Loans (Details 8) (USD $) In Thousands, unless otherwise specified			9 Months Ended
Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 Commercial Real Estate [Member] Owner Occupied Nonfarmnonresidential [Member]
Number of Loans			1
Pre-Modification Outstanding Recorded Investment			$ 201
Post-Modification Outstanding Recorded Investment	12,400	26,600	201
TDRs Performing to Modified Terms			201
TDRs Not Performing to Modified Terms			$ 0

Reflects the amount of troubled restructed debt performing as per modified conditions.

No definition available.

Name:	cbin_FinancingReceivableModificationsPostModificationPerformingModifiedConditions
Namespace Prefix:	cbin_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.

+ References

No definition available.

+ Details

Name:	cbin_FinancingReceivableModificationsSubsequentDefaultsRecordedInvestment
Namespace Prefix:	cbin_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953676-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsNumberOfContracts1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of investment in financing receivables (after modification) modified by troubled debt restructurings.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of investment in financing receivables (before modification) modified by troubled debt restructurings.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant