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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, 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 24,142       24,142    
Other comprehensive income (loss) (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          
Ending balance, common stock (shares) at Mar. 31, 2018     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]              
Reclassification of the income tax effects of the Tax Cuts and Jobs Act and net unrealized gains on equity securities from accumulated other comprehensive loss | Accounting Standards Update 2018-02 0       298 (298)  
Reclassification of the income tax effects of the Tax Cuts and Jobs Act and net unrealized gains on equity securities from accumulated other comprehensive loss | Accounting Standards Update 2016-01 $ 0       1,041 (1,041)  
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 15,440       15,440    
Other comprehensive income (loss) 7,744         7,744  
Preferred stock dividends (3,615)       (3,615)    
Share-based compensation expense 2,109     2,109      
Issuance of common stock under share-based compensation arrangements (shares)     159,378        
Issuance of common stock under share-based compensation arrangements 450   $ 160 290      
Repurchase of common shares (shares)     (31,159)        
Repurchase of common shares $ (571)           (571)
Ending balance, preferred stock (shares) at Mar. 31, 2019 9,000,000 9,000,000          
Ending balance, common stock (shares) at Mar. 31, 2019 31,131,247   31,131,247        
Ending balance at Mar. 31, 2019 $ 978,373 $ 217,471 $ 32,412 $ 436,713 $ 328,476 $ (14,919) $ (21,780)