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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   30 815            
Stock purchase and compensation plans   877 15,683            
Net income $ 49,419     49,419          
Dividends to preferred stockholders       0          
Dividends to common stockholders       (27,754)          
Other comprehensive income (loss) 70,216           70,216    
Acquisition of treasury stock - shares acquired related to employee-share based compensation plans               (6,982)  
End of period at Jun. 30, 2020 $ 2,298,675 207,875 435,019 2,103,629     151,966 (599,814) $ 0
Dividends declared per share to preferred stockholders $ 0                
Dividends declared per share to common stockholders $ 0.46                
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 14,874                
Stock purchase and compensation plan, shares 438,601                
Acquisition of treasury stock, share repurchase authorization 0                
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans (102,886)                
Common stock, shares outstanding, end of period at Jun. 30, 2020 59,811,742                
Preferred Stock, Shares Outstanding 0                
Beginning of year at Mar. 31, 2020   207,665 427,328 2,083,340 0 2,083,340 (22,117) (599,760) $ 0
Issuance of preferred stock                 0
Dividend reinvestment plan   16 407            
Stock purchase and compensation plans   194 7,284            
Net income $ 34,183     34,183          
Dividends to preferred stockholders       0          
Dividends to common stockholders       (13,894)          
Other comprehensive income (loss) 174,083           174,083    
Acquisition of treasury stock - share repurchase authorization               0  
Acquisition of treasury stock - shares acquired related to employee-share based compensation plans               (54)  
End of period at Jun. 30, 2020 $ 2,298,675 207,875 435,019 2,103,629     151,966 (599,814) $ 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 Mar. 31, 2020 59,707,545                
Dividend reinvestment plan, shares 7,899                
Stock purchase and compensation plan, shares 97,365                
Acquisition of treasury stock, share repurchase authorization 0                
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans (1,067)                
Common stock, shares outstanding, end of period at Jun. 30, 2020 59,811,742                
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   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 income (loss) (50,815)           (50,815)    
Acquisition of treasury stock - share repurchase authorization (3,400)             (3,404)  
Acquisition of treasury stock - shares acquired related to employee-share based compensation plans               (5,512)  
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                
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 12,056                
Stock purchase and compensation plan, shares 326,115                
Acquisition of treasury stock, share repurchase authorization (52,781)                
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans (84,957)                
Common stock, shares outstanding, end of period at Jun. 30, 2021 60,106,236                
Preferred Stock, Shares Outstanding 8,000                
Beginning of year at Mar. 31, 2021   208,576 446,410 2,363,189 $ 0 $ 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 income (loss) 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                
Stock Issued During Period, Shares, New Issues                 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 0                
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans (939)                
Common stock, shares outstanding, end of period at Jun. 30, 2021 60,106,236                
Preferred Stock, Shares Outstanding 8,000