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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   44 1,216            
Stock purchase and compensation plans   911 19,137            
Net income $ 119,294     119,294          
Dividends to preferred stockholders       0          
Dividends to common stockholders       (41,661)          
Other comprehensive (loss) income 105,340           105,340    
Acquisition of treasury stock - shares acquired related to employee-share based compensation plans               (7,039)  
End of period at Sep. 30, 2020 $ 2,393,613 207,923 438,874 2,159,597     187,090 (599,871) $ 0
Dividends declared per share to preferred stockholders $ 0                
Dividends declared per share to common stockholders $ 0.69                
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 21,900                
Stock purchase and compensation plan, shares 455,537                
Acquisition of treasury stock, share repurchase authorization 0                
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans (103,888)                
Common stock, shares outstanding, end of period at Sep. 30, 2020 59,834,702                
Preferred Stock, Shares Outstanding 0                
Beginning of year at Jun. 30, 2020   207,875 435,019 2,103,629 0 2,103,629 151,966 (599,814) $ 0
Issuance of preferred stock                 0
Dividend reinvestment plan   14 401            
Stock purchase and compensation plans   34 3,454            
Net income $ 69,875     69,875          
Dividends to preferred stockholders       0          
Dividends to common stockholders       (13,907)          
Other comprehensive (loss) income 35,124           35,124    
Acquisition of treasury stock - share repurchase authorization               0  
Acquisition of treasury stock - shares acquired related to employee-share based compensation plans               (57)  
End of period at Sep. 30, 2020 $ 2,393,613 207,923 438,874 2,159,597     187,090 (599,871) $ 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 Jun. 30, 2020 59,811,742                
Dividend reinvestment plan, shares 7,026                
Stock purchase and compensation plan, shares 16,936                
Acquisition of treasury stock, share repurchase authorization 0                
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans (1,002)                
Common stock, shares outstanding, end of period at Sep. 30, 2020 59,834,702                
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   34 1,261            
Stock purchase and compensation plans   678 17,897            
Net income 304,858     304,858          
Dividends to preferred stockholders       (7,053)          
Dividends to common stockholders       (45,532)          
Other comprehensive (loss) income (79,962)           (79,962)    
Acquisition of treasury stock - share repurchase authorization (3,400)             (3,404)  
Acquisition of treasury stock - shares acquired related to employee-share based compensation plans               (5,570)  
End of period at Sep. 30, 2021 $ 2,922,096 208,778 458,143 2,523,810     140,224 (608,859) $ 200,000
Dividends declared per share to preferred stockholders $ 881.67                
Dividends declared per share to common stockholders $ 0.75                
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 17,152                
Stock purchase and compensation plan, shares 339,061                
Acquisition of treasury stock, share repurchase authorization (52,781)                
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans (85,700)                
Common stock, shares outstanding, end of period at Sep. 30, 2021 60,123,535                
Preferred Stock, Shares Outstanding 8,000                
Beginning of year at Jun. 30, 2021   208,742 454,459 2,467,596 $ 0 $ 2,467,596 169,371 (608,801) $ 200,000
Issuance of preferred stock                 0
Dividend reinvestment plan   10 416            
Stock purchase and compensation plans   26 3,268            
Net income $ 73,705     73,705          
Dividends to preferred stockholders       (2,300)          
Dividends to common stockholders       (15,191)          
Other comprehensive (loss) income (29,147)           (29,147)    
Acquisition of treasury stock - share repurchase authorization               0  
Acquisition of treasury stock - shares acquired related to employee-share based compensation plans               (58)  
End of period at Sep. 30, 2021 $ 2,922,096 $ 208,778 $ 458,143 $ 2,523,810     $ 140,224 $ (608,859) $ 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 Jun. 30, 2021 60,106,236                
Dividend reinvestment plan, shares 5,096                
Stock purchase and compensation plan, shares 12,946                
Acquisition of treasury stock, share repurchase authorization 0                
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans (743)                
Common stock, shares outstanding, end of period at Sep. 30, 2021 60,123,535                
Preferred Stock, Shares Outstanding 8,000