Fair Value Measurements - Aggregate Fair Value, Contractual Balance, and Gain or Loss for Loans Held-For-Sale (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2017	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Aggregate fair value	$ 87,198	$ 81,830
Contractual balance	84,375	81,009
Unrealized gain (loss)	$ 2,823	$ 821

Represents the amount of unrealized gain (loss) of loans held for investment.

No definition available.

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