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Note 8 - Regulatory Capital Requirements (Details) - Capital Requirements - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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Parent Company [Member] |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Total risk-based capital, actual, amount |  |  |  | $ 280,273
Total risk-based capital, actual, ratio |  | 12.68% |  | 13.11%
Total risk-based capital for capital adequacy purposes, amount |  | $ 192,416 | [1] | $ 170,969
Total risk-based capital for capital adequacy purposes, ratio | [1] | 8.625% |  | 8.00%
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount |  | $ 223,091 |  | $ 213,711
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 |  |  |  | $ 253,891
Tier 1 risk-based capital, actual, ratio |  | 11.45% |  | 11.88%
Tier 1 risk-based capital for capital adequacy purposes, amount |  | $ 147,797 | [1] | $ 128,227
Tier 1 risk-based capital for capital adequacy purposes, ratio | [1] | 6.625% |  | 6.00%
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount |  | $ 178,472 |  | $ 170,969
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio |  | 8.00% |  | 8.00%
Tier 1 leverage, actual, amount |  |  |  | $ 253,891
Tier 1 leverage, actual, ratio |  | 9.85% |  | 9.75%
Tier 1 leverage for capital adequacy purposes, amount |  | $ 103,728 | [1] | $ 104,163
Tier 1 leverage for capital adequacy purposes, ratio | [1] | 4.00% |  | 4.00%
Tier 1 leverage to be well capitalized under prompt corrective action provisions, amount |  | $ 129,660 |  | $ 130,203
Tier 1 leverage to be well capitalized under prompt corrective action provisions, ratio |  | 5.00% |  | 5.00%
Common equity Tier 1, actual, amount |  |  |  | $ 220,800
Common equity Tier 1, actual ratio |  | 10.11% |  | 10.33%
Common equity Tier 1 capital adequacy purposes, amount |  | $ 114,334 | [1] | $ 96,170
Common equity Tier 1 capital adequacy purposes, ratio | [1] | 5.125% |  | 4.50%
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, amount |  | $ 145,009 |  | $ 138,912
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] |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Total risk-based capital, actual, amount |  |  |  | $ 135,477
Total risk-based capital, actual, ratio |  | 12.01% |  | 12.50%
Total risk-based capital for capital adequacy purposes, amount |  | $ 98,496 | [1] | $ 86,726
Total risk-based capital for capital adequacy purposes, ratio | [1] | 8.625% |  | 8.00%
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount |  | $ 114,198 |  | $ 108,407
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 |  |  |  | $ 123,498
Tier 1 risk-based capital, actual, ratio |  | 10.92% |  | 11.39%
Tier 1 risk-based capital for capital adequacy purposes, amount |  | $ 75,656 | [1] | $ 65,044
Tier 1 risk-based capital for capital adequacy purposes, ratio | [1] | 6.625% |  | 6.00%
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount |  | $ 91,358 |  | $ 86,726
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio |  | 8.00% |  | 8.00%
Tier 1 leverage, actual, amount |  |  |  | $ 123,498
Tier 1 leverage, actual, ratio |  | 9.12% |  | 8.87%
Tier 1 leverage for capital adequacy purposes, amount |  | $ 54,680 | [1] | $ 55,718
Tier 1 leverage for capital adequacy purposes, ratio | [1] | 4.00% |  | 4.00%
Tier 1 leverage to be well capitalized under prompt corrective action provisions, amount |  | $ 68,351 |  | $ 69,648
Tier 1 leverage to be well capitalized under prompt corrective action provisions, ratio |  | 5.00% |  | 5.00%
Common equity Tier 1, actual, amount |  |  |  | $ 123,498
Common equity Tier 1, actual ratio |  | 10.92% |  | 11.39%
Common equity Tier 1 capital adequacy purposes, amount |  | $ 58,526 | [1] | $ 48,783
Common equity Tier 1 capital adequacy purposes, ratio | [1] | 5.125% |  | 4.50%
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, amount |  | $ 74,229 |  | $ 70,465
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, ratio |  | 6.50% |  | 6.50%
Cedar Rapids Bank and Trust [Member] |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Total risk-based capital, actual, amount |  |  |  | $ 105,285
Total risk-based capital, actual, ratio |  | 13.98% |  | 14.39%
Total risk-based capital for capital adequacy purposes, amount |  | $ 65,729 | [1] | $ 58,537
Total risk-based capital for capital adequacy purposes, ratio | [1] | 8.625% |  | 8.00%
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount |  | $ 76,208 |  | $ 73,172
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 |  |  |  | $ 96,118
Tier 1 risk-based capital, actual, ratio |  | 12.73% |  | 13.14%
Tier 1 risk-based capital for capital adequacy purposes, amount |  | $ 50,488 | [1] | $ 43,903
Tier 1 risk-based capital for capital adequacy purposes, ratio | [1] | 6.625% |  | 6.00%
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount |  | $ 60,966 |  | $ 58,537
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio |  | 8.00% |  | 8.00%
Tier 1 leverage, actual, amount |  |  |  | $ 96,118
Tier 1 leverage, actual, ratio |  | 11.03% |  | 10.96%
Tier 1 leverage for capital adequacy purposes, amount |  | $ 35,197 | [1] | $ 35,079
Tier 1 leverage for capital adequacy purposes, ratio | [1] | 4.00% |  | 4.00%
Tier 1 leverage to be well capitalized under prompt corrective action provisions, amount |  | $ 43,996 |  | $ 43,848
Tier 1 leverage to be well capitalized under prompt corrective action provisions, ratio |  | 5.00% |  | 5.00%
Common equity Tier 1, actual, amount |  |  |  | $ 96,118
Common equity Tier 1, actual ratio |  | 12.73% |  | 13.14%
Common equity Tier 1 capital adequacy purposes, amount |  | $ 39,056 | [1] | $ 32,927
Common equity Tier 1 capital adequacy purposes, ratio | [1] | 5.125% |  | 4.50%
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, amount |  | $ 49,535 |  | $ 47,562
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, ratio |  | 6.50% |  | 6.50%
Rockford Bank and Trust [Member] |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Total risk-based capital, actual, amount |  |  |  | $ 38,544
Total risk-based capital, actual, ratio |  | 12.03% |  | 11.96%
Total risk-based capital for capital adequacy purposes, amount |  | $ 28,096 | [1] | $ 25,772
Total risk-based capital for capital adequacy purposes, ratio | [1] | 8.625% |  | 8.00%
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount |  | $ 32,575 |  | $ 32,216
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 |  |  |  | $ 34,514
Tier 1 risk-based capital, actual, ratio |  | 10.78% |  | 10.71%
Tier 1 risk-based capital for capital adequacy purposes, amount |  | $ 21,581 | [1] | $ 19,329
Tier 1 risk-based capital for capital adequacy purposes, ratio | [1] | 6.625% |  | 6.00%
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount |  | $ 26,060 |  | $ 25,772
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio |  | 8.00% |  | 8.00%
Tier 1 leverage, actual, amount |  |  |  | $ 34,514
Tier 1 leverage, actual, ratio |  | 9.52% |  | 9.59%
Tier 1 leverage for capital adequacy purposes, amount |  | $ 14,758 | [1] | $ 14,401
Tier 1 leverage for capital adequacy purposes, ratio | [1] | 4.00% |  | 4.00%
Tier 1 leverage to be well capitalized under prompt corrective action provisions, amount |  | $ 18,447 |  | $ 18,001
Tier 1 leverage to be well capitalized under prompt corrective action provisions, ratio |  | 5.00% |  | 5.00%
Common equity Tier 1, actual, amount |  |  |  | $ 34,514
Common equity Tier 1, actual ratio |  | 10.78% |  | 10.71%
Common equity Tier 1 capital adequacy purposes, amount |  | $ 16,695 | [1] | $ 14,497
Common equity Tier 1 capital adequacy purposes, ratio | [1] | 5.125% |  | 4.50%
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, amount |  | $ 21,174 |  | $ 20,940
Common equity Tier 1 to be well capitalized under prompt corrective action provisions, ratio |  | 6.50% |  | 6.50%
[1] | The minimums under Basel III phase in higher by .625% (the capital conservation buffer) annually until 2019. The fully phased-in minimums are 10.5% (Total risk-based capital), 8.5% (Tier 1 risk-based capital), and 7.0% (Common equity Tier 1). At December 31, 2015, the New Basel III minimums mirrored the minimums required for capital adequacy purposes. The first phase-in of the Basel III capital conservation buffer occured in 2016.

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- Definition Common equity Tier 1 as defined in the regulations. + References No definition available. + Details
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- Definition The minimum amount 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 The amount of Common equity Tier 1 required to be categorized as well capitalized under the regulatory framework for prompt corrective action. + 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 The amount of total capital as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 4: http://www.xbrl.org/2003/role/presentationRef -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 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition The Total risk based capital ratio (total capital divided by risk weighted assets) required to be categorized as "well capitalized", in the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition Total Capital divided by risk weighted assets as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 + Details
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- Definition The minimum amount of Tier 1 Leverage Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition The minimum amount of Tier 1 Leverage Capital for capital adequacy purposes divided by average assets as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 + Details
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- Definition The amount of Tier 1 Leverage Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition The amount of Tier 1 Leverage Capital required to be categorized as well capitalized divided by average assets as defined in the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition Tier 1 Risk Based Capital as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 + Details
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- Definition The minimum amount of Tier 1 Risk Based Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + 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 under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 + Details
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- Definition The amount of Tier 1 Risk Based Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition Tier 1 capital divided by risk weighted assets as defined by regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 + Details
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