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Note 8 - Regulatory Capital Requirements and Restrictions on Dividends - Capital Requirements (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Total risk-based capital, actual, amount $ 407,222 $ 383,282
Total risk-based capital, actual, ratio 11.23% 11.15%
Total risk-based capital for capital adequacy purposes, amount, without capital conservation buffer $ 290,121 $ 275,090
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 $ 358,118 $ 318,073
Total risk-based capital for capital adequacy purposes, ratio 9.875% 9.25%
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount $ 362,652 $ 343,862
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 $ 369,677 $ 348,530
Tier 1 risk-based capital, actual, ratio 10.19% 10.14%
Tier 1 risk-based capital for capital adequacy purposes, amount, without capital conservation buffer $ 217,591 $ 206,317
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 $ 285,588 $ 249,300
Tier 1 risk-based capital for capital adequacy purposes, ratio 7.875% 7.25%
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount $ 290,121 $ 275,090
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio 8.00% 8.00%
Tier 1 leverage, actual, amount $ 369,677 $ 348,530
Tier 1 leverage, actual, ratio 9.22% 8.98%
Tier 1 leverage for capital adequacy purposes, amount, without capital conservation buffer $ 160,373 $ 155,256
Tier 1 leverage for capital adequacy purposes, ratio, without capital conservation buffer 4.00% 4.00%
Tier 1 leverage for capital adequacy purposes, amount $ 160,373 $ 155,256
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 $ 200,466 $ 194,070
Tier 1 leverage to be well capitalized under prompt corrective action provisions, ratio 5.00% 5.00%
Common equity Tier 1, actual, amount $ 332,096 $ 313,012
Common equity Tier 1, actual ratio 9.16% 9.10%
Common equity Tier 1 for capital adequacy purposes, amount, without capital conservation buffer $ 163,193 $ 154,738
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 $ 231,190 $ 197,721
Common equity Tier 1 for capital adequacy purposes, ratio 6.375% 5.75%
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, amount $ 235,723 $ 223,510
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 $ 158,480 $ 160,112
Total risk-based capital, actual, ratio 11.67% 12.35%
Total risk-based capital for capital adequacy purposes, amount, without capital conservation buffer $ 108,599 $ 103,711
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 $ 134,052 $ 119,916
Total risk-based capital for capital adequacy purposes, ratio 9.875% 9.25%
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount $ 135,748 $ 129,639
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 $ 145,157 $ 147,472
Tier 1 risk-based capital, actual, ratio 10.69% 11.38%
Tier 1 risk-based capital for capital adequacy purposes, amount, without capital conservation buffer $ 81,449 $ 77,783
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 $ 106,902 $ 93,988
Tier 1 risk-based capital for capital adequacy purposes, ratio 7.875% 7.25%
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount $ 108,599 $ 103,711
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio 8.00% 8.00%
Tier 1 leverage, actual, amount $ 145,157 $ 147,472
Tier 1 leverage, actual, ratio 9.19% 9.52%
Tier 1 leverage for capital adequacy purposes, amount, without capital conservation buffer $ 63,193 $ 61,985
Tier 1 leverage for capital adequacy purposes, ratio, without capital conservation buffer 4.00% 4.00%
Tier 1 leverage for capital adequacy purposes, amount $ 63,193 $ 61,985
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 $ 78,992 $ 77,481
Tier 1 leverage to be well capitalized under prompt corrective action provisions, ratio 5.00% 5.00%
Common equity Tier 1, actual, amount $ 145,157 $ 147,472
Common equity Tier 1, actual ratio 10.69% 11.38%
Common equity Tier 1 for capital adequacy purposes, amount, without capital conservation buffer $ 61,087 $ 58,337
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 $ 86,540 $ 74,542
Common equity Tier 1 for capital adequacy purposes, ratio 6.375% 5.75%
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, amount $ 88,236 $ 84,265
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 $ 143,414 $ 138,492
Total risk-based capital, actual, ratio 11.76% 11.88%
Total risk-based capital for capital adequacy purposes, amount, without capital conservation buffer $ 97,602 $ 93,272
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 $ 120,477 $ 107,846
Total risk-based capital for capital adequacy purposes, ratio 9.875% 9.25%
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount $ 122,003 $ 116,590
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 $ 130,203 $ 126,601
Tier 1 risk-based capital, actual, ratio 10.67% 10.86%
Tier 1 risk-based capital for capital adequacy purposes, amount, without capital conservation buffer $ 73,202 $ 69,954
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 $ 96,077 $ 84,528
Tier 1 risk-based capital for capital adequacy purposes, ratio 7.875% 7.25%
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount $ 97,602 $ 93,272
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio 8.00% 8.00%
Tier 1 leverage, actual, amount $ 130,203 $ 126,601
Tier 1 leverage, actual, ratio 9.83% 11.68%
Tier 1 leverage for capital adequacy purposes, amount, without capital conservation buffer $ 52,961 $ 43,348
Tier 1 leverage for capital adequacy purposes, ratio, without capital conservation buffer 4.00% 4.00%
Tier 1 leverage for capital adequacy purposes, amount $ 52,961 $ 43,348
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 $ 66,201 $ 54,185
Tier 1 leverage to be well capitalized under prompt corrective action provisions, ratio 5.00% 5.00%
Common equity Tier 1, actual, amount $ 130,203 $ 126,601
Common equity Tier 1, actual ratio 10.67% 10.86%
Common equity Tier 1 for capital adequacy purposes, amount, without capital conservation buffer $ 54,901 $ 52,465
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 $ 77,777 $ 67,039
Common equity Tier 1 for capital adequacy purposes, ratio 6.375% 5.75%
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, amount $ 79,302 $ 75,783
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 $ 70,656 $ 66,271
Total risk-based capital, actual, ratio 11.70% 11.71%
Total risk-based capital for capital adequacy purposes, amount, without capital conservation buffer $ 48,330 $ 45,293
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 $ 59,658 $ 52,370
Total risk-based capital for capital adequacy purposes, ratio 9.875% 9.25%
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount $ 60,413 $ 56,616
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 $ 65,443 $ 61,941
Tier 1 risk-based capital, actual, ratio 10.83% 10.94%
Tier 1 risk-based capital for capital adequacy purposes, amount, without capital conservation buffer $ 36,248 $ 33,970
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 $ 47,575 $ 41,047
Tier 1 risk-based capital for capital adequacy purposes, ratio 7.875% 7.25%
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount $ 48,330 $ 45,293
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio 8.00% 8.00%
Tier 1 leverage, actual, amount $ 65,443 $ 61,941
Tier 1 leverage, actual, ratio 9.56% 9.77%
Tier 1 leverage for capital adequacy purposes, amount, without capital conservation buffer $ 27,384 $ 25,354
Tier 1 leverage for capital adequacy purposes, ratio, without capital conservation buffer 4.00% 4.00%
Tier 1 leverage for capital adequacy purposes, amount $ 27,384 $ 25,354
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 $ 34,229 $ 31,693
Tier 1 leverage to be well capitalized under prompt corrective action provisions, ratio 5.00% 5.00%
Common equity Tier 1, actual, amount $ 65,443 $ 61,941
Common equity Tier 1, actual ratio 10.83% 10.94%
Common equity Tier 1 for capital adequacy purposes, amount, without capital conservation buffer $ 27,186 $ 25,477
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 $ 38,513 $ 32,554
Common equity Tier 1 for capital adequacy purposes, ratio 6.375% 5.75%
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, amount $ 39,268 $ 36,801
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 $ 47,697 $ 45,684
Total risk-based capital, actual, ratio 10.81% 11.28%
Total risk-based capital for capital adequacy purposes, amount, without capital conservation buffer $ 35,283 $ 32,413
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 $ 43,553 $ 37,477
Total risk-based capital for capital adequacy purposes, ratio 9.875% 9.25%
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount $ 44,104 $ 40,516
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 $ 42,181 $ 40,615
Tier 1 risk-based capital, actual, ratio 9.56% 10.02%
Tier 1 risk-based capital for capital adequacy purposes, amount, without capital conservation buffer $ 26,463 $ 24,310
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 $ 34,732 $ 29,374
Tier 1 risk-based capital for capital adequacy purposes, ratio 7.875% 7.25%
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount $ 35,283 $ 32,413
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio 8.00% 8.00%
Tier 1 leverage, actual, amount $ 42,181 $ 40,615
Tier 1 leverage, actual, ratio 8.90% 8.94%
Tier 1 leverage for capital adequacy purposes, amount, without capital conservation buffer $ 18,947 $ 18,177
Tier 1 leverage for capital adequacy purposes, ratio, without capital conservation buffer 4.00% 4.00%
Tier 1 leverage for capital adequacy purposes, amount $ 18,947 $ 18,177
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 $ 23,684 $ 22,721
Tier 1 leverage to be well capitalized under prompt corrective action provisions, ratio 5.00% 5.00%
Common equity Tier 1, actual, amount $ 42,181 $ 40,615
Common equity Tier 1, actual ratio 9.56% 10.02%
Common equity Tier 1 for capital adequacy purposes, amount, without capital conservation buffer $ 19,847 $ 18,232
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 $ 28,116 $ 23,297
Common equity Tier 1 for capital adequacy purposes, ratio 6.375% 5.75%
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, amount $ 28,668 $ 26,335
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, ratio 6.50% 6.50%