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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Preferred Stock [Member]
Common Stock [Member]
Additional paid-in capital [Member]
Retained Earnings [Member]
Accumulated other comprehensive income (loss) [Member]
Treasury stock [Member]
Preferred stock, shares outstanding 8,000            
Beginning of period at Dec. 31, 2021   $ 200,000 $ 208,902 $ 464,347 $ 2,603,472 $ 115,099 $ (608,935)
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 income (loss) (451,469)         (451,469)  
Acquisition of treasury stock - share repurchase authorization             (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 $ 200,000 209,506 481,380 2,660,584 (336,370) (621,010)
Dividends declared per preferred share (in dollars per share) $ 575.00            
Dividends declared per common share (in dollars per share) $ 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   $ 200,000 209,336 472,790 2,640,437 (129,795) (614,527)
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 income (loss) (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 $ 200,000 209,506 481,380 2,660,584 (336,370) (621,010)
Dividends declared per preferred share (in dollars per share) $ 287.50            
Dividends declared per common share (in dollars per share) $ 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            
Preferred stock, shares outstanding 8,000            
Beginning of period at Dec. 31, 2022 $ 2,527,564 $ 200,000 209,694 493,488 2,749,703 (498,042) (627,279)
Issuance of preferred stock   0          
Dividend reinvestment plan     19 908      
Stock purchase and compensation plans     583 17,644      
Net income 151,182       151,182    
Dividends to preferred stockholders         (4,600)    
Dividends to common stockholders         (36,716)    
Other comprehensive income (loss) 22,320         22,320  
Acquisition of treasury stock - share repurchase authorization             0
Acquisition of treasury stock - shares acquired related to employee-share based compensation plans             (7,512)
End of period at Jun. 30, 2023 $ 2,671,392 $ 200,000 210,296 512,040 2,859,569 (475,722) (634,791)
Dividends declared per preferred share (in dollars per share) $ 575.00            
Dividends declared per common share (in dollars per share) $ 0.60            
Issuance of preferred stock, shares   0          
Common stock, shares outstanding, beginning of period at Dec. 31, 2022 60,338,900            
Dividend reinvestment plan, shares 9,315            
Stock purchase and compensation plan, shares 291,739            
Acquisition of treasury stock, share repurchase authorization, shares 0            
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans, shares (74,471)            
Common stock, shares outstanding, end of period at Jun. 30, 2023 60,565,483            
Preferred stock, shares outstanding 8,000            
Beginning of period at Mar. 31, 2023   $ 200,000 210,149 502,713 2,821,613 (430,349) (634,722)
Issuance of preferred stock   0          
Dividend reinvestment plan     10 449      
Stock purchase and compensation plans     137 8,878      
Net income $ 58,608       58,608    
Dividends to preferred stockholders         (2,300)    
Dividends to common stockholders         (18,352)    
Other comprehensive income (loss) (45,373)         (45,373)  
Acquisition of treasury stock - share repurchase authorization             0
Acquisition of treasury stock - shares acquired related to employee-share based compensation plans             (69)
End of period at Jun. 30, 2023 $ 2,671,392 $ 200,000 $ 210,296 $ 512,040 $ 2,859,569 $ (475,722) $ (634,791)
Dividends declared per preferred share (in dollars per share) $ 287.50            
Dividends declared per common share (in dollars per share) $ 0.30            
Issuance of preferred stock, shares   0          
Common stock, shares outstanding, beginning of period at Mar. 31, 2023 60,492,586            
Dividend reinvestment plan, shares 4,665            
Stock purchase and compensation plan, shares 68,923            
Acquisition of treasury stock, share repurchase authorization, shares 0            
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans, shares (691)            
Common stock, shares outstanding, end of period at Jun. 30, 2023 60,565,483            
Preferred stock, shares outstanding 8,000