Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Cash and cash equivalents:
Cash and due from banks	$ 563,887	$ 510,922
Federal funds sold and interest-earning deposits with banks	384,853	236,435
Deposits in other financial institutions (restricted cash)	263,939	251,520
Total cash and cash equivalents	1,212,679	998,877
Trading securities, at fair value	87,103	31,321
Investment securities:
Securities held to maturity (fair value of $1,963,746 and $2,084,736)	2,301,307	2,487,440
Securities available for sale, at fair value	4,564,363	4,784,388
Other investments	211,458	192,043
Total investment securities	7,077,128	7,463,871
Loans held for sale	287,043	50,888
Loans:
Total loans	33,548,192	32,388,489
Less allowance for credit losses	(467,981)	(456,573)
Loans, net	33,080,211	31,931,916
Premises and equipment, net	507,452	519,197
Bank owned life insurance ("BOLI")	1,007,275	991,454
Deferred tax assets	122,384	164,354
Derivatives assets	195,722	172,939
Mortgage servicing rights	83,512	85,164
Core deposit and other intangibles	71,835	88,776
Goodwill	1,923,106	1,923,106
Other assets	427,197	480,161
Total assets	46,082,647	44,902,024
Deposits:
Noninterest-bearing	10,376,531	10,649,274
Interest-bearing	27,261,664	26,399,635
Total deposits	37,638,195	37,048,909
Federal funds purchased	290,429	248,162
Securities sold under agreements to repurchase	247,893	241,023
Corporate and subordinated debentures	391,626	391,904
Other borrowings	300,000	100,000
Reserve for unfunded commitments	41,515	56,303
Derivative liabilities	606,194	804,486
Other liabilities	662,215	478,139
Total liabilities	40,178,067	39,368,926
Shareholders' equity:
Common stock - $2.50 par value; authorized 160,000,000 shares; 76,269,577 and 76,022,039 shares issued and outstanding, respectively	190,674	190,055
Surplus	4,249,672	4,240,413
Retained earnings	1,943,874	1,685,166
Accumulated other comprehensive loss	(479,640)	(582,536)
Total shareholders' equity	5,904,580	5,533,098
Total liabilities and shareholders' equity	46,082,647	44,902,024
Acquired - non-purchased credit deteriorated loans
Loans:
Total loans	3,959,028	4,796,913
Acquired - purchased credit deteriorated loans
Loans:
Total loans	913,342	1,108,813
Non-acquired loans
Loans:
Total loans	$ 28,675,822	$ 26,482,763