Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Cash and cash equivalents:
Cash and due from banks	$ 394,794	$ 476,653
Federal funds sold and interest-earning deposits with banks	2,342,389	6,018,915
Deposits in other financial institutions (restricted cash)	72,512	347,579
Total cash and cash equivalents	2,809,695	6,843,147
Trading securities, at fair value	51,940	77,689
Investment securities:
Securities held to maturity (fair value of $2,299,162 and $1,778,064)	2,738,178	1,819,901
Securities available for sale, at fair value	5,369,610	5,193,478
Other investments	179,755	160,568
Total investment securities	8,287,543	7,173,947
Loans held for sale	34,477	191,723
Loans:
Total loans	28,836,303	23,928,166
Less allowance for credit losses	(324,398)	(301,807)
Loans, net	28,511,905	23,626,359
Other real estate owned	2,160	2,736
Bank property held for sale	25,043	9,578
Premises and equipment, net	531,160	558,499
Bank owned life insurance ("BOLI")	960,052	783,049
Deferred tax assets	198,647	64,964
Derivatives assets	1,083,803	414,742
Mortgage servicing rights	90,459	65,620
Core deposit and other intangibles	125,390	128,067
Goodwill	1,922,525	1,581,085
Other assets	543,810	438,827
Total assets	45,178,609	41,960,032
Deposits:
Noninterest-bearing	13,660,244	11,498,840
Interest-bearing	24,005,777	23,555,989
Total deposits	37,666,021	35,054,829
Federal funds purchased	213,773	381,195
Securities sold under agreements to repurchase	344,029	400,044
Corporate and subordinated debentures	392,368	327,066
Reserve for unfunded commitments	52,991	30,510
Derivative liabilities	1,082,948	410,137
Other liabilities	505,293	553,311
Total liabilities	40,257,423	37,157,092
Shareholders' equity:
Common stock - $2.50 par value; authorized 160,000,000 shares; 75,676,445 and 69,332,297 shares issued and outstanding, respectively	189,191	173,331
Surplus	4,207,040	3,653,098
Retained earnings	1,241,413	997,657
Accumulated other comprehensive loss	(716,458)	(21,146)
Total shareholders' equity	4,921,186	4,802,940
Total liabilities and shareholders' equity	45,178,609	41,960,032
Acquired - non-purchased credit deteriorated loans
Loans:
Total loans	6,365,175	5,890,069
Acquired - purchased credit deteriorated loans
Loans:
Total loans	1,544,562	1,987,322
Non-acquired loans
Loans:
Total loans	$ 20,926,566	$ 16,050,775