Note 17 - Regulatory Capital Requirements and Restrictions on Dividends - Capital Requirements (Details) - USD ($) $ in Thousands		Dec. 31, 2019	Dec. 31, 2018
Total risk-based capital, actual, amount		$ 581,234	$ 460,416
Total risk-based capital, actual, ratio		13.33%	10.69%
Total risk-based capital for capital adequacy purposes, amount, without capital conservation buffer		$ 348,937	$ 344,551
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		$ 457,980	$ 425,305
Total risk-based capital for capital adequacy purposes, ratio	[1]	10.50%	9.875%
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount	[1]	$ 436,171	$ 430,689
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		$ 481,702	$ 420,569
Tier 1 risk-based capital, actual, ratio		11.04%	9.77%
Tier 1 risk-based capital for capital adequacy purposes, amount, without capital conservation buffer		$ 261,703	$ 258,413
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		$ 370,746	$ 339,168
Tier 1 risk-based capital for capital adequacy purposes, ratio	[1]	8.50%	7.875%
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount	[1]	$ 348,937	$ 344,551
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio		8.00%	8.00%
Tier 1 leverage, actual, amount		$ 481,702	$ 420,569
Tier 1 leverage, actual, ratio		9.53%	8.87%
Tier 1 leverage for capital adequacy purposes, amount, without capital conservation buffer		$ 202,207	$ 189,858
Tier 1 leverage for capital adequacy purposes, ratio, without capital conservation buffer		4.00%	4.00%
Tier 1 leverage for capital adequacy purposes, amount		$ 202,207	$ 189,858
Tier 1 leverage for capital adequacy purposes, ratio	[1]	4.00%	4.00%
Tier 1 leverage to be well capitalized under prompt corrective action provisions, amount	[1]	$ 252,758	$ 237,322
Tier 1 leverage to be well capitalized under prompt corrective action provisions, ratio		5.00%	5.00%
Common equity Tier 1, actual, amount		$ 443,864	$ 382,899
Common equity Tier 1, actual ratio		10.18%	8.89%
Common equity Tier 1 for capital adequacy purposes, amount, without capital conservation buffer		$ 196,277	$ 193,810
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		$ 305,320	$ 274,564
Common equity Tier 1 for capital adequacy purposes, ratio	[1]	7.00%	6.375%
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, amount	[1]	$ 283,511	$ 279,948
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		$ 183,855	$ 162,009
Total risk-based capital, actual, ratio		11.83%	11.38%
Total risk-based capital for capital adequacy purposes, amount, without capital conservation buffer		$ 124,362	$ 113,900
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		$ 163,225	$ 140,596
Total risk-based capital for capital adequacy purposes, ratio	[1]	10.50%	9.875%
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount	[1]	$ 155,452	$ 142,376
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		$ 170,137	$ 148,529
Tier 1 risk-based capital, actual, ratio		10.94%	10.43%
Tier 1 risk-based capital for capital adequacy purposes, amount, without capital conservation buffer		$ 93,271	$ 85,425
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		$ 132,134	$ 112,121
Tier 1 risk-based capital for capital adequacy purposes, ratio	[1]	8.50%	7.875%
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount	[1]	$ 124,362	$ 113,900
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio		8.00%	8.00%
Tier 1 leverage, actual, amount		$ 170,137	$ 148,529
Tier 1 leverage, actual, ratio		9.94%	9.04%
Tier 1 leverage for capital adequacy purposes, amount, without capital conservation buffer		$ 68,479	$ 65,744
Tier 1 leverage for capital adequacy purposes, ratio, without capital conservation buffer		4.00%	4.00%
Tier 1 leverage for capital adequacy purposes, amount		$ 68,479	$ 65,744
Tier 1 leverage for capital adequacy purposes, ratio	[1]	4.00%	4.00%
Tier 1 leverage to be well capitalized under prompt corrective action provisions, amount	[1]	$ 85,598	$ 82,180
Tier 1 leverage to be well capitalized under prompt corrective action provisions, ratio		5.00%	5.00%
Common equity Tier 1, actual, amount		$ 170,137	$ 148,529
Common equity Tier 1, actual ratio		10.94%	10.43%
Common equity Tier 1 for capital adequacy purposes, amount, without capital conservation buffer		$ 69,953	$ 64,069
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		$ 108,817	$ 90,764
Common equity Tier 1 for capital adequacy purposes, ratio	[1]	7.00%	6.375%
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, amount	[1]	$ 101,044	$ 92,544
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		$ 175,498	$ 146,292
Total risk-based capital, actual, ratio		11.90%	11.55%
Total risk-based capital for capital adequacy purposes, amount, without capital conservation buffer		$ 117,953	$ 101,310
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		$ 154,813	$ 125,054
Total risk-based capital for capital adequacy purposes, ratio	[1]	10.50%	9.875%
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount	[1]	$ 147,441	$ 126,637
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		$ 162,127	$ 133,982
Tier 1 risk-based capital, actual, ratio		11.00%	10.58%
Tier 1 risk-based capital for capital adequacy purposes, amount, without capital conservation buffer		$ 88,465	$ 75,982
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		$ 125,325	$ 99,727
Tier 1 risk-based capital for capital adequacy purposes, ratio	[1]	8.50%	7.875%
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount	[1]	$ 117,953	$ 101,310
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio		8.00%	8.00%
Tier 1 leverage, actual, amount		$ 162,127	$ 133,982
Tier 1 leverage, actual, ratio		10.41%	9.98%
Tier 1 leverage for capital adequacy purposes, amount, without capital conservation buffer		$ 62,286	$ 53,682
Tier 1 leverage for capital adequacy purposes, ratio, without capital conservation buffer		4.00%	4.00%
Tier 1 leverage for capital adequacy purposes, amount		$ 62,286	$ 53,682
Tier 1 leverage for capital adequacy purposes, ratio	[1]	4.00%	4.00%
Tier 1 leverage to be well capitalized under prompt corrective action provisions, amount	[1]	$ 77,857	$ 67,103
Tier 1 leverage to be well capitalized under prompt corrective action provisions, ratio		5.00%	5.00%
Common equity Tier 1, actual, amount		$ 162,127	$ 133,982
Common equity Tier 1, actual ratio		11.00%	10.58%
Common equity Tier 1 for capital adequacy purposes, amount, without capital conservation buffer		$ 66,349	$ 56,987
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		$ 103,209	$ 80,731
Common equity Tier 1 for capital adequacy purposes, ratio	[1]	7.00%	6.375%
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, amount	[1]	$ 95,837	$ 82,314
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		$ 92,095	$ 75,233
Total risk-based capital, actual, ratio		12.32%	11.24%
Total risk-based capital for capital adequacy purposes, amount, without capital conservation buffer		$ 59,813	$ 53,567
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		$ 78,504	$ 66,122
Total risk-based capital for capital adequacy purposes, ratio	[1]	10.50%	9.875%
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount	[1]	$ 74,766	$ 66,959
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		$ 85,437	$ 69,101
Tier 1 risk-based capital, actual, ratio		11.43%	10.32%
Tier 1 risk-based capital for capital adequacy purposes, amount, without capital conservation buffer		$ 44,860	$ 40,175
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		$ 63,551	$ 52,730
Tier 1 risk-based capital for capital adequacy purposes, ratio	[1]	8.50%	7.875%
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount	[1]	$ 59,813	$ 53,567
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio		8.00%	8.00%
Tier 1 leverage, actual, amount		$ 85,437	$ 69,101
Tier 1 leverage, actual, ratio		10.39%	9.19%
Tier 1 leverage for capital adequacy purposes, amount, without capital conservation buffer		$ 32,902	$ 30,070
Tier 1 leverage for capital adequacy purposes, ratio, without capital conservation buffer		4.00%	4.00%
Tier 1 leverage for capital adequacy purposes, amount		$ 32,902	$ 30,070
Tier 1 leverage for capital adequacy purposes, ratio	[1]	4.00%	4.00%
Tier 1 leverage to be well capitalized under prompt corrective action provisions, amount	[1]	$ 41,128	$ 37,588
Tier 1 leverage to be well capitalized under prompt corrective action provisions, ratio		5.00%	5.00%
Common equity Tier 1, actual, amount		$ 85,437	$ 69,101
Common equity Tier 1, actual ratio		11.43%	10.32%
Common equity Tier 1 for capital adequacy purposes, amount, without capital conservation buffer		$ 33,645	$ 30,131
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		$ 52,336	$ 42,686
Common equity Tier 1 for capital adequacy purposes, ratio	[1]	7.00%	6.375%
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, amount	[1]	$ 48,598	$ 43,523
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, ratio		6.50%	6.50%
Springfield First Community Bank [Member]
Total risk-based capital, actual, amount		$ 71,074	$ 57,051
Total risk-based capital, actual, ratio		12.72%	12.24%
Total risk-based capital for capital adequacy purposes, amount, without capital conservation buffer		$ 44,704	$ 37,278
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		$ 58,674	$ 46,016
Total risk-based capital for capital adequacy purposes, ratio	[1]	10.50%	9.875%
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount	[1]	$ 55,880	$ 46,598
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		$ 63,956	$ 51,279
Tier 1 risk-based capital, actual, ratio		11.45%	11.00%
Tier 1 risk-based capital for capital adequacy purposes, amount, without capital conservation buffer		$ 33,528	$ 27,959
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		$ 47,498	$ 36,696
Tier 1 risk-based capital for capital adequacy purposes, ratio	[1]	8.50%	7.875%
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount	[1]	$ 44,704	$ 37,278
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio		8.00%	8.00%
Tier 1 leverage, actual, amount		$ 63,956	$ 51,279
Tier 1 leverage, actual, ratio		9.70%	9.39%
Tier 1 leverage for capital adequacy purposes, amount, without capital conservation buffer		$ 26,379	$ 21,849
Tier 1 leverage for capital adequacy purposes, ratio, without capital conservation buffer		4.00%	4.00%
Tier 1 leverage for capital adequacy purposes, amount		$ 26,379	$ 21,849
Tier 1 leverage for capital adequacy purposes, ratio	[1]	4.00%	4.00%
Tier 1 leverage to be well capitalized under prompt corrective action provisions, amount	[1]	$ 32,974	$ 27,312
Tier 1 leverage to be well capitalized under prompt corrective action provisions, ratio		5.00%	5.00%
Common equity Tier 1, actual, amount		$ 63,956	$ 51,279
Common equity Tier 1, actual ratio		11.45%	11.00%
Common equity Tier 1 for capital adequacy purposes, amount, without capital conservation buffer		$ 25,146	$ 20,969
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		$ 39,116	$ 29,706
Common equity Tier 1 for capital adequacy purposes, ratio	[1]	7.00%	6.375%
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, amount	[1]	$ 36,322	$ 30,289
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, ratio		6.50%	6.50%
Rockford Bank and Trust [Member]
Total risk-based capital, actual, amount			$ 50,648
Total risk-based capital, actual, ratio			10.89%
Total risk-based capital for capital adequacy purposes, amount, without capital conservation buffer			$ 37,208
Total risk-based capital for capital adequacy purposes, ratio, without capital conservation buffer			8.00%
Total risk-based capital for capital adequacy purposes, amount			$ 45,929
Total risk-based capital for capital adequacy purposes, ratio	[1]		9.875%
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount	[1]		$ 46,511
Total risk-based capital to be well capitalized under prompt corrective action provisions, ratio			10.00%
Tier 1 risk-based capital, actual, amount			$ 44,821
Tier 1 risk-based capital, actual, ratio			9.64%
Tier 1 risk-based capital for capital adequacy purposes, amount, without capital conservation buffer			$ 27,906
Tier 1 risk-based capital for capital adequacy purposes, ratio, without capital conservation buffer			6.00%
Tier 1 risk-based capital for capital adequacy purposes, amount			$ 36,627
Tier 1 risk-based capital for capital adequacy purposes, ratio	[1]		7.875%
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount	[1]		$ 37,208
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio			8.00%
Tier 1 leverage, actual, amount			$ 44,821
Tier 1 leverage, actual, ratio			8.93%
Tier 1 leverage for capital adequacy purposes, amount, without capital conservation buffer			$ 20,081
Tier 1 leverage for capital adequacy purposes, ratio, without capital conservation buffer			4.00%
Tier 1 leverage for capital adequacy purposes, amount			$ 20,081
Tier 1 leverage for capital adequacy purposes, ratio	[1]		4.00%
Tier 1 leverage to be well capitalized under prompt corrective action provisions, amount	[1]		$ 25,101
Tier 1 leverage to be well capitalized under prompt corrective action provisions, ratio			5.00%
Common equity Tier 1, actual, amount			$ 44,821
Common equity Tier 1, actual ratio			9.64%
Common equity Tier 1 for capital adequacy purposes, amount, without capital conservation buffer			$ 20,930
Common equity Tier 1 for capital adequacy purposes, ratio, without capital conservation buffer			4.50%
Common equity Tier 1 for capital adequacy purposes, amount			$ 29,650
Common equity Tier 1 for capital adequacy purposes, ratio	[1]		6.375%
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, amount	[1]		$ 30,232
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, ratio			6.50%

[1] December 31, 2019 minimums reflect the fully phased-in ratios (including the capital conservation buffer).