REGULATORY CAPITAL REQUIREMENTS AND RESTRICTIONS ON SUBSIDIARY DIVIDENDS (Details) $ in Thousands	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Total Capital (to Risk-Weighted Assets)
Actual - Amount	$ 1,739,048	$ 1,388,511
Actual - Ratio	0.1471	0.1375
For Capital Adequacy Purposes - Amount	$ 945,523	$ 807,881
For Capital Adequacy Purposes - Ratio	0.0800	0.0800
Tier 1 Capital (to Risk-Weighted Assets)
Actual - Amount	$ 1,401,131	$ 1,243,582
Actual - Ratio	0.1185	0.1231
For Capital Adequacy Purposes - Amount	$ 709,142	$ 605,911
For Capital Adequacy Purposes - Ratio	0.0600	0.0600
Common Equity Tier 1 (to Risk-Weighted Assets)
Actual - Amount	$ 1,290,426	$ 1,098,428
Actual - Ratio	10.92%	10.88%
For Capital Adequacy Purposes - Amount	$ 531,857	$ 454,433
For Capital Adequacy Purposes - Ratio	4.50%	4.50%
Tier 1 Capital (to Average Assets)
Actual - Amount	$ 1,401,131	$ 1,243,582
Actual - Ratio	0.0902	0.1010
For Capital Adequacy Purposes - Amount	$ 621,275	$ 492,725
For Capital Adequacy Purposes - Ratio	0.0400	0.0400
Minimum Capital Requirement
Tier 1 Capital (to Average Assets)
Retained earnings available for dividend payments	$ 736,500
Capital Requirement to Remain Well Capitalized
Tier 1 Capital (to Average Assets)
Retained earnings available for dividend payments	500,900
Dubuque Bank and Trust Company
Total Capital (to Risk-Weighted Assets)
Actual - Amount	$ 177,782	$ 168,959
Actual - Ratio	0.1394	0.1455
For Capital Adequacy Purposes - Amount	$ 102,018	$ 92,872
For Capital Adequacy Purposes - Ratio	0.0800	0.0800
To Be Well Capitalized Under Prompt Corrective Action - Amount	$ 127,523	$ 116,090
To Be Well Capitalized Under Prompt Corrective Action - Ratio	0.1000	0.1000
Tier 1 Capital (to Risk-Weighted Assets)
Actual - Amount	$ 164,316	$ 159,579
Actual - Ratio	0.1289	0.1375
For Capital Adequacy Purposes - Amount	$ 76,514	$ 69,654
For Capital Adequacy Purposes - Ratio	0.0600	0.0600
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount	$ 102,018	$ 92,872
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio	0.0800	0.0800
Common Equity Tier 1 (to Risk-Weighted Assets)
Actual - Amount	$ 164,316	$ 159,579
Actual - Ratio	12.89%	13.75%
For Capital Adequacy Purposes - Amount	$ 57,385	$ 52,241
For Capital Adequacy Purposes - Ratio	4.50%	4.50%
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount	$ 82,890	$ 75,459
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio	6.50%	6.50%
Tier 1 Capital (to Average Assets)
Actual - Amount	$ 164,316	$ 159,579
Actual - Ratio	0.0852	0.0983
For Capital Adequacy Purposes - Amount	$ 77,150	$ 64,961
For Capital Adequacy Purposes - Ratio	0.0400	0.0400
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount	$ 96,437	$ 81,202
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio	0.0500	0.0500
Illinois Bank & Trust
Total Capital (to Risk-Weighted Assets)
Actual - Amount	$ 133,674	$ 107,678
Actual - Ratio	0.1313	0.1054
For Capital Adequacy Purposes - Amount	$ 81,432	$ 81,731
For Capital Adequacy Purposes - Ratio	0.0800	0.0800
To Be Well Capitalized Under Prompt Corrective Action - Amount	$ 101,790	$ 102,164
To Be Well Capitalized Under Prompt Corrective Action - Ratio	0.1000	0.1000
Tier 1 Capital (to Risk-Weighted Assets)
Actual - Amount	$ 121,513	$ 103,011
Actual - Ratio	0.1194	0.1008
For Capital Adequacy Purposes - Amount	$ 61,074	$ 61,298
For Capital Adequacy Purposes - Ratio	0.0600	0.0600
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount	$ 81,432	$ 81,731
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio	0.0800	0.0800
Common Equity Tier 1 (to Risk-Weighted Assets)
Actual - Amount	$ 121,513	$ 103,011
Actual - Ratio	11.94%	10.08%
For Capital Adequacy Purposes - Amount	$ 45,806	$ 45,974
For Capital Adequacy Purposes - Ratio	4.50%	4.50%
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount	$ 66,164	$ 66,407
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio	6.50%	6.50%
Tier 1 Capital (to Average Assets)
Actual - Amount	$ 121,513	$ 103,011
Actual - Ratio	0.0822	0.1026
For Capital Adequacy Purposes - Amount	$ 59,129	$ 40,144
For Capital Adequacy Purposes - Ratio	0.0400	0.0400
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount	$ 73,912	$ 50,180
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio	0.0500	0.0500
Wisconsin Bank & Trust
Total Capital (to Risk-Weighted Assets)
Actual - Amount	$ 121,899	$ 117,355
Actual - Ratio	0.1435	0.1413
For Capital Adequacy Purposes - Amount	$ 67,956	$ 66,431
For Capital Adequacy Purposes - Ratio	0.0800	0.0800
To Be Well Capitalized Under Prompt Corrective Action - Amount	$ 84,945	$ 83,039
To Be Well Capitalized Under Prompt Corrective Action - Ratio	0.1000	0.1000
Tier 1 Capital (to Risk-Weighted Assets)
Actual - Amount	$ 111,985	$ 109,939
Actual - Ratio	0.1318	0.1324
For Capital Adequacy Purposes - Amount	$ 50,967	$ 49,824
For Capital Adequacy Purposes - Ratio	0.0600	0.0600
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount	$ 67,956	$ 66,431
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio	0.0800	0.0800
Common Equity Tier 1 (to Risk-Weighted Assets)
Actual - Amount	$ 111,985	$ 109,939
Actual - Ratio	13.18%	13.24%
For Capital Adequacy Purposes - Amount	$ 38,225	$ 37,368
For Capital Adequacy Purposes - Ratio	4.50%	4.50%
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount	$ 55,214	$ 53,976
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio	6.50%	6.50%
Tier 1 Capital (to Average Assets)
Actual - Amount	$ 111,985	$ 109,939
Actual - Ratio	0.0967	0.1076
For Capital Adequacy Purposes - Amount	$ 46,337	$ 40,863
For Capital Adequacy Purposes - Ratio	0.0400	0.0400
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount	$ 57,921	$ 51,078
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio	0.0500	0.0500
New Mexico Bank & Trust
Total Capital (to Risk-Weighted Assets)
Actual - Amount	$ 177,708	$ 157,555
Actual - Ratio	0.1340	0.1233
For Capital Adequacy Purposes - Amount	$ 106,120	$ 102,193
For Capital Adequacy Purposes - Ratio	0.0800	0.0800
To Be Well Capitalized Under Prompt Corrective Action - Amount	$ 132,649	$ 127,741
To Be Well Capitalized Under Prompt Corrective Action - Ratio	0.1000	0.1000
Tier 1 Capital (to Risk-Weighted Assets)
Actual - Amount	$ 161,750	$ 148,227
Actual - Ratio	0.1219	0.1160
For Capital Adequacy Purposes - Amount	$ 79,590	$ 76,645
For Capital Adequacy Purposes - Ratio	0.0600	0.0600
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount	$ 106,120	$ 102,193
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio	0.0800	0.0800
Common Equity Tier 1 (to Risk-Weighted Assets)
Actual - Amount	$ 161,750	$ 148,227
Actual - Ratio	12.19%	11.60%
For Capital Adequacy Purposes - Amount	$ 59,692	$ 57,484
For Capital Adequacy Purposes - Ratio	4.50%	4.50%
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount	$ 86,222	$ 83,032
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio	6.50%	6.50%
Tier 1 Capital (to Average Assets)
Actual - Amount	$ 161,750	$ 148,227
Actual - Ratio	0.0811	0.0911
For Capital Adequacy Purposes - Amount	$ 79,764	$ 65,076
For Capital Adequacy Purposes - Ratio	0.0400	0.0400
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount	$ 99,705	$ 81,345
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio	0.0500	0.0500
Arizona Bank & Trust
Total Capital (to Risk-Weighted Assets)
Actual - Amount	$ 112,589	$ 75,498
Actual - Ratio	0.1216	0.1119
For Capital Adequacy Purposes - Amount	$ 74,056	$ 53,982
For Capital Adequacy Purposes - Ratio	0.0800	0.0800
To Be Well Capitalized Under Prompt Corrective Action - Amount	$ 92,571	$ 67,477
To Be Well Capitalized Under Prompt Corrective Action - Ratio	0.1000	0.1000
Tier 1 Capital (to Risk-Weighted Assets)
Actual - Amount	$ 102,882	$ 69,648
Actual - Ratio	0.1111	0.1032
For Capital Adequacy Purposes - Amount	$ 55,542	$ 40,486
For Capital Adequacy Purposes - Ratio	0.0600	0.0600
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount	$ 74,056	$ 53,982
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio	0.0800	0.0800
Common Equity Tier 1 (to Risk-Weighted Assets)
Actual - Amount	$ 102,882	$ 69,648
Actual - Ratio	11.11%	10.32%
For Capital Adequacy Purposes - Amount	$ 41,657	$ 30,365
For Capital Adequacy Purposes - Ratio	4.50%	4.50%
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount	$ 60,171	$ 43,860
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio	6.50%	6.50%
Tier 1 Capital (to Average Assets)
Actual - Amount	$ 102,882	$ 69,648
Actual - Ratio	0.0909	0.0987
For Capital Adequacy Purposes - Amount	$ 45,295	$ 28,235
For Capital Adequacy Purposes - Ratio	0.0400	0.0400
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount	$ 56,619	$ 35,293
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio	0.0500	0.0500
Rocky Mountain Bank
Total Capital (to Risk-Weighted Assets)
Actual - Amount	$ 56,872	$ 53,266
Actual - Ratio	0.1349	0.1380
For Capital Adequacy Purposes - Amount	$ 33,732	$ 30,868
For Capital Adequacy Purposes - Ratio	0.0800	0.0800
To Be Well Capitalized Under Prompt Corrective Action - Amount	$ 42,166	$ 38,585
To Be Well Capitalized Under Prompt Corrective Action - Ratio	0.1000	0.1000
Tier 1 Capital (to Risk-Weighted Assets)
Actual - Amount	$ 51,597	$ 48,692
Actual - Ratio	0.1224	0.1262
For Capital Adequacy Purposes - Amount	$ 25,299	$ 23,151
For Capital Adequacy Purposes - Ratio	0.0600	0.0600
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount	$ 33,732	$ 30,868
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio	0.0800	0.0800
Common Equity Tier 1 (to Risk-Weighted Assets)
Actual - Amount	$ 51,597	$ 48,692
Actual - Ratio	12.24%	12.62%
For Capital Adequacy Purposes - Amount	$ 18,974	$ 17,363
For Capital Adequacy Purposes - Ratio	4.50%	4.50%
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount	$ 27,408	$ 25,080
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio	6.50%	6.50%
Tier 1 Capital (to Average Assets)
Actual - Amount	$ 51,597	$ 48,692
Actual - Ratio	0.0841	0.0922
For Capital Adequacy Purposes - Amount	$ 24,552	$ 21,132
For Capital Adequacy Purposes - Ratio	0.0400	0.0400
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount	$ 30,690	$ 26,415
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio	0.0500	0.0500
Citywide Banks
Total Capital (to Risk-Weighted Assets)
Actual - Amount	$ 258,419	$ 240,735
Actual - Ratio	0.1530	0.1388
For Capital Adequacy Purposes - Amount	$ 135,097	$ 138,704
For Capital Adequacy Purposes - Ratio	0.0800	0.0800
To Be Well Capitalized Under Prompt Corrective Action - Amount	$ 168,871	$ 173,380
To Be Well Capitalized Under Prompt Corrective Action - Ratio	0.1000	0.1000
Tier 1 Capital (to Risk-Weighted Assets)
Actual - Amount	$ 237,295	$ 231,085
Actual - Ratio	0.1405	0.1333
For Capital Adequacy Purposes - Amount	$ 101,323	$ 104,028
For Capital Adequacy Purposes - Ratio	0.0600	0.0600
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount	$ 135,097	$ 138,704
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio	0.0800	0.0800
Common Equity Tier 1 (to Risk-Weighted Assets)
Actual - Amount	$ 237,295	$ 231,085
Actual - Ratio	14.05%	13.33%
For Capital Adequacy Purposes - Amount	$ 75,992	$ 78,021
For Capital Adequacy Purposes - Ratio	4.50%	4.50%
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount	$ 109,766	$ 112,697
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio	6.50%	6.50%
Tier 1 Capital (to Average Assets)
Actual - Amount	$ 237,295	$ 231,085
Actual - Ratio	0.0967	0.1066
For Capital Adequacy Purposes - Amount	$ 98,182	$ 86,732
For Capital Adequacy Purposes - Ratio	0.0400	0.0400
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount	$ 122,728	$ 108,416
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio	0.0500	0.0500
Minnesota Bank & Trust
Total Capital (to Risk-Weighted Assets)
Actual - Amount	$ 85,566	$ 76,400
Actual - Ratio	0.1311	0.1350
For Capital Adequacy Purposes - Amount	$ 52,206	$ 45,260
For Capital Adequacy Purposes - Ratio	0.0800	0.0800
To Be Well Capitalized Under Prompt Corrective Action - Amount	$ 65,258	$ 56,575
To Be Well Capitalized Under Prompt Corrective Action - Ratio	0.1000	0.1000
Tier 1 Capital (to Risk-Weighted Assets)
Actual - Amount	$ 78,661	$ 70,235
Actual - Ratio	0.1205	0.1241
For Capital Adequacy Purposes - Amount	$ 39,155	$ 33,945
For Capital Adequacy Purposes - Ratio	0.0600	0.0600
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount	$ 52,206	$ 45,260
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio	0.0800	0.0800
Common Equity Tier 1 (to Risk-Weighted Assets)
Actual - Amount	$ 78,661	$ 70,235
Actual - Ratio	12.05%	12.41%
For Capital Adequacy Purposes - Amount	$ 29,366	$ 25,459
For Capital Adequacy Purposes - Ratio	4.50%	4.50%
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount	$ 42,418	$ 36,774
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio	6.50%	6.50%
Tier 1 Capital (to Average Assets)
Actual - Amount	$ 78,661	$ 70,235
Actual - Ratio	0.0868	0.1051
For Capital Adequacy Purposes - Amount	$ 36,251	$ 26,740
For Capital Adequacy Purposes - Ratio	0.0400	0.0400
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount	$ 45,313	$ 33,426
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio	0.0500
Bank of Blue Valley
Total Capital (to Risk-Weighted Assets)
Actual - Amount	$ 157,093	$ 145,256
Actual - Ratio	0.1740	0.1450
For Capital Adequacy Purposes - Amount	$ 72,240	$ 80,153
For Capital Adequacy Purposes - Ratio	0.0800	0.0800
To Be Well Capitalized Under Prompt Corrective Action - Amount	$ 90,300	$ 100,191
To Be Well Capitalized Under Prompt Corrective Action - Ratio	0.1000	0.1000
Tier 1 Capital (to Risk-Weighted Assets)
Actual - Amount	$ 145,795	$ 140,195
Actual - Ratio	0.1615	0.1399
For Capital Adequacy Purposes - Amount	$ 54,180	$ 60,115
For Capital Adequacy Purposes - Ratio	0.0600	0.0600
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount	$ 72,240	$ 80,153
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio	0.0800	0.0800
Common Equity Tier 1 (to Risk-Weighted Assets)
Actual - Amount	$ 145,795	$ 140,195
Actual - Ratio	16.15%	13.99%
For Capital Adequacy Purposes - Amount	$ 40,635	$ 45,086
For Capital Adequacy Purposes - Ratio	4.50%	4.50%
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount	$ 58,695	$ 65,124
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio	6.50%	6.50%
Tier 1 Capital (to Average Assets)
Actual - Amount	$ 145,795	$ 140,195
Actual - Ratio	0.1093	0.1107
For Capital Adequacy Purposes - Amount	$ 53,343	$ 50,638
For Capital Adequacy Purposes - Ratio	0.0400	0.0400
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount	$ 66,679	$ 63,297
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio	0.0500	0.0500
Premier Valley Bank
Total Capital (to Risk-Weighted Assets)
Actual - Amount	$ 93,032	$ 91,257
Actual - Ratio	0.1262	0.1321
For Capital Adequacy Purposes - Amount	$ 58,968	$ 55,273
For Capital Adequacy Purposes - Ratio	0.0800	0.0800
To Be Well Capitalized Under Prompt Corrective Action - Amount	$ 73,710	$ 69,091
To Be Well Capitalized Under Prompt Corrective Action - Ratio	0.1000	0.1000
Tier 1 Capital (to Risk-Weighted Assets)
Actual - Amount	$ 85,456	$ 87,335
Actual - Ratio	0.1159	0.1264
For Capital Adequacy Purposes - Amount	$ 44,226	$ 41,455
For Capital Adequacy Purposes - Ratio	0.0600	0.0600
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount	$ 58,968	$ 55,273
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio	0.0800	0.0800
Common Equity Tier 1 (to Risk-Weighted Assets)
Actual - Amount	$ 85,456	$ 87,335
Actual - Ratio	11.59%	12.64%
For Capital Adequacy Purposes - Amount	$ 33,170	$ 31,091
For Capital Adequacy Purposes - Ratio	4.50%	4.50%
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount	$ 47,912	$ 44,909
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio	6.50%	6.50%
Tier 1 Capital (to Average Assets)
Actual - Amount	$ 85,456	$ 87,335
Actual - Ratio	0.0857	0.1043
For Capital Adequacy Purposes - Amount	$ 39,893	$ 33,487
For Capital Adequacy Purposes - Ratio	0.0400	0.0400
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount	$ 49,866	$ 41,859
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio	0.0500	0.0500
First Bank & Trust
Total Capital (to Risk-Weighted Assets)
Actual - Amount	$ 304,397	$ 109,545
Actual - Ratio	0.1534	0.1411
For Capital Adequacy Purposes - Amount	$ 158,705	$ 62,128
For Capital Adequacy Purposes - Ratio	0.0800	0.0800
To Be Well Capitalized Under Prompt Corrective Action - Amount	$ 198,381	$ 77,660
To Be Well Capitalized Under Prompt Corrective Action - Ratio	0.1000	0.1000
Tier 1 Capital (to Risk-Weighted Assets)
Actual - Amount	$ 279,521	$ 104,914
Actual - Ratio	0.1409	0.1351
For Capital Adequacy Purposes - Amount	$ 119,029	$ 46,596
For Capital Adequacy Purposes - Ratio	0.0600	0.0600
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount	$ 158,705	$ 62,128
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio	0.0800	0.0800
Common Equity Tier 1 (to Risk-Weighted Assets)
Actual - Amount	$ 279,521	$ 104,914
Actual - Ratio	14.09%	13.51%
For Capital Adequacy Purposes - Amount	$ 89,271	$ 34,947
For Capital Adequacy Purposes - Ratio	4.50%	4.50%
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount	$ 128,948	$ 50,479
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio	6.50%	6.50%
Tier 1 Capital (to Average Assets)
Actual - Amount	$ 279,521	$ 104,914
Actual - Ratio	0.1763	0.1025
For Capital Adequacy Purposes - Amount	$ 63,407	$ 40,941
For Capital Adequacy Purposes - Ratio	0.0400	0.0400
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount	$ 79,259	$ 51,177
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio	0.0500	0.0500