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Note 1 - Significant Accounting Policies (Details Textual)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Jul. 22, 2025
USD ($)
$ / shares
Sep. 30, 2025
USD ($)
shares
Sep. 30, 2024
USD ($)
shares
Sep. 30, 2025
USD ($)
shares
Sep. 30, 2024
USD ($)
shares
Dec. 31, 2024
USD ($)
Number of Unconsolidated Business Trusts Formed to Issue Trust Preferred Securities   5   5    
Share Price (in dollars per share) | $ / shares $ 43.14          
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Ending Balance   $ 0   $ 0   $ 0
Financing Receivable, Unamortized Loan Cost (Fee)   1,700   $ 1,700   2,200
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    
Loan, Mortgage, Held-for-Sale, Fair Value Disclosure   17,700   $ 17,700   16,000
Financing Receivable, Credit Loss, Expense (Reversal)   200 $ 1,100 3,900 $ 5,900  
Financing Receivable, Accrued Interest, after Allowance for Credit Loss   $ 16,700   $ 16,700   $ 17,300
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]   Other Assets   Other Assets   Other Assets
Continuing Involvement with Transferred Financial Assets, Principal Amount Outstanding   $ 1,620,000   $ 1,620,000   $ 1,550,000
Servicing Asset at Amortized Cost   13,100   13,100   12,500
Servicing Asset at Fair Value, Amount   $ 21,700   21,700   $ 21,000
Goodwill, Impairment Loss       $ 0    
Restricted Stock [Member]            
Incremental Common Shares Attributable to Participating Nonvested Shares with Non-forfeitable Dividend Rights (in shares) | shares   277,000 311,000 277,000 311,000  
Eastern Michigan Financial Corporation [Member]            
Business Combination, Acquiree's Common Stock Conversion to Cash Ratio (in dollars per share) | $ / shares $ 32.32          
Business Combination, Acquiree's Common Stock Conversion to Acquire's Common Stock Ratio 0.7116          
Business Combination, Consideration Transferred $ 90,300