    <SEC-DOCUMENT>0001564590-18-017651-index.html : 20180727
    <SEC-HEADER>0001564590-18-017651.hdr.sgml : 20180727
    <ACCEPTANCE-DATETIME>20180726180847
    ACCESSION NUMBER:		0001564590-18-017651
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		16
    CONFORMED PERIOD OF REPORT:	20180727
    ITEM INFORMATION:		Regulation FD Disclosure
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20180727
    DATE AS OF CHANGE:		20180726

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			BYLINE BANCORP, INC.
    		CENTRAL INDEX KEY:			0001702750
    		STANDARD INDUSTRIAL CLASSIFICATION:	STATE COMMERCIAL BANKS [6022]
    		IRS NUMBER:				363012593

    	FILING VALUES:
    		FORM TYPE:		8-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-38139
    		FILM NUMBER:		18972733

    	BUSINESS ADDRESS:
    		BUSINESS PHONE:		773-244-7000

    	MAIL ADDRESS:
    		STREET 1:		180 NORTH LASALLE STREET, SUITE 300
    		CITY:			CHICAGO
    		STATE:			IL
    		ZIP:			60601
    </SEC-HEADER>
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    <TYPE>8-K
    <SEQUENCE>1
    <FILENAME>by-8k_20180726.htm
    <DESCRIPTION>8-K
    <TEXT>
    Document 1 - file: by-8k_20180726.htm

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    <DOCUMENT>
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    <SEQUENCE>2
    <FILENAME>by-ex991_7.htm
    <DESCRIPTION>EX-99.1
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    Document 2 - file: by-ex991_7.htm

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    <SEQUENCE>3
    <FILENAME>gssk4eignjj1000013.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: gssk4eignjj1000013.jpg

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    <SEQUENCE>4
    <FILENAME>gssk4eignjj1000004.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 4 - file: gssk4eignjj1000004.jpg

    </DOCUMENT>
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    <SEQUENCE>5
    <FILENAME>gssk4eignjj1000006.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 5 - file: gssk4eignjj1000006.jpg

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    <SEQUENCE>6
    <FILENAME>gssk4eignjj1000002.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 6 - file: gssk4eignjj1000002.jpg

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    <FILENAME>gssk4eignjj1000010.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 7 - file: gssk4eignjj1000010.jpg

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    <SEQUENCE>8
    <FILENAME>gssk4eignjj1000012.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 8 - file: gssk4eignjj1000012.jpg

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    <SEQUENCE>9
    <FILENAME>gssk4eignjj1000009.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 9 - file: gssk4eignjj1000009.jpg

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    <SEQUENCE>10
    <FILENAME>gssk4eignjj1000005.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 10 - file: gssk4eignjj1000005.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>gssk4eignjj1000014.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 11 - file: gssk4eignjj1000014.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>gssk4eignjj1000001.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 12 - file: gssk4eignjj1000001.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>gssk4eignjj1000008.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 13 - file: gssk4eignjj1000008.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>gssk4eignjj1000003.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 14 - file: gssk4eignjj1000003.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>gssk4eignjj1000007.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 15 - file: gssk4eignjj1000007.jpg

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    <DOCUMENT>
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    <SEQUENCE>16
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    <TEXT>
    Document 16 - file: gssk4eignjj1000011.jpg

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