Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000712537-26-000013-index-headers.html | 2026-03-02 09:19:56 | |
| 0000712537-26-000013-index.html | 2026-03-02 09:19:56 | |
| 0000712537-26-000013.txt | 2026-03-02 09:19:56 | |
 0000712537-26-000013-xbrl.zip | 785712 | 2026-03-02 09:19:56 |
| fcf-20251231.htm | 7698421 | 2026-03-02 09:19:56 |
| fcf-20251231.xsd | 151058 | 2026-03-02 09:19:56 |
| fcf-20251231_cal.xml | 190477 | 2026-03-02 09:19:56 |
| fcf-20251231_def.xml | 891766 | 2026-03-02 09:19:56 |
 fcf-20251231_g1.jpg | 72742 | 2026-03-02 09:19:56 |
| fcf-20251231_htm.xml | 11900507 | 2026-03-02 09:19:56 |
| fcf-20251231_lab.xml | 1584860 | 2026-03-02 09:19:56 |
| fcf-20251231_pre.xml | 1338855 | 2026-03-02 09:19:56 |
| fcf-ex1027_20251231x10k.htm | 75155 | 2026-03-02 09:19:56 |
| fcf-ex1028_20251231x10k.htm | 76454 | 2026-03-02 09:19:56 |
| fcf-ex211_20251231x10xk.htm | 8187 | 2026-03-02 09:19:56 |
| fcf-ex231_20251231x10xk.htm | 4812 | 2026-03-02 09:19:56 |
| fcf-ex311_20251231x10k.htm | 10640 | 2026-03-02 09:19:56 |
| fcf-ex312_20251231x10k.htm | 10498 | 2026-03-02 09:19:56 |
| fcf-ex321_20251231x10k.htm | 3458 | 2026-03-02 09:19:56 |
| fcf-ex322_20251231x10k.htm | 3379 | 2026-03-02 09:19:56 |
| fcf-ex971_20251231x10xk.htm | 28188 | 2026-03-02 09:19:56 |
| FilingSummary.xml | 93737 | 2026-03-02 09:19:56 |
| MetaLinks.json | 2009265 | 2026-03-02 09:19:56 |
| R1.htm | 61281 | 2026-03-02 09:19:56 |
| R10.htm | 113890 | 2026-03-02 09:19:56 |
| R100.htm | 41232 | 2026-03-02 09:19:56 |
| R101.htm | 25312 | 2026-03-02 09:19:56 |
| R102.htm | 28760 | 2026-03-02 09:19:56 |
| R103.htm | 19900 | 2026-03-02 09:19:56 |
| R104.htm | 19162 | 2026-03-02 09:19:56 |
| R105.htm | 6671 | 2026-03-02 09:19:56 |
| R106.htm | 4770 | 2026-03-02 09:19:56 |
| R107.htm | 21916 | 2026-03-02 09:19:56 |
| R108.htm | 7900 | 2026-03-02 09:19:56 |
| R109.htm | 14649 | 2026-03-02 09:19:56 |
| R11.htm | 31049 | 2026-03-02 09:19:56 |
| R110.htm | 25715 | 2026-03-02 09:19:56 |
| R111.htm | 13962 | 2026-03-02 09:19:56 |
| R112.htm | 27284 | 2026-03-02 09:19:56 |
| R113.htm | 42714 | 2026-03-02 09:19:56 |
| R114.htm | 44798 | 2026-03-02 09:19:56 |
| R115.htm | 22762 | 2026-03-02 09:19:56 |
| R116.htm | 86075 | 2026-03-02 09:19:56 |
| R117.htm | 33512 | 2026-03-02 09:19:56 |
| R118.htm | 78027 | 2026-03-02 09:19:56 |
| R119.htm | 10834 | 2026-03-02 09:19:56 |
| R12.htm | 43123 | 2026-03-02 09:19:56 |
| R120.htm | 25711 | 2026-03-02 09:19:56 |
| R121.htm | 59957 | 2026-03-02 09:19:56 |
| R122.htm | 15877 | 2026-03-02 09:19:56 |
| R123.htm | 44194 | 2026-03-02 09:19:56 |
| R124.htm | 12663 | 2026-03-02 09:19:56 |
| R125.htm | 23533 | 2026-03-02 09:19:56 |
| R126.htm | 46364 | 2026-03-02 09:19:56 |
| R127.htm | 5093 | 2026-03-02 09:19:56 |
| R128.htm | 18034 | 2026-03-02 09:19:56 |
| R129.htm | 13860 | 2026-03-02 09:19:56 |
| R13.htm | 5935 | 2026-03-02 09:19:56 |
| R130.htm | 17076 | 2026-03-02 09:19:56 |
| R131.htm | 15681 | 2026-03-02 09:19:56 |
| R132.htm | 79275 | 2026-03-02 09:19:56 |
| R133.htm | 25199 | 2026-03-02 09:19:56 |
| R134.htm | 29801 | 2026-03-02 09:19:56 |
| R135.htm | 35179 | 2026-03-02 09:19:56 |
| R136.htm | 11321 | 2026-03-02 09:19:56 |
| R137.htm | 6200 | 2026-03-02 09:19:56 |
| R138.htm | 24270 | 2026-03-02 09:19:56 |
| R139.htm | 11831 | 2026-03-02 09:19:56 |
| R14.htm | 47477 | 2026-03-02 09:19:56 |
| R140.htm | 70813 | 2026-03-02 09:19:56 |
| R141.htm | 4829 | 2026-03-02 09:19:56 |
| R142.htm | 67609 | 2026-03-02 09:19:56 |
| R143.htm | 63229 | 2026-03-02 09:19:56 |
| R144.htm | 92657 | 2026-03-02 09:19:56 |
| R145.htm | 67053 | 2026-03-02 09:19:56 |
| R146.htm | 10023 | 2026-03-02 09:19:56 |
| R147.htm | 69358 | 2026-03-02 09:19:56 |
| R15.htm | 216630 | 2026-03-02 09:19:56 |
| R16.htm | 3580826 | 2026-03-02 09:19:56 |
| R17.htm | 16929 | 2026-03-02 09:19:56 |
| R18.htm | 43136 | 2026-03-02 09:19:56 |
| R19.htm | 38743 | 2026-03-02 09:19:56 |
| R2.htm | 7841 | 2026-03-02 09:19:56 |
| R20.htm | 33536 | 2026-03-02 09:19:56 |
| R21.htm | 28605 | 2026-03-02 09:19:56 |
| R22.htm | 51394 | 2026-03-02 09:19:56 |
| R23.htm | 25956 | 2026-03-02 09:19:56 |
| R24.htm | 26418 | 2026-03-02 09:19:56 |
| R25.htm | 197018 | 2026-03-02 09:19:56 |
| R26.htm | 98874 | 2026-03-02 09:19:56 |
| R27.htm | 87663 | 2026-03-02 09:19:56 |
| R28.htm | 73770 | 2026-03-02 09:19:56 |
| R29.htm | 5917 | 2026-03-02 09:19:56 |
| R3.htm | 148842 | 2026-03-02 09:19:56 |
| R30.htm | 35998 | 2026-03-02 09:19:56 |
| R31.htm | 12493 | 2026-03-02 09:19:56 |
| R32.htm | 89617 | 2026-03-02 09:19:56 |
| R33.htm | 10699 | 2026-03-02 09:19:56 |
| R34.htm | 84313 | 2026-03-02 09:19:56 |
| R35.htm | 51969 | 2026-03-02 09:19:56 |
| R36.htm | 8466 | 2026-03-02 09:19:56 |
| R37.htm | 104276 | 2026-03-02 09:19:56 |
| R38.htm | 102089 | 2026-03-02 09:19:56 |
| R39.htm | 124995 | 2026-03-02 09:19:56 |
| R4.htm | 163803 | 2026-03-02 09:19:56 |
| R40.htm | 30517 | 2026-03-02 09:19:56 |
| R41.htm | 44991 | 2026-03-02 09:19:56 |
| R42.htm | 35902 | 2026-03-02 09:19:56 |
| R43.htm | 206474 | 2026-03-02 09:19:56 |
| R44.htm | 1778656 | 2026-03-02 09:19:56 |
| R45.htm | 11729 | 2026-03-02 09:19:56 |
| R46.htm | 42722 | 2026-03-02 09:19:56 |
| R47.htm | 36071 | 2026-03-02 09:19:56 |
| R48.htm | 33318 | 2026-03-02 09:19:56 |
| R49.htm | 17512 | 2026-03-02 09:19:56 |
| R5.htm | 44830 | 2026-03-02 09:19:56 |
| R50.htm | 53792 | 2026-03-02 09:19:56 |
| R51.htm | 20782 | 2026-03-02 09:19:56 |
| R52.htm | 25202 | 2026-03-02 09:19:56 |
| R53.htm | 181838 | 2026-03-02 09:19:56 |
| R54.htm | 99615 | 2026-03-02 09:19:56 |
| R55.htm | 160267 | 2026-03-02 09:19:56 |
| R56.htm | 62592 | 2026-03-02 09:19:56 |
| R57.htm | 23156 | 2026-03-02 09:19:56 |
| R58.htm | 8821 | 2026-03-02 09:19:56 |
| R59.htm | 80833 | 2026-03-02 09:19:56 |
| R6.htm | 86410 | 2026-03-02 09:19:56 |
| R60.htm | 88045 | 2026-03-02 09:19:56 |
| R61.htm | 44586 | 2026-03-02 09:19:56 |
| R62.htm | 17167 | 2026-03-02 09:19:56 |
| R63.htm | 62915 | 2026-03-02 09:19:56 |
| R64.htm | 32955 | 2026-03-02 09:19:56 |
| R65.htm | 61333 | 2026-03-02 09:19:56 |
| R66.htm | 76746 | 2026-03-02 09:19:56 |
| R67.htm | 93363 | 2026-03-02 09:19:56 |
| R68.htm | 45580 | 2026-03-02 09:19:56 |
| R69.htm | 34364 | 2026-03-02 09:19:56 |
| R7.htm | 116265 | 2026-03-02 09:19:56 |
| R70.htm | 37968 | 2026-03-02 09:19:56 |
| R71.htm | 18166 | 2026-03-02 09:19:56 |
| R72.htm | 4041 | 2026-03-02 09:19:56 |
| R73.htm | 53104 | 2026-03-02 09:19:56 |
| R74.htm | 28759 | 2026-03-02 09:19:56 |
| R75.htm | 26388 | 2026-03-02 09:19:56 |
| R76.htm | 40055 | 2026-03-02 09:19:56 |
| R77.htm | 77223 | 2026-03-02 09:19:56 |
| R78.htm | 44118 | 2026-03-02 09:19:56 |
| R79.htm | 18297 | 2026-03-02 09:19:56 |
| R8.htm | 46119 | 2026-03-02 09:19:56 |
| R80.htm | 41280 | 2026-03-02 09:19:56 |
| R81.htm | 50192 | 2026-03-02 09:19:56 |
| R82.htm | 52203 | 2026-03-02 09:19:56 |
| R83.htm | 64669 | 2026-03-02 09:19:56 |
| R84.htm | 247203 | 2026-03-02 09:19:56 |
| R85.htm | 635787 | 2026-03-02 09:19:56 |
| R86.htm | 46731 | 2026-03-02 09:19:56 |
| R87.htm | 214487 | 2026-03-02 09:19:56 |
| R88.htm | 139137 | 2026-03-02 09:19:56 |
| R89.htm | 15643 | 2026-03-02 09:19:56 |
| R9.htm | 116972 | 2026-03-02 09:19:56 |
| R90.htm | 149615 | 2026-03-02 09:19:56 |
| R91.htm | 187948 | 2026-03-02 09:19:56 |
| R92.htm | 115730 | 2026-03-02 09:19:56 |
| R93.htm | 18352 | 2026-03-02 09:19:56 |
| R94.htm | 14441 | 2026-03-02 09:19:56 |
| R95.htm | 16925 | 2026-03-02 09:19:56 |
| R96.htm | 41890 | 2026-03-02 09:19:56 |
| R97.htm | 14421 | 2026-03-02 09:19:56 |
| R98.htm | 19532 | 2026-03-02 09:19:56 |
| R99.htm | 22147 | 2026-03-02 09:19:56 |
| report.css | 2768 | 2026-03-02 09:19:56 |
| Show.js | 1086 | 2026-03-02 09:19:56 |