Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Cash flows from operating activities:
Net income	$ 390,605	$ 387,517
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	41,547	44,365
Provision for credit losses	9,604	104,189
Deferred income taxes	17,335	72,680
Gains on sale of securities, net		(45)
Share-based compensation expense	20,898	28,484
Accretion of discount related to acquired loans	(11,531)	(16,931)
(Gains) losses on disposal of premises and equipment	(19)	27
Gains on sale of bank properties held for sale and repossessed real estate	(938)	(1,454)
Net amortization of premiums and discounts on investment securities	14,559	15,181
Bank properties held for sale and repossessed real estate write downs	246	1,525
Fair value adjustment for loans held for sale	(232)	508
Originations and purchases of mortgage loans held for sale	(848,574)	(666,880)
Proceeds from sales of mortgage loans held for sale	846,859	670,223
Gains on sales of mortgage loans held for sale	(12,030)	(2,327)
Originations and purchases of SBA loans held for sale	(420,403)	(73,512)
Proceeds from sales of SBA loans held for sale	106,222	80,104
Gains on sales of SBA loans held for sale	(8,781)	(6,592)
Increase in cash surrender value of BOLI	(20,572)	(18,573)
Net change in:
Accrued interest receivable	(11,133)	(16,665)
Prepaid assets	(1,473)	(4,178)
Operating leases	144	231
Bank owned life insurance	(1,989)	(1,589)
Trading securities	35,111	(82,891)
Derivative assets	(22,783)	(1,329)
Miscellaneous other assets	16,409	(41,921)
Accrued interest payable	(4,183)	38,945
Accrued income taxes	32,916	(31,740)
Derivative liabilities	(198,292)	217,735
Miscellaneous other liabilities	188,146	125,989
Net cash provided by operating activities	157,668	821,076
Cash flows from investing activities:
Proceeds from sales of investment securities available for sale		125,298
Proceeds from maturities and calls of investment securities held to maturity	182,902	145,751
Proceeds from maturities and calls of investment securities available for sale	406,148	404,718
Proceeds from sales and redemptions of other investment securities	130,642	185,875
Purchases of investment securities available for sale	(60,668)	(34,505)
Purchases of other investment securities	(140,168)	(193,310)
Net increase in loans	(1,177,079)	(1,855,352)
Recoveries of loans previously charged off	12,149	12,630
Purchase of bank owned life insurance		(5,966)
Purchases of premises and equipment	(22,391)	(26,372)
Proceeds from redemption and payout of bank owned life insurance policies	6,739	5,956
Proceeds from sale of bank properties held for sale and repossessed real estate	11,277	8,392
Proceeds from sale of premises and equipment	373	850
Net cash used in investing activities	(650,076)	(1,226,035)
Cash flows from financing activities:
Net increase in deposits	589,744	585,786
Net increase (decrease) in federal funds purchased and securities sold under agreements to repurchase and other short-term borrowings	49,137	(43,113)
Proceeds from borrowings	4,000,000	5,350,200
Repayment of borrowings	(3,800,000)	(5,350,200)
Common stock issuance	1,670	1,356
Common stock repurchases	(16,683)	(7,409)
Dividends paid	(121,651)	(116,479)
Stock options exercised	3,993	1,392
Net cash provided by financing activities	706,210	421,533
Net increase in cash and cash equivalents	213,802	16,574
Cash and cash equivalents at beginning of period	998,877	1,312,563
Cash and cash equivalents at end of period	1,212,679	1,329,137
Cash paid for:
Interest	551,066	291,649
Income taxes	61,511	68,672
Recognition of operating lease assets in exchange for lease liabilities	9,093	701
Schedule of Noncash Investing Transactions:
Real estate acquired in full or in partial settlement of loans	$ 3,774	$ 3,298