| Submission | Aug. 30, 2024 |
| Submission [Line Items] | |
| Central Index Key | 0000037808 |
| Registrant Name | FNB CORP/PA/ |
| Form Type | S-3 |
| Submission Type | S-3ASR |
| Fee Exhibit Type | EX-FILING FEES |
| Offerings - Offering: 1 | Aug. 30, 2024 USD ($) shares |
| Offering: | |
| Fee Previously Paid | false |
| Other Rule | true |
| Security Type | Equity |
| Security Class Title | Common stock, $0.01 par value |
| Amount Registered | shares | 4,000,000 |
| Proposed Maximum Offering Price per Unit | 14.75 |
| Maximum Aggregate Offering Price | $ 59,000,000 |
| Fee Rate | 0.01476% |
| Amount of Registration Fee | $ 8,708.4 |
| Offering Note | (1) Pursuant to Rule 416 under the Securities Act of 1933, this registration statement covers, in addition to the shares of common stock shown above, an indeterminate number of shares of common stock which, by reason of certain events specified in the F.N.B Corporation Dividend Reinvestment and Direct Stock Purchase Plan, may become subject to such plan. Fee calculated pursuant to Rule 457(c), based on $14.75 per share, which was the average of the high and low prices of the registrant’s common stock as reported by the New York Stock Exchange on August 26, 2024. |
| Offsets | Aug. 30, 2024 USD ($) shares |
| Offset: 1 | |
| Offset Payment: | |
| Offset Claimed | true |
| Rule 457(p) Offset | true |
| Registrant or Filer Name | FNB Corp/PA/ |
| Form or Filing Type | S-3 |
| File Number | 333-253805 |
| Initial Filing Date | Mar. 03, 2021 |
| Fee Offset Claimed | $ 909.09 |
| Security Type Associated with Fee Offset Claimed | Equity |
| Security Title Associated with Fee Offset Claimed | Common Stock, par value $0.01 per share |
| Unsold Securities Associated with Fee Offset Claimed | shares | 3,435,311 |
| Unsold Aggregate Offering Amount Associated with Fee Offset Claimed | $ 40,794,313.85 |
| Offset Note | (2) Pursuant to Rule 457(p), $909.09 of previously paid filing fees have not been used with respect No. 333-253805 S-3ASR”), S-3ASR |
| Termination / Withdrawal Statement | The offering of any unsold securities under the Existing Form S-3ASR |
| Offset: 2 | |
| Offset Payment: | |
| Offset Claimed | false |
| Rule 457(p) Offset | true |
| Registrant or Filer Name | FNB Corp/PA/ |
| Form or Filing Type | S-3 |
| File Number | 333-253805 |
| Filing Date | Mar. 03, 2021 |
| Fee Paid with Fee Offset Source | $ 909.09 |
| Fees Summary | Aug. 30, 2024 USD ($) |
| Fees Summary [Line Items] | |
| Total Offering | $ 59,000,000 |
| Previously Paid Amount | 0 |
| Total Fee Amount | 8,708.4 |
| Total Offset Amount | 909.09 |
| Net Fee | $ 7,799.31 |
