Specific allowance of amount of investment in financing receivables modified by troubled debt restructurings.

No definition available.

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Namespace Prefix:	qcrh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after troubled debt restructuring, of modified financing receivable.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount, before troubled debt restructuring, of financing receivable to be modified.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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NOTE 3 - LOANS/LEASES RECEIVABLE - Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2020 USD ($) loan	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($) loan	Sep. 30, 2020 USD ($) loan	Sep. 30, 2019 USD ($) loan
Number of Loans / Leases \| loan	3		4	8	9
Pre-Modification Recorded Investment	$ 197		$ 172	$ 453	$ 881
Post-Modification Recorded Investment	$ 197	$ 55	172	$ 453	831
Specific Allowance			$ 56		$ 76
Payment Deferral [Member]
Number of Loans / Leases \| loan	3		3	8	7
Pre-Modification Recorded Investment	$ 197		$ 116	$ 453	$ 238
Post-Modification Recorded Investment	$ 197		$ 116	$ 453	238
Specific Allowance					$ 20
Extended Maturity [Member]
Number of Loans / Leases \| loan			1		1
Pre-Modification Recorded Investment			$ 56		$ 56
Post-Modification Recorded Investment			56		56
Specific Allowance			$ 56		$ 56
Principal Forgiveness [Member]
Number of Loans / Leases \| loan					1
Pre-Modification Recorded Investment					$ 587
Post-Modification Recorded Investment					$ 537
Finance Leases Portfolio Segment [Member] \| Payment Deferral [Member]
Number of Loans / Leases \| loan			3	3	6
Pre-Modification Recorded Investment			$ 116	$ 145	$ 219
Post-Modification Recorded Investment			$ 116	$ 145	219
Specific Allowance					$ 20
Commercial Portfolio Segment [Member]
Post-Modification Recorded Investment		$ 48
Commercial Portfolio Segment [Member] \| Payment Deferral [Member]
Number of Loans / Leases \| loan	3			5	1
Pre-Modification Recorded Investment	$ 197			$ 308	$ 19
Post-Modification Recorded Investment	$ 197			$ 308	$ 19
Commercial Portfolio Segment [Member] \| Principal Forgiveness [Member]
Number of Loans / Leases \| loan					1
Pre-Modification Recorded Investment					$ 587
Post-Modification Recorded Investment					$ 537
Installment And Other Consumer [Member] \| Extended Maturity [Member]
Number of Loans / Leases \| loan			1		1
Pre-Modification Recorded Investment			$ 56		$ 56
Post-Modification Recorded Investment			56		56
Specific Allowance			$ 56		$ 56