XML 73 R62.htm IDEA: XBRL DOCUMENT
v3.25.3

LOANS AND LEASES - Schedule of Loan Modifications, Subsequently Defaulted (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Financing Receivable, Modified [Line Items] |  |  |  |
Total loans that subsequently defaulted | $ 0.1 | $ 0.9 | $ 13.8 | $ 34.8
Term Extension |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Total loans that subsequently defaulted | 0.1 | 0.7 | 4.6 | 23.3
Term Extension and Rate Reduction |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Total loans that subsequently defaulted | 0.0 | 0.1 | 3.5 | 0.3
Balloon Payment |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Total loans that subsequently defaulted |  | 0.1 |  | 0.7
Other |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Total loans that subsequently defaulted | 0.0 | 0.0 | 5.7 | 10.5
Total commercial loans and leases |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Total loans that subsequently defaulted | 0.1 | 0.1 | 10.3 | 32.3
Total commercial loans and leases | Term Extension |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Total loans that subsequently defaulted | 0.1 | 0.0 | 1.6 | 20.9
Total commercial loans and leases | Term Extension and Rate Reduction |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Total loans that subsequently defaulted | 0.0 | 0.0 | 3.0 | 0.2
Total commercial loans and leases | Balloon Payment |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Total loans that subsequently defaulted |  | 0.1 |  | 0.7
Total commercial loans and leases | Other |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Total loans that subsequently defaulted | 0.0 | 0.0 | 5.7 | 10.5
Total commercial loans and leases | Commercial real estate |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Total loans that subsequently defaulted | 0.1 | 0.1 | 3.0 | 10.3
Total commercial loans and leases | Commercial real estate | Term Extension |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Total loans that subsequently defaulted | 0.1 | 0.0 | 1.1 | 0.7
Total commercial loans and leases | Commercial real estate | Term Extension and Rate Reduction |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Total loans that subsequently defaulted | 0.0 | 0.0 | 0.0 | 0.0
Total commercial loans and leases | Commercial real estate | Balloon Payment |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Total loans that subsequently defaulted |  | 0.1 |  | 0.7
Total commercial loans and leases | Commercial real estate | Other |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Total loans that subsequently defaulted | $ 0.0 | 0.0 | 1.9 | 8.9
Total commercial loans and leases | Commercial and industrial |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Total loans that subsequently defaulted |  |  | 7.3 | 22.0
Total commercial loans and leases | Commercial and industrial | Term Extension |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Total loans that subsequently defaulted |  |  | 0.5 | 20.2
Total commercial loans and leases | Commercial and industrial | Term Extension and Rate Reduction |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Total loans that subsequently defaulted |  |  | 3.0 | 0.2
Total commercial loans and leases | Commercial and industrial | Balloon Payment |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Total loans that subsequently defaulted |  |  |  | 0.0
Total commercial loans and leases | Commercial and industrial | Other |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Total loans that subsequently defaulted |  |  | 3.8 | 1.6
Total consumer loans |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Total loans that subsequently defaulted |  | 0.8 | 3.5 | 2.5
Total consumer loans | Term Extension |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Total loans that subsequently defaulted |  | 0.7 | 3.0 | 2.4
Total consumer loans | Term Extension and Rate Reduction |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Total loans that subsequently defaulted |  | 0.1 | 0.5 | 0.1
Total consumer loans | Balloon Payment |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Total loans that subsequently defaulted |  | 0.0 |  | 0.0
Total consumer loans | Other |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Total loans that subsequently defaulted |  | 0.0 | 0.0 | 0.0
Total consumer loans | Direct installment |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Total loans that subsequently defaulted |  | 0.4 | 0.4 | 0.5
Total consumer loans | Direct installment | Term Extension |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Total loans that subsequently defaulted |  | 0.4 | 0.4 | 0.5
Total consumer loans | Direct installment | Term Extension and Rate Reduction |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Total loans that subsequently defaulted |  | 0.0 | 0.0 | 0.0
Total consumer loans | Direct installment | Balloon Payment |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Total loans that subsequently defaulted |  | 0.0 |  | 0.0
Total consumer loans | Direct installment | Other |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Total loans that subsequently defaulted |  | 0.0 | 0.0 | 0.0
Total consumer loans | Residential mortgages |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Total loans that subsequently defaulted |  | 0.4 | 2.9 | 2.0
Total consumer loans | Residential mortgages | Term Extension |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Total loans that subsequently defaulted |  | 0.3 | 2.4 | 1.9
Total consumer loans | Residential mortgages | Term Extension and Rate Reduction |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Total loans that subsequently defaulted |  | 0.1 | 0.5 | 0.1
Total consumer loans | Residential mortgages | Balloon Payment |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Total loans that subsequently defaulted |  | 0.0 |  | 0.0
Total consumer loans | Residential mortgages | Other |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Total loans that subsequently defaulted |  | $ 0.0 | 0.0 | $ 0.0
Total consumer loans | Consumer lines of credit |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Total loans that subsequently defaulted |  |  | 0.2 |
Total consumer loans | Consumer lines of credit | Term Extension |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Total loans that subsequently defaulted |  |  | 0.2 |
Total consumer loans | Consumer lines of credit | Term Extension and Rate Reduction |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Total loans that subsequently defaulted |  |  | 0.0 |
Total consumer loans | Consumer lines of credit | Other |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Total loans that subsequently defaulted |  |  | $ 0.0 |

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 12A -Publisher FASB -URI https://asc.fasb.org/1943274/2147481933/310-10-55-12A Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 34 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-34 Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 33 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-33 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-42 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-42 + Details
Name: | us-gaap_FinancingReceivableModificationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amortized cost of financing receivable with payment default in current period and modified within previous 12 months preceding payment default for debtor experiencing financial difficulty. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 12A -Publisher FASB -URI https://asc.fasb.org/1943274/2147481933/310-10-55-12A Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 34 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-34 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 44 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-44 + Details
Name: | us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=us-gaap_ExtendedMaturityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=us-gaap_ExtendedMaturityAndInterestRateReductionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=fnb_BalloonPaymentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=fnb_OtherLoanRestructuringModificationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fnb_CommercialAndIndustrialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fnb_DirectInstallmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fnb_ResidentialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fnb_ConsumerLinesOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |