Note 9 - REGULATORY CAPITAL REQUIREMENTS - Capital Requirements (Details) $ in Thousands	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Total risk-based capital, actual, amount	$ 1,135,262	$ 1,055,177
Total risk-based capital, actual, ratio	0.1454	0.1428
Total risk-based capital for capital adequacy purposes, amount	$ 624,805	$ 591,132
Total risk-based capital for capital adequacy purposes, ratio	0.0800	0.0800
Total risk-based capital for capital adequacy purposes with capital conservation buffer, amount	$ 820,057	$ 775,861
Total risk-based capital for capital adequacy purposes with capital conservation buffer, ratio	0.1050	0.1050
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 781,007	$ 738,915
Total risk-based capital to be well capitalized under prompt corrective action provisions, ratio	0.1000	0.1000
Tier 1 risk-based capital, actual, amount	$ 807,582	$ 734,977
Tier 1 risk-based capital, actual, ratio	0.1034	0.0995
Tier 1 risk-based capital for capital adequacy purposes, amount	$ 468,604	$ 443,349
Tier 1 risk-based capital for capital adequacy purposes, ratio	0.0600	0.0600
Tier 1 risk-based capital for capital adequacy purposes with capital conservation buffer, amount	$ 663,856	$ 628,078
Tier 1 risk-based capital for capital adequacy purposes with capital conservation buffer, ratio	0.0850	0.0850
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 624,805	$ 591,132
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio	0.0800	0.0800
Tier 1 leverage, actual, amount	$ 807,582	$ 734,977
Tier 1 leverage, actual, ratio	0.0992	0.0961
Tier 1 leverage for capital adequacy purposes, amount	$ 325,480	$ 305,959
Tier 1 leverage for capital adequacy purposes, ratio	0.0400	0.0400
Tier 1 leverage for capital adequacy purposes with capital conservation buffer, amount	$ 325,480	$ 305,959
Tier 1 leverage for capital adequacy purposes with capital conservation buffer, ratio	0.0400	0.0400
Tier 1 leverage to be well capitalized under prompt corrective action provisions, amount	$ 406,850	$ 382,449
Tier 1 leverage to be well capitalized under prompt corrective action provisions, ratio	0.0500	0.0500
Common equity Tier 1, actual, amount	$ 758,884	$ 686,375
Common equity Tier 1, actual ratio	0.0972	0.0929
Common equity Tier 1 for capital adequacy purposes, amount	$ 351,453	$ 332,512
Common equity Tier 1 for capital adequacy purposes, ratio	4.50%	4.50%
Common equity Tier 1 for capital adequacy purposes with capital conservation buffer, amount	$ 546,705	$ 517,241
Common equity Tier 1 for capital adequacy purposes with capital conservation buffer, ratio	7.00%	7.00%
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, amount	$ 507,654	$ 480,295
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	$ 295,319	$ 275,337
Total risk-based capital, actual, ratio	0.1290	0.1307
Total risk-based capital for capital adequacy purposes, amount	$ 183,095	$ 168,588
Total risk-based capital for capital adequacy purposes, ratio	0.0800	0.0800
Total risk-based capital for capital adequacy purposes with capital conservation buffer, amount	$ 240,313	$ 221,272
Total risk-based capital for capital adequacy purposes with capital conservation buffer, ratio	0.1050	0.1050
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 228,869	$ 210,735
Total risk-based capital to be well capitalized under prompt corrective action provisions, ratio	0.1000	0.1000
Tier 1 risk-based capital, actual, amount	$ 266,688	$ 248,978
Tier 1 risk-based capital, actual, ratio	0.1165	0.1181
Tier 1 risk-based capital for capital adequacy purposes, amount	$ 137,321	$ 126,441
Tier 1 risk-based capital for capital adequacy purposes, ratio	0.0600	0.0600
Tier 1 risk-based capital for capital adequacy purposes with capital conservation buffer, amount	$ 194,539	$ 179,125
Tier 1 risk-based capital for capital adequacy purposes with capital conservation buffer, ratio	0.0850	0.0850
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 183,095	$ 168,588
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio	0.0800	0.0800
Tier 1 leverage, actual, amount	$ 266,688	$ 248,978
Tier 1 leverage, actual, ratio	0.1110	0.1101
Tier 1 leverage for capital adequacy purposes, amount	$ 96,111	$ 90,419
Tier 1 leverage for capital adequacy purposes, ratio	0.0400	0.0400
Tier 1 leverage for capital adequacy purposes with capital conservation buffer, amount	$ 96,111	$ 90,419
Tier 1 leverage for capital adequacy purposes with capital conservation buffer, ratio	0.0400	0.0400
Tier 1 leverage to be well capitalized under prompt corrective action provisions, amount	$ 120,139	$ 133,023
Tier 1 leverage to be well capitalized under prompt corrective action provisions, ratio	0.0500	0.0500
Common equity Tier 1, actual, amount	$ 266,688	$ 248,978
Common equity Tier 1, actual ratio	0.1165	0.1181
Common equity Tier 1 for capital adequacy purposes, amount	$ 102,991	$ 94,831
Common equity Tier 1 for capital adequacy purposes, ratio	4.50%	4.50%
Common equity Tier 1 for capital adequacy purposes with capital conservation buffer, amount	$ 160,208	$ 147,514
Common equity Tier 1 for capital adequacy purposes with capital conservation buffer, ratio	7.00%	7.00%
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, amount	$ 148,765	$ 136,978
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	$ 358,150	$ 308,153
Total risk-based capital, actual, ratio	0.1705	0.1484
Total risk-based capital for capital adequacy purposes, amount	$ 168,021	$ 166,168
Total risk-based capital for capital adequacy purposes, ratio	0.0800	0.0800
Total risk-based capital for capital adequacy purposes with capital conservation buffer, amount	$ 220,527	$ 218,096
Total risk-based capital for capital adequacy purposes with capital conservation buffer, ratio	0.1050	0.1050
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 210,026	$ 207,711
Total risk-based capital to be well capitalized under prompt corrective action provisions, ratio	0.1000	0.1000
Tier 1 risk-based capital, actual, amount	$ 331,423	$ 282,258
Tier 1 risk-based capital, actual, ratio	0.1578	0.1359
Tier 1 risk-based capital for capital adequacy purposes, amount	$ 126,016	$ 124,626
Tier 1 risk-based capital for capital adequacy purposes, ratio	0.0600	0.0600
Tier 1 risk-based capital for capital adequacy purposes with capital conservation buffer, amount	$ 178,522	$ 176,554
Tier 1 risk-based capital for capital adequacy purposes with capital conservation buffer, ratio	0.0850	0.0850
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 168,021	$ 166,168
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio	0.0800	0.0800
Tier 1 leverage, actual, amount	$ 331,423	$ 282,258
Tier 1 leverage, actual, ratio	0.1460	0.1317
Tier 1 leverage for capital adequacy purposes, amount	$ 90,799	$ 85,707
Tier 1 leverage for capital adequacy purposes, ratio	0.0400	0.0400
Tier 1 leverage for capital adequacy purposes with capital conservation buffer, amount	$ 90,799	$ 85,707
Tier 1 leverage for capital adequacy purposes with capital conservation buffer, ratio	0.0400	0.0400
Tier 1 leverage to be well capitalized under prompt corrective action provisions, amount	$ 113,498	$ 107,134
Tier 1 leverage to be well capitalized under prompt corrective action provisions, ratio	0.0500	0.0500
Common equity Tier 1, actual, amount	$ 331,423	$ 282,258
Common equity Tier 1, actual ratio	0.1578	0.1359
Common equity Tier 1 for capital adequacy purposes, amount	$ 94,512	$ 93,470
Common equity Tier 1 for capital adequacy purposes, ratio	4.50%	4.50%
Common equity Tier 1 for capital adequacy purposes with capital conservation buffer, amount	$ 147,018	$ 145,397
Common equity Tier 1 for capital adequacy purposes with capital conservation buffer, ratio	7.00%	7.00%
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, amount	$ 136,517	$ 135,012
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	$ 177,296	$ 142,974
Total risk-based capital, actual, ratio	0.1357	0.1204
Total risk-based capital for capital adequacy purposes, amount	$ 104,554	$ 94,981
Total risk-based capital for capital adequacy purposes, ratio	0.0800	0.0800
Total risk-based capital for capital adequacy purposes with capital conservation buffer, amount	$ 137,227	$ 124,662
Total risk-based capital for capital adequacy purposes with capital conservation buffer, ratio	0.1050	0.1050
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 130,693	$ 118,726
Total risk-based capital to be well capitalized under prompt corrective action provisions, ratio	0.1000	0.1000
Tier 1 risk-based capital, actual, amount	$ 152,596	$ 128,130
Tier 1 risk-based capital, actual, ratio	0.1168	0.1079
Tier 1 risk-based capital for capital adequacy purposes, amount	$ 78,416	$ 71,236
Tier 1 risk-based capital for capital adequacy purposes, ratio	0.0600	0.0600
Tier 1 risk-based capital for capital adequacy purposes with capital conservation buffer, amount	$ 111,089	$ 100,917
Tier 1 risk-based capital for capital adequacy purposes with capital conservation buffer, ratio	0.0850	0.0850
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 104,554	$ 94,981
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio	0.0800	0.0800
Tier 1 leverage, actual, amount	$ 152,596	$ 128,130
Tier 1 leverage, actual, ratio	0.1124	0.1009
Tier 1 leverage for capital adequacy purposes, amount	$ 54,303	$ 50,799
Tier 1 leverage for capital adequacy purposes, ratio	0.0400	0.0400
Tier 1 leverage for capital adequacy purposes with capital conservation buffer, amount	$ 54,303	$ 50,799
Tier 1 leverage for capital adequacy purposes with capital conservation buffer, ratio	0.0400	0.0400
Tier 1 leverage to be well capitalized under prompt corrective action provisions, amount	$ 67,879	$ 63,499
Tier 1 leverage to be well capitalized under prompt corrective action provisions, ratio	0.0500	0.0500
Common equity Tier 1, actual, amount	$ 152,596	$ 128,130
Common equity Tier 1, actual ratio	0.1168	0.1079
Common equity Tier 1 for capital adequacy purposes, amount	$ 58,812	$ 53,427
Common equity Tier 1 for capital adequacy purposes, ratio	4.50%	4.50%
Common equity Tier 1 for capital adequacy purposes with capital conservation buffer, amount	$ 91,485	$ 83,108
Common equity Tier 1 for capital adequacy purposes with capital conservation buffer, ratio	7.00%	7.00%
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, amount	$ 84,950	$ 77,172
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, ratio	6.50%	6.50%
Guaranty Bank
Total risk-based capital, actual, amount	$ 258,732	$ 243,106
Total risk-based capital, actual, ratio	0.1253	0.1224
Total risk-based capital for capital adequacy purposes, amount	$ 165,160	$ 158,903
Total risk-based capital for capital adequacy purposes, ratio	0.0800	0.0800
Total risk-based capital for capital adequacy purposes with capital conservation buffer, amount	$ 216,772	$ 208,560
Total risk-based capital for capital adequacy purposes with capital conservation buffer, ratio	0.1050	0.1050
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 206,450	$ 198,629
Total risk-based capital to be well capitalized under prompt corrective action provisions, ratio	0.1000	0.1000
Tier 1 risk-based capital, actual, amount	$ 236,071	$ 218,647
Tier 1 risk-based capital, actual, ratio	0.1143	0.1101
Tier 1 risk-based capital for capital adequacy purposes, amount	$ 123,870	$ 119,177
Tier 1 risk-based capital for capital adequacy purposes, ratio	0.0600	0.0600
Tier 1 risk-based capital for capital adequacy purposes with capital conservation buffer, amount	$ 175,482	$ 168,834
Tier 1 risk-based capital for capital adequacy purposes with capital conservation buffer, ratio	0.0850	0.0850
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 165,160	$ 158,903
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio	0.0800	0.0800
Tier 1 leverage, actual, amount	$ 236,071	$ 218,647
Tier 1 leverage, actual, ratio	0.1122	0.1090
Tier 1 leverage for capital adequacy purposes, amount	$ 84,130	$ 80,229
Tier 1 leverage for capital adequacy purposes, ratio	0.0400	0.0400
Tier 1 leverage for capital adequacy purposes with capital conservation buffer, amount	$ 84,130	$ 80,229
Tier 1 leverage for capital adequacy purposes with capital conservation buffer, ratio	0.0400	0.0400
Tier 1 leverage to be well capitalized under prompt corrective action provisions, amount	$ 105,162	$ 100,286
Tier 1 leverage to be well capitalized under prompt corrective action provisions, ratio	0.0500	0.0500
Common equity Tier 1, actual, amount	$ 236,071	$ 218,647
Common equity Tier 1, actual ratio	0.1143	0.1101
Common equity Tier 1 for capital adequacy purposes, amount	$ 92,902	$ 89,383
Common equity Tier 1 for capital adequacy purposes, ratio	4.50%	4.50%
Common equity Tier 1 for capital adequacy purposes with capital conservation buffer, amount	$ 144,515	$ 139,040
Common equity Tier 1 for capital adequacy purposes with capital conservation buffer, ratio	7.00%	7.00%
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, amount	$ 134,192	$ 129,109
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, ratio	6.50%	6.50%