XML 66 R51.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Subordinated Debentures (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2018
Disclosure Subordinated Debentures [Abstract] |
Subordinated Debentures Outstanding | Subordinated debentures outstanding at December 31 are as follows:
|  |  | 2018 |  | 2017
| Due |  | Amount |  | Rate |  | Amount |  | Rate
|  |  | (dollars in thousands)
Owed to: |  |  |  |  |  |  |  |  |
First Commonwealth Bank | 2028 |  | $ | 49,131 |  |  | 4.875% until June 1, 2023, then LIBOR + 1.845% |  |  |  |
First Commonwealth Bank | 2033 |  | $ | 48,990 |  |  | 5.50% until June 1, 2028, then LIBOR + 2.37% |  |  |  |
First Commonwealth Capital Trust II | 2034 |  | $ | 30,929 |  |  | LIBOR + 2.85 |  | $ | 30,929 |  |  | LIBOR + 2.85
First Commonwealth Capital Trust III | 2034 |  | 41,238 |  |  | LIBOR + 2.85 |  | 41,238 |  |  | LIBOR + 2.85
Total |  |  | $ | 170,288 |  |  |  |  | $ | 72,167 |  |  |

X
- Definition Disclosure - Subordinated Debentures [Abstract] + References No definition available. + Details
Name: | fcf_DisclosureSubordinatedDebenturesAbstract
Namespace Prefix: | fcf_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of borrowings under subordinated debt agreements that qualify as available in computing net capital under SEC uniform net capital rules for broker-dealers, 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 -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
Name: | us-gaap_ScheduleOfSubordinatedBorrowingTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration