Condensed Consolidated Statements of Cash Flows $ in Thousands	6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)
Cash flows from operating activities:
Net earnings (loss)	$ 330,918	$ (1,399,907)
Goodwill impairment	0	1,470,000
Depreciation and amortization	25,564	22,124
Amortization of net premiums on securities available-for-sale	16,561	5,591
Amortization of intangible assets	5,968	7,830
Amortization of operating lease ROU assets	15,215	14,662
Provision for credit losses	(136,000)	232,000
Gain on sale of foreclosed assets	(214)	(112)
Provision for losses on foreclosed assets	14	110
Gain on sale of loans and leases	(1,561)	(433)
(Gain) loss on sale of premises and equipment	(58)	187
Gain on sale of securities	(101)	(7,897)
Gain on BOLI death benefit	51	0
Unrealized (gain) loss on derivatives and foreign currencies, net	(995)	564
Earned stock compensation	15,406	12,783
Decrease in other assets	22,808	8,393
Decrease in accrued interest payable and other liabilities	(62,869)	(91,873)
Net cash provided by operating activities	230,605	274,022
Cash flows from investing activities:
Net increase in loans and leases	(477,874)	(887,247)
Proceeds from sales of loans and leases	126,366	3,522
Proceeds from maturities and paydowns of securities available-for-sale	435,761	170,245
Proceeds from sales of securities available-for-sale	44,652	144,997
Purchases of securities available-for-sale	(2,497,439)	(274,824)
Net purchases of Federal Home Loan Bank stock	0	23,674
Proceeds from sales of foreclosed assets	1,647	769
Purchases of premises and equipment, net	(4,547)	(9,772)
Proceeds from sales of premises and equipment	95	2
Proceeds from BOLI death benefit	1,188	761
Net decrease in equipment leased to others under operating leases	12,953	15,147
Net cash used in investing activities	(2,480,288)	(812,726)
Cash flows from financing activities:
Net increase in noninterest-bearing deposits	2,021,120	1,387,698
Net increase in interest-bearing deposits	2,647,858	2,309,298
Net decrease in borrowings	(48,585)	(1,699,008)
Common stock repurchased and restricted stock surrendered	394,308	0
Common stock repurchased and restricted stock surrendered	(8,084)	(75,061)
Cash dividends paid	(59,503)	(100,711)
Net cash provided by financing activities	4,947,114	1,822,216
Net increase in cash, cash equivalents, and restricted cash	2,697,431	1,283,512
Cash, cash equivalents, and restricted cash, beginning of period	3,160,661	637,624
Cash, cash equivalents, and restricted cash, end of period	5,858,092	1,921,136
Supplemental disclosures of cash flow information:
Cash paid for interest	24,683	68,390
Cash paid for income taxes	74,147	3,850
Loans transferred to foreclosed assets	647	1,776
Transfers from loans held for investment to loans held for sale	25,554	$ 0
Liabilities	$ 31,021,306