Note 4 - DERIVATIVES AND HEDGING ACTIVITIES - Summary of Interest Rate Cap Derivatives (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Dec. 31, 2021
Derivative Assets	$ 107,326	$ 222,220
Interest rate swap
Derivative Assets	101,698	221,055
Interest rate cap
Derivative Assets	1,144	238
Cash Flow Hedging \| Interest rate cap
Derivative Assets	4,484	927
Designated as Hedging Instrument \| Derivative Assets. \| Cash Flow Hedging \| Derivative Instrument One Maturing 2023 [Member]
Notional Amount	25,000
Fair Value - Asset	$ 48	5
Designated as Hedging Instrument \| Derivative Assets. \| Cash Flow Hedging \| Derivative Instrument One Maturing 2023 [Member] \| London Interbank Offered Rate (LIBOR)
Derivative, Basis Spread on Variable Rate	1.75%
Designated as Hedging Instrument \| Derivative Assets. \| Cash Flow Hedging \| Derivative Instrument Two Maturing 2023 [Member]
Notional Amount	$ 50,000
Fair Value - Asset	$ 97	11
Designated as Hedging Instrument \| Derivative Assets. \| Cash Flow Hedging \| Derivative Instrument Two Maturing 2023 [Member] \| London Interbank Offered Rate (LIBOR)
Derivative, Basis Spread on Variable Rate	1.57%
Designated as Hedging Instrument \| Derivative Assets. \| Cash Flow Hedging \| Derivative Instrument Three Maturing 2023 [Member]
Notional Amount	$ 25,000
Fair Value - Asset	$ 48	5
Designated as Hedging Instrument \| Derivative Assets. \| Cash Flow Hedging \| Derivative Instrument Three Maturing 2023 [Member] \| London Interbank Offered Rate (LIBOR)
Derivative, Basis Spread on Variable Rate	1.80%
Designated as Hedging Instrument \| Derivative Assets. \| Cash Flow Hedging \| Derivative Instrument One Maturing 2024 [Member]
Notional Amount	$ 25,000
Fair Value - Asset	$ 355	60
Designated as Hedging Instrument \| Derivative Assets. \| Cash Flow Hedging \| Derivative Instrument One Maturing 2024 [Member] \| London Interbank Offered Rate (LIBOR)
Derivative, Basis Spread on Variable Rate	1.75%
Designated as Hedging Instrument \| Derivative Assets. \| Cash Flow Hedging \| Derivative Instrument Two Maturing 2024 [Member]
Notional Amount	$ 50,000
Fair Value - Asset	$ 723	125
Designated as Hedging Instrument \| Derivative Assets. \| Cash Flow Hedging \| Derivative Instrument Two Maturing 2024 [Member] \| London Interbank Offered Rate (LIBOR)
Derivative, Basis Spread on Variable Rate	1.57%
Designated as Hedging Instrument \| Derivative Assets. \| Cash Flow Hedging \| Derivative Instrument Three Maturing 2024 [Member]
Notional Amount	$ 25,000
Fair Value - Asset	$ 361	62
Designated as Hedging Instrument \| Derivative Assets. \| Cash Flow Hedging \| Derivative Instrument Three Maturing 2024 [Member] \| London Interbank Offered Rate (LIBOR)
Derivative, Basis Spread on Variable Rate	1.80%
Designated as Hedging Instrument \| Derivative Assets. \| Cash Flow Hedging \| Derivative Instrument One Maturing 2025 [Member]
Notional Amount	$ 25,000
Fair Value - Asset	$ 695	161
Designated as Hedging Instrument \| Derivative Assets. \| Cash Flow Hedging \| Derivative Instrument One Maturing 2025 [Member] \| London Interbank Offered Rate (LIBOR)
Derivative, Basis Spread on Variable Rate	1.75%
Designated as Hedging Instrument \| Derivative Assets. \| Cash Flow Hedging \| Derivative Instrument Two Maturing 2025 [Member]
Notional Amount	$ 50,000
Fair Value - Asset	$ 1,438	332
Designated as Hedging Instrument \| Derivative Assets. \| Cash Flow Hedging \| Derivative Instrument Two Maturing 2025 [Member] \| London Interbank Offered Rate (LIBOR)
Derivative, Basis Spread on Variable Rate	1.57%
Designated as Hedging Instrument \| Derivative Assets. \| Cash Flow Hedging \| Derivative Instrument Four Maturing 2025 [Member]
Notional Amount	$ 25,000
Fair Value - Asset	$ 719	166
Designated as Hedging Instrument \| Derivative Assets. \| Cash Flow Hedging \| Derivative Instrument Four Maturing 2025 [Member] \| London Interbank Offered Rate (LIBOR)
Derivative, Basis Spread on Variable Rate	1.80%
Designated as Hedging Instrument \| Derivative Assets. \| Cash Flow Hedging \| Interest rate cap
Notional Amount	$ 300,000
Fair Value - Asset	4,484	927
Designated as Hedging Instrument \| Derivative Liabilities \| Cash Flow Hedging
Notional Amount	300,000
Fair Value - Liability	(13,059)	(89)
Designated as Hedging Instrument \| Derivative Liabilities \| Cash Flow Hedging \| Interest rate swap
Notional Amount	39,000
Fair Value - Liability	(1,436)	(3,991)
Designated as Hedging Instrument \| Derivative Liabilities \| Cash Flow Hedging \| QCR Holdings Statutory Trust II
Notional Amount	10,000
Fair Value - Liability	$ (375)	(1,035)
Receive Rate	3.86%
Pay Rate	5.85%
Designated as Hedging Instrument \| Derivative Liabilities \| Cash Flow Hedging \| QCR Holdings Statutory Trust III
Notional Amount	$ 8,000
Fair Value - Liability	$ (300)	(828)
Receive Rate	3.86%
Pay Rate	5.85%
Designated as Hedging Instrument \| Derivative Liabilities \| Cash Flow Hedging \| QCR Holdings Statutory Trust V
Notional Amount	$ 10,000
Fair Value - Liability	$ (350)	(996)
Receive Rate	1.79%
Pay Rate	4.54%
Designated as Hedging Instrument \| Derivative Liabilities \| Cash Flow Hedging \| Community National Statutory Trust II
Notional Amount	$ 3,000
Fair Value - Liability	$ (112)	(309)
Receive Rate	3.10%
Pay Rate	5.17%
Designated as Hedging Instrument \| Derivative Liabilities \| Cash Flow Hedging \| Community National Statutory Trust III
Notional Amount	$ 3,500
Fair Value - Liability	$ (131)	(360)
Receive Rate	2.58%
Pay Rate	4.75%
Designated as Hedging Instrument \| Derivative Liabilities \| Cash Flow Hedging \| Guaranty Bankshares Statutory Trust I
Notional Amount	$ 4,500
Fair Value - Liability	$ (168)	(463)
Receive Rate	2.58%
Pay Rate	4.75%
Designated as Hedging Instrument \| Derivative Liabilities \| Cash Flow Hedging \| Loans, one
Notional Amount	$ 35,000
Fair Value - Liability	$ (2,387)	(17)
Receive Rate	1.40%
Pay Rate	0.23%
Designated as Hedging Instrument \| Derivative Liabilities \| Cash Flow Hedging \| Loans, two
Notional Amount	$ 50,000
Fair Value - Liability	$ (3,411)	(25)
Receive Rate	1.40%
Pay Rate	0.23%
Designated as Hedging Instrument \| Derivative Liabilities \| Cash Flow Hedging \| Loans, three
Notional Amount	$ 40,000
Fair Value - Liability	$ (2,742)	(34)
Receive Rate	1.40%
Pay Rate	0.23%
Designated as Hedging Instrument \| Derivative Liabilities \| Cash Flow Hedging \| Loans, four
Notional Amount	$ 25,000
Fair Value - Liability	$ (1,705)	(13)
Receive Rate	1.40%
Pay Rate	0.23%
Designated as Hedging Instrument \| Derivative Liabilities \| Cash Flow Hedging \| Loan five
Notional Amount	$ 15,000
Fair Value - Liability	$ (281)
Receive Rate	1.91%
Designated as Hedging Instrument \| Derivative Liabilities \| Cash Flow Hedging \| Loan six
Notional Amount	$ 50,000
Fair Value - Liability	$ (938)
Receive Rate	1.91%
Designated as Hedging Instrument \| Derivative Liabilities \| Cash Flow Hedging \| Loan seven
Notional Amount	$ 35,000
Fair Value - Liability	$ (656)
Receive Rate	1.91%
Designated as Hedging Instrument \| Derivative Liabilities \| Cash Flow Hedging \| Loan eight
Notional Amount	$ 50,000
Fair Value - Liability	$ (939)
Receive Rate	1.91%
Non Designated \| Interest rate swap
Derivative Assets	$ 101,698	221,055
Non Designated \| Derivative Assets.
Notional Amount	75,000
Derivative Assets	1,144	238
Non Designated \| Derivative Assets. \| Derivative Instrument One Maturing 2023 [Member]
Notional Amount	25,000
Derivative Assets	$ 41	3
Non Designated \| Derivative Assets. \| Derivative Instrument One Maturing 2023 [Member] \| London Interbank Offered Rate (LIBOR)
Derivative, Basis Spread on Variable Rate	1.90%
Non Designated \| Derivative Assets. \| Derivative Instrument One Maturing 2024 [Member]
Notional Amount	$ 25,000
Derivative Assets	$ 369	62
Non Designated \| Derivative Assets. \| Derivative Instrument One Maturing 2024 [Member] \| London Interbank Offered Rate (LIBOR)
Derivative, Basis Spread on Variable Rate	1.90%
Non Designated \| Derivative Assets. \| Derivative Instrument One Maturing 2025 [Member]
Notional Amount	$ 25,000
Derivative Assets	$ 734	$ 173
Non Designated \| Derivative Assets. \| Derivative Instrument One Maturing 2025 [Member] \| London Interbank Offered Rate (LIBOR)
Derivative, Basis Spread on Variable Rate	1.90%

Represents the pay rate of the derivative instrument.

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- Definition

Represents the receive rate of the derivative instrument.

+ References

No definition available.

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- Definition

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

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- Definition

The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

+ References

No definition available.

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- Definition

Nominal or face amount used to calculate payment on derivative.

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- Definition

Fair value as of the balance sheet date of all interest rate derivative assets designated as cash flow hedging instruments.

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- Definition

Fair value as of the balance sheet date of all interest rate derivative liabilities designated as cash flow hedging instruments.

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