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Consolidated Statements of Stockholders' Equity (Parentheticals) (unaudited) - $ / shares
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Consolidated Statements of Stockholders' Equity    
Number of shares issued for trust preferred securities conversions   529,292
Cash dividend declared (in dollars per share) $ 0.69 $ 0.69