Consolidated Statements of Income (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Interest and dividend income:
Loans/leases, including fees	$ 15,970,837	$ 15,734,640
Securities:
Taxable	2,805,814	2,336,239
Nontaxable	395,826	239,346
Interest-bearing deposits at financial institutions	120,005	111,149
Restricted investment securities	81,322	163,520
Federal funds sold		66,338
Total interest and dividend income	19,373,804	18,651,232
Interest expense:
Deposits	1,715,740	2,425,554
Short-term borrowings	64,944	113,666
Federal Home Loan Bank advances	1,864,321	2,143,376
Other borrowings	1,257,393	1,279,179
Junior subordinated debentures	267,953	480,655
Total interest expense	5,170,351	6,442,430
Net interest income	14,203,453	12,208,802
Provision for loan/lease losses	780,446	1,067,664
Net interest income after provision for loan/lease losses	13,423,007	11,141,138
Noninterest income:
Trust department fees	883,732	950,802
Investment advisory and management fees, gross	521,462	531,218
Deposit service fees	904,406	872,672
Gains on sales of loans, net	399,090	759,693
Securities gains		880,312
Losses on sales of other real estate owned, net	(189,204)	(25,098)
Earnings on bank-owned life insurance	438,402	344,411
Credit card issuing fees, net of processing costs	127,015	141,160
Other	871,975	601,954
Total noninterest income	3,956,878	5,057,124
Noninterest expense:
Salaries and employee benefits	8,124,680	7,473,503
Occupancy and equipment expense	1,352,263	1,289,455
Professional and data processing fees	1,150,190	1,124,522
FDIC and other insurance	580,856	882,730
Loan/lease expense	218,734	276,228
Advertising and marketing	276,016	224,729
Postage and telephone	288,240	230,185
Stationery and supplies	142,966	134,643
Bank service charges	199,729	161,178
Prepayment fees on Federal Home Loan Bank advances		832,099
Other	404,406	382,999
Total noninterest expense	12,738,080	13,012,271
Net income before income taxes	4,641,805	3,185,991
Federal and state income tax expense	1,238,956	954,507
Net income	3,402,849	2,231,484
Less: Net income attributable to noncontrolling interests	166,031	106,524
Net income attributable to QCR Holdings, Inc.	3,236,818	2,124,960
Less: Preferred stock dividends and discount accretion	938,625	1,032,371
Net income attributable to QCR Holdings, Inc. common stockholders	$ 2,298,193	$ 1,092,589
Earnings per common share attributable to QCR Holdings, Inc. common shareholders
Basic (in Dollars per share)	$ 0.48	$ 0.23
Diluted (in Dollars per share)	$ 0.48	$ 0.23
Weighted average common shares outstanding (in Shares)	4,800,407	4,671,715
Weighted average common and common equivalent shares outstanding (in Shares)	4,833,399	4,683,717