Significant Accounting Policies (Loans Acquired in a Business Combination) (Details) (USD $)	12 Months Ended
Dec. 31, 2013 Pools	Dec. 31, 2012	Apr. 30, 2010 OAK [Member]
Business Acquisition [Line Items]
Outstanding contractual principal balance of loans with deteriorated quality of acquired loan portfolio	$ 294,697,000	$ 392,595,000	$ 105,000,000
Outstanding contractual principal balance of loans without deteriorated quality of acquired loan portfolio			578,000,000
Outstanding contractual principal balance of acquired loan portfolio			$ 683,000,000
Number of pools of aggregate acquired loans based upon common risk characteristics	14

Financing Receivable, Acquired with Without Deteriorated Credit Quality

No definition available.

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

- Definition

Number of pools of aggregate acquired loans based upon common risk characteristics.

+ References

No definition available.

+ Details

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Namespace Prefix:	chfc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_BusinessAcquisitionLineItems
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Data Type:	xbrli:stringItemType
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Period Type:	duration

- Definition

For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the gross contractual amounts receivable, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)(2)

-URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472

+ Details

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

- Definition

The balance of financing receivables that were acquired with deteriorated credit quality.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (h)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524

+ Details

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