Consolidated Statements of Income - USD ($)		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Interest and dividend income:
Loans/leases, including fees		$ 74,615,499	$ 69,423,001	$ 66,810,952
Securities:
Taxable		6,772,244	9,618,436	10,061,066
Nontaxable		7,782,370	6,074,896	4,147,050
Interest-bearing deposits at financial institutions		304,602	299,227	275,352
Restricted investment securities		503,764	528,660	558,946
Federal funds sold		24,774	21,036	18,592
Total interest and dividend income		90,003,253	85,965,256	81,871,958
Interest expense:
Deposits		4,495,538	4,508,921	4,714,306
Short-term borrowings		210,306	233,930	293,020
Federal Home Loan Bank advances		3,511,541	6,025,749	6,863,216
Other borrowings		4,233,193	4,890,909	4,753,260
Junior subordinated debentures		1,255,951	1,234,619	1,142,719
Total interest expense		13,706,529	16,894,128	17,766,521
Net interest income		76,296,724	69,071,128	64,105,437
Provision for loan/lease losses		6,870,900	6,807,000	5,930,420
Net interest income after provision for loan/lease losses		69,425,824	62,264,128	58,175,017
Noninterest income:
Trust department fees		6,131,209	5,715,151	4,941,681
Investment advisory and management fees		2,971,964	2,798,170	2,580,140
Deposit service fees		3,823,818	3,847,350	3,873,349
Gains on sales of residential real estate loans, net		322,872	460,721	836,065
Gains on sales of government guaranteed portions of loans, net		1,304,575	2,040,638	2,148,979
Swap fee income		1,717,552	154,800	104,560
Securities gains		798,983	92,363	432,492
Earnings on bank-owned life insurance		1,762,107	1,721,507	1,786,023
Debit card fees		1,072,431	982,005	991,300
Correspondent banking fees		1,190,411	1,064,030	772,120
Participation service fees on commercial loan participations		865,280	854,621	768,547
Bargain purchase gain on Community National Acquisition				1,841,385
Fee income from early termination of leases		296,546	60,941	123,587
Credit card issuing fees		538,167	552,639	743,700
Lawsuit award		387,045		444,732
Gains on debt extinguishment		300,000
Other		1,046,763	812,421	1,272,127
Total noninterest income		24,529,723	21,157,357	26,845,676
Gain on sale of credit card loan receivables				495,405
Noninterest expenses:
Salaries and employee benefits		42,967,915	40,337,055	37,510,318
Occupancy and equipment expense		7,042,706	7,385,526	6,712,468
Professional and data processing fees		5,523,447	6,191,574	6,424,594
FDIC insurance, other insurance and regulatory fees		2,724,968	2,895,494	2,587,041
Loan/lease expense		882,591	665,602	1,241,704
Net cost of operations of other real estate		(1,092,401)	603,092	1,206,973
Advertising and marketing		1,900,539	1,985,121	1,726,314
Postage and communications		936,231	930,408	1,069,142
Stationery and supplies		595,689	579,330	562,301
Bank service charges		1,486,265	1,291,017	1,144,757
Losses on debt extinguishment		7,485,601
Acquisition and data conversion costs				2,353,162
Correspondent banking expense		703,495	635,630	661,451
Other		2,201,378	1,930,129	2,264,281
Total noninterest expenses		73,358,424	65,429,978	65,464,506
Income before income taxes		20,597,123	17,991,507	19,556,187
Federal and state income tax expense		3,669,242	3,038,970	4,617,942
Net income		16,927,881	14,952,537	14,938,245
Less: preferred stock dividends			1,081,877	3,168,302
Net income attributable to QCR Holdings, Inc. common stockholders		$ 16,927,881	$ 13,870,660	$ 11,769,943
Basic earnings per common share (in Dollars per share)		$ 1.64	$ 1.75	$ 2.13
Diluted earnings per common share (in Dollars per share)		$ 1.61	$ 1.72	$ 2.08
Weighted average common shares outstanding (in Shares)	[1]	10,345,286	7,925,220	5,531,948
Weighted average common and common equivalent shares outstanding (in Shares)		10,499,841	8,048,661	5,646,926
Cash dividends declared per common share (in Dollars per share)		$ 0.08	$ 0.08	$ 0.08
CNB Branches [Member]
Noninterest income:
Gain on disposal of business				$ 2,334,216
Credit Card Issuing Operations [Member]
Noninterest income:
Gain on disposal of business				$ 355,268

[1] The increase in weighted average common shares outstanding from 2014 to 2015 was primarily due to the common stock issuance discussed in Note 12 to theConsolidated Financial Statements