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Regulatory Capital Requirements and Restrictions on Subsidiary Dividends (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Total Capital (to Risk-Weighted Assets)    
Actual - Amount $ 1,010,116 $ 887,607
Actual - Ratio 13.45% 14.01%
For Capital Adequacy Purposes - Amount $ 600,924 $ 506,865
For Capital Adequacy Purposes - Ratio 8.00% 8.00%
Tier 1 Capital (to Risk-Weighted Assets)    
Actual - Amount $ 879,133 $ 756,056
Actual - Ratio 11.70% 11.93%
For Capital Adequacy Purposes - Amount $ 450,693 $ 380,148
For Capital Adequacy Purposes - Ratio 6.00% 6.00%
Common Equity Tier 1 (to Risk-Weighted Assets)    
Actual - Amount $ 756,309 $ 639,467
Actual - Ratio 10.07% 10.09%
For Capital Adequacy Purposes - Amount $ 338,019 $ 285,111
For Capital Adequacy Purposes - Ratio 4.50% 4.50%
Tier 1 Capital (to Average Assets)    
Actual - Amount $ 879,133 $ 756,056
Actual - Ratio 9.20% 9.28%
For Capital Adequacy Purposes - Amount $ 382,089 $ 325,894
For Capital Adequacy Purposes - Ratio 4.00% 4.00%
Minimum Capital Requirement    
Tier 1 Capital (to Average Assets)    
Retained earnings available for dividend payments $ 392,500  
Capital Requirement to Remain Well Capitalized    
Tier 1 Capital (to Average Assets)    
Retained earnings available for dividend payments 242,300  
Dubuque Bank and Trust Company    
Total Capital (to Risk-Weighted Assets)    
Actual - Amount $ 156,544 $ 150,692
Actual - Ratio 13.63% 12.76%
For Capital Adequacy Purposes - Amount $ 91,878 $ 94,494
For Capital Adequacy Purposes - Ratio 8.00% 8.00%
To Be Well Capitalized Under Prompt Corrective Action - Amount $ 114,848 $ 118,117
To Be Well Capitalized Under Prompt Corrective Action - Ratio 10.00% 10.00%
Tier 1 Capital (to Risk-Weighted Assets)    
Actual - Amount $ 148,080 $ 140,970
Actual - Ratio 12.89% 11.93%
For Capital Adequacy Purposes - Amount $ 68,909 $ 70,870
For Capital Adequacy Purposes - Ratio 6.00% 6.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount $ 91,878 $ 94,494
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio 8.00% 8.00%
Common Equity Tier 1 (to Risk-Weighted Assets)    
Actual - Amount $ 148,080 $ 140,970
Actual - Ratio 12.89% 11.93%
For Capital Adequacy Purposes - Amount $ 51,681 $ 53,153
For Capital Adequacy Purposes - Ratio 4.50% 4.50%
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount $ 74,651 $ 76,776
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio 6.50% 6.50%
Tier 1 Capital (to Average Assets)    
Actual - Amount $ 148,080 $ 140,970
Actual - Ratio 10.05% 9.41%
For Capital Adequacy Purposes - Amount $ 58,932 $ 59,896
For Capital Adequacy Purposes - Ratio 4.00% 4.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount $ 73,666 $ 74,870
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio 5.00% 5.00%
Illinois Bank & Trust    
Total Capital (to Risk-Weighted Assets)    
Actual - Amount $ 71,410 $ 70,808
Actual - Ratio 12.62% 11.83%
For Capital Adequacy Purposes - Amount $ 45,265 $ 47,884
For Capital Adequacy Purposes - Ratio 8.00% 8.00%
To Be Well Capitalized Under Prompt Corrective Action - Amount $ 56,582 $ 59,856
To Be Well Capitalized Under Prompt Corrective Action - Ratio 10.00% 10.00%
Tier 1 Capital (to Risk-Weighted Assets)    
Actual - Amount $ 66,547 $ 66,101
Actual - Ratio 11.76% 11.04%
For Capital Adequacy Purposes - Amount $ 33,949 $ 35,913
For Capital Adequacy Purposes - Ratio 6.00% 6.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount $ 45,265 $ 47,884
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio 8.00% 8.00%
Common Equity Tier 1 (to Risk-Weighted Assets)    
Actual - Amount $ 66,547 $ 66,101
Actual - Ratio 11.76% 11.04%
For Capital Adequacy Purposes - Amount $ 25,462 $ 26,935
For Capital Adequacy Purposes - Ratio 4.50% 4.50%
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount $ 36,778 $ 38,906
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio 6.50% 6.50%
Tier 1 Capital (to Average Assets)    
Actual - Amount $ 66,547 $ 66,101
Actual - Ratio 8.39% 8.80%
For Capital Adequacy Purposes - Amount $ 31,728 $ 30,059
For Capital Adequacy Purposes - Ratio 4.00% 4.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount $ 39,660 $ 37,573
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio 5.00% 5.00%
Wisconsin Bank & Trust    
Total Capital (to Risk-Weighted Assets)    
Actual - Amount $ 113,045 $ 109,069
Actual - Ratio 14.57% 14.35%
For Capital Adequacy Purposes - Amount $ 62,057 $ 60,819
For Capital Adequacy Purposes - Ratio 8.00% 8.00%
To Be Well Capitalized Under Prompt Corrective Action - Amount $ 77,572 $ 76,024
To Be Well Capitalized Under Prompt Corrective Action - Ratio 10.00% 10.00%
Tier 1 Capital (to Risk-Weighted Assets)    
Actual - Amount $ 106,236 $ 102,523
Actual - Ratio 13.70% 13.49%
For Capital Adequacy Purposes - Amount $ 46,543 $ 45,614
For Capital Adequacy Purposes - Ratio 6.00% 6.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount $ 62,057 $ 60,819
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio 8.00% 8.00%
Common Equity Tier 1 (to Risk-Weighted Assets)    
Actual - Amount $ 106,236 $ 102,523
Actual - Ratio 13.70% 13.49%
For Capital Adequacy Purposes - Amount $ 34,907 $ 34,211
For Capital Adequacy Purposes - Ratio 4.50% 4.50%
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount $ 50,422 $ 49,416
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio 6.50% 6.50%
Tier 1 Capital (to Average Assets)    
Actual - Amount $ 106,236 $ 102,523
Actual - Ratio 10.53% 9.96%
For Capital Adequacy Purposes - Amount $ 40,373 $ 41,155
For Capital Adequacy Purposes - Ratio 4.00% 4.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount $ 50,466 $ 51,443
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio 5.00% 5.00%
New Mexico Bank & Trust    
Total Capital (to Risk-Weighted Assets)    
Actual - Amount $ 133,274 $ 119,246
Actual - Ratio 11.42% 11.20%
For Capital Adequacy Purposes - Amount $ 93,401 $ 85,208
For Capital Adequacy Purposes - Ratio 8.00% 8.00%
To Be Well Capitalized Under Prompt Corrective Action - Amount $ 116,751 $ 106,510
To Be Well Capitalized Under Prompt Corrective Action - Ratio 10.00% 10.00%
Tier 1 Capital (to Risk-Weighted Assets)    
Actual - Amount $ 123,519 $ 109,185
Actual - Ratio 10.58% 10.25%
For Capital Adequacy Purposes - Amount $ 70,050 $ 63,906
For Capital Adequacy Purposes - Ratio 6.00% 6.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount $ 93,401 $ 85,208
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio 8.00% 8.00%
Common Equity Tier 1 (to Risk-Weighted Assets)    
Actual - Amount $ 123,519 $ 109,185
Actual - Ratio 10.58% 10.25%
For Capital Adequacy Purposes - Amount $ 52,538 $ 47,929
For Capital Adequacy Purposes - Ratio 4.50% 4.50%
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount $ 75,888 $ 69,231
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio 6.50% 6.50%
Tier 1 Capital (to Average Assets)    
Actual - Amount $ 123,519 $ 109,185
Actual - Ratio 8.54% 8.16%
For Capital Adequacy Purposes - Amount $ 57,834 $ 53,529
For Capital Adequacy Purposes - Ratio 4.00% 4.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount $ 72,292 $ 66,911
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio 5.00% 5.00%
Arizona Bank & Trust    
Total Capital (to Risk-Weighted Assets)    
Actual - Amount $ 61,550 $ 58,741
Actual - Ratio 13.39% 14.64%
For Capital Adequacy Purposes - Amount $ 36,773 $ 32,108
For Capital Adequacy Purposes - Ratio 8.00% 8.00%
To Be Well Capitalized Under Prompt Corrective Action - Amount $ 45,966 $ 40,135
To Be Well Capitalized Under Prompt Corrective Action - Ratio 10.00% 10.00%
Tier 1 Capital (to Risk-Weighted Assets)    
Actual - Amount $ 56,870 $ 54,970
Actual - Ratio 12.37% 13.70%
For Capital Adequacy Purposes - Amount $ 27,579 $ 24,081
For Capital Adequacy Purposes - Ratio 6.00% 6.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount $ 36,773 $ 32,108
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio 8.00% 8.00%
Common Equity Tier 1 (to Risk-Weighted Assets)    
Actual - Amount $ 56,870 $ 54,970
Actual - Ratio 12.37% 13.70%
For Capital Adequacy Purposes - Amount $ 20,685 $ 18,061
For Capital Adequacy Purposes - Ratio 4.50% 4.50%
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount $ 29,878 $ 26,088
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio 6.50% 6.50%
Tier 1 Capital (to Average Assets)    
Actual - Amount $ 56,870 $ 54,970
Actual - Ratio 9.94% 9.59%
For Capital Adequacy Purposes - Amount $ 22,890 $ 22,922
For Capital Adequacy Purposes - Ratio 4.00% 4.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount $ 28,613 $ 28,653
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio 5.00% 5.00%
Rocky Mountain Bank    
Total Capital (to Risk-Weighted Assets)    
Actual - Amount $ 50,729 $ 50,188
Actual - Ratio 13.78% 13.72%
For Capital Adequacy Purposes - Amount $ 29,461 $ 29,254
For Capital Adequacy Purposes - Ratio 8.00% 8.00%
To Be Well Capitalized Under Prompt Corrective Action - Amount $ 36,826 $ 36,568
To Be Well Capitalized Under Prompt Corrective Action - Ratio 10.00% 10.00%
Tier 1 Capital (to Risk-Weighted Assets)    
Actual - Amount $ 47,660 $ 46,702
Actual - Ratio 12.94% 12.77%
For Capital Adequacy Purposes - Amount $ 22,096 $ 21,941
For Capital Adequacy Purposes - Ratio 6.00% 6.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount $ 29,461 $ 29,254
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio 8.00% 8.00%
Common Equity Tier 1 (to Risk-Weighted Assets)    
Actual - Amount $ 47,660 $ 46,702
Actual - Ratio 12.94% 12.77%
For Capital Adequacy Purposes - Amount $ 16,572 $ 16,455
For Capital Adequacy Purposes - Ratio 4.50% 4.50%
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount $ 23,937 $ 23,769
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio 6.50% 6.50%
Tier 1 Capital (to Average Assets)    
Actual - Amount $ 47,660 $ 46,702
Actual - Ratio 9.82% 9.79%
For Capital Adequacy Purposes - Amount $ 19,418 $ 19,078
For Capital Adequacy Purposes - Ratio 4.00% 4.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount $ 24,272 $ 23,848
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio 5.00% 5.00%
Citywide Banks    
Total Capital (to Risk-Weighted Assets)    
Actual - Amount $ 226,493 $ 83,615
Actual - Ratio 13.63% 13.25%
For Capital Adequacy Purposes - Amount $ 132,975 $ 50,475
For Capital Adequacy Purposes - Ratio 8.00% 8.00%
To Be Well Capitalized Under Prompt Corrective Action - Amount $ 166,219 $ 63,094
To Be Well Capitalized Under Prompt Corrective Action - Ratio 10.00% 10.00%
Tier 1 Capital (to Risk-Weighted Assets)    
Actual - Amount $ 221,239 $ 81,260
Actual - Ratio 13.31% 12.88%
For Capital Adequacy Purposes - Amount $ 99,731 $ 37,857
For Capital Adequacy Purposes - Ratio 6.00% 6.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount $ 132,975 $ 50,475
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio 8.00% 8.00%
Common Equity Tier 1 (to Risk-Weighted Assets)    
Actual - Amount $ 221,239 $ 81,260
Actual - Ratio 13.31% 12.88%
For Capital Adequacy Purposes - Amount $ 74,799 $ 28,392
For Capital Adequacy Purposes - Ratio 4.50% 4.50%
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount $ 108,042 $ 41,011
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio 6.50% 6.50%
Tier 1 Capital (to Average Assets)    
Actual - Amount $ 221,239 $ 81,260
Actual - Ratio 10.03% 9.33%
For Capital Adequacy Purposes - Amount $ 88,240 $ 34,827
For Capital Adequacy Purposes - Ratio 4.00% 4.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount $ 110,300 $ 43,534
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio 5.00% 5.00%
Minnesota Bank & Trust    
Total Capital (to Risk-Weighted Assets)    
Actual - Amount $ 23,760 $ 21,693
Actual - Ratio 13.76% 11.86%
For Capital Adequacy Purposes - Amount $ 13,811 $ 14,628
For Capital Adequacy Purposes - Ratio 8.00% 8.00%
To Be Well Capitalized Under Prompt Corrective Action - Amount $ 17,264 $ 18,285
To Be Well Capitalized Under Prompt Corrective Action - Ratio 10.00% 10.00%
Tier 1 Capital (to Risk-Weighted Assets)    
Actual - Amount $ 22,554 $ 20,315
Actual - Ratio 13.06% 11.11%
For Capital Adequacy Purposes - Amount $ 10,358 $ 10,971
For Capital Adequacy Purposes - Ratio 6.00% 6.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount $ 13,811 $ 14,628
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio 8.00% 8.00%
Common Equity Tier 1 (to Risk-Weighted Assets)    
Actual - Amount $ 22,554 $ 20,315
Actual - Ratio 13.06% 11.11%
For Capital Adequacy Purposes - Amount $ 7,769 $ 8,228
For Capital Adequacy Purposes - Ratio 4.50% 4.50%
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount $ 11,222 $ 11,885
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio 6.50% 6.50%
Tier 1 Capital (to Average Assets)    
Actual - Amount $ 22,554 $ 20,315
Actual - Ratio 10.77% 8.72%
For Capital Adequacy Purposes - Amount $ 8,379 $ 9,315
For Capital Adequacy Purposes - Ratio 4.00% 4.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount $ 10,473 $ 11,644
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio 5.00% 5.00%
Morrill & Janes Bank and Trust Company    
Total Capital (to Risk-Weighted Assets)    
Actual - Amount $ 72,471 $ 85,649
Actual - Ratio 13.42% 12.36%
For Capital Adequacy Purposes - Amount $ 43,206 $ 55,433
For Capital Adequacy Purposes - Ratio 8.00% 8.00%
To Be Well Capitalized Under Prompt Corrective Action - Amount $ 54,007 $ 69,292
To Be Well Capitalized Under Prompt Corrective Action - Ratio 10.00% 10.00%
Tier 1 Capital (to Risk-Weighted Assets)    
Actual - Amount $ 67,328 $ 78,615
Actual - Ratio 12.47% 11.35%
For Capital Adequacy Purposes - Amount $ 32,404 $ 41,575
For Capital Adequacy Purposes - Ratio 6.00% 6.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount $ 43,206 $ 55,433
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio 8.00% 8.00%
Common Equity Tier 1 (to Risk-Weighted Assets)    
Actual - Amount $ 67,328 $ 78,615
Actual - Ratio 12.47% 11.35%
For Capital Adequacy Purposes - Amount $ 24,303 $ 31,181
For Capital Adequacy Purposes - Ratio 4.50% 4.50%
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount $ 35,104 $ 45,040
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio 6.50% 6.50%
Tier 1 Capital (to Average Assets)    
Actual - Amount $ 67,328 $ 78,615
Actual - Ratio 9.47% 9.12%
For Capital Adequacy Purposes - Amount $ 28,435 $ 34,463
For Capital Adequacy Purposes - Ratio 4.00% 4.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount $ 35,543 $ 43,079
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio 5.00% 5.00%
Premier Valley Bank    
Total Capital (to Risk-Weighted Assets)    
Actual - Amount $ 83,772 $ 66,132
Actual - Ratio 12.95% 14.44%
For Capital Adequacy Purposes - Amount $ 51,743 $ 36,649
For Capital Adequacy Purposes - Ratio 8.00% 8.00%
To Be Well Capitalized Under Prompt Corrective Action - Amount $ 64,679 $ 45,811
To Be Well Capitalized Under Prompt Corrective Action - Ratio 10.00% 10.00%
Tier 1 Capital (to Risk-Weighted Assets)    
Actual - Amount $ 81,213 $ 64,735
Actual - Ratio 12.56% 14.13%
For Capital Adequacy Purposes - Amount $ 38,808 $ 27,487
For Capital Adequacy Purposes - Ratio 6.00% 6.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount $ 51,743 $ 36,649
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio 8.00% 8.00%
Common Equity Tier 1 (to Risk-Weighted Assets)    
Actual - Amount $ 81,213 $ 64,735
Actual - Ratio 12.56% 14.13%
For Capital Adequacy Purposes - Amount $ 29,106 $ 20,615
For Capital Adequacy Purposes - Ratio 4.50% 4.50%
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount $ 42,042 $ 29,777
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio 6.50% 6.50%
Tier 1 Capital (to Average Assets)    
Actual - Amount $ 81,213 $ 64,735
Actual - Ratio 9.80% 10.91%
For Capital Adequacy Purposes - Amount $ 33,157 $ 23,729
For Capital Adequacy Purposes - Ratio 4.00% 4.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions - Amount $ 41,446 $ 29,661
To Be Well Capitalized Under Prompt Corrective Action Provisions - Ratio 5.00% 5.00%