Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Assets
Cash and due from banks	$ 322,321	$ 282,878
Interest-bearing deposits with other banks	1,032,959	3,474,365
Federal funds sold	1,067	927
Total cash and cash equivalents	1,356,347	3,758,170
Securities available for sale at estimated fair value (amortized cost-$5,142,448 at September 30, 2022 and $4,031,494 at December 31, 2021, allowance for credit losses of $0 at September 30, 2022 and December 31, 2021)	4,648,087	4,042,699
Securities held to maturity, net of allowance for credit losses of $19 at September 30, 2022 and December 31, 2021 (estimated fair value-$1,020 at September 30, 2022 and December 31, 2021)	1,001	1,001
Equity securities at estimated fair value	7,314	12,404
Other investment securities	267,292	239,645
Loans held for sale measured using fair value option	210,075	504,416
Loans and leases	19,722,485	18,051,307
Less: Unearned income	(22,405)	(27,659)
Loans and leases, net of unearned income	19,700,080	18,023,648
Less: Allowance for loan and lease losses	(219,611)	(216,016)
Net loans and leases	19,480,469	17,807,632
Bank premises and equipment	198,745	197,220
Operating lease right-of-use assets	74,043	81,942
Goodwill	1,888,889	1,886,494
Mortgage servicing rights, net of valuation allowance of $0 at September 30, 2022 and $883 at December 31, 2021	21,908	23,144
Bank-owned life insurance ("BOLI")	478,518	478,067
Accrued interest receivable, net of allowance for credit losses of $0 at September 30, 2022 and $8 at December 31, 2021	82,347	64,512
Other assets	333,440	231,556
TOTAL ASSETS	29,048,475	29,328,902
Deposits:
Noninterest-bearing	7,618,823	7,496,560
Interest-bearing	15,244,554	15,853,703
Total deposits	22,863,377	23,350,263
Borrowings:
Securities sold under agreements to repurchase	142,476	128,844
Federal Home Loan Bank ("FHLB") borrowings	1,010,846	532,199
Other long-term borrowings	286,462	285,195
Reserve for lending-related commitments	39,698	31,442
Operating lease liabilities	78,748	86,703
Accrued expenses and other liabilities	186,782	195,628
TOTAL LIABILITIES	24,608,389	24,610,274
Shareholders' Equity
Preferred stock, $1.00 par value; Authorized-50,000,000 shares, none issued	0	0
Common stock, $2.50 par value; Authorized-200,000,000 shares; issued-141,897,873 and 141,360,266 at September 30, 2022 and December 31, 2021, respectively, including 7,266,226 and 4,967,508 shares in treasury at September 30, 2022 and December 31, 2021, respectively	354,745	353,402
Surplus	3,163,776	3,149,955
Retained earnings	1,524,265	1,390,777
Accumulated other comprehensive loss	(352,304)	(4,888)
Treasury stock, at cost	(250,396)	(170,618)
TOTAL SHAREHOLDERS' EQUITY	4,440,086	4,718,628
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 29,048,475	$ 29,328,902