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Note 16 - Regulatory Capital Requirements and Restrictions on Dividends (Details) - Capital Requirements - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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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 |  | 13.11% |  | 8.00%
Total risk-based capital for capital adequacy purposes amount |  | $ 170,969 | [1] |
Total risk-based capital for capital adequacy purposes ratio |  | 8.00% | [1] |
Total risk-based capital to be well capitalized under prompt corrective action provisions amount |  | $ 213,711 |  |
Total risk-based capital to be well capitalized under prompt corrective action provisions ratio |  | 10.00% |  |
Total risk-based capital new Basel III minimums amount |  |  |  | $ 204,376
Total risk-based capital new Basel III minimums ratio |  |  |  | 149876.00%
Tier 1 risk-based capital actual amount |  | $ 253,891 |  |
Tier 1 risk-based capital actual ratio |  | 11.88% |  | 4.00%
Tier 1 risk-based capital for capital adequacy purposes amount |  | $ 128,227 | [1] |
Tier 1 risk-based capital for capital adequacy purposes ratio |  | 6.00% | [1] |
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions amount |  | $ 170,969 |  |
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions ratio |  | 8.00% |  |
Tier 1 risk-based capital new Basel III minimums amount |  |  |  | $ 178,364
Tier 1 risk-based capital new Basel III minimums ratio |  |  |  | 74938.00%
Tier 1 leverage actual amount |  | $ 253,891 |  |
Tier 1 leverage actual ratio |  | 9.75% |  | 4.00%
Tier 1 leverage for capital adequacy purposes amount |  | $ 104,163 | [1] |
Tier 1 leverage for capital adequacy purposes ratio |  | 4.00% | [1] |
Tier 1 leverage to be well capitalized under prompt corrective action provisions amount |  | $ 130,203 |  |
Tier 1 leverage to be well capitalized under prompt corrective action provisions ratio |  | 5.00% |  |
Tier 1 leverage new Basel III minimums amount |  |  |  | $ 178,364
Tier 1 leverage new Basel III minimums ratio |  |  |  | 93658.00%
Common equity Tier 1 actual amount |  | $ 220,800 |  |
Common equity Tier 1 actual ratio |  | 10.33% |  |
Common equity Tier 1 capital adequacy purposes amount | [1] | $ 96,170 |  |
Common equity Tier 1 capital adequacy purposes ratio | [1] | 4.50% |  |
Common equity Tier 1 to be well capitalized under prompt corrective action provisions amount |  | $ 138,912 |  |
Common equity Tier 1 to be well capitalized under prompt corrective action provisions ratio |  | 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 |  | 12.50% |  | 8.00%
Total risk-based capital for capital adequacy purposes amount |  | $ 86,726 | [1] | $ 93,119
Total risk-based capital for capital adequacy purposes ratio |  | 8.00% | [1] | 10.00%
Total risk-based capital to be well capitalized under prompt corrective action provisions amount |  | $ 108,407 |  |
Total risk-based capital to be well capitalized under prompt corrective action provisions ratio |  | 10.00% |  |
Total risk-based capital new Basel III minimums amount |  |  |  | $ 104,869
Total risk-based capital new Basel III minimums ratio |  |  |  | 74495.00%
Tier 1 risk-based capital actual amount |  | $ 123,498 |  |
Tier 1 risk-based capital actual ratio |  | 11.39% |  | 4.00%
Tier 1 risk-based capital for capital adequacy purposes amount |  | $ 65,044 | [1] | $ 55,872
Tier 1 risk-based capital for capital adequacy purposes ratio |  | 6.00% | [1] | 6.00%
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions amount |  | $ 86,726 |  |
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions ratio |  | 8.00% |  |
Tier 1 risk-based capital new Basel III minimums amount |  |  |  | $ 93,785
Tier 1 risk-based capital new Basel III minimums ratio |  |  |  | 37248.00%
Tier 1 leverage actual amount |  | $ 123,498 |  |
Tier 1 leverage actual ratio |  | 8.87% |  | 4.00%
Tier 1 leverage for capital adequacy purposes amount |  | $ 55,718 | [1] | $ 66,021
Tier 1 leverage for capital adequacy purposes ratio |  | 4.00% | [1] | 5.00%
Tier 1 leverage to be well capitalized under prompt corrective action provisions amount |  | $ 69,648 |  |
Tier 1 leverage to be well capitalized under prompt corrective action provisions ratio |  | 5.00% |  |
Tier 1 leverage new Basel III minimums amount |  |  |  | $ 93,785
Tier 1 leverage new Basel III minimums ratio |  |  |  | 52817.00%
Common equity Tier 1 actual amount |  | $ 123,498 |  |
Common equity Tier 1 actual ratio |  | 11.39% |  |
Common equity Tier 1 capital adequacy purposes amount | [1] | $ 48,783 |  |
Common equity Tier 1 capital adequacy purposes ratio | [1] | 4.50% |  |
Common equity Tier 1 to be well capitalized under prompt corrective action provisions amount |  | $ 70,465 |  |
Common equity Tier 1 to be well capitalized under prompt corrective action provisions ratio |  | 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 |  | 14.39% |  | 8.00%
Total risk-based capital for capital adequacy purposes amount |  | $ 58,537 | [1] | $ 66,407
Total risk-based capital for capital adequacy purposes ratio |  | 8.00% | [1] | 10.00%
Total risk-based capital to be well capitalized under prompt corrective action provisions amount |  | $ 73,172 |  |
Total risk-based capital to be well capitalized under prompt corrective action provisions ratio |  | 10.00% |  |
Total risk-based capital new Basel III minimums amount |  |  |  | $ 76,662
Total risk-based capital new Basel III minimums ratio |  |  |  | 53126.00%
Tier 1 risk-based capital actual amount |  | $ 96,118 |  |
Tier 1 risk-based capital actual ratio |  | 13.14% |  | 4.00%
Tier 1 risk-based capital for capital adequacy purposes amount |  | $ 43,903 | [1] | $ 39,844
Tier 1 risk-based capital for capital adequacy purposes ratio |  | 6.00% | [1] | 6.00%
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions amount |  | $ 58,537 |  |
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions ratio |  | 8.00% |  |
Tier 1 risk-based capital new Basel III minimums amount |  |  |  | $ 68,772
Tier 1 risk-based capital new Basel III minimums ratio |  |  |  | 26563.00%
Tier 1 leverage actual amount |  | $ 96,118 |  |
Tier 1 leverage actual ratio |  | 10.96% |  | 4.00%
Tier 1 leverage for capital adequacy purposes amount |  | $ 35,079 | [1] | $ 41,906
Tier 1 leverage for capital adequacy purposes ratio |  | 4.00% | [1] | 5.00%
Tier 1 leverage to be well capitalized under prompt corrective action provisions amount |  | $ 43,848 |  |
Tier 1 leverage to be well capitalized under prompt corrective action provisions ratio |  | 5.00% |  |
Tier 1 leverage new Basel III minimums amount |  |  |  | $ 68,772
Tier 1 leverage new Basel III minimums ratio |  |  |  | 33525.00%
Common equity Tier 1 actual amount |  | $ 96,118 |  |
Common equity Tier 1 actual ratio |  | 13.14% |  |
Common equity Tier 1 capital adequacy purposes amount | [1] | $ 32,927 |  |
Common equity Tier 1 capital adequacy purposes ratio | [1] | 4.50% |  |
Common equity Tier 1 to be well capitalized under prompt corrective action provisions amount |  | $ 47,562 |  |
Common equity Tier 1 to be well capitalized under prompt corrective action provisions ratio |  | 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 |  | 11.96% |  | 8.00%
Total risk-based capital for capital adequacy purposes amount |  | $ 25,772 | [1] | $ 28,594
Total risk-based capital for capital adequacy purposes ratio |  | 8.00% | [1] | 10.00%
Total risk-based capital to be well capitalized under prompt corrective action provisions amount |  | $ 32,216 |  |
Total risk-based capital to be well capitalized under prompt corrective action provisions ratio |  | 10.00% |  |
Total risk-based capital new Basel III minimums amount |  |  |  | $ 35,906
Total risk-based capital new Basel III minimums ratio |  |  |  | 22875.00%
Tier 1 risk-based capital actual amount |  | $ 34,514 |  |
Tier 1 risk-based capital actual ratio |  | 10.71% |  | 4.00%
Tier 1 risk-based capital for capital adequacy purposes amount |  | $ 19,329 | [1] | $ 17,156
Tier 1 risk-based capital for capital adequacy purposes ratio |  | 6.00% | [1] | 6.00%
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions amount |  | $ 25,772 |  |
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions ratio |  | 8.00% |  |
Tier 1 risk-based capital new Basel III minimums amount |  |  |  | $ 32,325
Tier 1 risk-based capital new Basel III minimums ratio |  |  |  | 11438.00%
Tier 1 leverage actual amount |  | $ 34,514 |  |
Tier 1 leverage actual ratio |  | 9.59% |  | 4.00%
Tier 1 leverage for capital adequacy purposes amount |  | $ 14,401 | [1] | $ 17,640
Tier 1 leverage for capital adequacy purposes ratio |  | 4.00% | [1] | 5.00%
Tier 1 leverage to be well capitalized under prompt corrective action provisions amount |  | $ 18,001 |  |
Tier 1 leverage to be well capitalized under prompt corrective action provisions ratio |  | 5.00% |  |
Tier 1 leverage new Basel III minimums amount |  |  |  | $ 32,325
Tier 1 leverage new Basel III minimums ratio |  |  |  | 14112.00%
Common equity Tier 1 actual amount |  | $ 34,514 |  |
Common equity Tier 1 actual ratio |  | 10.71% |  |
Common equity Tier 1 capital adequacy purposes amount | [1] | $ 14,497 |  |
Common equity Tier 1 capital adequacy purposes ratio | [1] | 4.50% |  |
Common equity Tier 1 to be well capitalized under prompt corrective action provisions amount |  | $ 20,940 |  |
Common equity Tier 1 to be well capitalized under prompt corrective action provisions ratio |  | 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). Currently, the New Basel III minimums mirror the minimums required for capital adequacy purposes. The first phase-in of the Basel III capital conservation buffer will occur in 2016.

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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 Tier 1 Leverage Capital Basel III minimums as defined in the regulations. + 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 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 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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