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Consolidated Statements of Changes in Shareholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income [Member]
Treasury Stock [Member]
Shares, Outstanding   71,598      
Balance, value at Dec. 31, 2020 $ 2,347,607 $ 1,660,998 $ 575,248 $ 182,195 $ (70,834)
Net income 106,892   106,892    
Other comprehensive income (loss) (85,086)     (85,086)  
Issuance of common stock - employee stock purchase plan, shares   41      
Issuance of common stock - employee stock purchase plan, value $ 1,098 $ 1,098      
Activity in Deferred Compensation Plan, shares 0        
Activity in Deferred Compensation Plan, value $ (8)        
Issuance of common stock - RSAs and RSUs, net of canceled awards, shares   192      
Issuance of common stock - RSAs and RSUs, net of canceled awards, value 6,936 $ 6,936      
Purchase and retirement of common stock, shares   (89)      
Purchase and retirement of common stock, value (4,071) $ (4,071)      
Cash dividends declared on common stock (40,122)   (40,122)    
Balance, value at Jun. 30, 2021 2,333,246 $ 1,664,953 642,018 97,109 (70,834)
Shares, Outstanding   71,739      
Balance, value at Mar. 31, 2021 2,275,063 $ 1,661,129 607,040 77,728 (70,834)
Net income 55,039   55,039    
Other comprehensive income (loss) $ 19,381     19,381  
Activity in Deferred Compensation Plan, shares 0        
Activity in Deferred Compensation Plan, value $ (8) $ (8)      
Issuance of common stock - RSAs and RSUs, net of canceled awards, shares   4      
Issuance of common stock - RSAs and RSUs, net of canceled awards, value 3,908 $ 3,908      
Purchase and retirement of common stock, shares   (1)      
Purchase and retirement of common stock, value (76) $ (76)      
Cash dividends declared on common stock (20,061)   (20,061)    
Balance, value at Jun. 30, 2021 2,333,246 $ 1,664,953 642,018 97,109 (70,834)
Shares, Outstanding   71,742      
Shares, Outstanding   78,511      
Balance, value at Dec. 31, 2021 2,588,742 $ 1,930,187 694,227 35,162 (70,834)
Net income 116,330   116,330    
Other comprehensive income (loss) (419,777)     (419,777)  
Issuance of common stock - employee stock purchase plan, shares   31      
Issuance of common stock - employee stock purchase plan, value 1,017 $ 1,017      
Activity in Deferred Compensation Plan, shares   0      
Activity in Deferred Compensation Plan, value 3 $ 3      
Issuance of common stock - RSAs and RSUs, net of canceled awards, shares   187      
Issuance of common stock - RSAs and RSUs, net of canceled awards, value 7,910 $ 7,910      
Purchase and retirement of common stock, shares   (108)      
Purchase and retirement of common stock, value (3,937) $ (3,937)      
Cash dividends declared on common stock (47,070)   (47,070)    
Balance, value at Jun. 30, 2022 2,243,218 $ 1,935,180 763,487 (384,615) (70,834)
Shares, Outstanding   78,644      
Balance, value at Mar. 31, 2022 2,360,779 $ 1,931,076 728,314 (227,777) (70,834)
Net income 58,808   58,808    
Other comprehensive income (loss) (156,838)     (156,838)  
Activity in Deferred Compensation Plan, shares   0      
Activity in Deferred Compensation Plan, value 2 $ 2      
Issuance of common stock - RSAs and RSUs, net of canceled awards, shares   (23)      
Issuance of common stock - RSAs and RSUs, net of canceled awards, value 4,115 $ 4,115      
Purchase and retirement of common stock, shares   0      
Purchase and retirement of common stock, value (13) $ (13)      
Cash dividends declared on common stock (23,635)   (23,635)    
Balance, value at Jun. 30, 2022 $ 2,243,218 $ 1,935,180 $ 763,487 $ (384,615) $ (70,834)
Shares, Outstanding   78,621