Consolidated Statements of Income (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest and dividend income:
Loans/leases, including fees	$ 69,423,001	$ 66,810,952	$ 63,363,520
Securities:
Taxable	9,618,436	10,061,066	10,781,300
Nontaxable	6,074,896	4,147,050	2,339,579
Interest-bearing deposits at financial institutions	299,227	275,352	378,566
Restricted investment securities	528,660	558,946	507,281
Federal funds sold	21,036	18,592	5,627
Total interest and dividend income	85,965,256	81,871,958	77,375,873
Interest expense:
Deposits	4,508,921	4,714,306	6,218,713
Short-term borrowings	233,994	293,020	248,545
Federal Home Loan Bank advances	6,025,749	6,863,216	7,279,599
Other borrowings	4,890,845	4,753,260	4,940,970
Junior subordinated debentures	1,234,619	1,142,719	1,038,786
Total interest expense	16,894,128	17,766,521	19,726,613
Net interest income	69,071,128	64,105,437	57,649,260
Provision for loan/lease losses	6,807,000	5,930,420	4,370,767
Net interest income after provision for loan/lease losses	62,264,128	58,175,017	53,278,493
Noninterest income:
Trust department fees	5,715,151	4,941,681	3,632,278
Investment advisory and management fees	2,798,170	2,580,140	2,361,159
Deposit service fees	4,483,585	4,267,162	3,485,929
Gains on sales of residential real estate loans, net	460,721	836,065	1,388,142
Gains on sales of government guaranteed portions of loans, net	2,040,638	2,148,979	1,069,565
Securities gains	92,363	432,492	104,600
Earnings on bank-owned life insurance	1,721,507	1,786,023	1,609,208
Debit card fees	982,005	991,300	951,200
Correspondent banking fees	1,064,030	772,120	424,458
Participation service fees on commercial loan participations	854,621	768,547	665,992
Bargain purchase gain on Community National Acquisition		1,841,385
Gains on sales of certain Community National Bank branches		2,334,216	580,000
Losses on other real estate owned, net	(447,272)	(545,340)	(1,332,972)
Other	1,231,781	2,659,058	2,261,736
Total noninterest income	20,997,300	25,813,828	16,621,295
Noninterest expenses:
Salaries and employee benefits	40,337,055	37,510,318	33,274,509
Occupancy and equipment expense	7,385,526	6,712,468	5,635,257
Professional and data processing fees	6,191,574	6,424,594	4,317,939
FDIC and other insurance	2,895,494	2,587,041	2,330,611
Loan/lease expense	1,310,644	1,521,523	1,041,824
Advertising and marketing	1,985,121	1,726,314	1,445,476
Postage and telephone	930,408	1,069,142	959,708
Stationery and supplies	579,330	562,301	541,122
Bank service charges	1,291,017	1,144,757	853,895
Acquisition and data conversion costs		2,353,162
Other-than-temporary impairment losses on securities			62,400
Other	2,363,752	2,821,038	1,796,206
Total noninterest expenses	65,269,921	64,432,658	52,258,947
Income before income taxes	17,991,507	19,556,187	17,640,841
Federal and state income tax expense	3,038,970	4,617,942	4,534,601
Net income	14,952,537	14,938,245	13,106,240
Less: net income attributable to noncontrolling interests			488,473
Net income attributable to QCR Holdings, Inc.	14,952,537	14,938,245	12,617,767
Less: preferred stock dividends	1,081,877	3,168,302	3,496,085	[1]
Net income attributable to QCR Holdings, Inc. common stockholders	$ 13,870,660	$ 11,769,943	$ 9,121,682
Basic earnings per common share (in Dollars per share)	$ 1.75	$ 2.13	$ 1.88
Diluted earnings per common share (in Dollars per share)	$ 1.72	$ 2.08	$ 1.85
Weighted average common shares outstanding (in Shares)	7,925,220	5,531,948	4,844,776
Weighted average common and common equivalent shares outstanding (in Shares)	8,048,661	5,646,926	4,919,559
Cash dividends declared per common share (in Dollars per share)	$ 0.08	$ 0.08	$ 0.08

[1] Excludes anti-dilutive shares of 124,983, 116,324, and 158,375 at December 31, 2014, 2013 and 2012, respectively.