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Consolidated Statements of Changes in Shareholders' Equity - Unaudited - USD ($)
$ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Preferred Stock
Common Stock
Additional Paid in Capital
Retained Earnings
Retained Earnings
Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Beginning balance, preferred stock (shares) at Dec. 31, 2018     9,000,000            
Beginning balance, common stock (shares) at Dec. 31, 2018       31,003,028          
Beginning balance at Dec. 31, 2018 $ 956,816   $ 217,471 $ 32,252 $ 434,314 $ 316,651   $ (22,663) $ (21,209)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net income 51,801         51,801      
Other comprehensive income (loss) 14,489             14,489  
Preferred stock dividends [1] (10,844)         (10,844)      
Share-based compensation expense 6,557       6,557        
Issuance of common stock under share-based compensation arrangements (shares)       273,907          
Issuance of common stock under share-based compensation arrangements 902     $ 274 628        
Repurchase of common shares (shares)       (31,159)          
Repurchase of common shares (571)               (571)
Ending balance, preferred stock (shares) at Sep. 30, 2019     9,000,000            
Ending balance, common stock (shares) at Sep. 30, 2019       31,245,776          
Ending balance at Sep. 30, 2019 $ 1,019,150   $ 217,471 $ 32,526 441,499 357,608   (8,174) (21,780)
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201613Member                
Beginning balance, preferred stock (shares) at Dec. 31, 2018     9,000,000            
Beginning balance, common stock (shares) at Dec. 31, 2018       31,003,028          
Beginning balance at Dec. 31, 2018 $ 956,816   $ 217,471 $ 32,252 434,314 316,651   (22,663) (21,209)
Ending balance, preferred stock (shares) at Dec. 31, 2019 9,000,000   9,000,000            
Ending balance, common stock (shares) at Dec. 31, 2019 31,336,791     31,336,791          
Ending balance at Dec. 31, 2019 $ 1,052,795 $ (61,475) $ 217,471 $ 32,617 444,218 381,519 $ (61,475) (1,250) (21,780)
Beginning balance, preferred stock (shares) at Jun. 30, 2019     9,000,000            
Beginning balance, common stock (shares) at Jun. 30, 2019       31,202,023          
Beginning balance at Jun. 30, 2019 991,405   $ 217,471 $ 32,483 439,067 334,157   (9,993) (21,780)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net income 27,066         27,066      
Other comprehensive income (loss) 1,819             1,819  
Preferred stock dividends [2] (3,615)         (3,615)      
Share-based compensation expense 2,133       2,133        
Issuance of common stock under share-based compensation arrangements (shares)       43,753          
Issuance of common stock under share-based compensation arrangements 342     $ 43 299        
Ending balance, preferred stock (shares) at Sep. 30, 2019     9,000,000            
Ending balance, common stock (shares) at Sep. 30, 2019       31,245,776          
Ending balance at Sep. 30, 2019 $ 1,019,150   $ 217,471 $ 32,526 441,499 357,608   (8,174) (21,780)
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201613Member                
Beginning balance, preferred stock (shares) at Dec. 31, 2019 9,000,000   9,000,000            
Beginning balance, common stock (shares) at Dec. 31, 2019 31,336,791     31,336,791          
Beginning balance at Dec. 31, 2019 $ 1,052,795 $ (61,475) $ 217,471 $ 32,617 444,218 381,519 $ (61,475) (1,250) (21,780)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net income 76,332         76,332      
Other comprehensive income (loss) (14,501)             (14,501)  
Preferred stock dividends [1] (10,626)         (10,626)      
Share-based compensation expense 8,855       8,855        
Issuance of common stock under share-based compensation arrangements (shares)       218,333          
Issuance of common stock under share-based compensation arrangements $ 111     $ 219 (108)        
Ending balance, preferred stock (shares) at Sep. 30, 2020 9,000,000   9,000,000            
Ending balance, common stock (shares) at Sep. 30, 2020 31,555,124     31,555,124          
Ending balance at Sep. 30, 2020 $ 1,051,491   $ 217,471 $ 32,836 452,965 385,750   (15,751) (21,780)
Beginning balance, preferred stock (shares) at Jun. 30, 2020     9,000,000            
Beginning balance, common stock (shares) at Jun. 30, 2020       31,510,287          
Beginning balance at Jun. 30, 2020 1,007,847   $ 217,471 $ 32,791 450,665 338,665   (9,965) (21,780)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net income 50,515         50,515      
Other comprehensive income (loss) (5,786)             (5,786)  
Preferred stock dividends [2] (3,430)         (3,430)      
Share-based compensation expense 2,028       2,028        
Issuance of common stock under share-based compensation arrangements (shares)       44,837          
Issuance of common stock under share-based compensation arrangements $ 317     $ 45 272        
Ending balance, preferred stock (shares) at Sep. 30, 2020 9,000,000   9,000,000            
Ending balance, common stock (shares) at Sep. 30, 2020 31,555,124     31,555,124          
Ending balance at Sep. 30, 2020 $ 1,051,491   $ 217,471 $ 32,836 $ 452,965 $ 385,750   $ (15,751) $ (21,780)
[1] Dividends per share of $1.232778, $1.21875, $1.209375, and $1.125 per share were declared on Series C, D, E, and F preferred stock for the nine months ended September 30, 2020. Dividends per share of $1.3125, $1.21875, $1.209375, and $1.125 per share were declared on Series C, D, E, and F preferred stock for the nine months ended September 30, 2019.
[2] Dividends per share of $0.357778, $0.40625, $0.403125, and $0.375 per share were declared on Series C, D, E, and F preferred stock for the three months ended September 30, 2020. Dividends per share of $0.4375, $0.40625, $0.403125, and $0.375 per share were declared on Series C, D, E, and F preferred stock for the three months ended September 30, 2019.