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Note 5 - DERIVATIVES AND HEDGING ACTIVITIES - Summary of Hedged Interest Rate Swap and Cap Derivatives (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Derivative [Line Items]    
Derivative Asset $ 207,775 $ 186,781
Derivative Liabilities (230,742) (214,823)
Hedged Derivatives | Cash Flow Hedges | Interest rate swaps    
Derivative [Line Items]    
Derivative Liability, Notional Amount 300,000  
Derivative, Notional Amount 114,310  
Derivative Asset 691 1,905
Derivative Liabilities (21,218) (30,623)
Derivative Assets (Liabilities), net (360) 1,855
Derivative Liabilities (20,167) (30,573)
Hedged Derivatives | Cash Flow Hedges | QCR Holdings Statutory Trust V    
Derivative [Line Items]    
Derivative Asset, Notional Amount $ 10,000  
Receive Rate 6.13%  
Pay Rate 4.54%  
Derivative Asset $ 156 427
Hedged Derivatives | Cash Flow Hedges | Community National Statutory Trust III    
Derivative [Line Items]    
Derivative Asset, Notional Amount $ 3,500  
Receive Rate 6.05%  
Pay Rate 4.75%  
Derivative Asset $ 73 197
Hedged Derivatives | Cash Flow Hedges | Guaranty Bankshares Statutory Trust I    
Derivative [Line Items]    
Derivative Asset, Notional Amount $ 4,500  
Receive Rate 6.05%  
Pay Rate 4.75%  
Derivative Asset $ 57 153
Hedged Derivatives | Cash Flow Hedges | Community National Statutory Trust II    
Derivative [Line Items]    
Derivative Asset, Notional Amount $ 3,000  
Receive Rate 6.43%  
Pay Rate 5.17%  
Derivative Asset $ 49 132
Hedged Derivatives | Cash Flow Hedges | QCR Holdings Statutory Trust II    
Derivative [Line Items]    
Derivative Asset, Notional Amount $ 10,000  
Receive Rate 7.41%  
Pay Rate 5.85%  
Derivative Asset $ 164 443
Hedged Derivatives | Cash Flow Hedges | QCR Holdings Statutory Trust III    
Derivative [Line Items]    
Derivative Asset, Notional Amount $ 8,000  
Receive Rate 7.41%  
Pay Rate 5.85%  
Derivative Asset $ 131 353
Hedged Derivatives | Cash Flow Hedges | Guaranty Statutory Trust II    
Derivative [Line Items]    
Derivative Asset, Notional Amount $ 10,310  
Receive Rate 5.91%  
Pay Rate 4.09%  
Derivative Asset $ 61 200
Hedged Derivatives | Cash Flow Hedges | QCR Holdings Subordinated Note    
Derivative [Line Items]    
Derivative Liability, Notional Amount $ 65,000  
Receive Rate 4.02%  
Pay Rate 4.02%  
Derivative Liabilities $ (1,051) (50)
Hedged Derivatives | Cash Flow Hedges | Loans, one    
Derivative [Line Items]    
Derivative Liability, Notional Amount $ 35,000  
Receive Rate 1.40%  
Pay Rate 4.43%  
Derivative Liabilities $ (3,852) (5,445)
Hedged Derivatives | Cash Flow Hedges | Loans, two    
Derivative [Line Items]    
Derivative Liability, Notional Amount $ 50,000  
Receive Rate 1.40%  
Pay Rate 4.43%  
Derivative Liabilities $ (5,503) (7,779)
Hedged Derivatives | Cash Flow Hedges | Loans, three    
Derivative [Line Items]    
Derivative Liability, Notional Amount $ 40,000  
Receive Rate 1.40%  
Pay Rate 4.43%  
Derivative Liabilities $ (4,411) (6,233)
Hedged Derivatives | Cash Flow Hedges | Loans, four    
Derivative [Line Items]    
Derivative Liability, Notional Amount $ 25,000  
Receive Rate 1.30%  
Pay Rate 4.43%  
Derivative Liabilities $ (2,772) (3,916)
Hedged Derivatives | Cash Flow Hedges | Loan five    
Derivative [Line Items]    
Derivative Liability, Notional Amount $ 15,000  
Receive Rate 1.91%  
Pay Rate 4.43%  
Derivative Liabilities $ (363) (720)
Hedged Derivatives | Cash Flow Hedges | Loan six    
Derivative [Line Items]    
Derivative Liability, Notional Amount $ 50,000  
Receive Rate 1.91%  
Pay Rate 4.43%  
Derivative Liabilities $ (1,209) (2,400)
Hedged Derivatives | Cash Flow Hedges | Loan seven    
Derivative [Line Items]    
Derivative Liability, Notional Amount $ 35,000  
Receive Rate 1.91%  
Pay Rate 4.43%  
Derivative Liabilities $ (847) (1,680)
Hedged Derivatives | Cash Flow Hedges | Loan eight    
Derivative [Line Items]    
Derivative Liability, Notional Amount $ 50,000  
Receive Rate 1.91%  
Pay Rate 4.43%  
Derivative Liabilities $ (1,210) (2,400)
Hedged Derivatives | Fair Value Hedges | Interest rate swaps    
Derivative [Line Items]    
Derivative, Notional Amount 325,000  
Derivative Liabilities (2,339) (335)
Derivative Assets (Liabilities), net (2,339) (335)
Hedged Derivatives | Fair Value Hedges | Loan Nine    
Derivative [Line Items]    
Derivative, Notional Amount $ 15,000  
Receive Rate 4.30%  
Pay Rate 4.60%  
Derivative Liabilities   (35)
Hedged Derivatives | Fair Value Hedges | Loan ten    
Derivative [Line Items]    
Derivative, Notional Amount $ 25,000  
Receive Rate 4.30%  
Pay Rate 4.38%  
Derivative Liabilities $ (40) (77)
Hedged Derivatives | Fair Value Hedges | Loan Eleven    
Derivative [Line Items]    
Derivative, Notional Amount $ 15,000  
Receive Rate 4.30%  
Pay Rate 4.38%  
Derivative Liabilities $ (24) (46)
Hedged Derivatives | Fair Value Hedges | Loan Twelve    
Derivative [Line Items]    
Derivative, Notional Amount $ 20,000  
Receive Rate 4.30%  
Pay Rate 4.38%  
Derivative Liabilities $ (32) (61)
Hedged Derivatives | Fair Value Hedges | Loan Thirteen    
Derivative [Line Items]    
Derivative, Notional Amount $ 30,000  
Receive Rate 4.30%  
Pay Rate 4.21%  
Derivative Liabilities $ (139) (79)
Hedged Derivatives | Fair Value Hedges | Loan fourteen    
Derivative [Line Items]    
Derivative, Notional Amount $ 15,000  
Receive Rate 4.30%  
Pay Rate 4.21%  
Derivative Liabilities $ (70) (40)
Hedged Derivatives | Fair Value Hedges | Loan fifteen    
Derivative [Line Items]    
Derivative, Notional Amount $ 20,000  
Receive Rate 4.30%  
Pay Rate 4.21%  
Derivative Liabilities $ (93) (53)
Hedged Derivatives | Fair Value Hedges | Loan sixteen    
Derivative [Line Items]    
Derivative, Notional Amount $ 32,500  
Receive Rate 4.30%  
Pay Rate 4.08%  
Derivative Liabilities $ (263) (44)
Hedged Derivatives | Fair Value Hedges | Loan seventeen    
Derivative [Line Items]    
Derivative, Notional Amount $ 15,000  
Receive Rate 4.30%  
Pay Rate 4.08%  
Derivative Liabilities $ (121) (20)
Hedged Derivatives | Fair Value Hedges | Loan Eighteen    
Derivative [Line Items]    
Derivative, Notional Amount $ 20,000  
Receive Rate 4.30%  
Pay Rate 4.08%  
Derivative Liabilities $ (162) (27)
Hedged Derivatives | Fair Value Hedges | Loan Nineteen    
Derivative [Line Items]    
Derivative, Notional Amount $ 32,500  
Receive Rate 4.30%  
Pay Rate 3.98%  
Derivative Asset   14
Derivative Liabilities $ (358)  
Hedged Derivatives | Fair Value Hedges | Loan Twenty    
Derivative [Line Items]    
Derivative, Notional Amount $ 15,000  
Receive Rate 4.30%  
Pay Rate 3.98%  
Derivative Asset   6
Derivative Liabilities $ (165)  
Hedged Derivatives | Fair Value Hedges | Loan twenty one    
Derivative [Line Items]    
Derivative, Notional Amount $ 25,000  
Receive Rate 4.30%  
Pay Rate 3.98%  
Derivative Asset   11
Derivative Liabilities $ (275)  
Hedged Derivatives | Fair Value Hedges | Loan twenty two    
Derivative [Line Items]    
Derivative, Notional Amount $ 30,000  
Receive Rate 4.30%  
Pay Rate 3.90%  
Derivative Asset   77
Derivative Liabilities $ (397)  
Hedged Derivatives | Fair Value Hedges | Loan twenty three    
Derivative [Line Items]    
Derivative, Notional Amount $ 15,000  
Receive Rate 4.30%  
Pay Rate 3.90%  
Derivative Asset   $ 39
Derivative Liabilities $ (200)