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CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Preferred Stock [Member]
Common Stock [Member]
Additional Paid In Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income [Member]
Total stockholders' equity   $ 36,104 $ 21,745 $ 931,856 $ 830,928 $ (34,390)
Balance at beginning of period at Dec. 31, 2016   36,104 21,745 931,856 830,928 (34,390)
Common stock issued as compensation     43 (43)    
Common stock issued for exercised warrants     0 0    
Common stock withheld for taxes     (39) (2,136)    
Restricted stock grants     109 (109)    
Restricted stock forfeited     (240) 240    
Stock-based compensation       5,423    
Net income $ 42,787       42,787  
Dividends on preferred stock (2,007)       (2,007)  
Amount reclassified from accumulated other comprehensive loss per ASU 2016-1         0  
Other comprehensive income (loss), net of tax 23,480         23,480
Balance at end of period at Sep. 30, 2017 1,853,751 36,104 21,618 935,231 871,708 (10,910)
Total stockholders' equity 1,853,751 36,104 21,745 931,856 830,928 (34,390)
Total stockholders' equity 1,853,751 36,104 21,618 935,231 871,708 (10,910)
Total stockholders' equity 1,869,097 36,104 21,628 936,772 895,208 (20,615)
Balance at beginning of period at Dec. 31, 2017 1,869,097 36,104 21,628 936,772 895,208 (20,615)
Common stock issued as compensation     27 (27)    
Common stock issued for exercised warrants     73 (73)    
Common stock withheld for taxes     (43) (2,778)    
Restricted stock grants     40 (40)    
Restricted stock forfeited     (1) 1    
Stock-based compensation       4,921    
Net income 100,503       100,503  
Dividends on preferred stock (2,007)       (2,007)  
Amount reclassified from accumulated other comprehensive loss per ASU 2016-1         (6)  
Other comprehensive income (loss), net of tax (42,272)         (42,272)
Balance at end of period at Sep. 30, 2018 1,927,415 36,104 21,724 938,776 993,698 (62,887)
Total stockholders' equity 1,927,415 36,104 21,628 936,772 895,208 (20,615)
Total stockholders' equity $ 1,927,415 $ 36,104 $ 21,724 $ 938,776 $ 993,698 $ (62,887)