Name:	chfc_AssetAtFairValueChangesInAccountingPolicy
Namespace Prefix:	chfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The value of the principal balance outstanding on loans sold to a third party and serviced by the company.

No definition available.

Name:	chfc_PrincipalBalanceOfLoansServiced
Namespace Prefix:	chfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The value of new servicing assets from transfers, subsequently measured at fair value, acquired or created during the current period through purchases or from transfers of financial assets.

No definition available.

Name:	chfc_ServicingAssetAtFairValueAdditionsFromTransfers
Namespace Prefix:	chfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Servicing Asset At Fair Value, Changes In Fair Value [Abstract]

No definition available.

Name:	chfc_ServicingAssetAtFairValueChangesInFairValueAbstract
Namespace Prefix:	chfc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The net increase (decrease) in fair value as a result of reductions from loans paid off used to calculate the fair value of servicing assets.

No definition available.

Name:	chfc_ServicingAssetAtFairValueChangesInFairValueResultingFromReductionsInLoansPaidOff
Namespace Prefix:	chfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

No definition available.

Name:	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122625-111746

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

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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

Amount of increase (decrease) in fair value from changes in the inputs, assumptions, or model used to calculate the fair value of the contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 3
-Subparagraph (a)(4)(i)
-URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122625-111746

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

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.

No definition available.