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Earnings Per Common Share and Stockholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2021
Earnings Per Share [Abstract]  
Schedule of Earnings Per Common Share, Basic and Diluted
The following table sets forth the computation of earnings per common share and earnings per common share - assuming dilution:
Three Months Ended 
 September 30,		Nine Months Ended 
 September 30,
2021202020212020
(Dollars in thousands, except per share data)
Numerator:
Net income available to common stockholders - numerator for earnings per common share$141,947 $661,250 $348,099 $644,207 
Denominator:
Weighted average common shares outstanding92,478,154 91,861,167 94,325,984 91,769,932 
Effect of dilutive securities:
Stock options and deferred compensation agreements237,076 55,926 224,519 85,493 
Restricted stock and restricted stock units328,430 246,179 316,897 215,310 
Denominator for earnings per common share - assuming dilution93,043,660 92,163,272 94,867,400 92,070,735 
Earnings per common share$1.53 $7.20 $3.69 $7.02 
Earnings per common share - assuming dilution$1.53 $7.17 $3.67 $7.00