<SEC-DOCUMENT>0001193125-20-305683-index.html : 20201130
<SEC-HEADER>0001193125-20-305683.hdr.sgml : 20201130
<ACCEPTANCE-DATETIME>20201130165129
ACCESSION NUMBER:		0001193125-20-305683
CONFORMED SUBMISSION TYPE:	S-4
PUBLIC DOCUMENT COUNT:		9
FILED AS OF DATE:		20201130
DATE AS OF CHANGE:		20201130

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			FINANCIAL INSTITUTIONS INC
		CENTRAL INDEX KEY:			0000862831
		STANDARD INDUSTRIAL CLASSIFICATION:	NATIONAL COMMERCIAL BANKS [6021]
		IRS NUMBER:				160816610
		STATE OF INCORPORATION:			NY
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		S-4
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-251030
		FILM NUMBER:		201358675

	BUSINESS ADDRESS:	
		STREET 1:		220 LIBERTY STREET
		CITY:			WARSAW
		STATE:			NY
		ZIP:			14569
		BUSINESS PHONE:		5857861100

	MAIL ADDRESS:	
		STREET 1:		220 LIBERTY STREET
		CITY:			WARSAW
		STATE:			NY
		ZIP:			14569
</SEC-HEADER>
<DOCUMENT>
<TYPE>S-4
<SEQUENCE>1
<FILENAME>d14939ds4.htm
<DESCRIPTION>FORM S-4
<TEXT>
Document 1 - file: d14939ds4.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-5.1
<SEQUENCE>2
<FILENAME>d14939dex51.htm
<DESCRIPTION>EX-5.1
<TEXT>
Document 2 - file: d14939dex51.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.1
<SEQUENCE>3
<FILENAME>d14939dex231.htm
<DESCRIPTION>EX-23.1
<TEXT>
Document 3 - file: d14939dex231.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.2
<SEQUENCE>4
<FILENAME>d14939dex232.htm
<DESCRIPTION>EX-23.2
<TEXT>
Document 4 - file: d14939dex232.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-25.1
<SEQUENCE>5
<FILENAME>d14939dex251.htm
<DESCRIPTION>EX-25.1
<TEXT>
Document 5 - file: d14939dex251.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>6
<FILENAME>d14939dex991.htm
<DESCRIPTION>EX-99.1
<TEXT>
Document 6 - file: d14939dex991.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>7
<FILENAME>g14939dsp1.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 7 - file: g14939dsp1.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>8
<FILENAME>g14939dsp2.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 8 - file: g14939dsp2.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>9
<FILENAME>g14939g50u27.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 9 - file: g14939g50u27.jpg

</DOCUMENT>
</SEC-DOCUMENT>