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Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2018	Jun. 30, 2021	Jun. 30, 2020
Cash Transactions:
Interest paid					$ 63,683	$ 127,807
Income taxes paid, net					56,073	23,749
Operating lease payments					7,133	6,750
Noncash Transactions:
Loans charged-off to the allowance for credit losses	$ 12,755	$ 9,002			27,029	20,695
Loans foreclosed upon and transferred to other real estate owned					620	2,442
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					$ 4,771	$ 2,928

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