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Note 1 - Summary of Significant Accounting Policies (Details Textual)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Jun. 01, 2014
USD ($)
Number of Unconsolidated Business Trusts Formed to Issue Trust Preferred Securities 5    
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Ending Balance $ 0    
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss 3,600 $ 2,600  
Financing Receivable, Unamortized Loan Cost (Fee) $ 2,200 2,400  
Interest Income on Commercial and Mortgage Loans Discontinued Period (Day) 90 days    
Maximum Delinquency Period for Consumer and Credit Card Loans to be Charged Off (Day) 120 days    
Financing Receivable, Accrued Interest, after Allowance for Credit Loss $ 17,300 16,900  
Repossessed Assets $ 200    
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Other Assets    
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Other Assets    
Not Designated as Hedging Instrument [Member] | Mortgage Loan Derivative [Member]      
Derivative Asset $ 100    
Derivative Liability   100  
Commercial Loan [Member]      
Loan Participation, Amount $ 48,600 $ 46,700  
Firstbank Corporation [Member]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Total     $ 1,500,000
Business Combination Branches Acquired     46