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Note 9 - Borrowed Funds (Details Textual)
3 Months Ended
Mar. 31, 2024
USD ($)
Dec. 31, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2023
USD ($)
Long-Term Debt $ 630,000     $ 637,000
Subordinated Debt $ 103,904,000     103,782,000 [1]
Number of Statutory Business Trusts 3      
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust $ 19,589,000     19,589,000 [1]
Trust Preferred Securities Limited to Tier One Capital Elements Net of Goodwill 25.00%      
Issued Fourth Quarter2021 [Member]        
Debt Instrument, Face Amount   $ 75,000,000    
Debt Issuance Costs, Net, Total   $ 1,740,000    
Subordinated Debt $ 74,100,000     74,000,000
Number of Maturity Years Remaining to Qualify as Tier2 Capital (Year)   5 years    
Percent Reduction Each Year to Tier 2 Capital Until Subordinated Debt Maturity Date   20.00%    
Subordinated Borrowing, Interest Rate   3.25%    
Debt Instrument, Term (Year)   10 years    
Number of Years Subordinated Debt Not Pre Payable (Year)   5 years    
Issued Fourth Quarter2021 [Member] | Secured Overnight Financing Rate (SOFR) [Member]        
Debt Instrument, Basis Spread on Variable Rate   2.30%    
Issued Third Quarter 2020 [Member]        
Debt Instrument, Face Amount     $ 30,000,000  
Debt Issuance Costs, Net, Total     $ 681,000  
Subordinated Debt $ 29,800,000     $ 29,800,000
Number of Maturity Years Remaining to Qualify as Tier2 Capital (Year)     5 years  
Percent Reduction Each Year to Tier 2 Capital Until Subordinated Debt Maturity Date     20.00%  
Subordinated Borrowing, Interest Rate     5.00%  
Debt Instrument, Term (Year)     10 years  
Number of Years Subordinated Debt Not Pre Payable (Year)     5 years  
Issued Third Quarter 2020 [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]        
Debt Instrument, Basis Spread on Variable Rate     4.87%  
Federal Home Loan Bank Advances [Member]        
Long-Term Debt, Weighted Average Interest Rate, at Point in Time 5.34%     5.34%
Federal Home Loan Bank Advances [Member] | Blanket Lien [Member]        
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged $ 2,300,000,000      
[1] Derived from audited consolidated financial statements.