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Note 13 - Junior Subordinated Debentures (Details) |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 12, 2019 | Sep. 27, 2017 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Oct. 01, 2017 USD ($) loan | Feb. 29, 2004 USD ($)
Other borrowings |  |  |  |  | $ 3,857,000 |  |
Debt Instrument, Face Amount |  |  | $ 40,210,000 | $ 40,210,000 |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  | 4.18% | 4.94% |  |  |
London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |
Basis points | 282.00% |  |  |  |  |  |
Junior Subordinated Debt [Member] |  |  |  |  |  |  |
Repayment period (in years) |  |  | 30 years |  |  |  |
Note Payable to QCR Holdings Capital Trust II [Member] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 12,372,000
Guaranty Bank and Trust Company [Member] |  |  |  |  |  |  |
Number of assumed junior subordinated debentures | loan |  |  |  |  |  | 1 |
Other borrowings |  |  |  |  |  | $ 3,857,000 |
Debt Instrument, Face Amount |  | $ 7,000,000 |  |  |  |  |
Repayment period (in years) |  | 4 years |  |  |  |  |

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- Definition Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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