Note 9 - Short-term Borrowings - Overnight Repurchase Agreements (Details) - Federal Funds Purchased [Member] - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Average daily balance	$ 6,280	$ 19,573
Average daily interest rate	0.08%	0.36%
Maximum month-end balance	$ 11,320	$ 30,430
Weighted average rate as of December 31	0.08%	0.06%

Represents information about the maximum month end balance during the period.

No definition available.

Name:	qcrh_MaximumMonthEndBalanceDuringThePeriod
Namespace Prefix:	qcrh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration