Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Assets
AFS investment securities, at fair value	$ 3,724,148	$ 3,600,892
HTM investment securities, net, at amortized cost	3,832,967	3,860,160
Equity Securities, FV-NI and without Readily Determinable Fair Value	19,571	41,651
FHLB and Federal Reserve Bank stocks, at cost	173,968	229,171
Residential loans held for sale	52,414	33,011
Commercial loans held for sale	0	90,303
Loans	29,494,263	29,216,218
Allowance for loan losses	(356,006)	(351,094)
Tax credit and other investments	255,252	258,067
Premises and equipment, net	367,618	372,978
Goodwill	1,104,992	1,104,992
Other intangible assets, net	38,268	40,471
Mortgage servicing rights, net	85,226	84,390
Interest receivable	167,092	169,569
Other assets	640,638	658,604
Total assets	41,137,084	41,015,855
Liabilities and stockholders' equity
Noninterest-bearing demand deposits	6,254,135	6,119,956
Interest-bearing deposits	27,459,023	27,326,093
Total deposits	33,713,158	33,446,049
Short-Term Debt	765,671	326,780
FHLB advances	1,333,411	1,940,194
Allowance for unfunded commitments	31,776	34,776
Accrued expenses and other liabilities	588,341	552,814
Total liabilities	36,968,412	36,841,882
Stockholders’ equity
Preferred equity	194,112	194,112
Common stock	1,752	1,752
Surplus	1,708,652	1,714,822
Retained earnings	2,991,571	2,946,805
Accumulated other comprehensive (loss)	(209,881)	(171,096)
Treasury stock, at cost	(517,533)	(512,421)
Total common equity	3,974,561	3,979,861
Total stockholders’ equity	4,168,673	4,173,973
Total liabilities and stockholders’ equity	$ 41,137,084	$ 41,015,855
Preferred shares authorized (par value $1.00 per share)	750,000	750,000
Preferred shares issued and outstanding	200,000	200,000
Common shares authorized (par value $0.01 per share)	250,000,000	250,000,000
Common shares issued	175,216,409	175,216,409
Common shares outstanding	150,738,678	151,036,674
Preferred shares, par value	$ 1.00	$ 1.00
Common shares, par value	$ 0.01	$ 0.01
Fair Value, Inputs, Level 1
Assets
Cash and Due from Banks	$ 429,859	$ 484,384
Interest-bearing deposits in other financial institutions	420,114	425,089
Federal funds sold and securities purchased under agreements to resell	1,610	14,350
Fair Value, Inputs, Level 2
Assets
Bank and corporate owned life insurance	685,089	682,649
Liabilities and stockholders' equity
FHLB advances	1,333,411	1,940,194
Other long-term funding	536,055	541,269
Fair Value, Inputs, Level 3
Assets
Loans, net	$ 29,138,257	$ 28,865,124