Consolidated Statements Of Income (Unaudited) (USD $)	3 Months Ended			9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011		Sep. 30, 2012	Sep. 30, 2011
Interest and dividend income:
Loans/leases, including fees	$ 15,804,330	$ 16,215,725		$ 47,748,276	$ 48,466,331
Securities:
Taxable	2,781,889	2,877,574		8,353,482	8,035,495
Nontaxable	690,466	244,209		1,624,577	743,368
Interest-bearing deposits at financial institutions	75,818	97,714		288,400	311,807
Restricted investment securities	131,967	126,333		378,067	427,818
Federal funds sold	3,055	7,875		3,055	97,919
Total interest and dividend income	19,487,525	19,569,430		58,395,857	58,082,738
Interest expense:
Deposits	1,488,749	2,201,070		4,834,006	6,948,265
Short-term borrowings	60,500	65,502		202,731	248,079
Federal Home Loan Bank advances	1,809,888	1,931,259		5,503,329	6,053,134
Other borrowings	1,238,254	1,301,144		3,719,730	3,870,062
Junior subordinated debentures	260,616	241,751		787,597	974,637
Total interest expense	4,858,007	5,740,726		15,047,393	18,094,177
Net interest income	14,629,518	13,828,704		43,348,464	39,988,561
Provision for loan/lease losses	1,496,194	2,456,965		3,325,109	5,196,850
Net interest income after provision for loan/lease losses	13,133,324	11,371,739		40,023,355	34,791,711
Noninterest income:
Trust department fees	914,586	762,133		2,650,552	2,607,668
Investment advisory and management fees	575,711	549,515		1,776,499	1,630,976
Deposit service fees	847,343	893,685		2,626,822	2,623,018
Gains on sales of loans, net	684,546	408,364		1,965,957	1,923,185
Securities gains		443,614		104,600	1,472,528
Gains (losses) on other real estate owned, net	(745,799)	42,262		(1,324,468)	(90,492)
Earnings on bank-owned life insurance	399,925	331,440		1,196,987	1,032,493
Credit card issuing fees, net of processing costs	140,542	178,636		409,730	397,132
Other	1,300,328	725,658		2,734,890	1,969,304
Total noninterest income	4,117,182	4,335,307		12,141,569	13,565,812
Noninterest expense:
Salaries and employee benefits	8,201,323	7,651,695		24,581,642	22,480,731
Occupancy and equipment expense	1,459,901	1,359,758		4,177,076	4,017,506
Professional and data processing fees	1,065,780	1,077,435		3,342,847	3,338,935
FDIC and other insurance	599,422	578,776		1,756,493	2,149,093
Loan/lease expense	273,166	839,993		755,066	1,772,290
Advertising and marketing	437,130	277,376		1,057,246	836,459
Postage and telephone	190,868	242,103		716,050	703,803
Stationery and supplies	139,592	122,582		417,769	380,754
Bank service charges	211,378	186,351		609,599	525,007
Prepayment fees on Federal Home Loan Bank advances					832,099
Other-than-temporary impairment losses on securities				62,400	118,847
Other	452,957	437,080		1,402,492	1,185,443
Total noninterest expense	13,031,517	12,773,149		38,878,680	38,340,967
Net income before income taxes	4,218,989	2,933,897		13,286,244	10,016,556
Federal and state income tax expense	1,034,479	667,296		3,425,506	2,745,257
Net income	3,184,510	2,266,601		9,860,738	7,271,299
Less: Net income attributable to noncontrolling interests	127,177	103,446		494,431	308,215
Net income attributable to QCR Holdings, Inc.	3,057,333	2,163,155		9,366,307	6,963,084
Less: Preferred stock dividends	810,837	2,188,058	[1]	2,685,248	4,256,171	[1]
Net income attributable to QCR Holdings, Inc. common stockholders	$ 2,246,496	$ (24,903)		$ 6,681,059	$ 2,706,913
Earnings per common share attributable to QCR Holdings, Inc. common shareholders
Basic (in Dollars per share)	$ 0.45	$ (0.01)		$ 1.37	$ 0.56
Diluted (in Dollars per share)	$ 0.44	$ (0.01)		$ 1.35	$ 0.56
Weighted average common shares outstanding (in Shares)	4,978,699	4,866,692		4,871,626	4,795,382
Weighted average common and common equivalent shares outstanding (in Shares)	5,080,288	4,866,692		4,938,514	4,847,433
Cash dividends declared per common share (in Dollars per share)				$ 0.04	$ 0.04

[1] For the three and nine months ended September 30, 2011, includes approximately $1.2 million of accelerated accretion of discount on the Treasury Captial Purchase Program preferred shares repurchased during the third quarter of 2011.