Consolidated Statements of Income (Unaudited) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Interest and dividend income:
Loans/leases, including fees	$ 16,515,966	$ 17,100,311	$ 32,250,606	$ 34,613,800
Securities:
Taxable	2,821,682	2,713,261	5,157,921	5,175,941
Nontaxable	259,813	227,574	499,159	456,298
Interest-bearing deposits at financial institutions	102,944	146,898	214,093	291,816
Restricted investment securities	137,965	107,108	301,485	212,587
Federal funds sold	23,706	63,947	90,044	85,234
Total interest and dividend income	19,862,076	20,359,099	38,513,308	40,835,676
Interest expense:
Deposits	2,321,641	3,414,644	4,747,195	6,789,653
Short-term borrowings	68,911	149,403	182,577	318,249
Federal Home Loan Bank advances	1,978,499	2,313,970	4,121,875	4,558,047
Other borrowings	1,289,739	1,466,235	2,568,918	2,855,354
Junior subordinated debentures	252,231	483,755	732,886	962,713
Total interest expense	5,911,021	7,828,007	12,353,451	15,484,016
Net interest income	13,951,055	12,531,092	26,159,857	25,351,660
Provision for loan/lease losses	1,672,221	1,376,189	2,739,885	2,979,418
Net interest income after provision for loan/lease losses	12,278,834	11,154,903	23,419,972	22,372,242
Noninterest income:
Trust department fees	894,733	729,262	1,845,535	1,635,050
Investment advisory and management fees, gross	550,243	471,799	1,081,461	906,494
Deposit service fees	856,661	860,318	1,729,333	1,683,086
Gains on sales of loans, net	755,128	553,178	1,514,821	722,132
Securities gains	148,602		1,028,914
Losses on sales of other real estate owned, net	(107,656)	(102,102)	(132,754)	(444,648)
Earnings on bank-owned life insurance	356,642	286,150	701,053	620,656
Credit card issuing fees, net of processing costs	77,336	110,431	218,496	196,573
Other	641,692	629,034	1,243,646	1,050,364
Total noninterest income	4,173,381	3,538,070	9,230,505	6,369,707
Noninterest expense:
Salaries and employee benefits	7,355,533	7,068,315	14,829,036	13,959,319
Occupancy and equipment expense	1,368,293	1,365,326	2,657,748	2,736,672
Professional and data processing fees	1,136,978	1,125,582	2,261,500	2,282,980
FDIC and other insurance	687,587	883,965	1,570,317	1,687,491
Loan/lease expense	656,069	411,097	932,297	980,112
Advertising and marketing	334,354	243,214	559,083	409,455
Postage and telephone	231,515	235,359	461,700	498,099
Stationery and supplies	123,529	123,885	258,172	244,283
Bank service charges	177,478	142,615	338,656	259,383
Prepayment fees on Federal Home Loan Bank advances			832,099
Losses on lease residual values				617,000
Other-than-temporary impairment losses on securities	118,847		118,847
Other	365,364	615,228	748,363	981,714
Total noninterest expense	12,555,547	12,214,586	25,567,818	24,656,508
Net income before income taxes	3,896,668	2,478,387	7,082,659	4,085,441
Federal and state income tax expense	1,123,454	678,550	2,077,961	1,070,671
Net income	2,773,214	1,799,837	5,004,698	3,014,770
Less: Net income attributable to noncontrolling interests	98,245	62,336	204,769	(14,740)
Net income attributable to QCR Holdings, Inc.	2,674,969	1,737,501	4,799,929	3,029,510
Less: Preferred stock dividends	1,035,742	1,037,313	2,068,113	2,070,732
Net income attributable to QCR Holdings, Inc. common stockholders	$ 1,639,227	$ 700,188	$ 2,731,816	$ 958,778
Earnings per common share attributable to QCR Holdings, Inc. common shareholders
Basic (in Dollars per share)	$ 0.34	$ 0.15	$ 0.57	$ 0.21
Diluted (in Dollars per share)	$ 0.34	$ 0.15	$ 0.57	$ 0.21
Weighted average common shares outstanding (in Shares)	4,847,740	4,591,319	4,759,728	4,582,542
Weighted average common and common equivalent shares outstanding (in Shares)	4,873,978	4,649,413	4,778,848	4,615,866
Cash dividends declared per common share (in Dollars per share)	$ 0.04	$ 0.04	$ 0.04	$ 0.04