Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001564590-18-028005-index-headers.html | 2018-11-07 16:08:00 | |
| 0001564590-18-028005-index.html | 2018-11-07 16:08:00 | |
| 0001564590-18-028005.txt | 2018-11-07 16:08:00 | |
 0001564590-18-028005-xbrl.zip | 324147 | 2018-11-07 16:08:00 |
| FilingSummary.xml | 58399 | 2018-11-07 16:08:00 |
| Financial_Report.xlsx | 118788 | 2018-11-07 16:08:00 |
| fisi-10q_20180930.htm | 8119304 | 2018-11-07 16:08:00 |
| fisi-20180930.xml | 9888750 | 2018-11-07 16:08:00 |
| fisi-20180930.xsd | 62600 | 2018-11-07 16:08:00 |
| fisi-20180930_cal.xml | 108698 | 2018-11-07 16:08:00 |
| fisi-20180930_def.xml | 312984 | 2018-11-07 16:08:00 |
| fisi-20180930_lab.xml | 582473 | 2018-11-07 16:08:00 |
| fisi-20180930_pre.xml | 516062 | 2018-11-07 16:08:00 |
| fisi-ex311_7.htm | 18612 | 2018-11-07 16:08:00 |
| fisi-ex312_9.htm | 18490 | 2018-11-07 16:08:00 |
| fisi-ex32_6.htm | 15788 | 2018-11-07 16:08:00 |
 go2u1dpen5sh000001.jpg | 6835 | 2018-11-07 16:08:00 |
| R1.htm | 24093 | 2018-11-07 16:08:00 |
| R10.htm | 7451 | 2018-11-07 16:08:00 |
| R11.htm | 116384 | 2018-11-07 16:08:00 |
| R12.htm | 1063330 | 2018-11-07 16:08:00 |
| R13.htm | 1185212 | 2018-11-07 16:08:00 |
| R14.htm | 57355 | 2018-11-07 16:08:00 |
| R15.htm | 156026 | 2018-11-07 16:08:00 |
| R16.htm | 97403 | 2018-11-07 16:08:00 |
| R17.htm | 580154 | 2018-11-07 16:08:00 |
| R18.htm | 111770 | 2018-11-07 16:08:00 |
| R19.htm | 55522 | 2018-11-07 16:08:00 |
| R2.htm | 72518 | 2018-11-07 16:08:00 |
| R20.htm | 19333 | 2018-11-07 16:08:00 |
| R21.htm | 485191 | 2018-11-07 16:08:00 |
| R22.htm | 302144 | 2018-11-07 16:08:00 |
| R23.htm | 83276 | 2018-11-07 16:08:00 |
| R24.htm | 41939 | 2018-11-07 16:08:00 |
| R25.htm | 118654 | 2018-11-07 16:08:00 |
| R26.htm | 1061869 | 2018-11-07 16:08:00 |
| R27.htm | 1177935 | 2018-11-07 16:08:00 |
| R28.htm | 59218 | 2018-11-07 16:08:00 |
| R29.htm | 150678 | 2018-11-07 16:08:00 |
| R3.htm | 28645 | 2018-11-07 16:08:00 |
| R30.htm | 101043 | 2018-11-07 16:08:00 |
| R31.htm | 580964 | 2018-11-07 16:08:00 |
| R32.htm | 110843 | 2018-11-07 16:08:00 |
| R33.htm | 54577 | 2018-11-07 16:08:00 |
| R34.htm | 15448 | 2018-11-07 16:08:00 |
| R35.htm | 469360 | 2018-11-07 16:08:00 |
| R36.htm | 302350 | 2018-11-07 16:08:00 |
| R37.htm | 5945 | 2018-11-07 16:08:00 |
| R38.htm | 22225 | 2018-11-07 16:08:00 |
| R39.htm | 17513 | 2018-11-07 16:08:00 |
| R4.htm | 111986 | 2018-11-07 16:08:00 |
| R40.htm | 30873 | 2018-11-07 16:08:00 |
| R41.htm | 8026 | 2018-11-07 16:08:00 |
| R42.htm | 55033 | 2018-11-07 16:08:00 |
| R43.htm | 21232 | 2018-11-07 16:08:00 |
| R44.htm | 9130 | 2018-11-07 16:08:00 |
| R45.htm | 53872 | 2018-11-07 16:08:00 |
| R46.htm | 88149 | 2018-11-07 16:08:00 |
| R47.htm | 32142 | 2018-11-07 16:08:00 |
| R48.htm | 23099 | 2018-11-07 16:08:00 |
| R49.htm | 54539 | 2018-11-07 16:08:00 |
| R5.htm | 20882 | 2018-11-07 16:08:00 |
| R50.htm | 43947 | 2018-11-07 16:08:00 |
| R51.htm | 22473 | 2018-11-07 16:08:00 |
| R52.htm | 24988 | 2018-11-07 16:08:00 |
| R53.htm | 61657 | 2018-11-07 16:08:00 |
| R54.htm | 8156 | 2018-11-07 16:08:00 |
| R55.htm | 11561 | 2018-11-07 16:08:00 |
| R56.htm | 8756 | 2018-11-07 16:08:00 |
| R57.htm | 15354 | 2018-11-07 16:08:00 |
| R58.htm | 4722 | 2018-11-07 16:08:00 |
| R59.htm | 21946 | 2018-11-07 16:08:00 |
| R6.htm | 69835 | 2018-11-07 16:08:00 |
| R60.htm | 11866 | 2018-11-07 16:08:00 |
| R61.htm | 34955 | 2018-11-07 16:08:00 |
| R62.htm | 42813 | 2018-11-07 16:08:00 |
| R63.htm | 29672 | 2018-11-07 16:08:00 |
| R64.htm | 43344 | 2018-11-07 16:08:00 |
| R65.htm | 8986 | 2018-11-07 16:08:00 |
| R66.htm | 50769 | 2018-11-07 16:08:00 |
| R67.htm | 23375 | 2018-11-07 16:08:00 |
| R68.htm | 21144 | 2018-11-07 16:08:00 |
| R69.htm | 10254 | 2018-11-07 16:08:00 |
| R7.htm | 10146 | 2018-11-07 16:08:00 |
| R70.htm | 19300 | 2018-11-07 16:08:00 |
| R71.htm | 6614 | 2018-11-07 16:08:00 |
| R72.htm | 9662 | 2018-11-07 16:08:00 |
| R73.htm | 4087 | 2018-11-07 16:08:00 |
| R74.htm | 95623 | 2018-11-07 16:08:00 |
| R75.htm | 14943 | 2018-11-07 16:08:00 |
| R76.htm | 23156 | 2018-11-07 16:08:00 |
| R77.htm | 56144 | 2018-11-07 16:08:00 |
| R78.htm | 4104 | 2018-11-07 16:08:00 |
| R79.htm | 16737 | 2018-11-07 16:08:00 |
| R8.htm | 92757 | 2018-11-07 16:08:00 |
| R80.htm | 34576 | 2018-11-07 16:08:00 |
| R9.htm | 70376 | 2018-11-07 16:08:00 |
| report.css | 2767 | 2018-11-07 16:08:00 |
| Show.js | 1085 | 2018-11-07 16:08:00 |