Regulatory Capital (Tables)

3 Months Ended

Mar. 31, 2015

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)
March 31, 2015
Total Capital to Risk-Weighted Assets:
Corporation	$	727,090	13.0	%	$	446,173	8.0	%	N/A		N/A
Chemical Bank	676,488		12.1		445,471		8.0		$	556,838	10.0	%
Tier 1 Capital to Risk-Weighted Assets:
Corporation	657,307		11.8		334,630		6.0		N/A		N/A
Chemical Bank	606,813		10.9		334,103		6.0		445,471		8.0
Common Equity Tier 1 Capital to Risk-Weighted Assets:
Corporation	657,307		11.8		250,972		4.5		N/A		N/A
Chemical Bank	606,813		10.9		250,577		4.5		361,945		6.5
Leverage Ratio:
Corporation	657,307		9.1		289,948		4.0		N/A		N/A
Chemical Bank	606,813		8.4		289,840		4.0		362,300		5.0
December 31, 2014
Total Capital to Risk-Weighted Assets:
Corporation	$	705,130	12.4	%	$	456,302	8.0	%	N/A		N/A
Chemical Bank	654,031		11.5		455,633		8.0		$	569,541	10.0	%
Tier 1 Capital to Risk-Weighted Assets:
Corporation	633,779		11.1		228,151		4.0		N/A		N/A
Chemical Bank	582,783		10.2		227,816		4.0		341,725		6.0
Leverage Ratio:
Corporation	633,779		9.3		273,226		4.0		N/A		N/A
Chemical Bank	582,783		8.5		273,048		4.0		341,310		5.0
March 31, 2014
Total Capital to Risk-Weighted Assets:
Corporation	$	659,644	13.8	%	$	381,146	8.0	%	N/A		N/A
Chemical Bank	589,254		12.4		380,542		8.0		$	475,678	10.0	%
Tier 1 Capital to Risk-Weighted Assets:
Corporation	599,856		12.6		190,573		4.0		N/A		N/A
Chemical Bank	529,560		11.1		190,271		4.0		285,407		6.0
Leverage Ratio:
Corporation	599,856		9.9		243,070		4.0		N/A		N/A
Chemical Bank	529,560		8.7		242,939		4.0		303,673		5.0