Regulatory Capital (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Risk weighted assets	$ 4,900,000,000	$ 4,640,000,000	$ 4,360,000,000
Chemical Financial Corporation [Member]
Total Capital to Risk-Weighted Assets:
Actual, Capital Amount	748,332,000	649,836,000	572,503,000
Minimum Required for Capital Adequacy Purposes, Capital Amount	391,911,000	371,465,000	348,442,000
Actual, Ratio	15.30%	14.00%	13.10%
Minimum Required for Capital Adequacy Purposes, Ratio	8.00%	8.00%	8.00%
Tier 1 Capital to Risk-Weighted Assets:
Actual, Capital Amount	686,892,000	591,535,000	517,716,000
Minimum Required for Capital Adequacy Purposes, Capital Amount	195,955,000	185,732,000	174,221,000
Actual, Ratio	14.00%	12.70%	11.90%
Minimum Required for Capital Adequacy Purposes, Ratio	4.00%	4.00%	4.00%
Leverage Ratio:
Actual, Capital Amount	686,892,000	591,535,000	517,716,000
Minimum Required for Capital Adequacy Purposes, Capital Amount	244,757,000	239,010,000	228,436,000
Actual, Ratio	11.20%	9.90%	9.10%
Minimum Required for Capital Adequacy Purposes, Ratio	4.00%	4.00%	4.00%
Chemical Bank [Member]
Total Capital to Risk-Weighted Assets:
Actual, Capital Amount	601,561,000	579,494,000	556,536,000
Minimum Required for Capital Adequacy Purposes, Capital Amount	391,305,000	370,881,000	347,865,000
Required to be Well Capitalized Under Prompt Corrective Action Regulations, Capital Amount	489,131,000	463,601,000	434,831,000
Actual, Ratio	12.30%	12.50%	12.80%
Minimum Required for Capital Adequacy Purposes, Ratio	8.00%	8.00%	8.00%
Required to be Well Capitalized Under Prompt Corrective Action Regulations, Ratio	10.00%	10.00%	10.00%
Tier 1 Capital to Risk-Weighted Assets:
Actual, Capital Amount	540,214,000	521,283,000	501,839,000
Minimum Required for Capital Adequacy Purposes, Capital Amount	195,653,000	185,440,000	173,932,000
Required to be Well Capitalized Under Prompt Corrective Action Regulations, Capital Amount	293,479,000	278,160,000	260,899,000
Actual, Ratio	11.00%	11.20%	11.50%
Minimum Required for Capital Adequacy Purposes, Ratio	4.00%	4.00%	4.00%
Required to be Well Capitalized Under Prompt Corrective Action Regulations, Ratio	6.00%	6.00%	6.00%
Leverage Ratio:
Actual, Capital Amount	540,214,000	521,283,000	501,839,000
Minimum Required for Capital Adequacy Purposes, Capital Amount	244,604,000	238,884,000	228,126,000
Required to be Well Capitalized Under Prompt Corrective Action Regulations, Capital Amount	$ 305,755,000	$ 298,605,000	$ 285,157,000
Actual, Ratio	8.80%	8.70%	8.80%
Minimum Required for Capital Adequacy Purposes, Ratio	4.00%	4.00%	4.00%
Required to be Well Capitalized Under Prompt Corrective Action Regulations, Ratio	5.00%	5.00%	5.00%

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The amount of total capital as defined in the regulations.

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The amount of Total Capital required to be categorized as well as capitalized under the regulatory framework for prompt corrective action.

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Total Capital divided by risk weighted assets as defined in the regulations.

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Amount of risk-weighted assets as calculated in accordance with U.S. Federal regulatory capital standards.

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Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital.

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Tier 1 Risk Based Capital as defined in the regulations.

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Tier 1 capital divided by risk weighted assets as defined by regulations.

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