Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000950170-24-120679-index-headers.html | 2024-11-04 16:05:43 | |
| 0000950170-24-120679-index.html | 2024-11-04 16:05:43 | |
| 0000950170-24-120679.txt | 2024-11-04 16:05:43 | |
 0000950170-24-120679-xbrl.zip | 769993 | 2024-11-04 16:05:43 |
| FilingSummary.xml | 68464 | 2024-11-04 16:05:43 |
| Financial_Report.xlsx | 186902 | 2024-11-04 16:05:43 |
| fisi-20240930.htm | 8476568 | 2024-11-04 16:05:43 |
| fisi-20240930.xsd | 2005784 | 2024-11-04 16:05:43 |
| fisi-20240930_htm.xml | 10245013 | 2024-11-04 16:05:43 |
| fisi-ex31_1.htm | 14520 | 2024-11-04 16:05:43 |
| fisi-ex31_2.htm | 14491 | 2024-11-04 16:05:43 |
| fisi-ex32.htm | 17365 | 2024-11-04 16:05:43 |
 img39863322_0.jpg | 323901 | 2024-11-04 16:05:43 |
| MetaLinks.json | 1324114 | 2024-11-04 16:05:43 |
| R1.htm | 51555 | 2024-11-04 16:05:43 |
| R10.htm | 8479 | 2024-11-04 16:05:43 |
| R11.htm | 38525 | 2024-11-04 16:05:43 |
| R12.htm | 61331 | 2024-11-04 16:05:43 |
| R13.htm | 509100 | 2024-11-04 16:05:43 |
| R14.htm | 1937798 | 2024-11-04 16:05:43 |
| R15.htm | 94011 | 2024-11-04 16:05:43 |
| R16.htm | 47326 | 2024-11-04 16:05:43 |
| R17.htm | 51460 | 2024-11-04 16:05:43 |
| R18.htm | 135456 | 2024-11-04 16:05:43 |
| R19.htm | 110554 | 2024-11-04 16:05:43 |
| R2.htm | 100175 | 2024-11-04 16:05:43 |
| R20.htm | 369888 | 2024-11-04 16:05:43 |
| R21.htm | 50088 | 2024-11-04 16:05:43 |
| R22.htm | 44530 | 2024-11-04 16:05:43 |
| R23.htm | 37687 | 2024-11-04 16:05:43 |
| R24.htm | 396771 | 2024-11-04 16:05:43 |
| R25.htm | 163711 | 2024-11-04 16:05:43 |
| R26.htm | 47984 | 2024-11-04 16:05:43 |
| R27.htm | 20800 | 2024-11-04 16:05:43 |
| R28.htm | 59572 | 2024-11-04 16:05:43 |
| R29.htm | 487705 | 2024-11-04 16:05:43 |
| R3.htm | 38598 | 2024-11-04 16:05:43 |
| R30.htm | 1931687 | 2024-11-04 16:05:43 |
| R31.htm | 94007 | 2024-11-04 16:05:43 |
| R32.htm | 42269 | 2024-11-04 16:05:43 |
| R33.htm | 51095 | 2024-11-04 16:05:43 |
| R34.htm | 130557 | 2024-11-04 16:05:43 |
| R35.htm | 107117 | 2024-11-04 16:05:43 |
| R36.htm | 370606 | 2024-11-04 16:05:43 |
| R37.htm | 45782 | 2024-11-04 16:05:43 |
| R38.htm | 39141 | 2024-11-04 16:05:43 |
| R39.htm | 26616 | 2024-11-04 16:05:43 |
| R4.htm | 132216 | 2024-11-04 16:05:43 |
| R40.htm | 371938 | 2024-11-04 16:05:43 |
| R41.htm | 156569 | 2024-11-04 16:05:43 |
| R42.htm | 14862 | 2024-11-04 16:05:43 |
| R43.htm | 16180 | 2024-11-04 16:05:43 |
| R44.htm | 38615 | 2024-11-04 16:05:43 |
| R45.htm | 5558 | 2024-11-04 16:05:43 |
| R46.htm | 77121 | 2024-11-04 16:05:43 |
| R47.htm | 80627 | 2024-11-04 16:05:43 |
| R48.htm | 58951 | 2024-11-04 16:05:43 |
| R49.htm | 63095 | 2024-11-04 16:05:43 |
| R5.htm | 34802 | 2024-11-04 16:05:43 |
| R50.htm | 58422 | 2024-11-04 16:05:43 |
| R51.htm | 24918 | 2024-11-04 16:05:43 |
| R52.htm | 107142 | 2024-11-04 16:05:43 |
| R53.htm | 34217 | 2024-11-04 16:05:43 |
| R54.htm | 8041 | 2024-11-04 16:05:43 |
| R55.htm | 67166 | 2024-11-04 16:05:43 |
| R56.htm | 26151 | 2024-11-04 16:05:43 |
| R57.htm | 159904 | 2024-11-04 16:05:43 |
| R58.htm | 88432 | 2024-11-04 16:05:43 |
| R59.htm | 52762 | 2024-11-04 16:05:43 |
| R6.htm | 98856 | 2024-11-04 16:05:43 |
| R60.htm | 12154 | 2024-11-04 16:05:43 |
| R61.htm | 15293 | 2024-11-04 16:05:43 |
| R62.htm | 18951 | 2024-11-04 16:05:43 |
| R63.htm | 21032 | 2024-11-04 16:05:43 |
| R64.htm | 14742 | 2024-11-04 16:05:43 |
| R65.htm | 18254 | 2024-11-04 16:05:43 |
| R66.htm | 22647 | 2024-11-04 16:05:43 |
| R67.htm | 35598 | 2024-11-04 16:05:43 |
| R68.htm | 27529 | 2024-11-04 16:05:43 |
| R69.htm | 4592 | 2024-11-04 16:05:43 |
| R7.htm | 13070 | 2024-11-04 16:05:43 |
| R70.htm | 44312 | 2024-11-04 16:05:43 |
| R71.htm | 7371 | 2024-11-04 16:05:43 |
| R72.htm | 16932 | 2024-11-04 16:05:43 |
| R73.htm | 34174 | 2024-11-04 16:05:43 |
| R74.htm | 6932 | 2024-11-04 16:05:43 |
| R75.htm | 62139 | 2024-11-04 16:05:43 |
| R76.htm | 45806 | 2024-11-04 16:05:43 |
| R77.htm | 73061 | 2024-11-04 16:05:43 |
| R78.htm | 10935 | 2024-11-04 16:05:43 |
| R79.htm | 18007 | 2024-11-04 16:05:43 |
| R8.htm | 88927 | 2024-11-04 16:05:43 |
| R80.htm | 19890 | 2024-11-04 16:05:43 |
| R81.htm | 24046 | 2024-11-04 16:05:43 |
| R82.htm | 5813 | 2024-11-04 16:05:43 |
| R83.htm | 9580 | 2024-11-04 16:05:43 |
| R84.htm | 7135 | 2024-11-04 16:05:43 |
| R85.htm | 10722 | 2024-11-04 16:05:43 |
| R86.htm | 75175 | 2024-11-04 16:05:43 |
| R87.htm | 20991 | 2024-11-04 16:05:43 |
| R88.htm | 34988 | 2024-11-04 16:05:43 |
| R89.htm | 90447 | 2024-11-04 16:05:43 |
| R9.htm | 15348 | 2024-11-04 16:05:43 |
| R90.htm | 4858 | 2024-11-04 16:05:43 |
| R91.htm | 25291 | 2024-11-04 16:05:43 |
| R92.htm | 48377 | 2024-11-04 16:05:43 |
| report.css | 2768 | 2024-11-04 16:05:43 |
| Show.js | 1086 | 2024-11-04 16:05:43 |