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Condensed Consolidated Statements of Changes in Stockholders' Equity Condensed Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Statement of Changes in Stockholders' Equity [Abstract]        
Dividends on common stock (in dollars per share) $ 0.00 $ 0.00 $ 0.36 $ 0.34
Stock Issued During Period, Shares, Dividend Reinvestment Plan 0 0 13,475 14,626
Deferred Compensation Arrangement with Individual, Shares Issued 2,230 1,779 9,628 7,121
Stock Issued During Period, Shares, Restricted Stock Award, Gross 0 0 25,950 13,250
Stock Issued During Period, Shares, New Issues 0 0 0 947,368
Stock Issued During Period, Shares, Acquisitions 0 0 0 1,643,900
Stock Issued During Period, Shares, Employee Stock Purchase Plans 1,976 0 4,834 0
Treasury Stock, Shares, Acquired 35,427 0 35,427 2,588
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures 0 8,000 0 10,500