Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash flows from operating activities:
Net income	$ 263,373	$ 219,504
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	29,864	32,954
Provision for credit losses	71,480	10,837
Deferred income taxes	19,990	91,013
Gains on sale of securities, net	(45)
Share-based compensation expense	19,129	17,799
Accretion of discount related to acquired loans	(12,878)	(19,511)
(Gains) losses on disposal of premises and equipment	(89)	778
Gains on sale of bank properties held for sale and repossessed real estate	(1,430)	(871)
Net amortization of premiums on investment securities	10,197	14,884
Bank properties held for sale and repossessed real estate write downs	1,231	176
Fair value adjustment for loans held for sale	(66)	5,456
Originations and purchases of loans held for sale	(422,596)	(1,038,147)
Proceeds from sales of loans held for sale	411,489	1,146,583
(Gains) losses on sales of loans held for sale	(2,810)	3,951
Increase in cash surrender value of BOLI	(12,135)	(11,106)
Net change in:
Accrued interest receivable	(2,636)	(8,230)
Prepaid assets	(829)	2,019
Operating leases	196	195
Bank owned life insurance	(976)	(423)
Trading securities	(25,317)	(10,399)
Derivative assets	36,536	291,514
Miscellaneous other assets	4,258	(37,918)
Accrued interest payable	25,573	583
Accrued income taxes	(9,601)	(56,183)
Derivative liabilities	(58,426)	374,241
Miscellaneous other liabilities	28,174	(63,243)
Net cash provided by operating activities	371,656	966,456
Cash flows from investing activities:
Proceeds from sales of investment securities available for sale	125,298	415,503
Proceeds from maturities and calls of investment securities held to maturity	95,566	109,776
Proceeds from maturities and calls of investment securities available for sale	255,808	326,323
Proceeds from sales and redemptions of other investment securities	146,625	13,216
Purchases of investment securities available for sale	(3,174)	(1,157,493)
Purchases of investment securities held to maturity		(1,099,691)
Purchases of other investment securities	(163,636)	(20,446)
Net increase in loans	(1,361,435)	(1,616,946)
Net cash received from acquisitions		250,115
Recoveries of loans previously charged off	7,858	6,980
Purchase of bank owned life insurance	(5,966)	(85,966)
Purchases of premises and equipment	(15,034)	(9,102)
Proceeds from redemption and payout of bank owned life insurance policies	4,292	1,188
Proceeds from sale of bank properties held for sale and repossessed real estate	7,610	8,297
Proceeds from sale of premises and equipment	675	511
Net cash used in investing activities	(905,513)	(2,857,735)
Cash flows from financing activities:
Net increase in deposits	392,123	302,826
Net increase (decrease) in federal funds purchased and securities sold under agreements to repurchase and other short-term borrowings	25,029	(111,240)
Proceeds from FHLB borrowings	4,850,000
Repayment of FHLB borrowings	(4,450,000)	(13,000)
Common stock issuance	647	705
Common stock repurchases	(7,022)	(118,383)
Dividends paid	(76,907)	(70,931)
Stock options exercised	1,173	737
Net cash provided by (used in) financing activities	735,043	(9,286)
Net increase (decrease) in cash and cash equivalents	201,186	(1,900,565)
Cash and cash equivalents at beginning of period	1,312,563	6,721,571
Cash and cash equivalents at end of period	1,513,749	4,821,006
Cash paid for:
Interest	159,883	19,788
Income taxes	62,170	28,332
Recognition of operating lease assets in exchange for lease liabilities		12,616
Acquisitions:
Fair value of tangible assets acquired		3,501,273
Other intangible assets acquired		20,791
Liabilities assumed		3,205,694
Net identifiable assets acquired over liabilities assumed		341,440
Common stock issued in acquisition		659,772
Real estate acquired in full or in partial settlement of loans	$ 3,186	$ 1,151