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Consolidated Statement of Changes in Stockholders' Equity (Parenthetical) - $ / shares
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Exercise of stock options (shares)     39,123 500  
Cash dividends on common stock (per share) $ 0.14 $ 0.14 $ 0.14 $ 0.14  
Treasury stock purchases (shares) 65,782 372,942 97,875 500,000  
Series C Preferred Stock [Member]          
Preferred stock, dividend rate   6.00%   6.00%  
Series D Preferred Stock [Member]          
Preferred stock, dividend rate 4.50% 4.50% 4.50% 4.50% 4.50%
Series F Preferred Stock [Member]          
Preferred stock, dividend rate   6.00%   6.00%  
Series G Preferred Stock [Member]          
Preferred stock, dividend rate 6.00% 6.00% 6.00% 6.00% 6.00%
Series H Preferred Stock [Member]          
Preferred stock, dividend rate 3.50%   3.50%   3.50%