Condensed Consolidated Statements of Cash Flows $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)
Cash flows from operating activities:
Net earnings (loss)	$ 470,914	$ (1,354,404)
Goodwill impairment	0	1,470,000
Depreciation and amortization	38,311	33,303
Amortization of net premiums on securities available-for-sale	28,480	9,994
Amortization of intangible assets	8,858	11,581
Amortization of operating lease ROU assets	22,866	22,080
Provision for credit losses	(156,000)	329,000
Gain on sale of foreclosed assets	(135)	(187)
Provision for losses on foreclosed assets	14	267
Gain on sale of loans and leases	(1,561)	(468)
(Gain) loss on sale of premises and equipment	(5)	309
Gain on sale of securities	(616)	(13,167)
Gain on BOLI death benefit	491	0
Unrealized (gain) loss on derivatives and foreign currencies, net	(804)	494
Earned stock compensation	23,907	19,847
Increase in other assets	(1,516)	(60,450)
Decrease in accrued interest payable and other liabilities	(39,911)	(125,262)
Net cash provided by operating activities	392,311	342,937
Cash flows from investing activities:
Payments to Acquire Businesses, Gross	(123,090)	0
Net increase in loans and leases	(1,485,780)	(269,253)
Proceeds from sales of loans and leases	128,541	6,536
Proceeds from maturities and paydowns of securities available-for-sale	628,988	292,769
Proceeds from sales of securities available-for-sale	121,351	167,267
Purchases of securities available-for-sale	(4,921,557)	(1,085,749)
Net redemptions of Federal Home Loan Bank stock	0	23,674
Proceeds from sales of foreclosed assets	1,846	983
Purchases of premises and equipment, net	(15,078)	(11,013)
Proceeds from sales of premises and equipment	95	4
Proceeds from BOLI death benefit	4,143	761
Net (increase) decrease in equipment leased to others under operating leases	(16,346)	16,860
Net cash used in investing activities	(5,676,887)	(857,161)
Cash flows from financing activities:
Net increase in noninterest-bearing deposits	3,650,640	2,105,033
Net increase in interest-bearing deposits	1,931,049	2,629,213
Net decrease in borrowings	(55,210)	(1,699,008)
Common stock repurchased and restricted stock surrendered	394,308	0
Common stock repurchased and restricted stock surrendered	(8,200)	(75,132)
Cash dividends paid	(89,474)	(130,310)
Net cash provided by financing activities	5,823,113	2,829,796
Net increase in cash, cash equivalents, and restricted cash	538,537	2,315,572
Cash, cash equivalents, and restricted cash, beginning of period	3,160,661	637,624
Cash, cash equivalents, and restricted cash, end of period	3,699,198	2,953,196
Supplemental disclosures of cash flow information:
Cash paid for interest	35,505	86,060
Cash paid for income taxes	94,770	92,953
Loans transferred to foreclosed assets	1,062	14,370
Transfers from loans held for investment to loans held for sale	25,554	$ 0
Liabilities	$ 31,967,242