The aggregate depreciation from amortized cost basis as a percent.

No definition available.

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- Details

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- Definition

Number of issuers of debt securities.

+ References

No definition available.

+ Details

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- Definition

Number of securities.

+ References

No definition available.

+ Details

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- Definition

Represents the number of states investments are held in.

+ References

No definition available.

+ Details

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- Definition

The percentage of the companies investment portfolio by type of investment.

+ References

No definition available.

+ Details

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- Definition

Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 6

-Subparagraph (b)(3)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563

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- Definition

Number of investment positions in available-for-sale investments that have been in a continuous unrealized loss position for greater than or equal to a year for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

+ References

No definition available.

+ Details

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- Definition

The fair value of available-for-sale securities that serve as collateral for borrowings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5086-111524

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611

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-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592

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-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611

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-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592

+ Details

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- Definition

The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 35

-Paragraph 34

-URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e25351-111560

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- Definition

Other investments not otherwise specified in the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.12)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 12

-Article 5

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Subparagraph g

-Article 7

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-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.1(f,g))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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Note 3 - Investment Securities (Details) (USD $)	12 Months Ended
Note 3 - Investment Securities (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Note 3 - Investment Securities (Details) [Line Items]
Number of Securities	495qcrh_NumberOfSecurities
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	212
Aggregate Depreciation From Amortized Cost Basis, Percent	1.00%
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	164
Available-for-sale Securities Pledged as Collateral (in Dollars)	$ 402,507,865	$ 497,286,275
Municipal Bonds [Member] \| Aggregate Fair Value Exceeding $5 Million [Member] \| General Obligation Bonds [Member]
Note 3 - Investment Securities (Details) [Line Items]
Number of States Investments Held In	3	2
Municipal Bonds [Member] \| Aggregate Fair Value Exceeding $5 Million [Member] \| Revenue Bonds [Member]
Note 3 - Investment Securities (Details) [Line Items]
Number of States Investments Held In	4	4
Municipal Bonds [Member] \| General Obligation Bonds [Member] \| Minimum [Member]
Note 3 - Investment Securities (Details) [Line Items]
Other Investments (in Dollars)	5,000,000	5,000,000
Municipal Bonds [Member] \| General Obligation Bonds [Member]
Note 3 - Investment Securities (Details) [Line Items]
Number of Issuers	77	84
Other Investments (in Dollars)	68,800,000	54,200,000
Number of States Investments Held In	19	20
Municipal Bonds [Member] \| Revenue Bonds [Member] \| Minimum [Member]
Note 3 - Investment Securities (Details) [Line Items]
Other Investments (in Dollars)	5,000,000	5,000,000
Municipal Bonds [Member] \| Revenue Bonds [Member]
Note 3 - Investment Securities (Details) [Line Items]
Number of Issuers	64	52
Other Investments (in Dollars)	161,700,000	119,300,000
Number of States Investments Held In	8	8
Equity Securities [Member]
Note 3 - Investment Securities (Details) [Line Items]
Percentage of Investment Portfolio	1.00%	1.00%
Other than Temporary Impairment Losses, Investments (in Dollars)	0	0	62,400
Debt Securities [Member]
Note 3 - Investment Securities (Details) [Line Items]
Other than Temporary Impairment Losses, Investments (in Dollars)	$ 0	$ 0	$ 0
General Obligation Bonds [Member] \| Stockholders' Equity, Total [Member] \| Credit Concentration Risk [Member]
Note 3 - Investment Securities (Details) [Line Items]
Concentration Risk, Percentage	0.00%	0.00%
Revenue Bonds [Member] \| Stockholders' Equity, Total [Member] \| Credit Concentration Risk [Member]
Note 3 - Investment Securities (Details) [Line Items]
Concentration Risk, Percentage	0.00%	0.00%