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Consolidated Statements of Changes in Equity (Parentheticals) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash dividends per share common stock (in dollars per share) $ 0.68 $ 0.59 $ 0.51
Purchase of treasury stock (in shares)   1,761 13,066
Issuance of common stock (in shares) 2,226,779 4,525,904 3,846,493
Series D Preferred Stock      
Cash dividends per share preferred stock (in dollars per share)   $ 52.50 $ 70.00