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Subordinated Debentures Subordinated Debentures Outstanding | 9 Months Ended
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Sep. 30, 2025
Subordinated Debentures Outstanding [Abstract] |
Subordinated Borrowings Disclosure [Text Block] | Subordinated Debentures Subordinated debentures outstanding are as follows:
|  |  |  |  |  | September 30, 2025 |  | December 31, 2024
| Due | Rate |  |  |  | Amount |  |  |  | Amount |  |
|  |  |  |  |  | (dollars in thousands)
Owed to: |  |  |  |  |  |  |  |  |  |  |  |
First Commonwealth Bank | 2033 | 5.50% until June 1, 2028, then 3-Month CME Term SOFR + 0.26161% + 2.37% |  |  |  | $ | 49,463 |  |  |  |  | $ | 49,411 |  |  |
First Commonwealth Financial Corp | 2031 | 4.50% until March 29, 2026, then Prime + 1.00% |  |  |  | 6,795 |  |  |  |  | 6,727 |  |  |
First Commonwealth Capital Trust II | 2034 | 3-Month CME Term SOFR + 0.26161% + 2.85% |  |  |  | 30,929 |  |  |  |  | 30,929 |  |  |
First Commonwealth Capital Trust III | 2034 | 3-Month CME Term SOFR + 0.26161% + 2.85% |  |  |  | 41,238 |  |  |  |  | 41,238 |  |  |
Total |  |  |  |  |  | $ | 128,425 |  |  |  |  | $ | 128,305 |  |  |
With the acquisition of Centric in January 2023, First Commonwealth acquired a ten-year subordinated note with a principal balance of $6.0 million. The rate remains fixed at 4.50% until March 29, 2026, then adjusts quarterly to Prime + 1.00%. The Bank may redeem the notes, beginning with the interest payment due on March 29, 2026, in whole or in part at a redemption price equal to 100% of the principal amount of the subordinated notes, plus accrued and unpaid interest to the date of redemption. A fair value premium of $0.6 million was recognized in connection with the acquisition. On May 21, 2018, First Commonwealth issued fifteen-year subordinated notes with an aggregate principal amount of $50.0 million and a fixed-to-floating rate of 5.50%. The rate remains fixed until June 1, 2028, then adjusts on a quarterly basis to three-month CME Term SOFR+ 0.26161% + 2.37%. The Bank may redeem the notes, subject to regulatory approval, beginning with the interest payment due on June 1, 2028, in whole or in part at a redemption price equal to 100% of the principal amount of the subordinated notes, plus accrued and unpaid interest to the date of redemption. Deferred issuance costs of $1.1 million are being amortized on a straight-line basis over the term of the notes. First Commonwealth currently has two trusts, First Commonwealth Capital Trust II and First Commonwealth Capital Trust III, of which 100% of the common equity is owned by First Commonwealth. The trusts were formed for the purpose of issuing company obligated mandatorily redeemable capital securities to third-party investors and investing the proceeds from the sale of the capital securities solely in junior subordinated debt securities (“subordinated debentures”) of First Commonwealth. The subordinated debentures held by each trust are the sole assets of the trust. Interest on the debentures issued to First Commonwealth Capital Trust II is paid quarterly at a floating rate of three-month CME Term SOFR + 0.26161% + 2.85%, which is reset quarterly. Subject to regulatory approval, First Commonwealth may redeem the debentures, in whole or in part, at its option at a redemption price equal to 100% of the principal amount of the debentures, plus accrued and unpaid interest to the date of the redemption. Deferred issuance costs of $0.5 million are being amortized on a straight-line basis over the term of the securities. Interest on the debentures issued to First Commonwealth Capital Trust III is paid quarterly at a floating rate of three-month CME Term SOFR + 0.26161% + 2.85%, which is reset quarterly. Subject to regulatory approval, First Commonwealth may redeem the debentures, in whole or in part, at its option on any interest payment date at a redemption price equal to 100% of the principal amount of the debentures, plus accrued and unpaid interest to the date of the redemption. Deferred issuance costs of $0.6 million are being amortized on a straight-line basis over the term of the securities. In order to reduce its exposure to variability in expected future cash flows related to interest payments on First Commonwealth Capital Trust II and III, the Company entered into two interest rate swap contracts that are designated as cash flow hedges. These contracts fix the index rate based portion of the interest rate on Capital Trust III at 1.525% until August 15, 2026. A similar interest rate swap contract was entered for Capital Trust II which fixed the index rate based portion at 1.515%; however, that swap expired on August 15, 2024. Additional information related to these cash flow hedges can be found in Note 12 - "Derivatives".

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- Definition Subordinated Debentures Outstanding [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for borrowings under subordinated debt agreements that qualify as available in computing net capital under SEC's uniform net capital rule, including restrictive covenants, collateral, interest rates and due dates, amounts due by date and amount owed in total. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 470 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478878/942-470-45-1 + Details
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