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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional paid-in capital [Member]
Retained Earnings [Member]
Retained Earnings [Member]
Accounting Standards Update 2016-13 [Member]
Retained Earnings [Member]
Cumulative Effect, Period of Adoption, Adjustment
Accumulated other comprehensive income (loss) [Member]
Treasury stock [Member]
Preferred Stock
Preferred Stock, Shares Outstanding 0                
Beginning of year at Dec. 31, 2019   $ 206,968 $ 418,521 $ 2,080,529 $ 1,435 $ 2,081,964 $ 81,750 $ (592,832) $ 0
Issuance of preferred stock                 0
Dividend reinvestment plan   14 408            
Stock purchase and compensation plans   683 8,399            
Net income $ 15,236     15,236          
Dividends to preferred stockholders       0          
Dividends to common stockholders       (13,860)          
Other comprehensive loss (103,867)           (103,867)    
Acquisition of treasury stock - share repurchase authorization               0  
Acquisition of treasury stock - shares acquired related to employee-share based compensation plans               (6,928)  
End of period at Mar. 31, 2020 $ 2,096,456 207,665 427,328 2,083,340     (22,117) (599,760) $ 0
Dividends declared per share to preferred stockholders $ 0                
Dividends declared per share to common stockholders $ 0.23                
Stock Issued During Period, Shares, New Issues                 0
Common stock, shares outstanding, beginning of period at Dec. 31, 2019 59,461,153                
Dividend reinvestment plan, shares 6,975                
Stock purchase and compensation plan, shares 341,236                
Acquisition of treasury stock, share repurchase authorization 0                
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans (101,819)                
Common stock, shares outstanding, end of period at Mar. 31, 2020 59,707,545                
Preferred Stock, Shares Outstanding 0                
Preferred Stock, Shares Outstanding 8,000                
Beginning of year at Dec. 31, 2020 $ 2,738,889 208,066 438,985 2,271,537 $ 0 $ 2,271,537 220,186 (599,885) $ 200,000
Issuance of preferred stock                 0
Dividend reinvestment plan   13 429            
Stock purchase and compensation plans   497 6,996            
Net income 109,270     109,270          
Dividends to preferred stockholders       (2,453)          
Dividends to common stockholders       (15,165)          
Other comprehensive loss (85,586)           (85,586)    
Acquisition of treasury stock - share repurchase authorization (3,400)             (3,404)  
Acquisition of treasury stock - shares acquired related to employee-share based compensation plans               (5,441)  
End of period at Mar. 31, 2021 $ 2,744,045 $ 208,576 $ 446,410 $ 2,363,189     $ 134,600 $ (608,730) $ 200,000
Dividends declared per share to preferred stockholders $ 306.67                
Dividends declared per share to common stockholders $ 0.25                
Stock Issued During Period, Shares, New Issues                 0
Common stock, shares outstanding, beginning of period at Dec. 31, 2020 59,905,803                
Dividend reinvestment plan, shares 6,420                
Stock purchase and compensation plan, shares 248,459                
Acquisition of treasury stock, share repurchase authorization (52,781)                
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans (84,018)                
Common stock, shares outstanding, end of period at Mar. 31, 2021 60,023,883                
Preferred Stock, Shares Outstanding 8,000