Consolidated Statements Of Income (Unaudited) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Interest and dividend income:
Loans/leases, including fees	$ 15,973,109	$ 16,515,966	$ 31,943,946	$ 32,250,606
Securities:
Taxable	2,765,779	2,821,682	5,571,593	5,157,921
Nontaxable	538,285	259,813	934,111	499,159
Interest-bearing deposits at financial institutions	92,577	102,944	212,582	214,093
Restricted investment securities	164,778	137,965	246,100	301,485
Federal funds sold		23,706		90,044
Total interest and dividend income	19,534,528	19,862,076	38,908,332	38,513,308
Interest expense:
Deposits	1,629,517	2,321,641	3,345,257	4,747,195
Short-term borrowings	77,287	68,911	142,231	182,577
Federal Home Loan Bank advances	1,829,120	1,978,499	3,693,441	4,121,875
Other borrowings	1,224,083	1,289,739	2,481,476	2,568,918
Junior subordinated debentures	259,028	252,231	526,981	732,886
Total interest expense	5,019,035	5,911,021	10,189,386	12,353,451
Net interest income	14,515,493	13,951,055	28,718,946	26,159,857
Provision for loan/lease losses	1,048,469	1,672,221	1,828,915	2,739,885
Net interest income after provision for loan/lease losses	13,467,024	12,278,834	26,890,031	23,419,972
Noninterest income:
Trust department fees	852,234	894,733	1,735,966	1,845,535
Investment advisory and management fees, gross	679,326	550,243	1,200,788	1,081,461
Deposit service fees	875,073	856,661	1,779,479	1,729,333
Gains on sales of loans, net	882,321	755,128	1,281,411	1,514,821
Securities gains	104,600	148,602	104,600	1,028,914
Losses on sales of other real estate owned, net	(389,465)	(107,656)	(578,669)	(132,754)
Earnings on bank-owned life insurance	358,660	356,642	797,062	701,053
Credit card issuing fees, net of processing costs	142,173	77,336	269,188	218,496
Other	562,587	641,692	1,434,562	1,243,646
Total noninterest income	4,067,509	4,173,381	8,024,387	9,230,505
Noninterest expense:
Salaries and employee benefits	8,255,639	7,355,533	16,380,319	14,829,036
Occupancy and equipment expense	1,364,912	1,368,293	2,717,175	2,657,748
Professional and data processing fees	1,126,877	1,136,978	2,277,067	2,261,500
FDIC and other insurance	576,215	687,587	1,157,071	1,570,317
Loan/lease expense	263,166	656,069	481,900	932,297
Advertising and marketing	344,100	334,354	620,116	559,083
Postage and telephone	236,942	231,515	525,182	461,700
Stationery and supplies	135,211	123,529	278,177	258,172
Bank service charges	198,492	177,478	398,221	338,656
Prepayment fees on Federal Home Loan Bank advances				832,099
Other-than-temporary impairment losses on securities	62,400	118,847	62,400	118,847
Other	545,129	365,364	949,535	748,363
Total noninterest expense	13,109,083	12,555,547	25,847,163	25,567,818
Net income before income taxes	4,425,450	3,896,668	9,067,255	7,082,659
Federal and state income tax expense	1,152,071	1,123,454	2,391,027	2,077,961
Net income	3,273,379	2,773,214	6,676,228	5,004,698
Less: Net income attributable to noncontrolling interests	201,223	98,245	367,254	204,769
Net income attributable to QCR Holdings, Inc.	3,072,156	2,674,969	6,308,974	4,799,929
Less: Preferred stock dividends	935,786	1,035,742	1,874,411	2,068,113
Net income attributable to QCR Holdings, Inc. common stockholders	$ 2,136,370	$ 1,639,227	$ 4,434,563	$ 2,731,816
Earnings per common share attributable to QCR Holdings, Inc. common shareholders
Basic (in Dollars per share)	$ 0.44	$ 0.34	$ 0.92	$ 0.57
Diluted (in Dollars per share)	$ 0.44	$ 0.34	$ 0.91	$ 0.57
Weighted average common shares outstanding (in Shares)	4,835,773	4,847,740	4,818,090	4,759,728
Weighted average common and common equivalent shares outstanding (in Shares)	4,901,853	4,873,978	4,867,628	4,778,848
Cash dividends declared per common share (in Dollars per share)	$ 0.04	$ 0.04	$ 0.04	$ 0.04