Condensed Consolidated Statements of Cash Flows $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)
Cash flows from operating activities:
Net earnings	$ 374,104	$ 470,914
Depreciation and amortization	40,181	38,311
Amortization of net premiums on investment securities	42,090	28,480
Amortization of intangible assets	10,947	8,858
Amortization of operating lease ROU assets	22,821	22,866
Provision for credit losses	14,500	(156,000)
Gain on sale of foreclosed assets	(3,353)	(135)
Provision for losses on foreclosed assets	0	14
Gain on sale of loans and leases	(130)	(1,561)
Gain on sale of premises and equipment	(3)	(5)
Loss (gain) on sale of securities	1,019	(616)
Gain on BOLI death benefit	0	(491)
Unrealized gain on derivatives and foreign currencies, net	(1,961)	(804)
Earned stock compensation	26,906	23,907
Decrease (increase) in other assets	1,445	(1,516)
Decrease in accrued interest payable and other liabilities	(29,471)	(39,911)
Net cash provided by operating activities	499,095	392,311
Cash flows from investing activities:
Cash paid for acquisition, net	0	(123,090)
Net increase in loans and leases	(4,800,187)	(1,485,780)
Proceeds from sales of loans and leases	60,782	128,541
Proceeds from maturities and paydowns of securities available-for-sale	569,409	628,988
Proceeds from sales of securities available-for-sale	1,038,946	121,351
Purchases of securities available-for-sale	(375,251)	(4,921,557)
Proceeds from maturities and paydowns of securities held-to-maturity	571	0
Net purchases of Federal Home Loan Bank stock	(19,740)	0
Proceeds from sales of foreclosed assets	16,500	1,846
Purchases of premises and equipment, net	(13,075)	(15,078)
Proceeds from sales of premises and equipment	9	95
Proceeds from BOLI death benefit	555	4,143
Net increase in equipment leased to others under operating leases	(26,557)	(16,346)
Net cash used in investing activities	(3,548,038)	(5,676,887)
Cash flows from financing activities:
Net (decrease) increase in noninterest-bearing deposits	(1,767,377)	3,650,640
Net increase in interest-bearing deposits	965,492	1,931,049
Net increase (decrease) in borrowings	1,864,815	(55,210)
Net proceeds from subordinated notes offering	0	394,308
Net proceeds from preferred stock offering	498,516	0
Restricted stock surrendered	(9,430)	(8,200)
Preferred stock dividends paid	(9,392)	0
Common stock dividends paid	(90,207)	(89,474)
Net cash provided by financing activities	1,452,417	5,823,113
Net (decrease) increase in cash, cash equivalents, and restricted cash	(1,596,526)	538,537
Cash, cash equivalents, and restricted cash, beginning of period	4,057,234	3,160,661
Cash, cash equivalents, and restricted cash, end of period	2,460,708	3,699,198
Supplemental disclosures of cash flow information:
Cash paid for interest	101,613	35,505
Cash paid for income taxes	90,756	94,770
Loans transferred to foreclosed assets	3,271	1,062
Transfers from loans held for investment to loans held for sale	15,534	$ 25,554
Liabilities	37,528,647
Assets	41,404,592
Liabilities	$ 37,528,647