Note 10 - REGULATORY CAPITAL REQUIREMENTS - Capital Requirements (Details) $ in Thousands	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Total risk-based capital, actual, amount	$ 1,181,827	$ 1,171,047
Total risk-based capital, actual, ratio	0.1430	0.1429
Total risk-based capital for capital adequacy purposes, amount	$ 660,989	$ 655,461
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	$ 867,548	$ 860,293
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	$ 826,237	$ 819,327
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	$ 867,778	$ 841,052
Tier 1 risk-based capital, actual, ratio	0.1050	0.1027
Tier 1 risk-based capital for capital adequacy purposes, amount	$ 495,742	$ 491,596
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	$ 702,301	$ 696,428
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	$ 660,989	$ 655,461
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio	0.0800	0.0800
Tier 1 leverage, actual, amount	$ 867,778	$ 841,052
Tier 1 leverage, actual, ratio	0.1033	0.1003
Tier 1 leverage for capital adequacy purposes, amount	$ 336,048	$ 335,420
Tier 1 leverage for capital adequacy purposes, ratio	0.0400	0.0400
Tier 1 leverage for capital adequacy purposes with capital conservation buffer, amount	$ 336,048	$ 335,420
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	$ 420,060	$ 419,275
Tier 1 leverage to be well capitalized under prompt corrective action provisions, ratio	0.0500	0.0500
Common equity Tier 1, actual, amount	$ 819,015	$ 792,321
Common equity Tier 1, actual ratio	0.0991	0.0967
Common equity Tier 1 for capital adequacy purposes, amount	$ 371,806	$ 368,697
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	$ 578,366	$ 573,529
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	$ 537,054	$ 532,562
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	$ 305,569	$ 300,413
Total risk-based capital, actual, ratio	0.1277	0.1267
Total risk-based capital for capital adequacy purposes, amount	$ 191,391	$ 189,707
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	$ 251,201	$ 248,990
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	$ 239,239	$ 237,133
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	$ 275,648	$ 270,744
Tier 1 risk-based capital, actual, ratio	0.1152	0.1142
Tier 1 risk-based capital for capital adequacy purposes, amount	$ 143,543	$ 142,280
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	$ 203,353	$ 201,563
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	$ 191,391	$ 189,707
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio	0.0800	0.0800
Tier 1 leverage, actual, amount	$ 275,648	$ 270,744
Tier 1 leverage, actual, ratio	0.1115	0.1123
Tier 1 leverage for capital adequacy purposes, amount	$ 98,876	$ 96,425
Tier 1 leverage for capital adequacy purposes, ratio	0.0400	0.0400
Tier 1 leverage for capital adequacy purposes with capital conservation buffer, amount	$ 98,876	$ 96,425
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	$ 123,596	$ 120,531
Tier 1 leverage to be well capitalized under prompt corrective action provisions, ratio	0.0500	0.0500
Common equity Tier 1, actual, amount	$ 275,648	$ 270,744
Common equity Tier 1, actual ratio	0.1152	0.1142
Common equity Tier 1 for capital adequacy purposes, amount	$ 107,658	$ 106,710
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	$ 167,467	$ 165,993
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	$ 155,505	$ 154,137
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	$ 398,654	$ 381,514
Total risk-based capital, actual, ratio	0.1553	0.1560
Total risk-based capital for capital adequacy purposes, amount	$ 205,302	$ 195,687
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	$ 269,458	$ 256,840
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	$ 256,627	$ 244,609
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	$ 373,281	$ 354,940
Tier 1 risk-based capital, actual, ratio	0.1455	0.1451
Tier 1 risk-based capital for capital adequacy purposes, amount	$ 153,976	$ 146,766
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	$ 218,133	$ 207,918
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	$ 205,302	$ 195,687
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio	0.0800	0.0800
Tier 1 leverage, actual, amount	$ 373,281	$ 354,940
Tier 1 leverage, actual, ratio	0.1601	0.1477
Tier 1 leverage for capital adequacy purposes, amount	$ 93,236	$ 96,093
Tier 1 leverage for capital adequacy purposes, ratio	0.0400	0.0400
Tier 1 leverage for capital adequacy purposes with capital conservation buffer, amount	$ 93,236	$ 96,093
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	$ 116,545	$ 120,116
Tier 1 leverage to be well capitalized under prompt corrective action provisions, ratio	0.0500	0.0500
Common equity Tier 1, actual, amount	$ 373,281	$ 354,940
Common equity Tier 1, actual ratio	0.1455	0.1451
Common equity Tier 1 for capital adequacy purposes, amount	$ 115,482	$ 110,074
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	$ 179,639	$ 171,227
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	$ 166,808	$ 158,996
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	$ 175,056	$ 171,747
Total risk-based capital, actual, ratio	0.1281	0.1322
Total risk-based capital for capital adequacy purposes, amount	$ 109,305	$ 103,903
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	$ 143,463	$ 136,372
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	$ 136,631	$ 129,878
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	$ 160,919	$ 156,629
Tier 1 risk-based capital, actual, ratio	0.1178	0.1206
Tier 1 risk-based capital for capital adequacy purposes, amount	$ 81,979	$ 77,927
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	$ 116,136	$ 110,397
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	$ 109,305	$ 103,903
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio	0.0800	0.0800
Tier 1 leverage, actual, amount	$ 160,919	$ 156,629
Tier 1 leverage, actual, ratio	0.1131	0.1119
Tier 1 leverage for capital adequacy purposes, amount	$ 56,930	$ 56,005
Tier 1 leverage for capital adequacy purposes, ratio	0.0400	0.0400
Tier 1 leverage for capital adequacy purposes with capital conservation buffer, amount	$ 56,930	$ 56,005
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	$ 71,162	$ 70,007
Tier 1 leverage to be well capitalized under prompt corrective action provisions, ratio	0.0500	0.0500
Common equity Tier 1, actual, amount	$ 160,919	$ 156,629
Common equity Tier 1, actual ratio	0.1178	0.1206
Common equity Tier 1 for capital adequacy purposes, amount	$ 61,484	$ 58,445
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	$ 95,642	$ 90,915
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	$ 88,810	$ 84,421
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	$ 273,124	$ 267,822
Total risk-based capital, actual, ratio	0.1311	0.1268
Total risk-based capital for capital adequacy purposes, amount	$ 166,624	$ 168,967
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	$ 218,694	$ 221,770
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	$ 208,280	$ 211,209
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	$ 249,998	$ 244,506
Tier 1 risk-based capital, actual, ratio	0.1200	0.1158
Tier 1 risk-based capital for capital adequacy purposes, amount	$ 124,968	$ 126,726
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	$ 177,038	$ 179,528
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	$ 166,624	$ 168,967
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio	0.0800	0.0800
Tier 1 leverage, actual, amount	$ 249,998	$ 244,506
Tier 1 leverage, actual, ratio	0.1151	0.1141
Tier 1 leverage for capital adequacy purposes, amount	$ 86,845	$ 85,688
Tier 1 leverage for capital adequacy purposes, ratio	0.0400	0.0400
Tier 1 leverage for capital adequacy purposes with capital conservation buffer, amount	$ 86,845	$ 85,688
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	$ 108,556	$ 107,110
Tier 1 leverage to be well capitalized under prompt corrective action provisions, ratio	0.0500	0.0500
Common equity Tier 1, actual, amount	$ 249,998	$ 244,506
Common equity Tier 1, actual ratio	0.1200	0.1158
Common equity Tier 1 for capital adequacy purposes, amount	$ 93,726	$ 95,044
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	$ 145,796	$ 147,847
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	$ 135,382	$ 137,286
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, ratio	6.50%	6.50%