Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Operating Activities:
Net income	$ 135,690	$ 177,653
Adjustments to reconcile net income to net cash from operating activities:
Credit loss expense	13,650	9,104
Deferred tax expense (benefit)	(4,446)	(1,809)
Accretion of loan discounts	(4,966)	(5,125)
Securities premium amortization (discount accretion), net	13,248	20,520
Net (gain) loss on securities transactions	0	(21)
Depreciation and amortization	20,236	18,472
Net (gain) loss on sale/write-down of assets/foreclosed assets	91	(284)
Stock-based compensation	3,738	4,742
Net tax benefit from stock-based compensation	373	342
Earnings on life insurance policies	(909)	(625)
Net change in:
Trading account securities	(3,558)	1,739
Lease right-of-use assets	6,220	4,952
Accrued interest receivable and other assets	331,765	132,345
Accrued interest payable and other liabilities	(22,698)	(193,659)
Net cash from operating activities	488,434	168,346
Investing Activities:
Securities held-to-maturity - Purchases	0	(839,794)
Securities held to maturity: Maturities, calls and principal repayments	17,692	67,311
Securities available for sale:
Purchases	(927,165)	(7,308,338)
Sales	0	884,273
Maturities, calls and principal repayments	2,134,363	6,926,125
Proceeds from sale of loans	300	0
Net change in loans	(566,638)	(334,708)
Benefits received on life insurance policies	129	212
Proceeds from sales of premises and equipment	4	1,176
Purchases of premises and equipment	(38,184)	(46,103)
Proceeds from sales of repossessed properties	0	558
Net cash from investing activities	620,501	(649,288)
Financing Activities:
Net change in deposits	(1,114,082)	(1,770,041)
Net change in short-term borrowings	(156,981)	(417,397)
Proceeds from stock option exercises	2,915	1,500
Purchase of treasury stock	(2,073)	(1,173)
Cash dividends paid on preferred stock	(1,669)	(1,669)
Cash dividends paid on common stock	(59,804)	(56,636)
Net cash from financing activities	(1,331,694)	(2,245,416)
Net change in cash and cash equivalents	(222,759)	(2,726,358)
Cash and cash equivalents at beginning of period	8,687,276	12,028,132
Cash and cash equivalents at end of period	$ 8,464,517	$ 9,301,774