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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, 2021	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2018	Sep. 30, 2021	Sep. 30, 2020
Cash Transactions:
Interest paid					$ 90,651	$ 179,163
Income taxes paid, net					88,614	89,858
Operating lease payments					10,878	10,077
Noncash Transactions:
Loans charged-off to the allowance for credit losses	$ 12,289	$ 15,029			39,319	35,724
Loans foreclosed upon and transferred to other real estate owned					798	3,435
Loans foreclosed upon and transferred to other assets					0	25
Available-for-sale securities transferred to held-to-maturity portfolio			$ 873,600	$ 179,800	0	873,613
Right of use assets recognized during the period in exchange for lease obligations					$ 8,745	$ 5,269

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