Parent Company Only Financial Statements Statements of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]
Net Income	$ 62,121us-gaap_NetIncomeLoss	$ 56,808us-gaap_NetIncomeLoss	$ 51,008us-gaap_NetIncomeLoss
Net Cash Provided by (Used in) Operating Activities [Abstract]
Share-based compensation expense	2,931us-gaap_ShareBasedCompensation	2,854us-gaap_ShareBasedCompensation	1,865us-gaap_ShareBasedCompensation
Depreciation of premises and equipment	8,980us-gaap_DepreciationNonproduction	8,713us-gaap_DepreciationNonproduction	8,142us-gaap_DepreciationNonproduction
Net Cash Provided by Operating Activities	89,931	89,679	95,166
Net Cash Provided by (Used in) Investing Activities [Abstract]
Cash assumed in business combination	(14,260)us-gaap_CashAcquiredFromAcquisition	0us-gaap_CashAcquiredFromAcquisition	339,372us-gaap_CashAcquiredFromAcquisition
Purchase of investment securities available-for-sale	0	(304,264)	(191,689)
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities	165,749	154,959	268,848
Purchases of premises and equipment, net	(13,411)	(8,664)	(10,303)
Net Cash Provided by (Used in) Investing Activities	(478,755)	(648,475)	53,127
Net Cash Provided by (Used in) Financing Activities [Abstract]
Payments of Ordinary Dividends, Common Stock	(29,528)us-gaap_PaymentsOfDividendsCommonStock	(24,521)us-gaap_PaymentsOfDividendsCommonStock	(22,566)us-gaap_PaymentsOfDividendsCommonStock
Proceeds from issuance of common stock, net of issuance costs	76,175	53,925	0
Repayments of Subordinated Debt	10,310us-gaap_RepaymentsOfSubordinatedDebt	0us-gaap_RepaymentsOfSubordinatedDebt	0us-gaap_RepaymentsOfSubordinatedDebt
Proceeds from directors' stock purchase plan and exercise of stock options	1,242us-gaap_ProceedsFromStockPlans	806us-gaap_ProceedsFromStockPlans	260us-gaap_ProceedsFromStockPlans
Restricted Stock, Value, Shares Issued Net of Tax Withholdings	(701)	(379)	(248)
Net Cash Provided by Financing Activities	261,056	213,449	125,902
Net Increase (Decrease) in Cash and Cash Equivalents	(127,768)	(345,347)	274,195
Cash and Cash Equivalents at Beginning of Year	310,788	656,135	381,940
Cash and Cash Equivalents at End of Year	183,020	310,788	656,135
Chemical Financial Corporation [Member]
Condensed Financial Statements, Captions [Line Items]
Net Income	62,121	56,808	51,008
Net Cash Provided by (Used in) Operating Activities [Abstract]
Share-based compensation expense	2,931	2,854	1,865
Gain on sale of available-for-sale investment securities	0	(245)	0
Depreciation of premises and equipment	327	416	463
Equity in undistributed net income of subsidiary bank	(2,498)	(35,109)	(25,828)
Net increase in other assets	1,101	(711)	1,033
Net increase (decrease) in other liabilities	(2,519)	563	394
Net Cash Provided by Operating Activities	61,463	24,576	28,935
Net Cash Provided by (Used in) Investing Activities [Abstract]
Cash assumed in business combination	(117,853)	0	0
Purchase of investment securities available-for-sale	0	0	(4,755)
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities	0	5,000	0
Purchases of premises and equipment, net	(26)	(9)	(147)
Net Cash Provided by (Used in) Investing Activities	(117,879)	4,991	(4,902)
Net Cash Provided by (Used in) Financing Activities [Abstract]
Payments of Ordinary Dividends, Common Stock	(29,528)	(24,521)	(22,566)
Proceeds from issuance of common stock, net of issuance costs	76,175	53,925
Repayments of Subordinated Debt	(10,310)	0	0
Proceeds from directors' stock purchase plan and exercise of stock options	1,242	806	260
Restricted Stock, Value, Shares Issued Net of Tax Withholdings	(701)	(379)	(248)
Net Cash Provided by Financing Activities	36,878	29,831	(22,554)
Net Increase (Decrease) in Cash and Cash Equivalents	(19,538)	59,398	1,479
Cash and Cash Equivalents at Beginning of Year	65,358	5,960	4,481
Cash and Cash Equivalents at End of Year	$ 45,820	$ 65,358	$ 5,960

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This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

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The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business).

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.

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The expense recognized in the current period that allocates the cost of nonproduction tangible assets over their useful lives.

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The increase (decrease) during the reporting period in other assets used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current assets, other noncurrent assets, or a combination of other current and noncurrent assets.

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash inflow from the additional capital contribution to the entity.

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The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

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The cash inflow associated with the amount received from the stock plan during the period.

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The value of restricted shares issued as compensation, net of the value of shares for the payment of withholding taxes. This element is to be used only if shares are used in lieu of cash to satisfy all or a portion of withholding taxes.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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