Supplemental Disclosure for Statement of Cash Flows (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Supplemental disclosures of cash flow information:
Interest paid	$ 468,723	$ 686,126
Net income taxes paid	52,221	94,033
Operating cash flows from operating leases	38,039	40,751
Operating cash flows from finance leases	404	463
Financing cash flows from finance leases	1,266	1,181
Supplemental schedule of noncash activities:
Transfer of loans and loans held for sale to OREO	6,877	25,067
Transfer of loans to loans held for sale	0	1,196,883
Right-of-use assets obtained in exchange for lease obligations- operating leases	29,726	29,901
Cash and cash equivalents	15,076,845	6,473,599	$ 6,938,698
Restricted cash in other assets	284,176	165,584
Total cash, cash equivalents and restricted cash shown in the statement of cash flows	$ 15,361,021	$ 6,639,183	$ 7,156,689	$ 3,501,380