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Note 2 - Mergers and Acquisitions - FHLB Advances (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Jul. 01, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Common stock, issued (in shares) 15,718,208   13,918,168
Common stock, outstanding (in shares) 15,718,208   13,918,168
Springfield Bancshares      
Business Acquisition [Line Items]      
Overnight FHLB advances assumed   $ 40.0  
FHLB term advances assumed   34.5  
Subordinated debentures   4.7  
Bank stock loan   4.8  
Fair value of FHLB and other borrowings assumed   $ 84.1