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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional paid-in capital [Member]
Retained Earnings [Member]
Accumulated other comprehensive income (loss) [Member]
Treasury stock [Member]
Preferred Stock [Member]
Preferred Stock, Shares Outstanding 8,000            
Beginning of period at Dec. 31, 2020   $ 208,066 $ 438,985 $ 2,271,537 $ 220,186 $ (599,885) $ 200,000
Issuance of preferred stock             0
Dividend reinvestment plan   24 845        
Stock purchase and compensation plans   652 14,629        
Net income $ 231,153     231,153      
Dividends to preferred stockholders       (4,753)      
Dividends to common stockholders       (30,341)      
Other comprehensive (loss) income (50,815)       (50,815)    
Acquisition of treasury stock - share repurchase authorization           (3,404)  
Acquisition of treasury stock - shares acquired related to employee-share based compensation plans           (5,512)  
End of period at Jun. 30, 2021 $ 2,891,367 208,742 454,459 2,467,596 169,371 (608,801) $ 200,000
Dividends declared per share to preferred stockholders $ 594.17            
Dividends declared per share to common stockholders $ 0.50            
Issuance of preferred stock, shares             0
Common stock, shares outstanding, beginning of period at Dec. 31, 2020 59,905,803            
Dividend reinvestment plan, shares 12,056            
Stock purchase and compensation plan, shares 326,115            
Acquisition of treasury stock, share repurchase authorization, shares (52,781)            
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans, shares (84,957)            
Common stock, shares outstanding, end of period at Jun. 30, 2021 60,106,236            
Preferred Stock, Shares Outstanding 8,000            
Beginning of period at Mar. 31, 2021   208,576 446,410 2,363,189 134,600 (608,730) $ 200,000
Issuance of preferred stock             0
Dividend reinvestment plan   11 416        
Stock purchase and compensation plans   155 7,633        
Net income $ 121,883     121,883      
Dividends to preferred stockholders       (2,300)      
Dividends to common stockholders       (15,176)      
Other comprehensive (loss) income 34,771       34,771    
Acquisition of treasury stock - share repurchase authorization           0  
Acquisition of treasury stock - shares acquired related to employee-share based compensation plans           (71)  
End of period at Jun. 30, 2021 $ 2,891,367 208,742 454,459 2,467,596 169,371 (608,801) $ 200,000
Dividends declared per share to preferred stockholders $ 287.50            
Dividends declared per share to common stockholders $ 0.25            
Issuance of preferred stock, shares             0
Common stock, shares outstanding, beginning of period at Mar. 31, 2021 60,023,883            
Dividend reinvestment plan, shares 5,636            
Stock purchase and compensation plan, shares 77,656            
Acquisition of treasury stock, share repurchase authorization, shares 0            
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans, shares (939)            
Common stock, shares outstanding, end of period at Jun. 30, 2021 60,106,236            
Preferred Stock, Shares Outstanding 8,000            
Preferred Stock, Shares Outstanding 8,000            
Beginning of period at Dec. 31, 2021 $ 2,982,885 208,902 464,347 2,603,472 115,099 (608,935) $ 200,000
Issuance of preferred stock             0
Dividend reinvestment plan   23 887        
Stock purchase and compensation plans   581 16,146        
Net income 95,850     95,850      
Dividends to preferred stockholders       (4,600)      
Dividends to common stockholders       (34,138)      
Other comprehensive (loss) income (451,469)       (451,469)    
Acquisition of treasury stock - share repurchase authorization (6,500)         (6,492)  
Acquisition of treasury stock - shares acquired related to employee-share based compensation plans           (5,583)  
End of period at Jun. 30, 2022 $ 2,594,090 209,506 481,380 2,660,584 (336,370) (621,010) $ 200,000
Dividends declared per share to preferred stockholders $ 575.00            
Dividends declared per share to common stockholders $ 0.56            
Issuance of preferred stock, shares             0
Common stock, shares outstanding, beginning of period at Dec. 31, 2021 60,184,382            
Dividend reinvestment plan, shares 11,505            
Stock purchase and compensation plan, shares 290,687            
Acquisition of treasury stock, share repurchase authorization, shares (86,059)            
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans, shares (72,781)            
Common stock, shares outstanding, end of period at Jun. 30, 2022 60,327,734            
Preferred Stock, Shares Outstanding 8,000            
Beginning of period at Mar. 31, 2022   209,336 472,790 2,640,437 (129,795) (614,527) $ 200,000
Issuance of preferred stock             0
Dividend reinvestment plan   12 444        
Stock purchase and compensation plans   158 8,146        
Net income $ 39,520     39,520      
Dividends to preferred stockholders       (2,300)      
Dividends to common stockholders       (17,073)      
Other comprehensive (loss) income (206,575)       (206,575)    
Acquisition of treasury stock - share repurchase authorization           (6,416)  
Acquisition of treasury stock - shares acquired related to employee-share based compensation plans           (67)  
End of period at Jun. 30, 2022 $ 2,594,090 $ 209,506 $ 481,380 $ 2,660,584 $ (336,370) $ (621,010) $ 200,000
Dividends declared per share to preferred stockholders $ 287.50            
Dividends declared per share to common stockholders $ 0.28            
Issuance of preferred stock, shares             0
Common stock, shares outstanding, beginning of period at Mar. 31, 2022 60,335,472            
Dividend reinvestment plan, shares 5,864            
Stock purchase and compensation plan, shares 72,245            
Acquisition of treasury stock, share repurchase authorization, shares (85,059)            
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans, shares (788)            
Common stock, shares outstanding, end of period at Jun. 30, 2022 60,327,734            
Preferred Stock, Shares Outstanding 8,000