Condensed Consolidated Statements of Cash Flows $ in Thousands	6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)
Cash flows from operating activities:
Net earnings	$ 242,488	$ 330,918
Depreciation and amortization	26,946	25,564
Amortization of net premiums on investment securities	29,742	16,561
Amortization of intangible assets	7,298	5,968
Amortization of operating lease ROU assets	15,100	15,215
Provision for credit losses	11,500	(136,000)
Gain on sale of foreclosed assets	(3,170)	(214)
Provision for losses on foreclosed assets	0	14
Gain on sale of loans and leases	(72)	(1,561)
Gain on sale of premises and equipment	(5)	(58)
Loss (gain) on sale of securities	1,105	(101)
Gain on BOLI death benefit	0	(51)
Unrealized gain on derivatives and foreign currencies, net	(1,330)	(995)
Earned stock compensation	17,255	15,406
(Increase) decrease in other assets	(24,626)	22,808
Decrease in accrued interest payable and other liabilities	(50,662)	(62,869)
Net cash provided by operating activities	271,569	230,605
Cash flows from investing activities:
Cash paid for acquisition, net	0	(123,090)
Net increase in loans and leases	(3,600,769)	(477,874)
Proceeds from sales of loans and leases	41,089	126,366
Proceeds from maturities and paydowns of securities available-for-sale	417,760	435,761
Proceeds from sales of securities available-for-sale	598,415	44,652
Purchases of securities available-for-sale	(374,921)	(2,497,439)
Proceeds from maturities and paydowns of securities held-to-maturity	82	0
Net purchases of Federal Home Loan Bank stock	(15,960)	0
Proceeds from sales of foreclosed assets	16,317	1,647
Purchases of premises and equipment, net	(10,423)	(4,547)
Proceeds from sales of premises and equipment	9	95
Proceeds from BOLI death benefit	555	1,188
Net (increase) decrease in equipment leased to others under operating leases	(3,196)	12,953
Net cash used in investing activities	(2,931,042)	(2,480,288)
Cash flows from financing activities:
Net (decrease) increase in noninterest-bearing deposits	(1,205,104)	2,021,120
Net increase in interest-bearing deposits	175,499	2,647,858
Net increase (decrease) in borrowings	(1,592,000)	(48,585)
Proceeds from subordinated notes offering	0	394,308
Proceeds from preferred stock offering	498,516	0
Common stock repurchased and restricted stock surrendered	(8,770)	(8,084)
Cash dividends paid	(59,998)	(59,503)
Net cash provided by financing activities	992,143	4,947,114
Net (decrease) increase in cash, cash equivalents, and restricted cash	(1,667,330)	2,697,431
Cash, cash equivalents, and restricted cash, beginning of period	4,057,234	3,160,661
Cash, cash equivalents, and restricted cash, end of period	2,389,904	5,858,092
Supplemental disclosures of cash flow information:
Cash paid for interest	38,596	24,683
Cash paid for income taxes	76,037	74,147
Loans transferred to foreclosed assets	304	647
Transfers from loans held for investment to loans held for sale	0	$ 25,554
Liabilities	36,972,320
Assets	40,950,723
Liabilities	$ 36,972,320