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Note 1 - Summary of Significant Accounting Policies (Details Textual)
 12 Months Ended
Dec. 31, 2022
USD ($)
Jan. 01, 2022
USD ($)
Dec. 31, 2021
USD ($)
May 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Aug. 08, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jun. 01, 2014
USD ($)
Number of Unconsolidated Business Trusts Formed to Issue Trust Preferred Securities 5              
Financing Receivable, before Allowance for Credit Loss, Total $ 3,916,619,000   $ 3,453,459,000          
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Ending Balance 0              
Financing Receivable, Unamortized Loan Cost (Fee) $ (1,000,000.0)   2,500,000          
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, Allowance for Credit Loss, Ending Balance $ 42,246,000   35,363,000   $ 37,967,000   $ 23,889,000  
Retained Earnings (Accumulated Deficit), Total 216,313,000   174,536,000          
Financing Receivable, Allowance for Credit Loss, Allowance Reduction (900,000)              
Repossessed Assets, Total $ 0   0          
Core Deposits [Member]                
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (Year) 10 years              
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]                
Financing Receivable, Allowance for Credit Loss, Ending Balance $ (400,000)              
Retained Earnings (Accumulated Deficit), Total   $ 300,000            
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Other Assets [Member]                
Deferred Income Tax Assets, Net   $ 100,000            
Not Designated as Hedging Instrument [Member] | Mortgage Loan Derivative [Member]                
Derivative Asset, Total 100,000   300,000          
Commercial Loan [Member]                
Loan Participation, Amount $ 33,500,000   $ 24,200,000          
SBA, CARES Act, Paycheck Protection Program [Member]                
Number of Loans Originated Under the Paycheck Protection Program           2,200    
Financing Receivable, before Allowance for Credit Loss, Total           $ 554,000,000    
Financing Receivable, Not Yet Forgiven, Number of Loans 5              
Financing Receivable, Not Yet Forgiven $ 500,000              
Amortization of Deferred Loan Origination Fees, Net $ 100,000              
SBA, CARES Act, Paycheck Protection Program, Round Two [Member]                
Number of Loans Originated Under the Paycheck Protection Program       1,200        
Financing Receivable, before Allowance for Credit Loss, Total       $ 209,000,000        
Financing Receivable, Not Yet Forgiven, Number of Loans 6              
Financing Receivable, Not Yet Forgiven $ 400,000              
Amortization of Deferred Loan Origination Fees, Net $ 1,000,000.0              
Firstbank Corporation [Member]                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Total               $ 1,500,000,000
Business Combination Branches Acquired               46