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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
Common Stock
Common Stock
Common Stock
Common Stock
Additional Paid in Capital
Preferred Stock
Preferred Stock
Preferred Stock
Beginning balance at Dec. 31, 2014 $ 443,145 $ 0 $ 27,278 $ 355,822 $ 68,421 $ (122) $ (8,254)          
Beginning balance, preferred stock (shares) at Dec. 31, 2014   0                    
Beginning balance, common stock (shares) at Dec. 31, 2014     26,745,529                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 58,583       58,583              
Other comprehensive income (loss) (7,862)         (7,862)            
Issuance of stock, net of offering costs                     $ 55,569 $ 55,569
Issuance of stock, net of offering costs (shares)                       2,300,000
Preferred stock dividends (2,493)       (2,493)              
Share-based compensation expense 4,862     4,862                
Exercise of warrants 98   $ 8 90                
Exercise of warrants (shares)     7,611                  
Issuance of common stock under share-based-compensation arrangements 2,000   $ 146 1,833     21          
Issuance of common stock under share-based-compensation arrangements (shares)     148,661                  
Ending balance at Dec. 31, 2015 553,902 $ 55,569 $ 27,432 362,607 124,511 (7,984) (8,233)          
Ending balance, preferred stock (shares) at Dec. 31, 2015   2,300,000                    
Ending 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               $ 64,031 $ 2,642 $ 61,389 $ 161,902 $ 161,902
Issuance of stock, net of offering costs (shares)                 2,641,677     6,700,000
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                  
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 9,000,000                    
Ending balance, common stock (shares) at Dec. 31, 2016 30,289,917   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                  
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