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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
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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%

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- Definition The minimum amount of Total Capital required for capital adequacy purposes, without the capital conservation buffer. + References No definition available. + Details
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- Definition The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes, without capital conservation buffer. + References No definition available. + Details
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- Definition Ratio of Common equity Tier 1 required for capital adequacy purposes as defined in the regulations. + References No definition available. + Details
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- Definition Ratio of Common equity Tier 1 required for capital adequacy purposes, considering without capital conservation buffer. + References No definition available. + Details
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- Definition The ratio Tier 1 Leverage Capital required to be categorized as well capitalized as defined in the regulatory framework for prompt corrective action. + References No definition available. + Details
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- Definition Amount of Common Equity Tier 1 Risk-based Capital required to be categorized as adequately capitalized, considering without capital conservation buffer. + References No definition available. + Details
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- Definition The minimum amount of Tier 1 Leverage Capital for capital adequacy purposes divided by average assets, considering without capital conservation. + References No definition available. + Details
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- Definition The minimum amount of Tier 1 Leverage Capital required for capital adequacy purposes, considering without capital conservation buffer. + References No definition available. + Details
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- Definition The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes, considering without capital conservation buffer. + References No definition available. + Details
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- Definition The minimum amount of Tier 1 Risk Based Capital required for capital adequacy purposes, considering without capital conservation buffer. + References No definition available. + Details
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- Definition The amount of total capital as defined in the regulations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47304-110998 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47080-110998 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 + Details
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- Definition The minimum amount of Total Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 + Details
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- Definition The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 + Details
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- Definition The amount of Total Capital required to be categorized as well as capitalized under the regulatory framework for prompt corrective action. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 + Details
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