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Consolidated Statements of Changes in Shareholders' Equity - Unaudited - USD ($)
$ in Thousands
Total
Preferred Stock
Common Stock
Additional Paid in Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Beginning balance, preferred stock (shares) at Dec. 31, 2017   9,000,000          
Beginning balance, common stock (shares) at Dec. 31, 2017     31,382,503        
Beginning balance at Dec. 31, 2017 $ 920,964 $ 217,471 $ 31,913 $ 422,096 $ 258,076 $ (359) $ (8,233)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 53,833       53,833    
Other comprehensive income (loss) (18,555)         (18,555)  
Preferred stock dividends (10,844)       (10,844)    
Share-based compensation expense 5,641     5,641      
Exercise of warrants (shares)     5,242        
Exercise of warrants 112   $ 5 107      
Issuance of common stock under share-based compensation arrangements (shares)     299,595        
Issuance of common stock under share-based compensation arrangements 3,661   $ 300 3,361      
Ending balance, preferred stock (shares) at Sep. 30, 2018   9,000,000          
Ending balance, common stock (shares) at Sep. 30, 2018     31,687,340        
Ending balance at Sep. 30, 2018 954,812 $ 217,471 $ 32,218 431,205 302,404 (20,253) (8,233)
Beginning balance, preferred stock (shares) at Jun. 30, 2018   9,000,000          
Beginning balance, common stock (shares) at Jun. 30, 2018     31,669,643        
Beginning balance at Jun. 30, 2018 936,227 $ 217,471 $ 32,200 428,796 299,990 (33,997) (8,233)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 6,029       6,029    
Other comprehensive income (loss) 13,744         13,744  
Preferred stock dividends (3,615)       (3,615)    
Share-based compensation expense 1,980     1,980      
Issuance of common stock under share-based compensation arrangements (shares)     17,697        
Issuance of common stock under share-based compensation arrangements 447   $ 18 429 0    
Ending balance, preferred stock (shares) at Sep. 30, 2018   9,000,000          
Ending balance, common stock (shares) at Sep. 30, 2018     31,687,340        
Ending balance at Sep. 30, 2018 $ 954,812 $ 217,471 $ 32,218 431,205 302,404 (20,253) (8,233)
Beginning balance, preferred stock (shares) at Dec. 31, 2018 9,000,000 9,000,000          
Beginning balance, common stock (shares) at Dec. 31, 2018 31,003,028   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 (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 9,000,000          
Ending balance, common stock (shares) at Sep. 30, 2019 31,245,776   31,245,776        
Ending balance at Sep. 30, 2019 $ 1,019,150 $ 217,471 $ 32,526 441,499 357,608 (8,174) (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 (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 9,000,000          
Ending balance, common stock (shares) at Sep. 30, 2019 31,245,776   31,245,776        
Ending balance at Sep. 30, 2019 $ 1,019,150 $ 217,471 $ 32,526 $ 441,499 $ 357,608 $ (8,174) $ (21,780)