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Note 19 - Commitments and Contingencies (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Maximum performance guarantee term | 1 year |
Liability for potential guarantee obligations | $ 0 | $ 0
Sale of mortgage loans in the secondary market | 3,673 | 1,295
Loans sold with recourse provisions | 24,500 | 12,400
Loans receivable, held for sale | 3,673 | 1,295
Amount of uninsured cash | 34,600 | 52,600
Standby Letters of Credit [Member] |  |
Other commitment | 23,800 | $ 20,300
Commitments to Extend Credit [Member] |  |
Other commitment | $ 1,200,000 |

X
- Definition The amount of liability for potential obligations under performance guarantees. + References No definition available. + Details
Name: | qcrh_LiabilityForPotentialObligationsUnderPerformanceGuarantees
Namespace Prefix: | qcrh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Loans sold with recourse provisions. + References No definition available. + Details
Name: | qcrh_LoansSoldWithRecourseProvisions
Namespace Prefix: | qcrh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The subsidiary banks maximum performance guaranty term. + References No definition available. + Details
Name: | qcrh_SubsidiaryBanksPerformanceGuarantyTermMaximum
Namespace Prefix: | qcrh_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation. + References No definition available. + Details
Name: | us-gaap_CashUninsuredAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, after allowance for bad debt, of loan receivables held-for-sale that are not part of a disposal group. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522 + Details
Name: | us-gaap_LoansReceivableHeldForSaleNetNotPartOfDisposalGroup
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
Name: | us-gaap_OtherCommitment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_StandbyLettersOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CommitmentsToExtendCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |