Variable interest entities and asset securitizations	12 Months Ended
Dec. 31, 2023
Text Block [Abstract]
Variable interest entities and asset securitizations	20. Variable interest entities and asset securitizations The Company’s securitization activity includes securitizing loans originated for sale into government issued or guaranteed mortgage-backed securities. The Company has not recognized any losses as a result of having securitized assets. In August 2023, a subsidiary of M&T Bank issued asset-backed notes secured by equipment finance loans and leases. Approximately $666 million of such loans and leases were sold into a special purpose trust which in turn issued asset-backed notes to investors. The loans and leases continue to be serviced by the subsidiary. A total of $550 million of such notes, representing the senior-most notes in the securitization, were purchased by third parties. Those asset-backed notes had a weighted-average estimated life of approximately two years and a weighted-average interest rate of 5.84% at the time of securitization. Additionally, $88 million of asset-backed notes representing subordinate note classes and other residual interests were issued by the trust and retained by the Company. As a result of the retention of the subordinate interests and its continued role as servicer of the loans and leases, the Company is considered to be the primary beneficiary of the securitization trust and, accordingly, the trust has been included in the Company's consolidated financial statements. At December 31, 2023, the remaining balance of the loans and leases in trust was $599 million and the outstanding asset-backed notes issued to third party investors was $474 million. As described in note 9, the Junior Subordinated Debentures are held by various trusts and were issued in connection with the issuance by those trusts of Preferred Capital Securities and Common Securities. M&T owns the Common Securities of those trust entities. The Company is not considered to be the primary beneficiary of those entities and, accordingly, the trusts are not included in the Company’s consolidated financial statements. At each of December 31, 2023 and 2022, the Company included the Junior Subordinated Debentures as “long-term borrowings” in its Consolidated Balance Sheet and recognized $22 million, in other assets for its “investment” in the Common Securities of the trusts that will be concomitantly repaid to M&T by the respective trust from the proceeds of M&T’s repayment of the Junior Subordinated Debentures associated with Preferred Capital Securities described in note 9. The Company has invested as a limited partner in various partnerships that collectively had total assets of approximately $9.8 billion at December 31, 2023 and $9.2 billion at December 31, 2022. Those partnerships generally construct or acquire properties, including properties and facilities that produce renewable energy, for which the investing partners are eligible to receive certain federal income tax credits in accordance with government guidelines. Such investments also typically provide tax deductible losses to the partners. The partnership investments also assist the Company in achieving its community reinvestment initiatives. As a limited partner, there is no recourse to the Company by creditors of the partnerships. However, the tax credits that result from the Company’s investments in such partnerships are generally subject to recapture should a partnership fail to comply with the respective government regulations. The Company's carrying amount of its investments in such partnerships was $1.5 billion, including $441 million of unfunded commitments, at December 31, 2023 and $1.5 billion, including $545 million of unfunded commitments at December 31, 2022. Contingent commitments to provide additional capital contributions to these partnerships were $55 million at December 31, 2023. The Company has not provided financial or other support to the partnership that was not contractually required. The Company's maximum exposure to loss from its investments in such partnerships as of December 31, 2023 was $2.1 billion, including possible recapture of tax credits. Management currently estimates that no material losses are probable as a result of the Company’s involvement with such entities. The Company, in its position as limited partner, does not direct the activities that most significantly impact the economic performance of the partnerships and, therefore, in accordance with the accounting provisions for variable interest entities, the partnership entities are not included in the Company’s consolidated financial statements. The Company’s investment in qualified affordable housing projects is amortized to income taxes in the Consolidated Statement of Income as tax credits and other tax benefits resulting from deductible losses associated with the projects are received. The Company serves as investment advisor for certain registered money-market funds. The Company has no explicit arrangement to provide support to those funds, but may waive portions of its allowable management fees as a result of market conditions.

Variable interest entities and asset securitizations

12 Months Ended

Dec. 31, 2023

Variable interest entities and asset securitizations

20. Variable interest entities and asset securitizations

The Company’s securitization activity includes securitizing loans originated for sale into government issued or guaranteed mortgage-backed securities. The Company has not recognized any losses as a result of having securitized assets.

In August 2023, a subsidiary of M&T Bank issued asset-backed notes secured by equipment finance loans and leases. Approximately $666 million of such loans and leases were sold into a special purpose trust which in turn issued asset-backed notes to investors. The loans and leases continue to be serviced by the subsidiary. A total of $550 million of such notes, representing the senior-most notes in the securitization, were purchased by third parties. Those asset-backed notes had a weighted-average estimated life of approximately two years and a weighted-average interest rate of 5.84% at the time of securitization. Additionally, $88 million of asset-backed notes representing subordinate note classes and other residual interests were issued by the trust and retained by the Company. As a result of the retention of the subordinate interests and its continued role as servicer of the loans and leases, the Company is considered to be the primary beneficiary of the securitization trust and, accordingly, the trust has been included in the Company's consolidated financial statements. At December 31, 2023, the remaining balance of the loans and leases in trust was $599 million and the outstanding asset-backed notes issued to third party investors was $474 million.

As described in note 9, the Junior Subordinated Debentures are held by various trusts and were issued in connection with the issuance by those trusts of Preferred Capital Securities and Common Securities. M&T owns the Common Securities of those trust entities. The Company is not considered to be the primary beneficiary of those entities and, accordingly, the trusts are not included in the Company’s consolidated financial statements. At each of December 31, 2023 and 2022, the Company included the Junior Subordinated Debentures as “long-term borrowings” in its Consolidated Balance Sheet and recognized $22 million, in other assets for its “investment” in the Common Securities of the trusts that will be concomitantly repaid to M&T by the respective trust from the proceeds of M&T’s repayment of the Junior Subordinated Debentures associated with Preferred Capital Securities described in note 9.

The Company has invested as a limited partner in various partnerships that collectively had total assets of approximately $9.8 billion at December 31, 2023 and $9.2 billion at December 31, 2022. Those partnerships generally construct or acquire properties, including properties and facilities that produce renewable energy, for which the investing partners are eligible to receive certain federal income tax credits in accordance with government guidelines. Such investments also typically provide tax deductible losses to the partners. The partnership investments also assist the Company in achieving its community reinvestment initiatives. As a limited partner, there is no recourse to the Company by creditors of the partnerships. However, the tax credits that result from the Company’s investments in such partnerships are generally subject to recapture should a partnership fail to comply with the respective government regulations. The Company's carrying amount of its investments in such

partnerships was $1.5 billion, including $441 million of unfunded commitments, at December 31, 2023 and $1.5 billion, including $545 million of unfunded commitments at December 31, 2022. Contingent commitments to provide additional capital contributions to these partnerships were $55 million at December 31, 2023. The Company has not provided financial or other support to the partnership that was not contractually required. The Company's maximum exposure to loss from its investments in such partnerships as of December 31, 2023 was $2.1 billion, including possible recapture of tax credits. Management currently estimates that no material losses are probable as a result of the Company’s involvement with such entities. The Company, in its position as limited partner, does not direct the activities that most significantly impact the economic performance of the partnerships and, therefore, in accordance with the accounting provisions for variable interest entities, the partnership entities are not included in the Company’s consolidated financial statements. The Company’s investment in qualified affordable housing projects is amortized to income taxes in the Consolidated Statement of Income as tax credits and other tax benefits resulting from deductible losses associated with the projects are received.

The Company serves as investment advisor for certain registered money-market funds. The Company has no explicit arrangement to provide support to those funds, but may waive portions of its allowable management fees as a result of market conditions.