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Note 2 - Bank Acquisition (Details Textual)
$ in Thousands
3 Months Ended
Mar. 07, 2022
USD ($)
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Business Combination, Consideration Transferred, Total   $ 0 $ 167,913    
Debt Securities, Held-to-Maturity, Fair Value, Total   433,900   $ 431,833  
Goodwill, Ending Balance   194,074 202,524 194,074 $ 135,830
Business Combination, Acquisition Related Costs   0 19,500    
Commonwealth [Member]          
Business Combination, Consideration Transferred, Total $ 167,913        
Number of Branches 15        
Debt Securities, Held-to-Maturity, Fair Value, Total $ 162,000        
Goodwill, Ending Balance 67,000 58,244   $ 58,244  
Business Combination, Acquired Receivable, Fair Value 540,000        
Business Combination, Acquired Receivables, Gross Contractual Amount $ 549,000        
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual   $ 10,700 3,200    
Commonwealth [Member] | Merger Related Credit Loss [Member]          
Business Combination, Acquisition Related Costs     4,400    
Commonwealth [Member] | Pre-tax Merger Expenses [Member]          
Business Combination, Acquisition Related Costs     $ 24,100    
Commonwealth [Member] | Jefferson County in Kentucky [Member]          
Number of Branches 9        
Commonwealth [Member] | Shelby County in Kentucky [Member]          
Number of Branches 4        
Commonwealth [Member] | Northern Kentucky [Member]          
Number of Branches 2