Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Cash flows from operating activities:
Net income	$ 247,426	$ 263,373
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	27,837	29,864
Provision for credit losses	16,575	71,480
Deferred income taxes	9,221	19,990
Gains on sale of securities, net		(45)
Share-based compensation expense	13,027	19,129
Accretion of discount related to acquired loans	(8,673)	(12,878)
Gains on disposal of premises and equipment	(7)	(89)
Gains on sale of bank properties held for sale and repossessed real estate	(1,090)	(1,430)
Net amortization of premiums and discounts on investment securities	9,721	10,197
Bank properties held for sale and repossessed real estate write downs	52	1,231
Fair value adjustment for loans held for sale	(1,008)	(66)
Originations and purchases of loans held for sale	(553,362)	(422,596)
Proceeds from sales of loans held for sale	511,006	411,489
Gains on sales of loans held for sale	(5,755)	(2,810)
Increase in cash surrender value of BOLI	(13,444)	(12,135)
Net change in:
Accrued interest receivable	(5,462)	(2,636)
Prepaid assets	(4,177)	(829)
Operating leases	216	196
Bank owned life insurance	(840)	(976)
Trading securities	(60,840)	(25,317)
Derivative assets	(12,097)	36,536
Miscellaneous other assets	40,804	4,258
Accrued interest payable	(1,465)	25,573
Accrued income taxes	20,603	(9,601)
Derivative liabilities	150,861	(58,426)
Miscellaneous other liabilities	25,351	28,174
Net cash provided by operating activities	404,480	371,656
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	136,746	95,566
Proceeds from maturities and calls of investment securities available for sale	241,844	255,808
Proceeds from sales and redemptions of other investment securities	85,517	146,625
Purchases of investment securities available for sale	(13,014)	(3,174)
Purchases of other investment securities	(94,989)	(163,636)
Net increase in loans	(857,537)	(1,361,435)
Recoveries of loans previously charged off	9,626	7,858
Purchase of bank owned life insurance		(5,966)
Purchases of premises and equipment	(14,999)	(15,034)
Proceeds from redemption and payout of bank owned life insurance policies	3,739	4,292
Proceeds from sale of bank properties held for sale and repossessed real estate	8,724	7,610
Proceeds from sale of premises and equipment	363	675
Net cash used in investing activities	(493,980)	(905,513)
Cash flows from financing activities:
Net increase in deposits	49,798	392,123
Net increase in federal funds purchased and securities sold under agreements to repurchase and other short-term borrowings	53,218	25,029
Proceeds from borrowings	2,550,000	4,850,000
Repayment of borrowings	(2,350,000)	(4,450,000)
Common stock issuance	823	647
Common stock repurchases	(16,078)	(7,022)
Dividends paid	(80,413)	(76,907)
Stock options exercised	441	1,173
Net cash provided by financing activities	207,789	735,043
Net increase in cash and cash equivalents	118,289	201,186
Cash and cash equivalents at beginning of period	998,877	1,312,563
Cash and cash equivalents at end of period	1,117,166	1,513,749
Cash paid for:
Interest	355,649	159,883
Income taxes	42,186	62,170
Recognition of operating lease assets in exchange for lease liabilities	9,093
Schedule of Noncash Investing Transactions:
Real estate acquired in full or in partial settlement of loans	$ 3,604	$ 3,186