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Consolidated Statements of Shareholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
 [1]
Preferred Stock
Common Stock
Additional Paid-In Capital
Retained Earnings
Retained Earnings
Cumulative Effect, Period of Adoption, Adjustment
 [1]
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Beginning Balance at Dec. 31, 2019 $ 2,342,176 $ (43,807) $ 0 $ 556,110 $ 1,499,681 $ 1,079,391 $ (43,807) $ (137) $ (792,869)
Beginning Balance (in shares) at Dec. 31, 2019     0 164,218          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net Income 26,047         26,047      
Other comprehensive income 18,445             18,445  
Stock issued (in shares)       125          
Common stock issued 2,001     $ 133 889       979
Stock-based compensation awards 1,619       1,619        
Acquisition of treasury stock (in shares)       (2,908)          
Acquisition of treasury stock (in shares) (39,748)               (39,748)
Common stock cash dividends (20,985)         (20,985)      
Ending Balance at Mar. 31, 2020 2,285,748   $ 0 $ 556,243 1,502,189 1,040,646   18,308 (831,638)
Ending Balance (in shares) at Mar. 31, 2020     0 161,435          
Beginning Balance at Dec. 31, 2020 2,616,828   $ 192,878 $ 557,917 1,508,117 1,120,781   65,091 (827,956)
Beginning Balance (in shares) at Dec. 31, 2020     200 162,350          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net Income 73,063         73,063      
Other comprehensive income (39,253)             (39,253)  
Stock issued (in shares)       167          
Common stock issued 2,468     $ 199 1,082       1,187
Stock-based compensation awards 1,902       1,902        
Preferred stock dividend (2,591)         (2,591)      
Common stock cash dividends (22,762)         (22,762)      
Ending Balance at Mar. 31, 2021 $ 2,629,655   $ 192,878 $ 558,116 $ 1,511,101 $ 1,168,491   $ 25,838 $ (826,769)
Ending Balance (in shares) at Mar. 31, 2021     200 162,517          
[1] The Corporation adopted ASU 2016-13 "Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses of Financial Instruments on January 1, 2020. See Note 1, "Basis of Presentation" to the Consolidated Financial Statements for further details.