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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Loans held for investment, covered $ 20,483 $ 27,948
Other real estate owned, covered $ 44 $ 105
Common stock, par value (in dollars per share) $ 1 $ 1
Common stock, authorized (in shares) 50,000,000 50,000,000
Common stock, issued (in shares) 21,381,779 21,381,779
Treasury stock (in shares) 4,991,277 4,383,553
Undesignated Par Value [Member]    
Preferred stock, no par value (in dollars per share) $ 0 $ 0 [1]
Preferred stock, authorized (in shares) 1,000,000 1,000,000 [1]
Designated Par Value [Member]    
Preferred stock, authorized (in shares) 25,000 25,000 [1]
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01 [1]
Preferred stock, outstanding (in shares) 0 0 [1]
[1] Derived from audited financial statements