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Consolidated Statements of Changes in Shareholders' Equity - USD ($)
$ in Thousands
Total
Preferred Stock
Common Stock
Additional Paid in Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Preferred Stock
Preferred Stock
Preferred Stock
Common Stock
Common Stock
Common Stock
Common Stock
Additional Paid in Capital
Beginning balance at Dec. 31, 2015 $ 553,902 $ 55,569 $ 27,432 $ 362,607 $ 124,511 $ (7,984) $ (8,233)          
Beginning balance, preferred stock (shares) at Dec. 31, 2015   2,300,000                    
Beginning balance, common stock (shares) at Dec. 31, 2015     26,901,801                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 78,702       78,702              
Other comprehensive income (loss) 3,092         3,092            
Issuance of stock, net of offering costs               $ 161,902 $ 161,902 $ 64,031 $ 2,642 $ 61,389
Issuance of stock, net of offering costs (shares)                 6,700,000   2,641,677  
Preferred stock dividends (9,515)       (9,515)              
Share-based compensation expense 6,189     6,189                
Exercise of warrants 1,531   $ 345 1,186                
Exercise of warrants (shares)     345,414                  
Issuance of common stock under share-based-compensation arrangements $ (3,962)   $ 401 (4,363)                
Issuance of common stock under share-based-compensation arrangements (shares)     401,025                  
Repurchase of shares (shares) 0                      
Ending balance at Dec. 31, 2016 $ 855,872 $ 217,471 $ 30,820 427,008 193,698 (4,892) (8,233)          
Ending balance, preferred stock (shares) at Dec. 31, 2016   9,000,000                    
Ending balance, common stock (shares) at Dec. 31, 2016     30,289,917                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 78,837       78,837              
Other comprehensive income (loss) 4,533         4,533            
Preferred stock dividends (14,459)       (14,459)              
Share-based compensation expense 6,088     6,088                
Exercise of warrants 1,059   $ 74 985                
Exercise of warrants (shares)     74,161                  
Issuance of common stock under share-based-compensation arrangements $ (10,966)   $ 1,019 (11,985)                
Issuance of common stock under share-based-compensation arrangements (shares)     1,018,425                  
Repurchase of shares (shares) 0                      
Ending balance at Dec. 31, 2017 $ 920,964 $ 217,471 $ 31,913 422,096 258,076 (359) (8,233)          
Ending balance, preferred stock (shares) at Dec. 31, 2017 9,000,000 9,000,000                    
Ending balance, common stock (shares) at Dec. 31, 2017 31,382,503   31,382,503                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income $ 71,695       71,695              
Other comprehensive income (loss) (20,965)         (20,965)            
Preferred stock dividends (14,459)       (14,459)              
Share-based compensation expense 8,605     8,605                
Exercise of warrants 112   $ 5 107                
Exercise of warrants (shares)     5,242                  
Issuance of common stock under share-based-compensation arrangements $ 3,840   $ 334 3,506                
Issuance of common stock under share-based-compensation arrangements (shares)     334,483                  
Repurchase of shares (shares) (719,200)   (719,200)                  
Repurchase of shares $ (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 9,000,000                    
Ending balance, common stock (shares) at Dec. 31, 2018 31,003,028   31,003,028                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Cumulative effect adjustment | Accounting Standards Update 2018-02 $ 0       298 (298)            
Cumulative effect adjustment | Accounting Standards Update 2016-01 $ 0       $ 1,041 $ (1,041)