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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, 2015   2,300,000          
Beginning balance, common stock (shares) at Dec. 31, 2015     26,901,801        
Beginning balance at Dec. 31, 2015 $ 553,902 $ 55,569 $ 27,432 $ 362,607 $ 124,511 $ (7,984) $ (8,233)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 58,875       58,875    
Other comprehensive income 8,758         8,758  
Issuance of stock, net of offering costs (shares)   6,700,000 226,677        
Issuance of stock, net of offering costs 5,677 $ 161,980 $ 227 5,450      
Preferred stock dividends (5,900)       (5,900)    
Share-based compensation expense 4,569     4,569      
Exercise of warrants (shares)     259,851        
Exercise of warrants 1,121   $ 259 862      
Issuance of common stock under share-based compensation arrangements (shares)     155,888        
Issuance of common stock under share-based compensation arrangements 829   $ 156 673      
Ending balance, preferred stock (shares) at Sep. 30, 2016   9,000,000          
Ending balance, common stock (shares) at Sep. 30, 2016     27,544,217        
Ending balance at Sep. 30, 2016 789,811 $ 217,549 $ 28,074 374,161 177,486 774 (8,233)
Beginning balance at Jun. 30, 2016           (427)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 21,207            
Other comprehensive income 1,201            
Ending balance, preferred stock (shares) at Sep. 30, 2016   9,000,000          
Ending balance, common stock (shares) at Sep. 30, 2016     27,544,217        
Ending balance at Sep. 30, 2016 $ 789,811 $ 217,549 $ 28,074 374,161 177,486 774 (8,233)
Beginning balance, preferred stock (shares) at Dec. 31, 2016 9,000,000 9,000,000          
Beginning balance, common stock (shares) at Dec. 31, 2016 30,289,917   30,289,917        
Beginning balance at Dec. 31, 2016 $ 855,872 $ 217,471 $ 30,820 427,008 193,698 (4,892) (8,233)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 57,222       57,222    
Other comprehensive income 5,269         5,269  
Preferred stock dividends (10,844)       (10,844)    
Share-based compensation expense 4,536     4,536      
Exercise of warrants (shares)     50,387        
Exercise of warrants 557   $ 50 507      
Issuance of common stock under share-based compensation arrangements (shares)     447,328        
Issuance of common stock under share-based compensation arrangements $ (1,970)   $ 448 (2,418)      
Ending balance, preferred stock (shares) at Sep. 30, 2017 9,000,000 9,000,000          
Ending balance, common stock (shares) at Sep. 30, 2017 30,787,632   30,787,632        
Ending balance at Sep. 30, 2017 $ 910,642 $ 217,471 $ 31,318 429,633 240,076 377 (8,233)
Beginning balance at Jun. 30, 2017           5,364  
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 7,754            
Other comprehensive income $ (4,987)            
Ending balance, preferred stock (shares) at Sep. 30, 2017 9,000,000 9,000,000          
Ending balance, common stock (shares) at Sep. 30, 2017 30,787,632   30,787,632        
Ending balance at Sep. 30, 2017 $ 910,642 $ 217,471 $ 31,318 $ 429,633 $ 240,076 $ 377 $ (8,233)