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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, Common
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     34 1,325      
Stock purchase and compensation plans     622 20,567      
Net income $ 138,375       138,375    
Dividends to preferred stockholders         (6,900)    
Dividends to common stockholders         (51,184)    
Other comprehensive income (loss) (640,110)         (640,110)  
Acquisition of treasury stock - share repurchase authorization             (12,423)
Acquisition of treasury stock - shares acquired related to employee-share based compensation plans             (5,658)
End of period at Sep. 30, 2022 $ 2,427,533 $ 200,000 209,558 486,239 2,683,763 (525,011) (627,016)
Dividends declared per preferred share (in dollars per share) $ 862.50            
Dividends declared per common share (in dollars per share) $ 0.84            
Issuance of preferred stock, shares   0          
Common stock, shares outstanding, beginning of period at Dec. 31, 2021 60,184,382            
Dividend reinvestment plan, shares 17,152            
Stock purchase and compensation plan, shares 310,760            
Acquisition of treasury stock, share repurchase authorization, shares (165,159)            
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans, shares (73,644)            
Common stock, shares outstanding, end of period at Sep. 30, 2022 60,273,491            
Preferred stock, shares outstanding 8,000            
Beginning of period at Jun. 30, 2022   $ 200,000 209,506 481,380 2,660,584 (336,370) (621,010)
Issuance of preferred stock   0          
Dividend reinvestment plan     11 438      
Stock purchase and compensation plans     41 4,421      
Net income $ 42,525       42,525    
Dividends to preferred stockholders         (2,300)    
Dividends to common stockholders         (17,046)    
Other comprehensive income (loss) (188,641)         (188,641)  
Acquisition of treasury stock - share repurchase authorization             (5,931)
Acquisition of treasury stock - shares acquired related to employee-share based compensation plans             (75)
End of period at Sep. 30, 2022 $ 2,427,533 $ 200,000 209,558 486,239 2,683,763 (525,011) (627,016)
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 Jun. 30, 2022 60,327,734            
Dividend reinvestment plan, shares 5,647            
Stock purchase and compensation plan, shares 20,073            
Acquisition of treasury stock, share repurchase authorization, shares (79,100)            
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans, shares (863)            
Common stock, shares outstanding, end of period at Sep. 30, 2022 60,273,491            
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     27 1,335      
Stock purchase and compensation plans     623 22,031      
Net income 240,390       240,390    
Dividends to preferred stockholders         (6,900)    
Dividends to common stockholders         (55,016)    
Other comprehensive income (loss) (77,827)         (77,827)  
Acquisition of treasury stock - share repurchase authorization             0
Acquisition of treasury stock - shares acquired related to employee-share based compensation plans             (7,804)
End of period at Sep. 30, 2023 $ 2,644,423 $ 200,000 210,344 516,854 2,928,177 (575,869) (635,083)
Dividends declared per preferred share (in dollars per share) $ 862.50            
Dividends declared per common share (in dollars per share) $ 0.90            
Issuance of preferred stock, shares   0          
Common stock, shares outstanding, beginning of period at Dec. 31, 2022 60,338,900            
Dividend reinvestment plan, shares 13,677            
Stock purchase and compensation plan, shares 311,214            
Acquisition of treasury stock, share repurchase authorization, shares 0            
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans, shares (77,430)            
Common stock, shares outstanding, end of period at Sep. 30, 2023 60,586,361            
Preferred stock, shares outstanding 8,000            
Beginning of period at Jun. 30, 2023   $ 200,000 210,296 512,040 2,859,569 (475,722) (634,791)
Issuance of preferred stock   0          
Dividend reinvestment plan     8 427      
Stock purchase and compensation plans     40 4,387      
Net income $ 89,208       89,208    
Dividends to preferred stockholders         (2,300)    
Dividends to common stockholders         (18,300)    
Other comprehensive income (loss) (100,147)         (100,147)  
Acquisition of treasury stock - share repurchase authorization             0
Acquisition of treasury stock - shares acquired related to employee-share based compensation plans             (292)
End of period at Sep. 30, 2023 $ 2,644,423 $ 200,000 $ 210,344 $ 516,854 $ 2,928,177 $ (575,869) $ (635,083)
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 Jun. 30, 2023 60,565,483            
Dividend reinvestment plan, shares 4,362            
Stock purchase and compensation plan, shares 19,475            
Acquisition of treasury stock, share repurchase authorization, shares 0            
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans, shares (2,959)            
Common stock, shares outstanding, end of period at Sep. 30, 2023 60,586,361            
Preferred stock, shares outstanding 8,000