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|---|---|---|
 0001193125-25-284607-index-headers.html | 2025-11-17 16:06:29 | |
| 0001193125-25-284607-index.html | 2025-11-17 16:06:29 | |
| 0001193125-25-284607.txt | 2025-11-17 16:06:29 | |
 0001193125-25-284607-xbrl.zip | 257735 | 2025-11-17 16:06:29 |
| FilingSummary.xml | 1724 | 2025-11-17 16:06:29 |
| fisi-20251114.htm | 55345 | 2025-11-17 16:06:29 |
| fisi-20251114.xsd | 25063 | 2025-11-17 16:06:29 |
| fisi-20251114_htm.xml | 4750 | 2025-11-17 16:06:29 |
| fisi-ex99_1.htm | 7807 | 2025-11-17 16:06:29 |
 img145321324_0.jpg | 323901 | 2025-11-17 16:06:29 |
 img40808888_0.jpg | 323901 | 2025-11-17 16:06:29 |
| MetaLinks.json | 18194 | 2025-11-17 16:06:29 |
| R1.htm | 39698 | 2025-11-17 16:06:29 |
| report.css | 2766 | 2025-11-17 16:06:29 |
| Show.js | 1084 | 2025-11-17 16:06:29 |