0.0978	10.27
Tier 1 leverage for capital adequacy purposes, amount, without capital conservation buffer	$ 41,943	$ 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	$ 41,943	$ 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	$ 52,429	$ 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	$ 102,521	$ 97,350
Common equity Tier 1, actual ratio	0.1074	11.43
Common equity Tier 1 for capital adequacy purposes, amount, without capital conservation buffer	$ 42,969	$ 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	$ 66,841	$ 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	$ 62,066	$ 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	$ 91,663	$ 90,334
Total risk-based capital, actual, ratio	0.1260	14.35
Total risk-based capital for capital adequacy purposes, amount, without capital conservation buffer	$ 58,189	$ 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	$ 76,373	$ 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	$ 72,736	$ 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	$ 82,554	$ 77,668
Tier 1 risk-based capital, actual, ratio	0.1135	12.34
Tier 1 risk-based capital for capital adequacy purposes, amount, without capital conservation buffer	$ 43,641	$ 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	$ 61,825	$ 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	$ 58,189	$ 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	$ 82,554	$ 77,668
Tier 1 leverage, actual, ratio	0.1053	10.87
Tier 1 leverage for capital adequacy purposes, amount, without capital conservation buffer	$ 31,351	$ 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	$ 31,351	$ 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	$ 39,189	$ 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	$ 82,554	$ 77,668
Common equity Tier 1, actual ratio	0.1135	12.34
Common equity Tier 1 for capital adequacy purposes, amount, without capital conservation buffer	$ 32,731	$ 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	$ 50,915	$ 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	$ 47,278	$ 40,915
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, ratio	6.50%	6.50%