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Consolidated Statements of Cash Flows (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2019
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Stockholders equity $ 1,400,776 $ 1,520,983 $ 1,448,008 $ 1,400,776 $ 1,520,983 $ 1,443,433 $ 1,542,683 $ 1,588,678 $ 1,574,329 $ 1,489,387
Allowance for credit losses 5,000 5,000   5,000 5,000       $ 5,000  
Income tax expense $ 12,166 13,141   $ 47,186 51,278          
Income taxes     $ 1,168              
Cumulative Effect of Adoption Adjustment | ASU 2016-13                    
Stockholders equity   (3,832)     (3,832) (3,832)        
Allowance for credit losses   $ 5,000     5,000 5,000        
Income tax expense         $ 1,168 $ 1,168