<SEC-DOCUMENT>0000357173-20-000042-index.html : 20200722
<SEC-HEADER>0000357173-20-000042.hdr.sgml : 20200722
<ACCEPTANCE-DATETIME>20200722164645
ACCESSION NUMBER:		0000357173-20-000042
CONFORMED SUBMISSION TYPE:	8-K
PUBLIC DOCUMENT COUNT:		20
CONFORMED PERIOD OF REPORT:	20200722
ITEM INFORMATION:		Results of Operations and Financial Condition
ITEM INFORMATION:		Financial Statements and Exhibits
FILED AS OF DATE:		20200722
DATE AS OF CHANGE:		20200722

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			OLD SECOND BANCORP INC
		CENTRAL INDEX KEY:			0000357173
		STANDARD INDUSTRIAL CLASSIFICATION:	STATE COMMERCIAL BANKS [6022]
		IRS NUMBER:				363143493
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		8-K
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-10537
		FILM NUMBER:		201041916

	BUSINESS ADDRESS:	
		STREET 1:		37 S RIVER ST
		CITY:			AURORA
		STATE:			IL
		ZIP:			60507
		BUSINESS PHONE:		6308920202

	MAIL ADDRESS:	
		STREET 1:		37 SOUTH RIVER STREET
		CITY:			AURORA
		STATE:			IL
		ZIP:			60507
</SEC-HEADER>
<DOCUMENT>
<TYPE>8-K
<SEQUENCE>1
<FILENAME>osbc-20200722x8k.htm
<DESCRIPTION>8-K
<TEXT>
Document 1 - file: osbc-20200722x8k.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>2
<FILENAME>osbc-20200722ex991b82582.htm
<DESCRIPTION>EX-99.1
<TEXT>
Document 2 - file: osbc-20200722ex991b82582.htm

</DOCUMENT>
<DOCUMENT>
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<SEQUENCE>3
<FILENAME>osbc-20200722ex99202aaa7.htm
<DESCRIPTION>EX-99.2
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Document 3 - file: osbc-20200722ex99202aaa7.htm

</DOCUMENT>
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<SEQUENCE>4
<FILENAME>osbc-20200722ex991b82582001.jpg
<DESCRIPTION>GRAPHIC
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Document 4 - file: osbc-20200722ex991b82582001.jpg

</DOCUMENT>
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<SEQUENCE>5
<FILENAME>osbc-20200722ex99202aaa7001.jpg
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Document 5 - file: osbc-20200722ex99202aaa7001.jpg

</DOCUMENT>
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<SEQUENCE>6
<FILENAME>osbc-20200722ex99202aaa7002.jpg
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Document 6 - file: osbc-20200722ex99202aaa7002.jpg

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<SEQUENCE>7
<FILENAME>osbc-20200722ex99202aaa7003.jpg
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Document 7 - file: osbc-20200722ex99202aaa7003.jpg

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<FILENAME>osbc-20200722ex99202aaa7004.jpg
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Document 8 - file: osbc-20200722ex99202aaa7004.jpg

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<FILENAME>osbc-20200722ex99202aaa7005.jpg
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Document 9 - file: osbc-20200722ex99202aaa7005.jpg

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<SEQUENCE>10
<FILENAME>osbc-20200722ex99202aaa7006.jpg
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Document 10 - file: osbc-20200722ex99202aaa7006.jpg

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<FILENAME>osbc-20200722ex99202aaa7007.jpg
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Document 11 - file: osbc-20200722ex99202aaa7007.jpg

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<FILENAME>osbc-20200722ex99202aaa7008.jpg
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Document 12 - file: osbc-20200722ex99202aaa7008.jpg

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<SEQUENCE>13
<FILENAME>osbc-20200722ex99202aaa7009.jpg
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<TEXT>
Document 13 - file: osbc-20200722ex99202aaa7009.jpg

</DOCUMENT>
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<SEQUENCE>14
<FILENAME>osbc-20200722ex99202aaa7010.jpg
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Document 14 - file: osbc-20200722ex99202aaa7010.jpg

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<SEQUENCE>15
<FILENAME>osbc-20200722ex99202aaa7011.jpg
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Document 15 - file: osbc-20200722ex99202aaa7011.jpg

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<SEQUENCE>16
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Document 16 - file: osbc-20200722ex99202aaa7012.jpg

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<SEQUENCE>17
<FILENAME>osbc-20200722ex99202aaa7013.jpg
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<TEXT>
Document 17 - file: osbc-20200722ex99202aaa7013.jpg

</DOCUMENT>
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<SEQUENCE>18
<FILENAME>osbc-20200722ex99202aaa7014.jpg
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Document 18 - file: osbc-20200722ex99202aaa7014.jpg

</DOCUMENT>
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<SEQUENCE>19
<FILENAME>osbc-20200722ex99202aaa7015.jpg
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<TEXT>
Document 19 - file: osbc-20200722ex99202aaa7015.jpg

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<SEQUENCE>20
<FILENAME>osbc-20200722x8k001.jpg
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<TEXT>
Document 20 - file: osbc-20200722x8k001.jpg

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</SEC-DOCUMENT>