Regulatory Capital (Tables)

3 Months Ended

Mar. 31, 2016

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 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, 2016
Total Capital to Risk-Weighted Assets:
Corporation	$	832,457	11.5	%	$	577,668	8.0	%	N/A		N/A
Chemical Bank	840,372		11.7		576,068		8.0		$	720,086	10.0	%
Tier 1 Capital to Risk-Weighted Assets:
Corporation	762,139		10.6		433,251		6.0		N/A		N/A
Chemical Bank	770,054		10.7		432,051		6.0		576,068		8.0
Common Equity Tier 1 Capital to Risk-Weighted Assets:
Corporation	762,139		10.6		324,938		4.5		N/A		N/A
Chemical Bank	770,054		10.7		324,038		4.5		468,056		6.5
Leverage Ratio:
Corporation	762,139		8.5		357,773		4.0		N/A		N/A
Chemical Bank	770,054		8.6		357,190		4.0		446,488		5.0
December 31, 2015
Total Capital to Risk-Weighted Assets:
Corporation	$	841,257	11.8	%	$	571,509	8.0	%	N/A		N/A
Chemical Bank	830,294		11.7		570,073		8.0		$	712,591	10.0	%
Tier 1 Capital to Risk-Weighted Assets:
Corporation	767,929		10.7		428,631		6.0		N/A		N/A
Chemical Bank	756,966		10.6		427,555		6.0		570,073		8.0
Common Equity Tier 1 Capital to Risk-Weighted Assets:
Corporation	753,815		10.6		321,474		4.5		N/A		N/A
Chemical Bank	756,966		10.6		320,666		4.5		463,184		6.5
Leverage Ratio:
Corporation	767,929		8.6		356,396		4.0		N/A		N/A
Chemical Bank	756,966		8.5		355,911		4.0		444,888		5.0
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