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Note 5 - Goodwill (Details Textual) - USD ($)
$ in Thousands
Mar. 31, 2022
Mar. 07, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Goodwill, Ending Balance $ 202,524   $ 135,830 $ 12,513 $ 12,513
Commercial Banking [Member]          
Goodwill, Ending Balance 175,000        
WM&T [Member]          
Goodwill, Ending Balance 28,000        
Commonwealth [Member]          
Goodwill, Ending Balance 66,694 $ 67,000 $ 0    
Commonwealth [Member] | WM&T [Member]          
Goodwill, Ending Balance $ 67,000