Consolidated Statements Of Income (Unaudited) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Interest and dividend income:
Loans/leases, including fees	$ 15,088,827	$ 15,970,837
Securities:
Taxable	2,460,449	2,805,814
Nontaxable	802,473	395,826
Interest-bearing deposits at financial institutions	59,754	120,005
Restricted investment securities	125,105	81,322
Federal funds sold	874
Total interest and dividend income	18,537,482	19,373,804
Interest expense:
Deposits	1,116,791	1,715,740
Short-term borrowings	64,267	64,944
Federal Home Loan Bank advances	1,732,812	1,864,321
Other borrowings	1,190,755	1,257,393
Junior subordinated debentures	241,540	267,953
Total interest expense	4,346,165	5,170,351
Net interest income	14,191,317	14,203,453
Provision for loan/lease losses	1,057,782	780,446
Net interest income after provision for loan/lease losses	13,133,535	13,423,007
Noninterest income:
Trust department fees	1,039,670	883,732
Investment advisory and management fees	609,341	521,462
Deposit service fees	907,823	904,406
Gains on sales of residential real estate loans	291,151	291,433
Gains on sales of government guaranteed portions of loans	845,224	107,657
Earnings on bank-owned life insurance	438,687	438,402
Credit card issuing fees, net of processing costs	49,954	127,015
Losses on other real estate owned, net	(446,630)	(189,204)
Other	1,468,809	871,975
Total noninterest income	5,204,029	3,956,878
Noninterest expense:
Salaries and employee benefits	8,742,683	8,124,680
Occupancy and equipment expense	1,428,870	1,352,263
Professional and data processing fees	1,140,061	1,150,190
FDIC and other insurance	555,911	580,856
Loan/lease expense	245,091	218,734
Advertising and marketing	264,568	276,016
Postage and telephone	218,691	288,240
Stationery and supplies	110,670	142,966
Bank service charges	275,495	199,729
Acquisition costs (Note 8)	356,578
Other	619,882	404,406
Total noninterest expense	13,958,500	12,738,080
Net income before income taxes	4,379,064	4,641,805
Federal and state income tax expense	1,113,920	1,238,956
Net income	3,265,144	3,402,849
Less: Net income attributable to noncontrolling interests		166,031
Net income attributable to QCR Holdings, Inc.	3,265,144	3,236,818
Less: Preferred stock dividends	810,837	938,625
Net income attributable to QCR Holdings, Inc. common stockholders	$ 2,454,307	$ 2,298,193
Earnings per common share attributable to QCR Holdings, Inc. common shareholders
Basic (in Dollars per share)	$ 0.50	$ 0.48
Diluted (in Dollars per share)	$ 0.49	$ 0.48
Weighted average common shares outstanding (in Shares)	4,927,591	4,800,407
Weighted average common and common equivalent shares outstanding (in Shares)	5,034,342	4,833,399
Cash dividends declared per common share (in Dollars per share)	$ 0	$ 0