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Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Mar. 31, 2020
Sep. 30, 2018
Sep. 30, 2022
Sep. 30, 2021
Cash Transactions:              
Interest paid           $ 114,326 $ 90,651
Income taxes paid, net           115,090 88,614
Operating lease payments           12,255 10,878
Noncash Transactions:              
Loans charged-off to the allowance for credit losses $ 17,699   $ 12,289     33,384 39,319
Loans foreclosed upon and transferred to other real estate owned           65 798
Available-for-sale securities transferred to held-to-maturity portfolio   $ 1,100,000   $ 873,600 $ 179,800 1,059,737 0
Right of use assets recognized during the period in exchange for lease obligations           $ 31,333 $ 8,745