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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 Loss
Treasury Stock
Beginning balance, preferred stock (shares) at Dec. 31, 2016   9,000,000          
Beginning balance, common stock (shares) at Dec. 31, 2016     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 (loss) 25,747       25,747    
Other comprehensive income 20         20  
Preferred stock dividends (3,615)       (3,615)    
Share-based compensation expense 1,413     1,413      
Exercise of warrants (shares)     43,974        
Exercise of warrants 420   $ 44 376      
Issuance of common stock under share-based compensation arrangements (shares)     302,436        
Issuance of common stock under share-based compensation arrangements (40)   $ 303 (343)      
Ending balance, preferred stock (shares) at Mar. 31, 2017   9,000,000          
Ending balance, common stock (shares) at Mar. 31, 2017     30,636,327        
Ending balance at Mar. 31, 2017 879,817 $ 217,471 $ 31,167 428,454 215,830 (4,872) (8,233)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2018-02 0       298 (298)  
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-01 $ 0       1,041 (1,041)  
Beginning balance, preferred stock (shares) at Dec. 31, 2017 9,000,000 9,000,000          
Beginning balance, common stock (shares) at Dec. 31, 2017 30,820,177   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 (loss) 24,142       24,142    
Other comprehensive income (24,490)         (24,490)  
Preferred stock dividends (3,615)       (3,615)    
Share-based compensation expense 1,786     1,786      
Exercise of warrants (shares)     5,242        
Exercise of warrants 112   $ 5 107      
Issuance of common stock under share-based compensation arrangements (shares)     78,526        
Issuance of common stock under share-based compensation arrangements $ 189   $ 79 110      
Ending balance, preferred stock (shares) at Mar. 31, 2018 9,000,000 9,000,000          
Ending balance, common stock (shares) at Mar. 31, 2018 31,466,271   31,466,271        
Ending balance at Mar. 31, 2018 $ 919,088 $ 217,471 $ 31,997 $ 424,099 $ 279,942 (26,188) $ (8,233)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-01           $ (1,041)