Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Operating Activities:
Net income	$ 387,976	$ 342,058
Adjustments to reconcile net income to net cash from operating activities:
Credit loss expense	0	63
Deferred tax expense (benefit)	(3,378)	4,672
Accretion of loan discounts	(10,572)	(9,879)
Securities premium amortization (discount accretion), net	76,328	90,017
Net (gain) loss on securities transactions	0	0
Depreciation and amortization	53,303	51,550
Net (gain) loss on sale/write-down of assets/foreclosed assets	109	(1,885)
Stock-based compensation	8,703	7,756
Net tax benefit from stock-based compensation	2,894	4,505
Earnings on life insurance policies	(1,561)	(1,901)
Net change in:
Trading account securities	154	(421)
Lease right-of-use assets	18,151	17,566
Accrued interest receivable and other assets	(63,382)	(65,849)
Accrued interest payable and other liabilities	71,187	114,361
Net cash from operating activities	539,912	552,613
Investing Activities:
Securities held-to-maturity - Purchases	(878,434)	0
Securities held to maturity: Maturities, calls and principal repayments	557,901	171,969
Securities available for sale:
Purchases	(6,702,519)	(4,105,085)
Sales	0	0
Maturities, calls and principal repayments	1,140,939	3,125,786
Proceeds from sale of loans	2,365	0
Net change in loans	(617,981)	1,649,429
Benefits received on life insurance policies	1,332	1,944
Proceeds from sales of premises and equipment	47	7,033
Purchases of premises and equipment	(55,635)	(37,088)
Proceeds from sales of repossessed properties	2,585	809
Net cash from investing activities	(6,549,400)	814,797
Financing Activities:
Net change in deposits	3,864,490	4,597,006
Net change in short-term borrowings	(657,785)	110,232
Proceeds from stock option exercises	11,760	37,810
Purchase of treasury stock	(996)	(1,342)
Cash dividends paid on preferred stock	(5,006)	(5,488)
Cash dividends paid on common stock	(153,277)	(140,510)
Net cash from financing activities	3,059,186	4,597,708
Net change in cash and cash equivalents	(2,950,302)	5,965,118
Cash and cash equivalents at beginning of period	16,583,000	10,288,853
Cash and cash equivalents at end of period	$ 13,632,698	$ 16,253,971