Consolidated Statements Of Income (Unaudited) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Interest and dividend income:
Loans/leases, including fees	$ 16,369,605	$ 15,973,109	$ 31,458,432	$ 31,943,946
Securities:
Taxable	2,629,832	2,765,779	5,090,281	5,571,593
Nontaxable	944,100	538,285	1,746,573	934,111
Interest-bearing deposits at financial institutions	61,724	92,577	121,478	212,582
Restricted investment securities	131,151	164,778	256,256	246,100
Federal funds sold	2,989		3,863
Total interest and dividend income	20,139,401	19,534,528	38,676,883	38,908,332
Interest expense:
Deposits	1,176,855	1,629,517	2,293,646	3,345,257
Short-term borrowings	103,435	77,287	167,702	142,231
Federal Home Loan Bank advances	1,726,622	1,829,120	3,459,434	3,693,441
Other borrowings	1,162,893	1,224,083	2,353,648	2,481,476
Junior subordinated debentures	261,544	259,028	503,084	526,981
Total interest expense	4,431,349	5,019,035	8,777,514	10,189,386
Net interest income	15,708,052	14,515,493	29,899,369	28,718,946
Provision for loan/lease losses	1,520,137	1,048,469	2,577,919	1,828,915
Net interest income after provision for loan/lease losses	14,187,915	13,467,024	27,321,450	26,890,031
Noninterest income:
Trust department fees	1,197,181	852,234	2,236,851	1,735,966
Investment advisory and management fees	695,094	679,326	1,304,435	1,200,788
Deposit service fees	1,054,223	875,073	1,962,046	1,779,479
Gains on sales of residential real estate loans	246,621	271,333	537,772	562,766
Gains on sales government guaranteed portions of loans	765,738	610,988	1,610,962	718,645
Securities gains	16,460	104,600	16,460	104,600
Earnings on bank-owned life insurance	423,883	358,660	862,570	797,062
Bargain purchase gain on Community National acquisition	1,841,385		1,841,385
Credit card issuing fees, net of processing costs	85,017	142,173	134,971	269,188
Losses on other real estate owned, net	(83,339)	(389,465)	(529,969)	(578,669)
Other	706,493	562,587	2,175,302	1,434,562
Total noninterest income	6,948,756	4,067,509	12,152,785	8,024,387
Noninterest expense:
Salaries and employee benefits	9,186,233	8,255,639	17,928,916	16,380,319
Occupancy and equipment expense	1,586,841	1,364,912	3,015,711	2,717,175
Professional and data processing fees	1,438,753	1,126,877	2,578,814	2,277,067
FDIC and other insurance	627,390	576,215	1,183,301	1,157,071
Loan/lease expense	251,868	263,166	496,959	481,900
Advertising and marketing	412,041	344,100	676,609	620,116
Postage and telephone	257,611	236,942	476,302	525,182
Stationery and supplies	150,718	135,211	261,388	278,177
Bank service charges	284,345	198,492	559,840	398,221
Acquisition costs	432,326		788,904
Other-than-temporary impairment losses on securities		62,400		62,400
Other	606,223	545,129	1,226,105	949,535
Total noninterest expense	15,234,349	13,109,083	29,192,849	25,847,163
Net income before income taxes	5,902,322	4,425,450	10,281,386	9,067,255
Federal and state income tax expense	1,857,091	1,152,071	2,971,011	2,391,027
Net income	4,045,231	3,273,379	7,310,375	6,676,228
Less: Net income attributable to noncontrolling interests		201,223		367,254
Net income attributable to QCR Holdings, Inc.	4,045,231	3,072,156	7,310,375	6,308,974
Less: Preferred stock dividends	810,838	935,786	1,621,675	1,874,411
Net income attributable to QCR Holdings, Inc. common stockholders	$ 3,234,393	$ 2,136,370	$ 5,688,700	$ 4,434,563
Earnings per common share attributable to QCR Holdings, Inc. common shareholders
Basic (in Dollars per share)	$ 0.60	$ 0.44	$ 1.10	$ 0.92
Diluted (in Dollars per share)	$ 0.59	$ 0.44	$ 1.08	$ 0.91
Weighted average common shares outstanding (in Shares)	5,393,062	4,835,773	5,160,327	4,818,090
Weighted average common and common equivalent shares outstanding (in Shares)	5,497,275	4,901,853	5,265,809	4,867,628
Cash dividends declared per common share (in Dollars per share)	$ 0.04	$ 0.04	$ 0.04	$ 0.04