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REGULATORY MATTERS (Tables) | 12 Months Ended
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Dec. 31, 2025
Banking and Thrift, Other Disclosure [Abstract] |
Schedule of Capital Ratios | Following are the capital ratios for FNB and FNBPA: TABLE 22.1
| Actual |  | Well-Capitalized Requirements (1) |  | Minimum Capital Requirements plus Capital Conservation Buffer
(dollars in millions) | Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio
As of December 31, 2025 |  |  |  |  |  |  |  |  |  |  |
F.N.B. Corporation: |  |  |  |  |  |  |  |  |  |  |
Total capital | $ | 4,971 |  |  | 13.08 | % |  | $ | 3,799 |  |  | 10.00 | % |  | $ | 3,989 |  |  | 10.50 | %
Tier 1 capital | 4,317 |  |  | 11.36 |  |  | 2,279 |  |  | 6.00 |  |  | 3,229 |  |  | 8.50 |
CET1 | 4,317 |  |  | 11.36 |  |  | n/a |  | n/a |  | 2,659 |  |  | 7.00 |
Leverage | 4,317 |  |  | 9.11 |  |  | n/a |  | n/a |  | 1,896 |  |  | 4.00 |
Risk-weighted assets | 37,991 |  |  |  |  |  |  |  |  |  |  |
FNBPA: |  |  |  |  |  |  |  |  |  |  |
Total capital | $ | 5,188 |  |  | 13.75 | % |  | $ | 3,774 |  |  | 10.00 | % |  | $ | 3,963 |  |  | 10.50 | %
Tier 1 capital | 4,371 |  |  | 11.58 |  |  | 3,019 |  |  | 8.00 |  |  | 3,208 |  |  | 8.50 |
CET1 | 4,291 |  |  | 11.37 |  |  | 2,453 |  |  | 6.50 |  |  | 2,642 |  |  | 7.00 |
Leverage | 4,371 |  |  | 9.27 |  |  | 2,357 |  |  | 5.00 |  |  | 1,885 |  |  | 4.00 |
Risk-weighted assets | 37,743 |  |  |  |  |  |  |  |  |  |  |
As of December 31, 2024 |  |  |  |  |  |  |  |  |  |  |
F.N.B. Corporation: |  |  |  |  |  |  |  |  |  |  |
Total capital | $ | 4,635 |  |  | 12.35 | % |  | $ | 3,755 |  |  | 10.00 | % |  | $ | 3,942 |  |  | 10.50 | %
Tier 1 capital | 3,971 |  |  | 10.58 |  |  | 2,253 |  |  | 6.00 |  |  | 3,191 |  |  | 8.50 |
CET1 | 3,971 |  |  | 10.58 |  |  | n/a |  | n/a |  | 2,628 |  |  | 7.00 |
Leverage | 3,971 |  |  | 8.75 |  |  | n/a |  | n/a |  | 1,816 |  |  | 4.00 |
Risk-weighted assets | 37,546 |  |  |  |  |  |  |  |  |  |  |
FNBPA: |  |  |  |  |  |  |  |  |  |  |
Total capital | $ | 4,794 |  |  | 12.86 | % |  | $ | 3,728 |  |  | 10.00 | % |  | $ | 3,914 |  |  | 10.50 | %
Tier 1 capital | 3,962 |  |  | 10.63 |  |  | 2,982 |  |  | 8.00 |  |  | 3,169 |  |  | 8.50 |
CET1 | 3,882 |  |  | 10.41 |  |  | 2,423 |  |  | 6.50 |  |  | 2,610 |  |  | 7.00 |
Leverage | 3,962 |  |  | 8.78 |  |  | 2,257 |  |  | 5.00 |  |  | 1,806 |  |  | 4.00 |
Risk-weighted assets | 37,280 |  |  |  |  |  |  |  |  |  |  |
(1) Reflects the well-capitalized standard under Regulation Y for F.N.B. Corporation and the prompt corrective action framework for FNBPA.

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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1B + Details
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