XML 82 R65.htm IDEA: XBRL DOCUMENT v3.3.1.900

Loans and Allowance for Loan Losses (Details 4) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) N	Dec. 31, 2014 USD ($) N
Financing Receivable, Modifications [Line Items]
Number of contracts | N	6	8
Pre-Modification Outstanding Recorded Investment	$ 634	$ 1,909
Post Modification Oustanding Recorded Investment	$ 634	$ 1,909
Number of Contracts | N	3	8
Post Modification Outstanding Recorded Investment - past due for 30 days or more	$ 400	$ 1,702
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts | N	4	5
Pre-Modification Outstanding Recorded Investment	$ 439	$ 1,596
Post Modification Oustanding Recorded Investment	$ 439	$ 1,596
Number of Contracts | N	3	6
Post Modification Outstanding Recorded Investment - past due for 30 days or more	$ 400	$ 1,592
Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts | N	2	2
Pre-Modification Outstanding Recorded Investment	$ 195	$ 281
Post Modification Oustanding Recorded Investment	$ 195	$ 281
Number of Contracts | N		2
Post Modification Outstanding Recorded Investment - past due for 30 days or more		$ 110
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts | N		1
Pre-Modification Outstanding Recorded Investment		$ 32
Post Modification Oustanding Recorded Investment		$ 32

X

- Definition

The number of loans relating to troubled debt restructurings.

+ References

No definition available.

+ Details

Name:	cofs_NumberOfLoans
Namespace Prefix:	cofs_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_FinancingReceivableModificationsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Post-modification amount of investment in financing receivables 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=66008989&loc=SL6953676-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Pre-modification amount of investment in financing receivables 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=66008989&loc=SL6953676-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953682-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953682-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=cofs_FinancingReceivableCommercialAndIndustrialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: