NOTE 9 - REGULATORY CAPITAL REQUIREMENTS - Capital Requirements (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Total risk-based capital, actual, amount	$ 538,030	$ 460,416
Total risk-based capital, actual, ratio	12.26%	10.69%
Total risk-based capital for capital adequacy purposes, amount, without capital conservation buffer	$ 351,173	$ 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	$ 460,914	$ 425,305
Total risk-based capital for capital adequacy purposes, ratio	10.50%	9.875%
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 438,966	$ 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	$ 433,453	$ 420,569
Tier 1 risk-based capital, actual, ratio	9.87%	9.77%
Tier 1 risk-based capital for capital adequacy purposes, amount, without capital conservation buffer	$ 263,379	$ 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	$ 373,121	$ 339,168
Tier 1 risk-based capital for capital adequacy purposes, ratio	8.50%	7.875%
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 351,173	$ 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	$ 433,453	$ 420,569
Tier 1 leverage, actual, ratio	8.90%	8.87%
Tier 1 leverage for capital adequacy purposes, amount, without capital conservation buffer	$ 194,905	$ 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	$ 194,905	$ 189,858
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	$ 243,632	$ 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	$ 395,740	$ 382,899
Common equity Tier 1, actual ratio	9.02%	8.89%
Common equity Tier 1 for capital adequacy purposes, amount, without capital conservation buffer	$ 197,535	$ 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	$ 307,276	$ 274,564
Common equity Tier 1 for capital adequacy purposes, ratio	7.00%	6.375%
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, amount	$ 295,328	$ 279,948
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, ratio	6.50%	6.50%
Quad City Bank and Trust Company [Member]
Total risk-based capital, actual, amount	$ 166,864	$ 162,009
Total risk-based capital, actual, ratio	11.59%	11.38%
Total risk-based capital for capital adequacy purposes, amount, without capital conservation buffer	$ 115,131	$ 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	$ 151,110	$ 140,596
Total risk-based capital for capital adequacy purposes, ratio	10.50%	9.875%
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 143,914	$ 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	$ 153,375	$ 148,529
Tier 1 risk-based capital, actual, ratio	10.66%	10.43%
Tier 1 risk-based capital for capital adequacy purposes, amount, without capital conservation buffer	$ 86,349	$ 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	$ 122,327	$ 112,121
Tier 1 risk-based capital for capital adequacy purposes, ratio	8.50%	7.875%
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 115,131	$ 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	$ 153,375	$ 148,529
Tier 1 leverage, actual, ratio	9.21%	9.04%
Tier 1 leverage for capital adequacy purposes, amount, without capital conservation buffer	$ 66,621	$ 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	$ 66,621	$ 65,744
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	$ 83,277	$ 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	$ 153,375	$ 148,529
Common equity Tier 1, actual ratio	10.66%	10.43%
Common equity Tier 1 for capital adequacy purposes, amount, without capital conservation buffer	$ 64,761	$ 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	$ 100,740	$ 90,764
Common equity Tier 1 for capital adequacy purposes, ratio	7.00%	6.375%
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, amount	$ 93,544	$ 92,544
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, ratio	6.50%	6.50%
Cedar Rapids Bank and Trust [Member]
Total risk-based capital, actual, amount	$ 152,230	$ 146,292
Total risk-based capital, actual, ratio	11.59%	11.55%
Total risk-based capital for capital adequacy purposes, amount, without capital conservation buffer	$ 105,103	$ 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	$ 137,947	$ 125,054
Total risk-based capital for capital adequacy purposes, ratio	10.50%	9.875%
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 131,379	$ 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	$ 139,406	$ 133,982
Tier 1 risk-based capital, actual, ratio	10.61%	10.58%
Tier 1 risk-based capital for capital adequacy purposes, amount, without capital conservation buffer	$ 78,827	$ 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	$ 111,672	$ 99,727
Tier 1 risk-based capital for capital adequacy purposes, ratio	8.50%	7.875%
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 105,103	$ 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	$ 139,406	$ 133,982
Tier 1 leverage, actual, ratio	10.03%	9.98%
Tier 1 leverage for capital adequacy purposes, amount, without capital conservation buffer	$ 55,617	$ 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	$ 55,617	$ 53,682
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	$ 69,521	$ 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	$ 139,406	$ 133,982
Common equity Tier 1, actual ratio	10.61%	10.58%
Common equity Tier 1 for capital adequacy purposes, amount, without capital conservation buffer	$ 59,120	$ 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	$ 91,965	$ 80,731
Common equity Tier 1 for capital adequacy purposes, ratio	7.00%	6.375%
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, amount	$ 85,396	$ 82,314
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, ratio	6.50%	6.50%
Community State Bank [Member]
Total risk-based capital, actual, amount	$ 82,640	$ 75,233
Total risk-based capital, actual, ratio	12.23%	11.24%
Total risk-based capital for capital adequacy purposes, amount, without capital conservation buffer	$ 54,069	$ 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	$ 70,966	$ 66,122
Total risk-based capital for capital adequacy purposes, ratio	10.50%	9.875%
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 67,587	$ 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	$ 76,329	$ 69,101
Tier 1 risk-based capital, actual, ratio	11.29%	10.32%
Tier 1 risk-based capital for capital adequacy purposes, amount, without capital conservation buffer	$ 40,552	$ 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	$ 57,449	$ 52,730
Tier 1 risk-based capital for capital adequacy purposes, ratio	8.50%	7.875%
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 54,069	$ 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	$ 76,329	$ 69,101
Tier 1 leverage, actual, ratio	9.97%	9.19%
Tier 1 leverage for capital adequacy purposes, amount, without capital conservation buffer	$ 30,630	$ 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	$ 30,630	$ 30,070
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	$ 38,287	$ 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	$ 76,329	$ 69,101
Common equity Tier 1, actual ratio	11.29%	10.32%
Common equity Tier 1 for capital adequacy purposes, amount, without capital conservation buffer	$ 30,414	$ 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	$ 47,311	$ 42,686
Common equity Tier 1 for capital adequacy purposes, ratio	7.00%	6.375%
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, amount	$ 43,931	$ 43,523
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	$ 62,958
Total risk-based capital, actual, ratio	13.04%
Total risk-based capital for capital adequacy purposes, amount, without capital conservation buffer	$ 38,639
Total risk-based capital for capital adequacy purposes, ratio, without capital conservation buffer	8.00%
Total risk-based capital for capital adequacy purposes, amount	$ 50,713
Total risk-based capital for capital adequacy purposes, ratio	10.50%
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 48,298
Total risk-based capital to be well capitalized under prompt corrective action provisions, ratio	10.00%
Tier 1 risk-based capital, actual, amount	$ 56,666
Tier 1 risk-based capital, actual, ratio	11.73%
Tier 1 risk-based capital for capital adequacy purposes, amount, without capital conservation buffer	$ 28,979
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	$ 41,053
Tier 1 risk-based capital for capital adequacy purposes, ratio	8.50%
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 38,639
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio	8.00%
Tier 1 leverage, actual, amount	$ 56,666
Tier 1 leverage, actual, ratio	10.36%
Tier 1 leverage for capital adequacy purposes, amount, without capital conservation buffer	$ 21,883
Tier 1 leverage for capital adequacy purposes, ratio, without capital conservation buffer	4.00%
Tier 1 leverage for capital adequacy purposes, amount	$ 21,883
Tier 1 leverage for capital adequacy purposes, ratio	4.00%
Tier 1 leverage to be well capitalized under prompt corrective action provisions, amount	$ 27,353
Tier 1 leverage to be well capitalized under prompt corrective action provisions, ratio	5.00%
Common equity Tier 1, actual, amount	$ 56,666
Common equity Tier 1, actual ratio	11.73%
Common equity Tier 1 for capital adequacy purposes, amount, without capital conservation buffer	$ 21,734
Common equity Tier 1 for capital adequacy purposes, ratio, without capital conservation buffer	4.50%
Common equity Tier 1 for capital adequacy purposes, amount	$ 33,809
Common equity Tier 1 for capital adequacy purposes, ratio	7.00%
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, amount	$ 31,394
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, ratio	6.50%
SPRINGFIELD BANCSHARES, INC
Total risk-based capital, actual, amount	$ 51,286	$ 50,648
Total risk-based capital, actual, ratio	10.93%	10.89%
Total risk-based capital for capital adequacy purposes, amount, without capital conservation buffer	$ 37,530	$ 37,208
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	$ 49,259	$ 45,929
Total risk-based capital for capital adequacy purposes, ratio	10.50%	9.875%
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 46,913	$ 46,511
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	$ 45,408	$ 44,821
Tier 1 risk-based capital, actual, ratio	9.68%	9.64%
Tier 1 risk-based capital for capital adequacy purposes, amount, without capital conservation buffer	$ 28,148	$ 27,906
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	$ 39,876	$ 36,627
Tier 1 risk-based capital for capital adequacy purposes, ratio	8.50%	7.875%
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 37,530	$ 37,208
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio	8.00%	8.00%
Tier 1 leverage, actual, amount	$ 45,408	$ 44,821
Tier 1 leverage, actual, ratio	8.84%	8.93%
Tier 1 leverage for capital adequacy purposes, amount, without capital conservation buffer	$ 20,544	$ 20,081
Tier 1 leverage for capital adequacy purposes, ratio, without capital conservation buffer	4.00%	4.00%
Tier 1 leverage for capital adequacy purposes, amount	$ 20,544	$ 20,081
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	$ 25,681	$ 25,101
Tier 1 leverage to be well capitalized under prompt corrective action provisions, ratio	5.00%	5.00%
Common equity Tier 1, actual, amount	$ 45,408	$ 44,821
Common equity Tier 1, actual ratio	9.68%	9.64%
Common equity Tier 1 for capital adequacy purposes, amount, without capital conservation buffer	$ 21,111	$ 20,930
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	$ 32,839	$ 29,650
Common equity Tier 1 for capital adequacy purposes, ratio	7.00%	6.375%
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, amount	$ 30,494	$ 30,232
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		$ 57,051
Total risk-based capital, actual, ratio		12.24%
Total risk-based capital for capital adequacy purposes, amount, without capital conservation buffer		$ 37,278
Total risk-based capital for capital adequacy purposes, ratio, without capital conservation buffer		8.00%
Total risk-based capital for capital adequacy purposes, amount		$ 46,016
Total risk-based capital for capital adequacy purposes, ratio		9.875%
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount		$ 46,598
Total risk-based capital to be well capitalized under prompt corrective action provisions, ratio		10.00%
Tier 1 risk-based capital, actual, amount		$ 51,279
Tier 1 risk-based capital, actual, ratio		11.00%
Tier 1 risk-based capital for capital adequacy purposes, amount, without capital conservation buffer		$ 27,959
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		$ 36,696
Tier 1 risk-based capital for capital adequacy purposes, ratio		7.875%
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount		$ 37,278
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio		8.00%
Tier 1 leverage, actual, amount		$ 51,279
Tier 1 leverage, actual, ratio		9.39%
Tier 1 leverage for capital adequacy purposes, amount, without capital conservation buffer		$ 21,849
Tier 1 leverage for capital adequacy purposes, ratio, without capital conservation buffer		4.00%
Tier 1 leverage for capital adequacy purposes, amount		$ 21,849
Tier 1 leverage for capital adequacy purposes, ratio		4.00%
Tier 1 leverage to be well capitalized under prompt corrective action provisions, amount		$ 27,312
Tier 1 leverage to be well capitalized under prompt corrective action provisions, ratio		5.00%
Common equity Tier 1, actual, amount		$ 51,279
Common equity Tier 1, actual ratio		11.00%
Common equity Tier 1 for capital adequacy purposes, amount, without capital conservation buffer		$ 20,969
Common equity Tier 1 for capital adequacy purposes, ratio, without capital conservation buffer		4.50%
Common equity Tier 1 for capital adequacy purposes, amount		$ 29,706
Common equity Tier 1 for capital adequacy purposes, ratio		6.375%
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, amount		$ 30,289
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, ratio		6.50%