Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities:
Net earnings	$ 120,128	$ 150,406
Depreciation and amortization	13,577	12,924
Amortization of net premiums on securities available-for-sale	15,606	7,575
Amortization of intangible assets	3,649	3,079
Amortization of operating lease ROU assets	7,443	7,548
Provision for credit losses	0	(48,000)
Gain on sale of foreclosed assets	(3,177)	(73)
Provision for losses on foreclosed assets	0	14
Gain on sale of loans and leases	(60)	(139)
Gain on sale of premises and equipment	(2)	(28)
Gain on sale of securities	(104)	(101)
Unrealized gain on derivatives and foreign currencies, net	(1,176)	(546)
Earned stock compensation	7,557	6,417
Decrease in other assets	29,162	60,160
Decrease in accrued interest payable and other liabilities	(58,397)	(52,533)
Net cash provided by operating activities	134,206	146,703
Cash flows from investing activities:
Payments to Acquire Businesses, Gross	0	(121,909)
Net (increase) decrease in loans and leases	(1,448,692)	68,916
Proceeds from sales of loans and leases	36,758	72,780
Proceeds from maturities and paydowns of securities available-for-sale	243,921	200,367
Proceeds from sales of securities available-for-sale	206,192	44,652
Purchases of securities available-for-sale	(356,196)	(1,050,217)
Proceeds from sales of foreclosed assets	16,020	435
Purchases of premises and equipment, net	(7,287)	(1,936)
Proceeds from sales of premises and equipment	3	64
Net decrease (increase) in equipment leased to others under operating leases	4,661	(4,289)
Net cash used in investing activities	(1,304,620)	(791,137)
Cash flows from financing activities:
Net (decrease) increase in noninterest-bearing deposits	(486,082)	1,786,655
Net (decrease) increase in interest-bearing deposits	(1,286,780)	1,458,939
Net increase (decrease) in borrowings	991,000	(35,460)
Common stock repurchased and restricted stock surrendered	(4,481)	(1,908)
Cash dividends paid	(29,796)	(29,587)
Net cash (used in) provided by financing activities	(816,139)	3,178,639
Net (decrease) increase in cash, cash equivalents, and restricted cash	(1,986,553)	2,534,205
Cash, cash equivalents, and restricted cash, beginning of period	4,057,234	3,160,661
Cash, cash equivalents, and restricted cash, end of period	2,070,681	5,694,866
Supplemental disclosures of cash flow information:
Cash paid for interest	10,635	12,421
Cash paid for income taxes	2,138	2,706
Loans transferred to foreclosed assets	304	647
Transfers from loans held for investment to loans held for sale	0	$ 25,554
Liabilities	35,599,044
Liabilities	35,599,044
Assets	$ 39,249,639