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Note 14 - Subsequent Event (Details Textual) - USD ($)
Apr. 19, 2018
Mar. 31, 2018
Dec. 31, 2017
Assets, Total   $ 1,685,987,000 $ 1,673,872,000
Subsequent Event [Member] | WesBanco [Member]      
Business Combination, Rights to Stockholders Upon Merger 1.053    
Business Combination, Rights to Stockholders, Cash Received per Share $ 5    
Business Combination, Consideration Transferred, Total $ 378,200,000    
Business Combination, Contingent Consideration, Merger Agreement Termination Fee 12,000,000    
WesBanco [Member] | Subsequent Event [Member]      
Assets, Total $ 10,200,000,000