Regulatory Capital and Reserve Requirements (Tables)

3 Months Ended

Mar. 31, 2019

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 Including Capital Conservation Buffer				Required to be Well Capitalized Under Prompt Corrective Action Regulations
(Dollars in thousands)	Capital Amount		Ratio		Capital Amount		Ratio		Capital Amount		Ratio
March 31, 2019
Total Capital to Risk-Weighted Assets
Corporation	$	1,896,830	11.7	%	$	1,698,868	10.5	%	N/A		N/A
Chemical Bank	1,872,628		11.6		1,695,932		10.5		$	1,615,173	10.0	%
Tier 1 Capital to Risk-Weighted Assets
Corporation	1,763,626		10.9		1,375,274		8.5		N/A		N/A
Chemical Bank	1,755,372		10.9		1,372,897		8.5		1,292,138		8.0
Common Equity Tier 1 Capital to Risk-Weighted Assets
Corporation	1,763,626		10.9		1,132,579		7.0		N/A		N/A
Chemical Bank	1,755,372		10.9		1,130,621		7.0		1,049,862		6.5
Leverage Ratio
Corporation	1,763,626		8.7		814,944		4.0		N/A		N/A
Chemical Bank	1,755,372		8.6		813,893		4.0		1,017,366		5.0
December 31, 2018
Total Capital to Risk-Weighted Assets
Corporation	$	1,855,922	11.5	%	$	1,590,323	9.9	%	N/A		N/A
Chemical Bank	1,825,742		11.4		1,586,719		9.9		$	1,606,804	10.0	%
Tier 1 Capital to Risk-Weighted Assets
Corporation	1,723,004		10.7		1,268,232		7.9		N/A		N/A
Chemical Bank	1,708,724		10.6		1,265,358		7.9		1,285,444		8.0
Common Equity Tier 1 Capital to Risk-Weighted Asset
Corporation	1,723,004		10.7		1,026,664		6.4		N/A		N/A
Chemical Bank	1,708,724		10.6		1,024,338		6.4		1,044,423		6.5
Leverage Ratio
Corporation	1,723,004		8.7		793,669		4.0		N/A		N/A
Chemical Bank	1,708,724		8.6		792,184		4.0		990,230		5.0