Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Assets
Cash and due from banks	$ 238,148	$ 257,153
Interest-bearing deposits with other banks	1,493,312	1,340,620
Federal funds sold	1,186	1,170
Total cash and cash equivalents	1,732,646	1,598,943
Securities available for sale at estimated fair value (amortized cost-$3,980,612 at March 31, 2024 and $4,149,895 at December 31, 2023, allowance for credit losses of $0 at March 31, 2024 and December 31, 2023)	3,613,975	3,786,377
Securities held to maturity, net of allowance for credit losses of $19 at March 31, 2024 and $17 at December 31, 2023 (estimated fair value-$1,020 at March 31, 2024 and December 31, 2023)	1,001	1,003
Equity securities at estimated fair value	8,762	8,945
Other investment securities	330,781	329,429
Loans held for sale measured using fair value option	44,426	56,261
Loans and leases	21,532,568	21,373,185
Less: Unearned income	(12,492)	(14,101)
Loans and leases, net of unearned income	21,520,076	21,359,084
Less: Allowance for loan and lease losses	(262,905)	(259,237)
Net loans and leases	21,257,171	21,099,847
Bank premises and equipment	190,988	190,520
Operating lease right-of-use assets	86,074	86,986
Goodwill	1,888,889	1,888,889
Mortgage servicing rights	4,241	4,554
Bank-owned life insurance ("BOLI")	490,596	486,895
Accrued interest receivable	113,815	111,420
Other assets	265,433	276,413
TOTAL ASSETS	30,028,798	29,926,482
Deposits:
Noninterest-bearing	6,017,349	6,149,080
Interest-bearing	16,902,397	16,670,239
Total deposits	22,919,746	22,819,319
Borrowings:
Securities sold under agreements to repurchase	207,727	196,095
Federal Home Loan Bank ("FHLB") borrowings	1,460,415	1,510,487
Other long-term borrowings	279,019	278,616
Reserve for lending-related commitments	42,915	44,706
Operating lease liabilities	92,266	92,885
Accrued expenses and other liabilities	219,269	213,134
TOTAL LIABILITIES	25,221,357	25,155,242
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-142,536,369 and 142,257,646 at March 31, 2024 and December 31, 2023, respectively, including 7,343,694 and 7,308,583 shares in treasury at March 31, 2024 and December 31, 2023, respectively	356,341	355,644
Surplus	3,183,198	3,181,764
Retained earnings	1,782,220	1,745,619
Accumulated other comprehensive loss	(260,992)	(259,681)
Treasury stock, at cost	(253,326)	(252,106)
TOTAL SHAREHOLDERS' EQUITY	4,807,441	4,771,240
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 30,028,798	$ 29,926,482