Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Assets
Cash and due from banks	$ 352,790	$ 282,878
Interest-bearing deposits with other banks	1,304,649	3,474,365
Federal funds sold	1,047	927
Total cash and cash equivalents	1,658,486	3,758,170
Securities available for sale at estimated fair value (amortized cost-$5,153,285 at June 30, 2022 and $4,031,494 at December 31, 2021, allowance for credit losses of $0 at June 30, 2022 and December 31, 2021)	4,812,704	4,042,699
Securities held to maturity, net of allowance for credit losses of $18 at June 30, 2022 and $19 at December 31, 2021 (estimated fair value-$1,020 at June 30, 2022 and December 31, 2021)	1,002	1,001
Equity securities at estimated fair value	13,513	12,404
Other investment securities	246,399	239,645
Loans held for sale measured using fair value option	220,689	504,416
Loans and leases	18,994,125	18,051,307
Less: Unearned income	(23,730)	(27,659)
Loans and leases, net of unearned income	18,970,395	18,023,648
Less: Allowance for loan and lease losses	(213,729)	(216,016)
Net loans and leases	18,756,666	17,807,632
Bank premises and equipment	197,633	197,220
Operating lease right-of-use assets	75,143	81,942
Goodwill	1,888,889	1,886,494
Mortgage servicing rights, net of valuation allowance of $0 at June 30, 2022 and $883 at December 31, 2021	22,593	23,144
Bank-owned life insurance ("BOLI")	473,470	478,067
Accrued interest receivable, net of allowance for credit losses of $0 at June 30, 2022 and $8 at December 31, 2021	71,035	64,512
Other assets	339,674	231,556
TOTAL ASSETS	28,777,896	29,328,902
Deposits:
Noninterest-bearing	9,030,939	8,980,547
Interest-bearing	13,995,710	14,369,716
Total deposits	23,026,649	23,350,263
Borrowings:
Securities sold under agreements to repurchase	128,242	128,844
Federal Home Loan Bank ("FHLB") borrowings	510,918	532,199
Other long-term borrowings	286,043	285,195
Reserve for lending-related commitments	42,579	31,442
Operating lease liabilities	79,787	86,703
Accrued expenses and other liabilities	216,628	195,628
TOTAL LIABILITIES	24,290,846	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-141,845,451 and 141,360,266 at June 30, 2022 and December 31, 2021, respectively, including 7,265,805 and 4,967,508 shares in treasury at June 30, 2022 and December 31, 2021, respectively	354,616	353,402
Surplus	3,159,928	3,149,955
Retained earnings	1,470,244	1,390,777
Accumulated other comprehensive loss	(247,357)	(4,888)
Treasury stock, at cost	(250,381)	(170,618)
TOTAL SHAREHOLDERS' EQUITY	4,487,050	4,718,628
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 28,777,896	$ 29,328,902