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Consolidated Statements of Changes in Shareholders' Equity - 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)
Accumulated Other Comprehensive Income (Loss)
Cumulative Effect, Period of Adoption, Adjustment
Treasury Stock
Beginning balance at Dec. 31, 2017 $ 920,964   $ 217,471 $ 31,913 $ 422,096 $ 258,076   $ (359)   $ (8,233)
Beginning balance (Accounting Standards Update 2016-01) at Dec. 31, 2017             $ 1,041   $ (1,041)  
Beginning balance, preferred stock (shares) at Dec. 31, 2017     9,000,000              
Beginning balance, common stock (shares) at Dec. 31, 2017       31,382,503            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Reclassification of the income tax effects of the Tax Cuts and Jobs Act from accumulated other comprehensive loss           298   (298)    
Net income 71,695         71,695        
Net current-period other comprehensive income (loss) (20,965)             (20,965)    
Preferred stock dividends [1] (14,459)         (14,459)        
Share-based compensation expense 8,605       8,605          
Exercise of warrants (shares)       5,242            
Exercise of warrants 112     $ 5 107          
Issuance of common stock under share-based-compensation arrangements (shares)       334,483            
Issuance of common stock under share-based-compensation arrangements 3,840     $ 334 3,506          
Repurchase of common shares (shares)       (719,200)            
Repurchase of common shares, value (12,976)                 (12,976)
Ending 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, 2018     9,000,000              
Ending balance, common stock (shares) at Dec. 31, 2018       31,003,028            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net income 79,327         79,327        
Net current-period other comprehensive income (loss) 21,413             21,413    
Preferred stock dividends [1] (14,459)         (14,459)        
Share-based compensation expense 8,898       8,898          
Issuance of common stock under share-based-compensation arrangements (shares)       364,922            
Issuance of common stock under share-based-compensation arrangements 1,371     $ 365 1,006          
Repurchase of common shares (shares)       (31,159)            
Repurchase of common shares, value (571)                 (571)
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)
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            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201613Member                  
Net income $ 132,578         132,578        
Net current-period other comprehensive income (loss) (4,514)             (4,514)    
Preferred stock dividends [1] (14,041)         (14,041)        
Share-based compensation expense 12,049       12,049          
Issuance of common stock under share-based-compensation arrangements (shares)       368,297            
Issuance of common stock under share-based-compensation arrangements (306)     $ 369 (675)          
Ending balance at Dec. 31, 2020 $ 1,117,086   $ 217,471 $ 32,986 $ 455,592 $ 438,581   $ (5,764)   $ (21,780)
Ending balance, preferred stock (shares) at Dec. 31, 2020 9,000,000   9,000,000              
Ending balance, common stock (shares) at Dec. 31, 2020 31,705,088     31,705,088            
[1] Dividends per share of $1.58, $1.63, $1.61, and $1.50 were declared on Series C, D, E, and F preferred stock for the year ended December 31, 2020. Dividends per share of $1.75, $1.63, $1.61, and $1.50 were declared on Series C, D, E, and F preferred stock for the years ended December 31, 2019, and 2018, respectively.