Regulatory Capital (Tables)

9 Months Ended

Sep. 30, 2013

Banking and Thrift [Abstract]

Corporation's and Chemical Bank's actual capital amounts and ratios with the quantitative measures established by regulation to ensure capital adequacy

The summary below compares the Corporation’s and Chemical Bank’s actual capital amounts and ratios with the quantitative measures established by regulation to ensure capital adequacy:

	Actual				Minimum Required for Capital Adequacy Purposes				Required to be Well Capitalized Under Prompt Corrective Action Regulations
	Capital Amount		Ratio		Capital Amount		Ratio		Capital Amount		Ratio
	(Dollars in thousands)
September 30, 2013
Total Capital to Risk-Weighted Assets:
Corporation	$	638,786	14.2	%	$	361,199	8.0	%	N/A		N/A
Chemical Bank	568,626		12.6		360,617		8.0		$	450,771	10.0	%
Tier 1 Capital to Risk-Weighted Assets:
Corporation	582,039		12.9		180,600		4.0		N/A		N/A
Chemical Bank	511,969		11.4		180,309		4.0		270,463		6.0
Leverage Ratio:
Corporation	582,039		10.0		232,972		4.0		N/A		N/A
Chemical Bank	511,969		8.8		232,828		4.0		291,034		5.0
December 31, 2012
Total Capital to Risk-Weighted Assets:
Corporation	$	552,171	13.2	%	$	334,140	8.0	%	N/A		N/A
Chemical Bank	536,223		12.9		333,195		8.0		$	416,494	10.0	%
Tier 1 Capital to Risk-Weighted Assets:
Corporation	499,563		12.0		167,070		4.0		N/A		N/A
Chemical Bank	483,761		11.6		166,598		4.0		249,896		6.0
Leverage Ratio:
Corporation	499,563		9.2		217,145		4.0		N/A		N/A
Chemical Bank	483,761		8.9		216,784		4.0		270,980		5.0
September 30, 2012
Total Capital to Risk-Weighted Assets:
Corporation	$	549,388	13.6	%	$	322,212	8.0	%	N/A		N/A
Chemical Bank	537,467		13.4		321,585		8.0		$	401,982	10.0	%
Tier 1 Capital to Risk-Weighted Assets:
Corporation	498,618		12.4		161,106		4.0		N/A		N/A
Chemical Bank	486,794		12.1		160,793		4.0		241,189		6.0
Leverage Ratio:
Corporation	498,618		9.4		211,670		4.0		N/A		N/A
Chemical Bank	486,794		9.2		211,452		4.0		264,315		5.0