Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Payments to Acquire Businesses, Gross	$ (121,909)	$ 0
Net earnings (loss)	150,406	(1,433,111)
Goodwill impairment	0	1,470,000
Depreciation and amortization	12,924	10,914
Amortization of net premiums on securities available-for-sale	7,575	2,643
Amortization of intangible assets	3,079	3,948
Amortization of operating lease ROU assets	7,548	7,196
Provision for credit losses	(48,000)	112,000
Gain on sale of foreclosed assets	(73)	(52)
Provision for losses on foreclosed assets	14	105
Gain on sale of loans and leases	(139)	(87)
(Gain) loss on sale of premises and equipment	(28)	77
Gain on sale of securities	(101)	(182)
Unrealized (gain) loss on derivatives and foreign currencies, net	(546)	264
Earned stock compensation	6,417	6,494
Decrease in other assets	60,160	4,206
Decrease in accrued interest payable and other liabilities	(52,533)	(68,841)
Net cash provided by operating activities	146,703	115,574
Cash flows from investing activities:
Net decrease (increase) in loans and leases	68,916	(923,353)
Proceeds from sales of loans and leases	72,780	87
Proceeds from maturities and paydowns of securities available-for-sale	200,367	80,521
Proceeds from sales of securities available-for-sale	44,652	14,948
Purchases of securities available-for-sale	(1,050,217)	(41,405)
Net purchases of Federal Home Loan Bank stock	0	(13,320)
Proceeds from sales of foreclosed assets	435	462
Purchases of premises and equipment, net	(1,936)	(4,304)
Proceeds from sales of premises and equipment	64	2
Proceeds from BOLI death benefit	0	380
Net (increase) decrease in equipment leased to others under operating leases	(4,289)	10,905
Net cash used in investing activities	(791,137)	(875,077)
Cash flows from financing activities:
Net increase in noninterest-bearing deposits	1,786,655	266,932
Net increase in interest-bearing deposits	1,458,939	75,881
Net (decrease) increase in borrowings	(35,460)	535,992
Common stock repurchased and restricted stock surrendered	(1,908)	(73,460)
Cash dividends paid	(29,587)	(71,206)
Net cash provided by financing activities	3,178,639	734,139
Net increase (decrease) in cash, cash equivalents, and restricted cash	2,534,205	(25,364)
Cash, cash equivalents, and restricted cash, beginning of period	3,160,661	637,624
Cash, cash equivalents, and restricted cash, end of period	5,694,866	612,260
Supplemental disclosures of cash flow information:
Cash paid for interest	12,421	43,820
Cash paid for income taxes	2,706	2,019
Loans transferred to foreclosed assets	647	1,776
Transfers from loans held for investment to loans held for sale	25,554	$ 0
Liabilities	$ 29,202,396