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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($)
$ in Thousands
Total
Preferred Stock
Common Stock
Additional Paid-in Capital
Retained Earnings
AOCI Attributable to Parent
Accounting Standards Update 2016-13
Accounting Standards Update 2016-13
Retained Earnings
Common Stock, Dividends, Per Share, Cash Paid $ 0.16              
Balance at Dec. 31, 2019 $ 4,355,748   $ 76,564 $ 3,064,467 $ 1,184,183 $ 30,534    
Balance (in shares) at Dec. 31, 2019     76,564,000          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Exercise of employee common stock options & related tax benefits 5   $ 1 4        
Exercise of employee common stock options and related tax benefits (in shares)     1,000          
Common dividends paid (12,442)       (12,442)      
Repurchase of common stock (50,790)   $ (1,015) (49,775)        
Repurchase of common stock (in shares)     (1,015,000)          
Issuance of restricted common shares, net of forfeitures 0   $ 198 (198)        
Issuance of restricted common shares, net of forfeitures (in shares)     198,000          
Issuance of common stock pursuant to restricted stock unit agreement, net of shares withheld for taxes & related tax benefits (2,468)   $ 84 (2,552)        
Issuance of common stock pursuant to restricted stock unit agreement, net of shares withheld for taxes and related tax benefit (in shares)     84,000          
Restricted shares withheld for taxes & related benefits (1,958)   $ (32) (1,926)        
Restricted shares withheld for taxes (in shares)     (32,000)          
Stock-based compensation expense 5,501     5,501        
Net income 28,356       28,356      
Cumulative effect of change in accounting principle             $ (31,796) $ (31,796)
Other comprehensive income (loss) 94,972         94,972    
Balance at Mar. 31, 2020 4,385,128 $ 0 $ 75,800 3,015,521 1,168,301 125,506    
Balance (in shares) at Mar. 31, 2020     75,800,000          
Balance at Dec. 31, 2019 4,355,748   $ 76,564 3,064,467 1,184,183 30,534    
Balance (in shares) at Dec. 31, 2019     76,564,000          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Stock-based compensation expense 9,649              
Net income 90,800              
Other comprehensive income (loss) 133,992              
Balance at Jun. 30, 2020 $ 4,695,647 217,632 $ 75,836 3,019,286 1,218,367 164,526    
Balance (in shares) at Jun. 30, 2020     75,836,000          
Common Stock, Dividends, Per Share, Cash Paid $ 0.16              
Balance at Mar. 31, 2020 $ 4,385,128 0 $ 75,800 3,015,521 1,168,301 125,506    
Balance (in shares) at Mar. 31, 2020     75,800,000          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Issuance of preferred stock, net of issuance costs 217,632 217,632            
Exercise of employee common stock options & related tax benefits 225   $ 9 216        
Exercise of employee common stock options and related tax benefits (in shares)     9,000          
Common dividends paid (12,378)       (12,378)      
Issuance of restricted common shares, net of forfeitures 0   $ 38 (38)        
Issuance of restricted common shares, net of forfeitures (in shares)     38,000          
Issuance of common stock pursuant to restricted stock unit agreement, net of shares withheld for taxes & related tax benefits 19   $ 2 (21)        
Issuance of common stock pursuant to restricted stock unit agreement, net of shares withheld for taxes and related tax benefit (in shares)     2,000          
Restricted shares withheld for taxes & related benefits (553)   $ (13) (540)        
Restricted shares withheld for taxes (in shares)     (13,000)          
Stock-based compensation expense 4,148     4,148        
Net income 62,444       62,444      
Other comprehensive income (loss) 39,020         39,020    
Balance at Jun. 30, 2020 $ 4,695,647 217,632 $ 75,836 3,019,286 1,218,367 164,526    
Balance (in shares) at Jun. 30, 2020     75,836,000          
Common Stock, Dividends, Per Share, Cash Paid $ 0.18              
Preferred Stock, Dividends, Per Share, Cash Paid $ 16.88              
Balance at Dec. 31, 2020 $ 4,904,611 217,126 $ 75,850 3,028,063 1,407,723 175,849    
Balance (in shares) at Dec. 31, 2020     75,850,000          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Preferred dividends paid (3,798)       (3,798)      
Exercise of employee common stock options & related tax benefits 304   $ 13 291        
Exercise of employee common stock options and related tax benefits (in shares)     13,000          
Common dividends paid (13,902)       (13,902)      
Issuance of restricted common shares, net of forfeitures 0   $ 172 (172)        
Issuance of restricted common shares, net of forfeitures (in shares)     172,000          
Issuance of common stock pursuant to restricted stock unit agreement, net of shares withheld for taxes & related tax benefits (3,762)   $ 86 (3,848)        
Issuance of common stock pursuant to restricted stock unit agreement, net of shares withheld for taxes and related tax benefit (in shares)     86,000          
Restricted shares withheld for taxes & related benefits (2,456)   $ (34) (2,422)        
Restricted shares withheld for taxes (in shares)     (34,000)          
Stock-based compensation expense 5,399     5,399        
Net income 125,428       125,428      
Other comprehensive income (loss) (52,301)         (52,301)    
Balance at Mar. 31, 2021 4,959,523 217,126 $ 76,087 3,027,311 1,515,451 123,548    
Balance (in shares) at Mar. 31, 2021     76,087,000          
Balance at Dec. 31, 2020 4,904,611 217,126 $ 75,850 3,028,063 1,407,723 175,849    
Balance (in shares) at Dec. 31, 2020     75,850,000          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Stock-based compensation expense 11,068              
Net income 257,218              
Other comprehensive income (loss) (29,750)              
Balance at Jun. 30, 2021 $ 5,101,231 217,126 $ 76,088 3,032,338 1,629,580 146,099    
Balance (in shares) at Jun. 30, 2021     76,088,000          
Common Stock, Dividends, Per Share, Cash Paid $ 0.18              
Preferred Stock, Dividends, Per Share, Cash Paid $ 16.88              
Balance at Mar. 31, 2021 $ 4,959,523 217,126 $ 76,087 3,027,311 1,515,451 123,548    
Balance (in shares) at Mar. 31, 2021     76,087,000          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Preferred dividends paid (3,798)       (3,798)      
Exercise of employee common stock options & related tax benefits 100   $ 5 95        
Exercise of employee common stock options and related tax benefits (in shares)     5,000          
Common dividends paid (13,863)       (13,863)      
Issuance of restricted common shares, net of forfeitures 0   $ 3 (3)        
Issuance of restricted common shares, net of forfeitures (in shares)     3,000          
Issuance of common stock pursuant to restricted stock unit agreement, net of shares withheld for taxes & related tax benefits 2   $ 1 (3)        
Issuance of common stock pursuant to restricted stock unit agreement, net of shares withheld for taxes and related tax benefit (in shares)     1,000          
Restricted shares withheld for taxes & related benefits (739)   $ (8) (731)        
Restricted shares withheld for taxes (in shares)     (8,000)          
Stock-based compensation expense 5,669     5,669        
Net income 131,790       131,790      
Other comprehensive income (loss) 22,551         22,551    
Balance at Jun. 30, 2021 $ 5,101,231 $ 217,126 $ 76,088 $ 3,032,338 $ 1,629,580 $ 146,099    
Balance (in shares) at Jun. 30, 2021     76,088,000