Borrowings - Schedule of Borrowings (Details) - USD ($) $ in Thousands		Mar. 31, 2025	Dec. 31, 2024
Short-term borrowings
Repurchase agreements		$ 73,000	$ 60,000
Advances from FHLB		1,500,000	1,000,000
Total short-term borrowings		1,573,000	1,060,000
Long-term borrowings
Senior notes		2,996,000	3,745,000
Advances from FHLB		4,000	2,004,000
Subordinated notes		481,000	474,000
Other		10,000	10,000
Total long-term borrowings	[1]	10,496,000	12,605,000
M&T
Long-term borrowings
Senior notes		4,796,000	4,710,000
Junior subordinated debentures — M&T (a)		402,000	433,000
Asset-backed notes (a)		$ 1,807,000	$ 1,229,000

[1] Loans and leases of $2.1 billion and $1.5 billion at March 31, 2025 and December 31, 2024, respectively, were held in special purpose trusts to settle the respective obligations of asset-backed notes issued by those trusts. The outstanding balances of those asset-backed notes were included in Long-term borrowings and were $1.8 billion at March 31, 2025 and $1.2 billion at December 31, 2024.