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Note 13 - Employee Benefit Plans (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Postretirement Health Coverage [Member]      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total $ 222,000 $ 14,000 $ 12,000
Defined Benefit Plan, Benefit Obligation, Ending Balance 10,000 107,000  
Deferred Compensation Plan [Member] | Former Directors of Valley Ridge Financial Corp. [Member]      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total 1,000 3,000 5,000
Defined Benefit Plan, Benefit Obligation, Ending Balance 8,000 33,000  
Deferred Compensation Plan [Member] | Four Former Executive Officers of Valley Ridge Financial Corp. [Member]      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total 17,000 26,000 6,000
Defined Benefit Plan, Benefit Obligation, Ending Balance $ 306,000 368,000  
Defined Benefit Plan, Benefit Obligation, Term (Year) 15 years    
Deferred Compensation Plan [Member] | One Former Executive Officer and One Current Executive Officer of Lakestone [Member]      
Defined Benefit Plan, Benefit Obligation, Ending Balance $ 0 337,000  
Defined Benefit Plan, Benefit Obligation, Term (Year) 15 years    
Deferred Compensation Plan [Member] | Minimum [Member] | Former Directors of Valley Ridge Financial Corp. [Member]      
Interest Rate on Deferred Director Fees 5.50%    
Deferred Compensation Plan [Member] | Maximum [Member] | Former Directors of Valley Ridge Financial Corp. [Member]      
Interest Rate on Deferred Director Fees 5.84%    
The 401(k) Plan [Member]      
Defined Contribution Plan, Cost $ 465,000 $ 233,000 $ 207,000