Name:	chfc_FairValueMeasurementsTextualAbstract
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Intangible Asset, Impaired, Accumulated Impairment Loss

+ References

No definition available.

+ Details

Name:	chfc_IntangibleAssetImpairedAccumulatedImpairmentLoss
Namespace Prefix:	chfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage of discount factors used to determine fair value.

+ References

No definition available.

+ Details

Name:	chfc_PercentageOfDiscountFactorsUsedToDetermineFairValue
Namespace Prefix:	chfc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The accumulated impairment losses related to goodwill as of the balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a,h)

-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267

+ Details

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

- Definition

This element represents the aggregate of the liabilities reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

+ Details

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Fair Value Measurements (Textual) (Details) (USD $) In Thousands, unless otherwise specified							3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Mar. 31, 2013 Core deposit intangible assets [Member]	Dec. 31, 2012 Core deposit intangible assets [Member]	Mar. 31, 2012 Core deposit intangible assets [Member]	Mar. 31, 2013 Maximum [Member]	Mar. 31, 2013 Minimum [Member]	Mar. 31, 2013 Other Real Estate and Repossessed Assets [Member] Maximum [Member]	Mar. 31, 2013 Other Real Estate and Repossessed Assets [Member] Minimum [Member]	Mar. 31, 2013 Fair Value Measurements Recurring [Member]	Dec. 31, 2012 Fair Value Measurements Recurring [Member]	Mar. 31, 2012 Fair Value Measurements Recurring [Member]	Mar. 31, 2013 Fair Value Measurements Nonrecurring [Member]	Dec. 31, 2012 Fair Value Measurements Nonrecurring [Member]	Mar. 31, 2012 Fair Value Measurements Nonrecurring [Member]
Fair Value Measurements (Textual) [Abstract]
Liabilities recorded at fair value											$ 0	$ 0	$ 0	$ 0	$ 0	$ 0
Expected life of intangible assets							15 years	10 years
Percentage of discount factors used to determine fair value							80.00%	70.00%	75.00%	70.00%
Impairment of goodwill	0	0	0
Impairment identified for intangible assets				$ 0	$ 0	$ 0