Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Operating Activities:
Net income	$ 218,216	$ 234,083
Adjustments to reconcile net income to net cash from operating activities:
Credit loss expense	0	63
Deferred tax expense (benefit)	(2,404)	5,188
Accretion of loan discounts	(6,581)	(6,577)
Securities premium amortization (discount accretion), net	53,225	60,434
Net (gain) loss on securities transactions	0	0
Depreciation and amortization	35,406	34,060
Net (gain) loss on sale/write-down of assets/foreclosed assets	103	(1,876)
Stock-based compensation	5,530	5,771
Net tax benefit from stock-based compensation	1,645	4,218
Earnings on life insurance policies	(1,016)	(1,343)
Net change in:
Trading account securities	482	319
Lease right-of-use assets	12,042	11,697
Accrued interest receivable and other assets	(135,239)	(39,195)
Accrued interest payable and other liabilities	113,645	41,748
Net cash from operating activities	295,054	348,590
Investing Activities:
Securities held-to-maturity - Purchases	(411,527)	0
Securities held to maturity: Maturities, calls and principal repayments	263,226	122,416
Securities available for sale:
Purchases	(4,778,475)	(801,167)
Sales	0	0
Maturities, calls and principal repayments	382,152	576,763
Proceeds from sale of loans	2,365	0
Net change in loans	(404,515)	884,799
Benefits received on life insurance policies	1,332	1,509
Proceeds from sales of premises and equipment	18	6,436
Purchases of premises and equipment	(28,016)	(28,053)
Proceeds from sales of repossessed properties	1,543	100
Net cash from investing activities	(4,971,897)	762,803
Financing Activities:
Net change in deposits	2,906,069	3,718,379
Net change in short-term borrowings	(1,058,839)	126,592
Proceeds from stock option exercises	6,490	36,682
Purchase of treasury stock	(996)	(1,288)
Cash dividends paid on preferred stock	(3,338)	(3,820)
Cash dividends paid on common stock	(96,958)	(92,396)
Net cash from financing activities	1,752,428	3,784,149
Net change in cash and cash equivalents	(2,924,415)	4,895,542
Cash and cash equivalents at beginning of period	16,583,000	10,288,853
Cash and cash equivalents at end of period	$ 13,658,585	$ 15,184,395