Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Cash and cash equivalents:
Cash and due from banks	$ 507,425	$ 510,922
Federal funds sold and interest-earning deposits with banks	338,829	236,435
Deposits in other financial institutions (restricted cash)	270,912	251,520
Total cash and cash equivalents	1,117,166	998,877
Trading securities, at fair value	92,161	31,321
Investment securities:
Securities held to maturity (fair value of $1,920,941 and $2,084,736)	2,348,528	2,487,440
Securities available for sale, at fair value	4,498,264	4,784,388
Other investments	201,516	192,043
Total investment securities	7,048,308	7,463,871
Loans held for sale	100,007	50,888
Loans:
Total loans	33,234,564	32,388,489
Less allowance for credit losses	(472,298)	(456,573)
Loans, net	32,762,266	31,931,916
Premises and equipment, net	517,382	519,197
Bank owned life insurance ("BOLI")	1,001,998	991,454
Deferred tax assets	162,951	164,354
Derivatives assets	185,036	172,939
Mortgage servicing rights	88,904	85,164
Core deposit and other intangibles	77,389	88,776
Goodwill	1,923,106	1,923,106
Other assets	417,296	480,161
Total assets	45,493,970	44,902,024
Deposits:
Noninterest-bearing	10,374,464	10,649,274
Interest-bearing	26,723,938	26,399,635
Total deposits	37,098,402	37,048,909
Federal funds purchased	287,973	248,162
Securities sold under agreements to repurchase	254,430	241,023
Corporate and subordinated debentures	391,719	391,904
Other borrowings	300,000	100,000
Reserve for unfunded commitments	50,248	56,303
Derivative liabilities	955,347	804,486
Other liabilities	505,448	478,139
Total liabilities	39,843,567	39,368,926
Shareholders' equity:
Common stock - $2.50 par value; authorized 160,000,000 shares; 76,195,723 and 76,022,039 shares issued and outstanding, respectively	190,489	190,055
Surplus	4,238,192	4,240,413
Retained earnings	1,841,933	1,685,166
Accumulated other comprehensive loss	(620,211)	(582,536)
Total shareholders' equity	5,650,403	5,533,098
Total liabilities and shareholders' equity	45,493,970	44,902,024
Acquired - non-purchased credit deteriorated loans
Loans:
Total loans	4,253,323	4,796,913
Acquired - purchased credit deteriorated loans
Loans:
Total loans	957,255	1,108,813
Non-acquired loans
Loans:
Total loans	$ 28,023,986	$ 26,482,763