10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

þ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the quarterly period ended March 31, 2015

¨ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the transition period from ____________ to ____________            

Commission File Number: 000-08185

CHEMICAL FINANCIAL CORPORATION

(Exact Name of Registrant as Specified in Its Charter)

Michigan	38-2022454
(State or Other Jurisdiction of Incorporation or Organization)	(I.R.S. Employer Identification No.)
235 E. Main Street Midland, Michigan	48640
(Address of Principal Executive Offices)	(Zip Code)

(989) 839-5350

(Registrant’s Telephone Number, Including Area Code)

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  þ    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Website, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  þ    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer	þ	Accelerated filer	¨
Non-accelerated filer	¨ (Do not check if a smaller reporting company)	Smaller reporting company	¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ¨    No  þ

The number of shares outstanding of the registrant’s Common Stock, $1 par value, as of April 17, 2015, was 33,711,700 shares.

INDEX

Chemical Financial Corporation

Form 10-Q

Index to Form 10-Q

	Page
Forward-Looking Statements	3
Part I. Financial Information	5
Item 1. Financial Statements	5
Consolidated Statements of Financial Position as of March 31, 2015 (unaudited), December 31, 2014 and March 31, 2014 (unaudited)	5
Consolidated Statements of Income for the Three Months Ended March 31, 2015 and 2014 (unaudited)	6
Consolidated Statements of Comprehensive Income for the Three Months Ended March 31, 2015 and 2014 (unaudited)	7
Consolidated Statements of Changes in Shareholders’ Equity for the Three Months Ended March 31, 2015 and 2014 (unaudited)	8
Consolidated Statements of Cash Flows for the Three Months Ended March 31, 2015 and 2014 (unaudited)	9
Notes to Consolidated Financial Statements (unaudited)	10
Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations	48
Item 3. Quantitative and Qualitative Disclosures About Market Risk	76
Item 4. Controls and Procedures	76
Part II. Other Information	77
Item 1A. Risk Factors	77
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds	77
Item 6. Exhibits	78
Signatures	79
Exhibit Index	80

2

Forward-Looking Statements

This report contains forward-looking statements that are based on management's beliefs, assumptions, current expectations, estimates and projections about the financial services industry, the economy and Chemical Financial Corporation (Corporation). Words and phrases such as "anticipates," "believes," "continue," "estimates," "expects," "forecasts," "intends," "is likely," "judgment," "look forward," "may," "opinion," "plans," "predicts," "probable," "projects," "should," "strategic," "trend," "will," and variations of such words and phrases or similar expressions are intended to identify such forward-looking statements. Such statements are based upon current beliefs and expectations and involve substantial risks and uncertainties which could cause actual results to differ materially from those expressed or implied by such forward-looking statements. All statements referencing future time periods are forward-looking.

Management's determination of the provision and allowance for loan losses; the carrying value of acquired loans, goodwill and mortgage servicing rights; the fair value of investment securities (including whether any impairment on any investment security is temporary or other-than-temporary and the amount of any impairment); and management's assumptions concerning pension and other postretirement benefit plans involve judgments that are inherently forward-looking. There can be no assurance that future loan losses will be limited to the amounts estimated. All of the information concerning interest rate sensitivity is forward-looking. The future effect of changes in the financial and credit markets and the national and regional economies on the banking industry, generally, and on the Corporation, specifically, are also inherently uncertain. These statements are not guarantees of future performance and involve certain risks, uncertainties and assumptions ("risk factors") that are difficult to predict with regard to timing, extent, likelihood and degree of occurrence. Therefore, actual results and outcomes may materially differ from what may be expressed or forecasted in such forward-looking statements. The Corporation undertakes no obligation to update, amend or clarify forward-looking statements, whether as a result of new information, future events or otherwise.

This report may contain forward-looking statements regarding the Corporation's outlook or expectations with respect to its recently completed acquisition of Monarch Community Bancorp, Inc. (Monarch) and its planned acquisition of Lake Michigan Financial Corporation (Lake Michigan), the expected costs to be incurred in connection with the acquisitions, Monarch's and Lake Michigan's future performance and consequences of their integration into the Corporation and the impact of the transactions on the Corporation’s future performance.

Risk factors relating to these transactions and the integration of Monarch and Lake Michigan into the Corporation after closing include, without limitation:

Completion of the Lake Michigan transaction is dependent on, among other things, receipt of shareholder approval, the timing of which cannot be predicted with precision at this point and which may not be received at all.

The impact of the completion of the Lake Michigan transaction on the Corporation's financial statements will be affected by the timing of the transaction.

The transactions may be more expensive to complete and the anticipated benefits, including anticipated cost savings and strategic gains, may be significantly harder or take longer to achieve than expected or may not be achieved in their entirety as a result of unexpected factors or events.

The integration of Monarch's and Lake Michigan's business and operations into the Corporation, which will include conversion of operating systems and procedures, may take longer than anticipated or be more costly than anticipated or have unanticipated adverse results relating to Monarch's, Lake Michigan's or the Corporation's existing businesses.

The Corporation's ability to achieve anticipated results from the transactions is dependent on the state of the economic and financial markets going forward. Specifically, the Corporation may incur more credit losses from Monarch's or Lake Michigan's loan portfolio than expected and deposit attrition may be greater than expected.

In addition, risk factors include, but are not limited to, the risk factors described in Item 1A of the Corporation’s Annual Report on Form 10-K for the year ended December 31, 2014. These and other factors are representative of the risk factors that may emerge and could cause a difference between an ultimate actual outcome and a preceding forward-looking statement.

No Offer or Solicitation

This communication is not intended to and does not constitute an offer to sell or the solicitation of an offer to subscribe for or buy or an invitation to purchase or subscribe for any securities or the solicitation of any vote or approval in any jurisdiction pursuant to any merger agreement associated with the Lake Michigan transaction or otherwise, nor shall there be any sale, issuance or transfer of securities in any jurisdiction in contravention of applicable law. No offer of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the Securities Act of 1933, as amended.

3

Additional Information about the Lake Michigan Transaction

Chemical filed a registration statement on Form S-4 with the Securities and Exchange Commission (SEC) to register the securities that the Lake Michigan shareholders will receive if the transaction is consummated. The registration statement contains a prospectus, a proxy statement for the meeting at which the Lake Michigan shareholders will consider approval of the transaction and other relevant documents concerning the transaction. Investors are urged to read the registration statement, the prospectus and proxy statement, and any other relevant documents when they become available because they will contain important information about Chemical, Lake Michigan and the transaction. Investors will be able to obtain the documents free of charge at the SEC's website, www.sec.gov, by contacting Chemical Financial Corporation, 235 East Main Street, P.O. Box 569, Midland, MI 48640-0569, Attention: Ms. Lori A. Gwizdala, Investor Relations, telephone 800-867-9757 or by contacting Lake Michigan Financial Corporation, 150 Central Avenue, Holland, Michigan 49423, Attention: Mr. James Luyk, Investor Relations, telephone 616-546-4078. INVESTORS SHOULD READ THE PROSPECTUS AND PROXY STATEMENT AND OTHER DOCUMENTS FILED WITH THE SEC CAREFULLY BEFORE MAKING A DECISION CONCERNING THE TRANSACTION.

Lake Michigan and its respective directors, executive officers, and certain other members of management and employees, may be soliciting proxies from Lake Michigan shareholders in favor of the transaction. Information regarding the persons who may, under the rules of the SEC, be considered participants in the solicitation of Lake Michigan shareholders in connection with the proposed transaction is set forth in the prospectus and proxy statement filed with the SEC. Free copies of this document may be obtained as described above.

4

Part I. Financial Information

Item 1.    Financial Statements

Chemical Financial Corporation

Consolidated Statements of Financial Position

	March 31, 2015			December 31, 2014			March 31, 2014
	(Unaudited)						(Unaudited)
	(In thousands, except share data)
Assets
Cash and cash equivalents:
Cash and cash due from banks	$	121,796		$	144,892		$	122,288
Interest-bearing deposits with the Federal Reserve Bank and other banks	272,142			38,128			260,097
Total cash and cash equivalents	393,938			183,020			382,385
Investment securities:
Available-for-sale, at fair value	680,644			748,864			657,818
Held-to-maturity (fair value - $380,176 at March 31, 2015, $315,740 at December 31, 2014 and $272,407 at March 31, 2014)	381,450			316,413			278,099
Total investment securities	1,062,094			1,065,277			935,917
Loans held-for-sale, at fair value	9,675			9,128			3,814
Loans	5,702,874			5,688,230			4,753,289
Allowance for loan losses	(75,256		)	(75,683		)	(78,473		)
Net loans	5,627,618			5,612,547			4,674,816
Premises and equipment (net of accumulated depreciation of $111,270 at March 31, 2015, $108,826 at December 31, 2014 and $102,163 at March 31, 2014)	96,486			97,496			74,779
Goodwill	180,128			180,128			120,164
Other intangible assets	31,655			33,080			12,872
Interest receivable and other assets	150,041			141,467			133,581
Total Assets	$	7,551,635		$	7,322,143		$	6,338,328
Liabilities and Shareholders’ Equity
Deposits:
Noninterest-bearing	$	1,614,319		$	1,591,661		$	1,219,081
Interest-bearing	4,706,034			4,487,310			4,012,212
Total deposits	6,320,353			6,078,971			5,231,293
Interest payable and other liabilities	48,545			56,572			40,209
Short-term borrowings	372,236			389,467			361,231
Total liabilities	6,741,134			6,525,010			5,632,733
Shareholders’ equity:
Preferred stock, no par value:
Authorized – 200,000 shares, none issued	—			—			—
Common stock, $1 par value per share:
Authorized — 45,000,000 shares
Issued and outstanding — 32,847,063 shares at March 31, 2015, 32,774,420 shares at December 31, 2014 and 29,865,841 shares at March 31, 2014	32,847			32,774			29,866
Additional paid-in capital	565,851			565,166			489,045
Retained earnings	241,582			231,646			205,985
Accumulated other comprehensive loss	(29,779		)	(32,453		)	(19,301		)
Total shareholders’ equity	810,501			797,133			705,595
Total Liabilities and Shareholders’ Equity	$	7,551,635		$	7,322,143		$	6,338,328

See accompanying notes to consolidated financial statements (unaudited).

5

Chemical Financial Corporation

Consolidated Statements of Income (Unaudited)

	Three Months Ended
	March 31,
	2015		2014
	(In thousands, except per share data)
Interest Income
Interest and fees on loans	$	58,097	$	49,195
Interest on investment securities:
Taxable	2,307		2,383
Tax-exempt	1,906		1,704
Dividends on nonmarketable equity securities	198		238
Interest on deposits with the Federal Reserve Bank and other banks	122		125
Total interest income	62,630		53,645
Interest Expense
Interest on deposits	3,352		3,745
Interest on short-term borrowings	98		121
Total interest expense	3,450		3,866
Net Interest Income	59,180		49,779
Provision for loan losses	1,500		1,600
Net interest income after provision for loan losses	57,680		48,179
Noninterest Income
Service charges and fees on deposit accounts	5,916		4,930
Wealth management revenue	5,071		3,631
Other charges and fees for customer services	5,990		4,194
Mortgage banking revenue	1,403		794
Gain on sale of investment securities	579		—
Other	316		167
Total noninterest income	19,275		13,716
Operating Expenses
Salaries, wages and employee benefits	29,268		24,184
Occupancy	4,426		4,374
Equipment and software	4,738		3,461
Other	12,588		10,163
Total operating expenses	51,020		42,182
Income before income taxes	25,935		19,713
Federal income tax expense	8,100		5,900
Net Income	$	17,835	$	13,813
Net Income Per Common Share:
Basic	$	0.54	$	0.46
Diluted	0.54		0.46
Cash Dividends Declared Per Common Share	0.24		0.23

See accompanying notes to consolidated financial statements (unaudited).

6

Chemical Financial Corporation

Consolidated Statements of Comprehensive Income (Unaudited)

	Three Months Ended
	March 31,
	2015			2014
	(In thousands)
Net income	$	17,835		$	13,813
Other comprehensive income (loss), net of tax:
Net unrealized gains on investment securities available-for-sale, net of tax expense of $1,262 and $857 for the three months ended March 31, 2015 and 2014, respectively	2,344			1,593
Reclassification adjustment for realized gain on sale of investment securities available-for-sale included in net income, net of tax expense of $203 for the three months ended March 31, 2015	(376		)	—
Adjustment for pension and other postretirement benefits, net of tax expense (benefit) of $381 and $(201) for the three months ended March 31, 2015 and 2014, respectively	706			(374		)
Total other comprehensive income (loss), net of tax	2,674			1,219
Comprehensive income	$	20,509		$	15,032

See accompanying notes to consolidated financial statements (unaudited).

7

Chemical Financial Corporation

Consolidated Statements of Changes in Shareholders’ Equity (Unaudited)

	Common Stock		Additional Paid-in Capital			Retained Earnings			Accumulated Other Comprehensive Loss			Total
	(In thousands, except per share data)
Balances at December 31, 2013	$	29,790	$	488,177		$	199,053		$	(20,520	)	$	696,500
Comprehensive income						13,813			1,219			15,032
Cash dividends declared and paid of $0.23 per share						(6,881		)				(6,881		)
Shares issued – stock options	27		530									557
Shares issued – directors’ stock plans	12		298									310
Shares issued – restricted stock units	36		(513		)							(477		)
Share-based compensation	1		553									554
Balances at March 31, 2014	$	29,866	$	489,045		$	205,985		$	(19,301	)	$	705,595
Balances at December 31, 2014	$	32,774	$	565,166		$	231,646		$	(32,453	)	$	797,133
Comprehensive income						17,835			2,674			20,509
Cash dividends declared and paid of $0.24 per share						(7,899		)				(7,899		)
Shares issued – stock options	13		118									131
Shares issued – directors’ stock plans	11		305									316
Shares issued – restricted stock units	48		(492		)							(444		)
Share-based compensation	1		754									755
Balances at March 31, 2015	$	32,847	$	565,851		$	241,582		$	(29,779	)	$	810,501

See accompanying notes to consolidated financial statements (unaudited).

8

Chemical Financial Corporation

Consolidated Statements of Cash Flows (Unaudited)

	Three Months Ended
	March 31,
	2015			2014
	(In thousands)
Operating Activities
Net income	$	17,835		$	13,813
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	1,500			1,600
Gains on sales of loans	(1,589		)	(647		)
Proceeds from sales of loans	54,280			22,080
Loans originated for sale	(53,238		)	(20,028		)
Net gains from sales/writedowns of other real estate and repossessed assets	(570		)	(379		)
Depreciation of premises and equipment	2,479			2,119
Amortization of intangible assets	1,825			695
Gain on sale of investment securities	(579		)	—
Net amortization of premiums and discounts on investment securities	1,373			1,093
Share-based compensation expense	755			554
Net increase in interest receivable and other assets	(9,562		)	(1,319		)
Net increase (decrease) in interest payable and other liabilities	(7,038		)	1,239
Net cash provided by operating activities	7,471			20,820
Investing Activities
Investment securities – available-for-sale:
Proceeds from sales	13,172			—
Proceeds from maturities, calls and principal reductions	57,449			28,426
Investment securities – held-to-maturity:
Proceeds from maturities, calls and principal reductions	7,542			31,798
Purchases	(72,748		)	(36,309		)
Net increase in loans	(20,233		)	(109,965		)
Proceeds from sales of other real estate and repossessed assets	3,693			2,197
Purchases of premises and equipment, net of disposals	(1,469		)	(1,590		)
Net cash used in investing activities	(12,594		)	(85,443		)
Financing Activities
Net increase in interest- and noninterest-bearing demand deposits and savings accounts	247,244			78,246
Net increase (decrease) in time deposits	(5,862		)	30,662
Net increase (decrease) in short-term borrowings	(17,231		)	33,803
Cash dividends paid	(7,899		)	(6,881		)
Proceeds from directors’ stock plans and exercise of stock options, net of shares withheld	447			867
Cash paid for payroll taxes upon conversion of share-based awards	(658		)	(477		)
Net cash provided by financing activities	216,041			136,220
Net increase in cash and cash equivalents	210,918			71,597
Cash and cash equivalents at beginning of period	183,020			310,788
Cash and cash equivalents at end of period	$	393,938		$	382,385
Supplemental Disclosure of Cash Flow Information:
Interest paid	$	3,426		$	3,858
Loans transferred to other real estate and repossessed assets	3,662			2,098
Federal income taxes paid	9,800			—

See accompanying notes to consolidated financial statements (unaudited).

9

Chemical Financial Corporation

Notes to Consolidated Financial Statements (Unaudited)

March 31, 2015

Note 1: Significant Accounting Policies

Nature of Operations

Chemical Financial Corporation (Corporation) operates in a single operating segment — commercial banking. The Corporation is a financial holding company, headquartered in Midland, Michigan, that operated through one commercial bank, Chemical Bank, as of March 31, 2015. Monarch Community Bank was acquired in the April 1, 2015 acquisition of Monarch Community Bancorp, Inc. (Monarch). The Corporation intends to consolidate Monarch Community Bank with and into Chemical Bank during the second quarter of 2015. Chemical Bank operates within the State of Michigan as a state-chartered commercial bank. Chemical Bank operates through an internal organizational structure of four regional banking units and offers a full range of traditional banking and fiduciary products and services to the residents and business customers in the bank’s geographical market areas. The products and services offered by the regional banking units, through branch banking offices, are generally consistent throughout the Corporation, as is the pricing of those products and services. The marketing of products and services throughout the Corporation’s regional banking units is generally uniform, as many of the markets served by the regional banking units overlap. The distribution of products and services is uniform throughout the Corporation’s regional banking units and is achieved primarily through retail branch banking offices, automated teller machines and electronically accessed banking products.

The Corporation’s primary sources of revenue are interest from its loan products and investment securities, service charges and fees from customer deposit accounts and wealth management revenue.

Basis of Presentation

The accompanying unaudited consolidated financial statements of the Corporation and its subsidiaries have been prepared in accordance with U.S. generally accepted accounting principles (GAAP) for interim financial information and the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, the interim consolidated financial statements do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with the Corporation’s consolidated financial statements and footnotes thereto included in the Corporation’s Annual Report on Form 10-K for the year ended December 31, 2014. In the opinion of management, the accompanying unaudited interim consolidated financial statements contain all adjustments believed necessary to present fairly the financial condition and results of operations of the Corporation for the periods presented. Operating results for the three months ended March 31, 2015 are not necessarily indicative of the results that may be expected for the year ending December 31, 2015.

Use of Estimates

Management makes estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying footnotes. Estimates that are particularly susceptible to significant change include the determination of the allowance for loan losses, expected cash flows from acquired loans, fair value amounts related to business combinations, pension expense, income taxes, goodwill impairment and those assets that require fair value measurement. Actual results could differ from these estimates.

Business Combinations

Pursuant to the guidance of ASC Topic 805, Business Combinations (ASC 805), the Corporation recognizes assets acquired, including identified intangible assets, and the liabilities assumed in acquisitions at their fair values as of the acquisition date, with the acquisition-related transaction and restructuring costs expensed in the period incurred.

ASC 805 affords a measurement period beyond the acquisition date that allows the Corporation the opportunity to finalize the acquisition accounting in the event that new information is identified that existed as of the acquisition date but was not known by the Corporation at that time. The Corporation anticipates that measurement period adjustments may arise from adjustments to the fair values of assets and liabilities recognized at the acquisition date for Northwestern Bancorp, Inc. (Northwestern) as additional information is obtained, such as appraisals of collateral securing loans and other borrower information. In the event that a measurement period adjustment is identified, the Corporation will recognize the adjustment as part of its acquisition accounting, which may result in an adjustment to goodwill being recorded.

See Note 2 for further information regarding the Corporation's completed and pending acquisition transactions.

10

Chemical Financial Corporation

Notes to Consolidated Financial Statements (Unaudited)

March 31, 2015

Originated Loans

Originated loans include all of the Corporation's portfolio loans, excluding loans acquired on October 31, 2014 in the acquisition of Northwestern and on April 30, 2010 in the acquisition of O.A.K. Financial Corporation (OAK). Originated loans also include loans acquired as part of the Corporation's branch acquisition on December 7, 2012, as these loans were performing and were considered high-quality loans in accordance with the Corporation's credit underwriting standards at that date. Originated loans are stated at their principal amount outstanding, net of unearned income, charge-offs and unamortized deferred fees and costs. Loan interest income is recognized on the accrual basis. Deferred loan fees and costs are amortized over the loan term based on the level-yield method. Net loan commitment fees are deferred and amortized into fee income on a straight-line basis over the commitment period.

The past due status of a loan is based on the loan’s contractual terms. A loan is placed in nonaccrual status (accrual of interest is discontinued) when principal or interest is past due 90 days or more (except for a loan that is secured by residential real estate, which is transferred to nonaccrual status at 120 days past due), unless the loan is both well-secured and in the process of collection, or earlier when, in the opinion of management, there is sufficient reason to doubt the collectibility of principal or interest. Interest previously accrued, but not collected, is reversed and charged against interest income at the time the loan is placed in nonaccrual status. Subsequent receipts of interest while a loan is in nonaccrual status are recorded as a reduction of principal. Loans are returned to accrual status when principal and interest payments are brought current, payments have been received consistently for a period of time (generally six months) and collectibility is no longer in doubt.

Loans Acquired in a Business Combination

Loans acquired in a business combination (acquired loans) consist of loans acquired on October 31, 2014 in the acquisition of Northwestern and on April 30, 2010 in the acquisition of OAK. Acquired loans were recorded at fair value at the date of acquisition, without a carryover of the associated allowance for loan losses related to these loans, through a fair value discount that was, in part, attributable to deterioration in credit quality. The estimate of expected credit losses was determined based on due diligence performed by executive and senior officers of the Corporation, with assistance from third-party consultants. The fair value discount was recorded as a reduction of the acquired loans’ outstanding principal balances in the consolidated statement of financial position at the acquisition date.

The Corporation accounts for acquired loans, which are recorded at fair value at acquisition, in accordance with Accounting Standards Codification (ASC) Topic 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality (ASC 310-30). ASC 310-30 allows investors to aggregate loans acquired into loan pools that have common risk characteristics and thereby use a composite interest rate and expectation of cash flows expected to be collected for the loan pools. Under the provisions of ASC 310-30, the Corporation aggregated acquired loans into 4 pools in the acquisition of Northwestern and 14 pools in the acquisition of OAK based upon common risk characteristics, including types of loans, commercial type loans with similar risk grades and whether loans were performing or nonperforming. A pool is considered a single unit of accounting for the purposes of applying the guidance prescribed in ASC 310-30. A loan will be removed from a pool of acquired loans only if the loan is sold, foreclosed, paid off or written off, and will be removed from the pool at the carrying value. If an individual loan is removed from a pool of loans, the difference between its relative carrying amount and the cash, fair value of the collateral, or other assets received would not affect the effective yield used to recognize the accretable difference on the remaining pool. The Corporation estimated the cash flows expected to be collected over the life of the pools of loans at acquisition and estimates expected cash flows quarterly thereafter, based on a set of assumptions including expectations as to default rates, prepayment rates and loss severities. The Corporation must make numerous assumptions, interpretations and judgments using internal and third-party credit quality information to determine whether it is probable that the Corporation will be able to collect all contractually required payments. This is a point in time assessment and inherently subjective due to the nature of the available information and judgment involved.

The calculation of the fair value of the acquired loan pools entails estimating the amount and timing of cash flows attributable to both principal and interest expected to be collected on such loan pools and then discounting those cash flows at market interest rates. The excess of a loan pool's expected cash flows at the acquisition date over its estimated fair value is referred to as the "accretable yield," which is recognized into interest income over the estimated remaining life of the loan pool on a level-yield basis. The difference between a loan pool's contractually required principal and interest payments at the acquisition date and the cash flows expected to be collected at the acquisition date is referred to as the "nonaccretable difference," which includes an estimate of future credit losses expected to be incurred over the estimated life of the loan pool and interest payments that are not expected to be collected. Decreases to the expected cash flows in each loan pool in subsequent periods will require the Corporation to record a provision for loan losses. Improvements in expected cash flows in each loan pool in subsequent periods will result in reversing a portion of the nonaccretable difference, which is then classified as part of the accretable yield and subsequently recognized into interest income over the estimated remaining life of the loan pool.

11

Chemical Financial Corporation

Notes to Consolidated Financial Statements (Unaudited)

March 31, 2015

Loans Modified Under Troubled Debt Restructurings

Loans modified under troubled debt restructurings (TDRs) involve granting a concession to a borrower who is experiencing financial difficulty. Concessions generally include modifications to original loan terms, including changes to a loan’s payment schedule or interest rate, which generally would not otherwise be considered. The Corporation’s TDRs include performing and nonperforming TDRs, which consist of originated loans that continue to accrue interest at the loan's original interest rate as the Corporation expects to collect the remaining principal and interest on the loan, and nonaccrual TDRs, which include originated loans that are in a nonaccrual status and are no longer accruing interest, as the Corporation does not expect to collect the full amount of principal and interest owed from the borrower on these loans. At the time of modification (except for loans on nonaccrual status), a TDR is reported as a nonperforming TDR until a six-month payment history of principal and interest payments, in accordance with the terms of the loan modification, is sustained, at which time the Corporation moves the loan to a performing status (performing TDR). If the Corporation does not expect to collect all principal and interest on the loan, the modified loan is classified as a nonaccrual TDR. All TDRs are accounted for as impaired loans and are included in the Corporation’s analysis of the allowance for loan losses. A TDR that has been renewed by a borrower who is no longer experiencing financial difficulty and which yields a market rate of interest at the time of a refinancing is no longer reported as a TDR.

Loans in the Corporation’s commercial loan portfolio (comprised of commercial, commercial real estate, real estate construction and land development loans) that meet the definition of a TDR generally consist of loans where the Corporation has allowed borrowers to defer scheduled principal payments and make interest-only payments for a specified period of time at the stated interest rate of the original loan agreement or reduced payments due to a moderate extension of the loan’s contractual term. If the Corporation does not expect to collect all principal and interest on the loan, the modified loan is classified as a nonaccrual TDR. If the Corporation does not expect to incur a loss on the loan based on its assessment of the borrowers’ expected cash flows, as the pre- and post-modification effective yields are approximately the same, the loan is classified as a nonperforming TDR until a six-month payment history is sustained, at which time the loan is classified as a performing TDR. Since no loss is expected to be incurred on these loans, no additional provision for loan losses has been recognized related to these loans, and these loans accrue interest at their contractual interest rate. These loans are individually evaluated for impairment and transferred to nonaccrual status if they become 90 days past due as to principal or interest payments or if it is probable that any remaining principal and interest payments due on the loan will not be collected in accordance with the modified terms of the loan.

Loans in the Corporation’s consumer loan portfolio (comprised of residential mortgage, consumer installment and home equity loans) that meet the definition of a performing or nonperforming TDR generally consist of residential mortgage loans that include a concession that reduces a borrower’s monthly payments by decreasing the interest rate charged on the loan for a specified period of time (generally 24 months) under a formal modification agreement. The Corporation recognizes an additional provision for loan losses related to impairment on these loans on an individual basis based on the present value of expected future cash flows discounted at the loan’s original effective interest rate. These loans continue to accrue interest at their effective interest rate, which consists of contractual interest under the terms of the modification agreement in addition to an adjustment for the accretion of computed impairment. These loans are moved to nonaccrual status if they become 90 days past due as to principal or interest payments, or sooner if conditions warrant.

Impaired Loans

A loan is defined to be impaired when it is probable that payment of principal and interest will not be paid in accordance with the original contractual terms of the loan agreement. Impaired loans include nonaccrual loans (including nonaccrual TDRs), performing and nonperforming TDRs and acquired loans that were not performing in accordance with original contractual terms. Impaired loans are accounted for at the lower of the present value of expected cash flows discounted at the loan's original effective interest rate or the estimated fair value of the collateral, if the loan is collateral dependent. When the present value of expected cash flows or the fair value of collateral of an impaired loan in the originated loan portfolio is less than the amount of unpaid principal outstanding on the loan, the principal balance of the loan is reduced to its carrying value through either an allocation of the allowance for loan losses or a partial charge-off of the loan balance.

Nonperforming Loans

Nonperforming loans are comprised of loans for which the accrual of interest has been discontinued (nonaccrual loans, including nonaccrual TDRs), accruing originated loans contractually past due 90 days or more as to interest or principal payments and nonperforming TDRs.

Acquired loans that were classified as nonperforming loans prior to being acquired and acquired loans that are not performing in accordance with contractual terms subsequent to acquisition are not classified as nonperforming loans subsequent to acquisition because the loans are recorded in pools at net realizable value based on the principal and interest the Corporation expects to collect on such loans.

12

Chemical Financial Corporation

Notes to Consolidated Financial Statements (Unaudited)

March 31, 2015

Allowance for Loan Losses

The allowance for loan losses (allowance) is presented as a reserve against loans. The allowance represents management’s assessment of probable loan losses inherent in the Corporation’s loan portfolio.

Management’s evaluation of the adequacy of the allowance is based on a continuing review of the loan portfolio, actual loan loss experience, the underlying value of the collateral, risk characteristics of the loan portfolio, the level and composition of nonperforming loans, the financial condition of the borrowers, the balance of the loan portfolio, loan growth, economic conditions, employment levels in the Corporation’s local markets, and special factors affecting specific business sectors. The Corporation maintains formal policies and procedures to monitor and control credit risk. Management evaluates the allowance on a quarterly basis in an effort to ensure the level is appropriate to absorb probable losses inherent in the loan portfolio.

The allowance provides for probable losses that have been identified with specific customer relationships and for probable losses believed to be incurred in the remainder of the originated loan portfolio, but that have not been specifically identified. The Corporation utilizes its own loss experience to estimate inherent losses on loans. Internal risk ratings are assigned to each loan in the commercial loan portfolio (commercial, commercial real estate, real estate construction and land development loans) at the time of origination and are subject to subsequent periodic reviews by senior management. The Corporation performs a detailed credit quality review quarterly on all loans greater than $0.25 million that have deteriorated below certain levels of credit risk, and may allocate a specific portion of the allowance to such loans based upon this review. A portion of the allowance is allocated to the remaining loans by applying projected loss ratios, based on numerous factors. Projected loss ratios incorporate factors such as charge-off experience, trends with respect to adversely risk-rated loans in the commercial loan portfolio, trends with respect to past due and nonaccrual loans, changes in economic conditions and trends, changes in the value of underlying collateral and other credit risk factors. This evaluation involves a high degree of uncertainty.

In determining the allowance and the related provision for loan losses, the Corporation considers four principal elements: (i) valuation allowances based upon probable losses identified during the review of impaired loans in the commercial loan portfolio, (ii) reserves established for adversely-rated loans in the commercial loan portfolio and nonaccrual residential mortgage, consumer installment and home equity loans based on loan loss experience of other adversely-rated loans, (iii) reserves, by loan classes, on all other loans based principally on a five-year historical loan loss experience, with higher weighting placed on the most recent years, loan loss trends giving consideration to estimated loss emergence periods and (iv) an unallocated allowance based on the imprecision in the overall allowance methodology for loans collectively evaluated for impairment.

Although the Corporation allocates portions of the allowance to specific loans and loan types, the entire allowance attributable to originated loans is available for any loan losses that occur in the originated portfolio. Loans that are deemed not collectible are charged off and reduce the allowance. The provision for loan losses and recoveries on loans previously charged off increase the allowance. Collection efforts may continue and recoveries may occur after a loan is charged off.

Acquired loans are aggregated into pools based upon common risk characteristics. An allowance may be recorded related to an acquired loan pool if it experiences a decrease in expected cash flows, as compared to those projected at the acquisition date. On a quarterly basis, the expected future cash flow of each pool is estimated based on various factors, including changes in property values of collateral dependent loans, default rates, loss severities and prepayment speeds. Decreases in estimates of expected cash flows within a pool generally result in a charge to the provision for loan losses and a corresponding increase in the allowance allocated to acquired loans for the particular pool. Increases in estimates of expected cash flows within a pool generally result in a reduction in the allowance allocated to acquired loans for the particular pool, if applicable, and then an adjustment to the accretable yield for the pool, which will increase amounts recognized in interest income in subsequent periods.

Various regulatory agencies, as an integral part of their examination process, periodically review the allowance. Such agencies may require additions to the allowance, based on their judgment, reflecting information available to them at the time of their examinations.

Fair Value Measurements

Fair value for assets and liabilities measured at fair value on a recurring or nonrecurring basis refers to the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants in the market in which the reporting entity transacts such sales or transfers based on the assumptions market participants would use when pricing an asset or liability. Assumptions are developed based on prioritizing information within a fair value hierarchy that gives the highest priority to quoted prices in active markets and the lowest priority to unobservable data, such as the reporting entity’s own data.

The Corporation may choose to measure eligible items at fair value at specified election dates. Unrealized gains and losses on items for which the fair value measurement option has been elected are reported in earnings at each subsequent reporting date.

13

Chemical Financial Corporation

Notes to Consolidated Financial Statements (Unaudited)

March 31, 2015

The fair value option (i) may be applied instrument by instrument, with certain exceptions, allowing the Corporation to record identical financial assets and liabilities at fair value or by another measurement basis permitted under GAAP, (ii) is irrevocable (unless a new election date occurs) and (iii) is applied only to entire instruments and not to portions of instruments. At March 31, 2015, December 31, 2014 and March 31, 2014, the Corporation had elected the fair value option on all of its residential mortgage loans held-for-sale. The Corporation has not elected the fair value option for any other financial assets or liabilities.

Share-Based Compensation

The Corporation grants stock options, stock awards, restricted stock performance units and restricted stock service-based units to certain executive and senior management employees. The Corporation accounts for share-based compensation expense using the modified-prospective transition method. Under that method, compensation expense is recognized for stock options based on the estimated grant date fair value as computed using the Black-Scholes option pricing model and the probability of issuance. The Corporation accounts for stock awards based on the closing stock price of the Corporation's common stock on the date of the award. The fair values of both stock options and stock awards are recognized as compensation expense on a straight-line basis over the requisite service period. The Corporation accounts for restricted stock performance units based on the closing stock price of the Corporation's common stock on the date of grant, discounted by the present value of estimated future dividends to be declared over the requisite performance or service period. The fair value of restricted stock performance units is recognized as compensation expense over the expected requisite performance period, or requisite service period for awards with multiple performance and service conditions. The Corporation accounts for restricted stock service-based units based on the closing stock price of the Corporation's common stock on the date of grant, as these awards accrue dividend equivalents equal to the amount of any cash dividends that would have been payable to a shareholder owning the number of shares of the Corporation's common stock represented by the restricted stock service-based units. The fair value of the restricted stock service-based units is recognized as compensation expense over the requisite service period.

Cash flows realized from the tax benefits of exercised stock option awards that result from actual tax deductions that are in excess of the recorded tax benefits related to the compensation expense recognized for those options (excess tax benefits) are classified as financing activities on the consolidated statements of cash flows.

Income and Other Taxes

The Corporation is subject to the income and other tax laws of the United States, the State of Michigan and other states where nexus has been created. These laws are complex and are subject to different interpretations by the taxpayer and the various taxing authorities. In determining the provision for income and other taxes, management must make judgments and estimates about the application of these inherently complex laws, related regulations and case law. In the process of preparing the Corporation’s tax returns, management attempts to make reasonable interpretations of enacted tax laws. These interpretations are subject to challenge by the tax authorities upon audit or to reinterpretation based on management’s ongoing assessment of facts and evolving case law.

On a quarterly basis, management assesses the reasonableness of its effective federal tax rate based upon its estimate of taxable income and the applicable taxes expected for the full year. Deferred tax assets and liabilities are reassessed on a quarterly basis, including the need for a valuation allowance for deferred tax assets.

Uncertain income tax positions are evaluated to determine whether it is more-likely-than-not that a tax position will be sustained upon examination based on the technical merits of the tax position. If a tax position is more-likely-than-not to be sustained, a tax benefit is recognized for the amount that is greater than 50% likely to be realized. Reserves for contingent income tax liabilities attributable to unrecognized tax benefits associated with uncertain tax positions are reviewed quarterly for adequacy based upon developments in tax law and the status of audits or examinations. The Corporation had no contingent income tax liabilities recorded at March 31, 2015, December 31, 2014 or March 31, 2014. The tax periods open to examination by the Internal Revenue Service include the calendar years ended December 31, 2014, 2013, 2012 and 2011.

Investments in Qualified Affordable Housing Projects

The Corporation invests in qualified affordable housing projects solely for the purpose of obtaining tax credits and other tax benefits. Accordingly, the Corporation believes that amortizing its investments in qualified affordable housing projects as a component of income tax expense rather than as a component of operating expenses better reflects the nature and intent of these investments. The Corporation recognized additional income tax expense attributable to the amortization of investments in qualified affordable housing projects of $0.1 million during each of the three months ended March 31, 2015 and 2014. The Corporation's remaining investment in qualified affordable housing projects totaled $4.8 million at March 31, 2015, $4.9 million at December 31, 2014 and$3.2 million atMarch 31, 2014.

14

Chemical Financial Corporation

Notes to Consolidated Financial Statements (Unaudited)

March 31, 2015

Shareholders’ Equity

Common Stock Repurchase Programs

From time to time, the board of directors of the Corporation approves common stock repurchase programs allowing management to repurchase shares of the Corporation’s common stock in the open market. The repurchased shares are available for later reissuance in connection with potential future stock dividends, the Corporation’s dividend reinvestment plan, employee benefit plans and other general corporate purposes. Under these programs, the timing and actual number of shares subject to repurchase are at the discretion of management and are contingent on a number of factors, including the projected parent company cash flow requirements and the Corporation’s market price per share.

In January 2008, the board of directors of the Corporation authorized the repurchase of up to 500,000 shares of the Corporation’s common stock under a stock repurchase program. In November 2011, the board of directors of the Corporation reaffirmed the stock buy-back authorization with the qualification that the shares may only be repurchased if the share price is below the tangible book value per share of the Corporation’s common stock at the time of the repurchase. Since the January 2008 authorization, no shares have been repurchased. At March 31, 2015, there were 500,000 remaining shares available for repurchase under the Corporation’s stock repurchase program.

Underwritten Public Offerings of Common Stock

On June 24, 2014, the Corporation issued and sold 2,500,000 shares of common stock at a public offering price of $28.00 per share. An additional 375,000 shares were issued and sold on June 30, 2014 upon the exercise in full of the underwriters' over-allotment option. The net proceeds from the issuance and sale of the common stock of this $80.5 million offering, after deducting the underwriting discount and issuance-related expenses, totaled $76.2 million.

On September 18, 2013, the Corporation issued and sold 2,213,750 shares of common stock, including 288,750 shares of common stock that were issued and sold upon the exercise in full of the underwriters' over-allotment option, at a public offering price of $26.00 per share. The net proceeds from the issuance and sale of the common stock, after deducting the underwriting discount and issuance-related expenses, totaled $53.9 million.

Shelf Registration

On June 12, 2014, the Corporation filed an automatic shelf registration statement on Form S-3 with the Securities and Exchange Commission (SEC) for an indeterminate amount of securities, which became immediately effective. The shelf registration statement provides the Corporation with the ability to raise capital, subject to SEC rules and limitations, if the board of directors of the Corporation decides to do so.

Preferred Stock

On April 20, 2009, the shareholders of the Corporation authorized the board of directors of the Corporation to issue up to 200,000 shares of preferred stock in connection with either an acquisition by the Corporation of an entity that has shares of preferred stock issued and outstanding pursuant to any program established by the United States government or participation by the Corporation in any program established by the United States government. On April 20, 2015, the shareholders of the Corporation approved an amendment to the restated articles of incorporation which eliminates and replaces the previous class of 200,000 shares of preferred stock with a new class of 2,000,000 shares of preferred stock. At March 31, 2015, no shares of preferred stock were issued and outstanding.

Common Stock

On April 20, 2015, the shareholders of the Corporation approved an amendment to the restated articles of incorporation to increase the number of authorized shares of common stock from 45,000,000 to 60,000,000.

Legal Matters

The Corporation and Chemical Bank are subject to certain legal actions arising in the ordinary course of business. In the opinion of management, after consultation with legal counsel, the ultimate disposition of these matters is not expected to have a material adverse effect on the consolidated financial condition or results of operations of the Corporation.

15

Chemical Financial Corporation

Notes to Consolidated Financial Statements (Unaudited)

March 31, 2015

Adopted Accounting Pronouncements

In-Substance Foreclosures

In January 2014, the FASB issued ASU 2014-04, Receivables—Troubled Debt Restructurings by Creditors (Subtopic 310-40): Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure, a consensus of the FASB Emerging Issues Task Force (ASU 2014-04). ASU 2014-04 clarifies that an in-substance foreclosure occurs, and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either (i) the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure or (ii) the borrower conveying all interest in the residential real estate property to the creditor to satisfy the loan through completion of a deed in lieu of foreclosure or similar legal agreement. ASU 2014-04 also requires disclosure of both the amount of foreclosed residential real estate property held by the creditor and the recorded investment in loans collateralized by residential real estate property that are in the process of foreclosure. ASU 2014-04 is effective for public companies for interim and annual periods beginning after December 15, 2014, with early adoption permitted. Once adopted, an entity can elect either (i) a modified retrospective transition method or (ii) a prospective transition method. The modified retrospective transition method is applied by means of a cumulative-effect adjustment to residential mortgage loans and foreclosed residential real estate properties existing as of the beginning of the period for which the amendments of ASU 2014-04 are effective, with real estate reclassified to loans measured at the carrying value of the real estate at the date of adoption and loans reclassified to real estate measured at the lower of net carrying value of the loan or the fair value of the real estate less costs to sell at the date of adoption. The prospective transition method is applied by means of applying the amendments of ASU 2014-04 to all instances of receiving physical possession of residential real estate properties that occur after the date of adoption. The adoption of ASU 2014-04 on January 1, 2015 did not have a material impact on the Corporation's consolidated financial condition or results of operations.

Share-Based Compensation

In June 2014, the FASB issued ASU 2014-12, Compensation—Stock Compensation (Topic 718): Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period, a consensus of the FASB Emerging Issues Task Force (ASU 2014-12). ASU 2014-12 requires that a performance target that affects vesting of share-based payment awards and that could be achieved after the requisite service period be treated as a performance condition. Compensation cost should be recognized in the period in which it becomes probable that the performance target will be achieved and should represent the compensation cost attributable to the periods for which the requisite service has already been rendered. If the performance target becomes probable of being achieved before the end of the requisite service period, the remaining unrecognized compensation cost should be recognized prospectively over the remaining requisite service period. The total amount of compensation cost recognized during and after the requisite service period should reflect the number of awards that are expected to vest and should be adjusted to reflect those awards that ultimately vest. The requisite service period ends when the employee can cease rendering service and still be eligible to vest in the award if the performance target is achieved. ASU 2014-12 is effective for all entities for interim and annual periods beginning after December 15, 2015, with early adoption permitted. An entity may apply the amendments in ASU 2014-12 either (i) prospectively to all awards granted or modified after the effective date or (ii) retrospectively to all awards with performance targets that are outstanding as of the beginning of the earliest annual period presented in the financial statements and to all new or modified awards thereafter. The Corporation's early adoption of ASU 2014-12 on January 1, 2015 did not have a material impact on the Corporation's consolidated financial condition or results of operations.

Government-Guaranteed Mortgage Loans

In August 2014, the FASB issued ASU 2014-14, Receivables-Troubled Debt Restructurings by Creditors (Subtopic 310-40): Classification of Certain Government Guaranteed Mortgage Loans upon Foreclosure, a consensus of the FASB Emerging Issues Task Force (ASU 2014-14). ASU 2014-14 provides clarifying guidance related to how creditors classify government-guaranteed loans upon foreclosure. Upon foreclosure of a government-guaranteed mortgage loan, the loan should be derecognized and a separate other receivable should be recognized if the following conditions are met: (i) the loan has a government guarantee that is not separable from the loan before foreclosure; (ii) at the time of foreclosure, the creditor has the intent to convey the real estate property to the guarantor and make a claim on the guarantee, and the creditor has the ability to recover under that claim; and (iii) at the time of foreclosure, any amount of the claim that is determined on the basis of the fair value of the real estate is fixed. The separate other receivable should be measured based on the amount of the loan balance (principal and interest) expected to be recovered from the guarantor at the time of foreclosure. ASU 2014-14 is effective for public companies for interim and annual periods beginning after December 15, 2014. An entity should adopt using either the modified retrospective method or the prospective transition method. An entity must apply the same method elected under ASU 2014-04. Early adoption is permitted if the entity has already adopted ASU 2014-04. The adoption of ASU 2014-14 on January 1, 2015 did not have a material impact on the Corporation's consolidated financial condition or results of operations.

16

Chemical Financial Corporation

Notes to Consolidated Financial Statements (Unaudited)

March 31, 2015

Pending Accounting Pronouncements

There are no recent accounting pronouncements that have been issued by the FASB that would have a material impact on the financial statements of the Corporation.

Note 2: Acquisitions

Pending Acquisition of Lake Michigan Financial Corporation

On January 5, 2015, the Corporation entered into an Agreement and Plan of Merger with Lake Michigan Financial Corporation (Lake Michigan). Under the terms of the merger agreement, each Lake Michigan shareholder will receive $16.64 in cash and 1.326 shares of the Corporation's common stock for each share of Lake Michigan common stock. Based on the 30-day volume weighted price per share of the Corporation's common stock as of January 5, 2015, the merger has a transaction value of approximately $184.1 million. The merger has received regulatory approval. Completion of the merger is subject to the approval of Lake Michigan's shareholders, in addition to satisfaction of other customary closing conditions.

Acquisition of Monarch Community Bancorp, Inc.

On April 1, 2015, the Corporation acquired all of the outstanding stock of Monarch Community Bancorp, Inc. (Monarch) in an all-stock transaction valued at $27.2 million. As a result of the acquisition, the Corporation issued approximately 861,000 shares of its common stock based on an exchange ratio of 0.0982 shares of its common stock for each share of Monarch common stock outstanding. There are no contingencies resulting from the acquisition.

Monarch, a bank holding company, owned Monarch Community Bank, which operates five full service branch offices in Coldwater, Marshall, Hillsdale and Union City, Michigan. Monarch Community Bank will be operated as a separate subsidiary of the Corporation until its planned consolidation with and into Chemical Bank in May 2015. At March 31, 2015, and without the effect of fair value purchase accounting adjustments, Monarch had total assets of $170 million, total loans of $128 million and total deposits of $143 million.

Certain disclosures are required by the Corporation for business combinations that have occurred after the reporting date but before the financial statements are issued, unless the initial accounting for the business combination is incomplete at the time the financial statements are issued. The Corporation is in the process of completing its initial accounting related to the acquisition of Monarch, including finalizing the fair values of the assets acquired and liabilities assumed, and expects to have this information available for disclosure when it files its Quarterly Report on Form 10-Q for the quarter ending June 30, 2015.

Acquisition of Northwestern Bancorp, Inc.

On October 31, 2014, the Corporation acquired all of the outstanding stock of Northwestern Bancorp, Inc. (Northwestern) for total cash consideration of $121 million. Northwestern, a bank holding company which owned Northwestern Bank, provided traditional banking services and products through 25 banking offices serving communities in the northwestern lower peninsula of Michigan. At the acquisition date, Northwestern added total assets of $815 million, including total loans of $475 million, and total deposits of $794 million to the Corporation. Northwestern Bank was consolidated with and into Chemical Bank as of the acquisition date. In connection with the acquisition of Northwestern, the Corporation recorded $60.0 million of goodwill, which was primarily attributable to the synergies and economies of scale expected from combining the operations of the Corporation and Northwestern. In addition, the Corporation recorded $12.9 million of core deposit intangible assets in conjunction with the acquisition.

Upon acquisition, the Northwestern loan portfolio had contractually required principal and interest payments receivable of $507 million and $112 million, respectively, expected principal and interest cash flows of $481 million and $104 million, respectively, and a fair value of $475 million. The difference between the contractually required payments receivable and the expected cash flows represents the nonaccretable difference, which totaled $34 million at the acquisition date, with $26 million attributable to expected credit losses. The difference between the expected cash flows and fair value represents the accretable yield, which totaled $110 million at the acquisition date. The outstanding contractual principal balance and the carrying amount of the Northwestern acquired loan portfolio were $453 million and $421 million, respectively, at March 31, 2015, compared to $485 million and $452 million, respectively, at December 31, 2014.

17

Chemical Financial Corporation

Notes to Consolidated Financial Statements (Unaudited)

March 31, 2015

Acquisition of 21 Branches

On December 7, 2012, Chemical Bank acquired 21 branches from Independent Bank, a subsidiary of Independent Bank Corporation, located in the Northeast and Battle Creek regions of Michigan, including $404 million in deposits and $44 million in loans (branch acquisition transaction). The purchase price of the branch offices, including equipment, was $8.1 million and the Corporation paid a premium on deposits of $11.5 million, or approximately 2.85% of total deposits. The loans were purchased at a discount of 1.75%. In connection with the branch acquisition transaction, the Corporation recorded goodwill of $6.8 million and other intangible assets attributable to customer core deposits of $5.6 million.

Acquisition of O.A.K. Financial Corporation (OAK)

On April 30, 2010, the Corporation acquired OAK in an all-stock transaction for total consideration of $83.7 million. OAK provided traditional banking services and products through 14 banking offices serving communities in Ottawa, Allegan and Kent counties in west Michigan. At the acquisition date, OAK added total assets of $820 million, including total loans of $627 million, and total deposits of $693 million, including brokered deposits of $193 million. Upon acquisition, the OAK loan portfolio had contractually required principal payments receivable of $683 million and a fair value of $627 million. The outstanding contractual principal balance and the carrying amount of the OAK acquired loan portfolio were $255 million and $234 million, respectively, at March 31, 2015, compared to $268 million and $246 million, respectively, at December 31, 2014 and $313 million and $289 million, respectively, at March 31, 2014.

Accretable Yield

Activity for the accretable yield, which includes contractually due interest for acquired loans that have been renewed or extended since the date of acquisition and continue to be accounted for in loan pools in accordance with ASC 310-30, follows:

	Three Months Ended March 31,
	2015									2014
	Northwestern			OAK			Total			OAK
	(In thousands)
Balance at beginning of period	$	104,675		$	33,286		137,961			$	32,610
Additions (reductions)*	(1,410		)	714			(696		)	821
Accretion recognized in interest income	(4,998		)	(3,207		)	(8,205		)	(3,843		)
Reclassification from nonaccretable difference	—			—			—			10,000
Balance at end of period	$	98,267		$	30,793		$	129,060		$	39,588

* Represents additions of estimated contractual interest expected to be collected from acquired loans being renewed or extended, less reductions in contractual interest resulting from the early payoff of acquired loans.

18

Chemical Financial Corporation

Notes to Consolidated Financial Statements (Unaudited)

March 31, 2015

Note 3: Investment Securities

The following is a summary of the amortized cost and fair value of investment securities available-for-sale and investment securities held-to-maturity at March 31, 2015, December 31, 2014 and March 31, 2014:

	Investment Securities Available-for-Sale
	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value
	(In thousands)
March 31, 2015
U.S. Treasury securities	$	8,271	$	31	$	—	$	8,302
Government sponsored agencies	249,642		889		101		250,430
State and political subdivisions	31,701		624		3		32,322
Residential mortgage-backed securities	218,299		1,358		56		219,601
Collateralized mortgage obligations	133,713		305		718		133,300
Corporate bonds	34,925		136		64		34,997
Preferred stock	1,389		303		—		1,692
Total	$	677,940	$	3,646	$	942	$	680,644
December 31, 2014
U.S. Treasury securities	$	8,272	$	—	$	13	$	8,259
Government sponsored agencies	263,658		356		511		263,503
State and political subdivisions	45,157		1,087		17		46,227
Residential mortgage-backed securities	240,465		885		1,543		239,807
Collateralized mortgage obligations	145,316		261		1,194		144,383
Corporate bonds	44,930		213		48		45,095
Preferred stock	1,389		201		—		1,590
Total	$	749,187	$	3,003	$	3,326	$	748,864
March 31, 2014
Government sponsored agencies	$	91,613	$	295	$	298	$	91,610
State and political subdivisions	42,369		1,408		—		43,777
Residential mortgage-backed securities	291,187		1,023		3,472		288,738
Collateralized mortgage obligations	167,622		393		1,296		166,719
Corporate bonds	65,003		505		93		65,415
Preferred stock	1,389		170		—		1,559
Total	$	659,183	$	3,794	$	5,159	$	657,818

19

Chemical Financial Corporation

Notes to Consolidated Financial Statements (Unaudited)

March 31, 2015

	Investment Securities Held-to-Maturity
	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value
	(In thousands)
March 31, 2015
State and political subdivisions	$	370,950	$	6,852	$	4,926	$	372,876
Trust preferred securities	10,500		—		3,200		7,300
Total	$	381,450	$	6,852	$	8,126	$	380,176
December 31, 2014
State and political subdivisions	$	305,913	$	7,294	$	4,557	$	308,650
Trust preferred securities	10,500		—		3,410		7,090
Total	$	316,413	$	7,294	$	7,967	$	315,740
March 31, 2014
State and political subdivisions	$	267,599	$	5,331	$	6,983	$	265,947
Trust preferred securities	10,500		—		4,040		6,460
Total	$	278,099	$	5,331	$	11,023	$	272,407

The majority of the Corporation’s residential mortgage-backed securities and collateralized mortgage obligations are backed by a U.S. government agency (Government National Mortgage Association) or a government sponsored enterprise (Federal Home Loan Mortgage Corporation or Federal National Mortgage Association).

At March 31, 2015, the Corporation held $10.5 million of trust preferred investment securities that were recorded as held-to-maturity, with $10.0 million of these securities representing a 100% interest in a trust preferred investment security of a small non-public bank holding company in Michigan that has been assessed by the Corporation as financially strong. The remaining $0.5 million represents a 10% interest in another trust preferred investment security of a small non-public bank holding company located in Michigan that was categorized as well-capitalized under regulatory guidelines at March 31, 2015.

At March 31, 2015, it was the Corporation’s opinion that the market for trust preferred investment securities was not active, and thus, in accordance with GAAP, when there is a significant decrease in the volume and activity for an asset or liability in relation to normal market activity, adjustments to transaction or quoted prices may be necessary or a change in valuation technique or multiple valuation techniques may be appropriate. The Corporation obtained pricing information for its trust preferred investment securities from an independent third-party pricing source. The pricing information was based on both observable inputs and unobservable inputs, including appropriate risk adjustments that market participants would make for possible nonperformance, illiquidity and issuer specifics such as size, leverage position and location. The observable inputs were based on the existing market and insight into appropriate rate of return adjustments that market participants would require for the additional risk associated with a single issue investment security of this nature. Based on the information obtained from the independent third-party pricing source, the Corporation calculated a fair value at March 31, 2015 of $7.0 million on its $10.0 million trust preferred investment security and $0.3 million on its $0.5 million trust preferred investment security, resulting in a combined unrealized loss of $3.2 million at that date.

20

Chemical Financial Corporation

Notes to Consolidated Financial Statements (Unaudited)

March 31, 2015

The following is a summary of the amortized cost and fair value of investment securities at March 31, 2015, by maturity, for both available-for-sale and held-to-maturity investment securities. The maturities of residential mortgage-backed securities and collateralized mortgage obligations are based on scheduled principal payments. The maturities of all other debt securities are based on final contractual maturity.

	March 31, 2015
	Amortized Cost		Fair Value
	(In thousands)
Investment Securities Available-for-Sale:
Due in one year or less	$	180,558	$	180,869
Due after one year through five years	442,088		443,752
Due after five years through ten years	50,902		51,302
Due after ten years	3,003		3,029
Preferred stock	1,389		1,692
Total	$	677,940	$	680,644
Investment Securities Held-to-Maturity:
Due in one year or less	$	35,293	$	35,365
Due after one year through five years	171,557		172,699
Due after five years through ten years	120,799		122,512
Due after ten years	53,801		49,600
Total	$	381,450	$	380,176

21

Chemical Financial Corporation

Notes to Consolidated Financial Statements (Unaudited)

March 31, 2015

The following schedule summarizes information for both available-for-sale and held-to-maturity investment securities with gross unrealized losses at March 31, 2015, December 31, 2014 and March 31, 2014, aggregated by category and length of time that individual securities have been in a continuous unrealized loss position.

	Less Than 12 Months				12 Months or More				Total
	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
	(In thousands)
March 31, 2015
U.S. Treasury securities	$	—	$	—	$	—	$	—	$	—	$	—
Government sponsored agencies	27,889		64		18,896		37		46,785		101
State and political subdivisions	156,010		1,989		49,839		2,940		205,849		4,929
Residential mortgage-backed securities	82,303		28		3,847		28		86,150		56
Collateralized mortgage obligations	22,694		22		41,061		696		63,755		718
Corporate bonds	4,989		11		14,946		53		19,935		64
Trust preferred securities	—		—		7,300		3,200		7,300		3,200
Total	$	293,885	$	2,114	$	135,889	$	6,954	$	429,774	$	9,068
December 31, 2014
U.S. Treasury securities	$	8,259	$	13	$	—	$	—	$	8,259	$	13
Government sponsored agencies	166,963		406		31,927		105		198,890		511
State and political subdivisions	62,310		3,348		36,847		1,226		99,157		4,574
Residential mortgage-backed securities	17,276		52		180,194		1,491		197,470		1,543
Collateralized mortgage obligations	63,077		179		31,620		1,015		94,697		1,194
Corporate bonds	—		—		14,952		48		14,952		48
Trust preferred securities	—		—		7,090		3,410		7,090		3,410
Total	$	317,885	$	3,998	$	302,630	$	7,295	$	620,515	$	11,293
March 31, 2014
Government sponsored agencies	$	45,396	$	110	$	15,204	$	188	$	60,600	$	298
State and political subdivisions	79,787		4,942		56,180		2,041		135,967		6,983
Residential mortgage-backed securities	247,397		3,472		—		—		247,397		3,472
Collateralized mortgage obligations	76,900		885		12,833		411		89,733		1,296
Corporate bonds	—		—		14,907		93		14,907		93
Trust preferred securities	—		—		6,460		4,040		6,460		4,040
Total	$	449,480	$	9,409	$	105,584	$	6,773	$	555,064	$	16,182

An assessment is performed quarterly by the Corporation to determine whether unrealized losses in its investment securities portfolio are temporary or other-than-temporary by carefully considering all available information. The Corporation reviews factors such as financial statements, credit ratings, news releases and other pertinent information of the underlying issuer or company to make its determination. Management did not believe any individual unrealized loss on any investment security, as of March 31, 2015, represented an other-than-temporary impairment (OTTI). Management believed that the unrealized losses on investment securities at March 31, 2015 were temporary in nature and due primarily to changes in interest rates and reduced market liquidity and not as a result of credit-related issues. Unrealized losses of $3.2 million in the trust preferred securities portfolio, related to trust preferred securities of two well-capitalized bank holding companies in Michigan, were attributable to illiquidity in financial markets for these types of investments. The Corporation performed an analysis of the creditworthiness of these issuers and concluded that, at March 31, 2015, the Corporation expected to recover the entire amortized cost basis of these investment securities.

At March 31, 2015, the Corporation did not have the intent to sell any of its impaired investment securities and believed that it was more-likely-than-not that the Corporation will not have to sell any such investment securities before a full recovery of amortized cost. Accordingly, at March 31, 2015, the Corporation believed the impairments in its investment securities portfolio were temporary in nature. However, there is no assurance that OTTI may not occur in the future.

22

Chemical Financial Corporation

Notes to Consolidated Financial Statements (Unaudited)

March 31, 2015

Note 4: Loans

Loan portfolio segments are defined as the level at which an entity develops and documents a systematic methodology to determine its allowance. The Corporation has two loan portfolio segments (commercial loans and consumer loans) that it uses in determining the allowance. Both quantitative and qualitative factors are used by management at the loan portfolio segment level in determining the adequacy of the allowance for the Corporation. Classes of loans are a disaggregation of an entity’s loan portfolio segments. Classes of loans are defined as a group of loans which share similar initial measurement attributes, risk characteristics, and methods for monitoring and assessing credit risk. The Corporation has seven classes of loans, which are set forth below.

Commercial — Loans and lines of credit to varying types of businesses, including municipalities, school districts and nonprofit organizations, for the purpose of supporting working capital, operational needs and term financing of equipment. Repayment of such loans is generally provided through operating cash flows of the business. Commercial loans are predominately secured by equipment, inventory, accounts receivable, personal guarantees of the owner and other sources of repayment, although the Corporation may also secure commercial loans with real estate.

Commercial real estate — Loans secured by real estate occupied by the borrower for ongoing operations, non-owner occupied real estate leased to one or more tenants and vacant land that has been acquired for investment or future land development.

Real estate construction — Secured loans for the construction of business properties. Real estate construction loans often convert to a commercial real estate loan at the completion of the construction period.

Land development — Secured development loans made to borrowers for the purpose of infrastructure improvements to vacant land to create finished marketable residential and commercial lots/land. Most land development loans are originated with the intention that the loans will be paid through the sale of developed lots/land by the developers within twelve months of the completion date. Land development loans at March 31, 2015, December 31, 2014 and March 31, 2014 were primarily comprised of loans to develop residential properties.

Residential mortgage — Loans secured by one- to four-family residential properties, generally with fixed interest rates for periods of fifteen years or less. The loan-to-value ratio at the time of origination is generally 80% or less. Residential mortgage loans with a loan-to-value ratio of more than 80% generally require private mortgage insurance.

Consumer installment — Loans to consumers primarily for the purpose of acquiring automobiles, recreational vehicles and personal watercraft. These loans consist of relatively small amounts that are spread across many individual borrowers.

Home equity — Loans and lines of credit whereby consumers utilize equity in their personal residence, generally through a second mortgage, as collateral to secure the loan.

Commercial, commercial real estate, real estate construction and land development loans are referred to as the Corporation’s commercial loan portfolio, while residential mortgage, consumer installment and home equity loans are referred to as the Corporation’s consumer loan portfolio. A summary of loans follows:

	March 31, 2015		December 31, 2014		March 31, 2014
	(In thousands)
Commercial loan portfolio:
Commercial	$	1,356,169	$	1,354,881	$	1,208,641
Commercial real estate	1,616,923		1,557,648		1,279,167
Real estate construction	95,923		152,745		85,084
Land development	12,916		18,750		13,761
Subtotal	3,081,931		3,084,024		2,586,653
Consumer loan portfolio:
Residential mortgage	1,117,445		1,110,390		962,009
Consumer installment	844,066		829,570		675,412
Home equity	659,432		664,246		529,215
Subtotal	2,620,943		2,604,206		2,166,636
Total loans	$	5,702,874	$	5,688,230	$	4,753,289

23

Chemical Financial Corporation

Notes to Consolidated Financial Statements (Unaudited)

March 31, 2015

Credit Quality Monitoring

The Corporation maintains loan policies and credit underwriting standards as part of the process of managing credit risk. These standards include making loans generally only within the Corporation’s market areas. The Corporation’s lending markets generally consist of communities across the lower peninsula of Michigan, except for the southeastern portion of Michigan. The Corporation has no foreign loans.

The Corporation has a commercial loan portfolio approval process involving underwriting and individual and group loan approval authorities to consider credit quality and loss exposure at loan origination. The loans in the Corporation’s commercial loan portfolio are risk rated at origination based on the grading system set forth below. The approval authority of relationship managers is established based on experience levels, with credit decisions greater than $1.0 million requiring group loan authority approval, except for six executive and senior officers who have varying limits exceeding $1.5 million and up to $3.5 million. During the first quarter of 2015, the Corporation increased the upper range for each level of group loan authority by$5.0 million, resulting in group loan authorities as follows. The Corporation has a loan committee, consisting of certain executive and senior officers, that meets weekly to consider loans ranging in amounts from $1.0 million to $10.0 million, depending on risk rating and credit action required. A directors’ loan committee, consisting of eight independent members of the board of directors, the chief executive officer and senior credit officer, meets bi-weekly to consider loans in amounts over $10.0 million, and certain loans under $10.0 million depending on a loan’s risk rating and credit action required. Loans over $15.0 million require majority approval of the board of directors.

The majority of the Corporation’s consumer loan portfolio is comprised of secured loans that are relatively small. The Corporation’s consumer loan portfolio has a centralized approval process which utilizes standardized underwriting criteria. The ongoing measurement of credit quality of the consumer loan portfolio is largely done on an exception basis. If payments are made on schedule, as agreed, then no further monitoring is performed. However, if delinquency occurs, the delinquent loans are turned over to the Corporation’s collection department for resolution, resulting in repossession or foreclosure if payments are not brought current. Credit quality for the entire consumer loan portfolio is measured by the periodic delinquency rate, nonaccrual amounts and actual losses incurred.

Loans in the commercial loan portfolio tend to be larger and more complex than those in the consumer loan portfolio, and therefore, are subject to more intensive monitoring. All loans in the commercial loan portfolio have an assigned relationship manager, and most borrowers provide periodic financial and operating information that allows the relationship managers to stay abreast of credit quality during the life of the loans. The risk ratings of loans in the commercial loan portfolio are reassessed at least annually, with loans below an acceptable risk rating reassessed more frequently and reviewed by various loan committees within the Corporation at least quarterly.

The Corporation maintains a centralized independent loan review function that monitors the approval process and ongoing asset quality of the loan portfolio, including the accuracy of loan grades. The Corporation also maintains an independent appraisal review function that participates in the review of all appraisals obtained by the Corporation for loans in the commercial loan portfolio.

Credit Quality Indicators

Commercial Loan Portfolio

The Corporation uses a nine grade risk rating system to monitor the ongoing credit quality of its commercial loan portfolio. These loan grades rank the credit quality of a borrower by measuring liquidity, debt capacity, coverage and payment behavior as shown in the borrower’s financial statements. The loan grades also measure the quality of the borrower’s management and the repayment support offered by any guarantors. A summary of the Corporation’s loan grades (or characteristics of the loans within each grade) follows:

Risk Grades 1-5 (Acceptable Credit Quality) — All loans in risk grades 1 through 5 are considered to be acceptable credit risks by the Corporation and are grouped for purposes of allowance for loan loss considerations and financial reporting. The five grades essentially represent a ranking of loans that are all viewed to be of acceptable credit quality, taking into consideration the various factors mentioned above, but with varying degrees of financial strength, debt coverage, management and factors that could impact credit quality. Business credits within risk grades 1 through 5 range from Risk Grade 1: Prime Quality (factors include: excellent business credit; excellent debt capacity and coverage; outstanding management; strong guarantors; superior liquidity and net worth; favorable loan-to-value ratios; debt secured by cash or equivalents, or backed by the full faith and credit of the U.S. Government) to Risk Grade 5: Acceptable Quality With Care (factors include: acceptable business credit, but with added risk due to specific industry or internal situations).

24

Chemical Financial Corporation

Notes to Consolidated Financial Statements (Unaudited)

March 31, 2015

Risk Grade 6 (Watch) — A business credit that is not acceptable within the Corporation’s loan origination criteria; cash flow may not be adequate or is continually inconsistent to service current debt; financial condition has deteriorated as company trends/management have become inconsistent; the company is slow in furnishing quality financial information; working capital needs of the company are reliant on short-term borrowings; personal guarantees are weak and/or with little or no liquidity; the net worth of the company has deteriorated after recent or continued losses; the loan requires constant monitoring and attention from the Corporation; payment delinquencies becoming more serious; if left uncorrected, these potential weaknesses may, at some future date, result in deterioration of repayment prospects.

Risk Grade 7 (Substandard — Accrual) — A business credit that is inadequately protected by the current financial net worth and paying capacity of the obligor or of the collateral pledged, if any; management has deteriorated or has become non-existent; quality financial information is not available; a high level of maintenance is required by the Corporation; cash flow can no longer support debt requirements; loan payments are continually and/or severely delinquent; negative net worth; personal guaranty has become insignificant; a credit that has a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. The Corporation still expects a full recovery of all contractual principal and interest payments; however, a possibility exists that the Corporation will sustain some loss if deficiencies are not corrected.

Risk Grade 8 (Substandard — Nonaccrual) — A business credit accounted for on a nonaccrual basis that has all the weaknesses inherent in a loan classified as risk grade 7 with the added characteristic that the weaknesses are so pronounced that, on the basis of current financial information, conditions, and values, collection in full is highly questionable; a partial loss is possible and interest is no longer being accrued. This loan meets the definition of an impaired loan. The risk of loss requires analysis to determine whether a valuation allowance needs to be established.

Risk Grade 9 (Substandard — Doubtful) — A business credit that has all the weaknesses inherent in a loan classified as risk grade 8 and interest is no longer being accrued, but additional deficiencies make it highly probable that liquidation will not satisfy the majority of the obligation; the primary source of repayment is nonexistent and there is doubt as to the value of the secondary source of repayment; the possibility of loss is likely, but current pending factors could strengthen the credit. This loan meets the definition of an impaired loan. A loan charge-off is recorded when management deems an amount uncollectible; however, the Corporation will establish a valuation allowance for probable losses, if required.

The Corporation considers all loans graded 1 through 5 as acceptable credit risks and structures and manages such relationships accordingly. Periodic financial and operating data combined with regular loan officer interactions are deemed adequate to monitor borrower performance. Loans graded 6 and 7 are considered higher-risk credits than loans graded 1 through 5 and the frequency of loan officer contact and receipt of financial data is increased to stay abreast of borrower performance. Loans graded 8 and 9 are considered problematic and require special care. Further, loans graded 6 through 9 are managed and monitored regularly through a number of processes, procedures and committees, including oversight by a loan administration committee comprised of executive and senior management of the Corporation, which include highly structured reporting of financial and operating data, intensive loan officer intervention and strategies to exit, as well as potential management by the Corporation’s special assets group.

25

Chemical Financial Corporation

Notes to Consolidated Financial Statements (Unaudited)

March 31, 2015

The following schedule presents the recorded investment of loans in the commercial loan portfolio by risk rating categories at March 31, 2015, December 31, 2014 and March 31, 2014:

	Commercial		Commercial Real Estate		Real Estate Construction		Land Development		Total
	(In thousands)
March 31, 2015
Originated Portfolio:
Risk Grades 1-5	$	1,176,021	$	1,175,373	$	93,864	$	2,633	$	2,447,891
Risk Grade 6	40,999		44,248		—		738		85,985
Risk Grade 7	28,983		27,961		1,396		601		58,941
Risk Grade 8	18,904		24,760		663		290		44,617
Risk Grade 9	—		6		—		—		6
Subtotal	1,264,907		1,272,348		95,923		4,262		2,637,440
Acquired Portfolio:
Risk Grades 1-5	71,422		318,113		—		6,724		396,259
Risk Grade 6	11,299		7,786		—		253		19,338
Risk Grade 7	6,509		12,735		—		140		19,384
Risk Grade 8	2,032		5,941		—		1,537		9,510
Risk Grade 9	—		—		—		—		—
Subtotal	91,262		344,575		—		8,654		444,491
Total	$	1,356,169	$	1,616,923	$	95,923	$	12,916	$	3,081,931
December 31, 2014
Originated Portfolio:
Risk Grades 1-5	$	1,171,817	$	1,114,529	$	134,668	$	2,952	$	2,423,966
Risk Grade 6	37,800		34,996		1,408		738		74,942
Risk Grade 7	29,863		29,935		2,502		613		62,913
Risk Grade 8	16,417		24,958		162		225		41,762
Risk Grade 9	1		8		—		—		9
Subtotal	1,255,898		1,204,426		138,740		4,528		2,603,592
Acquired Portfolio:
Risk Grades 1-5	76,780		321,018		14,005		11,789		423,592
Risk Grade 6	12,687		8,698		—		583		21,968
Risk Grade 7	4,089		12,478		—		197		16,764
Risk Grade 8	5,427		11,028		—		1,653		18,108
Risk Grade 9	—		—		—		—		—
Subtotal	98,983		353,222		14,005		14,222		480,432
Total	$	1,354,881	$	1,557,648	$	152,745	$	18,750	$	3,084,024
March 31, 2014
Originated Portfolio:
Risk Grades 1-5	$	1,060,743	$	1,034,517	$	70,750	$	3,831	$	2,169,841
Risk Grade 6	18,359		33,962		680		968		53,969
Risk Grade 7	33,768		32,671		815		700		67,954
Risk Grade 8	17,301		27,552		160		2,267		47,280
Risk Grade 9	950		16		—		—		966
Subtotal	1,131,121		1,128,718		72,405		7,766		2,340,010
Acquired Portfolio:
Risk Grades 1-5	67,326		139,130		12,679		3,906		223,041
Risk Grade 6	2,423		2,627		—		—		5,050
Risk Grade 7	3,635		7,753		—		—		11,388
Risk Grade 8	4,136		939		—		2,089		7,164
Risk Grade 9	—		—		—		—		—
Subtotal	77,520		150,449		12,679		5,995		246,643
Total	$	1,208,641	$	1,279,167	$	85,084	$	13,761	$	2,586,653

26

Chemical Financial Corporation

Notes to Consolidated Financial Statements (Unaudited)

March 31, 2015

Consumer Loan Portfolio

The Corporation evaluates the credit quality of loans in the consumer loan portfolio based on the performing or nonperforming status of the loan. Loans in the consumer loan portfolio that are performing in accordance with original contractual terms and are less than 90 days past due and accruing interest are considered to be in a performing status, while those that are in nonaccrual status, contractually past due 90 days or more as to interest or principal payments or classified as a nonperforming TDR are considered to be in a nonperforming status. Nonaccrual TDRs in the consumer loan portfolio are included with nonaccrual loans, while other TDRs in the consumer loan portfolio are considered in a nonperforming status until they meet the Corporation’s definition of a performing TDR, at which time they are considered in a performing status.

The following schedule presents the recorded investment of loans in the consumer loan portfolio based on loans in a performing status and loans in a nonperforming status at March 31, 2015, December 31, 2014 and March 31, 2014:

	Residential Mortgage		Consumer Installment		Home Equity		Total Consumer
	(In thousands)
March 31, 2015
Originated Loans:
Performing	$	998,196	$	834,926	$	565,992	$	2,399,114
Nonperforming	9,376		433		2,299		12,108
Subtotal	1,007,572		835,359		568,291		2,411,222
Acquired Loans:
Performing	109,005		8,696		90,686		208,387
Nonperforming	868		11		455		1,334
Subtotal	109,873		8,707		91,141		209,721
Total	$	1,117,445	$	844,066	$	659,432	$	2,620,943
December 31, 2014
Originated Loans:
Performing	$	987,542	$	818,878	$	566,083	$	2,372,503
Nonperforming	10,459		500		3,013		13,972
Subtotal	998,001		819,378		569,096		2,386,475
Acquired Loans:
Performing	111,101		10,174		94,696		215,971
Nonperforming	1,288		18		454		1,760
Subtotal	112,389		10,192		95,150		217,731
Total	$	1,110,390	$	829,570	$	664,246	$	2,604,206
March 31, 2014
Originated Loans:
Performing	$	937,968	$	672,984	$	497,196	$	2,108,148
Nonperforming	12,833		806		2,668		16,307
Subtotal	950,801		673,790		499,864		2,124,455
Acquired Loans:
Performing	11,150		1,622		29,020		41,792
Nonperforming	58		—		331		389
Subtotal	11,208		1,622		29,351		42,181
Total	$	962,009	$	675,412	$	529,215	$	2,166,636

27

Chemical Financial Corporation

Notes to Consolidated Financial Statements (Unaudited)

March 31, 2015

Nonperforming Loans

A summary of nonperforming loans follows:

	March 31, 2015		December 31, 2014		March 31, 2014
	(In thousands)
Nonaccrual loans:
Commercial	$	18,904	$	16,418	$	18,251
Commercial real estate	24,766		24,966		27,568
Real estate construction	663		162		160
Land development	290		225		2,267
Residential mortgage	6,514		6,706		6,589
Consumer installment	433		500		806
Home equity	1,870		1,667		2,046
Total nonaccrual loans	53,440		50,644		57,687
Accruing loans contractually past due 90 days or more as to interest or principal payments:
Commercial	52		170		43
Commercial real estate	148		—		730
Real estate construction	—		—		—
Land development	—		—		—
Residential mortgage	172		557		—
Consumer installment	—		—		—
Home equity	429		1,346		622
Total accruing loans contractually past due 90 days or more as to interest or principal payments	801		2,073		1,395
Nonperforming TDRs:
Commercial loan portfolio	15,810		15,271		11,218
Consumer loan portfolio	2,690		3,196		6,244
Total nonperforming TDRs	18,500		18,467		17,462
Total nonperforming loans	$	72,741	$	71,184	$	76,544

The Corporation’s nonaccrual loans at March 31, 2015, December 31, 2014 and March 31, 2014 included $37.3 million, $37.2 million and $44.4 million, respectively, of nonaccrual TDRs.

The Corporation had $2.2 million of residential mortgage loans that were in the process of foreclosure at March 31, 2015.

28

Chemical Financial Corporation

Notes to Consolidated Financial Statements (Unaudited)

March 31, 2015

Impaired Loans

The following schedule presents impaired loans by classes of loans at March 31, 2015, December 31, 2014 and March 31, 2014:

	Recorded Investment		Unpaid Principal Balance		Related Valuation Allowance
	(In thousands)
March 31, 2015
Impaired loans with a valuation allowance:
Commercial	$	3,433	$	3,527	$	1,119
Commercial real estate	1,780		1,961		496
Real estate construction	—		—		—
Land development	—		—		—
Residential mortgage	19,887		19,887		297
Subtotal	25,100		25,375		1,912
Impaired loans with no related valuation allowance:
Commercial	33,733		39,382		—
Commercial real estate	57,628		79,696		—
Real estate construction	663		836		—
Land development	1,877		3,428		—
Residential mortgage	7,382		7,382		—
Consumer installment	444		444		—
Home equity	2,325		2,325		—
Subtotal	104,052		133,493		—
Total impaired loans:
Commercial	37,166		42,909		1,119
Commercial real estate	59,408		81,657		496
Real estate construction	663		836		—
Land development	1,877		3,428		—
Residential mortgage	27,269		27,269		297
Consumer installment	444		444		—
Home equity	2,325		2,325		—
Total	$	129,152	$	158,868	$	1,912
December 31, 2014
Impaired loans with a valuation allowance:
Commercial	$	966	$	1,040	$	293
Commercial real estate	2,587		2,927		710
Real estate construction	—		—		—
Land development	—		—		—
Residential mortgage	19,681		19,681		335
Subtotal	23,234		23,648		1,338
Impaired loans with no related valuation allowance:
Commercial	38,094		44,557		—
Commercial real estate	60,616		82,693		—
Real estate construction	162		255		—
Land development	1,928		3,484		—
Residential mortgage	7,994		7,994		—
Consumer installment	518		518		—
Home equity	2,121		2,121		—
Subtotal	111,433		141,622		—
Total impaired loans:
Commercial	39,060		45,597		293
Commercial real estate	63,203		85,620		710
Real estate construction	162		255		—
Land development	1,928		3,484		—
Residential mortgage	27,675		27,675		335
Consumer installment	518		518		—
Home equity	2,121		2,121		—
Total	$	134,667	$	165,270	$	1,338

29

Chemical Financial Corporation

Notes to Consolidated Financial Statements (Unaudited)

March 31, 2015

	Recorded Investment		Unpaid Principal Balance		Related Valuation Allowance
	(In thousands)
March 31, 2014
Impaired loans with a valuation allowance:
Commercial	$	3,534	$	3,704	$	1,250
Commercial real estate	3,720		3,878		371
Real estate construction	—		—		—
Land development	—		—		—
Residential mortgage	19,944		19,944		444
Subtotal	27,198		27,526		2,065
Impaired loans with no related valuation allowance:
Commercial	38,150		42,914		—
Commercial real estate	49,074		62,207		—
Real estate construction	160		366		—
Land development	4,472		7,773		—
Residential mortgage	6,589		6,589		—
Consumer installment	806		806		—
Home equity	2,046		2,046		—
Subtotal	101,297		122,701		—
Total impaired loans:
Commercial	41,684		46,618		1,250
Commercial real estate	52,794		66,085		371
Real estate construction	160		366		—
Land development	4,472		7,773		—
Residential mortgage	26,533		26,533		444
Consumer installment	806		806		—
Home equity	2,046		2,046		—
Total	$	128,495	$	150,227	$	2,065

The difference between an impaired loan’s recorded investment and the unpaid principal balance for originated loans represents a partial charge-off resulting from a confirmed loss due to the value of the collateral securing the loan being below the loan balance and management’s assessment that full collection of the loan balance is not likely, and for acquired loans that meet the definition of an impaired loan represents fair value adjustments recognized at the acquisition date attributable to expected credit losses and the discounting of expected cash flows at market interest rates. The difference between the recorded investment and the unpaid principal balance of $29.7 million, $30.6 million and $21.7 million at March 31, 2015, December 31, 2014 and March 31, 2014, respectively, includes confirmed losses (partial charge-offs) of $14.8 million, $15.4 million and $17.8 million, respectively, and fair value discount adjustments of $14.9 million, $15.2 million and $3.9 million, respectively.

Impaired loans included $11.2 million, $19.9 million and $11.5 million at March 31, 2015, December 31, 2014 and March 31, 2014, respectively, of acquired loans that were not performing in accordance with original contractual terms. Acquired loans that are not performing in accordance with contractual terms are not reported as nonperforming loans because these loans are recorded in pools at their net realizable value based on the principal and interest the Corporation expects to collect on these loans. Impaired loans also included $46.0 million, $45.7 million and $41.8 million at March 31, 2015, December 31, 2014 and March 31, 2014, respectively, of performing TDRs.

30

Chemical Financial Corporation

Notes to Consolidated Financial Statements (Unaudited)

March 31, 2015

The following schedule presents information related to impaired loans for the three months ended March 31, 2015 and 2014:

	Three Months Ended March 31, 2015
	Average Recorded Investment		Interest Income Recognized While on Impaired Status
	(In thousands)
Commercial	$	38,576	$	289
Commercial real estate	60,240		525
Real estate construction	640		—
Land development	1,875		27
Residential mortgage	27,352		331
Consumer installment	499		—
Home equity	2,352		8
Total	$	131,534	$	1,180

	Three Months Ended March 31, 2014
	Average Recorded Investment		Interest Income Recognized While on Impaired Status
	(In thousands)
Commercial	$	41,607	$	333
Commercial real estate	53,320		361
Real estate construction	167		—
Land development	4,643		37
Residential mortgage	26,781		303
Consumer installment	773		—
Home equity	2,168		—
Total	$	129,459	$	1,034

The following schedule presents the aging status of the recorded investment in loans by classes of loans at March 31, 2015, December 31, 2014 and March 31, 2014:

	31-60 Days Past Due		61-89 Days Past Due		Accruing Loans Past Due 90 Days or More		Non-accrual Loans		Total Past Due		Current		Total Loans
	(In thousands)
March 31, 2015
Originated Portfolio:
Commercial	$	10,121	$	729	$	52	$	18,904	$	29,806	$	1,235,101	$	1,264,907
Commercial real estate	7,238		2,267		148		24,766		34,419		1,237,929		1,272,348
Real estate construction	340		—		—		663		1,003		94,920		95,923
Land development	—		—		—		290		290		3,972		4,262
Residential mortgage	1,246		88		172		6,514		8,020		999,552		1,007,572
Consumer installment	2,143		344		—		433		2,920		832,439		835,359
Home equity	1,728		197		429		1,870		4,224		564,067		568,291
Total	$	22,816	$	3,625	$	801	$	53,440	$	80,682	$	4,967,980	$	5,048,662
Acquired Portfolio:
Commercial	$	59	$	5	$	2,089	$	—	$	2,153	$	89,109	$	91,262
Commercial real estate	1,784		138		6,271		—		8,193		336,382		344,575
Real estate construction	—		—		—		—		—		—		—
Land development	—		—		1,537		—		1,537		7,117		8,654
Residential mortgage	104		—		868		—		972		108,901		109,873
Consumer installment	3		1		11		—		15		8,692		8,707
Home equity	349		234		455		—		1,038		90,103		91,141
Total	$	2,299	$	378	$	11,231	$	—	$	13,908	$	640,304	$	654,212

31

Chemical Financial Corporation

Notes to Consolidated Financial Statements (Unaudited)

March 31, 2015

	31-60 Days Past Due		61-89 Days Past Due		Accruing Loans Past Due 90 Days or More		Non-accrual Loans		Total Past Due		Current		Total Loans
	(In thousands)
December 31, 2014
Originated Portfolio:
Commercial	$	4,033	$	743	$	170	$	16,418	$	21,364	$	1,234,534	$	1,255,898
Commercial real estate	7,515		1,383		—		24,966		33,864		1,170,562		1,204,426
Real estate construction	262		—		—		162		424		138,316		138,740
Land development	—		—		—		225		225		4,303		4,528
Residential mortgage	2,126		54		557		6,706		9,443		988,558		998,001
Consumer installment	3,620		512		—		500		4,632		814,746		819,378
Home equity	3,039		660		1,346		1,667		6,712		562,384		569,096
Total	$	20,595	$	3,352	$	2,073	$	50,644	$	76,664	$	4,913,403	$	4,990,067
Acquired Portfolio:
Commercial	$	133	$	—	$	5,427	$	—	$	5,560	$	93,423	$	98,983
Commercial real estate	2,014		352		11,052		—		13,418		339,804		353,222
Real estate construction	—		—		—		—		—		14,005		14,005
Land development	—		—		1,653		—		1,653		12,569		14,222
Residential mortgage	156		—		18		—		174		112,215		112,389
Consumer installment	55		3		454		—		512		9,680		10,192
Home equity	636		106		1,288		—		2,030		93,120		95,150
Total	$	2,994	$	461	$	19,892	$	—	$	23,347	$	674,816	$	698,163
March 31, 2014
Originated Portfolio:
Commercial	$	6,003	$	1,832	$	43	$	18,251	$	26,129	$	1,104,992	$	1,131,121
Commercial real estate	4,094		1,098		730		27,568		33,490		1,095,228		1,128,718
Real estate construction	18		—		—		160		178		72,227		72,405
Land development	—		—		—		2,267		2,267		5,499		7,766
Residential mortgage	1,259		1,138		—		6,589		8,986		941,815		950,801
Consumer installment	1,950		313		—		806		3,069		670,721		673,790
Home equity	1,500		256		622		2,046		4,424		495,440		499,864
Total	$	14,824	$	4,637	$	1,395	$	57,687	$	78,543	$	4,385,922	$	4,464,465
Acquired Portfolio:
Commercial	$	—	$	—	$	6,496	$	—	$	6,496	$	71,024	$	77,520
Commercial real estate	—		—		2,549		—		2,549		147,900		150,449
Real estate construction	—		—		—		—		—		12,679		12,679
Land development	—		—		2,089		—		2,089		3,906		5,995
Residential mortgage	—		—		58		—		58		11,150		11,208
Consumer installment	49		—		—		—		49		1,573		1,622
Home equity	49		—		331		—		380		28,971		29,351
Total	$	98	$	—	$	11,523	$	—	$	11,621	$	277,203	$	288,824

32

Chemical Financial Corporation

Notes to Consolidated Financial Statements (Unaudited)

March 31, 2015

Loans Modified Under Troubled Debt Restructurings (TDRs)

The following schedule presents the Corporation’s loans reported as TDRs at March 31, 2015, December 31, 2014 and March 31, 2014:

	Performing TDRs		Non-Performing TDRs		Nonaccrual TDRs		Total
	(In thousands)
March 31, 2015
Commercial loan portfolio	$	28,784	$	15,810	$	32,917	$	77,511
Consumer loan portfolio	17,197		2,690		4,426		24,313
Total	$	45,981	$	18,500	$	37,343	$	101,824
December 31, 2014
Commercial loan portfolio	$	29,179	$	15,271	$	32,597	$	77,047
Consumer loan portfolio	16,485		3,196		4,594		24,275
Total	$	45,664	$	18,467	$	37,191	$	101,322
March 31, 2014
Commercial loan portfolio	$	28,123	$	11,218	$	40,511	$	79,852
Consumer loan portfolio	13,700		6,244		3,875		23,819
Total	$	41,823	$	17,462	$	44,386	$	103,671

The following schedule provides information on the Corporation's TDRs that were modified during the three months ended March 31, 2015 and 2014:

	Number of Loans	Pre- Modification Recorded Investment		Post- Modification Recorded Investment
	(Dollars in thousands)
Three Months Ended March 31, 2015
Commercial loan portfolio:
Commercial	5	$	1,932	$	1,932
Commercial real estate	5	2,534		2,534
Land development	—	—		—
Subtotal – commercial loan portfolio	10	4,466		4,466
Consumer loan portfolio	10	336		336
Total	20	$	4,802	$	4,802

Three Months Ended March 31, 2014
Commercial loan portfolio:
Commercial	12	$	8,356	$	8,356
Commercial real estate	9	2,790		2,790
Real estate construction	—	—		—
Land development	1	72		72
Subtotal – commercial loan portfolio	22	11,218		11,218
Consumer loan portfolio	30	987		978
Total	52	$	12,205	$	12,196

The pre-modification and post-modification recorded investment represents amounts as of the date of loan modification. The difference between the pre-modification and post-modification recorded investment of residential mortgage TDRs represents impairment recognized by the Corporation through the provision for loan losses computed based on a loan's post-modification present value of expected future cash flows discounted at the loan's original effective interest rate.

33

Chemical Financial Corporation

Notes to Consolidated Financial Statements (Unaudited)

March 31, 2015

The following schedule includes TDRs for which there was a payment default during the three months ended March 31, 2015 and 2014, whereby the borrower was past due with respect to principal and/or interest for 90 days or more, and the loan became a TDR during the twelve-month period prior to the default:

	Number of Loans	Principal Balance at End of Period
	(Dollars in thousands)
Three Months Ended March 31, 2015
Commercial loan portfolio:
Commercial	—	$	—
Commercial real estate	3	759
Subtotal – commercial loan portfolio	3	759
Consumer loan portfolio	1	33
Total	4	$	792
Three Months Ended March 31, 2014
Commercial loan portfolio:
Commercial	1	$	104
Commercial real estate	2	1,670
Real estate construction	—	—
Land development	—	—
Subtotal – commercial loan portfolio	3	1,774
Consumer loan portfolio	—	—
Total	3	$	1,774

Allowance for Loan Losses

The following schedule presents, by loan portfolio segment, the changes in the allowance for the three months ended March 31, 2015 and details regarding the balance in the allowance and the recorded investment in loans at March 31, 2015 by impairment evaluation method.

	Commercial Loan Portfolio			Consumer Loan Portfolio			Unallocated		Total
	(In thousands)
Changes in allowance for loan losses for the three months ended March 31, 2015:
Beginning balance	$	44,156		$	28,803		$	2,724	$	75,683
Provision for loan losses	3,593			(3,227		)	1,134		1,500
Charge-offs	(1,504		)	(1,639		)	—		(3,143		)
Recoveries	574			642			—		1,216
Ending balance	$	46,819		$	24,579		$	3,858	$	75,256
Allowance for loan losses balance at March 31, 2015 attributable to:
Loans individually evaluated for impairment	$	1,615		$	297		$	—	$	1,912
Loans collectively evaluated for impairment	45,204			24,282			3,858		73,344
Loans acquired with deteriorated credit quality	—			—			—		—
Total	$	46,819		$	24,579		$	3,858	$	75,256
Recorded investment (loan balance) at March 31, 2015:
Loans individually evaluated for impairment	$	89,217		$	19,887		$	—	$	109,104
Loans collectively evaluated for impairment	2,548,223			2,391,335			—		4,939,558
Loans acquired with deteriorated credit quality	444,491			209,721			—		654,212
Total	$	3,081,931		$	2,620,943		$	—	$	5,702,874

34

Chemical Financial Corporation

Notes to Consolidated Financial Statements (Unaudited)

March 31, 2015

The following schedule presents, by loan portfolio segment, details regarding the balance in the allowance and the recorded investment in loans at December 31, 2014 by impairment evaluation method.

	Commercial Loan Portfolio		Consumer Loan Portfolio		Unallocated		Total
	(In thousands)
Allowance for loan losses balance at December 31, 2014 attributable to:
Loans individually evaluated for impairment	$	1,003	$	335	$	—	$	1,338
Loans collectively evaluated for impairment	43,153		27,968		2,724		73,845
Loans acquired with deteriorated credit quality	—		500		—		500
Total	$	44,156	$	28,803	$	2,724	$	75,683
Recorded investment (loan balance) at December 31, 2014:
Loans individually evaluated for impairment	$	86,221	$	19,681	$	—	$	105,902
Loans collectively evaluated for impairment	2,517,371		2,366,794		—		4,884,165
Loans acquired with deteriorated credit quality	480,432		217,731		—		698,163
Total	$	3,084,024	$	2,604,206	$	—	$	5,688,230

The following schedule presents, by loan portfolio segment, the changes in the allowance for the three months ended March 31, 2014 and details regarding the balance in the allowance and the recorded investment in loans at March 31, 2014 by impairment evaluation method.

	Commercial Loan Portfolio			Consumer Loan Portfolio			Unallocated			Total
	(In thousands)
Changes in allowance for loan losses for the three months ended March 31, 2014:
Beginning balance	$	44,482		$	30,145		$	4,445		$	79,072
Provision for loan losses	960			855			(215		)	1,600
Charge-offs	(1,209		)	(2,263		)	—			(3,472		)
Recoveries	777			496			—			1,273
Ending balance	$	45,010		$	29,233		$	4,230		$	78,473
Allowance for loan losses balance at March 31, 2014 attributable to:
Loans individually evaluated for impairment	$	1,621		$	444		$	—		$	2,065
Loans collectively evaluated for impairment	43,389			28,289			4,230			75,908
Loans acquired with deteriorated credit quality	—			500			—			500
Total	$	45,010		$	29,233		$	4,230		$	78,473
Recorded investment (loan balance) at March 31, 2014:
Loans individually evaluated for impairment	$	87,587		$	19,944		$	—		$	107,531
Loans collectively evaluated for impairment	2,252,423			2,104,511			—			4,356,934
Loans acquired with deteriorated credit quality	246,643			42,181			—			288,824
Total	$	2,586,653		$	2,166,636		$	—		$	4,753,289

The allowance attributable to acquired loans of $0.5 million at December 31, 2014 and March 31, 2014 was primarily attributable to two consumer loan pools in the acquired loan portfolio that had a decline in expected cash flows. There were no material changes in expected cash flows for the remaining acquired loan pools at March 31, 2015, December 31, 2014 or March 31, 2014.

Note 5: Intangible Assets

The Corporation has the following types of intangible assets: goodwill, core deposit intangible assets and mortgage servicing rights (MSRs). Goodwill and core deposit intangible assets arose as a result of business combinations or other acquisitions. MSRs arose as a result of selling residential mortgage loans in the secondary market while retaining the right to service these loans and receive servicing income over the life of the loan. Amortization is recorded on the core deposit intangible assets and MSRs. Goodwill is not amortized but is evaluated at least annually for impairment. The Corporation’s most recent annual goodwill impairment test performed as of October 31, 2014 did not indicate that an impairment of goodwill existed. The Corporation also

35

Chemical Financial Corporation

Notes to Consolidated Financial Statements (Unaudited)

March 31, 2015

determined that no triggering events have occurred that indicated impairment from the most recent valuation date through March 31, 2015 and that the Corporation's goodwill was not impaired at March 31, 2015.

The following table shows the net carrying value of the Corporation’s intangible assets:

	March 31, 2015		December 31, 2014		March 31, 2014
	(In thousands)
Goodwill	$	180,128	$	180,128	$	120,164
Other intangible assets:
Core deposit intangible assets	$	20,072	$	20,863	$	9,556
Mortgage servicing rights	11,583		12,217		3,316
Total other intangible assets	$	31,655	$	33,080	$	12,872

The following table sets forth the carrying amount, accumulated amortization and amortization expense of core deposit intangible assets that are amortizable and arose from business combinations or other acquisitions:

	March 31, 2015		December 31, 2014		March 31, 2014
	(In thousands)
Gross original amount	$	30,122	$	31,550	$	18,659
Accumulated amortization	10,050		10,687		9,103
Carrying amount	$	20,072	$	20,863	$	9,556
Amortization expense for the three months ended March 31	$	791			$	445

The estimated future amortization expense on core deposit intangible assets for periods ending after March 31, 2015 is as follows: 2015 — $2.4 million; 2016 — $2.9 million; 2017 — $2.6 million; 2018 — $2.5 million; 2019 — $2.4 million; 2020 and thereafter — $7.2 million.

The following shows the net carrying value and fair value of MSRs and the total loans that the Corporation is servicing for others:

	March 31, 2015		December 31, 2014		March 31, 2014
	(In thousands)
Net carrying value of MSRs	$	11,583	$	12,217	$	3,316
Fair value of MSRs	$	14,378	$	14,979	$	6,706
Loans serviced for others that have servicing rights capitalized	$	2,062,544	$	2,093,140	$	877,530

The following table shows the activity for capitalized MSRs:

	Three Months Ended March 31,
	2015			2014
	(In thousands)
Balance at beginning of period	$	12,217		$	3,423
Additions	400			143
Amortization	(1,034		)	(250		)
Balance at end of period	$	11,583		$	3,316

MSRs are stratified into servicing assets originated by the Corporation and those acquired in acquisitions of other institutions and further stratified into relatively homogeneous pools based on products with similar characteristics. There was a valuation allowance of $0.2 million as of March 31, 2015 and December 31, 2014 related to impairment within certain pools attributable to the Corporation's servicing portfolio that was acquired in the Northwestern transaction. There was no impairment valuation allowance recorded on the Corporation's MSRs at March 31, 2014.

36

Chemical Financial Corporation

Notes to Consolidated Financial Statements (Unaudited)

March 31, 2015

Note 6: Accumulated Other Comprehensive Loss

The components of accumulated other comprehensive loss, net of related tax benefit/expense, were as follows:

	March 31, 2015			December 31, 2014			March 31, 2014
	(In thousands)
Net unrealized gains (losses) on investment securities – available-for-sale, net of related tax expense (benefit) of $946 at March 31, 2015, $(113) at December 31, 2014 and $(478) at March 31, 2014	$	1,758		$	(210	)	$	(887	)
Pension and other postretirement benefits adjustment, net of related tax benefit of $16,981 at March 31, 2015, $17,362 at December 31, 2014 and $9,915 at March 31, 2014	(31,537		)	(32,243		)	(18,414		)
Accumulated other comprehensive loss	$	(29,779	)	$	(32,453	)	$	(19,301	)

Note 7: Regulatory Capital

Federal and state banking regulations place certain restrictions on the transfer of assets, in the form of dividends, loans, or advances, from Chemical Bank to the Corporation. As of March 31, 2015, substantially all of the assets of Chemical Bank were restricted from transfer to the Corporation in the form of loans or advances. Dividends from Chemical Bank are the principal source of funds for the Corporation. At March 31, 2015, Chemical Bank was "well-capitalized" as defined by federal banking regulations. In addition to the statutory limits, the Corporation considers the overall financial and capital position of Chemical Bank prior to making any cash dividend decisions.

The Corporation and Chemical Bank are subject to various regulatory capital requirements administered by federal banking agencies. Under these capital requirements, Chemical Bank must meet specific capital guidelines that involve quantitative measures of assets and certain off-balance sheet items as calculated under regulatory accounting practices. In addition, capital amounts and classifications are subject to qualitative judgments by regulators. Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Corporation’s consolidated financial statements.

Quantitative measures established by regulation to ensure capital adequacy require minimum ratios of Tier 1 capital to average assets (Leverage Ratio) and common equity Tier 1, Tier 1 and Total capital to risk-weighted assets. These capital guidelines assign risk weights to on- and off-balance sheet items in arriving at total risk-weighted assets. Minimum capital levels are based upon the perceived risk of various asset categories and certain off-balance sheet instruments. Risk weighted assets of the Corporation totaled $5.58 billion, $5.70 billion and $4.76 billion at March 31, 2015, December 31, 2014 and March 31, 2014, respectively.

In July 2013, the Federal Reserve Board and FDIC approved final rules implementing the Basel Committee on Banking Supervision's (BCBS) capital guidelines for U.S. banks. The final rules, which are subject to a multi-year phase-in period, began for the Corporation and Chemical Bank on January 1, 2015. The final rules include a new minimum common equity Tier 1 capital to risk-weighted assets (CET) ratio of 4.5%, in addition to raising the minimum ratio of Tier 1 capital to risk-weighted assets from 4.0% to 6.0% and requiring a minimum leverage ratio of 4.0%. The final rules also establish a new capital conservation buffer of 2.5% of risk-weighted assets, which is phased-in over a four-year period beginning January 1, 2016.

At March 31, 2015, December 31, 2014 and March 31, 2014, Chemical Bank’s capital ratios exceeded the quantitative capital ratios required for an institution to be considered “well-capitalized.” Significant factors that may affect capital adequacy include, but are not limited to, a disproportionate growth in assets versus capital and a change in mix or credit quality of assets.

37

Chemical Financial Corporation

Notes to Consolidated Financial Statements (Unaudited)

March 31, 2015

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

Note 8: Fair Value Measurements

Fair value, as defined by GAAP, is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. A fair value measurement assumes that the transaction to sell the asset or transfer the liability occurs in the principal market for the asset or liability or, in the absence of a principal market, the most advantageous market for the asset or liability. The price in the principal (or most advantageous) market used to measure the fair value of the asset or liability is not adjusted for transaction costs. An orderly transaction is a transaction that assumes exposure to the market for a period prior to the measurement date to allow for market activities that are usual and customary for transactions involving such assets and liabilities; it is not a forced transaction. Market participants are buyers and sellers in the principal market that are (i) independent, (ii) knowledgeable, (iii) able to transact and (iv) willing to transact.

38

Chemical Financial Corporation

Notes to Consolidated Financial Statements (Unaudited)

March 31, 2015

The Corporation utilizes fair value measurements to record fair value adjustments to certain assets and to determine fair value disclosures. Investment securities — available-for-sale and loans held-for-sale are recorded at fair value on a recurring basis. Additionally, the Corporation may be required to record other assets, such as impaired loans, goodwill, other intangible assets, other real estate and repossessed assets, at fair value on a nonrecurring basis. These nonrecurring fair value adjustments typically involve the application of lower of cost or market accounting or write-downs of individual assets.

The Corporation determines the fair value of its financial instruments based on a three-level hierarchy established by GAAP. The classification and disclosure of assets and liabilities within the hierarchy is based on whether the inputs to the valuation methodology used for measurement are observable or unobservable. Observable inputs reflect market-derived or market-based information obtained from independent sources, while unobservable inputs reflect management’s estimates about market data. The three levels of inputs that may be used to measure fair value within the GAAP hierarchy are as follows:

Level 1 Valuation is based upon quoted prices for identical instruments traded in active markets. Level 1 valuations for the Corporation would include U.S. Treasury securities that are traded by dealers or brokers in active over-the-counter markets. Valuations are obtained from a third-party pricing service for these investment securities.

Level 2 Valuation is based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant assumptions are observable in the market. Level 2 valuations for the Corporation include government sponsored agency securities, including securities issued by the Federal Home Loan Bank, Federal Home Loan Mortgage Corporation, Federal National Mortgage Association, Federal Farm Credit Bank, Student Loan Marketing Corporation and the Small Business Administration, securities issued by certain state and political subdivisions, residential mortgage-backed securities, collateralized mortgage obligations, corporate bonds and preferred stock. Valuations are obtained from a third-party pricing service for these investment securities.

Level 3 Valuation is generated from model-based techniques that use at least one significant assumption not observable in the market. These unobservable assumptions reflect estimates of assumptions that market participants would use in pricing the asset or liability. Valuation techniques include use of option pricing models, discounted cash flow models, yield curves and similar techniques. The determination of fair value requires management judgment or estimation and generally is corroborated by external data, which includes third-party pricing services. Level 3 valuations for the Corporation include securities issued by certain state and political subdivisions, trust preferred investment securities, impaired loans, goodwill, core deposit intangible assets, MSRs and other real estate and repossessed assets.

A description of the valuation methodologies used for instruments measured at fair value, as well as the general classification of such instruments pursuant to the valuation hierarchy, is set forth below. These valuation methodologies were applied to all of the Corporation’s financial assets and financial liabilities carried at fair value and all financial instruments disclosed at fair value. In general, fair value is based upon quoted market prices, where available. If quoted market prices are not available, fair value is based upon third-party pricing services when available. Fair value may also be based on internally developed models that primarily use, as inputs, observable market-based parameters. Valuation adjustments may be required to record financial instruments at fair value. Any such valuation adjustments are applied consistently over time. The Corporation’s valuation methodologies may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values.

While management believes the Corporation’s valuation methodologies are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different estimate of fair value at the reporting date. Furthermore, the fair value amounts may change significantly after the date of the statement of financial position from the amounts reported in the consolidated financial statements and related notes.

Assets and Liabilities Recorded at Fair Value on a Recurring Basis

Investment securities — available-for-sale are recorded at fair value on a recurring basis. Fair value measurement is based upon quoted prices, if available. If quoted prices are not available, fair values are generally measured using independent pricing models or other model-based valuation techniques that include market inputs, such as benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers, reference data and industry and economic events.

The Corporation elected the fair value option for all residential mortgage loans held-for-sale originated on or after July 1, 2012. Accordingly, loans held-for-sale are recorded at fair value on a recurring basis. The fair values of loans held-for-sale are based on the market price for similar loans sold in the secondary market, and therefore, are classified as Level 2 valuations.

39

Chemical Financial Corporation

Notes to Consolidated Financial Statements (Unaudited)

March 31, 2015

Disclosure of Recurring Basis Fair Value Measurements

For assets measured at fair value on a recurring basis, quantitative disclosures about the fair value measurements for each major category of assets were as follows:

	Fair Value Measurements – Recurring Basis
	Quoted Prices In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(In thousands)
March 31, 2015
Investment securities – available-for-sale:
U.S. Treasury securities	$	8,302	$	—	$	—	$	8,302
Government sponsored agencies	—		250,430		—		250,430
State and political subdivisions	—		32,322		—		32,322
Residential mortgage-backed securities	—		219,601		—		219,601
Collateralized mortgage obligations	—		133,300		—		133,300
Corporate bonds	—		34,997		—		34,997
Preferred stock	—		1,692		—		1,692
Total investment securities – available-for-sale	8,302		672,342		—		680,644
Loans held-for-sale	—		9,675		—		9,675
Total assets measured at fair value on a recurring basis	$	8,302	$	682,017	$	—	$	690,319
December 31, 2014
Investment securities – available-for-sale:
U.S. Treasury securities	$	8,259	$	—	$	—	$	8,259
Government sponsored agencies	—		263,503		—		263,503
State and political subdivisions	—		46,227		—		46,227
Residential mortgage-backed securities	—		239,807		—		239,807
Collateralized mortgage obligations	—		144,383		—		144,383
Corporate bonds	—		45,095		—		45,095
Preferred stock	—		1,590		—		1,590
Total investment securities – available-for-sale	8,259		740,605		—		748,864
Loans held-for-sale	—		9,128		—		9,128
Total assets measured at fair value on a recurring basis	$	8,259	$	749,733	$	—	$	757,992
March 31, 2014
Investment securities – available-for-sale:
Government sponsored agencies	$	—	$	91,610	$	—	$	91,610
State and political subdivisions	—		43,777		—		43,777
Residential mortgage-backed securities	—		288,738		—		288,738
Collateralized mortgage obligations	—		166,719		—		166,719
Corporate bonds	—		65,415		—		65,415
Preferred stock	—		1,559		—		1,559
Total investment securities – available-for-sale	—		657,818		—		657,818
Loans held-for-sale	—		3,814		—		3,814
Total assets measured at fair value on a recurring basis	$	—	$	661,632	$	—	$	661,632

There were no liabilities recorded at fair value on a recurring basis at March 31, 2015, December 31, 2014 or March 31, 2014.

40

Chemical Financial Corporation

Notes to Consolidated Financial Statements (Unaudited)

March 31, 2015

Assets and Liabilities Recorded at Fair Value on a Nonrecurring Basis

The Corporation does not record loans held for investment at fair value on a recurring basis. However, from time to time, a loan is considered impaired and an allocation of the allowance (valuation allowance) may be established or a portion of the loan is charged off. Loans for which it is probable that payment of interest and principal will not be made in accordance with the contractual terms of the loan agreement are considered impaired. The fair value of impaired loans is estimated using one of several methods, including the loan’s observable market price, the fair value of the collateral or the present value of the expected future cash flows discounted at the loan’s effective interest rate. Those impaired loans not requiring a valuation allowance represent loans for which the fair value of the expected repayments or collateral exceed the remaining carrying amount of such loans. Impaired loans where a valuation allowance is established or a portion of the loan is charged off based on the fair value of collateral are subject to nonrecurring fair value measurement and require classification in the fair value hierarchy. The Corporation records impaired loans as Level 3 valuations as there is generally no observable market price or independent appraised value, or management determines the fair value of the collateral is further impaired below the appraised value. When management determines the fair value of the collateral is further impaired below appraised value, discount factors ranging between 70% and 80% of the appraised value are used depending on the nature of the collateral and the age of the most recent appraisal.

Goodwill is subject to impairment testing on an annual basis. The assessment of goodwill for impairment requires a significant degree of judgment. In the event the assessment indicates that it is more-likely-than-not that the fair value is less than the carrying value, the asset is considered impaired and recorded at fair value. Goodwill that is impaired and subject to nonrecurring fair value measurements is a Level 3 valuation. At March 31, 2015, December 31, 2014 and March 31, 2014, no goodwill was impaired, and therefore, goodwill was not recorded at fair value on a nonrecurring basis.

Other intangible assets consist of core deposit intangible assets and MSRs. These items are both recorded at fair value when initially recorded. Subsequently, core deposit intangible assets are amortized primarily on an accelerated basis over periods ranging from ten to fifteen years and are subject to impairment testing whenever events or changes in circumstances indicate that the carrying amount exceeds the fair value of the asset. If core deposit intangible asset impairment is identified, the Corporation classifies impaired core deposit intangible assets subject to nonrecurring fair value measurements as Level 3 valuations. At March 31, 2015, December 31, 2014 and March 31, 2014, there was no impairment identified for core deposit intangible assets. The fair value of MSRs is initially estimated using a model that calculates the net present value of estimated future cash flows using various assumptions, including prepayment speeds, the discount rate and servicing costs. If the valuation model reflects a value less than the carrying value, MSRs are adjusted to fair value, as determined by the model, through a valuation allowance. The Corporation classifies MSRs subject to nonrecurring fair value measurements as Level 3 valuations. At March 31, 2015 and December 31, 2014, the Corporation recognized a valuation allowance of $0.2 million related to impairment within certain pools attributable to the Corporation's servicing portfolio that was acquired in the Northwestern transaction. At March 31, 2014, there was no impairment identified for MSRs and, therefore, no other intangible assets were recorded at fair value on a nonrecurring basis at that date.

The carrying amounts for other real estate (ORE) and repossessed assets (RA) are reported in the consolidated statements of financial position under “Interest receivable and other assets.” ORE and RA include real estate and other types of assets repossessed by the Corporation. ORE and RA are recorded at the lower of cost or fair value upon the transfer of a loan to ORE or RA and, subsequently, ORE and RA continue to be measured and carried at the lower of cost or fair value. Fair value is based upon independent market prices, appraised values of the property or management’s estimation of the value of the property. The Corporation records ORE and RA as Level 3 valuations as management generally determines that the fair value of the property is impaired below the appraised value. When management determines the fair value of the property is further impaired below appraised value, discount factors ranging between 70% and 75% of the appraised value are used depending on the nature of the property and the age of the most recent appraisal.

41

Chemical Financial Corporation

Notes to Consolidated Financial Statements (Unaudited)

March 31, 2015

Disclosure of Nonrecurring Basis Fair Value Measurements

For assets measured at fair value on a nonrecurring basis, quantitative disclosures about fair value measurements for each major category of assets were as follows:

	Fair Value Measurements – Nonrecurring Basis
	Quoted Prices In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(In thousands)
March 31, 2015
Impaired originated loans	$	—	$	—	$	23,730	$	23,730
Other real estate/repossessed assets	—		—		14,744		14,744
Mortgage servicing rights	—		—		8,115		8,115
Total	$	—	$	—	$	46,589	$	46,589
December 31, 2014
Impaired originated loans	$	—	$	—	$	21,323	$	21,323
Other real estate/repossessed assets	—		—		14,205		14,205
Mortgage servicing rights	—		—		8,691		8,691
Total	$	—	$	—	$	44,219	$	44,219
March 31, 2014
Impaired originated loans	$	—	$	—	$	29,461	$	29,461
Other real estate/repossessed assets	—		—		10,056		10,056
Total	$	—	$	—	$	39,517	$	39,517

There were no liabilities recorded at fair value on a nonrecurring basis at March 31, 2015, December 31, 2014 and March 31, 2014.

Disclosures about Fair Value of Financial Instruments

GAAP requires disclosures about the estimated fair value of the Corporation's financial instruments, including those financial assets and liabilities that are not measured and reported at fair value on a recurring or nonrecurring basis. However, the method of estimating fair value for certain financial instruments, such as loans, that are not required to be measured on a recurring or nonrecurring basis, as prescribed by ASC 820, Fair Value Measurements and Disclosures, does not incorporate the exit-price concept of fair value. The Corporation utilized the fair value hierarchy in computing the fair values of its financial instruments. In cases where quoted market prices were not available, the Corporation employed present value methods using unobservable inputs requiring management's judgment to estimate the fair values of its financial instruments, which are considered Level 3 valuations. These Level 3 valuations are affected by the assumptions made and, accordingly, do not necessarily indicate amounts that could be realized in a current market exchange. It is also the Corporation's general practice and intent to hold the majority of its financial instruments until maturity and, therefore, the Corporation does not expect to realize the estimated amounts disclosed.

The methodologies for estimating the fair value of financial assets and financial liabilities on a recurring or nonrecurring basis are discussed above. At March 31, 2015, December 31, 2014 and March 31, 2014, the estimated fair values of cash and cash equivalents, interest receivable and interest payable approximated their carrying values at those dates. The methodologies for other financial assets and financial liabilities follow.

Fair value measurement for investment securities — held-to-maturity is based upon quoted prices, if available. If quoted prices are not available, fair values are measured using independent pricing models or other model-based valuation techniques that include market inputs such as benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers, reference data and industry and economic events. Fair value measurements using Level 2 valuations of investment securities — held-to-maturity include the majority of the Corporation's investment securities issued by state and political subdivisions. Level 3 valuations include certain securities issued by state and political subdivisions and trust preferred investment securities.

42

Chemical Financial Corporation

Notes to Consolidated Financial Statements (Unaudited)

March 31, 2015

Fair value measurements of nonmarketable equity securities, which consisted of Federal Home Loan Bank (FHLB) and Federal Reserve Bank (FRB) stock, are based on their redeemable value, which is cost. The market for these securities is restricted to the issuer of the stock and subject to impairment evaluation. It is not practicable to determine the fair value of these securities within the fair value hierarchy due to the restrictions placed on their transferability.

Loans held-for-sale are carried at fair value, as the Corporation elected the fair value option on these loans. The fair values of loans held-for-sale are based on the market price for similar loans sold in the secondary market, and therefore, are classified as Level 2 valuations.

The fair value of variable interest rate loans that reprice regularly with changes in market interest rates are based on carrying values. The fair values for fixed interest rate loans are estimated using discounted cash flow analyses, using the Corporation’s interest rates currently being offered for loans with similar terms to borrowers of similar credit quality. The resulting fair value amounts are adjusted to estimate the impact of changes in the credit quality of borrowers after the loans were originated. The fair value measurements for loans are Level 3 valuations.

The fair values of deposit accounts without defined maturities, such as interest- and noninterest-bearing checking, savings and money market accounts, are equal to the amounts payable on demand. Fair value measurements for fixed-interest rate time deposits with defined maturities are based on the discounted value of contractual cash flows, using the Corporation’s interest rates currently being offered for deposits of similar maturities, and are Level 3 valuations. The fair values for variable-interest rate time deposits with defined maturities approximate their carrying amounts.

Short-term borrowings consist of securities sold under agreements to repurchase, short-term FHLB advances and federal funds purchased. Fair value measurements for short-term borrowings are based on the present value of future estimated cash flows using current interest rates offered to the Corporation for debt with similar terms and are Level 2 valuations.

Fair value measurements for long-term FHLB advances are estimated based on the present value of future estimated cash flows using current interest rates offered to the Corporation for debt with similar terms and are Level 2 valuations.

The Corporation’s unused commitments to extend credit, standby letters of credit and loan commitments have no carrying amount and have been estimated to have no realizable fair value. Historically, a majority of the unused commitments to extend credit have not been drawn upon and, generally, the Corporation does not receive fees in connection with these commitments other than standby letter of credit fees, which are not significant.

Fair value measurements have not been made for items that are not defined by GAAP as financial instruments, including such items as the value of the Corporation’s Wealth Management department and the value of the Corporation’s core deposit base. The Corporation believes it is impractical to estimate a representative fair value for these types of assets, even though management believes they add significant value to the Corporation.

43

Chemical Financial Corporation

Notes to Consolidated Financial Statements (Unaudited)

March 31, 2015

A summary of carrying amounts and estimated fair values of the Corporation’s financial instruments included in the consolidated statements of financial position was as follows:

	Level in Fair Value Measurement Hierarchy	March 31, 2015				December 31, 2014				March 31, 2014
		Carrying Amount		Fair Value		Carrying Amount		Fair Value		Carrying Amount		Fair Value
		(In thousands)
Assets:
Cash and cash equivalents	Level 1	$	393,938	$	393,938	$	183,020	$	183,020	$	382,385	$	382,385
Investment securities:
Available-for-sale	Level 1	8,302		8,302		8,259		8,259		—		—
Available-for-sale	Level 2	672,342		672,342		740,605		740,605		657,818		657,818
Held-to-maturity	Level 2	370,950		372,876		305,913		308,650		267,599		265,947
Held-to-maturity	Level 3	10,500		7,300		10,500		7,090		10,500		6,460
Nonmarketable equity securities	NA	31,249		31,249		27,369		27,369		25,572		25,572
Loans held-for-sale	Level 2	9,675		9,675		9,128		9,128		3,814		3,814
Net loans	Level 3	5,627,618		5,633,217		5,612,547		5,623,454		4,674,816		4,688,814
Interest receivable	Level 2	19,816		19,816		17,492		17,492		16,945		16,945
Liabilities:
Deposits without defined maturities	Level 2	$	4,988,268	$	4,988,268	$	4,741,024	$	4,741,024	$	3,868,700	$	3,868,700
Time deposits	Level 3	1,332,085		1,335,605		1,337,947		1,340,015		1,362,593		1,371,312
Interest payable	Level 2	779		779		755		755		876		876
Short-term borrowings	Level 2	372,236		372,236		389,467		389,467		361,231		361,231

Note 9: Earnings Per Common Share

Basic earnings per common share for the Corporation is computed by dividing net income by the weighted average number of common shares outstanding during the period. Basic earnings per common share excludes any dilutive effect of common stock equivalents.

Diluted earnings per common share for the Corporation is computed by dividing net income by the sum of the weighted average number of common shares outstanding and the dilutive effect of common stock equivalents using the treasury stock method. Average shares of common stock for diluted net income per common share include shares to be issued upon the exercise of stock options granted under the Corporation’s share-based compensation plans, restricted stock units that may be converted to stock, stock to be issued under the deferred stock compensation plan for non-employee directors and stock to be issued under the stock purchase plan for non-employee advisory directors. For any period in which a net loss is recorded, the assumed exercise of stock options, restricted stock units that may be converted to stock and stock to be issued under the deferred stock compensation plan and the stock purchase plan would have an anti-dilutive impact on the net loss per common share and thus are excluded in the diluted earnings per common share calculation.

The following summarizes the numerator and denominator of the basic and diluted earnings per common share computations:

	Three Months Ended March 31,
	2015		2014
	(In thousands, except per share data)
Numerator for both basic and diluted earnings per common share, net income	$	17,835	$	13,813
Denominator for basic earnings per common share, weighted average common shares outstanding	32,809		29,825
Weighted average common stock equivalents	235		212
Denominator for diluted earnings per common share	33,044		30,037
Basic earnings per common share	$	0.54	$	0.46
Diluted earnings per common share	0.54		0.46

44

Chemical Financial Corporation

Notes to Consolidated Financial Statements (Unaudited)

March 31, 2015

The average number of exercisable employee stock option awards outstanding that were “out-of-the-money,” whereby the option exercise price per share exceeded the market price per share and, therefore, were not included in the computation of diluted earnings per common share because they would have been anti-dilutive totaled 121,050 and 259,288 for the three months ended March 31, 2015 and 2014, respectively.

Note 10: Share-Based Compensation

The Corporation maintains a share-based compensation plan under which it periodically grants share-based awards for a fixed number of shares to certain officers of the Corporation. The fair value of share-based awards is recognized as compensation expense over the requisite service or performance period. During the three-month periods ended March 31, 2015 and 2014, share-based compensation expense related to stock options, restricted stock units and other share-based awards totaled $0.8 million and $0.6 million, respectively.

During the three-month period ended March 31, 2015, the Corporation granted options to purchase 244,165 shares of common stock and 76,286 restricted stock units to certain officers. At March 31, 2015, there were 32,953 shares of common stock available for future grants under the share-based compensation plan. On April 20, 2015, the shareholders of the Corporation approved the Stock Incentive Plan of 2015, which provides for 1,300,000 shares of the Corporation's common stock to be made available for future equity-based awards and cancels the amount of shares available for future grant under prior share-based compensation plans.

Stock Options

The Corporation issues stock options to certain officers. Stock options are issued at the current market price of the Corporation's common stock on the date of grant and expire ten years from the date of grant. Stock options granted after 2012 vest ratably over a five-year period. Stock options granted prior to 2013 generally vest ratably over a three-year period.

A summary of activity for the Corporation’s stock options as of and for the three months ended March 31, 2015 is presented below:

	Non-Vested Stock Options Outstanding						Stock Options Outstanding
	Number of Options		Weighted- Average Exercise Price Per Share		Weighted- Average Grant Date Fair Value Per Share		Number of Options		Weighted- Average Exercise Price Per Share
Outstanding at December 31, 2014	432,199		$	26.75	$	8.30	1,037,311		$	25.90
Granted	244,165		30.18		8.40		244,165		30.18
Exercised	—		—		—		(37,191	)	23.11
Vested	(150,224	)	25.57		7.80		—		—
Forfeited/expired	(3,049	)	27.42		8.59		(3,049	)	27.42
Outstanding at March 31, 2015	523,091		$	28.69	$	8.49	1,241,236		$	26.82
Exercisable/vested at March 31, 2015							718,145		$	25.46

The weighted-average remaining contractual terms were 6.6 years for all outstanding stock options and 4.7 years for exercisable stock options at March 31, 2015. The intrinsic value of all outstanding in-the-money stock options and exercisable in-the-money stock options was $5.7 million and $4.4 million, respectively, at March 31, 2015. The aggregate intrinsic values of outstanding and exercisable options at March 31, 2015 were calculated based on the closing market price of the Corporation’s common stock on March 31, 2015 of $31.36 per share less the exercise price. Options with intrinsic values less than zero, or “out-of-the-money” options, were not included in the aggregate intrinsic value reported.

At March 31, 2015, unrecognized compensation expense related to stock options totaled $4.4 million and is expected to be recognized over a remaining weighted average period of 4.2 years.

45

Chemical Financial Corporation

Notes to Consolidated Financial Statements (Unaudited)

March 31, 2015

The fair value of the stock options granted during the three months ended March 31, 2015 was estimated on the date of grant using the Black-Scholes option pricing model with the following assumptions.

Expected dividend yield	3.50		%
Risk-free interest rate	1.78		%
Expected stock price volatility	39.1		%
Expected life of options – in years	7.0
Weighted average fair value of options granted	$	8.40

Restricted Stock Units

In addition to stock options, the Corporation grants restricted stock performance units and restricted stock service-based units (collectively referred to as restricted stock units) to certain officers. The restricted stock performance units vest based on the Corporation achieving certain performance target levels. The restricted stock performance units are eligible to vest from 0.25x to 1.5x the number of units originally granted depending on which, if any, of the performance target levels are met. However, if the minimum performance target level is not achieved, no shares will become vested or be issued for that respective year’s restricted stock performance units. The restricted stock service-based units vest upon satisfaction of a service condition. Upon achievement of the performance target level and/or satisfaction of a service condition, if applicable, the restricted stock units are converted into shares of the Corporation’s common stock on a one-to-one basis. Compensation expense related to restricted stock units is recognized over the expected requisite performance or service period, as applicable.

A summary of the activity for restricted stock units as of and for the three months ended March 31, 2015 is presented below:

	Number of Units		Weighted- Average Grant Date Fair Value  Per Unit
Outstanding at December 31, 2014	204,319		$	24.14
Granted	76,286		28.15
Converted into shares of common stock	(66,769	)	22.32
Forfeited/expired	(405	)	25.17
Outstanding at March 31, 2015	213,431		$	26.14

At March 31, 2015, unrecognized compensation expense related to restricted stock unit awards totaled $4.1 million and is expected to be recognized over a remaining weighted average period of 3.0 years.

Note 11: Pension and Other Postretirement Benefit Plans

The components of net periodic benefit cost for the Corporation’s qualified and nonqualified pension plans and nonqualified postretirement benefit plan are as follows:

	Three Months Ended March 31,
	2015			2014
	(In thousands)
Defined Benefit Pension Plans
Service cost	$	273		$	250
Interest cost	1,332			1,312
Expected return on plan assets	(2,161		)	(2,078		)
Amortization of prior service credit	(1		)	—
Amortization of unrecognized net loss	1,056			569
Net periodic benefit cost	$	499		$	53
Postretirement Benefit Plan
Service cost	$	4		$	5
Interest cost	33			35
Amortization of prior service cost	32			32
Amortization of unrecognized net gain	—			(26		)
Net periodic benefit cost	$	69		$	46

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Chemical Financial Corporation

Notes to Consolidated Financial Statements (Unaudited)

March 31, 2015

The Corporation’s pension plan does not have a contribution requirement in 2015. The Corporation did not make a contribution to the pension plan during 2014. The discount rate used to compute the Corporation's pension plan expense for 2015 is 4.15%.

401(k) Savings Plan expense for the Corporation’s match of participants’ base compensation contributions and a 4% of eligible pay contribution to certain employees who are not grandfathered under the pension plan was $1.1 million and $0.8 million for the three months ended March 31, 2015 and 2014, respectively.

Note 12: Financial Guarantees

In the normal course of business, the Corporation is a party to financial instruments containing credit risk that are not required to be reflected in the consolidated statements of financial position. For the Corporation, these financial instruments are financial and performance standby letters of credit. The Corporation has risk management policies to identify, monitor and limit exposure to credit risk. To mitigate credit risk for these financial guarantees, the Corporation generally determines the need for specific covenant, guarantee and collateral requirements on a case-by-case basis, depending on the nature of the financial instrument and the customer’s creditworthiness. At March 31, 2015, December 31, 2014 and March 31, 2014, the Corporation had $38 million, $41 million and $45 million, respectively, of outstanding financial and performance standby letters of credit that expire in five years or less. The majority of these standby letters of credit are collateralized. The Corporation determined that there were no potential losses from standby letters of credit at March 31, 2015, December 31, 2014 and March 31, 2014.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

The following is management's discussion and analysis of certain significant factors that have affected the financial condition and results of operations of Chemical Financial Corporation (Corporation) during the periods included in the consolidated financial statements included in this report.

Critical Accounting Policies

The Corporation's consolidated financial statements are prepared in accordance with United States generally accepted accounting principles (GAAP), Securities and Exchange Commission (SEC) rules and interpretive releases and general practices within the industry in which the Corporation operates. Application of these principles requires management to make estimates, assumptions and complex judgments that affect the amounts reported in the consolidated financial statements and accompanying notes. These estimates, assumptions and judgments are based on information available as of the date of the financial statements; accordingly, as this information changes, the consolidated financial statements could reflect different estimates, assumptions and judgments. Actual results could differ significantly from those estimates. Certain policies inherently have a greater reliance on the use of estimates, assumptions and judgments and, as such, have a greater possibility of producing results that could be materially different than originally reported. Management has identified the determination of the allowance for loan losses, accounting for business combinations (including acquired loans), pension plan accounting, income and other taxes, fair value measurements and the evaluation of goodwill impairment to be the accounting areas that require the most subjective or complex judgments and, as such, could be most subject to revision as new or additional information becomes available or circumstances change, including overall changes in the economic climate and/or market interest rates. Therefore, management considers them to be critical accounting policies and discusses them directly with the Audit Committee of the board of directors. The Corporation's significant accounting policies are more fully described in Note 1 to the audited consolidated financial statements contained in the Corporation's Annual Report on Form 10-K for the year ended December 31, 2014 and the more significant assumptions and estimates made by management are more fully described in “Management's Discussion and Analysis of Financial Condition and Results of Operations - Critical Accounting Policies” in the Corporation's Annual Report on Form 10-K for the year ended December 31, 2014. There were no material changes to the Corporation's significant accounting policies or the estimates made pursuant to those policies during the most recent quarter.

Non-GAAP Financial Measures

This report contains references to financial measures which are not defined in GAAP. Such non-GAAP financial measures include the Corporation's tangible equity to assets ratio, presentation of net interest income and net interest margin on a fully taxable equivalent (FTE) basis and information presented excluding nonrecurring transaction-related expenses, including net income, diluted earnings per share, return on average assets, return on average shareholders' equity and operating expenses. These non-GAAP financial measures have been included as the Corporation believes they are helpful for investors to analyze and evaluate the Corporation's financial condition.

Acquisitions

Pending Acquisition of Lake Michigan Financial Corporation

On January 5, 2015, the Corporation entered into an Agreement and Plan of Merger with Lake Michigan Financial Corporation (Lake Michigan). Under the terms of the merger agreement, each Lake Michigan shareholder will receive $16.64 in cash and 1.326 shares of the Corporation's common stock for each share of Lake Michigan common stock. Based on the 30-day volume weighted price per share of the Corporation's common stock as of January 5, 2015, the merger has a transaction value of approximately $184.1 million. The merger has received regulatory approval. Completion of the merger is subject to the approval of Lake Michigan's shareholders, in addition to satisfaction of other customary closing conditions.

Acquisition of Monarch Community Bancorp, Inc.

On April 1, 2015, the Corporation acquired all of the outstanding stock of Monarch Community Bancorp, Inc. (Monarch) in an all-stock transaction valued at $27.2 million. As a result of the acquisition, the Corporation issued approximately 861,000 shares of its common stock based on an exchange ratio of 0.0982 shares of its common stock for each share of Monarch common stock outstanding. Monarch, a bank holding company, owned Monarch Community Bank, which operates five full service branch offices in Coldwater, Marshall, Hillsdale and Union City, Michigan. Monarch Community Bank will be operated as a separate subsidiary of the Corporation until its planned consolidation with and into Chemical Bank in May 2015. At March 31, 2015, Monarch had total assets of $170 million, total loans of $128 million and total deposits of $143 million.

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Acquisition of Northwestern Bancorp, Inc.

On October 31, 2014, the Corporation acquired all of the outstanding stock of Northwestern Bancorp, Inc. (Northwestern) for total cash consideration of $121 million. Northwestern, a bank holding company which owned Northwestern Bank, provided traditional banking services and products through 25 banking offices serving communities in the northwestern lower peninsula of Michigan. As of the October 31, 2014 acquisition date, Northwestern added total assets of $815 million, including total loans of $475 million, and total deposits of $794 million to the Corporation. Northwestern Bank was consolidated with and into Chemical Bank as of the acquisition date and the Corporation consolidated four branches in communities where Chemical Bank and Northwestern had overlapping branches. In connection with the acquisition of Northwestern, the Corporation recorded $60.0 million of goodwill, which was primarily attributable to the synergies and economies of scale expected from combining the operations of the Corporation and Northwestern. In addition, the Corporation recorded $12.9 million of core deposit intangible assets in conjunction with the acquisition.

Acquisition of 21 Branches

On December 7, 2012, Chemical Bank acquired 21 branches from Independent Bank, a subsidiary of Independent Bank Corporation, located in the Northeast and Battle Creek regions of Michigan, including $404 million in deposits and $44 million in loans (branch acquisition transaction). The Corporation paid a premium on deposits of $11.5 million, or approximately 2.85% of total deposits acquired and the loans were purchased at a discount of 1.75%. In connection with the branch acquisition transaction, the Corporation recorded goodwill of $6.8 million, which represented the excess of the purchase price over the fair value of identifiable net assets acquired, and other intangible assets attributable to customer core deposits of $5.6 million.

Acquisition of O.A.K. Financial Corporation

On April 30, 2010, the Corporation acquired O.A.K. Financial Corporation (OAK) and OAK's wholly-owned bank subsidiary, Byron Bank, in an all-stock transaction for total consideration of $83.7 million. Byron Bank, which was subsequently consolidated with and into Chemical Bank, provided traditional banking services and products through 14 banking offices serving communities in Ottawa, Allegan and Kent counties in west Michigan. At April 30, 2010, OAK had total assets of $820 million, including total loans of $627 million, and total deposits of $693 million, including brokered deposits of $193 million. In connection with the acquisition of OAK, the Corporation recorded goodwill of $43.5 million, which represented the synergies and economies of scale expected from combining the operations of the Corporation and OAK. In addition, the Corporation recorded other intangible assets in conjunction with the acquisition of OAK of $9.8 million.

Summary

The Corporation's net income was $17.8 million, or $0.54 per diluted share, in the first quarter of 2015, compared to net income of $13.8 million, or $0.46 per diluted share, in the first quarter of 2014 and net income of $15.3 million, or $0.46 per diluted share, in the fourth quarter of 2014. Nonrecurring transaction-related expenses totaled $1.4 million in the first quarter of 2015, $0.3 million in the first quarter of 2014 and $4.1 million in the fourth quarter of 2014. Excluding nonrecurring transaction-related expenses, net income was $18.7 million, or $0.57 per diluted share, in the first quarter of 2015, compared to $14.0 million and $18.4 million in the first quarter of 2014 and fourth quarter of 2014, respectively. Net income, excluding nonrecurring transaction-related expenses, in the first quarter of 2015, was 33% higher than the first quarter of 2014 due to higher net interest income and higher noninterest income, which were partially offset by higher operating expenses. The increases in income and expenses were due, in part, to the Northwestern trasaction. Net income, excluding nonrecurring transaction-related expenses, in the first quarter of 2015 was 1.7% higher than the fourth quarter of 2014 due largely to incremental income resulting from the Northwestern transaction.

Return on average assets, on an annualized basis, was 0.98% in the first quarter of 2015, compared to 0.90% in the first quarter of 2014 and 0.87% in the fourth quarter of 2014. Return on average equity, on an annualized basis, was 9.0% in the first quarter of 2015, compared to 8.0% in the first quarter of 2014 and 7.5% in the fourth quarter of 2014.

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Financial Condition

Total Assets

Total assets were $7.55 billion at March 31, 2015, an increase of $229 million, or 3.1%, from total assets of $7.32 billion at December 31, 2014, and an increase of $1.21 billion, or 19%, from total assets of $6.34 billion at March 31, 2014.

Interest-earning assets were $7.08 billion at March 31, 2015, an increase of $244 million, or 3.6%, from interest-earning assets of $6.83 billion at December 31, 2014, and an increase of $1.10 billion, or 18%, from interest-earning assets of $5.98 billion at March 31, 2014.

The increases in total assets and interest-earning assets during the three months ended March 31, 2015 were primarily due to seasonal increases in municipal customer deposits, with a large portion of the funds received being held in interest-bearing balances at the Federal Reserve Bank (FRB). The increases in total assets and interest-earning assets during the twelve-month period ended March 31, 2015 were attributable to a combination of the acquisition of Northwestern and an increase in customer deposits that were used to partially fund loan growth.

Investment Securities

The carrying value of investment securities totaled $1.06 billion at March 31, 2015, a decrease of $3.2 million, or 0.3%, from investment securities of $1.07 billion at December 31, 2014, and an increase of $126.2 million, or 13.5%, from investment securities of $935.9 million at March 31, 2014. The increase in investment securities during the twelve months ended March 31, 2015 was attributable to the Northwestern transaction, which was partially offset by the Corporation utilizing some of the liquidity from maturing investment securities to partially fund 2014 loan growth.

A summary of the composition of the carrying value of the Corporation's investments securities portfolio follows:

	March 31, 2015		December 31, 2014		March 31, 2014
	(In thousands)
Available-for-sale:
U.S. Treasury securities	$	8,302	$	8,259	$	—
Government sponsored agencies	250,430		263,503		91,610
State and political subdivisions	32,322		46,227		43,777
Residential mortgage-backed securities	219,601		239,807		288,738
Collateralized mortgage obligations	133,300		144,383		166,719
Corporate bonds	34,997		45,095		65,415
Preferred stock	1,692		1,590		1,559
Total available-for-sale investment securities	680,644		748,864		657,818
Held-to-maturity:
State and political subdivisions	370,950		305,913		267,599
Trust preferred securities	10,500		10,500		10,500
Total held-to-maturity investment securities	381,450		316,413		278,099
Total investment securities	$	1,062,094	$	1,065,277	$	935,917

At March 31, 2015, the Corporation's investment securities portfolio consisted of: U.S. Treasury securities, comprised of fixed-rate government debt obligations issued by the U.S. Department of Treasury, totaling $8.3 million; government sponsored agency (GSA) debt obligations, comprised primarily of fixed-rate instruments backed by Federal Home Loan Banks, Federal Farm Credit Banks and Student Loan Marketing Corporation, totaling $250.4 million; state and political subdivisions debt obligations, comprised primarily of general debt obligations of issuers primarily located in the State of Michigan, totaling $403.3 million; residential mortgage-backed securities (MBSs), comprised primarily of fixed-rate instruments backed by a U.S. government agency (Government National Mortgage Association) or government sponsored enterprises (Federal Home Loan Mortgage Corporation and Federal National Mortgage Association), totaling $219.6 million; collaterized mortgage obligations (CMOs), comprised of approximately 50% fixed-rate and 50% variable-rate instruments backed by the same U.S. government agency and government sponsored enterprises as the residential MBSs with average maturities of less than three years, totaling $133.3 million; corporate bonds, comprised primarily of debt obligations of large U.S. global financial organizations, totaling $35.0 million; preferred stock securities, comprised of preferred stock debt instruments of two large regional/national banks, totaling $1.7 million; and trust preferred securities (TRUPs), comprised of a 100% interest in a $10.0 million variable-rate TRUP of a small non-public bank

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holding company in Michigan and another variable-rate TRUP totaling $0.5 million. Fixed-rate instruments comprised 85% of the Corporation's investment securities portfolio at March 31, 2015.

The Corporation utilizes third-party pricing services to obtain market value prices for its investment securities portfolio. On a quarterly basis, the Corporation validates the reasonableness of prices received from the third-party pricing services through independent price verification on a sample of investment securities in the portfolio, data integrity validation based upon comparison of current market prices to prior period market prices and analysis of overall expectations of movement in market prices based upon the changes in the related yield curves and other market factors. On a periodic basis, the Corporation reviews the pricing methodology of the third-party pricing vendors and the results of the vendors' internal control assessments to ensure the integrity of the process that the vendors use to develop market pricing for the Corporation's investment securities portfolio.

The Corporation's investment securities portfolio, with a carrying value of $1.06 billion at March 31, 2015, had gross impairment of $9.1 million at that date. Management believed that the unrealized losses on investment securities were temporary in nature and due primarily to changes in interest rates on the investment securities and market illiquidity and not as a result of credit-related issues. Accordingly, the Corporation believed the impairment in its investment securities portfolio at March 31, 2015 was temporary in nature and, therefore, no impairment loss was recognized in the Corporation's consolidated statement of income for the three months ended March 31, 2015. However, other-than-temporary impairment (OTTI) may occur in the future as a result of material declines in the fair value of investment securities resulting from market, credit, economic or other conditions. A further discussion of the assessment of potential impairment and the Corporation's process that resulted in the conclusion that the impairment was temporary in nature follows.

At March 31, 2015, the gross impairment in the Corporation's investment securities portfolio of $9.1 million was comprised as follows: GSA securities, residential MBSs and CMOs, combined, of $0.9 million; state and political subdivisions securities of $4.9 million; corporate bonds of less than $0.1 million; and TRUPs of $3.2 million. The amortized costs and fair values of investment securities are disclosed in Note 3 to the consolidated financial statements.

GSA securities, residential MBSs and CMOs, included in the available-for-sale investment securities portfolio, had a combined amortized cost of $601.7 million and gross impairment of $0.9 million at March 31, 2015. Virtually all of the impaired investment securities in these categories are backed by the full faith and credit of the U.S. government or a guarantee of a U.S. government agency or government sponsored enterprise. The Corporation determined that the impairment on these investment securities was attributable to current market interest rates being higher than the yields being earned on these investment securities. The Corporation concluded that the impairment of its GSA securities, residential MBSs and CMOs was temporary in nature at March 31, 2015.

State and political subdivisions securities, included in the available-for-sale and the held-to-maturity investment securities portfolios, had an amortized cost of $402.7 million and gross impairment of $4.9 million at March 31, 2015. The Corporation's state and political subdivisions securities are almost entirely from issuers primarily located in the State of Michigan and are general obligations of the issuer, meaning that repayment of these obligations is funded by general tax collections of the issuer. The Corporation holds no debt obligations issued by the City of Detroit, Michigan. The gross impairment was attributable to impaired state and political subdivisions securities with an amortized cost of $159 million that generally mature beyond 2018. It was the Corporation's assessment that the impairment on these investment securities was attributable to current market interest rates being slightly higher than the yield on these investment securities, illiquidity in the market for a portion of these investment securities caused by the market's perception of the Michigan economy, and illiquidity in the market due to the nature of a portion of these investment securities. The Corporation concluded that the impairment of its state and political subdivisions securities was temporary in nature at March 31, 2015.

At March 31, 2015, the Corporation held two TRUPs in the held-to-maturity investment securities portfolio, with a combined amortized cost of $10.5 million and gross impairment of $3.2 million. Management reviewed available financial information of the issuers of the TRUPs as of March 31, 2015. One TRUP, with an amortized cost of $10.0 million, represents a 100% interest in a TRUP of a non-public bank holding company in Michigan. At March 31, 2015, the Corporation determined that the fair value of this TRUP was $7.0 million. The second TRUP, with an amortized cost of $0.5 million, represents a 10% interest in the TRUP of another non-public bank holding company in Michigan. At March 31, 2015, the Corporation determined the fair value of this TRUP was $0.3 million. The fair value measurements of the two TRUP investments were developed based upon market pricing observations of much larger banking institutions in an illiquid market, adjusted by risk measurements. The fair values of the Corporation's TRUPs were based on both observable inputs and appropriate risk adjustments that would be made by market participants. See the additional discussion of the development of the fair values of the TRUPs in Note 3 to the consolidated financial statements.

The issuer of the $10.0 million TRUP reported net income in the first quarter of 2015 and each of the three years ended December 31, 2014 and was categorized as well-capitalized under applicable regulatory requirements during that time. Based on an analysis of financial information provided by the issuer, it was the Corporation's opinion that, as of March 31, 2015, this issuer appeared to

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be a financially sound financial institution with sufficient liquidity to meet its financial obligations in 2015. The Corporation is not aware of any material adverse changes in the issuer's financial performance since the TRUP was issued and purchased by the Corporation nor any indication that any material adverse trends were developing that would suggest that the issuer would be unable to make all future principal and interest payments under the TRUP. Quarterly common stock cash dividends have consistently been paid by the issuer and the Corporation understands that the issuer's management anticipates cash dividends to continue to be paid in the future. The principal of $10.0 million of this TRUP matures in 2038, with interest payments of 360 basis points over the three-month London Interbank Offered Rate (LIBOR) due quarterly. All scheduled interest payments on this TRUP have been made on a timely basis. At March 31, 2015, the Corporation was not aware of any regulatory orders, memorandums of understanding or cease and desist orders that had been issued to the issuer or its subsidiaries. In reviewing all reasonably available financial information regarding the issuer, including past performance and its financial and liquidity position, it was the Corporation's opinion that the estimated future cash flows of the issuer supported the carrying value of the TRUP at its original cost of $10.0 million at March 31, 2015. While the total fair value of the TRUP was $3.0 million below the Corporation's amortized cost at March 31, 2015, the Corporation concluded that, based on the overall financial condition of the issuer, the impairment was temporary in nature at March 31, 2015.

The issuer of the $0.5 million TRUP reported net income in both 2014 and 2013. At March 31, 2015, the issuer was categorized as well-capitalized under applicable regulatory requirements. The principal of $0.5 million of this TRUP matures in 2033, with interest payments due quarterly. All scheduled interest payments on this TRUP have been made on a timely basis. At March 31, 2015, the Corporation was not aware of any regulatory orders, memorandums of understanding or cease and desist orders that had been issued to the issuer of this TRUP or any subsidiary. In reviewing all reasonably available financial information regarding the $0.5 million TRUP, it was the Corporation's opinion that the carrying value of this TRUP at its original cost of $0.5 million was supported by the issuer's financial position at March 31, 2015. While the fair value of the TRUP was $0.2 million below the Corporation's amortized cost at March 31, 2015, the Corporation concluded that the impairment was temporary in nature at March 31, 2015.

At March 31, 2015, the Corporation expected to fully recover the entire amortized cost basis of each impaired investment security in its investment securities portfolio at that date. Furthermore, at March 31, 2015, the Corporation did not have the intent to sell any of its impaired investment securities and believed that it was more-likely-than-not that the Corporation would not have to sell any of its impaired investment securities before a full recovery of amortized cost. However, there can be no assurance that OTTI losses will not be recognized on the TRUPs or on any other investment security in the future.

Loans

The Corporation's loan portfolio is comprised of commercial, commercial real estate, real estate construction and land development loans, referred to as the Corporation's commercial loan portfolio, and residential mortgage, consumer installment and home equity loans, referred to as the Corporation's consumer loan portfolio. At March 31, 2015, the Corporation's loan portfolio was $5.70 billion and consisted of loans in the commercial loan portfolio totaling $3.08 billion, or 54% of total loans, and loans in the consumer loan portfolio totaling $2.62 billion, or 46% of total loans. Loans at fixed interest rates comprised 76% of the Corporation's total loan portfolio at March 31, 2015, compared to 77% at December 31, 2014 and 76% at March 31, 2014.

Chemical Bank is a full-service commercial bank and the acceptance and management of credit risk is an integral part of the Corporation's business. The Corporation maintains loan policies and credit underwriting standards as part of the process of managing credit risk. These standards include making loans generally only within the Corporation's market areas. The Corporation's lending markets generally consist of communities across the lower peninsula of Michigan, except for the southeastern portion of Michigan. The Corporation has no foreign loans or any loans to finance highly leveraged transactions. The Corporation's lending philosophy is implemented through strong administrative and reporting controls. The Corporation maintains a centralized independent loan review function that monitors the approval process and ongoing asset quality of the loan portfolio.

Total loans were $5.70 billion at March 31, 2015, an increase of $14.6 million, or 0.3%, from total loans of $5.69 billion at December 31, 2014 and an increase of $950 million, or 20%, from total loans of $4.75 billion at March 31, 2014. The increase in total loans during the twelve-month period ended March 31, 2015 was attributable to organic loan growth of $475 million, or 10%, and $475 million of loans acquired in the Northwestern transaction. The organic loan growth generally occurred across all major loan categories and across all of the Corporation's banking markets and were attributable to a combination of improving economic conditions and higher loan demand, as well as the Corporation increasing its market share in both its commercial and consumer loan portfolios. The Northwestern transaction added commercial loans of $46 million, commercial real estate loans of $223 million, real estate construction loans of $3 million, land development loans of $11 million, residential real estate loans of $106 million, consumer installment loans of $6 million and home equity loans of $80 million as of the October 31, 2014 acquisition date.

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A summary of the composition of the Corporation's loan portfolio, by major loan category, follows:

	March 31, 2015		December 31, 2014		March 31, 2014
	(In thousands)
Commercial loan portfolio:
Commercial	$	1,356,169	$	1,354,881	$	1,208,641
Commercial real estate	1,616,923		1,557,648		1,279,167
Real estate construction	95,923		152,745		85,084
Land development	12,916		18,750		13,761
Subtotal	3,081,931		3,084,024		2,586,653
Consumer loan portfolio:
Residential mortgage	1,117,445		1,110,390		962,009
Consumer installment	844,066		829,570		675,412
Home equity	659,432		664,246		529,215
Subtotal	2,620,943		2,604,206		2,166,636
Total loans	$	5,702,874	$	5,688,230	$	4,753,289

A discussion of the Corporation’s loan portfolio by category follows.

Commercial Loan Portfolio

The Corporation's commercial loan portfolio is comprised of commercial loans, commercial real estate loans, real estate construction loans and land development loans. The Corporation's commercial loan portfolio is well diversified across business lines and has no concentration in any one industry. The commercial loan portfolio of $3.08 billion at March 31, 2015 included 91 loan relationships of $5.0 million or greater. These 91 loan relationships totaled $908 million, which represented 29% of the commercial loan portfolio at March 31, 2015, and included 31 loan relationships that had outstanding balances of $10 million or higher, totaling $480 million, or 16% of the commercial loan portfolio, at that date.The Corporation had 6 loan relationships that had outstanding balances of $20 million or higher, totaling $141 million, or 4.6% of the commercial loan portfolio, at March 31, 2015. The Corporation had 12 loan relationships at March 31, 2015 with loan balances greater than $5.0 million and less than $10 million, totaling $96 million, that had unfunded credit commitments totaling $60 million that, if advanced, could result in a loan relationship of $10 million or more.

Commercial loans consist of loans and lines of credit to varying types of businesses, including municipalities, school districts and nonprofit organizations, for the purpose of supporting working capital and operational needs and term financing of equipment. Repayment of such loans is generally provided through operating cash flows of the customer. Commercial loans are generally secured with inventory, accounts receivable, equipment, personal guarantees of the owner or other sources of repayment, although the Corporation may also obtain real estate as collateral.

Commercial loans were $1.36 billion at March 31, 2015, an increase of $1.3 million, or 0.1%, from commercial loans of $1.35 billion at December 31, 2014 and an increase of $147.5 million, or 12.2%, from commercial loans of $1.21 billion at March 31, 2014. Commercial loans represented 23.8% of the Corporation's loan portfolio at March 31, 2015, compared to 23.8% and 25.4% at December 31, 2014 and March 31, 2014, respectively.

Commercial real estate loans include loans that are secured by real estate occupied by the borrower for ongoing operations, non-owner occupied real estate leased to one or more tenants and vacant land that has been acquired for investment or future land development. Commercial real estate loans were $1.62 billion at March 31, 2015, an increase of $59.3 million, or 3.8%, from commercial real estate loans of $1.56 billion at December 31, 2014 and an increase of $337.8 million, or 26.4%, from commercial real estate loans of $1.28 billion at March 31, 2014. The increase in commercial real estate loans during the three months ended March 31, 2015 was largely attributable to the reclassification of loans from real estate construction as a result of the completion of the construction period. Loans secured by owner occupied properties, non-owner occupied properties and vacant land comprised 52%, 45% and 3%, respectively, of the Corporation's commercial real estate loans outstanding at March 31, 2015. Commercial real estate loans represented 28.4% of the Corporation's loan portfolio at March 31, 2015, compared to 27.4% and 26.9% at December 31, 2014 and March 31, 2014, respectively.

Commercial and commercial real estate lending is generally considered to involve a higher degree of risk than residential mortgage, consumer installment and home equity lending as they typically involve larger loan balances concentrated in a single borrower. In addition, the payment experience on loans secured by income-producing properties and vacant land loans is typically dependent on the success of the operation of the related project and is typically affected by adverse conditions in the real estate market and

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in the economy. The Corporation generally attempts to mitigate the risks associated with commercial and commercial real estate lending by, among other things, lending primarily in its market areas, lending across industry lines, not developing a concentration in any one line of business and using prudent loan-to-value ratios in the underwriting process. It is management's belief that the Corporation's commercial and commercial real estate loan portfolios are generally well-secured.

Real estate construction loans are primarily originated for construction of commercial properties and often convert to a commercial real estate loan at the completion of the construction period. Real estate construction loans were $95.9 million at March 31, 2015, a decrease of $56.8 million, or 37.2%, from real estate construction loans of $152.7 million at December 31, 2014 and an increase of $10.8 million, or 12.7%, from real estate construction loans of $85.1 million at March 31, 2014. The decrease in real estate construction loans during the three months ended March 31, 2015 was largely attributable to the reclassification of loans to commercial real estate as a result of the completion of the construction period. Real estate construction loans represented 1.7% of the Corporation's loan portfolio at March 31, 2015, compared to 2.7% and 1.8% at December 31, 2014 and March 31, 2014, respectively.

Land development loans include loans made to developers for the purpose of infrastructure improvements to vacant land to create finished marketable residential and commercial lots/land. A majority of the Corporation's land development loans consist of loans to develop residential real estate. Land development loans are generally originated with the intention that the loans will be repaid through the sale of finished properties by the developers within twelve months of the completion date. Land development loans were $12.9 million at March 31, 2015, a decrease of $5.8 million, or 31.1%, from land development loans of $18.8 million at December 31, 2014 and a decrease of $0.8 million, or 6.1%, from land development loans of $13.8 million at March 31, 2014. Land development loans represented 0.2% of the Corporation's loan portfolio at March 31, 2015, compared to 0.3% at both December 31, 2014 and March 31, 2014.

Real estate construction and land development lending involves a higher degree of risk than commercial real estate lending and residential mortgage lending because of the uncertainties of construction, including the possibility of costs exceeding the initial estimates, the need to obtain a tenant or purchaser of the property if it will not be owner-occupied or the need to sell developed properties. The Corporation generally attempts to mitigate the risks associated with real estate construction and land development lending by, among other things, lending primarily in its market areas, using prudent underwriting guidelines and closely monitoring the construction process. At March 31, 2015, $1.9 million, or 15%, of the Corporation's $12.9 million of land development loans were impaired, whereby the Corporation determined it was probable that the full amount of principal and interest would not be collected on these loans in accordance with their original contractual terms.

Consumer Loan Portfolio

The Corporation's consumer loan portfolio is comprised of residential mortgage loans, consumer installment loans and home equity loans and lines of credit.

Residential mortgage loans consist primarily of one- to four-family residential loans with fixed interest rates of fifteen years or less with amortization periods generally from fifteen to thirty years. The loan-to-value ratio at the time of origination is generally 80% or less. Loans with more than an 80% loan-to-value ratio generally require private mortgage insurance. At March 31, 2015, approximately 70% of the Corporation's residential mortgage loans had an original loan-to-value ratio of 80% or less.

Residential mortgage loans were $1.12 billion at March 31, 2015, an increase of $7.1 million, or 0.6%, from residential mortgage loans of $1.11 billion at December 31, 2014 and an increase of $155.4 million, or 16.2%, from residential mortgage loans of $962.0 million at March 31, 2014. Residential mortgage loans had historically involved the least amount of credit risk in the Corporation's loan portfolio, although the risk on these loans increased over the last several years when the unemployment rate increased and real estate property values declined in the State of Michigan. Residential mortgage loans also include loans to consumers for the construction of single family residences that are secured by these properties. Residential mortgage construction loans to consumers were $51.7 million at March 31, 2015, compared to $42.5 million at December 31, 2014 and $34.4 million at March 31, 2014. Residential mortgage loans represented 19.6% of the Corporation's loan portfolio at March 31, 2015, compared to 19.5% and 20.2% at December 31, 2014 and March 31, 2014, respectively. The Corporation had residential mortgage loans with maturities beyond five years and that were at fixed interest rates totaling $304 million at March 31, 2015, compared to $306 million and $313 million at December 31, 2014 and March 31, 2014, respectively.

The Corporation's consumer installment loans consist of relatively small loan amounts to consumers to finance personal items (primarily automobiles, recreational vehicles and marine vehicles) and are comprised primarily of indirect loans purchased from dealerships. Consumer installment loans were $844.1 million at March 31, 2015, an increase of $14.5 million, or 1.7%, from consumer installment loans of $829.6 million at December 31, 2014 and an increase of $168.7 million, or 25.0%, from consumer installment loans of $675.4 million at March 31, 2014. At March 31, 2015, collateral securing consumer installment loans was comprised approximately as follows: automobiles - 61%; recreational vehicles - 24%; marine vehicles - 11%; other collateral - 3%; and unsecured - 1%. Consumer installment loans represented 14.8% of the Corporation's loan portfolio at March 31, 2015, compared to 14.6% and 14.2% at December 31, 2014 and March 31, 2014, respectively.

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The Corporation's home equity loans, including home equity lines of credit, are comprised of loans to consumers who utilize equity in their personal residence, including junior lien mortgages, as collateral to secure the loan or line of credit. Home equity loans were $659.4 million at March 31, 2015, a decrease of $4.8 million, or 0.7%, from home equity loans of $664.2 million at December 31, 2014 and an increase of $130.2 million, or 24.6%, from home equity loans of $529.2 million at March 31, 2014. At March 31, 2015, approximately 60% of the Corporation's home equity loans were first lien mortgages and 40% were junior lien mortgages. Home equity loans represented 11.6% of the Corporation's loan portfolio at March 31, 2015, compared to 11.7% and 11.1% at December 31, 2014 and March 31, 2014, respectively. Home equity lines of credit comprised 35% of the Corporation's home equity loans at both March 31, 2015 and December 31, 2014, compared to 34% at March 31, 2014. The majority of the Corporation's home equity lines of credit are comprised of loans with payments of interest only and original maturities of up to ten years and include junior lien mortgages whereby the first lien mortgage is held by a nonaffiliated financial institution.

Consumer installment and home equity loans generally have shorter terms than residential mortgage loans, but generally involve more credit risk than residential mortgage lending because of the type and nature of the collateral. The Corporation experienced decreases in losses on consumer installment and home equity loans, with net loan losses totaling 14 basis points (annualized) of average consumer installment and home equity loans during the first three months of 2015, compared to 32 basis points and 43 basis points of average consumer installment and home equity loans in 2014 and 2013, respectively. Consumer installment and home equity loans are spread across many individual borrowers, which minimizes the risk per loan transaction. The Corporation originates consumer installment and home equity loans utilizing a computer-based credit scoring analysis to supplement the underwriting process. Consumer installment and home equity lending collections are dependent on the borrowers' continuing financial stability and are more likely to be affected by adverse personal situations. Collateral values on properties securing consumer installment and home equity loans are negatively impacted by many factors, including the physical condition of the collateral and property values, although losses on consumer installment and home equity loans are often more significantly impacted by the unemployment rate and other economic conditions. The unemployment rate in the State of Michigan was 5.6% at March 31, 2015 compared to 6.3% and 7.5% at December 31, 2014 and March 31, 2014, respectively, although still higher than the national average of 5.5% at March 31, 2015.

Nonperforming Assets

Nonperforming assets include nonperforming loans, which consist of originated loans for which the accrual of interest has been discontinued (nonaccrual loans), originated loans that are past due as to principal or interest by 90 days or more and still accruing interest and nonperforming loans that have been modified under troubled debt restructurings (TDRs). Nonperforming assets also include assets obtained through foreclosures and repossessions. The Corporation transfers an originated loan that is 90 days or more past due to nonaccrual status (except for loans that are secured by residential real estate, which are transferred at 120 days past due), unless it believes the loan is both well-secured and in the process of collection. For loans classified as nonaccrual, including those with modifications, the Corporation does not expect to receive all principal and interest payments, and therefore, any payments are recognized as principal reductions when received. Conversely, the Corporation expects to receive all principal and interest payments on loans that meet the definition of nonperforming TDR status. TDRs continue to be reported as nonperforming loans until a six-month payment history of principal and interest payments is sustained in accordance with the terms of the loan modification, at which time the loan is no longer considered a nonperforming asset and the Corporation moves the loan to a performing TDR status.

Nonperforming assets were $87.5 million at March 31, 2015, an increase of $2.1 million, or 2.5%, from $85.4 million at December 31, 2014and an increase of $0.9 million, or 1.0%, from $86.6 million at March 31, 2014. Nonperforming assets represented 1.16%, 1.17%, and 1.37%of total assets at March 31, 2015, December 31, 2014 and March 31, 2014, respectively. The increase in nonperforming assets during the three-month period ended March 31, 2015 was primarily attributable to one commercial loan relationship moving to nonaccrual during the quarter. The increase in nonperforming assets during the twelve-month period ended March 31, 2015 was attributable to an increase in other real estate and repossessed assets of $4.7 million which was partially offset by a decline in nonperforming loans of $3.8 million. The increase in other real estate and repossessed assets during the twelve-month period ended March 31, 2015 was primarily attributable to $3.7 million of other real estate acquired in the Northwestern transaction. The Corporation's nonperforming assets are notconcentrated in any one industry or any one geographical area within Michigan. At March 31, 2015, there were two commercial loanrelationships exceeding $5.0 million, totaling $11.0 million, which were in nonperforming status, of which one totaling $5.5 million has been in nonperforming status for over five years. While the economic climate in Michigan continues to improve, based on declines in both residential and commercial real estate appraised values due to the weakness in the Michigan economy over the past several years, management continues to evaluate and, when appropriate, obtain new appraisals or discount appraised values of existing appraisals to compute net realizable values of nonperforming real estate secured loans and other real estate properties.

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Nonperforming assets at March 31, 2015, December 31, 2014 and March 31, 2014did not include impaired acquired loans totaling $11.2 million,$19.9 million and $11.5 million, respectively, even though these loans were not performing in accordance with their original contractual terms. Acquired loans that are not performing in accordance with contractual terms are not reported as nonperforming loans because these loans are recorded in pools at their net realizable value based on the principal and interest the Corporation expects to collect on these loan pools. Acquired loans not performing in accordance with the loan's original contractual terms are included in the Corporation's impaired loan schedule in Note 4 to the consolidated financial statements.

The following schedule provides a summary of nonperforming assets:

	March 31, 2015			December 31, 2014			March 31, 2014
	(Dollars in thousands)
Nonaccrual loans:
Commercial	$	18,904		$	16,418		$	18,251
Commercial real estate	24,766			24,966			27,568
Real estate construction	663			162			160
Land development	290			225			2,267
Residential mortgage	6,514			6,706			6,589
Consumer installment	433			500			806
Home equity	1,870			1,667			2,046
Total nonaccrual loans	53,440			50,644			57,687
Accruing loans contractually past due 90 days or more as to interest or principal payments:
Commercial	52			170			43
Commercial real estate	148			—			730
Real estate construction	—			—			—
Land development	—			—			—
Residential mortgage	172			557			—
Consumer installment	—			—			—
Home equity	429			1,346			622
Total accruing loans contractually past due 90 days or more as to interest or principal payments	801			2,073			1,395
Nonperforming TDRs:
Commercial loan portfolio	15,810			15,271			11,218
Consumer loan portfolio	2,690			3,196			6,244
Total nonperforming TDRs	18,500			18,467			17,462
Total nonperforming loans	72,741			71,184			76,544
Other real estate and repossessed assets(1)	14,744			14,205			10,056
Total nonperforming assets	$	87,485		$	85,389		$	86,600
Nonperforming loans as a percent of total loans	1.28		%	1.25		%	1.61		%
Nonperforming assets as a percent of total assets	1.16		%	1.17		%	1.37		%

(1) Includes property acquired through foreclosure and by acceptance of a deed in lieu of foreclosure and other property held-for-sale.

The Corporation's nonaccrual loans that meet the definition of a TDR (nonaccrual TDR) totaled $37.3 million at March 31, 2015, compared to $37.2 million at December 31, 2014 and $44.4 million at March 31, 2014. These loans have been modified by providing the borrower a financial concession that is intended to improve the Corporation's probability of collection of the amounts due.

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The following schedule summarizes changes in nonaccrual loans during the three months ended March 31, 2015 and 2014.

	Three Months Ended
	March 31,
	2015			2014
	(In thousands)
Balance at beginning of period	$	50,644		$	61,897
Additions during period	10,581			6,667
Principal balances charged off	(2,402		)	(2,952		)
Transfers to other real estate/repossessed assets	(1,782		)	(2,022		)
Returned to accrual status	(626		)	(2,297		)
Payments received	(2,975		)	(3,606		)
Balance at end of period	$	53,440		$	57,687

Nonperforming Loans

The following schedule provides the composition of nonperforming loans, by major loan category, as of March 31, 2015, December 31, 2014, and March 31, 2014.

	March 31, 2015				December 31, 2014				March 31, 2014
	Amount		Percent of Total		Amount		Percent of Total		Amount		Percent of Total
	(Dollars in thousands)
Commercial loan portfolio:
Commercial	$	22,448	30.9	%	$	21,121	29.7	%	22,191		29.0	%
Commercial real estate	37,182		51.1		35,654		50.1		35,503		46.4
Real estate construction	663		0.9		162		0.2		160		0.2
Land development	340		0.5		275		0.4		2,383		3.1
Subtotal-commercial loan portfolio	60,633		83.4		57,212		80.4		60,237		78.7
Consumer loan portfolio:
Residential mortgage	9,376		12.9		10,459		14.7		12,833		16.8
Consumer installment	433		0.6		500		0.7		806		1.0
Home equity	2,299		3.1		3,013		4.2		2,668		3.5
Subtotal-consumer loan portfolio	12,108		16.6		13,972		19.6		16,307		21.3
Total nonperforming loans	$	72,741	100.0	%	$	71,184	100.0	%	$	76,544	100.0	%

Total nonperforming loans were $72.7 million at March 31, 2015, an increaseof $1.6 million, or 2.2%, compared to $71.2 million at December 31, 2014, and a decrease of $3.8 million,or 5.0%,compared to $76.5 million at March 31, 2014. The Corporation's nonperforming loans in the commercial loan portfolio were $60.6 million at March 31, 2015, an increase of $3.4 million, or 6.0%, from $57.2 million at December 31, 2014 and an increase of $0.4 million,or 0.7%, from $60.2 million at March 31, 2014. The increase in nonperforming loans in the commercial loan portfolio during the three-month period ended March 31, 2015 was largely attributable to one commercial loan relationship, totaling $2.3 million, moving to nonaccrual status during the quarter. The loans in this relationship required a specific impairment reserve of $0.7 million at March 31, 2015. Nonperforming loans in the commercial loan portfolio comprised 83% of total nonperforming loans at March 31, 2015, compared to 80% at December 31, 2014 and 79% at March 31, 2014. The Corporation's nonperforming loans in the consumer loan portfolio were $12.1 million at March 31, 2015, a decrease of $1.9 million, or 13.3%, from $14.0 million at December 31, 2014 and a decrease of $4.2 million, or 25.7%, from $16.3 million at March 31, 2014. The decreases in nonperforming loans in the consumer loan portfolio were primarily attributable to net loan charge-offs.

Nonperforming Loans — Commercial Loan Portfolio

Nonperforming commercial loans were $22.4 million at March 31, 2015, an increase of $1.3 million, or 6.3%, from $21.1 million at December 31, 2014 and an increase of $0.3 million, or 1.2%, from $22.2 million at March 31, 2014. The increase in nonperforming commercial loans during the three-month period ended March 31, 2015 was largely attributable to the commercial loan relationship previously discussed. Nonperforming commercial loans comprised 1.7% of total commercial loans at March 31, 2015, compared to 1.6% at December 31, 2014 and 1.8% at March 31, 2014. At March 31, 2015, approximately 37% of the Corporation's nonperforming commercial loans were secured by income-producing farmland, with the largest concentration of these nonperforming commercial loans to one customerrelationship totaling $5.5 million that was secured by income-producing farmland

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and other assets and has been in nonperforming status for over one year.At March 31, 2015, the loans in this relationship were believed to be adequately secured and the Corporation did not require a specific impairment reserve on them at that date.

Nonperforming commercial real estate loans were $37.2 million at March 31, 2015, an increase of $1.5 million, or 4.3%, from $35.7 million at December 31, 2014 and an increase of $1.7 million, or 4.7%, from $35.5 million at March 31, 2014.The increase in nonperforming commercial real estate loans during the three-month period ended March 31, 2015 was largely attributable to two loan relationships that were modified as troubled debt restructurings during the quarter. Nonperforming commercial real estate loans comprised 2.3% of total commercial real estate loans at March 31, 2015, compared to 2.3% and 2.8% at December 31, 2014 and March 31, 2014, respectively. Nonperforming commercial real estate loans secured by owner occupied real estate, non-owner occupied real estate and vacant land totaled $19.8 million, $9.3 million and $8.1 million, respectively, at March 31, 2015, and comprised 2.7%, 1.8% and 22.2%, respectively, of total owner occupied real estate, non-owner occupied real estate and vacant land loans included in the Corporation's originated commercial real estate loans at March 31, 2015. At March 31, 2015, the Corporation's nonperforming commercial real estate loans were comprised of a diverse mix of commercial lines of business and were also geographically disbursed throughout the Corporation's market areas.The largest concentration of nonperforming commercial real estate loans at March 31, 2015 was one customerrelationship totaling $5.5 million that was primarily secured by vacant land and has been in nonperforming status for over five years.This same customer relationship had nonperforming land development loans of $0.1 million andnonperforming residential mortgage loans of $0.4 million. At March 31, 2015, the loans in this relationship were believed to be adequately secured and the Corporation did not require a specific impairment reserve on them at that date.

Nonperforming real estate construction loans were $0.7 million at March 31, 2015, compared to $0.2 million at both December 31, 2014 and March 31, 2014. Nonperforming real estate construction loans comprised 0.7% of total real estate construction loans at March 31, 2015, compared to 0.1% and 0.2% at December 31, 2014 and March 31, 2014, respectively.

Nonperforming land development loans were $0.3 million at both March 31, 2015 and December 31, 2014, compared to $2.4 million at March 31, 2014. Nonperforming land development loans comprised 2.6% of total land development loans at March 31, 2015, compared to 1.5% and 17.3% at December 31, 2014 and March 31, 2014, respectively. At March 31, 2015, nonperforming land development loans were secured primarily by residential real estate improved lots and housing units.

At March 31, 2015, the Corporation had nonperforming loans in the commercial loan portfolio of $2.9 million that were secured by real estate and were in various stages of foreclosure, compared to $2.2 million at December 31, 2014 and $3.6 million at March 31, 2014.

The following schedule presents information related to stratification of nonperforming loans in the commercial loan portfolio by dollar amount at March 31, 2015, December 31, 2014 and March 31, 2014.

	March 31, 2015			December 31, 2014			March 31, 2014
	Number of Borrowers	Amount		Number of Borrowers	Amount		Number of Borrowers	Amount
	(Dollars in thousands)
$5,000,000 or more	2	$	11,030	2	$	11,418	2	$	12,246
$2,500,000 – $4,999,999	1	3,584		2	6,298		—	—
$1,000,000 – $2,499,999	9	13,853		5	7,157		6	9,451
$500,000 – $999,999	20	13,439		22	14,892		25	17,868
$250,000 – $499,999	16	6,048		17	5,466		24	7,989
Under $250,000	166	12,679		167	11,981		175	12,683
Total	214	$	60,633	215	$	57,212	232	$	60,237

Nonperforming Loans — Consumer Loan Portfolio

Nonperforming residential mortgage loans were $9.4 million at March 31, 2015,a decrease of $1.1 million, or 10.4%, from $10.5 million at December 31, 2014 and a decrease of $3.5 million, or 26.9%,from $12.8 million at March 31, 2014. Nonperforming residential mortgage loans comprised 0.8% of total residential mortgage loans at March 31, 2015, compared to 0.9% and 1.3% of total residential mortgage loans at December 31, 2014 and March 31, 2014, respectively. At March 31, 2015, a total of $2.2 million of nonperforming residential mortgage loans were in various stages of foreclosure, compared to $2.3 million at December 31, 2014 and $3.7 million at March 31, 2014.

Nonperforming consumer installment loans were $0.4 million at March 31, 2015, compared to $0.5 million at December 31, 2014 and $0.8 million at March 31, 2014. Nonperforming consumer installment loans comprised 0.1% of total consumer installment loans at March 31, 2015, December 31, 2014 and March 31, 2014.

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Nonperforming home equity loans were $2.3 million at March 31, 2015, a decrease of $0.7 million, or 23.7%, from $3.0 million at December 31, 2014 and a decrease of $0.4 million, or 13.8%, from $2.7 million at March 31, 2014. Nonperforming home equity loans comprised 0.3% of total home equity loans at March 31, 2015, compared to 0.5% at both December 31, 2014 and March 31, 2014.

Troubled Debt Restructurings (TDRs)

The generally unfavorable economic climate that had existed in Michigan in recent years resulted in a large number of both business and consumer customers experiencing cash flow issues making it difficult to maintain their loan balances in a performing status. The Corporation determined that it was probable that certain customers who were past due on their loans, if provided a modification of their loans by reducing their monthly payments, would be able to bring their loan relationships to a performing status. The Corporation believes loan modifications will potentially result in a lower level of loan losses and loan collection costs than if the Corporation proceeded immediately through the foreclosure process with these borrowers. The loan modifications involve granting concessions to borrowers who are experiencing financial difficulty and, therefore, these loans meet the criteria to be considered TDRs.

The Corporation's performing and nonperforming TDRs continue to accrue interest at the loan's original interest rate as the Corporation expects to collect the remaining principal balance on the loan. A TDR is reported as a nonperforming loan (nonperforming TDR) until a six-month payment history of principal and interest payments is sustained in accordance with the loan modification, at which time the Corporation moves the loan to a performing status (performing TDR). If a performing TDR becomes contractually past due more than 30 days, it is transferred to a nonperforming status. Accordingly, all of the Corporation's performing TDRs at March 31, 2015 were current or less than 30 days past due. The Corporation's nonaccrual loans that meet the definition of a TDR do not accrue interest as the Corporation does not expect to collect the full amount of principal and interest owed from the borrower on these loans.

The following summarizes the Corporation's TDRs at March 31, 2015, December 31, 2014 and March 31, 2014:

	Performing TDRs		Nonperforming TDRs						Nonaccrual TDRs		Total
			Current		Past Due 31-90 Days		Subtotal
	(In thousands)
March 31, 2015
Commercial loan portfolio	$	28,784	$	13,898	$	1,912	$	15,810	$	32,917	$	77,511
Consumer loan portfolio	17,197		2,356		334		2,690		4,426		24,313
Total TDRs	$	45,981	$	16,254	$	2,246	$	18,500	$	37,343	$	101,824
December 31, 2014
Commercial loan portfolio	$	29,179	$	14,608	$	663	$	15,271	$	32,597	$	77,047
Consumer loan portfolio	16,485		2,652		544		3,196		4,594		24,275
Total TDRs	$	45,664	$	17,260	$	1,207	$	18,467	$	37,191	$	101,322
March 31, 2014
Commercial loan portfolio	$	28,123	$	9,365	$	1,853	$	11,218	$	40,511	$	79,852
Consumer loan portfolio	13,700		4,478		1,766		6,244		3,875		23,819
Total TDRs	$	41,823	$	13,843	$	3,619	$	17,462	$	44,386	$	103,671

The Corporation's performing and nonperforming TDRs in the commercial loan portfolio generally consist of loans where the Corporation has allowed borrowers to either (i) temporarily defer scheduled principal payments and make interest-only payments for a short period of time (generally six months to one year) at the stated interest rate of the original loan agreement, (ii) lower payments due to a modification of the loan's original contractual terms, or (iii) enter into moderate extensions of the loan's original contractual maturity date. These TDRs are individually evaluated for impairment. Based on this evaluation, the Corporation does not expect to incur a loss on these TDRs based on its assessment of the borrowers' expected cash flows, as the pre- and post-modification effective yields are approximately the same for these loans. Accordingly, no additional provision for loan losses has been recognized related to these TDRs. Nonperforming TDRs that have made at least six consecutive months of principal and interest payments under a formal modification agreement are classified by the Corporation as performing TDRs. If a TDR in the commercial loan portfolio becomes 90 days past due as to principal or interest, or if it becomes probable that any remaining principal and interest payments due on the loan will not be collected in accordance with the modified contractual terms, the loan is transferred to nonaccrual TDR status.

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Due to the borrowers' sustained repayment histories, the Corporation had performing TDRs in the commercial loan portfolio of $28.8 million, $29.2 million and $28.1 million at March 31, 2015, December 31, 2014 and March 31, 2014, respectively. The Corporation also had nonperforming TDRs in the commercial loan portfolio of $15.8 million, $15.3 million and $11.2 million at March 31, 2015, December 31, 2014 and March 31, 2014, respectively. The Corporation's nonperforming TDRs in the commercial loan portfolio are categorized as a risk grade 7 (substandard - accrual) under the Corporation's risk rating system, which is further described in Note 4 to the consolidated financial statements. The weighted average contractual interest rate of the Corporation's performing and nonperforming TDRs in the commercial loan portfolio was 5.40% at March 31, 2015, compared to 5.46% at December 31, 2014 and 5.57% at March 31, 2014. At March 31, 2015, the Corporation had $32.9 million of nonaccrual TDRs in the commercial loan portfolio, compared to $32.6 million and $40.5 million, at December 31, 2014 and March 31, 2014, respectively.

A summary of changes in the Corporation's performing and nonperforming TDRs in the commercial loan portfolio for the three months ended March 31, 2015 follows:

	Three Months Ended March 31, 2015
	Performing			Nonperforming			Total
	(In thousands)
Balance at beginning of period	$	29,179		$	15,271		$	44,450
Additions for modifications	—			2,244			2,244
Transfers to performing TDR status	1,540			(1,540		)	—
Transfers to nonperforming TDR status	(1,360		)	1,360			—
Transfers from nonaccrual status	—			243			243
Transfers to nonaccrual status	—			(868		)	(868		)
Principal payments and pay-offs	(575		)	(900		)	(1,475		)
Balance at end of period	$	28,784		$	15,810		$	44,594

The Corporation's TDRs in the consumer loan portfolio generally consist of loans where the Corporation has reduced a borrower's monthly payments by decreasing the interest rate charged on the loan (generally to a range of 3% to 5%) for a specified period of time (generally 24 months). Once the borrowers have made at least six consecutive months of principal and interest payments under a formal modification agreement, they are classified as performing TDRs. These loans are moved to nonaccrual TDR status if the loan becomes 90 days past due as to principal or interest, or sooner if conditions warrant.

The Corporation had performing TDRs in the consumer loan portfolio of $17.2 million, $16.5 million and $13.7 million at March 31, 2015, December 31, 2014 and March 31, 2014, respectively. The Corporation also had nonperforming TDRs in the consumer loan portfolio of $2.7 million, $3.2 million and $6.2 million at March 31, 2015, December 31, 2014 and March 31, 2014, respectively. The weighted average contractual interest rate on the Corporation's performing and nonperforming TDRs in the consumer loan portfolio was 4.77% at March 31, 2015, compared to 4.66% at December 31, 2014 and 4.58% at March 31, 2014. At March 31, 2015, the Corporation had $4.4 million of nonaccrual TDRs in the consumer loan portfolio, compared to $4.6 million and $3.9 million, at December 31, 2014 and March 31, 2014, respectively.

The Corporation's cumulative redefault rate as of March 31, 2015 on its performing and nonperforming TDRs, which represents the percentage of these TDRs that transferred to nonaccrual status since the Corporation began such modifications in 2009, was 18% for performing and nonperforming TDRs in the commercial loan portfolio and 20% for performing and nonperforming TDRs in the consumer loan portfolio. The Corporation's cumulative redefault rate does not include loans that have been modified while in nonaccrual status that remain in nonaccrual status as the Corporation does not expect to collect the full amount of principal and interest owed from the borrower on these loans.

Other Real Estate and Repossessed Assets

Other real estate and repossessed assets are components of nonperforming assets. These include other real estate (ORE), comprised of residential and commercial real estate and land development properties acquired through foreclosure or by acceptance of a deed in lieu of foreclosure, and repossessed assets, comprised of other personal and commercial assets.ORE totaled $14.5 million at March 31, 2015, an increaseof $0.5 million, or 3.8%, from $14.0 million at December 31, 2014 and an increase of $4.8 million, or 49.1%,from $9.7 million atMarch 31, 2014. The increase in other real estate and repossessed assets during the twelve-month period ended March 31, 2015 was primarily attributable to $3.7 million of other real estate acquired in the Northwestern transaction. Repossessed assets totaled $0.3 million at March 31, 2015, December 31, 2014 and March 31, 2014.

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The following schedule provides the composition of ORE at March 31, 2015, December 31, 2014 and March 31, 2014:

	March 31, 2015		December 31, 2014		March 31, 2014
	(In thousands)
Composition of ORE:
Vacant land	$	4,859	$	5,285	$	2,683
Commercial real estate properties	6,921		6,419		4,562
Residential real estate properties	2,702		2,219		2,469
Residential land development properties	—		30		—
Total ORE	$	14,482	$	13,953	$	9,714

The following schedule summarizes ORE activity during the three months ended March 31, 2015 and 2014.

	Three Months Ended March 31,
	2015			2014
	(In thousands)
Balance at beginning of period	$	13,953		$	9,518
Additions	3,080			1,461
Write-downs to fair value	(266		)	(116		)
Dispositions	(2,285		)	(1,149		)
Balance at end of period	$	14,482		$	9,714

The Corporation's ORE is carried at the lower of cost or fair value less estimated cost to sell.The historically large inventory of real estate properties for sale across the State of Michigan has resulted in an increase in the Corporation's carrying time and cost of holding ORE.Consequently, the Corporation had $5.5 million in ORE at March 31, 2015 that had been held in excess of one year, of which$3.4 million had been held in excess of three years.Because the redemption period on foreclosures is relatively long in Michigan (six months to one year) and the Corporation had $5.1 million of nonperforming loans that were in the process of foreclosure at March 31, 2015, it is anticipated that the level of the Corporation's ORE will remain at historically elevated levels.

All of the Corporation's ORE properties have been written down to fair value through a charge-off against the allowance for loan losses at the time the loan was transferred to ORE or through a subsequent write-down, recorded as an operating expense, to recognize a further market value decline of the property after the initial transfer date. Accordingly, at March 31, 2015, the carrying value of ORE of $14.5 million was reflective of $20.4 million in charge-offs, write-downs and acquisition-related fair value adjustments and represented 42% of the contractual loan balance remaining at the time these loans were classified as nonperforming.

During the three months endedMarch 31, 2015, the Corporation sold 87 ORE properties for net proceeds of $3.1 million. On an average basis, the net proceeds from these sales represented 137% of the carrying value of the property at the time of sale, with the net proceeds representing 56% of the remaining contractual loan balance at the time these loans were classified as nonperforming.

Impaired Loans

A loan is considered impaired when management determines it is probable that all of the principal and interest due will not be paid according to the original contractual terms of the loan agreement. Impaired loans are accounted for at the lower of the present value of expected cash flows discounted at the loan's effective interest rate or the estimated fair value of the collateral, if the loan is collateral dependent. A portion of the allowance for loan losses is specifically allocated to impaired loans. The process of measuring impaired loans and the allocation of the allowance for loan losses requires judgment and estimation. The eventual outcome may differ from amounts estimated.

Impaired loans include nonaccrual loans (including nonaccrual TDRs), performing and nonperforming TDRs and acquired loans that were not performing in accordance with their original contractual terms. Impaired loans totaled $129.2 million at March 31, 2015, a decrease of $5.5 million compared to $134.7 million at December 31, 2014 and an increase of $0.7 million compared to $128.5 million at March 31, 2014.

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A summary of impaired loans at March 31, 2015, December 31, 2014 and December 31, 2014 follows:

	March 31, 2015		December 31, 2014		March 31, 2014
	(In thousands)
Impaired loans - commercial loan portfolio:
Originated commercial loan portfolio:
Nonaccrual loans	$	44,623	$	41,771	$	48,246
Nonperforming TDRs	15,810		15,271		11,218
Performing TDRs	28,784		29,179		28,123
Subtotal	89,217		86,221		87,587
Acquired commercial loan portfolio	11,231		19,892		11,523
Total impaired loans - commercial loan portfolio	100,448		106,113		99,110
Impaired loans - consumer loan portfolio:
Nonaccrual loans	8,817		8,873		9,441
Nonperforming TDRs	2,690		3,196		6,244
Performing TDRs	17,197		16,485		13,700
Total impaired loans - consumer loan portfolio	28,704		28,554		29,385
Total impaired loans	$	129,152	$	134,667	$	128,495

The following schedule summarizes impaired loans to commercial borrowers and the related valuation allowance at March 31, 2015, December 31, 2014 and December 31, 2014 and partial loan charge-offs (confirmed losses) taken on these impaired loans:

	Amount		Valuation Allowance		Confirmed Losses		Cumulative Inherent Loss Percentage
	(Dollars in thousands)
March 31, 2015
Impaired loans – originated commercial loan portfolio:
With valuation allowance and no charge-offs	$	4,948	$	1,541	$	—	31	%
With valuation allowance and charge-offs	265		74		275		65
With charge-offs and no valuation allowance	18,517		—		14,560		44
Without valuation allowance or charge-offs	65,487		—		—		—
Total	89,217		$	1,615	$	14,835	16	%
Impaired acquired loans	11,231
Total impaired loans to commercial borrowers	$	100,448
December 31, 2014
Impaired loans – originated commercial loan portfolio:
With valuation allowance and no charge-offs	$	2,700	$	860	$	—	32	%
With valuation allowance and charge-offs	853		143		414		44
With charge-offs and no valuation allowance	17,770		—		14,974		46
Without valuation allowance or charge-offs	64,898		—		—		—
Total	86,221		$	1,003	$	15,388	16	%
Impaired acquired loans	19,892
Total impaired loans to commercial borrowers	$	106,113
March 31, 2014
Impaired loans – originated commercial loan portfolio:
With valuation allowance and no charge-offs	$	6,873	$	1,556	$	—	23	%
With valuation allowance and charge-offs	381		65		328		55
With charge-offs and no valuation allowance	22,207		—		17,479		44
Without valuation allowance or charge-offs	58,126		—		—		—
Total	87,587		$	1,621	$	17,807	18	%
Impaired acquired loans	11,523
Total impaired loans to commercial borrowers	$	99,110

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After analyzing the various components of the customer relationships and evaluating the underlying collateral of impaired loans, the Corporation determined that impaired loans of the commercial loan portfoliototaling $5.2 million at March 31, 2015 required a specific allocation of the allowance for loan losses (valuation allowance) of $1.6 million, compared to $3.6 million of impaired loans in the commercial loan portfolio with a valuation allowance of $1.0 million at December 31, 2014 and $7.3 million of impaired loans in the commercial loan portfolio with a valuation allowance of $1.6 million at March 31, 2014. Confirmed losses represent partial loan charge-offs on impaired loans due primarily to the receipt of a recent third-party property appraisal indicating the value of the collateral securing the loan was below the loan balance and management determined that full collection of the loan balance is not likely. The Corporation's performing and nonperforming TDRs in the commercial loan portfolio did not require a valuation allowance as the Corporation expected to collect the full principal and interest owed on each of these loans in accordance with their modified terms.

The Corporation generally does not recognize a valuation allowance for impaired loans in the consumer loan portfolio as these loans are comprised of smaller-balance homogeneous loans that are collectively evaluated for impairment. However, the Corporation had avaluation allowance attributable to TDRs in the consumer loan portfolio of $0.3 million at March 31, 2015, compared to $0.3 million at December 31, 2014 and $0.4 million at March 31, 2014, related to the reduction in the present value of expected future cash flows for these loans discounted at their original effective interest rates.

Impaired loans included acquired loans totaling $11.2 million, $19.9 million and $11.5 million at March 31, 2015, December 31, 2014 and March 31, 2014, respectively, that were not performing in accordance with the original contractual terms of the loans. These loans did not require a valuation allowance as they are recorded in pools at their net realizable value based on the principal and interest the Corporation expects to collect on these loan pools. These loans are not included in the Corporation's nonperforming loans.

Allowance for Loan Losses

The allowance for loan losses (allowance) provides for probable losses in the originated loan portfolio that have been identified with specific customer relationships and for probable losses believed to be inherent in the remainder of the originated loan portfolio but that have not been specifically identified. The allowance is comprised of specific valuation allowances (assessed for originated loans that have known credit weaknesses), pooled allowances based on assigned risk ratings and historical loan loss experience for each loan type, and an unallocated allowance for imprecision due to the subjective nature of the specific and pooled allowance methodology. Management evaluates the allowance on a quarterly basis in an effort to ensure the level is adequate to absorb probable losses inherent in the loan portfolio. This evaluation process is inherently subjective as it requires estimates that may be susceptible to significant change and has the potential to affect net income materially. The Corporation's methodology for measuring the adequacy of the allowance is comprised of several key elements, which include a review of the loan portfolio, both individually and by category, and consideration of changes in the mix and volume of the loan portfolio, actual loan loss experience, review of collateral values, the financial condition of the borrowers, industry and geographical exposures within the portfolio, economic conditions and employment levels of the Corporation's local markets and other factors affecting business sectors. Management believes that the allowance is currently maintained at an appropriate level, considering the inherent risk in the loan portfolio. Future significant adjustments to the allowance may be necessary due to changes in economic conditions, delinquencies or the level of loan losses incurred.

The following schedule summarizes information related to the Corporation's allowance for loan losses:

	March 31, 2015			December 31, 2014			March 31, 2014
	(Dollars in thousands)
Allowance for loan losses:
Originated loans	$	75,256		$	75,183		$	77,973
Acquired loans	—			500			500
Total	$	75,256		$	75,683		$	78,473
Nonperforming loans	$	72,741		$	71,184		$	76,544
Allowance for originated loans as a percent of:
Total originated loans	1.49		%	1.51		%	1.75		%
Nonperforming loans	103		%	106		%	102		%
Nonperforming loans, less impaired originated loans for which the expected loss has been charged-off	139		%	141		%	143		%

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The following schedule summarizes activity related to the Corporation's allowance for loan losses:

	Three Months Ended
	March 31, 2015			December 31, 2014			March 31, 2014
	(Dollars in thousands)
Allowance for loan losses - beginning of period	$	75,683		$	77,006		$	79,072
Provision for loan losses	1,500			1,500			1,600
Loan charge-offs:
Commercial	(631		)	(947		)	(532		)
Commercial real estate	(782		)	(687		)	(523		)
Real estate construction	(80		)	—			(100		)
Land development	(11		)	(9		)	(54		)
Residential mortgage	(539		)	(405		)	(793		)
Consumer installment	(1,003		)	(1,154		)	(1,126		)
Home equity	(97		)	(558		)	(344		)
Total loan charge-offs	(3,143		)	(3,760		)	(3,472		)
Recoveries of loans previously charged off:
Commercial	207			15			299
Commercial real estate	367			67			282
Real estate construction	—			—			—
Land development	—			372			196
Residential mortgage	47			128			89
Consumer installment	354			341			325
Home equity	241			14			82
Total loan recoveries	1,216			937			1,273
Net loan charge-offs	(1,927		)	(2,823		)	(2,199		)
Allowance for loan losses - end of period	$	75,256		$	75,683		$	78,473
Net loan charge-offs as a percent of average loans (annualized)	0.14		%	0.21		%	0.19		%

The allowance of the acquired loan portfolio was not carried over on the date of acquisition. The acquired loans were recorded at their estimated fair values at the date of acquisition, with the estimated fair values including a component for expected credit losses. Acquired loans are subsequently evaluated for further credit deterioration in loan pools, which consist of loans with similar credit risk characteristics. If an acquired loan pool experiences a decrease in expected cash flows, as compared to those expected at the acquisition date, a portion of the allowance is allocated to acquired loans. There was no allowance needed for the acquired loan portfolio at March 31, 2015. The allowance for loan losses on the acquired loan portfolio was $0.5 million at December 31, 2014 and March 31, 2014.

Deposits

Total deposits were $6.32 billion at March 31, 2015, an increase of $241.4 million, or 4.0%, from total deposits of $6.08 billion at December 31, 2014 and an increase of $1.09 billion, or 20.8%, from total deposits of $5.23 billion at March 31, 2014. The increase in total deposits during the first quarter of 2015 was attributable to a combination of organic deposit growth and a seasonal increase in municipal deposit accounts. The increase in total deposits for the twelve-month period ended March 31, 2015 was attributable to a combination of the Northwestern transaction and organic deposit growth. The organic deposit growth included increases in interest- and noninterest-bearing demand deposit and savings accounts that were partially offset by a decline in certificate of deposit accounts. Interest- and noninterest-bearing demand deposit and savings accounts were $4.99 billion at March 31, 2015, compared to $3.87 billion at March 31, 2014. In comparison, certificate of deposit accounts were $1.33 billion at March 31, 2015, compared to $1.36 billion at March 31, 2014.

It is the Corporation's strategy to develop customer relationships that will drive core deposit growth and stability. The Corporation's competitive position within many of its market areas has historically limited its ability to materially increase core deposits without adversely impacting the weighted average cost of the deposit portfolio. While competition for core deposits remained strong throughout the Corporation's markets during the twelve months ended March 31, 2015, the Corporation's efforts to expand its

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deposit relationships with existing customers, the Corporation's financial strength and a general trend in customers holding more liquid assets have resulted in the Corporation continuing to experience increases in customer deposits.

At March 31, 2015, the Corporation's time deposits, which consist of certificates of deposit, totaled $1.33 billion, of which $737 million have stated maturities during the remainder of 2015. The Corporation expects the majority of these maturing time deposits to be renewed by customers. The following schedule summarizes the scheduled maturities of the Corporation's time deposits as of March 31, 2015:

Maturity Schedule	Amount		Weighted Average Interest Rate
	(Dollars in thousands)
2015 maturities:
Second quarter	$	376,278	0.61	%
Third quarter	203,532		0.76
Fourth quarter	157,195		0.69
2015 maturities	737,005		0.67
2016 maturities	257,468		0.78
2017 maturities	185,105		1.09
2018 maturities	60,927		1.16
2019 maturities	55,409		1.30
2020 maturities and beyond	36,171		1.64
Total time deposits	$	1,332,085	0.82	%

Borrowed Funds

Borrowed funds consist of short-term borrowings, including securities sold under agreements to repurchase with customers, federal funds purchased and Federal Home Loan Bank (FHLB) advances with original maturities of one year or less. Short-term borrowings were $372.2 million, $389.5 million and $361.2 million at March 31, 2015, December 31, 2014 and March 31, 2014, respectively. Short-term borrowings decreased$17.2 million, or 4.4%, during the three months ended March 31, 2015 and increased$11.0 million, or 3.0%, during the twelve months ended March 31, 2015.

Securities sold under agreements to repurchase with customers represent funds deposited by customers, generally on an overnight basis, that are collateralized by investment securities owned by Chemical Bank, as these deposits are not covered by Federal Deposit Insurance Corporation (FDIC) insurance. These funds have been a stable source of liquidity for Chemical Bank, much like its core deposit base, and are generally only provided to customers that have an established banking relationship with Chemical Bank. Securities sold under agreements to repurchase with customers, which are highly rate sensitive, were $372.2 million, $304.5 million and $361.2 million at March 31, 2015, December 31, 2014 and March 31, 2014, respectively. The Corporation's securities sold under agreements to repurchase do not qualify as sales for accounting purposes. The increase in securities sold under agreements to repurchase with customers during the first quarter of 2015 was largely due to $50 million of temporary funds received from one customer of Chemical Bank.

Federal funds purchased represent unsecured borrowings from nonaffiliated third-party financial institutions, generally on an overnight basis, to cover short-term liquidity needs. The Corporation had no federal funds purchased at March 31, 2015 or March 31, 2014. At December 31, 2014, the Corporation had federal funds purchased of $25.0 million.

FHLB advances are borrowings from the Federal Home Loan Bank of Indianapolis that are generally used to fund loans and a portion of the Corporation's investment securities portfolio and are secured by both a blanket security agreement of residential mortgage first lien loans with an aggregate book value equal to at least 145% of the advances and FHLB capital stock owned by Chemical Bank. The carrying value of residential mortgage first lien loans eligible as collateral under the blanket security agreement was $1.04 billion at March 31, 2015. The Corporation had no FHLB advances outstanding at March 31, 2015 or March 31, 2014. The Corporation had short-term FHLB advances outstanding of $60.0 million at December 31, 2014.

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Credit-Related Commitments

The Corporation has credit-related commitments that may impact its liquidity. The following schedule summarizes the Corporation's credit-related commitments and expected expiration dates by period as of March 31, 2015. Because many of these commitments historically have expired without being drawn upon, the total amount of these commitments does not necessarily represent future liquidity requirements of the Corporation.

	Less than 1 year		1-3 years		3-5 years		More than 5 years		Total
	(In thousands)
Unused commitments to extend credit:
Loans to commercial borrowers	$	590,570	$	130,923	$	51,844	$	44,828	$	818,165
Loans to consumer borrowers	85,145		46,737		123,167		20,764		275,813
Total unused commitments to extend credit	675,715		177,660		175,011		65,592		1,093,978
Undisbursed loan commitments	332,128		—		—		—		332,128
Standby letters of credit	35,505		2,203		344		150		38,202
Total credit-related commitments	$	1,043,348	$	179,863	$	175,355	$	65,742	$	1,464,308

Undisbursed loan commitments at March 31, 2015 included $37 million of residential mortgage loans that were expected to be sold in the secondary market.

Capital

Total shareholders' equity was $810.5 million at March 31, 2015, compared to $797.1 million at December 31, 2014 and $705.6 million at March 31, 2014. The increase in shareholders' equity from March 31, 2014 was primarily attributable to the Corporation raising $76.2 million of capital in the second quarter of 2014. Total shareholders' equity as a percentage of total assets was 10.7% at March 31, 2015, compared to 10.9% at December 31, 2014 and 11.1% at March 31, 2014. The Corporation's tangible equity, which is defined as total shareholders' equity less goodwill and other acquired intangible assets, totaled $615.5 million, $601.3 million and $580.6 million at March 31, 2015, December 31, 2014 and March 31, 2014, respectively. The Corporation's tangible equity to assets ratio was 8.4% at both March 31, 2015 and December 31, 2014, compared to 9.3% at March 31, 2014.

Shelf Registration

On June 12, 2014, the Corporation filed an automatic shelf registration statement on Form S-3 with the Securities and Exchange Commission (SEC) for an indeterminate amount of securities, which became immediately effective. The shelf registration statement provides the Corporation with the ability to raise capital, subject to SEC rules and limitations, if the board of directors of the Corporation decides to do so.

Basel III

In July 2013, the Reserve Board and FDIC approved final rules implementing the Basel Committee on Banking Supervision's (BCBS) capital guidelines for U.S. banks. The final rules, which are subject to a multi-year phase-in period, began for the Corporation and Chemical Bank on January 1, 2015. Under the final rules, minimum requirements increase for both the quantity and quality of capital held by the Corporation and Chemical Bank. The final rules include a new minimum common equity Tier 1 capital to risk-weighted assets (CET) ratio of 4.5%, in addition to raising the minimum ratio of Tier 1 capital to risk-weighted assets from 4.0% to 6.0% and requiring a minimum leverage ratio of 4.0%. The final rules also establish a new capital conservation buffer of 2.5% of risk-weighted assets, which is phased-in over a four-year period beginning January 1, 2016.

The Corporation and Chemical Bank both continue to maintain strong capital positions, which significantly exceeded the minimum levels prescribed by the Board of Governors of the Federal Reserve System (Reserve Board) at March 31, 2015, as shown in the following schedule:

	Leverage		CET Risk-Based Capital		Tier 1 Risk-Based Capital		Total Risk-Based Capital
Actual Capital Ratios:
Chemical Financial Corporation	9.1	%	11.8	%	11.8	%	13.0	%
Chemical Bank	8.4		10.9		10.9		12.1
Minimum required for capital adequacy purposes	4.0		4.5		6.0		8.0
Minimum required for “well-capitalized” capital adequacy purposes	5.0		6.5		8.0		10.0

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Results of Operations

Net Interest Income

Net interest income is the difference between interest income on earning assets, such as loans, investment and non-marketable equity securities and interest-bearing deposits with the Federal Reserve Bank (FRB) and other banks, and interest expense on liabilities, such as deposits and borrowings. Net interest income, on a fully taxable equivalent (FTE) basis, is the difference between interest income and interest expense adjusted for the tax benefit received on tax-exempt commercial loans and investment securities. Net interest margin is calculated by dividing net interest income (FTE) by average interest-earning assets, annualized as applicable. Net interest spread is the difference between the average yield on interest-earning assets and the average cost of interest-bearing liabilities. Because noninterest-bearing sources of funds, or free funds (principally demand deposits and shareholders' equity), also support earning assets, the net interest margin exceeds the net interest spread.

Net interest income (FTE) was $60.8 million in the first quarter of 2015, compared to $51.2 million in the first quarter of 2014 and $59.8 million in the fourth quarter of 2014. The presentation of net interest income on an FTE basis is not in accordance with GAAP but is customary in the banking industry. This non-GAAP measure ensures comparability of net interest income arising from both taxable and tax-exempt loans and investment securities. The adjustments to determine net interest income (FTE) were $1.6 million, $1.5 million and $1.5 million for each of the three-month periods ended March 31, 2015, March 31, 2014 and December 31, 2014, respectively. These adjustments were computed using a 35% federal income tax rate.

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Average Balances, Fully Tax Equivalent (FTE) Interest and Effective Yields and Rates*

The following schedule presents the average daily balances of the Corporation's major categories of assets and liabilities, interest income and expense on an FTE basis, average interest rates earned and paid on the assets and liabilities, net interest income (FTE), net interest spread and net interest margin for the three months ended March 31, 2015, March 31, 2014, and December 31, 2014.

	Three Months Ended
	March 31, 2015						March 31, 2014						December 31, 2014
	Average Balance		Interest (FTE)		Effective Yield/ Rate*		Average Balance		Interest (FTE)		Effective Yield/ Rate*		Average Balance		Interest (FTE)		Effective Yield/ Rate*
ASSETS	(Dollars in Thousands)
Interest-Earning Assets:
Loans**	$	5,706,053	$	58,660	4.16	%	$	4,696,415	$	49,744	4.28	%	$	5,426,664	$	57,680	4.22	%
Taxable investment securities	734,890		2,307		1.26		691,861		2,383		1.38		712,516		2,322		1.30
Tax-exempt investment securities	331,878		2,932		3.53		257,173		2,615		4.07		306,446		2,832		3.70
Other interest-earning assets	29,438		198		2.73		25,572		238		3.77		27,139		415		6.07
Interest-bearing deposits with the FRB and other banks	118,475		122		0.42		189,408		125		0.27		85,382		89		0.41
Total interest-earning assets	6,920,734		64,219		3.75		5,860,429		55,105		3.80		6,558,147		63,338		3.84
Less: Allowance for loan losses	75,880						79,323						77,053
Other Assets:
Cash and cash due from banks	138,308						120,168						134,309
Premises and equipment	97,105						74,762						93,111
Interest receivable and other assets	320,991						234,533						299,365
Total Assets	$	7,401,258					$	6,210,569					$	7,007,879
LIABILITIES AND SHAREHOLDERS' EQUITY
Interest-Bearing Liabilities:
Interest-bearing demand deposits	$	1,506,953	$	324	0.09	%	$	1,212,534	$	287	0.10	%	$	1,368,314	$	329	0.10	%
Savings deposits	1,777,344		370		0.08		1,415,119		316		0.09		1,613,338		367		0.09
Time deposits	1,332,698		2,658		0.81		1,321,119		3,142		0.96		1,306,712		2,718		0.83
Short-term borrowings	342,128		98		0.12		327,905		121		0.15		337,681		107		0.13
Long-term FHLB advances and subordinated debt obligations	—		—		—		—		—		—		6,724		42		2.48
Total interest-bearing liabilities	4,959,123		3,450		0.28		4,276,677		3,866		0.37		4,632,769		3,563		0.31
Noninterest-bearing deposits	1,587,100		—		—		1,193,504		—		—		1,519,823		—		—
Total deposits and borrowed funds	6,546,223		3,450		0.21		5,470,181		3,866		0.29		6,152,592		3,563		0.23
Interest payable and other liabilities	53,597						38,510						50,959
Shareholders’ equity	801,438						701,878						804,328
Total Liabilities and Shareholders’ Equity	$	7,401,258					$	6,210,569					$	7,007,879
Net Interest Spread (average yield earned minus average rate paid)					3.47	%					3.43	%					3.53	%
Net Interest Income (FTE)			$	60,769					$	51,239					$	59,775
Net Interest Margin (Net Interest Income (FTE) divided by total average interest-earning assets)					3.55	%					3.53	%					3.62	%
* Fully taxable equivalent (FTE) basis using a federal income tax rate of 35%.
** Nonaccrual loans and loans held-for-sale are included in average balances reported and are included in the calculation of yields. Also, tax equivalent interest includes net loan fees.

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Net interest income (FTE) of $60.8 million in the first quarter of 2015 was $9.5 million, or 18.6%, higher than net interest income (FTE) of $51.2 million in the first quarter of 2014, with the increase primarily attributable to an increase of $1.01 billion in the average volume of loans outstanding, including the impact of the $475 million of loans acquired in the acquisition of Northwestern on October 31, 2014, and the favorable impact of time deposits repricing lower during the twelve months ended March 31, 2015, both of which were partially offset by the unfavorable impact of loans and investment securities repricing during the twelve months ended March 31, 2015. The net interest margin was 3.55% in the first quarter of 2015, compared to 3.53% in the first quarter of 2014. The average yield on interest-earning assets decreased slightly to 3.75% in the first quarter of 2015, from 3.80% in the first quarter of 2014, with the decrease primarily attributable to the repricing of loans at lower interest rates. The average yield on loans decreased 12 basis points to 4.16% in the first quarter of 2015 from 4.28% in the first quarter of 2014. The average cost of interest-bearing liabilities decreased to 0.28% in the first quarter of 2015, from 0.37% in the first quarter of 2014, with the decrease primarily attributable to the repricing of time deposits at lower interest rates as they matured and were renewed in the continued low interest rate environment.

Net interest income (FTE) of $60.8 million in the first quarter of 2015 was $1.0 million, or 1.7%, higher than net interest income (FTE) of $59.8 million in the fourth quarter of 2014, with the increase primarily attributable to an increase of $279 million in the average volume of loans outstanding. The net interest margin of 3.55% in the first quarter of 2015 was slightly lower than 3.62% in the fourth quarter of 2014 as the Corporation receives a higher level of loan fees, which are included in net interest income, in the fourth quarter of the year. The average yield on interest-earning assets decreased 9 basis points to 3.75% in the first quarter of 2015, from 3.84% in the fourth quarter of 2014. The average cost of interest-bearing liabilities decreased slightly to 0.28% in the first quarter of 2015 from 0.31% in the fourth quarter of 2014.

Changes in the Corporation's net interest income are influenced by a variety of factors, including changes in the level and mix of interest-earning assets and interest-bearing liabilities, current and prior years' interest rate changes, the level and direction of interest rates, the difference between short-term and long-term interest rates (the steepness of the yield curve) and the general strength of the economies in the Corporation's markets. Risk management plays an important role in the Corporation's level of net interest income. The ineffective management of credit risk, and more significantly interest rate risk, can adversely impact the Corporation's net interest income. Management monitors the Corporation's consolidated statement of financial position to reduce the potential adverse impact on net interest income caused by significant changes in interest rates. The Corporation's policies in this regard are further discussed under the subheading “Market Risk.”

The Reserve Board influences the general market rates of interest, including the deposit and loan rates offered by many financial institutions. The prime interest rate, which is the rate offered on loans to borrowers with strong credit, was 3.25% at the end of 2008 and has remained at this historically low rate through March 31, 2015. The prime interest rate has historically been 300 basis points higher than the federal funds rate. The majority of the Corporation's variable interest rate loans in the commercial loan portfolio are tied to the prime rate.

The Corporation is primarily funded by core deposits, which is a lower-cost funding base than wholesale funding and historically has had a positive impact on the Corporation's net interest income and net interest margin. The Corporation anticipates that the loan portfolio will grow at a higher rate than its core deposits, and therefore, expects wholesale funding to provide a portion of its funding base in the future. Based on the current historically low level of market interest rates and the Corporation's current low levels of interest rates on its core deposit transaction accounts, further market interest rate reductions would likely not result in a significant decrease in interest expense.

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Volume and Rate Variance Analysis

The following schedule allocates the dollar change in net interest income (FTE) between the portion attributable to changes in the average volume of interest-earning assets and interest-bearing liabilities, including changes in the mix of assets and liabilities, and changes in average interest rates earned and paid, for the three months ended March 31, 2015, compared to the three months ended March 31, 2014 and December 31, 2014.

	Three Months Ended March 31, 2015
	Compared to Three Months Ended March 31, 2014									Compared to Three Months Ended December 31, 2014
	Increase (Decrease) Due to Changes in									Increase (Decrease) Due to Changes in
	Average Volume**			Average Yield/Rate**			Combined Increase/ (Decrease)			Average Volume**			Average Yield/Rate**			Combined Increase/ (Decrease)
	(In Thousands)
Changes in Interest Income on Interest-Earning Assets:
Loans	$	10,546		$	(1,630	)	$	8,916		$	2,241		$	(1,261	)	$	980
Taxable investment securities/other assets	166			(282		)	(116		)	101			(333		)	(232		)
Tax-exempt investment securities	694			(377		)	317			232			(132		)	100
Interest-bearing deposits with the FRB and other banks	(57		)	54			(3		)	31			2			33
Total change in interest income on interest-earning assets	11,349			(2,235		)	9,114			2,605			(1,724		)	881
Changes in Interest Expense on Interest-Bearing Liabilities:
Interest-bearing demand deposits	56			(19		)	37			15			(20		)	(5		)
Savings deposits	78			(24		)	54			28			(25		)	3
Time deposits	31			(515		)	(484		)	36			(96		)	(60		)
Short-term borrowings	15			(38		)	(23		)	2			(11		)	(9		)
Subordinated debt	—			—			—			(42		)	—			(42		)
Total change in interest expense on interest-bearing liabilities	180			(596		)	(416		)	39			(152		)	(113		)
Total Change in Net Interest Income (FTE)*	$	11,169		$	(1,639	)	$	9,530		$	2,566		$	(1,572	)	$	994
* Taxable equivalent basis using a federal income tax rate of 35%.
** The change in interest income and interest expense due to both volume and rate has been allocated to the volume and rate changes in proportion to the relationship of the absolute dollar amounts of the change in each.

Provision for Loan Losses

The provision for loan losses (provision) is an increase to the allowance, as determined by management, to provide for probable losses inherent in the originated loan portfolio and for impairment of pools of acquired loans that results from the Corporation experiencing a decrease, if any, in expected cash flows of acquired loans during each reporting period. The provision was $1.5 million in the first quarter of 2015, compared to $1.6 million in the first quarter of 2014 and $1.5 million in the fourth quarter of 2014.

The Corporation experienced net loan charge-offs of $1.9 million in the first quarter of 2015, compared to $2.2 million in the first quarter of 2014 and $2.8 million in the fourth quarter of 2014. Net loan charge-offs as a percentage of average loans (annualized) were 0.14% in the first quarter of 2015, compared to 0.19% in the first quarter of 2014 and 0.21% in the fourth quarter of 2014. Net loan charge-offs in the commercial loan portfolio totaled $0.9 million in the first quarter of 2015, compared to $0.4 million in the first quarter of 2014 and $1.2 million in the fourth quarter of 2014. The Corporation's commercial loan portfolio's net loan charge-offs were not concentrated in any one industry or borrower. Net loan charge-offs in the consumer loan portfolio totaled $1.0 million in the first quarter of 2015, compared to $1.8 million in the first quarter of 2014 and $1.6 million in the fourth quarter of 2014.

The Corporation's provision of $1.5 million in the first quarter of 2015 was $0.4 millionlower than net loan charge-offs for the quarter. In addition, the provision in the first quarter of 2015 was $0.1 millionlower than the first quarter of 2014, although unchanged from the fourth quarter of 2014. The Corporation's quarterly provision for loan losses remained consistent throughout 2014 and the first quarter of 2015, despite significant growth in its loan portfolio, due to the continued improvement in the overall credit quality of the loan portfolio including decreases in both net loan charge-offs and nonperforming loans and no significant changes in risk grade categories of the commercial loan portfolio.

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Noninterest Income

The following summarizes the major components of noninterest income:

	Three Months Ended
	March 31, 2015		March 31, 2014		December 31, 2014
	(In thousands)
Service charges and fees on deposit accounts	$	5,916	$	4,930	$	6,386
Wealth management revenue	5,071		3,631		4,696
Electronic banking fees	4,572		3,112		3,706
Mortgage banking revenue	1,403		794		1,590
Other fees for customer services	901		791		1,301
Title insurance commissions	517		291		359
Gain on sale of investment securities	579		—		—
Other	316		167		189
Total noninterest income	$	19,275	$	13,716	$	18,227

Noninterest income was $19.3 million in the first quarter of 2015, compared to $13.7 million in the first quarter of 2014 and $18.2 million in the fourth quarter of 2014. Noninterest income in the first quarter of 2015 was $5.6 millionhigher than the first quarter of 2014, with the increase attributable to all major categories of noninterest income that was, in part, due to the Northwestern transaction. Noninterest income in the first quarter of 2015 was $1.0 millionhigher than the fourth quarter of 2014, with the increase primarily attributable to higher wealth management revenue and electronic banking revenue, which were partially offset by lower service charges and fees on deposit accounts. Noninterest income in the first quarter of 2015 included $0.6 million of gains related to the sale of available-for-sale investment securities. The majority of these investment securities were obligations from municipalities which were located outside of the Corporation's geographic market.

Service charges and fees on deposit accounts, which include overdraft/non-sufficient funds fees, checking account service fees and other deposit account charges, were $5.9 million in the first quarter of 2015, an increase of $1.0 million, or 20%, from the first quarter of 2014 and a decrease of $0.5 million, or 7.4%, from the fourth quarter of 2014. The increase in service charges and fees on deposit accounts in the first quarter of 2015, compared to the first quarter of 2014, was due primarily to additional fees earned as a result of the Northwestern transaction. Overdraft/non-sufficient funds fees included in service charges and fees on deposit accounts were $4.3 million in the first quarter of 2015, compared to $3.9 million in the first quarter of 2014 and $4.8 million in the fourth quarter of 2014.

Wealth management revenue is comprised of investment fees that are generally based on the market value of assets within a trust account, custodial account fees and fees from the sale of investment products. Volatility in the equity and bond markets impacts the market value of trust assets and related investment fees. Wealth management revenue was $5.1 million in the first quarter of 2015, an increase of $1.4 million, or 40%, over the first quarter of 2014 and an increase of $0.4 million, or 8.0%, from the fourth quarter of 2014. The increase in wealth management revenue in the first quarter of 2015, compared to the first quarter of 2014, was due primarily to additional fees earned as a result of the Northwestern transaction. Fees from the sales of investment products totaled $0.9 million in the first quarter of 2015, compared to $0.8 million in the first quarter of 2014 and $0.9 million in the fourth quarter of 2014.

Electronic banking fees, which represent income earned by the Corporation from ATM transactions, debit card activity and internet banking fees, were $4.6 million in the first quarter of 2015, an increase of $1.5 million, or 47%, from the first quarter of 2014 and an increase of $0.9 million, or 23%, from the fourth quarter of 2014. The increase in electronic banking fees in the first quarter of 2015, compared to the first quarter of 2014, was due primarily to additional fees earned as a result of the Northwestern transaction, while the increase in the first quarter of 2015, compared to the fourth quarter of 2014, was due to higher fees earned based on volume and lower costs associated with the Corporation's debit card Preferred Rewards program, which are recognized as a reduction to debit card fee income when earned by customers.

Mortgage banking revenue (MBR) includes revenue from originating, selling and servicing residential mortgage loans for the secondary market. MBR was $1.4 million in the first quarter of 2015, an increase of $0.6 million, or 77%, from the first quarter of 2014 and a decrease of $0.2 million, or 12%, from the fourth quarter of 2014. The increase in MBR in the first quarter of 2015, compared to the first quarter of 2014, was due primarily to an increase in the volume of loans sold in the secondary market. The Corporation sold $53 million of residential mortgage loans in the secondary market in the first quarter of 2015, compared to $21 million in the first quarter of 2014 and $47 million in the fourth quarter of 2014.

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The Corporation sells residential mortgage loans in the secondary market on both a servicing retained and servicing released basis. These sales include the Corporation entering into residential mortgage loan sale agreements with buyers in the normal course of business. The agreements contain provisions that include various representations and warranties regarding the origination, characteristics and underwriting of the mortgage loans. The recourse of the buyer may result in either indemnification of any loss incurred by the buyer or a requirement for the Corporation to repurchase a loan that the buyer believes does not comply with the representations included in the loan sale agreement. Repurchase demands and loss indemnifications received by the Corporation are reviewed by a senior officer on a loan-by-loan basis to validate the claim made by the buyer. The Corporation maintains a reserve for probable losses expected to be incurred from loans previously sold in the secondary market. This contingent liability is based on trends in repurchase and indemnification requests, actual loss experience, information requests, known and inherent risks in the sale of loans in the secondary market and current economic conditions. For the three months ended March 31, 2015, the Corporation incurred loan losses and buyer indemnification expenses of $0.2 million related to 9 residential mortgage loans that had been previously sold in the secondary market. During the three years preceding 2015, the Corporation incurred loan losses and buyer indemnification expenses totaling $0.9 million related to 20 residential mortgage loans that had been previously sold in the secondary market. The Corporation records losses resulting from the repurchase of loans previously sold in the secondary market, as well as adjustments to estimates of future probable losses, as part of its MBR in the period incurred. The Corporation's reserve for probable losses was $2.8 million at March 31, 2015, compared to $3.0 million at December 31, 2014 and $1.5 million at March 31, 2014. The increase in the reserve for probable losses from March 31, 2014 was attributable to the reserve for probable losses associated with the servicing portfolio acquired in the Northwestern transaction.

Operating Expenses

The following summarizes the major categories of operating expenses:

	Three Months Ended
	March 31, 2015		March 31, 2014		December 31, 2014
	(In thousands)
Salaries and wages	$	23,756	$	19,533	$	24,528
Employee benefits	5,512		4,651		5,761
Occupancy	4,426		4,374		4,201
Equipment and software	4,738		3,461		4,272
Outside processing and service fees	3,942		2,668		3,752
Professional fees	1,719		1,293		2,863
FDIC insurance premiums	1,225		1,061		1,119
Postage and express mail	856		879		901
Intangible asset amortization	791		445		693
Training, travel and other employee expenses	766		628		924
Advertising and marketing	764		676		734
Telephone	540		467		566
Supplies	519		445		582
Donations	308		366		158
Credit-related expenses	133		366		376
Other	1,025		869		1,186
Total operating expenses	$	51,020	$	42,182	$	52,616

Operating expenses were $51.0 million in the first quarter of 2015, compared to $42.2 million in the first quarter of 2014 and $52.6 million in the fourth quarter of 2014. Operating expenses included nonrecurring transaction-related expenses attributable to the recently completed acquisition of Monarch and the pending acquisition of Lake Michigan of $1.4 million in the first quarter of 2015,while nonrecurring transaction-related expenses attributable to the October 31, 2014 acquisition of Northwestern were $0.3 million in the first quarter of 2014 and $4.1 million in the fourth quarter of 2014. Excluding these nonrecurring expenses, operating expenses in the first quarter of 2015 were $7.8 million, or 19%, higher than the first quarter of 2014 and $1.2 million, or 2.4%, higher than the fourth quarter of 2014, with the increases primarily attributable to incremental costs associated with the Northwestern transaction.

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Salaries and wages of $23.8 million in the first quarter of 2015increased$4.2 million, or 21.6%, over the first quarter of 2014 due primarily to incremental costs associated with the Northwestern transaction, in addition to merit and inflationary salary adjustments that took effect at the beginning of 2015. Salaries and wages included $1.6 million of nonrecurring transaction-related expenses in the fourth quarter of 2014. Excluding these nonrecurring expenses, salaries and wages in the first quarter of 2015increased$0.8 million, or 3.4%, over the fourth quarter of 2014 due to incremental costs associated with the Northwestern transaction and annual merit salary increases that became effective January 1, 2015. Performance-based compensation expense was $2.5 million in the first quarter of 2015, compared to $1.9 million in the first quarter of 2014 and $2.4 million in the fourth quarter of 2014.

Employee benefit costs of $5.5 million in the first quarter of 2015increased$0.9 million, or 18.5%, over the first quarter of 2014, compared to a decrease of $0.2 million, or 4.3%, from the fourth quarter of 2014. The increase in employee benefit costs in the first quarter of 2015, compared to the first quarter of 2014, was attributable to a combination of incremental costs associated with the Northwestern transaction and higher pension expense, which were partially offset by lower group health costs. The decrease in employee benefit costs in the first quarter of 2015, compared to the fourth quarter of 2014, was attributable to lower group health costs, which was partially offset by higher payroll tax expenses, which are highest in the first quarter of the year, and higher pension expense.

Occupancy expenses of $4.4 million in the first quarter of 2015increased$0.1 million, or 1.2%, over the first quarter of 2014, and $0.2 million, or 5.4%, over the fourth quarter of 2014.

Equipment and software expenses included nonrecurring transaction-related expenses of $0.3 million in the first quarter of 2015. Excluding these nonrecurring expenses, equipment and software expense of $4.4 million in the first quarter of 2015 was $0.9 million higher than the first quarter of 2014 and $0.1 million higher than the fourth quarter of 2014. The increase in the first quarter of 2015, compared to the first quarter of 2014, was primarily attributable to incremental costs associated with the Northwestern transaction.

Outside processing and service fees included nonrecurring transaction-related expenses of $0.4 million in the first quarter of 2015 and $0.5 million in the fourth quarter of 2014. Excluding these nonrecurring expenses, outside processing and service fees of $3.6 million in the first quarter of 2015 were $0.9 million higher than the first quarter of 2014 and $0.3 million higher than the fourth quarter of 2014, with the increases primarily attributable to incremental costs associated with the Northwestern transaction.

Professional fees included nonrecurring transaction-related expenses of $0.5 million in the first quarter of 2015, $0.3 million in the first quarter of 2014 and $1.9 million in the fourth quarter of 2014. Excluding these nonrecurring expenses, professional fees of $1.2 million in the first quarter of 2015 were $0.3 million higher than both the first quarter of 2014 and the fourth quarter of 2014.

Credit-related expenses are comprised of other real estate (ORE) net costs and loan collection costs. ORE net costs are comprised of costs to carry ORE, such as property taxes, insurance and maintenance costs, fair value write-downs after a property is transferred to ORE and net gains/losses from the disposition of ORE. Loan collection costs include legal fees, appraisal fees and other costs recognized in the collection of loans with deteriorated credit quality and in the process of foreclosure. Credit-related expenses of $0.1 million in the first quarter of 2015 were $0.2 millionlower than both the first quarter of 2014 and the fourth quarter of 2014. The decrease in credit-related expenses in the first quarter of 2015, compared to the first quarter of 2014, was primarily attributable to higher net gains on the sales of ORE properties, while the decrease in the first quarter of 2015, compared to the fourth quarter of 2014, was attributable to a combination of slightly higher net gains on sales of ORE properties and lower loan collection costs. The Corporation recognized net gains on the sale of ORE properties of $0.6 million in the first quarter of 2015, compared to $0.4 million in both the first quarter of 2014 and the fourth quarter of 2014. ORE operating costs and loan collection costs, combined, were $0.7 million in both the first quarter of 2015 and the first quarter of 2014, compared to $0.8 million in the fourth quarter of 2014.

Income Tax Expense

The Corporation's effective federal income tax rate was 31.2% for the first quarter of 2015, compared to 29.9% and 31.5% for the first quarter of 2014 and the fourth quarter of 2014, respectively. The fluctuations in the Corporation's effective federal income tax rate reflect changes each year in the proportion of interest income exempt from federal taxation, nondeductible interest expense and other nondeductible expenses relative to pretax income and tax credits. The Corporation recorded income tax expense for the three-month periods ended March 31, 2015 and 2014 using its estimate of the effective income tax rate expected for the full year and applied that rate on a year-to-date basis.

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Liquidity

Liquidity measures the ability of the Corporation to meet current and future cash flow needs in a timely manner. Liquidity risk is the adverse impact on net interest income if the Corporation was unable to meet its cash flow needs at a reasonable cost.

Liquidity is managed to ensure stable, reliable and cost-effective sources of funds are available to satisfy deposit withdrawals and lending and investment opportunities. The ability of a financial institution to meet its current financial obligations is a function of its balance sheet structure, its ability to liquidate assets and its access to alternative sources of funds. The Corporation manages its funding needs by maintaining a level of liquid funds through its asset/liability management process. The Corporation's largest sources of liquidity on a consolidated basis are the deposit base that comes from consumer, business and municipal customers within the Corporation's local markets, principal payments on loans, maturing investment securities, cash held at the FRB and unpledged investment securities available-for-sale. Total deposits increased$241 million during the three months ended March 31, 2015 and $1.09 billion during the twelve months ended March 31, 2015. The increase in customer deposits during the twelve months ended March 31, 2015 was primarily attributable to the $794 million of deposits acquired in the Northwestern transaction. The Corporation's loan-to-deposit ratio was 90.2% at March 31, 2015, 93.6% at December 31, 2014 and 90.9% at March 31, 2014. The Corporation had $272 million of cash deposits held at the FRB at March 31, 2015, compared to $38 million at December 31, 2014 and $260 million at March 31, 2014. The increase in interest-bearing balances at the FRB during the first quarter of 2015 was largely attributable to a seasonal increase in municipal customer deposits. At March 31, 2015, the Corporation had unpledged investment securities available-for-sale with an amortized cost of $110 million and available unused wholesale sources of liquidity, including FHLB advances and borrowings from the discount window of the FRB.

Chemical Bank is a member of the FHLB and as such has access to short-term and long-term advances from the FHLB that are generally secured by residential mortgage first lien loans. The Corporation's borrowing availability from the FHLB, based on its FHLB capital stock and subject to certain requirements, was $421 million at March 31, 2015. Chemical Bank can also borrow from the FRB's discount window to meet short-term liquidity requirements. These borrowings are required to be secured by investment securities and/or certain loan types, with each category of assets carrying various borrowing capacity percentages. At March 31, 2015, Chemical Bank maintained an unused borrowing capacity of $61 million with the FRB's discount window based upon pledged collateral as of that date. Chemical Bank also had the ability to borrow an additional $75 million of federal funds from a third-party financial institution at March 31, 2015. It is management's opinion that the Corporation's borrowing capacity could be expanded, if deemed necessary, as Chemical Bank has additional borrowing capacity available at the FHLB that could be used if it increased its investment in FHLB capital stock, and Chemical Bank has a significant amount of additional assets that could be used as collateral at the FRB's discount window.

The Corporation manages its liquidity position to provide the cash necessary to pay dividends to shareholders, invest in new subsidiaries, enter new banking markets, pursue investment opportunities and satisfy other operating requirements. The Corporation's primary source of liquidity is dividends from Chemical Bank.

Federal and state banking laws place certain restrictions on the amount of dividends that a bank may pay to its parent company. During the three months ended March 31, 2015, Chemical Bank paid $7.9 million in cash dividends to the Corporation, and the Corporation paid cash dividends to shareholders of $7.9 million. During 2014, Chemical Bank paid $64.5 million in dividends to the Corporation and the Corporation paid cash dividends to shareholders of $29.5 million. The earnings of Chemical Bank have been the principal source of funds to pay cash dividends to the Corporation's shareholders. Over the long term, cash dividends to shareholders are dependent upon earnings, capital requirements, regulatory restraints and other factors affecting Chemical Bank.

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Market Risk

Market risk is the risk of loss arising from adverse changes in the fair value of financial instruments due primarily to changes in interest rates. Interest rate risk is the Corporation's primary market risk and results from timing differences in the repricing of interest rate sensitive assets and liabilities and changes in relationships between rate indices due to changes in interest rates. The Corporation's net interest income is largely dependent upon the effective management of interest rate risk. The Corporation's goal is to avoid a significant decrease in net interest income, and thus an adverse impact on the profitability of the Corporation, in periods of changing interest rates. Sensitivity of earnings to interest rate changes arises when yields on assets change differently from the interest costs on liabilities. Interest rate sensitivity is determined by the amount of interest-earning assets and interest-bearing liabilities repricing within a specific time period and the magnitude by which interest rates change on the various types of interest-earning assets and interest-bearing liabilities. The management of interest rate sensitivity includes monitoring the maturities and repricing opportunities of interest-earning assets and interest-bearing liabilities. The Corporation's interest rate risk is managed through policies and risk limits approved by the boards of directors of the Corporation and Chemical Bank and an Asset and Liability Committee (ALCO). The ALCO, which is comprised of executive and senior management from various areas of the Corporation and Chemical Bank, including finance, lending, investments and deposit gathering, meets regularly to execute asset and liability management strategies. The ALCO establishes guidelines and monitors the sensitivity of earnings to changes in interest rates. The goal of the ALCO process is to manage the impact on net interest income and the net present value of future cash flows of probable changes in interest rates within authorized risk limits.

The primary technique utilized by the Corporation to measure its interest rate risk is simulation analysis. Simulation analysis forecasts the effects on the balance sheet structure and net interest income under a variety of scenarios that incorporate changes in interest rates, the shape of the Treasury yield curve, interest rate relationships and the mix of assets and liabilities and loan prepayments. These forecasts are compared against net interest income projected in a stable interest rate environment. While many assets and liabilities reprice either at maturity or in accordance with their contractual terms, several balance sheet components demonstrate characteristics that require an evaluation to more accurately reflect their repricing behavior. Key assumptions in the simulation analysis include prepayments on loans, probable calls of investment securities, changes in market conditions, loan volumes and loan pricing, deposit sensitivity and customer preferences. These assumptions are inherently uncertain as they are subject to fluctuation and revision in a dynamic environment. As a result, the simulation analysis cannot precisely forecast the impact of rising and falling interest rates on net interest income. Actual results will differ from simulated results due to many other factors, including changes in balance sheet components, interest rate changes, changes in market conditions and management strategies.

The Corporation's interest rate sensitivity is estimated by first forecasting the next twelve months of net interest income under an assumed environment of constant market interest rates. The Corporation then compares the results of various simulation analyses to the constant interest rate forecast (base case). At March 31, 2015, the Corporation projected the change in net interest income during the next twelve months assuming short-term market interest rates were to uniformly and gradually increase or decrease by up to 200 basis points in a parallel fashion over the entire yield curve during the same time period. Additionally, at March 31, 2015, the Corporation projected the change in net interest income of an immediate 400 basis point increase in market interest rates. The Corporation did not project a 400 basis point decrease in interest rates at March 31, 2015 as the likelihood of a decrease of this size was considered unlikely given prevailing interest rate levels. These projections were based on the Corporation's assets and liabilities remaining static over the next twelve months, while factoring in probable calls and prepayments of certain investment securities and residential mortgage and consumer loans. The ALCO regularly monitors the Corporation's forecasted net interest income sensitivity to ensure that it remains within established limits.

A summary of the Corporation's interest rate sensitivity at March 31, 2015 follows:

	Gradual Change									Immediate Change
Twelve month interest rate change projection (in basis points)	-200		-100		0	+100		+200		+400
Percent change in net interest income vs. constant rates	(5.2	)%	(2.7	)%	—	0.2	%	(0.8	)%	(4.7	)%

At March 31, 2015, the Corporation's model simulations projected that a 100 basis point increase in interest rates would result in a positive variance in net interest income of 0.2% relative to the base case over the next twelve-month period, while 200 and 400 basis point increases in interest rates would result in negative variances in net interest income of 0.8% and 4.7%, respectively, relative to the base case over the next twelve-month period. At March 31, 2015, the Corporation's model simulations also projected that decreases in interest rates of 100 and 200 basis points would result in negative variances in net interest income of 2.7% and 5.2%, respectively, relative to the base case over the next twelve-month period. The likelihood of a decrease in interest rates beyond 100 basis points at March 31, 2015 was considered to be unlikely given prevailing interest rate levels.

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The Corporation's model simulations for a 200 basis point increase resulted in a negative variance in net interest income, relative to the base case, primarily due to the Corporation deploying excess cash and maturing variable-rate investment securities into fixed-rate loans during 2014. While the model simulations projected a negative variance for a 200 basis point increase, the Corporation's net interest income is still projected to be higher if interest rates were to rise 200 basis points due to the higher yield being earned on the funds deployed into loans compared to maintaining these funds at the FRB earning 25 basis points or investing in lower yielding investment securities. The Corporation's model simulations for a 100 basis point increase resulted in a positive variance in net interest income, relative to the base case, primarily due to the Corporation maintaining excess cash, which was largely generated from a seasonal increase in municipal deposits during the first quarter of 2015, at the FRB. The Corporation's model simulations treat excess cash maintained at the FRB as a variable-rate asset.

Future increases in market interest rates are not expected to have a significant immediate favorable impact on the Corporation's net interest income at the time of such increases because of the low percentage of variable interest rate loans in the Corporation's loan portfolio and a large percentage of variable interest rate loans at interest rate floors at March 31, 2015. The percentage of variable interest rate loans, which comprised approximately 24% of the Corporation's loan portfolio at March 31, 2015, has remained relatively consistent during the twelve-month period ended March 31, 2015. Approximately two-thirds of the Corporation's variable interest rate loans were at an interest rate floor with a majority expected to remain at their floor until they mature or market interest rates rise more than 75 basis points.

To reduce the risk of rising interest rates adversely impacting net interest income, the Corporation has positioned its balance sheet to be less liability sensitive by holding some variable rate instruments in its investment securities portfolio. Variable rate investment securities at March 31, 2015 were $156 million, or 15% of total investment securities, compared to $168 million, or 16% of total investment securities at December 31, 2014 and $221 million, or 24% of total investment securities, at March 31, 2014. The decline in variable rate investment securities during the twelve months ended March 31, 2015 is largely due to the Corporation utilizing maturing investment securities to partially fund 2014 loan growth.

Item 3. Quantitative and Qualitative Disclosures About Market Risk

Information concerning quantitative and qualitative disclosures about market risk is contained in the discussion regarding interest rate risk and sensitivity under the captions “Liquidity” and “Market Risk” herein and in the Corporation's Annual Report on Form 10-K for the year ended December 31, 2014 and is here incorporated by reference.

Since December 31, 2014, the Corporation does not believe that there has been a material change in the nature or categories of the Corporation's primary market risk exposure, or the particular markets that present the primary risk of loss to the Corporation. As of the date of this report, the Corporation does not know of or expect there to be any material change in the general nature of its primary market risk exposure in the near term. The methods by which the Corporation manages its primary market risk exposure, as described in its Annual Report on Form 10-K for the year ended December 31, 2014, have not changed materially during the current year. As of the date of this report, the Corporation does not expect to make material changes in those methods in the near term. The Corporation may change those methods in the future to adapt to changes in circumstances or to implement new techniques.

The Corporation's market risk exposure is mainly comprised of its vulnerability to interest rate risk. Prevailing interest rates and interest rate relationships are largely determined by market factors that are beyond the Corporation's control. All information provided in response to this item consists of forward-looking statements. Reference is made to the section captioned “Forward-Looking Statements” in this report for a discussion of the limitations on the Corporation's responsibility for such statements. In this discussion, “near term” means a period of one year following the date of the most recent consolidated statement of financial position contained in this report.

Item 4. Controls and Procedures

An evaluation was performed under the supervision and with the participation of the Corporation's management, including the Chief Executive Officer and Chief Financial Officer, of the effectiveness of the design and operation of the Corporation's disclosure controls and procedures as of the end of the period covered by this report. Based on and as of the time of that evaluation, the Corporation's management, including the Chief Executive Officer and Chief Financial Officer, concluded that the Corporation's disclosure controls and procedures were effective to ensure that information required to be disclosed by the Corporation in the reports it files or submits under the Exchange Act is recorded, processed, summarized and reported, within the time periods specified in the Commission's rules and forms. There was no change in the Corporation's internal control over financial reporting that occurred during the three months ended March 31, 2015 that has materially affected, or that is reasonably likely to materially affect, the Corporation's internal control over financial reporting.

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Part II. Other Information

Item 1A. Risk Factors

Information concerning risk factors is contained in the discussion under "Risk Factors" (including the risk factors under the heading "Risk Factors") in the Corporation's Prospectus and Proxy Statement related to its acquisition of Monarch Community Bancorp, Inc., dated February 5, 2015, and the Corporation's Prospectus and Proxy Statement related to its pending acquisition of Lake Michigan Financial Corporation, dated March 25, 2015 (both of which are here incorporated by reference), and in Item 1A, “Risk Factors,” in the Corporation's Annual Report on Form 10-K for the year ended December 31, 2014. As of the date of this report, the Corporation does not believe that there has been a material change in the nature or categories of the Corporation's risk factors, as compared to the information disclosed in the Corporation's Prospectus and Proxy Statement, dated February 5, 2015, the Corporation's Prospectus and Proxy Statement dated March 25, 2015, or in the Corporation's Annual Report on Form 10-K for the year ended December 31, 2014.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

The following schedule summarizes the Corporation's total monthly share repurchase activity for the three months ended March 31, 2015:

	Issuer Purchases of Equity Securities
Period Beginning on First Day of Month Ended	Total Number of Shares Purchased (1)	Average Price Paid Per Share		Total Number of Shares Purchased as Part of Publicly Announced  Plans or Programs	Maximum Number of Shares that May Yet Be Purchased Under Plans or Programs
January 31, 2015	758	$	28.93	—	500,000
February 28, 2015	30,199	30.09		—	500,000
March 31, 2015	17,448	30.94		—	500,000
Total	48,405	$	30.38	—

(1) Represents shares delivered or attested in satisfaction of the exercise price and/or tax withholding obligations by employees who received shares of the Corporation's common stock under the Corporation's share-based compensation plans, as these plans permit employees to use the Corporation's stock to satisfy such obligations based on the market value of the stock on the date of exercise or date of vesting, as applicable.

In January 2008, the board of directors of the Corporation authorized the repurchase of up to 500,000 shares of the Corporation's common stock in the open market. The repurchased shares are available for later reissuance in connection with potential future stock dividends, the Corporation's dividend reinvestment plan, employee benefit plans and other general corporate purposes. In November 2011, the board of directors of the Corporation reaffirmed the stock buy-back authorization with the qualification that the shares may only be repurchased if the share price is below the tangible book value per share of the Corporation’s common stock at the time of the repurchase. No shares have been repurchased under the Corporation's Common Stock Repurchase Program since the authorization.

77

Item 6. Exhibits

Exhibits. The following exhibits are filed as part of this report on Form 10-Q:

Exhibit Number	Document
2.1	Agreement and Plan of Merger, dated March 10, 2014. Previously filed as Exhibit 2.1 to the registrant's Current Report on Form 8-K dated March 10, 2014, filed with the SEC on March 11, 2014. Here incorporated by reference.
2.2	Agreement and Plan of Merger, dated January 5, 2015. Previously filed as Exhibit 2.1 to the registrant's Current Report on Form 8-K dated January 5, 2015, filed with the SEC on January 6, 2015. Here incorporated by reference.
3.1	Restated Articles of Incorporation.
3.2	Bylaws. Previously filed as Exhibit 3.2 to the registrant’s Annual Report on Form 10-K for the year ended December 31, 2013, filed with the SEC on February 26, 2014. Here incorporated by reference.
4.1	Restated Articles of Incorporation. Exhibit 3.1 is here incorporated by reference.
4.2	Bylaws. Exhibit 3.2 is here incorporated by reference.
31.1	Certification of Chief Executive Officer.
31.2	Certification of Chief Financial Officer.
32.1	Certification pursuant to 18 U.S.C. §1350.
101.1	Interactive Data File.

78

Signatures

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

		CHEMICAL FINANCIAL CORPORATION
Date:	April 30, 2015	By:	/s/ David B. Ramaker
			David B. Ramaker
			Chairman of the Board, Chief Executive Officer and President
			(Principal Executive Officer)
Date:	April 30, 2015	By:	/s/ Lori A. Gwizdala
			Lori A. Gwizdala
			Executive Vice President, Chief Financial Officer and Treasurer
			(Principal Financial and Accounting Officer)

79

Exhibit Index

Exhibits. The following exhibits are filed as part of this report on Form 10-Q:

Exhibit Number	Document
2.1	Agreement and Plan of Merger, dated March 10, 2014. Previously filed as Exhibit 2.1 to the registrant's Current Report on Form 8-K dated March 10, 2014, filed with the SEC on March 11, 2014. Here incorporated by reference.
2.2	Agreement and Plan of Merger, dated January 5, 2015. Previously filed as Exhibit 2.1 to the registrant's Current Report on Form 8-K dated January 5, 2015, filed with the SEC on January 6, 2015. Here incorporated by reference.
3.1	Restated Articles of Incorporation.
3.2	Bylaws. Previously filed as Exhibit 3.2 to the registrant’s Annual Report on Form 10-K for the year ended December 31, 2013, filed with the SEC on February 26, 2014. Here incorporated by reference.
4.1	Restated Articles of Incorporation. Exhibit 3.1 is here incorporated by reference.
4.2	Bylaws. Exhibit 3.2 is here incorporated by reference.
31.1	Certification of Chief Executive Officer.
31.2	Certification of Chief Financial Officer.
32.1	Certification pursuant to 18 U.S.C. §1350.
101.1	Interactive Data File.

80

EX-3.1

EXHIBIT 3.1

RESTATED ARTICLES OF INCORPORATION

OF

CHEMICAL FINANCIAL CORPORATION

(As Amended Through April 23, 2015)

1.These Restated Articles of Incorporation are executed pursuant to the provisions of Sections 641-657, Act 284, Public Acts of 1972.

2.The present name of the Corporation is Chemical Financial Corporation; and the Corporation has had no other former name.

3.The date of filing the original Articles of Incorporation was August 27, 1973.

4.The following Restated Articles of Incorporation supersede the original Articles of Incorporation as amended, and shall be the Articles of Incorporation of the Corporation:

Article I

The name of the Corporation is CHEMICAL FINANCIAL CORPORATION

Article II

The purpose or purposes for which the Corporation is organized is to engage in any activity within the purposes for which corporations may be organized under the Business Corporation Act of Michigan.

Article III

The total authorized capital stock of the Corporation is 62,000,000 shares of stock divided into two classes, as follows:

A.	60,000,000 shares of common stock, par value $1.00 per share; and
B.	2,000,000 shares of preferred stock, no par value.

1

The following provisions apply to the authorized capital stock of the corporation:

1. Provisions Applicable to Common Stock.

a.      No Preference. None of the shares of common stock are entitled to any preferences, and each share of common stock is equal to every other share of common stock in every respect.

b.      Dividends. After payment or declaration of full dividends on all shares having a priority over the common stock as to dividends, and after making all required sinking or retirement fund payments, if any, on all classes of preferred stock and on any other stock of the corporation ranking with priority as to dividends or assets over the common stock, dividends on the shares of common stock may be declared and paid, but only when and as determined by the board of directors.

c.      Rights on Liquidation. On any liquidation, dissolution or winding up of the affairs of the corporation, after payment or setting aside of the full preferential amounts to which holders of all shares having priority over the common stock are entitled, the holders of the common stock will be entitled to receive pro rata all the remaining assets of the corporation available for distribution to shareholders. The board of directors may distribute in kind to the holders of common stock the remaining assets of the corporation or may sell, transfer or otherwise dispose of all or any part of the remaining assets to any person and may sell all or any part of the consideration so received and distribute any balance thereof in kind to holders of common stock. The merger or consolidation of the corporation into or with any other corporation, or the merger or consolidation of any other corporation into it, or any purchase or redemption of shares of stock of the corporation of any class, will not be deemed to be a dissolution, liquidation or winding up of the corporation for the purposes of this paragraph.

d.      Voting. At all meetings of shareholders of the corporation, the holders of the common stock are entitled to one vote for each share of common stock held by them respectively.

2. Provisions Applicable To Preferred Stock.

a.      Provisions to be Fixed by the Board of Directors. The board of directors is expressly authorized at any time, and from time to time, to provide for the issuance of shares of preferred stock in one or more series, each having the designations and relative voting, distribution, dividend, liquidation, and other rights, preferences, and limitations, consistent with the Michigan Business Corporation Act, as amended, as are stated in the resolution or resolutions providing for the issuance of shares of preferred stock adopted by the board of directors, and as are not stated in these Restated Articles of Incorporation, or any amendments thereto, including (without limiting the generality of the foregoing) the following:

2

(1)    The distinctive designation and number of shares comprising the series, which number may (except where other-wise provided by the board of directors in creating the series) be increased or decreased (but not below the number of shares then issued and outstanding) from time to time by action of the board of directors.

(2)    The stated value of the shares of the series.

(3)    The dividend rate or rates on the shares of the series and the relation which dividends will bear to the dividends payable on any other class of capital stock or on any other series of preferred stock, the terms and conditions upon which and the periods in respect of which dividends will be pay-able, whether and upon what conditions dividends will be cumulative and, if cumulative, the date or dates from which dividends will accumulate.

(4)    Whether the shares of the series are redeemable and, if redeemable, whether redeemable for cash, property or rights, including securities of any other corporation, and whether redeemable at the option of the holder or the corporation or upon the happening of a specified event, the limitations and restrictions with respect to the redemption, the time or times when, the price or prices or rate or rates at which, the adjustments with which and the manner in which such shares are redeemable, including the manner of selecting shares of the series for redemption if less than all shares are to be redeemed.

(5)    The rights to which the holders of shares of the series are entitled, and the preferences, if any, over any other series (or of any other series over the series), upon the voluntary or involuntary liquidation, dissolution, distribution or winding up of the corporation, which rights may vary depending on whether the liquidation, dissolution, distribution or winding up is voluntary or involuntary, and, if voluntary, may vary at different dates.

(6)    Whether the shares of the series are subject to the operation of a purchase, retirement or sinking fund and, if so, whether and upon what conditions the fund will be cumulative or noncumulative, the extent to which and the manner in which the fund will be applied to the purchase or redemption of the shares of the series for retirement or to other corporation purposes and the terms and provisions relative to the operation thereof.

(7)    Whether the shares of the series are convertible into or exchangeable for shares of any other class or of any other series of any class of capital stock of the corporation or any other corporation, and, if so convertible or exchangeable, the price or prices or the rate or rates of conversion or exchange and the method, if any, of adjusting the same, and any other terms and conditions of such conversion or exchange.

3

	(8)    The voting powers, if any, of the shares of the series, and whether and under what conditions the shares of the series (alone or together with the shares of one or more of other series having similar provisions) are entitled to vote separately as a single class, for the election of one or more additional directors of the corporation or upon other matters.
	(9)    Whether the issuance of any additional shares of the series, or of any shares of any other series, is subject to restrictions as to issuance, or as to the powers, preferences or rights of any other series.
	(10)    Any other preferences, privileges and powers and relative participating, optional or other special rights, and qualifications, limitations or restrictions of the series, as the board of directors determines and as are not inconsistent with the provisions of these Restated Articles of Incorporation.
b.    Provisions Applicable to All Preferred Stock.
	(1)    Subject to the designations, relative rights, preferences, and limitations applicable to separate series, each share shall be equal to every other share of the same class.
	(2)    Shares of preferred stock redeemed, converted, exchanged, purchased, retired or surrendered to the corporation, or which have been issued and reacquired in any manner, may, upon compliance with any applicable provisions of the Michigan Business Corporation Act, as amended, be given the status of authorized and unissued shares of preferred stock and may be reissued by the board of directors as part of the series of which they were originally a part or may be reclassified into and reissued as part of a new series or as a part of any other series, all subject to the protective conditions or restrictions of any outstanding series of preferred stock.
	(3)    Any of the voting, distribution, liquidation, or other rights, preferences, or limitations of a series may be made dependent upon facts or circumstances ascertainable outside of the Restated Articles of Incorporation or the resolution or resolutions providing for the issuance of shares of preferred stock adopted by the board of directors, if the manner in which the facts or events operate on the rights, preferences, or limitations is set forth in the Restated Articles of Incorporation or board resolution or resolutions.

Article IV

[Reserved.]

4

Article V

All of the powers of this Corporation, insofar as the same may be lawfully vested by these Articles of Incorporation, are hereby vested in and conferred upon the Board of Directors of this Corporation. In furtherance and not in limitation thereof, the Board of Directors is expressly authorized:

(a)	To set apart out of any of the funds of the Corporation available for dividends a reserve or reserves for any proper purpose and to abolish any such reserve in the manner in which it was created.
(b)	To designate one or more committees, each committee to consist of one or more of the directors of the Corporation. The Board may designate one or more directors as alternate members of any committee, who may replace any absent or disqualified member at any meeting of the committee.

Article VI

Elections of directors need not be by written ballot unless the Bylaws of the Corporation shall so provide.

Article VII

Any action required or permitted under the Michigan Business Corporation Act to be taken at an annual or special meeting of shareholders may be taken without a meeting, without prior notice and without a vote, if consent in writing setting forth the action so taken is signed by the holders of outstanding stock having not less than the minimum number of votes necessary to authorize or take the action at a meeting at which all shares entitled to vote were present and voted.

5

Article VIII

(a)

A director of this Corporation shall not be liable to the Corporation or its shareholders for monetary damages for a breach of a director's fiduciary duty, except for liability; (i) for a breach of the director's duty of loyalty to the Corporation or its shareholders; (ii) for acts or omissions not in god faith or that involve intentional misconduct or a knowing violation of law; (iii) a violation of Section 551(1) of the Michigan Business Corporation Act; or (iv) for a transaction from which the director derived an improper personal benefit. No Amendment to or repeal of this Article VIII (a) shall apply to, or have any effect on, the liability or alleged liability of any director of the Corporation for or with respect to any acts or omissions of such director occurring prior to such amendment or repeal.

(b)

The Corporation shall provide indemnification to persons who serve or have served as directors, officers, employees or agents of the Corporation, and to persons who serve or have served at the request of the Corporation as directors, officers, employees, partners or agents of another foreign or domestic corporation, partnership, joint venture, trust, or other enterprise, whether for profit or not, to the fullest extent permitted by the Michigan Business Corporation Act, as the same now exists or may hereafter be amended.

6

EX-31.1

Exhibit 31.1

Certifications

I, David B. Ramaker, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q for the quarter ended March 31, 2015 of Chemical Financial Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	April 30, 2015
		/s/ David B. Ramaker
		David B. Ramaker Chairman of the Board, Chief Executive Officer and President Chemical Financial Corporation

EX-31.2

Exhibit 31.2

Certifications

I, Lori A. Gwizdala, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q for the quarter ended March 31, 2015 of Chemical Financial Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	April 30, 2015
		/s/ Lori A. Gwizdala
		Lori A. Gwizdala Executive Vice President, Chief Financial Officer and Treasurer Chemical Financial Corporation

EX-32.1

Exhibit 32.1

Certification

Pursuant to 18 U.S.C. § 1350, each of the undersigned hereby certifies in his or her capacity as an officer of Chemical Financial Corporation (the “Company”) that the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2015 fully complies with the requirements of Section 13(a) of the Securities Exchange Act of 1934 and that the information contained in such report fairly presents, in all material respects, the financial condition of the Company at the end of such period and the results of operations of the Company for such period.

Dated:	April 30, 2015	/s/ David B. Ramaker
		David B. Ramaker Chairman of the Board, Chief Executive Officer and President
Dated:	April 30, 2015	/s/ Lori A. Gwizdala
		Lori A. Gwizdala Executive Vice President, Chief Financial Officer and Treasurer

A signed original of this written statement required by Section 906 has been provided to Chemical Financial Corporation and will be retained by Chemical Financial Corporation and furnished to the Securities and Exchange Commission or its staff upon request.

XML

Investment Securities (Summary of Investment Securities with Gross Unrealized Losses) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Summary of continuous unrealized loss position of securities
Less Than 12 Months, Fair Value	$ 293,885	$ 317,885	$ 449,480
Less Than 12 Months, Gross Unrealized Losses	2,114	3,998	9,409
12 Months or More, Fair Value	135,889	302,630	105,584
12 Months or More, Gross Unrealized Losses	6,954	7,295	6,773
Total, Fair Value	429,774	620,515	555,064
Total, Gross Unrealized Losses	9,068	11,293	16,182
Government sponsored agencies [Member]
Summary of continuous unrealized loss position of securities
Less Than 12 Months, Fair Value	27,889	166,963	45,396
Less Than 12 Months, Gross Unrealized Losses	64	406	110
12 Months or More, Fair Value	18,896	31,927	15,204
12 Months or More, Gross Unrealized Losses	37	105	188
Total, Fair Value	46,785	198,890	60,600
Total, Gross Unrealized Losses	101	511	298
State and political subdivisions [Member]
Summary of continuous unrealized loss position of securities
Less Than 12 Months, Fair Value	156,010	62,310	79,787
Less Than 12 Months, Gross Unrealized Losses	1,989	3,348	4,942
12 Months or More, Fair Value	49,839	36,847	56,180
12 Months or More, Gross Unrealized Losses	2,940	1,226	2,041
Total, Fair Value	205,849	99,157	135,967
Total, Gross Unrealized Losses	4,929	4,574	6,983
Residential mortgage-backed securities [Member]
Summary of continuous unrealized loss position of securities
Less Than 12 Months, Fair Value	82,303	17,276	247,397
Less Than 12 Months, Gross Unrealized Losses	28	52	3,472
12 Months or More, Fair Value	3,847	180,194	0
12 Months or More, Gross Unrealized Losses	28	1,491	0
Total, Fair Value	86,150	197,470	247,397
Total, Gross Unrealized Losses	56	1,543	3,472
Collateralized Mortgage Obligations [Member]
Summary of continuous unrealized loss position of securities
Less Than 12 Months, Fair Value	22,694	63,077	76,900
Less Than 12 Months, Gross Unrealized Losses	22	179	885
12 Months or More, Fair Value	41,061	31,620	12,833
12 Months or More, Gross Unrealized Losses	696	1,015	411
Total, Fair Value	63,755	94,697	89,733
Total, Gross Unrealized Losses	718	1,194	1,296
Corporate bonds [Member]
Summary of continuous unrealized loss position of securities
Less Than 12 Months, Fair Value	4,989	0	0
Less Than 12 Months, Gross Unrealized Losses	11	0	0
12 Months or More, Fair Value	14,946	14,952	14,907
12 Months or More, Gross Unrealized Losses	53	48	93
Total, Fair Value	19,935	14,952	14,907
Total, Gross Unrealized Losses	64	48	93
Trust Preferred Securities [Member]
Summary of continuous unrealized loss position of securities
Less Than 12 Months, Fair Value	0	0	0
Less Than 12 Months, Gross Unrealized Losses	0	0	0
12 Months or More, Fair Value	7,300	7,090	6,460
12 Months or More, Gross Unrealized Losses	3,200	3,410	4,040
Total, Fair Value	7,300	7,090	6,460
Total, Gross Unrealized Losses	3,200	3,410	4,040
US Treasury Securities [Member]
Summary of continuous unrealized loss position of securities
Less Than 12 Months, Fair Value	0	8,259
Less Than 12 Months, Gross Unrealized Losses	0	13
12 Months or More, Fair Value	0	0
12 Months or More, Gross Unrealized Losses	0	0
Total, Fair Value	0	8,259
Total, Gross Unrealized Losses	$ 0	$ 13

XML

Intangible Assets (Amortization Expense of Core Deposit Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Carrying amount, accumulated amortization and amortization expense of core deposit intangible assets
Carrying amount	$ 31,655	$ 12,872	$ 33,080
Amortization of intangible assets	1,825	695
Core deposit intangible assets [Member]
Carrying amount, accumulated amortization and amortization expense of core deposit intangible assets
Gross original amount	30,122	18,659	31,550
Accumulated amortization	10,050	9,103	10,687
Carrying amount	20,072	9,556	20,863
Amortization of intangible assets	$ 791	$ 445

XML

Loans (Summary of TDRs) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Schedule of corporation's TDRs
Total TDRs	$ 101,824	$ 101,322	$ 103,671
Commercial Loan Portfolio [Member]
Schedule of corporation's TDRs
Total TDRs	77,511	77,047	79,852
Consumer Loan Portfolio [Member]
Schedule of corporation's TDRs
Total TDRs	24,313	24,275	23,819
Performing [Member]
Schedule of corporation's TDRs
Total TDRs	45,981	45,664	41,823
Performing [Member] | Commercial Loan Portfolio [Member]
Schedule of corporation's TDRs
Total TDRs	28,784	29,179	28,123
Performing [Member] | Consumer Loan Portfolio [Member]
Schedule of corporation's TDRs
Total TDRs	17,197	16,485	13,700
Nonperforming [Member]
Schedule of corporation's TDRs
Total TDRs	18,500	18,467	17,462
Nonperforming [Member] | Commercial Loan Portfolio [Member]
Schedule of corporation's TDRs
Total TDRs	15,810	15,271	11,218
Nonperforming [Member] | Consumer Loan Portfolio [Member]
Schedule of corporation's TDRs
Total TDRs	2,690	3,196	6,244
Substandard Nonaccrual [Member]
Schedule of corporation's TDRs
Total TDRs	37,343	37,191	44,386
Substandard Nonaccrual [Member] | Commercial Loan Portfolio [Member]
Schedule of corporation's TDRs
Total TDRs	32,917	32,597	40,511
Substandard Nonaccrual [Member] | Consumer Loan Portfolio [Member]
Schedule of corporation's TDRs
Total TDRs	$ 4,426	$ 4,594	$ 3,875

XML

Pension and Other Postretirement Benefit Plans (Components of Net Periodic Benefit Cost (Income)) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Defined Benefit Pension Plans [Member]
Components of net periodic benefit cost (income) for the Corporation's qualified and nonqualified pension plans and nonqualified postretirement benefits plan
Service cost	$ 273	$ 250
Interest cost	1,332	1,312
Expected return on plan assets	(2,161)	(2,078)
Amortization of prior service cost	(1)	0
Amortization of unrecognized net loss (gain)	1,056	569
Net periodic benefit cost	499	53
Postretirement Benefit Plan [Member]
Components of net periodic benefit cost (income) for the Corporation's qualified and nonqualified pension plans and nonqualified postretirement benefits plan
Service cost	4	5
Interest cost	33	35
Amortization of prior service cost	32	32
Amortization of unrecognized net loss (gain)	0	(26)
Net periodic benefit cost	$ 69	$ 46

XML

Intangible Assets (Carrying and Fair Value of MSRs) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Net carrying value, fair value of MSRs and loans Corporation servicing for others
Loans serviced for others that have servicing rights capitalized	$ 2,062,544	$ 2,093,140	$ 877,530
Mortgage servicing rights [Member]
Net carrying value, fair value of MSRs and loans Corporation servicing for others
Net carrying value of MSRs	11,583	12,217	3,316
Fair value of MSRs	$ 14,378	$ 14,979	$ 6,706

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Loans (Summary of Information Related to Impaired Loans) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Schedule representing information related to impaired loans
Average recorded investment related to impaired loans	$ 131,534	$ 129,459
Interest income recognized related to loans with impaired status	1,180	1,034
Commercial [Member]
Schedule representing information related to impaired loans
Average recorded investment related to impaired loans	38,576	41,607
Interest income recognized related to loans with impaired status	289	333
Real estate commercial [Member]
Schedule representing information related to impaired loans
Average recorded investment related to impaired loans	60,240	53,320
Interest income recognized related to loans with impaired status	525	361
Real estate construction [Member]
Schedule representing information related to impaired loans
Average recorded investment related to impaired loans	640	167
Interest income recognized related to loans with impaired status	0	0
Land development [Member]
Schedule representing information related to impaired loans
Average recorded investment related to impaired loans	1,875	4,643
Interest income recognized related to loans with impaired status	27	37
Real estate residential [Member]
Schedule representing information related to impaired loans
Average recorded investment related to impaired loans	27,352	26,781
Interest income recognized related to loans with impaired status	331	303
Consumer installment [Member]
Schedule representing information related to impaired loans
Average recorded investment related to impaired loans	499	773
Interest income recognized related to loans with impaired status	0	0
Home equity [Member]
Schedule representing information related to impaired loans
Average recorded investment related to impaired loans	2,352	2,168
Interest income recognized related to loans with impaired status	$ 8	$ 0

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Significant Accounting Policies (Details) (USD $)	3 Months Ended
	Mar. 31, 2015 Bank	Mar. 31, 2014	Dec. 31, 2014	Jun. 24, 2014	Sep. 18, 2013	Apr. 20, 2009	Jan. 31, 2008	Apr. 20, 2015
Business Acquisition [Line Items]
Number of banks through which company operates	1
Number of regional banking units Chemical Bank operates through	4
Number of minimum days when principal or interest is past due is placed in nonaccrual category	90 days
Number of minimum days in real estate residential loan when principal or interest is past due is placed in nonaccrual category	120 days
Time period in which payments receive consistently and loans are returned to accrual status	6 months
Time period sustained for payment history of principal and interest payments to move them to performing status	6 months
Time period of real estate residential troubled debt restructurings reducing borrower's monthly payments by decreasing the interest rate charged on the loan	24 months
Minimum number of days past due as to interest or principal payments in accruing loans moves to nonperforming loans	90 days
Minimum amount of loan reviewed for detailed credit quality	$ 250,000
Time period for historical loan loss experience	5 years
Minimum percentage of tax benefit is recognized for the amount likely to be realized	50.00%
Reserve for contingent income tax liabilities recorded	0	0	0
Expense related to qualified affordable housing projects	100,000	100,000
Remaining investment in qualified affordable housing projects	4,800,000	3,200,000	4,900,000
Number of shares authorized to be repurchased							500,000
Stock repurchased (shares)	0
Number of remaining shares authorized to be repurchased (shares)	500,000
Common Stock, Shares, Issued	32,847,063	29,865,841	32,774,420	2,500,000	2,213,750
CommonStockIssuedOverAllotment				375,000	288,750
Gross Value of Common Stock sold in public stock offering				80,500,000
Shares Issued, Price Per Share				$ 28.00	$ 26.00
Issuance of common stock, net of issuance costs				$ 76,200,000	$ 53,900,000
Preferred stock, shares authorized	200,000	200,000	200,000			200,000
Preferred stock, shares issued	0	0	0
Preferred stock, shares outstanding	0
Common Stock, Shares Authorized	45,000,000	45,000,000	45,000,000
Northwestern Bancorp [Member]
Business Acquisition [Line Items]
Number of pools of aggregate acquired loans based upon common risk characteristics	4
OAK [Member]
Business Acquisition [Line Items]
Number of pools of aggregate acquired loans based upon common risk characteristics	14
Shareholder Approved Proposal [Member]
Business Acquisition [Line Items]
Preferred stock, shares authorized								2,000,000
Common Stock, Shares Authorized								60,000,000

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Intangible Assets (Textual) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Core deposit intangible assets [Member]
Estimated Future Amortization Expense, Fiscal Year Maturity [Abstract]
2015	$ 2,400,000
2016	2,900,000
2017	2,600,000
2018	2,500,000
2019	2,400,000
2020 and thereafter	7,200,000
Mortgage servicing rights [Member]
Intangible Assets (Textual) [Abstract]
Impairment valuation allowance	$ 200,000	$ 200,000	$ 0

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Pension and Other Postretirement Benefit Plans (Textual) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Contribution to corporation's pension plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Contribution to defined benefit pension plan		$ 0
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	4.15%
Chemical Financial Corporation [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of eligible pay contribution to certain employees	4.00%
Defined Contribution Plan, Employer Total Contribution Amount	$ 1.1	$ 0.8

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Loans (Tables)

3 Months Ended

Mar. 31, 2015

Receivables [Abstract]

Summary of loans under portfolio

A summary of loans follows:

	March 31, 2015		December 31, 2014		March 31, 2014
	(In thousands)
Commercial loan portfolio:
Commercial	$	1,356,169	$	1,354,881	$	1,208,641
Commercial real estate	1,616,923		1,557,648		1,279,167
Real estate construction	95,923		152,745		85,084
Land development	12,916		18,750		13,761
Subtotal	3,081,931		3,084,024		2,586,653
Consumer loan portfolio:
Residential mortgage	1,117,445		1,110,390		962,009
Consumer installment	844,066		829,570		675,412
Home equity	659,432		664,246		529,215
Subtotal	2,620,943		2,604,206		2,166,636
Total loans	$	5,702,874	$	5,688,230	$	4,753,289

Recorded investment of loans in the commercial loan portfolio by risk rating categories

The following schedule presents the recorded investment of loans in the commercial loan portfolio by risk rating categories at March 31, 2015, December 31, 2014 and March 31, 2014:

	Commercial		Commercial Real Estate		Real Estate Construction		Land Development		Total
	(In thousands)
March 31, 2015
Originated Portfolio:
Risk Grades 1-5	$	1,176,021	$	1,175,373	$	93,864	$	2,633	$	2,447,891
Risk Grade 6	40,999		44,248		—		738		85,985
Risk Grade 7	28,983		27,961		1,396		601		58,941
Risk Grade 8	18,904		24,760		663		290		44,617
Risk Grade 9	—		6		—		—		6
Subtotal	1,264,907		1,272,348		95,923		4,262		2,637,440
Acquired Portfolio:
Risk Grades 1-5	71,422		318,113		—		6,724		396,259
Risk Grade 6	11,299		7,786		—		253		19,338
Risk Grade 7	6,509		12,735		—		140		19,384
Risk Grade 8	2,032		5,941		—		1,537		9,510
Risk Grade 9	—		—		—		—		—
Subtotal	91,262		344,575		—		8,654		444,491
Total	$	1,356,169	$	1,616,923	$	95,923	$	12,916	$	3,081,931
December 31, 2014
Originated Portfolio:
Risk Grades 1-5	$	1,171,817	$	1,114,529	$	134,668	$	2,952	$	2,423,966
Risk Grade 6	37,800		34,996		1,408		738		74,942
Risk Grade 7	29,863		29,935		2,502		613		62,913
Risk Grade 8	16,417		24,958		162		225		41,762
Risk Grade 9	1		8		—		—		9
Subtotal	1,255,898		1,204,426		138,740		4,528		2,603,592
Acquired Portfolio:
Risk Grades 1-5	76,780		321,018		14,005		11,789		423,592
Risk Grade 6	12,687		8,698		—		583		21,968
Risk Grade 7	4,089		12,478		—		197		16,764
Risk Grade 8	5,427		11,028		—		1,653		18,108
Risk Grade 9	—		—		—		—		—
Subtotal	98,983		353,222		14,005		14,222		480,432
Total	$	1,354,881	$	1,557,648	$	152,745	$	18,750	$	3,084,024
March 31, 2014
Originated Portfolio:
Risk Grades 1-5	$	1,060,743	$	1,034,517	$	70,750	$	3,831	$	2,169,841
Risk Grade 6	18,359		33,962		680		968		53,969
Risk Grade 7	33,768		32,671		815		700		67,954
Risk Grade 8	17,301		27,552		160		2,267		47,280
Risk Grade 9	950		16		—		—		966
Subtotal	1,131,121		1,128,718		72,405		7,766		2,340,010
Acquired Portfolio:
Risk Grades 1-5	67,326		139,130		12,679		3,906		223,041
Risk Grade 6	2,423		2,627		—		—		5,050
Risk Grade 7	3,635		7,753		—		—		11,388
Risk Grade 8	4,136		939		—		2,089		7,164
Risk Grade 9	—		—		—		—		—
Subtotal	77,520		150,449		12,679		5,995		246,643
Total	$	1,208,641	$	1,279,167	$	85,084	$	13,761	$	2,586,653

Recorded investment of loans in the consumer loan portfolio based on the credit risk profile of loans in a performing and nonperforming status

The following schedule presents the recorded investment of loans in the consumer loan portfolio based on loans in a performing status and loans in a nonperforming status at March 31, 2015, December 31, 2014 and March 31, 2014:

	Residential Mortgage		Consumer Installment		Home Equity		Total Consumer
	(In thousands)
March 31, 2015
Originated Loans:
Performing	$	998,196	$	834,926	$	565,992	$	2,399,114
Nonperforming	9,376		433		2,299		12,108
Subtotal	1,007,572		835,359		568,291		2,411,222
Acquired Loans:
Performing	109,005		8,696		90,686		208,387
Nonperforming	868		11		455		1,334
Subtotal	109,873		8,707		91,141		209,721
Total	$	1,117,445	$	844,066	$	659,432	$	2,620,943
December 31, 2014
Originated Loans:
Performing	$	987,542	$	818,878	$	566,083	$	2,372,503
Nonperforming	10,459		500		3,013		13,972
Subtotal	998,001		819,378		569,096		2,386,475
Acquired Loans:
Performing	111,101		10,174		94,696		215,971
Nonperforming	1,288		18		454		1,760
Subtotal	112,389		10,192		95,150		217,731
Total	$	1,110,390	$	829,570	$	664,246	$	2,604,206
March 31, 2014
Originated Loans:
Performing	$	937,968	$	672,984	$	497,196	$	2,108,148
Nonperforming	12,833		806		2,668		16,307
Subtotal	950,801		673,790		499,864		2,124,455
Acquired Loans:
Performing	11,150		1,622		29,020		41,792
Nonperforming	58		—		331		389
Subtotal	11,208		1,622		29,351		42,181
Total	$	962,009	$	675,412	$	529,215	$	2,166,636

Summary of nonperforming loans

A summary of nonperforming loans follows:

	March 31, 2015		December 31, 2014		March 31, 2014
	(In thousands)
Nonaccrual loans:
Commercial	$	18,904	$	16,418	$	18,251
Commercial real estate	24,766		24,966		27,568
Real estate construction	663		162		160
Land development	290		225		2,267
Residential mortgage	6,514		6,706		6,589
Consumer installment	433		500		806
Home equity	1,870		1,667		2,046
Total nonaccrual loans	53,440		50,644		57,687
Accruing loans contractually past due 90 days or more as to interest or principal payments:
Commercial	52		170		43
Commercial real estate	148		—		730
Real estate construction	—		—		—
Land development	—		—		—
Residential mortgage	172		557		—
Consumer installment	—		—		—
Home equity	429		1,346		622
Total accruing loans contractually past due 90 days or more as to interest or principal payments	801		2,073		1,395
Nonperforming TDRs:
Commercial loan portfolio	15,810		15,271		11,218
Consumer loan portfolio	2,690		3,196		6,244
Total nonperforming TDRs	18,500		18,467		17,462
Total nonperforming loans	$	72,741	$	71,184	$	76,544

Schedule of Impaired loans by classes

The following schedule presents impaired loans by classes of loans at March 31, 2015, December 31, 2014 and March 31, 2014:

	Recorded Investment		Unpaid Principal Balance		Related Valuation Allowance
	(In thousands)
March 31, 2015
Impaired loans with a valuation allowance:
Commercial	$	3,433	$	3,527	$	1,119
Commercial real estate	1,780		1,961		496
Real estate construction	—		—		—
Land development	—		—		—
Residential mortgage	19,887		19,887		297
Subtotal	25,100		25,375		1,912
Impaired loans with no related valuation allowance:
Commercial	33,733		39,382		—
Commercial real estate	57,628		79,696		—
Real estate construction	663		836		—
Land development	1,877		3,428		—
Residential mortgage	7,382		7,382		—
Consumer installment	444		444		—
Home equity	2,325		2,325		—
Subtotal	104,052		133,493		—
Total impaired loans:
Commercial	37,166		42,909		1,119
Commercial real estate	59,408		81,657		496
Real estate construction	663		836		—
Land development	1,877		3,428		—
Residential mortgage	27,269		27,269		297
Consumer installment	444		444		—
Home equity	2,325		2,325		—
Total	$	129,152	$	158,868	$	1,912
December 31, 2014
Impaired loans with a valuation allowance:
Commercial	$	966	$	1,040	$	293
Commercial real estate	2,587		2,927		710
Real estate construction	—		—		—
Land development	—		—		—
Residential mortgage	19,681		19,681		335
Subtotal	23,234		23,648		1,338
Impaired loans with no related valuation allowance:
Commercial	38,094		44,557		—
Commercial real estate	60,616		82,693		—
Real estate construction	162		255		—
Land development	1,928		3,484		—
Residential mortgage	7,994		7,994		—
Consumer installment	518		518		—
Home equity	2,121		2,121		—
Subtotal	111,433		141,622		—
Total impaired loans:
Commercial	39,060		45,597		293
Commercial real estate	63,203		85,620		710
Real estate construction	162		255		—
Land development	1,928		3,484		—
Residential mortgage	27,675		27,675		335
Consumer installment	518		518		—
Home equity	2,121		2,121		—
Total	$	134,667	$	165,270	$	1,338

	Recorded Investment		Unpaid Principal Balance		Related Valuation Allowance
	(In thousands)
March 31, 2014
Impaired loans with a valuation allowance:
Commercial	$	3,534	$	3,704	$	1,250
Commercial real estate	3,720		3,878		371
Real estate construction	—		—		—
Land development	—		—		—
Residential mortgage	19,944		19,944		444
Subtotal	27,198		27,526		2,065
Impaired loans with no related valuation allowance:
Commercial	38,150		42,914		—
Commercial real estate	49,074		62,207		—
Real estate construction	160		366		—
Land development	4,472		7,773		—
Residential mortgage	6,589		6,589		—
Consumer installment	806		806		—
Home equity	2,046		2,046		—
Subtotal	101,297		122,701		—
Total impaired loans:
Commercial	41,684		46,618		1,250
Commercial real estate	52,794		66,085		371
Real estate construction	160		366		—
Land development	4,472		7,773		—
Residential mortgage	26,533		26,533		444
Consumer installment	806		806		—
Home equity	2,046		2,046		—
Total	$	128,495	$	150,227	$	2,065

Schedule presents information related to impaired loans

The following schedule presents information related to impaired loans for the three months ended March 31, 2015 and 2014:

	Three Months Ended March 31, 2015
	Average Recorded Investment		Interest Income Recognized While on Impaired Status
	(In thousands)
Commercial	$	38,576	$	289
Commercial real estate	60,240		525
Real estate construction	640		—
Land development	1,875		27
Residential mortgage	27,352		331
Consumer installment	499		—
Home equity	2,352		8
Total	$	131,534	$	1,180

	Three Months Ended March 31, 2014
	Average Recorded Investment		Interest Income Recognized While on Impaired Status
	(In thousands)
Commercial	$	41,607	$	333
Commercial real estate	53,320		361
Real estate construction	167		—
Land development	4,643		37
Residential mortgage	26,781		303
Consumer installment	773		—
Home equity	2,168		—
Total	$	129,459	$	1,034

Schedule representing the aging status of the recorded investment in loans by classes

The following schedule presents the aging status of the recorded investment in loans by classes of loans at March 31, 2015, December 31, 2014 and March 31, 2014:

	31-60 Days Past Due		61-89 Days Past Due		Accruing Loans Past Due 90 Days or More		Non-accrual Loans		Total Past Due		Current		Total Loans
	(In thousands)
March 31, 2015
Originated Portfolio:
Commercial	$	10,121	$	729	$	52	$	18,904	$	29,806	$	1,235,101	$	1,264,907
Commercial real estate	7,238		2,267		148		24,766		34,419		1,237,929		1,272,348
Real estate construction	340		—		—		663		1,003		94,920		95,923
Land development	—		—		—		290		290		3,972		4,262
Residential mortgage	1,246		88		172		6,514		8,020		999,552		1,007,572
Consumer installment	2,143		344		—		433		2,920		832,439		835,359
Home equity	1,728		197		429		1,870		4,224		564,067		568,291
Total	$	22,816	$	3,625	$	801	$	53,440	$	80,682	$	4,967,980	$	5,048,662
Acquired Portfolio:
Commercial	$	59	$	5	$	2,089	$	—	$	2,153	$	89,109	$	91,262
Commercial real estate	1,784		138		6,271		—		8,193		336,382		344,575
Real estate construction	—		—		—		—		—		—		—
Land development	—		—		1,537		—		1,537		7,117		8,654
Residential mortgage	104		—		868		—		972		108,901		109,873
Consumer installment	3		1		11		—		15		8,692		8,707
Home equity	349		234		455		—		1,038		90,103		91,141
Total	$	2,299	$	378	$	11,231	$	—	$	13,908	$	640,304	$	654,212

	31-60 Days Past Due		61-89 Days Past Due		Accruing Loans Past Due 90 Days or More		Non-accrual Loans		Total Past Due		Current		Total Loans
	(In thousands)
December 31, 2014
Originated Portfolio:
Commercial	$	4,033	$	743	$	170	$	16,418	$	21,364	$	1,234,534	$	1,255,898
Commercial real estate	7,515		1,383		—		24,966		33,864		1,170,562		1,204,426
Real estate construction	262		—		—		162		424		138,316		138,740
Land development	—		—		—		225		225		4,303		4,528
Residential mortgage	2,126		54		557		6,706		9,443		988,558		998,001
Consumer installment	3,620		512		—		500		4,632		814,746		819,378
Home equity	3,039		660		1,346		1,667		6,712		562,384		569,096
Total	$	20,595	$	3,352	$	2,073	$	50,644	$	76,664	$	4,913,403	$	4,990,067
Acquired Portfolio:
Commercial	$	133	$	—	$	5,427	$	—	$	5,560	$	93,423	$	98,983
Commercial real estate	2,014		352		11,052		—		13,418		339,804		353,222
Real estate construction	—		—		—		—		—		14,005		14,005
Land development	—		—		1,653		—		1,653		12,569		14,222
Residential mortgage	156		—		18		—		174		112,215		112,389
Consumer installment	55		3		454		—		512		9,680		10,192
Home equity	636		106		1,288		—		2,030		93,120		95,150
Total	$	2,994	$	461	$	19,892	$	—	$	23,347	$	674,816	$	698,163
March 31, 2014
Originated Portfolio:
Commercial	$	6,003	$	1,832	$	43	$	18,251	$	26,129	$	1,104,992	$	1,131,121
Commercial real estate	4,094		1,098		730		27,568		33,490		1,095,228		1,128,718
Real estate construction	18		—		—		160		178		72,227		72,405
Land development	—		—		—		2,267		2,267		5,499		7,766
Residential mortgage	1,259		1,138		—		6,589		8,986		941,815		950,801
Consumer installment	1,950		313		—		806		3,069		670,721		673,790
Home equity	1,500		256		622		2,046		4,424		495,440		499,864
Total	$	14,824	$	4,637	$	1,395	$	57,687	$	78,543	$	4,385,922	$	4,464,465
Acquired Portfolio:
Commercial	$	—	$	—	$	6,496	$	—	$	6,496	$	71,024	$	77,520
Commercial real estate	—		—		2,549		—		2,549		147,900		150,449
Real estate construction	—		—		—		—		—		12,679		12,679
Land development	—		—		2,089		—		2,089		3,906		5,995
Residential mortgage	—		—		58		—		58		11,150		11,208
Consumer installment	49		—		—		—		49		1,573		1,622
Home equity	49		—		331		—		380		28,971		29,351
Total	$	98	$	—	$	11,523	$	—	$	11,621	$	277,203	$	288,824

Schedule of Corporation's TDRs

The following schedule presents the Corporation’s loans reported as TDRs at March 31, 2015, December 31, 2014 and March 31, 2014:

	Performing TDRs		Non-Performing TDRs		Nonaccrual TDRs		Total
	(In thousands)
March 31, 2015
Commercial loan portfolio	$	28,784	$	15,810	$	32,917	$	77,511
Consumer loan portfolio	17,197		2,690		4,426		24,313
Total	$	45,981	$	18,500	$	37,343	$	101,824
December 31, 2014
Commercial loan portfolio	$	29,179	$	15,271	$	32,597	$	77,047
Consumer loan portfolio	16,485		3,196		4,594		24,275
Total	$	45,664	$	18,467	$	37,191	$	101,322
March 31, 2014
Commercial loan portfolio	$	28,123	$	11,218	$	40,511	$	79,852
Consumer loan portfolio	13,700		6,244		3,875		23,819
Total	$	41,823	$	17,462	$	44,386	$	103,671

Schedule providing information on TDRs

The following schedule provides information on the Corporation's TDRs that were modified during the three months ended March 31, 2015 and 2014:

	Number of Loans	Pre- Modification Recorded Investment		Post- Modification Recorded Investment
	(Dollars in thousands)
Three Months Ended March 31, 2015
Commercial loan portfolio:
Commercial	5	$	1,932	$	1,932
Commercial real estate	5	2,534		2,534
Land development	—	—		—
Subtotal – commercial loan portfolio	10	4,466		4,466
Consumer loan portfolio	10	336		336
Total	20	$	4,802	$	4,802

Three Months Ended March 31, 2014
Commercial loan portfolio:
Commercial	12	$	8,356	$	8,356
Commercial real estate	9	2,790		2,790
Real estate construction	—	—		—
Land development	1	72		72
Subtotal – commercial loan portfolio	22	11,218		11,218
Consumer loan portfolio	30	987		978
Total	52	$	12,205	$	12,196

Troubled debt restructurings on financing receivables with defaults payment

The following schedule includes TDRs for which there was a payment default during the three months ended March 31, 2015 and 2014, whereby the borrower was past due with respect to principal and/or interest for 90 days or more, and the loan became a TDR during the twelve-month period prior to the default:

	Number of Loans	Principal Balance at End of Period
	(Dollars in thousands)
Three Months Ended March 31, 2015
Commercial loan portfolio:
Commercial	—	$	—
Commercial real estate	3	759
Subtotal – commercial loan portfolio	3	759
Consumer loan portfolio	1	33
Total	4	$	792
Three Months Ended March 31, 2014
Commercial loan portfolio:
Commercial	1	$	104
Commercial real estate	2	1,670
Real estate construction	—	—
Land development	—	—
Subtotal – commercial loan portfolio	3	1,774
Consumer loan portfolio	—	—
Total	3	$	1,774

Schedule of allowance and recorded investment related to financing receivables segregated by portfolio segment

The following schedule presents, by loan portfolio segment, the changes in the allowance for the three months ended March 31, 2015 and details regarding the balance in the allowance and the recorded investment in loans at March 31, 2015 by impairment evaluation method.

	Commercial Loan Portfolio			Consumer Loan Portfolio			Unallocated		Total
	(In thousands)
Changes in allowance for loan losses for the three months ended March 31, 2015:
Beginning balance	$	44,156		$	28,803		$	2,724	$	75,683
Provision for loan losses	3,593			(3,227		)	1,134		1,500
Charge-offs	(1,504		)	(1,639		)	—		(3,143		)
Recoveries	574			642			—		1,216
Ending balance	$	46,819		$	24,579		$	3,858	$	75,256
Allowance for loan losses balance at March 31, 2015 attributable to:
Loans individually evaluated for impairment	$	1,615		$	297		$	—	$	1,912
Loans collectively evaluated for impairment	45,204			24,282			3,858		73,344
Loans acquired with deteriorated credit quality	—			—			—		—
Total	$	46,819		$	24,579		$	3,858	$	75,256
Recorded investment (loan balance) at March 31, 2015:
Loans individually evaluated for impairment	$	89,217		$	19,887		$	—	$	109,104
Loans collectively evaluated for impairment	2,548,223			2,391,335			—		4,939,558
Loans acquired with deteriorated credit quality	444,491			209,721			—		654,212
Total	$	3,081,931		$	2,620,943		$	—	$	5,702,874

The following schedule presents, by loan portfolio segment, details regarding the balance in the allowance and the recorded investment in loans at December 31, 2014 by impairment evaluation method.

	Commercial Loan Portfolio		Consumer Loan Portfolio		Unallocated		Total
	(In thousands)
Allowance for loan losses balance at December 31, 2014 attributable to:
Loans individually evaluated for impairment	$	1,003	$	335	$	—	$	1,338
Loans collectively evaluated for impairment	43,153		27,968		2,724		73,845
Loans acquired with deteriorated credit quality	—		500		—		500
Total	$	44,156	$	28,803	$	2,724	$	75,683
Recorded investment (loan balance) at December 31, 2014:
Loans individually evaluated for impairment	$	86,221	$	19,681	$	—	$	105,902
Loans collectively evaluated for impairment	2,517,371		2,366,794		—		4,884,165
Loans acquired with deteriorated credit quality	480,432		217,731		—		698,163
Total	$	3,084,024	$	2,604,206	$	—	$	5,688,230

The following schedule presents, by loan portfolio segment, the changes in the allowance for the three months ended March 31, 2014 and details regarding the balance in the allowance and the recorded investment in loans at March 31, 2014 by impairment evaluation method.

	Commercial Loan Portfolio			Consumer Loan Portfolio			Unallocated			Total
	(In thousands)
Changes in allowance for loan losses for the three months ended March 31, 2014:
Beginning balance	$	44,482		$	30,145		$	4,445		$	79,072
Provision for loan losses	960			855			(215		)	1,600
Charge-offs	(1,209		)	(2,263		)	—			(3,472		)
Recoveries	777			496			—			1,273
Ending balance	$	45,010		$	29,233		$	4,230		$	78,473
Allowance for loan losses balance at March 31, 2014 attributable to:
Loans individually evaluated for impairment	$	1,621		$	444		$	—		$	2,065
Loans collectively evaluated for impairment	43,389			28,289			4,230			75,908
Loans acquired with deteriorated credit quality	—			500			—			500
Total	$	45,010		$	29,233		$	4,230		$	78,473
Recorded investment (loan balance) at March 31, 2014:
Loans individually evaluated for impairment	$	87,587		$	19,944		$	—		$	107,531
Loans collectively evaluated for impairment	2,252,423			2,104,511			—			4,356,934
Loans acquired with deteriorated credit quality	246,643			42,181			—			288,824
Total	$	2,586,653		$	2,166,636		$	—		$	4,753,289

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Loans (Summary of TDRs with a Payment Default During the Period) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 Loans	Mar. 31, 2014 Loans
Troubled debt restructurings on financing receivables with defaults payment
Financing receivable modifications subsequent default number of contract	4	3
Financing receivable modification subsequent default recorded investment	$ 792	$ 1,774
Consumer Portfolio Segment [Member]
Troubled debt restructurings on financing receivables with defaults payment
Financing receivable modifications subsequent default number of contract	1	0
Financing receivable modification subsequent default recorded investment	33	0
Commercial [Member] | Commercial Loan Portfolio [Member]
Troubled debt restructurings on financing receivables with defaults payment
Financing receivable modifications subsequent default number of contract	0	1
Financing receivable modification subsequent default recorded investment	0	104
Real estate commercial [Member] | Commercial Loan Portfolio [Member]
Troubled debt restructurings on financing receivables with defaults payment
Financing receivable modifications subsequent default number of contract	3	2
Financing receivable modification subsequent default recorded investment	759	1,670
Real Estate Construction Loans [Member] | Commercial Loan Portfolio [Member]
Troubled debt restructurings on financing receivables with defaults payment
Financing receivable modifications subsequent default number of contract		0
Financing receivable modification subsequent default recorded investment		0
Land Development Loans [Member] | Commercial Loan Portfolio [Member]
Troubled debt restructurings on financing receivables with defaults payment
Financing receivable modifications subsequent default number of contract		0
Financing receivable modification subsequent default recorded investment		0
Subtotal-commercial loan portfolio [Member] | Commercial Loan Portfolio [Member]
Troubled debt restructurings on financing receivables with defaults payment
Financing receivable modifications subsequent default number of contract	3	3
Financing receivable modification subsequent default recorded investment	$ 759	$ 1,774

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Loans (Summary of Recorded Investment of Commercial Loans by Risk Rating Categories) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	$ 3,081,931	$ 3,084,024	$ 2,586,653
Commercial [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	1,356,169	1,354,881	1,208,641
Real estate commercial [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	1,616,923	1,557,648	1,279,167
Real estate construction [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	95,923	152,745	85,084
Land development [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	12,916	18,750	13,761
Originated Portfolio [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	2,637,440	2,603,592	2,340,010
Originated Portfolio [Member] | Risk Grades 1-5 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	2,447,891	2,423,966	2,169,841
Originated Portfolio [Member] | Risk Grade 6 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	85,985	74,942	53,969
Originated Portfolio [Member] | Risk Grade 7 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	58,941	62,913	67,954
Originated Portfolio [Member] | Risk Grade 8 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	44,617	41,762	47,280
Originated Portfolio [Member] | Risk Grade 9 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	6	9	966
Originated Portfolio [Member] | Commercial [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	1,264,907	1,255,898	1,131,121
Originated Portfolio [Member] | Commercial [Member] | Risk Grades 1-5 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	1,176,021	1,171,817	1,060,743
Originated Portfolio [Member] | Commercial [Member] | Risk Grade 6 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	40,999	37,800	18,359
Originated Portfolio [Member] | Commercial [Member] | Risk Grade 7 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	28,983	29,863	33,768
Originated Portfolio [Member] | Commercial [Member] | Risk Grade 8 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	18,904	16,417	17,301
Originated Portfolio [Member] | Commercial [Member] | Risk Grade 9 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	0	1	950
Originated Portfolio [Member] | Real estate commercial [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	1,272,348	1,204,426	1,128,718
Originated Portfolio [Member] | Real estate commercial [Member] | Risk Grades 1-5 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	1,175,373	1,114,529	1,034,517
Originated Portfolio [Member] | Real estate commercial [Member] | Risk Grade 6 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	44,248	34,996	33,962
Originated Portfolio [Member] | Real estate commercial [Member] | Risk Grade 7 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	27,961	29,935	32,671
Originated Portfolio [Member] | Real estate commercial [Member] | Risk Grade 8 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	24,760	24,958	27,552
Originated Portfolio [Member] | Real estate commercial [Member] | Risk Grade 9 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	6	8	16
Originated Portfolio [Member] | Real estate construction [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	95,923	138,740	72,405
Originated Portfolio [Member] | Real estate construction [Member] | Risk Grades 1-5 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	93,864	134,668	70,750
Originated Portfolio [Member] | Real estate construction [Member] | Risk Grade 6 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	0	1,408	680
Originated Portfolio [Member] | Real estate construction [Member] | Risk Grade 7 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	1,396	2,502	815
Originated Portfolio [Member] | Real estate construction [Member] | Risk Grade 8 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	663	162	160
Originated Portfolio [Member] | Real estate construction [Member] | Risk Grade 9 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	0	0	0
Originated Portfolio [Member] | Land development [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	4,262	4,528	7,766
Originated Portfolio [Member] | Land development [Member] | Risk Grades 1-5 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	2,633	2,952	3,831
Originated Portfolio [Member] | Land development [Member] | Risk Grade 6 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	738	738	968
Originated Portfolio [Member] | Land development [Member] | Risk Grade 7 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	601	613	700
Originated Portfolio [Member] | Land development [Member] | Risk Grade 8 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	290	225	2,267
Originated Portfolio [Member] | Land development [Member] | Risk Grade 9 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	0	0	0
Acquired Portfolio [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	444,491	480,432	246,643
Acquired Portfolio [Member] | Risk Grades 1-5 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	396,259	423,592	223,041
Acquired Portfolio [Member] | Risk Grade 6 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	19,338	21,968	5,050
Acquired Portfolio [Member] | Risk Grade 7 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	19,384	16,764	11,388
Acquired Portfolio [Member] | Risk Grade 8 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	9,510	18,108	7,164
Acquired Portfolio [Member] | Risk Grade 9 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	0	0	0
Acquired Portfolio [Member] | Commercial [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	91,262	98,983	77,520
Acquired Portfolio [Member] | Commercial [Member] | Risk Grades 1-5 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	71,422	76,780	67,326
Acquired Portfolio [Member] | Commercial [Member] | Risk Grade 6 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	11,299	12,687	2,423
Acquired Portfolio [Member] | Commercial [Member] | Risk Grade 7 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	6,509	4,089	3,635
Acquired Portfolio [Member] | Commercial [Member] | Risk Grade 8 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	2,032	5,427	4,136
Acquired Portfolio [Member] | Commercial [Member] | Risk Grade 9 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	0	0	0
Acquired Portfolio [Member] | Real estate commercial [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	344,575	353,222	150,449
Acquired Portfolio [Member] | Real estate commercial [Member] | Risk Grades 1-5 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	318,113	321,018	139,130
Acquired Portfolio [Member] | Real estate commercial [Member] | Risk Grade 6 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	7,786	8,698	2,627
Acquired Portfolio [Member] | Real estate commercial [Member] | Risk Grade 7 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	12,735	12,478	7,753
Acquired Portfolio [Member] | Real estate commercial [Member] | Risk Grade 8 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	5,941	11,028	939
Acquired Portfolio [Member] | Real estate commercial [Member] | Risk Grade 9 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	0	0	0
Acquired Portfolio [Member] | Real estate construction [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	0	14,005	12,679
Acquired Portfolio [Member] | Real estate construction [Member] | Risk Grades 1-5 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	0	14,005	12,679
Acquired Portfolio [Member] | Real estate construction [Member] | Risk Grade 6 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	0	0	0
Acquired Portfolio [Member] | Real estate construction [Member] | Risk Grade 7 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	0	0	0
Acquired Portfolio [Member] | Real estate construction [Member] | Risk Grade 8 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	0	0	0
Acquired Portfolio [Member] | Real estate construction [Member] | Risk Grade 9 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	0	0	0
Acquired Portfolio [Member] | Land development [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	8,654	14,222	5,995
Acquired Portfolio [Member] | Land development [Member] | Risk Grades 1-5 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	6,724	11,789	3,906
Acquired Portfolio [Member] | Land development [Member] | Risk Grade 6 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	253	583	0
Acquired Portfolio [Member] | Land development [Member] | Risk Grade 7 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	140	197	0
Acquired Portfolio [Member] | Land development [Member] | Risk Grade 8 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	1,537	1,653	2,089
Acquired Portfolio [Member] | Land development [Member] | Risk Grade 9 [Member]
Recorded investment of loans in commercial loan portfolio by risk rating categories
Recorded investment (loan balance), Commercial, Total	$ 0	$ 0	$ 0

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Investment Securities (Summary of Amortized Cost and Fair Value of Held-To-Maturity Investment Securities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Held-to-maturity Securities
Investment securities held-to-maturity, Amortized Cost	$ 381,450	$ 316,413	$ 278,099
Investment securities held-to-maturity, Unrealized Gains	6,852	7,294	5,331
Investment securities held-to-maturity, Unrealized Losses	8,126	7,967	11,023
Total Held-to-maturity securities, Debt maturities, Fair Value	380,176	315,740	272,407
State and political subdivisions [Member]
Held-to-maturity Securities
Investment securities held-to-maturity, Amortized Cost	370,950	305,913	267,599
Investment securities held-to-maturity, Unrealized Gains	6,852	7,294	5,331
Investment securities held-to-maturity, Unrealized Losses	4,926	4,557	6,983
Total Held-to-maturity securities, Debt maturities, Fair Value	372,876	308,650	265,947
Trust Preferred Securities [Member]
Held-to-maturity Securities
Investment securities held-to-maturity, Amortized Cost	10,500	10,500	10,500
Investment securities held-to-maturity, Unrealized Gains	0	0	0
Investment securities held-to-maturity, Unrealized Losses	3,200	3,410	4,040
Total Held-to-maturity securities, Debt maturities, Fair Value	$ 7,300	$ 7,090	$ 6,460

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Loans (Textual) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015 Loans Tenants BaordOfDirectors Segment	Dec. 31, 2014	Mar. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Losses, Acquired with Deteriorated Credit Quality	$ 0	$ 500,000	$ 500,000
Loans (Textual) [Abstract]
Number of portfolio segment	2
Number of classes of loans	7
Number of minimum tenants under lease of non-owner occupied commercial real estate	1
Number of members of the board of directors in loan committee	8
Minimum due period of loans consider in a nonperforming status	90 days
Total nonaccrual TDR loans	37,300,000	37,200,000	44,400,000
Difference between recorded investment and unpaid principal balance of loan	29,700,000	30,600,000	21,700,000
Confirmed losses (partial charge-offs)	14,800,000	15,400,000	17,800,000
Fair value of discount adjustment	14,900,000	15,200,000	3,900,000
Acquired impaired loans	11,200,000	19,900,000	11,500,000
Performing trouble debt restructuring under impaired loans	46,000,000	45,700,000	41,800,000
Financing receivable allowance for acquired loans		500,000	500,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference	0
Residential Mortgage Loans in Process of Foreclosure	2,200,000
Commercial Loan Portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Losses, Acquired with Deteriorated Credit Quality	0	0	0
Loans (Textual) [Abstract]
Minimum value of loan requires executive and senior officer approval	1,500,000
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Losses, Acquired with Deteriorated Credit Quality	0	500,000	500,000
Loans (Textual) [Abstract]
Maximum due period of loans consider in performing status	90 days
Minimum due period of loans consider in a nonperforming status	90 days
Commercial [Member]
Loans (Textual) [Abstract]
Minimum value of loan requires group loan authority approval	1,000,000
Maximum value of loan requires executive and senior officer approval	3,500,000
Increase in Minimum Value of Loans Requiring Group Loan Authority Approval	5,000,000
Real Estate Residential Loans [Member]
Loans (Textual) [Abstract]
Period for loan secured under real estate residential security	15 years
Loan-to-value ratio at the time of origination	80.00%
Land Development Loans [Member]
Loans (Textual) [Abstract]
Maximum period for payment of loan	12 months
Maximum [Member] | Commercial Loan Portfolio [Member]
Loans (Textual) [Abstract]
Maximum value of loan requires group loan authority approval	10,000,000
Other loans requiring director loan committee approval depending on risk rating and credit action required	10,000,000
Maximum [Member] | Real Estate Residential Loans [Member]
Loans (Textual) [Abstract]
Upper limit of number of family residential properties	4
Minimum [Member] | Commercial Loan Portfolio [Member]
Loans (Textual) [Abstract]
Minimum value of loan requires group loan authority approval	1,000,000
Minimum value of loans depending on risk rating and requires credit action from board of directors	15,000,000
Minimum [Member] | Commercial [Member]
Loans (Textual) [Abstract]
Minimum value of loans requiring only director loan committee approval	$ 10,000,000
Minimum [Member] | Real Estate Residential Loans [Member]
Loans (Textual) [Abstract]
Lower limit of number of family residential properties	1

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Share-Based Compensation (Black-Scholes Pricing Model Assumptions) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015
Assumptions of Black-Scholes option pricing model
Expected dividend yield	3.50%
Risk-free interest rate	1.78%
Expected stock price volatility	39.10%
Expected life of options - in years	7 years 0 months 0 days
Weighted average fair value of options granted	$ 8.40

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Fair Value Measurements (Fair Value of Assets on a Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Summary of assets measured at fair value on a recurring basis
Available-for-sale, at fair value	$ 680,644	$ 748,864	$ 657,818
Fair Value Measurements Recurring [Member]
Summary of assets measured at fair value on a recurring basis
Available-for-sale, at fair value	680,644	748,864	657,818
Loans Held-for-sale	9,675	9,128	3,814
Total assets measured at fair value on a recurring basis	690,319	757,992	661,632
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Fair Value Measurements Recurring [Member]
Summary of assets measured at fair value on a recurring basis
Available-for-sale, at fair value	8,302	8,259	0
Loans Held-for-sale	0	0	0
Total assets measured at fair value on a recurring basis	8,302	8,259	0
Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measurements Recurring [Member]
Summary of assets measured at fair value on a recurring basis
Available-for-sale, at fair value	672,342	740,605	657,818
Loans Held-for-sale	9,675	9,128	3,814
Total assets measured at fair value on a recurring basis	682,017	749,733	661,632
Significant Unobservable Inputs (Level 3) [Member] | Fair Value Measurements Recurring [Member]
Summary of assets measured at fair value on a recurring basis
Available-for-sale, at fair value	0	0	0
Loans Held-for-sale	0	0	0
Total assets measured at fair value on a recurring basis	0	0	0
US Treasury Securities [Member]
Summary of assets measured at fair value on a recurring basis
Available-for-sale, at fair value	8,302	8,259
US Treasury Securities [Member] | Fair Value Measurements Recurring [Member]
Summary of assets measured at fair value on a recurring basis
Available-for-sale, at fair value	8,302	8,259
US Treasury Securities [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Fair Value Measurements Recurring [Member]
Summary of assets measured at fair value on a recurring basis
Available-for-sale, at fair value	8,302	8,259
US Treasury Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measurements Recurring [Member]
Summary of assets measured at fair value on a recurring basis
Available-for-sale, at fair value	0	0
US Treasury Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value Measurements Recurring [Member]
Summary of assets measured at fair value on a recurring basis
Available-for-sale, at fair value	0	0
Government sponsored agencies [Member]
Summary of assets measured at fair value on a recurring basis
Available-for-sale, at fair value	250,430	263,503	91,610
Government sponsored agencies [Member] | Fair Value Measurements Recurring [Member]
Summary of assets measured at fair value on a recurring basis
Available-for-sale, at fair value	250,430	263,503	91,610
Government sponsored agencies [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Fair Value Measurements Recurring [Member]
Summary of assets measured at fair value on a recurring basis
Available-for-sale, at fair value	0	0	0
Government sponsored agencies [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measurements Recurring [Member]
Summary of assets measured at fair value on a recurring basis
Available-for-sale, at fair value	250,430	263,503	91,610
Government sponsored agencies [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value Measurements Recurring [Member]
Summary of assets measured at fair value on a recurring basis
Available-for-sale, at fair value	0	0	0
State and political subdivisions [Member]
Summary of assets measured at fair value on a recurring basis
Available-for-sale, at fair value	32,322	46,227	43,777
State and political subdivisions [Member] | Fair Value Measurements Recurring [Member]
Summary of assets measured at fair value on a recurring basis
Available-for-sale, at fair value	32,322	46,227	43,777
State and political subdivisions [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Fair Value Measurements Recurring [Member]
Summary of assets measured at fair value on a recurring basis
Available-for-sale, at fair value	0	0	0
State and political subdivisions [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measurements Recurring [Member]
Summary of assets measured at fair value on a recurring basis
Available-for-sale, at fair value	32,322	46,227	43,777
State and political subdivisions [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value Measurements Recurring [Member]
Summary of assets measured at fair value on a recurring basis
Available-for-sale, at fair value	0	0	0
Residential mortgage-backed securities [Member]
Summary of assets measured at fair value on a recurring basis
Available-for-sale, at fair value	219,601	239,807	288,738
Residential mortgage-backed securities [Member] | Fair Value Measurements Recurring [Member]
Summary of assets measured at fair value on a recurring basis
Available-for-sale, at fair value	219,601	239,807	288,738
Residential mortgage-backed securities [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Fair Value Measurements Recurring [Member]
Summary of assets measured at fair value on a recurring basis
Available-for-sale, at fair value	0	0	0
Residential mortgage-backed securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measurements Recurring [Member]
Summary of assets measured at fair value on a recurring basis
Available-for-sale, at fair value	219,601	239,807	288,738
Residential mortgage-backed securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value Measurements Recurring [Member]
Summary of assets measured at fair value on a recurring basis
Available-for-sale, at fair value	0	0	0
Collateralized mortgage obligations [Member]
Summary of assets measured at fair value on a recurring basis
Available-for-sale, at fair value	133,300	144,383	166,719
Collateralized mortgage obligations [Member] | Fair Value Measurements Recurring [Member]
Summary of assets measured at fair value on a recurring basis
Available-for-sale, at fair value	133,300	144,383	166,719
Collateralized mortgage obligations [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Fair Value Measurements Recurring [Member]
Summary of assets measured at fair value on a recurring basis
Available-for-sale, at fair value	0	0	0
Collateralized mortgage obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measurements Recurring [Member]
Summary of assets measured at fair value on a recurring basis
Available-for-sale, at fair value	133,300	144,383	166,719
Collateralized mortgage obligations [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value Measurements Recurring [Member]
Summary of assets measured at fair value on a recurring basis
Available-for-sale, at fair value	0	0	0
Corporate bonds [Member]
Summary of assets measured at fair value on a recurring basis
Available-for-sale, at fair value	34,997	45,095	65,415
Corporate bonds [Member] | Fair Value Measurements Recurring [Member]
Summary of assets measured at fair value on a recurring basis
Available-for-sale, at fair value	34,997	45,095	65,415
Corporate bonds [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Fair Value Measurements Recurring [Member]
Summary of assets measured at fair value on a recurring basis
Available-for-sale, at fair value	0	0	0
Corporate bonds [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measurements Recurring [Member]
Summary of assets measured at fair value on a recurring basis
Available-for-sale, at fair value	34,997	45,095	65,415
Corporate bonds [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value Measurements Recurring [Member]
Summary of assets measured at fair value on a recurring basis
Available-for-sale, at fair value	0	0	0
Preferred stock [Member]
Summary of assets measured at fair value on a recurring basis
Available-for-sale, at fair value	1,692	1,590	1,559
Preferred stock [Member] | Fair Value Measurements Recurring [Member]
Summary of assets measured at fair value on a recurring basis
Available-for-sale, at fair value	1,692	1,590	1,559
Preferred stock [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Fair Value Measurements Recurring [Member]
Summary of assets measured at fair value on a recurring basis
Available-for-sale, at fair value	0	0	0
Preferred stock [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measurements Recurring [Member]
Summary of assets measured at fair value on a recurring basis
Available-for-sale, at fair value	1,692	1,590	1,559
Preferred stock [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value Measurements Recurring [Member]
Summary of assets measured at fair value on a recurring basis
Available-for-sale, at fair value	$ 0	$ 0	$ 0

XML

Loans (Summary of the Aging Status of the Recorded Investment in Loans by Portfolio Segment/Class) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Originated Portfolio [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	$ 22,816	$ 20,595	$ 14,824
Financing receivable, recorded investment 61 to 89 days past due	3,625	3,352	4,637
Financing receivable, recorded investment accruing loans past due 90 days or more	801	2,073	1,395
Financing receivable, recorded investment, Nonaccrual loans	53,440	50,644	57,687
Financing receivable recorded investment, Total past due	80,682	76,664	78,543
Financing receivable, recorded investment, current	4,967,980	4,913,403	4,385,922
Financing receivable, recorded investment, Total loans	5,048,662	4,990,067	4,464,465
Originated Portfolio [Member] | Commercial [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	10,121	4,033	6,003
Financing receivable, recorded investment 61 to 89 days past due	729	743	1,832
Financing receivable, recorded investment accruing loans past due 90 days or more	52	170	43
Financing receivable, recorded investment, Nonaccrual loans	18,904	16,418	18,251
Financing receivable recorded investment, Total past due	29,806	21,364	26,129
Financing receivable, recorded investment, current	1,235,101	1,234,534	1,104,992
Financing receivable, recorded investment, Total loans	1,264,907	1,255,898	1,131,121
Originated Portfolio [Member] | Real estate commercial [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	7,238	7,515	4,094
Financing receivable, recorded investment 61 to 89 days past due	2,267	1,383	1,098
Financing receivable, recorded investment accruing loans past due 90 days or more	148	0	730
Financing receivable, recorded investment, Nonaccrual loans	24,766	24,966	27,568
Financing receivable recorded investment, Total past due	34,419	33,864	33,490
Financing receivable, recorded investment, current	1,237,929	1,170,562	1,095,228
Financing receivable, recorded investment, Total loans	1,272,348	1,204,426	1,128,718
Originated Portfolio [Member] | Real estate construction [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	340	262	18
Financing receivable, recorded investment 61 to 89 days past due	0	0	0
Financing receivable, recorded investment accruing loans past due 90 days or more	0	0	0
Financing receivable, recorded investment, Nonaccrual loans	663	162	160
Financing receivable recorded investment, Total past due	1,003	424	178
Financing receivable, recorded investment, current	94,920	138,316	72,227
Financing receivable, recorded investment, Total loans	95,923	138,740	72,405
Originated Portfolio [Member] | Land development [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	0	0	0
Financing receivable, recorded investment 61 to 89 days past due	0	0	0
Financing receivable, recorded investment accruing loans past due 90 days or more	0	0	0
Financing receivable, recorded investment, Nonaccrual loans	290	225	2,267
Financing receivable recorded investment, Total past due	290	225	2,267
Financing receivable, recorded investment, current	3,972	4,303	5,499
Financing receivable, recorded investment, Total loans	4,262	4,528	7,766
Originated Portfolio [Member] | Real estate residential [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	1,246	2,126	1,259
Financing receivable, recorded investment 61 to 89 days past due	88	54	1,138
Financing receivable, recorded investment accruing loans past due 90 days or more	172	557	0
Financing receivable, recorded investment, Nonaccrual loans	6,514	6,706	6,589
Financing receivable recorded investment, Total past due	8,020	9,443	8,986
Financing receivable, recorded investment, current	999,552	988,558	941,815
Financing receivable, recorded investment, Total loans	1,007,572	998,001	950,801
Originated Portfolio [Member] | Consumer installment [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	2,143	3,620	1,950
Financing receivable, recorded investment 61 to 89 days past due	344	512	313
Financing receivable, recorded investment accruing loans past due 90 days or more	0	0	0
Financing receivable, recorded investment, Nonaccrual loans	433	500	806
Financing receivable recorded investment, Total past due	2,920	4,632	3,069
Financing receivable, recorded investment, current	832,439	814,746	670,721
Financing receivable, recorded investment, Total loans	835,359	819,378	673,790
Originated Portfolio [Member] | Home equity [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	1,728	3,039	1,500
Financing receivable, recorded investment 61 to 89 days past due	197	660	256
Financing receivable, recorded investment accruing loans past due 90 days or more	429	1,346	622
Financing receivable, recorded investment, Nonaccrual loans	1,870	1,667	2,046
Financing receivable recorded investment, Total past due	4,224	6,712	4,424
Financing receivable, recorded investment, current	564,067	562,384	495,440
Financing receivable, recorded investment, Total loans	568,291	569,096	499,864
Acquired Portfolio [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	2,299	2,994	98
Financing receivable, recorded investment 61 to 89 days past due	378	461	0
Financing receivable, recorded investment accruing loans past due 90 days or more	11,231	19,892	11,523
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	13,908	23,347	11,621
Financing receivable, recorded investment, current	640,304	674,816	277,203
Financing receivable, recorded investment, Total loans	654,212	698,163	288,824
Acquired Portfolio [Member] | Commercial [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	59	133	0
Financing receivable, recorded investment 61 to 89 days past due	5	0	0
Financing receivable, recorded investment accruing loans past due 90 days or more	2,089	5,427	6,496
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	2,153	5,560	6,496
Financing receivable, recorded investment, current	89,109	93,423	71,024
Financing receivable, recorded investment, Total loans	91,262	98,983	77,520
Acquired Portfolio [Member] | Real estate commercial [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	1,784	2,014	0
Financing receivable, recorded investment 61 to 89 days past due	138	352	0
Financing receivable, recorded investment accruing loans past due 90 days or more	6,271	11,052	2,549
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	8,193	13,418	2,549
Financing receivable, recorded investment, current	336,382	339,804	147,900
Financing receivable, recorded investment, Total loans	344,575	353,222	150,449
Acquired Portfolio [Member] | Real estate construction [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	0	0	0
Financing receivable, recorded investment 61 to 89 days past due	0	0	0
Financing receivable, recorded investment accruing loans past due 90 days or more	0	0	0
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	0	0	0
Financing receivable, recorded investment, current	0	14,005	12,679
Financing receivable, recorded investment, Total loans	0	14,005	12,679
Acquired Portfolio [Member] | Land development [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	0	0	0
Financing receivable, recorded investment 61 to 89 days past due	0	0	0
Financing receivable, recorded investment accruing loans past due 90 days or more	1,537	1,653	2,089
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	1,537	1,653	2,089
Financing receivable, recorded investment, current	7,117	12,569	3,906
Financing receivable, recorded investment, Total loans	8,654	14,222	5,995
Acquired Portfolio [Member] | Real estate residential [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	104	156	0
Financing receivable, recorded investment 61 to 89 days past due	0	0	0
Financing receivable, recorded investment accruing loans past due 90 days or more	868	18	58
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	972	174	58
Financing receivable, recorded investment, current	108,901	112,215	11,150
Financing receivable, recorded investment, Total loans	109,873	112,389	11,208
Acquired Portfolio [Member] | Consumer installment [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	3	55	49
Financing receivable, recorded investment 61 to 89 days past due	1	3	0
Financing receivable, recorded investment accruing loans past due 90 days or more	11	454	0
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	15	512	49
Financing receivable, recorded investment, current	8,692	9,680	1,573
Financing receivable, recorded investment, Total loans	8,707	10,192	1,622
Acquired Portfolio [Member] | Home equity [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	349	636	49
Financing receivable, recorded investment 61 to 89 days past due	234	106	0
Financing receivable, recorded investment accruing loans past due 90 days or more	455	1,288	331
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	1,038	2,030	380
Financing receivable, recorded investment, current	90,103	93,120	28,971
Financing receivable, recorded investment, Total loans	$ 91,141	$ 95,150	$ 29,351

XML

Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Operating Activities
Net income	$ 17,835	$ 13,813
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	1,500	1,600
Gains on sales of loans	(1,589)	(647)
Proceeds from sales of loans	54,280	22,080
Loans originated for sale	(53,238)	(20,028)
Net gains from sales/writedowns of other real estate and repossessed assets	(570)	(379)
Depreciation of premises and equipment	2,479	2,119
Amortization of intangible assets	1,825	695
Gain on sale of investment securities	(579)	0
Net amortization of premiums and discounts on investment securities	1,373	1,093
Share-based compensation expense	755	554
Net increase in interest receivable and other assets	(9,562)	(1,319)
Net increase (decrease) in interest payable and other liabilities	(7,038)	1,239
Net cash provided by operating activities	7,471	20,820
Investment securities – available-for-sale:
Proceeds from sales	13,172	0
Proceeds from maturities, calls and principal reductions	57,449	28,426
Investment securities – held-to-maturity:
Proceeds from maturities, calls and principal reductions	7,542	31,798
Purchases	(72,748)	(36,309)
Net increase in loans	(20,233)	(109,965)
Proceeds from sales of other real estate and repossessed assets	3,693	2,197
Purchases of premises and equipment, net of disposals	(1,469)	(1,590)
Net cash used in investing activities	(12,594)	(85,443)
Financing Activities
Net increase in interest- and noninterest-bearing demand deposits and savings accounts	247,244	78,246
Net increase (decrease) in time deposits	(5,862)	30,662
Net increase (decrease) in short-term borrowings	(17,231)	33,803
Cash dividends paid	(7,899)	(6,881)
Proceeds from directors’ stock plans and exercise of stock options, net of shares withheld	447	867
Cash paid for payroll taxes upon conversion of share-based awards	(658)	(477)
Net cash provided by financing activities	216,041	136,220
Net increase in cash and cash equivalents	210,918	71,597
Cash and cash equivalents at beginning of period	183,020	310,788
Cash and cash equivalents at end of period	393,938	382,385
Supplemental Disclosure of Cash Flow Information:
Interest paid	3,426	3,858
Loans transferred to other real estate and repossessed assets	3,662	2,098
Income Taxes Paid	$ 9,800	$ 0

XML

Fair Value Measurements (Fair Value of Assets on a Nonrecurring Basis) (Details) (Fair Value Measurements Nonrecurring [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Summary of assets measured at fair value on a nonrecurring basis
Total assets measured at fair value on a nonrecurring basis	$ 46,589	$ 44,219	$ 39,517
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Summary of assets measured at fair value on a nonrecurring basis
Total assets measured at fair value on a nonrecurring basis	0	0	0
Significant Other Observable Inputs (Level 2) [Member]
Summary of assets measured at fair value on a nonrecurring basis
Total assets measured at fair value on a nonrecurring basis	0	0	0
Significant Unobservable Inputs (Level 3) [Member]
Summary of assets measured at fair value on a nonrecurring basis
Total assets measured at fair value on a nonrecurring basis	46,589	44,219	39,517
Impaired originated loans [Member]
Summary of assets measured at fair value on a nonrecurring basis
Total assets measured at fair value on a nonrecurring basis	23,730	21,323	29,461
Impaired originated loans [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Summary of assets measured at fair value on a nonrecurring basis
Total assets measured at fair value on a nonrecurring basis	0	0	0
Impaired originated loans [Member] | Significant Other Observable Inputs (Level 2) [Member]
Summary of assets measured at fair value on a nonrecurring basis
Total assets measured at fair value on a nonrecurring basis	0	0	0
Impaired originated loans [Member] | Significant Unobservable Inputs (Level 3) [Member]
Summary of assets measured at fair value on a nonrecurring basis
Total assets measured at fair value on a nonrecurring basis	23,730	21,323	29,461
Other real estate/repossessed assets [Member]
Summary of assets measured at fair value on a nonrecurring basis
Total assets measured at fair value on a nonrecurring basis	14,744	14,205	10,056
Other real estate/repossessed assets [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Summary of assets measured at fair value on a nonrecurring basis
Total assets measured at fair value on a nonrecurring basis	0	0	0
Other real estate/repossessed assets [Member] | Significant Other Observable Inputs (Level 2) [Member]
Summary of assets measured at fair value on a nonrecurring basis
Total assets measured at fair value on a nonrecurring basis	0	0	0
Other real estate/repossessed assets [Member] | Significant Unobservable Inputs (Level 3) [Member]
Summary of assets measured at fair value on a nonrecurring basis
Total assets measured at fair value on a nonrecurring basis	14,744	14,205	10,056
Mortgage Servicing Rights [Member]
Summary of assets measured at fair value on a nonrecurring basis
Total assets measured at fair value on a nonrecurring basis	8,115	8,691
Mortgage Servicing Rights [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Summary of assets measured at fair value on a nonrecurring basis
Total assets measured at fair value on a nonrecurring basis	0	0
Mortgage Servicing Rights [Member] | Significant Other Observable Inputs (Level 2) [Member]
Summary of assets measured at fair value on a nonrecurring basis
Total assets measured at fair value on a nonrecurring basis	0	0
Mortgage Servicing Rights [Member] | Significant Unobservable Inputs (Level 3) [Member]
Summary of assets measured at fair value on a nonrecurring basis
Total assets measured at fair value on a nonrecurring basis	$ 8,115	$ 8,691

XML

Loans (Summary of Recorded Investment of Consumer Loans by Risk Rating Categories) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Recorded investment of loans in consumer loan portfolio based on credit risk profile of loans in performing and nonperforming status
Recorded investment (loan balance), Consumer, Total	$ 2,620,943	$ 2,604,206	$ 2,166,636
Real estate residential [Member]
Recorded investment of loans in consumer loan portfolio based on credit risk profile of loans in performing and nonperforming status
Recorded investment (loan balance), Consumer, Total	1,117,445	1,110,390	962,009
Consumer installment [Member]
Recorded investment of loans in consumer loan portfolio based on credit risk profile of loans in performing and nonperforming status
Recorded investment (loan balance), Consumer, Total	844,066	829,570	675,412
Home equity [Member]
Recorded investment of loans in consumer loan portfolio based on credit risk profile of loans in performing and nonperforming status
Recorded investment (loan balance), Consumer, Total	659,432	664,246	529,215
Originated Loans [Member]
Recorded investment of loans in consumer loan portfolio based on credit risk profile of loans in performing and nonperforming status
Recorded investment (loan balance), Consumer, Total	2,411,222	2,386,475	2,124,455
Originated Loans [Member] | Real estate residential [Member]
Recorded investment of loans in consumer loan portfolio based on credit risk profile of loans in performing and nonperforming status
Recorded investment (loan balance), Consumer, Total	1,007,572	998,001	950,801
Originated Loans [Member] | Consumer installment [Member]
Recorded investment of loans in consumer loan portfolio based on credit risk profile of loans in performing and nonperforming status
Recorded investment (loan balance), Consumer, Total	835,359	819,378	673,790
Originated Loans [Member] | Home equity [Member]
Recorded investment of loans in consumer loan portfolio based on credit risk profile of loans in performing and nonperforming status
Recorded investment (loan balance), Consumer, Total	568,291	569,096	499,864
Originated Loans [Member] | Performing [Member]
Recorded investment of loans in consumer loan portfolio based on credit risk profile of loans in performing and nonperforming status
Recorded investment (loan balance), Consumer, Total	2,399,114	2,372,503	2,108,148
Originated Loans [Member] | Performing [Member] | Real estate residential [Member]
Recorded investment of loans in consumer loan portfolio based on credit risk profile of loans in performing and nonperforming status
Recorded investment (loan balance), Consumer, Total	998,196	987,542	937,968
Originated Loans [Member] | Performing [Member] | Consumer installment [Member]
Recorded investment of loans in consumer loan portfolio based on credit risk profile of loans in performing and nonperforming status
Recorded investment (loan balance), Consumer, Total	834,926	818,878	672,984
Originated Loans [Member] | Performing [Member] | Home equity [Member]
Recorded investment of loans in consumer loan portfolio based on credit risk profile of loans in performing and nonperforming status
Recorded investment (loan balance), Consumer, Total	565,992	566,083	497,196
Originated Loans [Member] | Nonperforming [Member]
Recorded investment of loans in consumer loan portfolio based on credit risk profile of loans in performing and nonperforming status
Recorded investment (loan balance), Consumer, Total	12,108	13,972	16,307
Originated Loans [Member] | Nonperforming [Member] | Real estate residential [Member]
Recorded investment of loans in consumer loan portfolio based on credit risk profile of loans in performing and nonperforming status
Recorded investment (loan balance), Consumer, Total	9,376	10,459	12,833
Originated Loans [Member] | Nonperforming [Member] | Consumer installment [Member]
Recorded investment of loans in consumer loan portfolio based on credit risk profile of loans in performing and nonperforming status
Recorded investment (loan balance), Consumer, Total	433	500	806
Originated Loans [Member] | Nonperforming [Member] | Home equity [Member]
Recorded investment of loans in consumer loan portfolio based on credit risk profile of loans in performing and nonperforming status
Recorded investment (loan balance), Consumer, Total	2,299	3,013	2,668
Acquired Loans [Member]
Recorded investment of loans in consumer loan portfolio based on credit risk profile of loans in performing and nonperforming status
Recorded investment (loan balance), Consumer, Total	209,721	217,731	42,181
Acquired Loans [Member] | Real estate residential [Member]
Recorded investment of loans in consumer loan portfolio based on credit risk profile of loans in performing and nonperforming status
Recorded investment (loan balance), Consumer, Total	109,873	112,389	11,208
Acquired Loans [Member] | Consumer installment [Member]
Recorded investment of loans in consumer loan portfolio based on credit risk profile of loans in performing and nonperforming status
Recorded investment (loan balance), Consumer, Total	8,707	10,192	1,622
Acquired Loans [Member] | Home equity [Member]
Recorded investment of loans in consumer loan portfolio based on credit risk profile of loans in performing and nonperforming status
Recorded investment (loan balance), Consumer, Total	91,141	95,150	29,351
Acquired Loans [Member] | Performing [Member]
Recorded investment of loans in consumer loan portfolio based on credit risk profile of loans in performing and nonperforming status
Recorded investment (loan balance), Consumer, Total	208,387	215,971	41,792
Acquired Loans [Member] | Performing [Member] | Real estate residential [Member]
Recorded investment of loans in consumer loan portfolio based on credit risk profile of loans in performing and nonperforming status
Recorded investment (loan balance), Consumer, Total	109,005	111,101	11,150
Acquired Loans [Member] | Performing [Member] | Consumer installment [Member]
Recorded investment of loans in consumer loan portfolio based on credit risk profile of loans in performing and nonperforming status
Recorded investment (loan balance), Consumer, Total	8,696	10,174	1,622
Acquired Loans [Member] | Performing [Member] | Home equity [Member]
Recorded investment of loans in consumer loan portfolio based on credit risk profile of loans in performing and nonperforming status
Recorded investment (loan balance), Consumer, Total	90,686	94,696	29,020
Acquired Loans [Member] | Nonperforming [Member]
Recorded investment of loans in consumer loan portfolio based on credit risk profile of loans in performing and nonperforming status
Recorded investment (loan balance), Consumer, Total	1,334	1,760	389
Acquired Loans [Member] | Nonperforming [Member] | Real estate residential [Member]
Recorded investment of loans in consumer loan portfolio based on credit risk profile of loans in performing and nonperforming status
Recorded investment (loan balance), Consumer, Total	868	1,288	58
Acquired Loans [Member] | Nonperforming [Member] | Consumer installment [Member]
Recorded investment of loans in consumer loan portfolio based on credit risk profile of loans in performing and nonperforming status
Recorded investment (loan balance), Consumer, Total	11	18	0
Acquired Loans [Member] | Nonperforming [Member] | Home equity [Member]
Recorded investment of loans in consumer loan portfolio based on credit risk profile of loans in performing and nonperforming status
Recorded investment (loan balance), Consumer, Total	$ 455	$ 454	$ 331

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Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2015

Fair Value Disclosures [Abstract]

Summary of assets measured at fair value on a recurring basis

For assets measured at fair value on a recurring basis, quantitative disclosures about the fair value measurements for each major category of assets were as follows:

	Fair Value Measurements – Recurring Basis
	Quoted Prices In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(In thousands)
March 31, 2015
Investment securities – available-for-sale:
U.S. Treasury securities	$	8,302	$	—	$	—	$	8,302
Government sponsored agencies	—		250,430		—		250,430
State and political subdivisions	—		32,322		—		32,322
Residential mortgage-backed securities	—		219,601		—		219,601
Collateralized mortgage obligations	—		133,300		—		133,300
Corporate bonds	—		34,997		—		34,997
Preferred stock	—		1,692		—		1,692
Total investment securities – available-for-sale	8,302		672,342		—		680,644
Loans held-for-sale	—		9,675		—		9,675
Total assets measured at fair value on a recurring basis	$	8,302	$	682,017	$	—	$	690,319
December 31, 2014
Investment securities – available-for-sale:
U.S. Treasury securities	$	8,259	$	—	$	—	$	8,259
Government sponsored agencies	—		263,503		—		263,503
State and political subdivisions	—		46,227		—		46,227
Residential mortgage-backed securities	—		239,807		—		239,807
Collateralized mortgage obligations	—		144,383		—		144,383
Corporate bonds	—		45,095		—		45,095
Preferred stock	—		1,590		—		1,590
Total investment securities – available-for-sale	8,259		740,605		—		748,864
Loans held-for-sale	—		9,128		—		9,128
Total assets measured at fair value on a recurring basis	$	8,259	$	749,733	$	—	$	757,992
March 31, 2014
Investment securities – available-for-sale:
Government sponsored agencies	$	—	$	91,610	$	—	$	91,610
State and political subdivisions	—		43,777		—		43,777
Residential mortgage-backed securities	—		288,738		—		288,738
Collateralized mortgage obligations	—		166,719		—		166,719
Corporate bonds	—		65,415		—		65,415
Preferred stock	—		1,559		—		1,559
Total investment securities – available-for-sale	—		657,818		—		657,818
Loans held-for-sale	—		3,814		—		3,814
Total assets measured at fair value on a recurring basis	$	—	$	661,632	$	—	$	661,632

Summary of assets measured at fair value on a nonrecurring basis

For assets measured at fair value on a nonrecurring basis, quantitative disclosures about fair value measurements for each major category of assets were as follows:

	Fair Value Measurements – Nonrecurring Basis
	Quoted Prices In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(In thousands)
March 31, 2015
Impaired originated loans	$	—	$	—	$	23,730	$	23,730
Other real estate/repossessed assets	—		—		14,744		14,744
Mortgage servicing rights	—		—		8,115		8,115
Total	$	—	$	—	$	46,589	$	46,589
December 31, 2014
Impaired originated loans	$	—	$	—	$	21,323	$	21,323
Other real estate/repossessed assets	—		—		14,205		14,205
Mortgage servicing rights	—		—		8,691		8,691
Total	$	—	$	—	$	44,219	$	44,219
March 31, 2014
Impaired originated loans	$	—	$	—	$	29,461	$	29,461
Other real estate/repossessed assets	—		—		10,056		10,056
Total	$	—	$	—	$	39,517	$	39,517

Summary of carrying amounts and estimated fair values of the financial instruments

A summary of carrying amounts and estimated fair values of the Corporation’s financial instruments included in the consolidated statements of financial position was as follows:

	Level in Fair Value Measurement Hierarchy	March 31, 2015				December 31, 2014				March 31, 2014
		Carrying Amount		Fair Value		Carrying Amount		Fair Value		Carrying Amount		Fair Value
		(In thousands)
Assets:
Cash and cash equivalents	Level 1	$	393,938	$	393,938	$	183,020	$	183,020	$	382,385	$	382,385
Investment securities:
Available-for-sale	Level 1	8,302		8,302		8,259		8,259		—		—
Available-for-sale	Level 2	672,342		672,342		740,605		740,605		657,818		657,818
Held-to-maturity	Level 2	370,950		372,876		305,913		308,650		267,599		265,947
Held-to-maturity	Level 3	10,500		7,300		10,500		7,090		10,500		6,460
Nonmarketable equity securities	NA	31,249		31,249		27,369		27,369		25,572		25,572
Loans held-for-sale	Level 2	9,675		9,675		9,128		9,128		3,814		3,814
Net loans	Level 3	5,627,618		5,633,217		5,612,547		5,623,454		4,674,816		4,688,814
Interest receivable	Level 2	19,816		19,816		17,492		17,492		16,945		16,945
Liabilities:
Deposits without defined maturities	Level 2	$	4,988,268	$	4,988,268	$	4,741,024	$	4,741,024	$	3,868,700	$	3,868,700
Time deposits	Level 3	1,332,085		1,335,605		1,337,947		1,340,015		1,362,593		1,371,312
Interest payable	Level 2	779		779		755		755		876		876
Short-term borrowings	Level 2	372,236		372,236		389,467		389,467		361,231		361,231

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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

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Intangible Assets (Activity for Capitalized MSRs) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Capitalized MSRs [Roll Forward]
Balance at beginning of period	$ 33,080
Amortization	(1,825)	(695)
Balance at end of period	31,655	12,872
Mortgage servicing rights [Member]
Capitalized MSRs [Roll Forward]
Balance at beginning of period	12,217	3,423
Additions	400	143
Amortization	(1,034)	(250)
Balance at end of period	$ 11,583	$ 3,316

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Loans (Summary of Nonperforming Loans) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Summary of nonperforming loans
Total TDRs	$ 101,824	$ 101,322	$ 103,671
Total loans	5,702,874	5,688,230	4,753,289
Minimum number of days accruing loans past due move to nonaccrual status	90 days
Commercial Loan Portfolio [Member]
Summary of nonperforming loans
Total TDRs	77,511	77,047	79,852
Total loans	3,081,931	3,084,024	2,586,653
Consumer Loan Portfolio [Member]
Summary of nonperforming loans
Total TDRs	24,313	24,275	23,819
Total loans	2,620,943	2,604,206	2,166,636
Nonperforming [Member]
Summary of nonperforming loans
Total nonaccrual loans	53,440	50,644	57,687
Total accruing loans contractually past due 90 days or more as to interest or principal payments	801	2,073	1,395
Total TDRs	18,500	18,467	17,462
Total loans	72,741	71,184	76,544
Nonperforming [Member] | Commercial Loan Portfolio [Member]
Summary of nonperforming loans
Total TDRs	15,810	15,271	11,218
Nonperforming [Member] | Consumer Loan Portfolio [Member]
Summary of nonperforming loans
Total TDRs	2,690	3,196	6,244
Nonperforming [Member] | Commercial [Member]
Summary of nonperforming loans
Total nonaccrual loans	18,904	16,418	18,251
Total accruing loans contractually past due 90 days or more as to interest or principal payments	52	170	43
Nonperforming [Member] | Real estate commercial [Member]
Summary of nonperforming loans
Total nonaccrual loans	24,766	24,966	27,568
Total accruing loans contractually past due 90 days or more as to interest or principal payments	148	0	730
Nonperforming [Member] | Real Estate Construction Loans [Member]
Summary of nonperforming loans
Total nonaccrual loans	663	162	160
Total accruing loans contractually past due 90 days or more as to interest or principal payments	0	0	0
Nonperforming [Member] | Land Development Loans [Member]
Summary of nonperforming loans
Total nonaccrual loans	290	225	2,267
Total accruing loans contractually past due 90 days or more as to interest or principal payments	0	0	0
Nonperforming [Member] | Real estate residential [Member]
Summary of nonperforming loans
Total nonaccrual loans	6,514	6,706	6,589
Total accruing loans contractually past due 90 days or more as to interest or principal payments	172	557	0
Nonperforming [Member] | Consumer Installment Loans [Member]
Summary of nonperforming loans
Total nonaccrual loans	433	500	806
Total accruing loans contractually past due 90 days or more as to interest or principal payments	0	0	0
Nonperforming [Member] | Home Equity Loans [Member]
Summary of nonperforming loans
Total nonaccrual loans	1,870	1,667	2,046
Total accruing loans contractually past due 90 days or more as to interest or principal payments	$ 429	$ 1,346	$ 622

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Earnings Per Common Share (Tables)

3 Months Ended

Mar. 31, 2015

Earnings Per Share [Abstract]

Numerator and denominator of the basic and diluted earnings per common share computations

The following summarizes the numerator and denominator of the basic and diluted earnings per common share computations:

	Three Months Ended March 31,
	2015		2014
	(In thousands, except per share data)
Numerator for both basic and diluted earnings per common share, net income	$	17,835	$	13,813
Denominator for basic earnings per common share, weighted average common shares outstanding	32,809		29,825
Weighted average common stock equivalents	235		212
Denominator for diluted earnings per common share	33,044		30,037
Basic earnings per common share	$	0.54	$	0.46
Diluted earnings per common share	0.54		0.46

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Share-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of activity for Corporation's stock options

A summary of activity for the Corporation’s stock options as of and for the three months ended March 31, 2015 is presented below:

	Non-Vested Stock Options Outstanding						Stock Options Outstanding
	Number of Options		Weighted- Average Exercise Price Per Share		Weighted- Average Grant Date Fair Value Per Share		Number of Options		Weighted- Average Exercise Price Per Share
Outstanding at December 31, 2014	432,199		$	26.75	$	8.30	1,037,311		$	25.90
Granted	244,165		30.18		8.40		244,165		30.18
Exercised	—		—		—		(37,191	)	23.11
Vested	(150,224	)	25.57		7.80		—		—
Forfeited/expired	(3,049	)	27.42		8.59		(3,049	)	27.42
Outstanding at March 31, 2015	523,091		$	28.69	$	8.49	1,241,236		$	26.82
Exercisable/vested at March 31, 2015							718,145		$	25.46

Assumptions of Black-Scholes option pricing model

The fair value of the stock options granted during the three months ended March 31, 2015 was estimated on the date of grant using the Black-Scholes option pricing model with the following assumptions.

Expected dividend yield	3.50		%
Risk-free interest rate	1.78		%
Expected stock price volatility	39.1		%
Expected life of options – in years	7.0
Weighted average fair value of options granted	$	8.40

Summary of activity for restricted stock performance units

A summary of the activity for restricted stock units as of and for the three months ended March 31, 2015 is presented below:

	Number of Units		Weighted- Average Grant Date Fair Value  Per Unit
Outstanding at December 31, 2014	204,319		$	24.14
Granted	76,286		28.15
Converted into shares of common stock	(66,769	)	22.32
Forfeited/expired	(405	)	25.17
Outstanding at March 31, 2015	213,431		$	26.14

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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parenthetical) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Cash dividends declared per share	$ 0.24	$ 0.23

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Pension and Other Postretirement Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2015

Compensation and Retirement Disclosure [Abstract]

Components of net periodic benefit cost (income) for the Corporation's qualified and nonqualified pension plans and nonqualified postretirement benefits plan

The components of net periodic benefit cost for the Corporation’s qualified and nonqualified pension plans and nonqualified postretirement benefit plan are as follows:

	Three Months Ended March 31,
	2015			2014
	(In thousands)
Defined Benefit Pension Plans
Service cost	$	273		$	250
Interest cost	1,332			1,312
Expected return on plan assets	(2,161		)	(2,078		)
Amortization of prior service credit	(1		)	—
Amortization of unrecognized net loss	1,056			569
Net periodic benefit cost	$	499		$	53
Postretirement Benefit Plan
Service cost	$	4		$	5
Interest cost	33			35
Amortization of prior service cost	32			32
Amortization of unrecognized net gain	—			(26		)
Net periodic benefit cost	$	69		$	46

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Investment Securities (Textual) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Trust preferred investment securities held to maturity	$ 10.5
Trust preferred investment security of Non Public bank company	10.0
Interest in Trust preferred investment security	100.00%
Remaining trust preferred investment security of Non Public bank company	0.5
Interest in another trust preferred investment security	10.00%
Carrying value of trust preferred investment security one	10.0
Carrying value of trust preferred investment security two	0.5
Fair value of trust preferred investment security one	7.0
Fair value of trust preferred investment security two	0.3
Unrealized loss on trust preferred investment securities	3.2
Unrealized loss on trust preferred securities.	$ 3.2

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Intangible Assets (Net Carrying Value) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Net carrying value of intangible assets
Goodwill	$ 180,128	$ 180,128	$ 120,164
Other intangible assets:
Total other intangible assets	31,655	33,080	12,872
Core deposit intangible assets [Member]
Other intangible assets:
Total other intangible assets	20,072	20,863	9,556
Mortgage servicing rights [Member]
Other intangible assets:
Total other intangible assets	$ 11,583	$ 12,217	$ 3,316	$ 3,423

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Financial Guarantees (Textual) (Details) (Financial Standby Letter of Credit [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Financial Standby Letter of Credit [Member]
Financial Guarantees (Textual) [Abstract]
Letters of credit outstanding	$ 38	$ 41	$ 45
Expiration period for letters of credit, maximum	5 years

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Consolidated Statements of Financial Position (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Cash and cash equivalents:
Cash and cash due from banks	$ 121,796	$ 144,892	$ 122,288
Interest-bearing deposits with the Federal Reserve Bank and other banks	272,142	38,128	260,097
Total cash and cash equivalents	393,938	183,020	382,385
Investment securities:
Available-for-sale, at fair value	680,644	748,864	657,818
Held-to-maturity (fair value - $380,176 at March 31, 2015, $315,740 at December 31, 2014 and $272,407 at March 31, 2014)	381,450	316,413	278,099
Total investment securities	1,062,094	1,065,277	935,917
Loans held-for-sale, at fair value	9,675	9,128	3,814
Loans	5,702,874	5,688,230	4,753,289
Allowance for loan losses	(75,256)	(75,683)	(78,473)
Net loans	5,627,618	5,612,547	4,674,816
Premises and equipment (net of accumulated depreciation of $111,270 at March 31, 2015, $108,826 at December 31, 2014 and $102,163 at March 31, 2014)	96,486	97,496	74,779
Goodwill	180,128	180,128	120,164
Other intangible assets	31,655	33,080	12,872
Interest receivable and other assets	150,041	141,467	133,581
Total Assets	7,551,635	7,322,143	6,338,328
Deposits:
Noninterest-bearing	1,614,319	1,591,661	1,219,081
Interest-bearing	4,706,034	4,487,310	4,012,212
Total deposits	6,320,353	6,078,971	5,231,293
Interest payable and other liabilities	48,545	56,572	40,209
Short-term borrowings	372,236	389,467	361,231
Total liabilities	6,741,134	6,525,010	5,632,733
Shareholders’ equity:
Preferred stock, no par value: Authorized - 200,000 shares, none issued	0	0	0
Issued and outstanding — 32,847,063 shares at March 31, 2015, 32,774,420 shares at December 31, 2014 and 29,865,841 shares at March 31, 2014	32,847	32,774	29,866
Additional paid-in capital	565,851	565,166	489,045
Retained earnings	241,582	231,646	205,985
Accumulated other comprehensive loss	(29,779)	(32,453)	(19,301)
Total shareholders’ equity	810,501	797,133	705,595
Total Liabilities and Shareholders’ Equity	$ 7,551,635	$ 7,322,143	$ 6,338,328

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Loans (Summary of Impaired Loans by Classes of Loans) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	$ 25,100	$ 23,234	$ 27,198
Unpaid Principal Balance	25,375	23,648	27,526
Related Valuation Allowance	1,912	1,338	2,065
Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	104,052	111,433	101,297
Unpaid Principal Balance	133,493	141,622	122,701
Related Valuation Allowance	0	0	0
Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	129,152	134,667	128,495
Unpaid Principal Balance	158,868	165,270	150,227
Related Valuation Allowance	1,912	1,338	2,065
Commercial [Member] | Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	3,433	966	3,534
Unpaid Principal Balance	3,527	1,040	3,704
Related Valuation Allowance	1,119	293	1,250
Commercial [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	33,733	38,094	38,150
Unpaid Principal Balance	39,382	44,557	42,914
Related Valuation Allowance	0	0	0
Commercial [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	37,166	39,060	41,684
Unpaid Principal Balance	42,909	45,597	46,618
Related Valuation Allowance	1,119	293	1,250
Real estate commercial [Member] | Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	1,780	2,587	3,720
Unpaid Principal Balance	1,961	2,927	3,878
Related Valuation Allowance	496	710	371
Real estate commercial [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	57,628	60,616	49,074
Unpaid Principal Balance	79,696	82,693	62,207
Related Valuation Allowance	0	0	0
Real estate commercial [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	59,408	63,203	52,794
Unpaid Principal Balance	81,657	85,620	66,085
Related Valuation Allowance	496	710	371
Real estate construction [Member] | Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	0	0	0
Unpaid Principal Balance	0	0	0
Related Valuation Allowance	0	0	0
Real estate construction [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	663	162	160
Unpaid Principal Balance	836	255	366
Related Valuation Allowance	0	0	0
Real estate construction [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	663	162	160
Unpaid Principal Balance	836	255	366
Related Valuation Allowance	0	0	0
Land development [Member] | Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	0	0	0
Unpaid Principal Balance	0	0	0
Related Valuation Allowance	0	0	0
Land development [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	1,877	1,928	4,472
Unpaid Principal Balance	3,428	3,484	7,773
Related Valuation Allowance	0	0	0
Land development [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	1,877	1,928	4,472
Unpaid Principal Balance	3,428	3,484	7,773
Related Valuation Allowance	0	0	0
Real estate residential [Member] | Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	19,887	19,681	19,944
Unpaid Principal Balance	19,887	19,681	19,944
Related Valuation Allowance	297	335	444
Real estate residential [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	7,382	7,994	6,589
Unpaid Principal Balance	7,382	7,994	6,589
Related Valuation Allowance	0	0	0
Real estate residential [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	27,269	27,675	26,533
Unpaid Principal Balance	27,269	27,675	26,533
Related Valuation Allowance	297	335	444
Consumer installment [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	444	518	806
Unpaid Principal Balance	444	518	806
Related Valuation Allowance	0	0	0
Consumer installment [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	444	518	806
Unpaid Principal Balance	444	518	806
Related Valuation Allowance	0	0	0
Home equity [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	2,325	2,121	2,046
Unpaid Principal Balance	2,325	2,121	2,046
Related Valuation Allowance	0	0	0
Home equity [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	2,325	2,121	2,046
Unpaid Principal Balance	2,325	2,121	2,046
Related Valuation Allowance	$ 0	$ 0	$ 0

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Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Tax expense (benefit) on net unrealized gains (losses) on investment securities available-for-sale	$ 1,262	$ 857
Tax expense (benefit) on reclassification adjustment for realized gains on sale of investment securities available-for-sale	(203)	0
Tax expense (benefit) on adjustment for pension and other postretirement benefits	$ 381	$ (201)

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Accumulated Other Comprehensive Loss (Textual) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Accumulated Other Comprehensive Loss (Textual) [Abstract]
Net unrealized gains (losses) on investment securities-available-for-sale, tax expense (benefit)	$ 946	$ (113)	$ (478)
Pension and other postretirement benefits adjustment, tax benefit	$ 16,981	$ 17,362	$ 9,915

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Acquisitions (Textual) (Details) (USD $)	0 Months Ended
	Jan. 05, 2015	Apr. 01, 2015	Oct. 31, 2014	Dec. 07, 2012 Branches	Apr. 30, 2010 Offices	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Business Acquisition [Line Items]
Goodwill						$ 180,128,000	$ 180,128,000	$ 120,164,000
Lake Michigan Financial Corp [Member]
Business Acquisition [Line Items]
Business Acquisition, Share Price	$ 16.64
Exchange Ratio of Common Stock Issued, Business Combinations	1.326
Acquisition purchase price	184,100,000
Monarch Community Bancorp [Member]
Business Acquisition [Line Items]
Exchange Ratio of Common Stock Issued, Business Combinations		0.0982
Business Combination, Acquired Receivables, Fair Value						128,000,000
Acquisition purchase price		27,200,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares		861,000
Assets of acquiree company						170,000,000
Deposits of acquiree company						143,000,000
Northwestern Bancorp [Member]
Business Acquisition [Line Items]
Expected Principal Cash Flows of Contractually Required Acquired Loan Portfolio			481,000,000
Expected Interest Cash Flows of Contractually Required Acquired Loan Portfolio			104,000,000
Business Combination, Acquired Receivables, Fair Value			475,000,000
Certain Loans Acquired in Transfer, Nonaccretable Difference			34,000,000
Acquisition purchase price			121,000,000
Goodwill			60,000,000
Intangibles acquired			12,900,000
Service provided by acquiree bank through number of branches			25
Assets of acquiree company			815,000,000
Deposits of acquiree company			794,000,000
Outstanding contractual principal balance of acquired loan portfolio						453,000,000	485,000,000
Carrying amount of acquired loan portfolio						421,000,000	452,000,000
Business Combination, Acquired Receivables, Gross Contractual Amount			507,000,000
Interest Payments Receivable of Acquired Loan Portfolio			112,000,000
Business Combination, Acquired Receivables, Estimated Uncollectible			26,000,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Disposals of Loans			110,000,000
Independent Bank [Member]
Business Acquisition [Line Items]
Number of branches acquired (branches)				21
Deposits acquired				404,000,000
Loans acquired				44,000,000
Acquisition purchase price				8,100,000
Premium paid on deposits purchased				11,500,000
Premium paid as a percentage of deposits purchased (percent)				2.85%
Discount on loans purchased (percent)				1.75%
Goodwill				6,800,000
Independent Bank [Member] | Core Deposits [Member]
Business Acquisition [Line Items]
Intangibles acquired				5,600,000
OAK [Member]
Business Acquisition [Line Items]
Loans acquired					627,000,000
Acquisition purchase price					83,700,000
Service provided by acquiree bank through number of branches					14
Assets of acquiree company					820,000,000
Deposits of acquiree company					693,000,000
Brokered deposits of acquiree company					193,000,000
Contractually required principal payments of loan portfolio, acquisition date					683,000,000
Acquired loan portfolio acquisition date fair value					627,000,000
Outstanding contractual principal balance of acquired loan portfolio						255,000,000	268,000,000	313,000,000
Carrying amount of acquired loan portfolio						$ 234,000,000	$ 246,000,000	$ 289,000,000

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Earnings Per Common Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Numerator and denominator of the basic and diluted earnings per common share computations
Numerator for both basic and diluted earnings per common share, net income	$ 17,835	$ 13,813
Denominator for basic earnings per common share, weighted average common shares outstanding	32,809,000	29,825,000
Weighted average common stock equivalents	235,000	212,000
Denominator for diluted earnings per common share	33,044,000	30,037,000
Basic earnings per common share (dollars per share)	$ 0.54	$ 0.46
Diluted earnings per common share (dollars per share)	$ 0.54	$ 0.46
Stock Option [Member]
Earnings Per Common Share (Textual) [Abstract]
Average number of exercisable employee stock option awards that were not included in the computation of diluted earnings per common share	121,050	259,288

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Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2015

Accounting Policies [Abstract]

Nature of Operations

Nature of Operations

Chemical Financial Corporation (Corporation) operates in a single operating segment — commercial banking. The Corporation is a financial holding company, headquartered in Midland, Michigan, that operated through one commercial bank, Chemical Bank, as of March 31, 2015. Monarch Community Bank was acquired in the April 1, 2015 acquisition of Monarch Community Bancorp, Inc. (Monarch). The Corporation intends to consolidate Monarch Community Bank with and into Chemical Bank during the second quarter of 2015. Chemical Bank operates within the State of Michigan as a state-chartered commercial bank. Chemical Bank operates through an internal organizational structure of four regional banking units and offers a full range of traditional banking and fiduciary products and services to the residents and business customers in the bank’s geographical market areas. The products and services offered by the regional banking units, through branch banking offices, are generally consistent throughout the Corporation, as is the pricing of those products and services. The marketing of products and services throughout the Corporation’s regional banking units is generally uniform, as many of the markets served by the regional banking units overlap. The distribution of products and services is uniform throughout the Corporation’s regional banking units and is achieved primarily through retail branch banking offices, automated teller machines and electronically accessed banking products.

The Corporation’s primary sources of revenue are interest from its loan products and investment securities, service charges and fees from customer deposit accounts and wealth management revenue.

Basis of Presentation

Basis of Presentation

The accompanying unaudited consolidated financial statements of the Corporation and its subsidiaries have been prepared in accordance with U.S. generally accepted accounting principles (GAAP) for interim financial information and the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, the interim consolidated financial statements do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with the Corporation’s consolidated financial statements and footnotes thereto included in the Corporation’s Annual Report on Form 10-K for the year ended December 31, 2014. In the opinion of management, the accompanying unaudited interim consolidated financial statements contain all adjustments believed necessary to present fairly the financial condition and results of operations of the Corporation for the periods presented. Operating results for the three months ended March 31, 2015 are not necessarily indicative of the results that may be expected for the year ending December 31, 2015.

Use of Estimates

Use of Estimates

Management makes estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying footnotes. Estimates that are particularly susceptible to significant change include the determination of the allowance for loan losses, expected cash flows from acquired loans, fair value amounts related to business combinations, pension expense, income taxes, goodwill impairment and those assets that require fair value measurement. Actual results could differ from these estimates.

Business Combinations Policy [Policy Text Block]

Business Combinations

Pursuant to the guidance of ASC Topic 805, Business Combinations (ASC 805), the Corporation recognizes assets acquired, including identified intangible assets, and the liabilities assumed in acquisitions at their fair values as of the acquisition date, with the acquisition-related transaction and restructuring costs expensed in the period incurred.

ASC 805 affords a measurement period beyond the acquisition date that allows the Corporation the opportunity to finalize the acquisition accounting in the event that new information is identified that existed as of the acquisition date but was not known by the Corporation at that time. The Corporation anticipates that measurement period adjustments may arise from adjustments to the fair values of assets and liabilities recognized at the acquisition date for Northwestern Bancorp, Inc. (Northwestern) as additional information is obtained, such as appraisals of collateral securing loans and other borrower information. In the event that a measurement period adjustment is identified, the Corporation will recognize the adjustment as part of its acquisition accounting, which may result in an adjustment to goodwill being recorded.

See Note 2 for further information regarding the Corporation's completed and pending acquisition transactions.

Originated Loans

Originated Loans

Originated loans include all of the Corporation's portfolio loans, excluding loans acquired on October 31, 2014 in the acquisition of Northwestern and on April 30, 2010 in the acquisition of O.A.K. Financial Corporation (OAK). Originated loans also include loans acquired as part of the Corporation's branch acquisition on December 7, 2012, as these loans were performing and were considered high-quality loans in accordance with the Corporation's credit underwriting standards at that date. Originated loans are stated at their principal amount outstanding, net of unearned income, charge-offs and unamortized deferred fees and costs. Loan interest income is recognized on the accrual basis. Deferred loan fees and costs are amortized over the loan term based on the level-yield method. Net loan commitment fees are deferred and amortized into fee income on a straight-line basis over the commitment period.

The past due status of a loan is based on the loan’s contractual terms. A loan is placed in nonaccrual status (accrual of interest is discontinued) when principal or interest is past due 90 days or more (except for a loan that is secured by residential real estate, which is transferred to nonaccrual status at 120 days past due), unless the loan is both well-secured and in the process of collection, or earlier when, in the opinion of management, there is sufficient reason to doubt the collectibility of principal or interest. Interest previously accrued, but not collected, is reversed and charged against interest income at the time the loan is placed in nonaccrual status. Subsequent receipts of interest while a loan is in nonaccrual status are recorded as a reduction of principal. Loans are returned to accrual status when principal and interest payments are brought current, payments have been received consistently for a period of time (generally six months) and collectibility is no longer in doubt.

Loans Acquired in a Business Combination

Loans Acquired in a Business Combination

Loans acquired in a business combination (acquired loans) consist of loans acquired on October 31, 2014 in the acquisition of Northwestern and on April 30, 2010 in the acquisition of OAK. Acquired loans were recorded at fair value at the date of acquisition, without a carryover of the associated allowance for loan losses related to these loans, through a fair value discount that was, in part, attributable to deterioration in credit quality. The estimate of expected credit losses was determined based on due diligence performed by executive and senior officers of the Corporation, with assistance from third-party consultants. The fair value discount was recorded as a reduction of the acquired loans’ outstanding principal balances in the consolidated statement of financial position at the acquisition date.

The Corporation accounts for acquired loans, which are recorded at fair value at acquisition, in accordance with Accounting Standards Codification (ASC) Topic 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality (ASC 310-30). ASC 310-30 allows investors to aggregate loans acquired into loan pools that have common risk characteristics and thereby use a composite interest rate and expectation of cash flows expected to be collected for the loan pools. Under the provisions of ASC 310-30, the Corporation aggregated acquired loans into 4 pools in the acquisition of Northwestern and 14 pools in the acquisition of OAK based upon common risk characteristics, including types of loans, commercial type loans with similar risk grades and whether loans were performing or nonperforming. A pool is considered a single unit of accounting for the purposes of applying the guidance prescribed in ASC 310-30. A loan will be removed from a pool of acquired loans only if the loan is sold, foreclosed, paid off or written off, and will be removed from the pool at the carrying value. If an individual loan is removed from a pool of loans, the difference between its relative carrying amount and the cash, fair value of the collateral, or other assets received would not affect the effective yield used to recognize the accretable difference on the remaining pool. The Corporation estimated the cash flows expected to be collected over the life of the pools of loans at acquisition and estimates expected cash flows quarterly thereafter, based on a set of assumptions including expectations as to default rates, prepayment rates and loss severities. The Corporation must make numerous assumptions, interpretations and judgments using internal and third-party credit quality information to determine whether it is probable that the Corporation will be able to collect all contractually required payments. This is a point in time assessment and inherently subjective due to the nature of the available information and judgment involved.

The calculation of the fair value of the acquired loan pools entails estimating the amount and timing of cash flows attributable to both principal and interest expected to be collected on such loan pools and then discounting those cash flows at market interest rates. The excess of a loan pool's expected cash flows at the acquisition date over its estimated fair value is referred to as the "accretable yield," which is recognized into interest income over the estimated remaining life of the loan pool on a level-yield basis. The difference between a loan pool's contractually required principal and interest payments at the acquisition date and the cash flows expected to be collected at the acquisition date is referred to as the "nonaccretable difference," which includes an estimate of future credit losses expected to be incurred over the estimated life of the loan pool and interest payments that are not expected to be collected. Decreases to the expected cash flows in each loan pool in subsequent periods will require the Corporation to record a provision for loan losses. Improvements in expected cash flows in each loan pool in subsequent periods will result in reversing a portion of the nonaccretable difference, which is then classified as part of the accretable yield and subsequently recognized into interest income over the estimated remaining life of the loan pool.

Loans Modified Under Troubled Debt Restructurings

Loans Modified Under Troubled Debt Restructurings

Loans modified under troubled debt restructurings (TDRs) involve granting a concession to a borrower who is experiencing financial difficulty. Concessions generally include modifications to original loan terms, including changes to a loan’s payment schedule or interest rate, which generally would not otherwise be considered. The Corporation’s TDRs include performing and nonperforming TDRs, which consist of originated loans that continue to accrue interest at the loan's original interest rate as the Corporation expects to collect the remaining principal and interest on the loan, and nonaccrual TDRs, which include originated loans that are in a nonaccrual status and are no longer accruing interest, as the Corporation does not expect to collect the full amount of principal and interest owed from the borrower on these loans. At the time of modification (except for loans on nonaccrual status), a TDR is reported as a nonperforming TDR until a six-month payment history of principal and interest payments, in accordance with the terms of the loan modification, is sustained, at which time the Corporation moves the loan to a performing status (performing TDR). If the Corporation does not expect to collect all principal and interest on the loan, the modified loan is classified as a nonaccrual TDR. All TDRs are accounted for as impaired loans and are included in the Corporation’s analysis of the allowance for loan losses. A TDR that has been renewed by a borrower who is no longer experiencing financial difficulty and which yields a market rate of interest at the time of a refinancing is no longer reported as a TDR.

Loans in the Corporation’s commercial loan portfolio (comprised of commercial, commercial real estate, real estate construction and land development loans) that meet the definition of a TDR generally consist of loans where the Corporation has allowed borrowers to defer scheduled principal payments and make interest-only payments for a specified period of time at the stated interest rate of the original loan agreement or reduced payments due to a moderate extension of the loan’s contractual term. If the Corporation does not expect to collect all principal and interest on the loan, the modified loan is classified as a nonaccrual TDR. If the Corporation does not expect to incur a loss on the loan based on its assessment of the borrowers’ expected cash flows, as the pre- and post-modification effective yields are approximately the same, the loan is classified as a nonperforming TDR until a six-month payment history is sustained, at which time the loan is classified as a performing TDR. Since no loss is expected to be incurred on these loans, no additional provision for loan losses has been recognized related to these loans, and these loans accrue interest at their contractual interest rate. These loans are individually evaluated for impairment and transferred to nonaccrual status if they become 90 days past due as to principal or interest payments or if it is probable that any remaining principal and interest payments due on the loan will not be collected in accordance with the modified terms of the loan.

Loans in the Corporation’s consumer loan portfolio (comprised of residential mortgage, consumer installment and home equity loans) that meet the definition of a performing or nonperforming TDR generally consist of residential mortgage loans that include a concession that reduces a borrower’s monthly payments by decreasing the interest rate charged on the loan for a specified period of time (generally 24 months) under a formal modification agreement. The Corporation recognizes an additional provision for loan losses related to impairment on these loans on an individual basis based on the present value of expected future cash flows discounted at the loan’s original effective interest rate. These loans continue to accrue interest at their effective interest rate, which consists of contractual interest under the terms of the modification agreement in addition to an adjustment for the accretion of computed impairment. These loans are moved to nonaccrual status if they become 90 days past due as to principal or interest payments, or sooner if conditions warrant.

Impaired Loans

Impaired Loans

A loan is defined to be impaired when it is probable that payment of principal and interest will not be paid in accordance with the original contractual terms of the loan agreement. Impaired loans include nonaccrual loans (including nonaccrual TDRs), performing and nonperforming TDRs and acquired loans that were not performing in accordance with original contractual terms. Impaired loans are accounted for at the lower of the present value of expected cash flows discounted at the loan's original effective interest rate or the estimated fair value of the collateral, if the loan is collateral dependent. When the present value of expected cash flows or the fair value of collateral of an impaired loan in the originated loan portfolio is less than the amount of unpaid principal outstanding on the loan, the principal balance of the loan is reduced to its carrying value through either an allocation of the allowance for loan losses or a partial charge-off of the loan balance.

Nonperforming Loans

Nonperforming Loans

Nonperforming loans are comprised of loans for which the accrual of interest has been discontinued (nonaccrual loans, including nonaccrual TDRs), accruing originated loans contractually past due 90 days or more as to interest or principal payments and nonperforming TDRs.

Acquired loans that were classified as nonperforming loans prior to being acquired and acquired loans that are not performing in accordance with contractual terms subsequent to acquisition are not classified as nonperforming loans subsequent to acquisition because the loans are recorded in pools at net realizable value based on the principal and interest the Corporation expects to collect on such loans.

Allowance for Loan Losses

Allowance for Loan Losses

The allowance for loan losses (allowance) is presented as a reserve against loans. The allowance represents management’s assessment of probable loan losses inherent in the Corporation’s loan portfolio.

Management’s evaluation of the adequacy of the allowance is based on a continuing review of the loan portfolio, actual loan loss experience, the underlying value of the collateral, risk characteristics of the loan portfolio, the level and composition of nonperforming loans, the financial condition of the borrowers, the balance of the loan portfolio, loan growth, economic conditions, employment levels in the Corporation’s local markets, and special factors affecting specific business sectors. The Corporation maintains formal policies and procedures to monitor and control credit risk. Management evaluates the allowance on a quarterly basis in an effort to ensure the level is appropriate to absorb probable losses inherent in the loan portfolio.

The allowance provides for probable losses that have been identified with specific customer relationships and for probable losses believed to be incurred in the remainder of the originated loan portfolio, but that have not been specifically identified. The Corporation utilizes its own loss experience to estimate inherent losses on loans. Internal risk ratings are assigned to each loan in the commercial loan portfolio (commercial, commercial real estate, real estate construction and land development loans) at the time of origination and are subject to subsequent periodic reviews by senior management. The Corporation performs a detailed credit quality review quarterly on all loans greater than $0.25 million that have deteriorated below certain levels of credit risk, and may allocate a specific portion of the allowance to such loans based upon this review. A portion of the allowance is allocated to the remaining loans by applying projected loss ratios, based on numerous factors. Projected loss ratios incorporate factors such as charge-off experience, trends with respect to adversely risk-rated loans in the commercial loan portfolio, trends with respect to past due and nonaccrual loans, changes in economic conditions and trends, changes in the value of underlying collateral and other credit risk factors. This evaluation involves a high degree of uncertainty.

In determining the allowance and the related provision for loan losses, the Corporation considers four principal elements: (i) valuation allowances based upon probable losses identified during the review of impaired loans in the commercial loan portfolio, (ii) reserves established for adversely-rated loans in the commercial loan portfolio and nonaccrual residential mortgage, consumer installment and home equity loans based on loan loss experience of other adversely-rated loans, (iii) reserves, by loan classes, on all other loans based principally on a five-year historical loan loss experience, with higher weighting placed on the most recent years, loan loss trends giving consideration to estimated loss emergence periods and (iv) an unallocated allowance based on the imprecision in the overall allowance methodology for loans collectively evaluated for impairment.

Although the Corporation allocates portions of the allowance to specific loans and loan types, the entire allowance attributable to originated loans is available for any loan losses that occur in the originated portfolio. Loans that are deemed not collectible are charged off and reduce the allowance. The provision for loan losses and recoveries on loans previously charged off increase the allowance. Collection efforts may continue and recoveries may occur after a loan is charged off.

Acquired loans are aggregated into pools based upon common risk characteristics. An allowance may be recorded related to an acquired loan pool if it experiences a decrease in expected cash flows, as compared to those projected at the acquisition date. On a quarterly basis, the expected future cash flow of each pool is estimated based on various factors, including changes in property values of collateral dependent loans, default rates, loss severities and prepayment speeds. Decreases in estimates of expected cash flows within a pool generally result in a charge to the provision for loan losses and a corresponding increase in the allowance allocated to acquired loans for the particular pool. Increases in estimates of expected cash flows within a pool generally result in a reduction in the allowance allocated to acquired loans for the particular pool, if applicable, and then an adjustment to the accretable yield for the pool, which will increase amounts recognized in interest income in subsequent periods.

Various regulatory agencies, as an integral part of their examination process, periodically review the allowance. Such agencies may require additions to the allowance, based on their judgment, reflecting information available to them at the time of their examinations.

Fair Value Measurements

Fair Value Measurements

Fair value for assets and liabilities measured at fair value on a recurring or nonrecurring basis refers to the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants in the market in which the reporting entity transacts such sales or transfers based on the assumptions market participants would use when pricing an asset or liability. Assumptions are developed based on prioritizing information within a fair value hierarchy that gives the highest priority to quoted prices in active markets and the lowest priority to unobservable data, such as the reporting entity’s own data.

The Corporation may choose to measure eligible items at fair value at specified election dates. Unrealized gains and losses on items for which the fair value measurement option has been elected are reported in earnings at each subsequent reporting date. The fair value option (i) may be applied instrument by instrument, with certain exceptions, allowing the Corporation to record identical financial assets and liabilities at fair value or by another measurement basis permitted under GAAP, (ii) is irrevocable (unless a new election date occurs) and (iii) is applied only to entire instruments and not to portions of instruments. At March 31, 2015, December 31, 2014 and March 31, 2014, the Corporation had elected the fair value option on all of its residential mortgage loans held-for-sale. The Corporation has not elected the fair value option for any other financial assets or liabilities.

Share-Based Compensation

Share-Based Compensation

The Corporation grants stock options, stock awards, restricted stock performance units and restricted stock service-based units to certain executive and senior management employees. The Corporation accounts for share-based compensation expense using the modified-prospective transition method. Under that method, compensation expense is recognized for stock options based on the estimated grant date fair value as computed using the Black-Scholes option pricing model and the probability of issuance. The Corporation accounts for stock awards based on the closing stock price of the Corporation's common stock on the date of the award. The fair values of both stock options and stock awards are recognized as compensation expense on a straight-line basis over the requisite service period. The Corporation accounts for restricted stock performance units based on the closing stock price of the Corporation's common stock on the date of grant, discounted by the present value of estimated future dividends to be declared over the requisite performance or service period. The fair value of restricted stock performance units is recognized as compensation expense over the expected requisite performance period, or requisite service period for awards with multiple performance and service conditions. The Corporation accounts for restricted stock service-based units based on the closing stock price of the Corporation's common stock on the date of grant, as these awards accrue dividend equivalents equal to the amount of any cash dividends that would have been payable to a shareholder owning the number of shares of the Corporation's common stock represented by the restricted stock service-based units. The fair value of the restricted stock service-based units is recognized as compensation expense over the requisite service period.

Cash flows realized from the tax benefits of exercised stock option awards that result from actual tax deductions that are in excess of the recorded tax benefits related to the compensation expense recognized for those options (excess tax benefits) are classified as financing activities on the consolidated statements of cash flows.

Income and Other Taxes

Income and Other Taxes

The Corporation is subject to the income and other tax laws of the United States, the State of Michigan and other states where nexus has been created. These laws are complex and are subject to different interpretations by the taxpayer and the various taxing authorities. In determining the provision for income and other taxes, management must make judgments and estimates about the application of these inherently complex laws, related regulations and case law. In the process of preparing the Corporation’s tax returns, management attempts to make reasonable interpretations of enacted tax laws. These interpretations are subject to challenge by the tax authorities upon audit or to reinterpretation based on management’s ongoing assessment of facts and evolving case law.

On a quarterly basis, management assesses the reasonableness of its effective federal tax rate based upon its estimate of taxable income and the applicable taxes expected for the full year. Deferred tax assets and liabilities are reassessed on a quarterly basis, including the need for a valuation allowance for deferred tax assets.

Uncertain income tax positions are evaluated to determine whether it is more-likely-than-not that a tax position will be sustained upon examination based on the technical merits of the tax position. If a tax position is more-likely-than-not to be sustained, a tax benefit is recognized for the amount that is greater than 50% likely to be realized. Reserves for contingent income tax liabilities attributable to unrecognized tax benefits associated with uncertain tax positions are reviewed quarterly for adequacy based upon developments in tax law and the status of audits or examinations. The Corporation had no contingent income tax liabilities recorded at March 31, 2015, December 31, 2014 or March 31, 2014. The tax periods open to examination by the Internal Revenue Service include the calendar years ended December 31, 2014, 2013, 2012 and 2011.

Investments in Qualified Affordable Housing Projects [Policy Text Block]

Investments in Qualified Affordable Housing Projects

The Corporation invests in qualified affordable housing projects solely for the purpose of obtaining tax credits and other tax benefits. Accordingly, the Corporation believes that amortizing its investments in qualified affordable housing projects as a component of income tax expense rather than as a component of operating expenses better reflects the nature and intent of these investments. The Corporation recognized additional income tax expense attributable to the amortization of investments in qualified affordable housing projects of $0.1 million during each of the three months ended March 31, 2015 and 2014. The Corporation's remaining investment in qualified affordable housing projects totaled $4.8 million at March 31, 2015, $4.9 million at December 31, 2014 and$3.2 million atMarch 31, 2014.

Shareholders' Equity

Shareholders’ Equity

Common Stock Repurchase Programs

From time to time, the board of directors of the Corporation approves common stock repurchase programs allowing management to repurchase shares of the Corporation’s common stock in the open market. The repurchased shares are available for later reissuance in connection with potential future stock dividends, the Corporation’s dividend reinvestment plan, employee benefit plans and other general corporate purposes. Under these programs, the timing and actual number of shares subject to repurchase are at the discretion of management and are contingent on a number of factors, including the projected parent company cash flow requirements and the Corporation’s market price per share.

In January 2008, the board of directors of the Corporation authorized the repurchase of up to 500,000 shares of the Corporation’s common stock under a stock repurchase program. In November 2011, the board of directors of the Corporation reaffirmed the stock buy-back authorization with the qualification that the shares may only be repurchased if the share price is below the tangible book value per share of the Corporation’s common stock at the time of the repurchase. Since the January 2008 authorization, no shares have been repurchased. At March 31, 2015, there were 500,000 remaining shares available for repurchase under the Corporation’s stock repurchase program.

Underwritten Public Offerings of Common Stock

On June 24, 2014, the Corporation issued and sold 2,500,000 shares of common stock at a public offering price of $28.00 per share. An additional 375,000 shares were issued and sold on June 30, 2014 upon the exercise in full of the underwriters' over-allotment option. The net proceeds from the issuance and sale of the common stock of this $80.5 million offering, after deducting the underwriting discount and issuance-related expenses, totaled $76.2 million.

On September 18, 2013, the Corporation issued and sold 2,213,750 shares of common stock, including 288,750 shares of common stock that were issued and sold upon the exercise in full of the underwriters' over-allotment option, at a public offering price of $26.00 per share. The net proceeds from the issuance and sale of the common stock, after deducting the underwriting discount and issuance-related expenses, totaled $53.9 million.

Shelf Registration

On June 12, 2014, the Corporation filed an automatic shelf registration statement on Form S-3 with the Securities and Exchange Commission (SEC) for an indeterminate amount of securities, which became immediately effective. The shelf registration statement provides the Corporation with the ability to raise capital, subject to SEC rules and limitations, if the board of directors of the Corporation decides to do so.

Preferred Stock

On April 20, 2009, the shareholders of the Corporation authorized the board of directors of the Corporation to issue up to 200,000 shares of preferred stock in connection with either an acquisition by the Corporation of an entity that has shares of preferred stock issued and outstanding pursuant to any program established by the United States government or participation by the Corporation in any program established by the United States government. On April 20, 2015, the shareholders of the Corporation approved an amendment to the restated articles of incorporation which eliminates and replaces the previous class of 200,000 shares of preferred stock with a new class of 2,000,000 shares of preferred stock. At March 31, 2015, no shares of preferred stock were issued and outstanding.

Common Stock

On April 20, 2015, the shareholders of the Corporation approved an amendment to the restated articles of incorporation to increase the number of authorized shares of common stock from 45,000,000 to 60,000,000.

Legal Matters

Legal Matters

The Corporation and Chemical Bank are subject to certain legal actions arising in the ordinary course of business. In the opinion of management, after consultation with legal counsel, the ultimate disposition of these matters is not expected to have a material adverse effect on the consolidated financial condition or results of operations of the Corporation.

Adopted Accounting Pronouncements

Adopted Accounting Pronouncements

In-Substance Foreclosures

In January 2014, the FASB issued ASU 2014-04, Receivables—Troubled Debt Restructurings by Creditors (Subtopic 310-40): Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure, a consensus of the FASB Emerging Issues Task Force (ASU 2014-04). ASU 2014-04 clarifies that an in-substance foreclosure occurs, and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either (i) the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure or (ii) the borrower conveying all interest in the residential real estate property to the creditor to satisfy the loan through completion of a deed in lieu of foreclosure or similar legal agreement. ASU 2014-04 also requires disclosure of both the amount of foreclosed residential real estate property held by the creditor and the recorded investment in loans collateralized by residential real estate property that are in the process of foreclosure. ASU 2014-04 is effective for public companies for interim and annual periods beginning after December 15, 2014, with early adoption permitted. Once adopted, an entity can elect either (i) a modified retrospective transition method or (ii) a prospective transition method. The modified retrospective transition method is applied by means of a cumulative-effect adjustment to residential mortgage loans and foreclosed residential real estate properties existing as of the beginning of the period for which the amendments of ASU 2014-04 are effective, with real estate reclassified to loans measured at the carrying value of the real estate at the date of adoption and loans reclassified to real estate measured at the lower of net carrying value of the loan or the fair value of the real estate less costs to sell at the date of adoption. The prospective transition method is applied by means of applying the amendments of ASU 2014-04 to all instances of receiving physical possession of residential real estate properties that occur after the date of adoption. The adoption of ASU 2014-04 on January 1, 2015 did not have a material impact on the Corporation's consolidated financial condition or results of operations.

Share-Based Compensation

In June 2014, the FASB issued ASU 2014-12, Compensation—Stock Compensation (Topic 718): Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period, a consensus of the FASB Emerging Issues Task Force (ASU 2014-12). ASU 2014-12 requires that a performance target that affects vesting of share-based payment awards and that could be achieved after the requisite service period be treated as a performance condition. Compensation cost should be recognized in the period in which it becomes probable that the performance target will be achieved and should represent the compensation cost attributable to the periods for which the requisite service has already been rendered. If the performance target becomes probable of being achieved before the end of the requisite service period, the remaining unrecognized compensation cost should be recognized prospectively over the remaining requisite service period. The total amount of compensation cost recognized during and after the requisite service period should reflect the number of awards that are expected to vest and should be adjusted to reflect those awards that ultimately vest. The requisite service period ends when the employee can cease rendering service and still be eligible to vest in the award if the performance target is achieved. ASU 2014-12 is effective for all entities for interim and annual periods beginning after December 15, 2015, with early adoption permitted. An entity may apply the amendments in ASU 2014-12 either (i) prospectively to all awards granted or modified after the effective date or (ii) retrospectively to all awards with performance targets that are outstanding as of the beginning of the earliest annual period presented in the financial statements and to all new or modified awards thereafter. The Corporation's early adoption of ASU 2014-12 on January 1, 2015 did not have a material impact on the Corporation's consolidated financial condition or results of operations.

Government-Guaranteed Mortgage Loans

In August 2014, the FASB issued ASU 2014-14, Receivables-Troubled Debt Restructurings by Creditors (Subtopic 310-40): Classification of Certain Government Guaranteed Mortgage Loans upon Foreclosure, a consensus of the FASB Emerging Issues Task Force (ASU 2014-14). ASU 2014-14 provides clarifying guidance related to how creditors classify government-guaranteed loans upon foreclosure. Upon foreclosure of a government-guaranteed mortgage loan, the loan should be derecognized and a separate other receivable should be recognized if the following conditions are met: (i) the loan has a government guarantee that is not separable from the loan before foreclosure; (ii) at the time of foreclosure, the creditor has the intent to convey the real estate property to the guarantor and make a claim on the guarantee, and the creditor has the ability to recover under that claim; and (iii) at the time of foreclosure, any amount of the claim that is determined on the basis of the fair value of the real estate is fixed. The separate other receivable should be measured based on the amount of the loan balance (principal and interest) expected to be recovered from the guarantor at the time of foreclosure. ASU 2014-14 is effective for public companies for interim and annual periods beginning after December 15, 2014. An entity should adopt using either the modified retrospective method or the prospective transition method. An entity must apply the same method elected under ASU 2014-04. Early adoption is permitted if the entity has already adopted ASU 2014-04. The adoption of ASU 2014-14 on January 1, 2015 did not have a material impact on the Corporation's consolidated financial condition or results of operations.

Pending Accounting Pronouncements

Pending Accounting Pronouncements

There are no recent accounting pronouncements that have been issued by the FASB that would have a material impact on the financial statements of the Corporation.

XML

Investment Securities (Summary of Amortized Cost and Fair Value of Available-For-Sale Investment Securities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Available-for-sale Securities
Investment securities available-for-sale, Amortized Cost	$ 677,940	$ 749,187	$ 659,183
Investment securities available-for-sale, Unrealized Gains	3,646	3,003	3,794
Investment securities available-for-sale, Unrealized Losses	942	3,326	5,159
Available-for-sale Securities, Total	680,644	748,864	657,818
US Treasury Securities [Member]
Available-for-sale Securities
Investment securities available-for-sale, Amortized Cost	8,271	8,272
Investment securities available-for-sale, Unrealized Gains	31	0
Investment securities available-for-sale, Unrealized Losses	0	13
Available-for-sale Securities, Total	8,302	8,259
Government sponsored agencies [Member]
Available-for-sale Securities
Investment securities available-for-sale, Amortized Cost	249,642	263,658	91,613
Investment securities available-for-sale, Unrealized Gains	889	356	295
Investment securities available-for-sale, Unrealized Losses	101	511	298
Available-for-sale Securities, Total	250,430	263,503	91,610
State and political subdivisions [Member]
Available-for-sale Securities
Investment securities available-for-sale, Amortized Cost	31,701	45,157	42,369
Investment securities available-for-sale, Unrealized Gains	624	1,087	1,408
Investment securities available-for-sale, Unrealized Losses	3	17	0
Available-for-sale Securities, Total	32,322	46,227	43,777
Residential mortgage-backed securities [Member]
Available-for-sale Securities
Investment securities available-for-sale, Amortized Cost	218,299	240,465	291,187
Investment securities available-for-sale, Unrealized Gains	1,358	885	1,023
Investment securities available-for-sale, Unrealized Losses	56	1,543	3,472
Available-for-sale Securities, Total	219,601	239,807	288,738
Collateralized Mortgage Obligations [Member]
Available-for-sale Securities
Investment securities available-for-sale, Amortized Cost	133,713	145,316	167,622
Investment securities available-for-sale, Unrealized Gains	305	261	393
Investment securities available-for-sale, Unrealized Losses	718	1,194	1,296
Available-for-sale Securities, Total	133,300	144,383	166,719
Corporate bonds [Member]
Available-for-sale Securities
Investment securities available-for-sale, Amortized Cost	34,925	44,930	65,003
Investment securities available-for-sale, Unrealized Gains	136	213	505
Investment securities available-for-sale, Unrealized Losses	64	48	93
Available-for-sale Securities, Total	34,997	45,095	65,415
Preferred stock [Member]
Available-for-sale Securities
Investment securities available-for-sale, Amortized Cost	1,389	1,389	1,389
Investment securities available-for-sale, Unrealized Gains	303	201	170
Investment securities available-for-sale, Unrealized Losses	0	0	0
Available-for-sale Securities, Total	$ 1,692	$ 1,590	$ 1,559

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Investment Securities (Tables)

3 Months Ended

Mar. 31, 2015

Investments, Debt and Equity Securities [Abstract]

Available-for-sale Securities

The following is a summary of the amortized cost and fair value of investment securities available-for-sale and investment securities held-to-maturity at March 31, 2015, December 31, 2014 and March 31, 2014:

	Investment Securities Available-for-Sale
	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value
	(In thousands)
March 31, 2015
U.S. Treasury securities	$	8,271	$	31	$	—	$	8,302
Government sponsored agencies	249,642		889		101		250,430
State and political subdivisions	31,701		624		3		32,322
Residential mortgage-backed securities	218,299		1,358		56		219,601
Collateralized mortgage obligations	133,713		305		718		133,300
Corporate bonds	34,925		136		64		34,997
Preferred stock	1,389		303		—		1,692
Total	$	677,940	$	3,646	$	942	$	680,644
December 31, 2014
U.S. Treasury securities	$	8,272	$	—	$	13	$	8,259
Government sponsored agencies	263,658		356		511		263,503
State and political subdivisions	45,157		1,087		17		46,227
Residential mortgage-backed securities	240,465		885		1,543		239,807
Collateralized mortgage obligations	145,316		261		1,194		144,383
Corporate bonds	44,930		213		48		45,095
Preferred stock	1,389		201		—		1,590
Total	$	749,187	$	3,003	$	3,326	$	748,864
March 31, 2014
Government sponsored agencies	$	91,613	$	295	$	298	$	91,610
State and political subdivisions	42,369		1,408		—		43,777
Residential mortgage-backed securities	291,187		1,023		3,472		288,738
Collateralized mortgage obligations	167,622		393		1,296		166,719
Corporate bonds	65,003		505		93		65,415
Preferred stock	1,389		170		—		1,559
Total	$	659,183	$	3,794	$	5,159	$	657,818

Held-to-maturity Securities

	Investment Securities Held-to-Maturity
	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value
	(In thousands)
March 31, 2015
State and political subdivisions	$	370,950	$	6,852	$	4,926	$	372,876
Trust preferred securities	10,500		—		3,200		7,300
Total	$	381,450	$	6,852	$	8,126	$	380,176
December 31, 2014
State and political subdivisions	$	305,913	$	7,294	$	4,557	$	308,650
Trust preferred securities	10,500		—		3,410		7,090
Total	$	316,413	$	7,294	$	7,967	$	315,740
March 31, 2014
State and political subdivisions	$	267,599	$	5,331	$	6,983	$	265,947
Trust preferred securities	10,500		—		4,040		6,460
Total	$	278,099	$	5,331	$	11,023	$	272,407

Amortized cost and fair value of debt securities by contractual maturity

The following is a summary of the amortized cost and fair value of investment securities at March 31, 2015, by maturity, for both available-for-sale and held-to-maturity investment securities. The maturities of residential mortgage-backed securities and collateralized mortgage obligations are based on scheduled principal payments. The maturities of all other debt securities are based on final contractual maturity.

	March 31, 2015
	Amortized Cost		Fair Value
	(In thousands)
Investment Securities Available-for-Sale:
Due in one year or less	$	180,558	$	180,869
Due after one year through five years	442,088		443,752
Due after five years through ten years	50,902		51,302
Due after ten years	3,003		3,029
Preferred stock	1,389		1,692
Total	$	677,940	$	680,644
Investment Securities Held-to-Maturity:
Due in one year or less	$	35,293	$	35,365
Due after one year through five years	171,557		172,699
Due after five years through ten years	120,799		122,512
Due after ten years	53,801		49,600
Total	$	381,450	$	380,176

Summary of continuous unrealized loss position of securities

The following schedule summarizes information for both available-for-sale and held-to-maturity investment securities with gross unrealized losses at March 31, 2015, December 31, 2014 and March 31, 2014, aggregated by category and length of time that individual securities have been in a continuous unrealized loss position.

	Less Than 12 Months				12 Months or More				Total
	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
	(In thousands)
March 31, 2015
U.S. Treasury securities	$	—	$	—	$	—	$	—	$	—	$	—
Government sponsored agencies	27,889		64		18,896		37		46,785		101
State and political subdivisions	156,010		1,989		49,839		2,940		205,849		4,929
Residential mortgage-backed securities	82,303		28		3,847		28		86,150		56
Collateralized mortgage obligations	22,694		22		41,061		696		63,755		718
Corporate bonds	4,989		11		14,946		53		19,935		64
Trust preferred securities	—		—		7,300		3,200		7,300		3,200
Total	$	293,885	$	2,114	$	135,889	$	6,954	$	429,774	$	9,068
December 31, 2014
U.S. Treasury securities	$	8,259	$	13	$	—	$	—	$	8,259	$	13
Government sponsored agencies	166,963		406		31,927		105		198,890		511
State and political subdivisions	62,310		3,348		36,847		1,226		99,157		4,574
Residential mortgage-backed securities	17,276		52		180,194		1,491		197,470		1,543
Collateralized mortgage obligations	63,077		179		31,620		1,015		94,697		1,194
Corporate bonds	—		—		14,952		48		14,952		48
Trust preferred securities	—		—		7,090		3,410		7,090		3,410
Total	$	317,885	$	3,998	$	302,630	$	7,295	$	620,515	$	11,293
March 31, 2014
Government sponsored agencies	$	45,396	$	110	$	15,204	$	188	$	60,600	$	298
State and political subdivisions	79,787		4,942		56,180		2,041		135,967		6,983
Residential mortgage-backed securities	247,397		3,472		—		—		247,397		3,472
Collateralized mortgage obligations	76,900		885		12,833		411		89,733		1,296
Corporate bonds	—		—		14,907		93		14,907		93
Trust preferred securities	—		—		6,460		4,040		6,460		4,040
Total	$	449,480	$	9,409	$	105,584	$	6,773	$	555,064	$	16,182

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Share-Based Compensation (Restricted Stock Unit Activity) (Details) (Restricted Stock Units (RSUs) [Member], USD $)	3 Months Ended
	Mar. 31, 2015
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Number of Shares [Roll Forward]
Beginning balance, Number of shares	204,319
Granted, Number of shares	76,286
Converted into shares of common stock, Number of shares	(66,769)
Forfeited/expired, Number of shares	(405)
Ending balance, Number of shares	213,431
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Weighted Average Grant Date Fair Value [Abstract]
Beginning balance, Weighted average grant date fair value	$ 24.14
Granted, Weighted Average grant date fair value	$ 28.15
Converted into shares of common stock, Weighted average grant date fair value	$ 22.32
Forfeited/expired, Weighted average grant date fair value	$ 25.17
Ending balance, Weighted average grant date fair value	$ 26.14

XML

Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance at Dec. 31, 2013	$ 696,500	$ 29,790	$ 488,177	$ 199,053	$ (20,520)
Changes in Stockholders' Equity [Roll Forward]
Comprehensive income	15,032			13,813	1,219
Cash dividends declared per share: $0.24 and $0.23 per share for the three months ended March 31, 2015 and March 31, 2014, respectively	(6,881)			(6,881)
Stock issued - stock options	557	27	530
Shares issued – directors’ stock plans	310	12	298
Shares issued – restricted stock units	(477)	36	(513)
Share-based compensation	554	1	553
Ending Balance at Mar. 31, 2014	705,595	29,866	489,045	205,985	(19,301)
Beginning Balance at Dec. 31, 2014	797,133	32,774	565,166	231,646	(32,453)
Changes in Stockholders' Equity [Roll Forward]
Comprehensive income	20,509			17,835	2,674
Cash dividends declared per share: $0.24 and $0.23 per share for the three months ended March 31, 2015 and March 31, 2014, respectively	(7,899)			(7,899)
Stock issued - stock options	131	13	118
Shares issued – directors’ stock plans	316	11	305
Shares issued – restricted stock units	(444)	48	(492)
Share-based compensation	755	1	754
Ending Balance at Mar. 31, 2015	$ 810,501	$ 32,847	$ 565,851	$ 241,582	$ (29,779)

XML

Consolidated Statements of Financial Position (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Held-to-maturity, fair value	$ 380,176	$ 315,740	$ 272,407
Accumulated depreciation of premises and equipment	$ 111,270	$ 108,826	$ 102,163
Preferred stock, no par value
Preferred stock, shares authorized	200,000	200,000	200,000
Preferred stock, shares issued	0	0	0
Common stock, par value	$ 1	$ 1	$ 1
Common stock, shares authorized	45,000,000	45,000,000	45,000,000
Common stock, shares issued	32,847,063	32,774,420	29,865,841
Common stock, shares outstanding	32,847,063	32,774,420	29,865,841

XML

Fair Value Measurements

3 Months Ended

Mar. 31, 2015

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

Fair value, as defined by GAAP, is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. A fair value measurement assumes that the transaction to sell the asset or transfer the liability occurs in the principal market for the asset or liability or, in the absence of a principal market, the most advantageous market for the asset or liability. The price in the principal (or most advantageous) market used to measure the fair value of the asset or liability is not adjusted for transaction costs. An orderly transaction is a transaction that assumes exposure to the market for a period prior to the measurement date to allow for market activities that are usual and customary for transactions involving such assets and liabilities; it is not a forced transaction. Market participants are buyers and sellers in the principal market that are (i) independent, (ii) knowledgeable, (iii) able to transact and (iv) willing to transact.

The Corporation utilizes fair value measurements to record fair value adjustments to certain assets and to determine fair value disclosures. Investment securities — available-for-sale and loans held-for-sale are recorded at fair value on a recurring basis. Additionally, the Corporation may be required to record other assets, such as impaired loans, goodwill, other intangible assets, other real estate and repossessed assets, at fair value on a nonrecurring basis. These nonrecurring fair value adjustments typically involve the application of lower of cost or market accounting or write-downs of individual assets.

The Corporation determines the fair value of its financial instruments based on a three-level hierarchy established by GAAP. The classification and disclosure of assets and liabilities within the hierarchy is based on whether the inputs to the valuation methodology used for measurement are observable or unobservable. Observable inputs reflect market-derived or market-based information obtained from independent sources, while unobservable inputs reflect management’s estimates about market data. The three levels of inputs that may be used to measure fair value within the GAAP hierarchy are as follows:

Level 1 Valuation is based upon quoted prices for identical instruments traded in active markets. Level 1 valuations for the Corporation would include U.S. Treasury securities that are traded by dealers or brokers in active over-the-counter markets. Valuations are obtained from a third-party pricing service for these investment securities.

Level 2 Valuation is based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant assumptions are observable in the market. Level 2 valuations for the Corporation include government sponsored agency securities, including securities issued by the Federal Home Loan Bank, Federal Home Loan Mortgage Corporation, Federal National Mortgage Association, Federal Farm Credit Bank, Student Loan Marketing Corporation and the Small Business Administration, securities issued by certain state and political subdivisions, residential mortgage-backed securities, collateralized mortgage obligations, corporate bonds and preferred stock. Valuations are obtained from a third-party pricing service for these investment securities.

Level 3 Valuation is generated from model-based techniques that use at least one significant assumption not observable in the market. These unobservable assumptions reflect estimates of assumptions that market participants would use in pricing the asset or liability. Valuation techniques include use of option pricing models, discounted cash flow models, yield curves and similar techniques. The determination of fair value requires management judgment or estimation and generally is corroborated by external data, which includes third-party pricing services. Level 3 valuations for the Corporation include securities issued by certain state and political subdivisions, trust preferred investment securities, impaired loans, goodwill, core deposit intangible assets, MSRs and other real estate and repossessed assets.

A description of the valuation methodologies used for instruments measured at fair value, as well as the general classification of such instruments pursuant to the valuation hierarchy, is set forth below. These valuation methodologies were applied to all of the Corporation’s financial assets and financial liabilities carried at fair value and all financial instruments disclosed at fair value. In general, fair value is based upon quoted market prices, where available. If quoted market prices are not available, fair value is based upon third-party pricing services when available. Fair value may also be based on internally developed models that primarily use, as inputs, observable market-based parameters. Valuation adjustments may be required to record financial instruments at fair value. Any such valuation adjustments are applied consistently over time. The Corporation’s valuation methodologies may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values.

While management believes the Corporation’s valuation methodologies are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different estimate of fair value at the reporting date. Furthermore, the fair value amounts may change significantly after the date of the statement of financial position from the amounts reported in the consolidated financial statements and related notes.

Assets and Liabilities Recorded at Fair Value on a Recurring Basis

Investment securities — available-for-sale are recorded at fair value on a recurring basis. Fair value measurement is based upon quoted prices, if available. If quoted prices are not available, fair values are generally measured using independent pricing models or other model-based valuation techniques that include market inputs, such as benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers, reference data and industry and economic events.

The Corporation elected the fair value option for all residential mortgage loans held-for-sale originated on or after July 1, 2012. Accordingly, loans held-for-sale are recorded at fair value on a recurring basis. The fair values of loans held-for-sale are based on the market price for similar loans sold in the secondary market, and therefore, are classified as Level 2 valuations.

Disclosure of Recurring Basis Fair Value Measurements

For assets measured at fair value on a recurring basis, quantitative disclosures about the fair value measurements for each major category of assets were as follows:

	Fair Value Measurements – Recurring Basis
	Quoted Prices In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(In thousands)
March 31, 2015
Investment securities – available-for-sale:
U.S. Treasury securities	$	8,302	$	—	$	—	$	8,302
Government sponsored agencies	—		250,430		—		250,430
State and political subdivisions	—		32,322		—		32,322
Residential mortgage-backed securities	—		219,601		—		219,601
Collateralized mortgage obligations	—		133,300		—		133,300
Corporate bonds	—		34,997		—		34,997
Preferred stock	—		1,692		—		1,692
Total investment securities – available-for-sale	8,302		672,342		—		680,644
Loans held-for-sale	—		9,675		—		9,675
Total assets measured at fair value on a recurring basis	$	8,302	$	682,017	$	—	$	690,319
December 31, 2014
Investment securities – available-for-sale:
U.S. Treasury securities	$	8,259	$	—	$	—	$	8,259
Government sponsored agencies	—		263,503		—		263,503
State and political subdivisions	—		46,227		—		46,227
Residential mortgage-backed securities	—		239,807		—		239,807
Collateralized mortgage obligations	—		144,383		—		144,383
Corporate bonds	—		45,095		—		45,095
Preferred stock	—		1,590		—		1,590
Total investment securities – available-for-sale	8,259		740,605		—		748,864
Loans held-for-sale	—		9,128		—		9,128
Total assets measured at fair value on a recurring basis	$	8,259	$	749,733	$	—	$	757,992
March 31, 2014
Investment securities – available-for-sale:
Government sponsored agencies	$	—	$	91,610	$	—	$	91,610
State and political subdivisions	—		43,777		—		43,777
Residential mortgage-backed securities	—		288,738		—		288,738
Collateralized mortgage obligations	—		166,719		—		166,719
Corporate bonds	—		65,415		—		65,415
Preferred stock	—		1,559		—		1,559
Total investment securities – available-for-sale	—		657,818		—		657,818
Loans held-for-sale	—		3,814		—		3,814
Total assets measured at fair value on a recurring basis	$	—	$	661,632	$	—	$	661,632

There were no liabilities recorded at fair value on a recurring basis at March 31, 2015, December 31, 2014 or March 31, 2014.

Assets and Liabilities Recorded at Fair Value on a Nonrecurring Basis

The Corporation does not record loans held for investment at fair value on a recurring basis. However, from time to time, a loan is considered impaired and an allocation of the allowance (valuation allowance) may be established or a portion of the loan is charged off. Loans for which it is probable that payment of interest and principal will not be made in accordance with the contractual terms of the loan agreement are considered impaired. The fair value of impaired loans is estimated using one of several methods, including the loan’s observable market price, the fair value of the collateral or the present value of the expected future cash flows discounted at the loan’s effective interest rate. Those impaired loans not requiring a valuation allowance represent loans for which the fair value of the expected repayments or collateral exceed the remaining carrying amount of such loans. Impaired loans where a valuation allowance is established or a portion of the loan is charged off based on the fair value of collateral are subject to nonrecurring fair value measurement and require classification in the fair value hierarchy. The Corporation records impaired loans as Level 3 valuations as there is generally no observable market price or independent appraised value, or management determines the fair value of the collateral is further impaired below the appraised value. When management determines the fair value of the collateral is further impaired below appraised value, discount factors ranging between 70% and 80% of the appraised value are used depending on the nature of the collateral and the age of the most recent appraisal.

Goodwill is subject to impairment testing on an annual basis. The assessment of goodwill for impairment requires a significant degree of judgment. In the event the assessment indicates that it is more-likely-than-not that the fair value is less than the carrying value, the asset is considered impaired and recorded at fair value. Goodwill that is impaired and subject to nonrecurring fair value measurements is a Level 3 valuation. At March 31, 2015, December 31, 2014 and March 31, 2014, no goodwill was impaired, and therefore, goodwill was not recorded at fair value on a nonrecurring basis.

Other intangible assets consist of core deposit intangible assets and MSRs. These items are both recorded at fair value when initially recorded. Subsequently, core deposit intangible assets are amortized primarily on an accelerated basis over periods ranging from ten to fifteen years and are subject to impairment testing whenever events or changes in circumstances indicate that the carrying amount exceeds the fair value of the asset. If core deposit intangible asset impairment is identified, the Corporation classifies impaired core deposit intangible assets subject to nonrecurring fair value measurements as Level 3 valuations. At March 31, 2015, December 31, 2014 and March 31, 2014, there was no impairment identified for core deposit intangible assets. The fair value of MSRs is initially estimated using a model that calculates the net present value of estimated future cash flows using various assumptions, including prepayment speeds, the discount rate and servicing costs. If the valuation model reflects a value less than the carrying value, MSRs are adjusted to fair value, as determined by the model, through a valuation allowance. The Corporation classifies MSRs subject to nonrecurring fair value measurements as Level 3 valuations. At March 31, 2015 and December 31, 2014, the Corporation recognized a valuation allowance of $0.2 million related to impairment within certain pools attributable to the Corporation's servicing portfolio that was acquired in the Northwestern transaction. At March 31, 2014, there was no impairment identified for MSRs and, therefore, no other intangible assets were recorded at fair value on a nonrecurring basis at that date.

The carrying amounts for other real estate (ORE) and repossessed assets (RA) are reported in the consolidated statements of financial position under “Interest receivable and other assets.” ORE and RA include real estate and other types of assets repossessed by the Corporation. ORE and RA are recorded at the lower of cost or fair value upon the transfer of a loan to ORE or RA and, subsequently, ORE and RA continue to be measured and carried at the lower of cost or fair value. Fair value is based upon independent market prices, appraised values of the property or management’s estimation of the value of the property. The Corporation records ORE and RA as Level 3 valuations as management generally determines that the fair value of the property is impaired below the appraised value. When management determines the fair value of the property is further impaired below appraised value, discount factors ranging between 70% and 75% of the appraised value are used depending on the nature of the property and the age of the most recent appraisal.

Disclosure of Nonrecurring Basis Fair Value Measurements

For assets measured at fair value on a nonrecurring basis, quantitative disclosures about fair value measurements for each major category of assets were as follows:

	Fair Value Measurements – Nonrecurring Basis
	Quoted Prices In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(In thousands)
March 31, 2015
Impaired originated loans	$	—	$	—	$	23,730	$	23,730
Other real estate/repossessed assets	—		—		14,744		14,744
Mortgage servicing rights	—		—		8,115		8,115
Total	$	—	$	—	$	46,589	$	46,589
December 31, 2014
Impaired originated loans	$	—	$	—	$	21,323	$	21,323
Other real estate/repossessed assets	—		—		14,205		14,205
Mortgage servicing rights	—		—		8,691		8,691
Total	$	—	$	—	$	44,219	$	44,219
March 31, 2014
Impaired originated loans	$	—	$	—	$	29,461	$	29,461
Other real estate/repossessed assets	—		—		10,056		10,056
Total	$	—	$	—	$	39,517	$	39,517

There were no liabilities recorded at fair value on a nonrecurring basis at March 31, 2015, December 31, 2014 and March 31, 2014.

Disclosures about Fair Value of Financial Instruments

GAAP requires disclosures about the estimated fair value of the Corporation's financial instruments, including those financial assets and liabilities that are not measured and reported at fair value on a recurring or nonrecurring basis. However, the method of estimating fair value for certain financial instruments, such as loans, that are not required to be measured on a recurring or nonrecurring basis, as prescribed by ASC 820, Fair Value Measurements and Disclosures, does not incorporate the exit-price concept of fair value. The Corporation utilized the fair value hierarchy in computing the fair values of its financial instruments. In cases where quoted market prices were not available, the Corporation employed present value methods using unobservable inputs requiring management's judgment to estimate the fair values of its financial instruments, which are considered Level 3 valuations. These Level 3 valuations are affected by the assumptions made and, accordingly, do not necessarily indicate amounts that could be realized in a current market exchange. It is also the Corporation's general practice and intent to hold the majority of its financial instruments until maturity and, therefore, the Corporation does not expect to realize the estimated amounts disclosed.

The methodologies for estimating the fair value of financial assets and financial liabilities on a recurring or nonrecurring basis are discussed above. At March 31, 2015, December 31, 2014 and March 31, 2014, the estimated fair values of cash and cash equivalents, interest receivable and interest payable approximated their carrying values at those dates. The methodologies for other financial assets and financial liabilities follow.

Fair value measurement for investment securities — held-to-maturity is based upon quoted prices, if available. If quoted prices are not available, fair values are measured using independent pricing models or other model-based valuation techniques that include market inputs such as benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers, reference data and industry and economic events. Fair value measurements using Level 2 valuations of investment securities — held-to-maturity include the majority of the Corporation's investment securities issued by state and political subdivisions. Level 3 valuations include certain securities issued by state and political subdivisions and trust preferred investment securities.

Fair value measurements of nonmarketable equity securities, which consisted of Federal Home Loan Bank (FHLB) and Federal Reserve Bank (FRB) stock, are based on their redeemable value, which is cost. The market for these securities is restricted to the issuer of the stock and subject to impairment evaluation. It is not practicable to determine the fair value of these securities within the fair value hierarchy due to the restrictions placed on their transferability.

Loans held-for-sale are carried at fair value, as the Corporation elected the fair value option on these loans. The fair values of loans held-for-sale are based on the market price for similar loans sold in the secondary market, and therefore, are classified as Level 2 valuations.

The fair value of variable interest rate loans that reprice regularly with changes in market interest rates are based on carrying values. The fair values for fixed interest rate loans are estimated using discounted cash flow analyses, using the Corporation’s interest rates currently being offered for loans with similar terms to borrowers of similar credit quality. The resulting fair value amounts are adjusted to estimate the impact of changes in the credit quality of borrowers after the loans were originated. The fair value measurements for loans are Level 3 valuations.

The fair values of deposit accounts without defined maturities, such as interest- and noninterest-bearing checking, savings and money market accounts, are equal to the amounts payable on demand. Fair value measurements for fixed-interest rate time deposits with defined maturities are based on the discounted value of contractual cash flows, using the Corporation’s interest rates currently being offered for deposits of similar maturities, and are Level 3 valuations. The fair values for variable-interest rate time deposits with defined maturities approximate their carrying amounts.

Short-term borrowings consist of securities sold under agreements to repurchase, short-term FHLB advances and federal funds purchased. Fair value measurements for short-term borrowings are based on the present value of future estimated cash flows using current interest rates offered to the Corporation for debt with similar terms and are Level 2 valuations.

Fair value measurements for long-term FHLB advances are estimated based on the present value of future estimated cash flows using current interest rates offered to the Corporation for debt with similar terms and are Level 2 valuations.

The Corporation’s unused commitments to extend credit, standby letters of credit and loan commitments have no carrying amount and have been estimated to have no realizable fair value. Historically, a majority of the unused commitments to extend credit have not been drawn upon and, generally, the Corporation does not receive fees in connection with these commitments other than standby letter of credit fees, which are not significant.

Fair value measurements have not been made for items that are not defined by GAAP as financial instruments, including such items as the value of the Corporation’s Wealth Management department and the value of the Corporation’s core deposit base. The Corporation believes it is impractical to estimate a representative fair value for these types of assets, even though management believes they add significant value to the Corporation.

A summary of carrying amounts and estimated fair values of the Corporation’s financial instruments included in the consolidated statements of financial position was as follows:

	Level in Fair Value Measurement Hierarchy	March 31, 2015				December 31, 2014				March 31, 2014
		Carrying Amount		Fair Value		Carrying Amount		Fair Value		Carrying Amount		Fair Value
		(In thousands)
Assets:
Cash and cash equivalents	Level 1	$	393,938	$	393,938	$	183,020	$	183,020	$	382,385	$	382,385
Investment securities:
Available-for-sale	Level 1	8,302		8,302		8,259		8,259		—		—
Available-for-sale	Level 2	672,342		672,342		740,605		740,605		657,818		657,818
Held-to-maturity	Level 2	370,950		372,876		305,913		308,650		267,599		265,947
Held-to-maturity	Level 3	10,500		7,300		10,500		7,090		10,500		6,460
Nonmarketable equity securities	NA	31,249		31,249		27,369		27,369		25,572		25,572
Loans held-for-sale	Level 2	9,675		9,675		9,128		9,128		3,814		3,814
Net loans	Level 3	5,627,618		5,633,217		5,612,547		5,623,454		4,674,816		4,688,814
Interest receivable	Level 2	19,816		19,816		17,492		17,492		16,945		16,945
Liabilities:
Deposits without defined maturities	Level 2	$	4,988,268	$	4,988,268	$	4,741,024	$	4,741,024	$	3,868,700	$	3,868,700
Time deposits	Level 3	1,332,085		1,335,605		1,337,947		1,340,015		1,362,593		1,371,312
Interest payable	Level 2	779		779		755		755		876		876
Short-term borrowings	Level 2	372,236		372,236		389,467		389,467		361,231		361,231

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Document and Entity Information	3 Months Ended
	Mar. 31, 2015	Apr. 17, 2015
Entity Information [Line Items]
Entity Registrant Name	CHEMICAL FINANCIAL CORP
Entity Central Index Key	0000019612
Document Type	10-Q
Document Period End Date	Mar. 31, 2015
Amendment Flag	false
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		33,711,700

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Earnings Per Common Share

3 Months Ended

Mar. 31, 2015

Earnings Per Share [Abstract]

Earnings Per Common Share

Earnings Per Common Share

Basic earnings per common share for the Corporation is computed by dividing net income by the weighted average number of common shares outstanding during the period. Basic earnings per common share excludes any dilutive effect of common stock equivalents.

Diluted earnings per common share for the Corporation is computed by dividing net income by the sum of the weighted average number of common shares outstanding and the dilutive effect of common stock equivalents using the treasury stock method. Average shares of common stock for diluted net income per common share include shares to be issued upon the exercise of stock options granted under the Corporation’s share-based compensation plans, restricted stock units that may be converted to stock, stock to be issued under the deferred stock compensation plan for non-employee directors and stock to be issued under the stock purchase plan for non-employee advisory directors. For any period in which a net loss is recorded, the assumed exercise of stock options, restricted stock units that may be converted to stock and stock to be issued under the deferred stock compensation plan and the stock purchase plan would have an anti-dilutive impact on the net loss per common share and thus are excluded in the diluted earnings per common share calculation.

The following summarizes the numerator and denominator of the basic and diluted earnings per common share computations:

	Three Months Ended March 31,
	2015		2014
	(In thousands, except per share data)
Numerator for both basic and diluted earnings per common share, net income	$	17,835	$	13,813
Denominator for basic earnings per common share, weighted average common shares outstanding	32,809		29,825
Weighted average common stock equivalents	235		212
Denominator for diluted earnings per common share	33,044		30,037
Basic earnings per common share	$	0.54	$	0.46
Diluted earnings per common share	0.54		0.46

The average number of exercisable employee stock option awards outstanding that were “out-of-the-money,” whereby the option exercise price per share exceeded the market price per share and, therefore, were not included in the computation of diluted earnings per common share because they would have been anti-dilutive totaled 121,050 and 259,288 for the three months ended March 31, 2015 and 2014, respectively.

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Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Interest Income
Interest and fees on loans	$ 58,097	$ 49,195
Interest on investment securities:
Taxable	2,307	2,383
Tax-exempt	1,906	1,704
Dividends on nonmarketable equity securities	198	238
Interest on deposits with the Federal Reserve Bank and other banks	122	125
Total interest income	62,630	53,645
Interest Expense
Interest on deposits	3,352	3,745
Interest on short-term borrowings	98	121
Total interest expense	3,450	3,866
Net Interest Income	59,180	49,779
Provision for loan losses	1,500	1,600
Net interest income after provision for loan losses	57,680	48,179
Noninterest Income
Service charges and fees on deposit accounts	5,916	4,930
Wealth management revenue	5,071	3,631
Other charges and fees for customer services	5,990	4,194
Mortgage banking revenue	1,403	794
Gain on sale of investment securities	579	0
Other	316	167
Total noninterest income	19,275	13,716
Operating Expenses
Salaries, wages and employee benefits	29,268	24,184
Occupancy	4,426	4,374
Equipment and software	4,738	3,461
Other	12,588	10,163
Total operating expenses	51,020	42,182
Income before income taxes	25,935	19,713
Federal income tax expense	8,100	5,900
Net Income	$ 17,835	$ 13,813
Net Income Per Common Share:
Basic (in dollars per share)	$ 0.54	$ 0.46
Diluted (in dollars per share)	$ 0.54	$ 0.46
Cash Dividends Declared Per Common Share (dollars per share)	$ 0.24	$ 0.23

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Investment Securities

3 Months Ended

Mar. 31, 2015

Investments, Debt and Equity Securities [Abstract]

Investment Securities

Investment Securities

The following is a summary of the amortized cost and fair value of investment securities available-for-sale and investment securities held-to-maturity at March 31, 2015, December 31, 2014 and March 31, 2014:

	Investment Securities Available-for-Sale
	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value
	(In thousands)
March 31, 2015
U.S. Treasury securities	$	8,271	$	31	$	—	$	8,302
Government sponsored agencies	249,642		889		101		250,430
State and political subdivisions	31,701		624		3		32,322
Residential mortgage-backed securities	218,299		1,358		56		219,601
Collateralized mortgage obligations	133,713		305		718		133,300
Corporate bonds	34,925		136		64		34,997
Preferred stock	1,389		303		—		1,692
Total	$	677,940	$	3,646	$	942	$	680,644
December 31, 2014
U.S. Treasury securities	$	8,272	$	—	$	13	$	8,259
Government sponsored agencies	263,658		356		511		263,503
State and political subdivisions	45,157		1,087		17		46,227
Residential mortgage-backed securities	240,465		885		1,543		239,807
Collateralized mortgage obligations	145,316		261		1,194		144,383
Corporate bonds	44,930		213		48		45,095
Preferred stock	1,389		201		—		1,590
Total	$	749,187	$	3,003	$	3,326	$	748,864
March 31, 2014
Government sponsored agencies	$	91,613	$	295	$	298	$	91,610
State and political subdivisions	42,369		1,408		—		43,777
Residential mortgage-backed securities	291,187		1,023		3,472		288,738
Collateralized mortgage obligations	167,622		393		1,296		166,719
Corporate bonds	65,003		505		93		65,415
Preferred stock	1,389		170		—		1,559
Total	$	659,183	$	3,794	$	5,159	$	657,818

	Investment Securities Held-to-Maturity
	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value
	(In thousands)
March 31, 2015
State and political subdivisions	$	370,950	$	6,852	$	4,926	$	372,876
Trust preferred securities	10,500		—		3,200		7,300
Total	$	381,450	$	6,852	$	8,126	$	380,176
December 31, 2014
State and political subdivisions	$	305,913	$	7,294	$	4,557	$	308,650
Trust preferred securities	10,500		—		3,410		7,090
Total	$	316,413	$	7,294	$	7,967	$	315,740
March 31, 2014
State and political subdivisions	$	267,599	$	5,331	$	6,983	$	265,947
Trust preferred securities	10,500		—		4,040		6,460
Total	$	278,099	$	5,331	$	11,023	$	272,407

The majority of the Corporation’s residential mortgage-backed securities and collateralized mortgage obligations are backed by a U.S. government agency (Government National Mortgage Association) or a government sponsored enterprise (Federal Home Loan Mortgage Corporation or Federal National Mortgage Association).

At March 31, 2015, the Corporation held $10.5 million of trust preferred investment securities that were recorded as held-to-maturity, with $10.0 million of these securities representing a 100% interest in a trust preferred investment security of a small non-public bank holding company in Michigan that has been assessed by the Corporation as financially strong. The remaining $0.5 million represents a 10% interest in another trust preferred investment security of a small non-public bank holding company located in Michigan that was categorized as well-capitalized under regulatory guidelines at March 31, 2015.

At March 31, 2015, it was the Corporation’s opinion that the market for trust preferred investment securities was not active, and thus, in accordance with GAAP, when there is a significant decrease in the volume and activity for an asset or liability in relation to normal market activity, adjustments to transaction or quoted prices may be necessary or a change in valuation technique or multiple valuation techniques may be appropriate. The Corporation obtained pricing information for its trust preferred investment securities from an independent third-party pricing source. The pricing information was based on both observable inputs and unobservable inputs, including appropriate risk adjustments that market participants would make for possible nonperformance, illiquidity and issuer specifics such as size, leverage position and location. The observable inputs were based on the existing market and insight into appropriate rate of return adjustments that market participants would require for the additional risk associated with a single issue investment security of this nature. Based on the information obtained from the independent third-party pricing source, the Corporation calculated a fair value at March 31, 2015 of $7.0 million on its $10.0 million trust preferred investment security and $0.3 million on its $0.5 million trust preferred investment security, resulting in a combined unrealized loss of $3.2 million at that date.

The following is a summary of the amortized cost and fair value of investment securities at March 31, 2015, by maturity, for both available-for-sale and held-to-maturity investment securities. The maturities of residential mortgage-backed securities and collateralized mortgage obligations are based on scheduled principal payments. The maturities of all other debt securities are based on final contractual maturity.

	March 31, 2015
	Amortized Cost		Fair Value
	(In thousands)
Investment Securities Available-for-Sale:
Due in one year or less	$	180,558	$	180,869
Due after one year through five years	442,088		443,752
Due after five years through ten years	50,902		51,302
Due after ten years	3,003		3,029
Preferred stock	1,389		1,692
Total	$	677,940	$	680,644
Investment Securities Held-to-Maturity:
Due in one year or less	$	35,293	$	35,365
Due after one year through five years	171,557		172,699
Due after five years through ten years	120,799		122,512
Due after ten years	53,801		49,600
Total	$	381,450	$	380,176

The following schedule summarizes information for both available-for-sale and held-to-maturity investment securities with gross unrealized losses at March 31, 2015, December 31, 2014 and March 31, 2014, aggregated by category and length of time that individual securities have been in a continuous unrealized loss position.

	Less Than 12 Months				12 Months or More				Total
	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
	(In thousands)
March 31, 2015
U.S. Treasury securities	$	—	$	—	$	—	$	—	$	—	$	—
Government sponsored agencies	27,889		64		18,896		37		46,785		101
State and political subdivisions	156,010		1,989		49,839		2,940		205,849		4,929
Residential mortgage-backed securities	82,303		28		3,847		28		86,150		56
Collateralized mortgage obligations	22,694		22		41,061		696		63,755		718
Corporate bonds	4,989		11		14,946		53		19,935		64
Trust preferred securities	—		—		7,300		3,200		7,300		3,200
Total	$	293,885	$	2,114	$	135,889	$	6,954	$	429,774	$	9,068
December 31, 2014
U.S. Treasury securities	$	8,259	$	13	$	—	$	—	$	8,259	$	13
Government sponsored agencies	166,963		406		31,927		105		198,890		511
State and political subdivisions	62,310		3,348		36,847		1,226		99,157		4,574
Residential mortgage-backed securities	17,276		52		180,194		1,491		197,470		1,543
Collateralized mortgage obligations	63,077		179		31,620		1,015		94,697		1,194
Corporate bonds	—		—		14,952		48		14,952		48
Trust preferred securities	—		—		7,090		3,410		7,090		3,410
Total	$	317,885	$	3,998	$	302,630	$	7,295	$	620,515	$	11,293
March 31, 2014
Government sponsored agencies	$	45,396	$	110	$	15,204	$	188	$	60,600	$	298
State and political subdivisions	79,787		4,942		56,180		2,041		135,967		6,983
Residential mortgage-backed securities	247,397		3,472		—		—		247,397		3,472
Collateralized mortgage obligations	76,900		885		12,833		411		89,733		1,296
Corporate bonds	—		—		14,907		93		14,907		93
Trust preferred securities	—		—		6,460		4,040		6,460		4,040
Total	$	449,480	$	9,409	$	105,584	$	6,773	$	555,064	$	16,182

An assessment is performed quarterly by the Corporation to determine whether unrealized losses in its investment securities portfolio are temporary or other-than-temporary by carefully considering all available information. The Corporation reviews factors such as financial statements, credit ratings, news releases and other pertinent information of the underlying issuer or company to make its determination. Management did not believe any individual unrealized loss on any investment security, as of March 31, 2015, represented an other-than-temporary impairment (OTTI). Management believed that the unrealized losses on investment securities at March 31, 2015 were temporary in nature and due primarily to changes in interest rates and reduced market liquidity and not as a result of credit-related issues. Unrealized losses of $3.2 million in the trust preferred securities portfolio, related to trust preferred securities of two well-capitalized bank holding companies in Michigan, were attributable to illiquidity in financial markets for these types of investments. The Corporation performed an analysis of the creditworthiness of these issuers and concluded that, at March 31, 2015, the Corporation expected to recover the entire amortized cost basis of these investment securities.

At March 31, 2015, the Corporation did not have the intent to sell any of its impaired investment securities and believed that it was more-likely-than-not that the Corporation will not have to sell any such investment securities before a full recovery of amortized cost. Accordingly, at March 31, 2015, the Corporation believed the impairments in its investment securities portfolio were temporary in nature. However, there is no assurance that OTTI may not occur in the future.

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Acquisitions

3 Months Ended

Mar. 31, 2015

Business Combinations [Abstract]

Acquisitions

Acquisitions

Pending Acquisition of Lake Michigan Financial Corporation

On January 5, 2015, the Corporation entered into an Agreement and Plan of Merger with Lake Michigan Financial Corporation (Lake Michigan). Under the terms of the merger agreement, each Lake Michigan shareholder will receive $16.64 in cash and 1.326 shares of the Corporation's common stock for each share of Lake Michigan common stock. Based on the 30-day volume weighted price per share of the Corporation's common stock as of January 5, 2015, the merger has a transaction value of approximately $184.1 million. The merger has received regulatory approval. Completion of the merger is subject to the approval of Lake Michigan's shareholders, in addition to satisfaction of other customary closing conditions.

Acquisition of Monarch Community Bancorp, Inc.

On April 1, 2015, the Corporation acquired all of the outstanding stock of Monarch Community Bancorp, Inc. (Monarch) in an all-stock transaction valued at $27.2 million. As a result of the acquisition, the Corporation issued approximately 861,000 shares of its common stock based on an exchange ratio of 0.0982 shares of its common stock for each share of Monarch common stock outstanding. There are no contingencies resulting from the acquisition.

Monarch, a bank holding company, owned Monarch Community Bank, which operates five full service branch offices in Coldwater, Marshall, Hillsdale and Union City, Michigan. Monarch Community Bank will be operated as a separate subsidiary of the Corporation until its planned consolidation with and into Chemical Bank in May 2015. At March 31, 2015, and without the effect of fair value purchase accounting adjustments, Monarch had total assets of $170 million, total loans of $128 million and total deposits of $143 million.

Certain disclosures are required by the Corporation for business combinations that have occurred after the reporting date but before the financial statements are issued, unless the initial accounting for the business combination is incomplete at the time the financial statements are issued. The Corporation is in the process of completing its initial accounting related to the acquisition of Monarch, including finalizing the fair values of the assets acquired and liabilities assumed, and expects to have this information available for disclosure when it files its Quarterly Report on Form 10-Q for the quarter ending June 30, 2015.

Acquisition of Northwestern Bancorp, Inc.

On October 31, 2014, the Corporation acquired all of the outstanding stock of Northwestern Bancorp, Inc. (Northwestern) for total cash consideration of $121 million. Northwestern, a bank holding company which owned Northwestern Bank, provided traditional banking services and products through 25 banking offices serving communities in the northwestern lower peninsula of Michigan. At the acquisition date, Northwestern added total assets of $815 million, including total loans of $475 million, and total deposits of $794 million to the Corporation. Northwestern Bank was consolidated with and into Chemical Bank as of the acquisition date. In connection with the acquisition of Northwestern, the Corporation recorded $60.0 million of goodwill, which was primarily attributable to the synergies and economies of scale expected from combining the operations of the Corporation and Northwestern. In addition, the Corporation recorded $12.9 million of core deposit intangible assets in conjunction with the acquisition.

Upon acquisition, the Northwestern loan portfolio had contractually required principal and interest payments receivable of $507 million and $112 million, respectively, expected principal and interest cash flows of $481 million and $104 million, respectively, and a fair value of $475 million. The difference between the contractually required payments receivable and the expected cash flows represents the nonaccretable difference, which totaled $34 million at the acquisition date, with $26 million attributable to expected credit losses. The difference between the expected cash flows and fair value represents the accretable yield, which totaled $110 million at the acquisition date. The outstanding contractual principal balance and the carrying amount of the Northwestern acquired loan portfolio were $453 million and $421 million, respectively, at March 31, 2015, compared to $485 million and $452 million, respectively, at December 31, 2014.

Acquisition of 21 Branches

On December 7, 2012, Chemical Bank acquired 21 branches from Independent Bank, a subsidiary of Independent Bank Corporation, located in the Northeast and Battle Creek regions of Michigan, including $404 million in deposits and $44 million in loans (branch acquisition transaction). The purchase price of the branch offices, including equipment, was $8.1 million and the Corporation paid a premium on deposits of $11.5 million, or approximately 2.85% of total deposits. The loans were purchased at a discount of 1.75%. In connection with the branch acquisition transaction, the Corporation recorded goodwill of $6.8 million and other intangible assets attributable to customer core deposits of $5.6 million.

Acquisition of O.A.K. Financial Corporation (OAK)

On April 30, 2010, the Corporation acquired OAK in an all-stock transaction for total consideration of $83.7 million. OAK provided traditional banking services and products through 14 banking offices serving communities in Ottawa, Allegan and Kent counties in west Michigan. At the acquisition date, OAK added total assets of $820 million, including total loans of $627 million, and total deposits of $693 million, including brokered deposits of $193 million. Upon acquisition, the OAK loan portfolio had contractually required principal payments receivable of $683 million and a fair value of $627 million. The outstanding contractual principal balance and the carrying amount of the OAK acquired loan portfolio were $255 million and $234 million, respectively, at March 31, 2015, compared to $268 million and $246 million, respectively, at December 31, 2014 and $313 million and $289 million, respectively, at March 31, 2014.

Accretable Yield

Activity for the accretable yield, which includes contractually due interest for acquired loans that have been renewed or extended since the date of acquisition and continue to be accounted for in loan pools in accordance with ASC 310-30, follows:

	Three Months Ended March 31,
	2015									2014
	Northwestern			OAK			Total			OAK
	(In thousands)
Balance at beginning of period	$	104,675		$	33,286		137,961			$	32,610
Additions (reductions)*	(1,410		)	714			(696		)	821
Accretion recognized in interest income	(4,998		)	(3,207		)	(8,205		)	(3,843		)
Reclassification from nonaccretable difference	—			—			—			10,000
Balance at end of period	$	98,267		$	30,793		$	129,060		$	39,588

* Represents additions of estimated contractual interest expected to be collected from acquired loans being renewed or extended, less reductions in contractual interest resulting from the early payoff of acquired loans.

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Acquisitions (Tables)

3 Months Ended

Mar. 31, 2015

Business Combinations [Abstract]

Activity for accretable yield includes contractually due interest of acquired loans

Activity for the accretable yield, which includes contractually due interest for acquired loans that have been renewed or extended since the date of acquisition and continue to be accounted for in loan pools in accordance with ASC 310-30, follows:

	Three Months Ended March 31,
	2015									2014
	Northwestern			OAK			Total			OAK
	(In thousands)
Balance at beginning of period	$	104,675		$	33,286		137,961			$	32,610
Additions (reductions)*	(1,410		)	714			(696		)	821
Accretion recognized in interest income	(4,998		)	(3,207		)	(8,205		)	(3,843		)
Reclassification from nonaccretable difference	—			—			—			10,000
Balance at end of period	$	98,267		$	30,793		$	129,060		$	39,588

* Represents additions of estimated contractual interest expected to be collected from acquired loans being renewed or extended, less reductions in contractual interest resulting from the early payoff of acquired loans.

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Share-Based Compensation

3 Months Ended

Mar. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share-Based Compensation

Share-Based Compensation

The Corporation maintains a share-based compensation plan under which it periodically grants share-based awards for a fixed number of shares to certain officers of the Corporation. The fair value of share-based awards is recognized as compensation expense over the requisite service or performance period. During the three-month periods ended March 31, 2015 and 2014, share-based compensation expense related to stock options, restricted stock units and other share-based awards totaled $0.8 million and $0.6 million, respectively.

During the three-month period ended March 31, 2015, the Corporation granted options to purchase 244,165 shares of common stock and 76,286 restricted stock units to certain officers. At March 31, 2015, there were 32,953 shares of common stock available for future grants under the share-based compensation plan. On April 20, 2015, the shareholders of the Corporation approved the Stock Incentive Plan of 2015, which provides for 1,300,000 shares of the Corporation's common stock to be made available for future equity-based awards and cancels the amount of shares available for future grant under prior share-based compensation plans.

Stock Options

The Corporation issues stock options to certain officers. Stock options are issued at the current market price of the Corporation's common stock on the date of grant and expire ten years from the date of grant. Stock options granted after 2012 vest ratably over a five-year period. Stock options granted prior to 2013 generally vest ratably over a three-year period.

A summary of activity for the Corporation’s stock options as of and for the three months ended March 31, 2015 is presented below:

	Non-Vested Stock Options Outstanding						Stock Options Outstanding
	Number of Options		Weighted- Average Exercise Price Per Share		Weighted- Average Grant Date Fair Value Per Share		Number of Options		Weighted- Average Exercise Price Per Share
Outstanding at December 31, 2014	432,199		$	26.75	$	8.30	1,037,311		$	25.90
Granted	244,165		30.18		8.40		244,165		30.18
Exercised	—		—		—		(37,191	)	23.11
Vested	(150,224	)	25.57		7.80		—		—
Forfeited/expired	(3,049	)	27.42		8.59		(3,049	)	27.42
Outstanding at March 31, 2015	523,091		$	28.69	$	8.49	1,241,236		$	26.82
Exercisable/vested at March 31, 2015							718,145		$	25.46

The weighted-average remaining contractual terms were 6.6 years for all outstanding stock options and 4.7 years for exercisable stock options at March 31, 2015. The intrinsic value of all outstanding in-the-money stock options and exercisable in-the-money stock options was $5.7 million and $4.4 million, respectively, at March 31, 2015. The aggregate intrinsic values of outstanding and exercisable options at March 31, 2015 were calculated based on the closing market price of the Corporation’s common stock on March 31, 2015 of $31.36 per share less the exercise price. Options with intrinsic values less than zero, or “out-of-the-money” options, were not included in the aggregate intrinsic value reported.

At March 31, 2015, unrecognized compensation expense related to stock options totaled $4.4 million and is expected to be recognized over a remaining weighted average period of 4.2 years.

The fair value of the stock options granted during the three months ended March 31, 2015 was estimated on the date of grant using the Black-Scholes option pricing model with the following assumptions.

Expected dividend yield	3.50		%
Risk-free interest rate	1.78		%
Expected stock price volatility	39.1		%
Expected life of options – in years	7.0
Weighted average fair value of options granted	$	8.40

Restricted Stock Units

In addition to stock options, the Corporation grants restricted stock performance units and restricted stock service-based units (collectively referred to as restricted stock units) to certain officers. The restricted stock performance units vest based on the Corporation achieving certain performance target levels. The restricted stock performance units are eligible to vest from 0.25x to 1.5x the number of units originally granted depending on which, if any, of the performance target levels are met. However, if the minimum performance target level is not achieved, no shares will become vested or be issued for that respective year’s restricted stock performance units. The restricted stock service-based units vest upon satisfaction of a service condition. Upon achievement of the performance target level and/or satisfaction of a service condition, if applicable, the restricted stock units are converted into shares of the Corporation’s common stock on a one-to-one basis. Compensation expense related to restricted stock units is recognized over the expected requisite performance or service period, as applicable.

A summary of the activity for restricted stock units as of and for the three months ended March 31, 2015 is presented below:

	Number of Units		Weighted- Average Grant Date Fair Value  Per Unit
Outstanding at December 31, 2014	204,319		$	24.14
Granted	76,286		28.15
Converted into shares of common stock	(66,769	)	22.32
Forfeited/expired	(405	)	25.17
Outstanding at March 31, 2015	213,431		$	26.14

At March 31, 2015, unrecognized compensation expense related to restricted stock unit awards totaled $4.1 million and is expected to be recognized over a remaining weighted average period of 3.0 years.

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Accumulated Other Comprehensive Loss

3 Months Ended

Mar. 31, 2015

Equity [Abstract]

Accumulated Other Comprehensive Loss

Accumulated Other Comprehensive Loss

The components of accumulated other comprehensive loss, net of related tax benefit/expense, were as follows:

	March 31, 2015			December 31, 2014			March 31, 2014
	(In thousands)
Net unrealized gains (losses) on investment securities – available-for-sale, net of related tax expense (benefit) of $946 at March 31, 2015, $(113) at December 31, 2014 and $(478) at March 31, 2014	$	1,758		$	(210	)	$	(887	)
Pension and other postretirement benefits adjustment, net of related tax benefit of $16,981 at March 31, 2015, $17,362 at December 31, 2014 and $9,915 at March 31, 2014	(31,537		)	(32,243		)	(18,414		)
Accumulated other comprehensive loss	$	(29,779	)	$	(32,453	)	$	(19,301	)

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Regulatory Capital (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Risk weighted assets	$ 5,580,000,000	$ 5,700,000,000	$ 4,760,000,000
Chemical Financial Corporation [Member]
Total Capital to Risk-Weighted Assets:
Actual, Capital Amount	727,090,000	705,130,000	659,644,000
Minimum Required for Capital Adequacy Purposes, Capital Amount	446,173,000	456,302,000	381,146,000
Actual, Ratio	13.00%	12.40%	13.80%
Minimum Required for Capital Adequacy Purposes, Ratio	8.00%	8.00%	8.00%
Tier 1 Capital to Risk-Weighted Assets:
Actual, Capital Amount	657,307,000	633,779,000	599,856,000
Minimum Required for Capital Adequacy Purposes, Capital Amount	334,630,000	228,151,000	190,573,000
Actual, Ratio	11.80%	11.10%	12.60%
Minimum Required for Capital Adequacy Purposes, Ratio	6.00%	4.00%	4.00%
Common Equity Tier One Risk Based Capital	657,307,000
Common Equity Tier One Risk Based Capital to Risk Weighted Assets	11.80%
Common Equity Tier One Risk Based Capital for Capital Adequacy	250,972,000
Common Equity Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	4.50%
Leverage Ratio:
Actual, Capital Amount	657,307,000	633,779,000	599,856,000
Minimum Required for Capital Adequacy Purposes, Capital Amount	289,948,000	273,226,000	243,070,000
Actual, Ratio	9.10%	9.30%	9.90%
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	676,488,000	654,031,000	589,254,000
Minimum Required for Capital Adequacy Purposes, Capital Amount	445,471,000	455,633,000	380,542,000
Required to be Well Capitalized Under Prompt Corrective Action Regulations, Capital Amount	556,838,000	569,541,000	475,678,000
Actual, Ratio	12.10%	11.50%	12.40%
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	606,813,000	582,783,000	529,560,000
Minimum Required for Capital Adequacy Purposes, Capital Amount	334,103,000	227,816,000	190,271,000
Required to be Well Capitalized Under Prompt Corrective Action Regulations, Capital Amount	445,471,000	341,725,000	285,407,000
Actual, Ratio	10.90%	10.20%	11.10%
Minimum Required for Capital Adequacy Purposes, Ratio	6.00%	4.00%	4.00%
Required to be Well Capitalized Under Prompt Corrective Action Regulations, Ratio	8.00%	6.00%	6.00%
Common Equity Tier One Risk Based Capital	606,813,000
Common Equity Tier One Risk Based Capital to Risk Weighted Assets	10.90%
Common Equity Tier One Risk Based Capital for Capital Adequacy	250,577,000
Common Equity Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	4.50%
Common Equity Tier One Risk Based Capital to be Well Capitalized	361,945,000
Common Equity Tier One Risk Based Capital Required to Be Well Capitalized to Risk Weighted Assets	6.50%
Leverage Ratio:
Actual, Capital Amount	606,813,000	582,783,000	529,560,000
Minimum Required for Capital Adequacy Purposes, Capital Amount	289,840,000	273,048,000	242,939,000
Required to be Well Capitalized Under Prompt Corrective Action Regulations, Capital Amount	$ 362,300,000	$ 341,310,000	$ 303,673,000
Actual, Ratio	8.40%	8.50%	8.70%
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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Loans

3 Months Ended

Mar. 31, 2015

Receivables [Abstract]

Loans

Loans

Loan portfolio segments are defined as the level at which an entity develops and documents a systematic methodology to determine its allowance. The Corporation has two loan portfolio segments (commercial loans and consumer loans) that it uses in determining the allowance. Both quantitative and qualitative factors are used by management at the loan portfolio segment level in determining the adequacy of the allowance for the Corporation. Classes of loans are a disaggregation of an entity’s loan portfolio segments. Classes of loans are defined as a group of loans which share similar initial measurement attributes, risk characteristics, and methods for monitoring and assessing credit risk. The Corporation has seven classes of loans, which are set forth below.

Commercial — Loans and lines of credit to varying types of businesses, including municipalities, school districts and nonprofit organizations, for the purpose of supporting working capital, operational needs and term financing of equipment. Repayment of such loans is generally provided through operating cash flows of the business. Commercial loans are predominately secured by equipment, inventory, accounts receivable, personal guarantees of the owner and other sources of repayment, although the Corporation may also secure commercial loans with real estate.

Commercial real estate — Loans secured by real estate occupied by the borrower for ongoing operations, non-owner occupied real estate leased to one or more tenants and vacant land that has been acquired for investment or future land development.

Real estate construction — Secured loans for the construction of business properties. Real estate construction loans often convert to a commercial real estate loan at the completion of the construction period.

Land development — Secured development loans made to borrowers for the purpose of infrastructure improvements to vacant land to create finished marketable residential and commercial lots/land. Most land development loans are originated with the intention that the loans will be paid through the sale of developed lots/land by the developers within twelve months of the completion date. Land development loans at March 31, 2015, December 31, 2014 and March 31, 2014 were primarily comprised of loans to develop residential properties.

Residential mortgage — Loans secured by one- to four-family residential properties, generally with fixed interest rates for periods of fifteen years or less. The loan-to-value ratio at the time of origination is generally 80% or less. Residential mortgage loans with a loan-to-value ratio of more than 80% generally require private mortgage insurance.

Consumer installment — Loans to consumers primarily for the purpose of acquiring automobiles, recreational vehicles and personal watercraft. These loans consist of relatively small amounts that are spread across many individual borrowers.

Home equity — Loans and lines of credit whereby consumers utilize equity in their personal residence, generally through a second mortgage, as collateral to secure the loan.

Commercial, commercial real estate, real estate construction and land development loans are referred to as the Corporation’s commercial loan portfolio, while residential mortgage, consumer installment and home equity loans are referred to as the Corporation’s consumer loan portfolio. A summary of loans follows:

	March 31, 2015		December 31, 2014		March 31, 2014
	(In thousands)
Commercial loan portfolio:
Commercial	$	1,356,169	$	1,354,881	$	1,208,641
Commercial real estate	1,616,923		1,557,648		1,279,167
Real estate construction	95,923		152,745		85,084
Land development	12,916		18,750		13,761
Subtotal	3,081,931		3,084,024		2,586,653
Consumer loan portfolio:
Residential mortgage	1,117,445		1,110,390		962,009
Consumer installment	844,066		829,570		675,412
Home equity	659,432		664,246		529,215
Subtotal	2,620,943		2,604,206		2,166,636
Total loans	$	5,702,874	$	5,688,230	$	4,753,289

Credit Quality Monitoring

The Corporation maintains loan policies and credit underwriting standards as part of the process of managing credit risk. These standards include making loans generally only within the Corporation’s market areas. The Corporation’s lending markets generally consist of communities across the lower peninsula of Michigan, except for the southeastern portion of Michigan. The Corporation has no foreign loans.

The Corporation has a commercial loan portfolio approval process involving underwriting and individual and group loan approval authorities to consider credit quality and loss exposure at loan origination. The loans in the Corporation’s commercial loan portfolio are risk rated at origination based on the grading system set forth below. The approval authority of relationship managers is established based on experience levels, with credit decisions greater than $1.0 million requiring group loan authority approval, except for six executive and senior officers who have varying limits exceeding $1.5 million and up to $3.5 million. During the first quarter of 2015, the Corporation increased the upper range for each level of group loan authority by$5.0 million, resulting in group loan authorities as follows. The Corporation has a loan committee, consisting of certain executive and senior officers, that meets weekly to consider loans ranging in amounts from $1.0 million to $10.0 million, depending on risk rating and credit action required. A directors’ loan committee, consisting of eight independent members of the board of directors, the chief executive officer and senior credit officer, meets bi-weekly to consider loans in amounts over $10.0 million, and certain loans under $10.0 million depending on a loan’s risk rating and credit action required. Loans over $15.0 million require majority approval of the board of directors.

The majority of the Corporation’s consumer loan portfolio is comprised of secured loans that are relatively small. The Corporation’s consumer loan portfolio has a centralized approval process which utilizes standardized underwriting criteria. The ongoing measurement of credit quality of the consumer loan portfolio is largely done on an exception basis. If payments are made on schedule, as agreed, then no further monitoring is performed. However, if delinquency occurs, the delinquent loans are turned over to the Corporation’s collection department for resolution, resulting in repossession or foreclosure if payments are not brought current. Credit quality for the entire consumer loan portfolio is measured by the periodic delinquency rate, nonaccrual amounts and actual losses incurred.

Loans in the commercial loan portfolio tend to be larger and more complex than those in the consumer loan portfolio, and therefore, are subject to more intensive monitoring. All loans in the commercial loan portfolio have an assigned relationship manager, and most borrowers provide periodic financial and operating information that allows the relationship managers to stay abreast of credit quality during the life of the loans. The risk ratings of loans in the commercial loan portfolio are reassessed at least annually, with loans below an acceptable risk rating reassessed more frequently and reviewed by various loan committees within the Corporation at least quarterly.

The Corporation maintains a centralized independent loan review function that monitors the approval process and ongoing asset quality of the loan portfolio, including the accuracy of loan grades. The Corporation also maintains an independent appraisal review function that participates in the review of all appraisals obtained by the Corporation for loans in the commercial loan portfolio.

Credit Quality Indicators

Commercial Loan Portfolio

The Corporation uses a nine grade risk rating system to monitor the ongoing credit quality of its commercial loan portfolio. These loan grades rank the credit quality of a borrower by measuring liquidity, debt capacity, coverage and payment behavior as shown in the borrower’s financial statements. The loan grades also measure the quality of the borrower’s management and the repayment support offered by any guarantors. A summary of the Corporation’s loan grades (or characteristics of the loans within each grade) follows:

Risk Grades 1-5 (Acceptable Credit Quality) — All loans in risk grades 1 through 5 are considered to be acceptable credit risks by the Corporation and are grouped for purposes of allowance for loan loss considerations and financial reporting. The five grades essentially represent a ranking of loans that are all viewed to be of acceptable credit quality, taking into consideration the various factors mentioned above, but with varying degrees of financial strength, debt coverage, management and factors that could impact credit quality. Business credits within risk grades 1 through 5 range from Risk Grade 1: Prime Quality (factors include: excellent business credit; excellent debt capacity and coverage; outstanding management; strong guarantors; superior liquidity and net worth; favorable loan-to-value ratios; debt secured by cash or equivalents, or backed by the full faith and credit of the U.S. Government) to Risk Grade 5: Acceptable Quality With Care (factors include: acceptable business credit, but with added risk due to specific industry or internal situations).

Risk Grade 6 (Watch) — A business credit that is not acceptable within the Corporation’s loan origination criteria; cash flow may not be adequate or is continually inconsistent to service current debt; financial condition has deteriorated as company trends/management have become inconsistent; the company is slow in furnishing quality financial information; working capital needs of the company are reliant on short-term borrowings; personal guarantees are weak and/or with little or no liquidity; the net worth of the company has deteriorated after recent or continued losses; the loan requires constant monitoring and attention from the Corporation; payment delinquencies becoming more serious; if left uncorrected, these potential weaknesses may, at some future date, result in deterioration of repayment prospects.

Risk Grade 7 (Substandard — Accrual) — A business credit that is inadequately protected by the current financial net worth and paying capacity of the obligor or of the collateral pledged, if any; management has deteriorated or has become non-existent; quality financial information is not available; a high level of maintenance is required by the Corporation; cash flow can no longer support debt requirements; loan payments are continually and/or severely delinquent; negative net worth; personal guaranty has become insignificant; a credit that has a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. The Corporation still expects a full recovery of all contractual principal and interest payments; however, a possibility exists that the Corporation will sustain some loss if deficiencies are not corrected.

Risk Grade 8 (Substandard — Nonaccrual) — A business credit accounted for on a nonaccrual basis that has all the weaknesses inherent in a loan classified as risk grade 7 with the added characteristic that the weaknesses are so pronounced that, on the basis of current financial information, conditions, and values, collection in full is highly questionable; a partial loss is possible and interest is no longer being accrued. This loan meets the definition of an impaired loan. The risk of loss requires analysis to determine whether a valuation allowance needs to be established.

Risk Grade 9 (Substandard — Doubtful) — A business credit that has all the weaknesses inherent in a loan classified as risk grade 8 and interest is no longer being accrued, but additional deficiencies make it highly probable that liquidation will not satisfy the majority of the obligation; the primary source of repayment is nonexistent and there is doubt as to the value of the secondary source of repayment; the possibility of loss is likely, but current pending factors could strengthen the credit. This loan meets the definition of an impaired loan. A loan charge-off is recorded when management deems an amount uncollectible; however, the Corporation will establish a valuation allowance for probable losses, if required.

The Corporation considers all loans graded 1 through 5 as acceptable credit risks and structures and manages such relationships accordingly. Periodic financial and operating data combined with regular loan officer interactions are deemed adequate to monitor borrower performance. Loans graded 6 and 7 are considered higher-risk credits than loans graded 1 through 5 and the frequency of loan officer contact and receipt of financial data is increased to stay abreast of borrower performance. Loans graded 8 and 9 are considered problematic and require special care. Further, loans graded 6 through 9 are managed and monitored regularly through a number of processes, procedures and committees, including oversight by a loan administration committee comprised of executive and senior management of the Corporation, which include highly structured reporting of financial and operating data, intensive loan officer intervention and strategies to exit, as well as potential management by the Corporation’s special assets group.

The following schedule presents the recorded investment of loans in the commercial loan portfolio by risk rating categories at March 31, 2015, December 31, 2014 and March 31, 2014:

	Commercial		Commercial Real Estate		Real Estate Construction		Land Development		Total
	(In thousands)
March 31, 2015
Originated Portfolio:
Risk Grades 1-5	$	1,176,021	$	1,175,373	$	93,864	$	2,633	$	2,447,891
Risk Grade 6	40,999		44,248		—		738		85,985
Risk Grade 7	28,983		27,961		1,396		601		58,941
Risk Grade 8	18,904		24,760		663		290		44,617
Risk Grade 9	—		6		—		—		6
Subtotal	1,264,907		1,272,348		95,923		4,262		2,637,440
Acquired Portfolio:
Risk Grades 1-5	71,422		318,113		—		6,724		396,259
Risk Grade 6	11,299		7,786		—		253		19,338
Risk Grade 7	6,509		12,735		—		140		19,384
Risk Grade 8	2,032		5,941		—		1,537		9,510
Risk Grade 9	—		—		—		—		—
Subtotal	91,262		344,575		—		8,654		444,491
Total	$	1,356,169	$	1,616,923	$	95,923	$	12,916	$	3,081,931
December 31, 2014
Originated Portfolio:
Risk Grades 1-5	$	1,171,817	$	1,114,529	$	134,668	$	2,952	$	2,423,966
Risk Grade 6	37,800		34,996		1,408		738		74,942
Risk Grade 7	29,863		29,935		2,502		613		62,913
Risk Grade 8	16,417		24,958		162		225		41,762
Risk Grade 9	1		8		—		—		9
Subtotal	1,255,898		1,204,426		138,740		4,528		2,603,592
Acquired Portfolio:
Risk Grades 1-5	76,780		321,018		14,005		11,789		423,592
Risk Grade 6	12,687		8,698		—		583		21,968
Risk Grade 7	4,089		12,478		—		197		16,764
Risk Grade 8	5,427		11,028		—		1,653		18,108
Risk Grade 9	—		—		—		—		—
Subtotal	98,983		353,222		14,005		14,222		480,432
Total	$	1,354,881	$	1,557,648	$	152,745	$	18,750	$	3,084,024
March 31, 2014
Originated Portfolio:
Risk Grades 1-5	$	1,060,743	$	1,034,517	$	70,750	$	3,831	$	2,169,841
Risk Grade 6	18,359		33,962		680		968		53,969
Risk Grade 7	33,768		32,671		815		700		67,954
Risk Grade 8	17,301		27,552		160		2,267		47,280
Risk Grade 9	950		16		—		—		966
Subtotal	1,131,121		1,128,718		72,405		7,766		2,340,010
Acquired Portfolio:
Risk Grades 1-5	67,326		139,130		12,679		3,906		223,041
Risk Grade 6	2,423		2,627		—		—		5,050
Risk Grade 7	3,635		7,753		—		—		11,388
Risk Grade 8	4,136		939		—		2,089		7,164
Risk Grade 9	—		—		—		—		—
Subtotal	77,520		150,449		12,679		5,995		246,643
Total	$	1,208,641	$	1,279,167	$	85,084	$	13,761	$	2,586,653

Consumer Loan Portfolio

The Corporation evaluates the credit quality of loans in the consumer loan portfolio based on the performing or nonperforming status of the loan. Loans in the consumer loan portfolio that are performing in accordance with original contractual terms and are less than 90 days past due and accruing interest are considered to be in a performing status, while those that are in nonaccrual status, contractually past due 90 days or more as to interest or principal payments or classified as a nonperforming TDR are considered to be in a nonperforming status. Nonaccrual TDRs in the consumer loan portfolio are included with nonaccrual loans, while other TDRs in the consumer loan portfolio are considered in a nonperforming status until they meet the Corporation’s definition of a performing TDR, at which time they are considered in a performing status.

The following schedule presents the recorded investment of loans in the consumer loan portfolio based on loans in a performing status and loans in a nonperforming status at March 31, 2015, December 31, 2014 and March 31, 2014:

	Residential Mortgage		Consumer Installment		Home Equity		Total Consumer
	(In thousands)
March 31, 2015
Originated Loans:
Performing	$	998,196	$	834,926	$	565,992	$	2,399,114
Nonperforming	9,376		433		2,299		12,108
Subtotal	1,007,572		835,359		568,291		2,411,222
Acquired Loans:
Performing	109,005		8,696		90,686		208,387
Nonperforming	868		11		455		1,334
Subtotal	109,873		8,707		91,141		209,721
Total	$	1,117,445	$	844,066	$	659,432	$	2,620,943
December 31, 2014
Originated Loans:
Performing	$	987,542	$	818,878	$	566,083	$	2,372,503
Nonperforming	10,459		500		3,013		13,972
Subtotal	998,001		819,378		569,096		2,386,475
Acquired Loans:
Performing	111,101		10,174		94,696		215,971
Nonperforming	1,288		18		454		1,760
Subtotal	112,389		10,192		95,150		217,731
Total	$	1,110,390	$	829,570	$	664,246	$	2,604,206
March 31, 2014
Originated Loans:
Performing	$	937,968	$	672,984	$	497,196	$	2,108,148
Nonperforming	12,833		806		2,668		16,307
Subtotal	950,801		673,790		499,864		2,124,455
Acquired Loans:
Performing	11,150		1,622		29,020		41,792
Nonperforming	58		—		331		389
Subtotal	11,208		1,622		29,351		42,181
Total	$	962,009	$	675,412	$	529,215	$	2,166,636

Nonperforming Loans

A summary of nonperforming loans follows:

	March 31, 2015		December 31, 2014		March 31, 2014
	(In thousands)
Nonaccrual loans:
Commercial	$	18,904	$	16,418	$	18,251
Commercial real estate	24,766		24,966		27,568
Real estate construction	663		162		160
Land development	290		225		2,267
Residential mortgage	6,514		6,706		6,589
Consumer installment	433		500		806
Home equity	1,870		1,667		2,046
Total nonaccrual loans	53,440		50,644		57,687
Accruing loans contractually past due 90 days or more as to interest or principal payments:
Commercial	52		170		43
Commercial real estate	148		—		730
Real estate construction	—		—		—
Land development	—		—		—
Residential mortgage	172		557		—
Consumer installment	—		—		—
Home equity	429		1,346		622
Total accruing loans contractually past due 90 days or more as to interest or principal payments	801		2,073		1,395
Nonperforming TDRs:
Commercial loan portfolio	15,810		15,271		11,218
Consumer loan portfolio	2,690		3,196		6,244
Total nonperforming TDRs	18,500		18,467		17,462
Total nonperforming loans	$	72,741	$	71,184	$	76,544

The Corporation’s nonaccrual loans at March 31, 2015, December 31, 2014 and March 31, 2014 included $37.3 million, $37.2 million and $44.4 million, respectively, of nonaccrual TDRs.

The Corporation had $2.2 million of residential mortgage loans that were in the process of foreclosure at March 31, 2015.

Impaired Loans

The following schedule presents impaired loans by classes of loans at March 31, 2015, December 31, 2014 and March 31, 2014:

	Recorded Investment		Unpaid Principal Balance		Related Valuation Allowance
	(In thousands)
March 31, 2015
Impaired loans with a valuation allowance:
Commercial	$	3,433	$	3,527	$	1,119
Commercial real estate	1,780		1,961		496
Real estate construction	—		—		—
Land development	—		—		—
Residential mortgage	19,887		19,887		297
Subtotal	25,100		25,375		1,912
Impaired loans with no related valuation allowance:
Commercial	33,733		39,382		—
Commercial real estate	57,628		79,696		—
Real estate construction	663		836		—
Land development	1,877		3,428		—
Residential mortgage	7,382		7,382		—
Consumer installment	444		444		—
Home equity	2,325		2,325		—
Subtotal	104,052		133,493		—
Total impaired loans:
Commercial	37,166		42,909		1,119
Commercial real estate	59,408		81,657		496
Real estate construction	663		836		—
Land development	1,877		3,428		—
Residential mortgage	27,269		27,269		297
Consumer installment	444		444		—
Home equity	2,325		2,325		—
Total	$	129,152	$	158,868	$	1,912
December 31, 2014
Impaired loans with a valuation allowance:
Commercial	$	966	$	1,040	$	293
Commercial real estate	2,587		2,927		710
Real estate construction	—		—		—
Land development	—		—		—
Residential mortgage	19,681		19,681		335
Subtotal	23,234		23,648		1,338
Impaired loans with no related valuation allowance:
Commercial	38,094		44,557		—
Commercial real estate	60,616		82,693		—
Real estate construction	162		255		—
Land development	1,928		3,484		—
Residential mortgage	7,994		7,994		—
Consumer installment	518		518		—
Home equity	2,121		2,121		—
Subtotal	111,433		141,622		—
Total impaired loans:
Commercial	39,060		45,597		293
Commercial real estate	63,203		85,620		710
Real estate construction	162		255		—
Land development	1,928		3,484		—
Residential mortgage	27,675		27,675		335
Consumer installment	518		518		—
Home equity	2,121		2,121		—
Total	$	134,667	$	165,270	$	1,338

	Recorded Investment		Unpaid Principal Balance		Related Valuation Allowance
	(In thousands)
March 31, 2014
Impaired loans with a valuation allowance:
Commercial	$	3,534	$	3,704	$	1,250
Commercial real estate	3,720		3,878		371
Real estate construction	—		—		—
Land development	—		—		—
Residential mortgage	19,944		19,944		444
Subtotal	27,198		27,526		2,065
Impaired loans with no related valuation allowance:
Commercial	38,150		42,914		—
Commercial real estate	49,074		62,207		—
Real estate construction	160		366		—
Land development	4,472		7,773		—
Residential mortgage	6,589		6,589		—
Consumer installment	806		806		—
Home equity	2,046		2,046		—
Subtotal	101,297		122,701		—
Total impaired loans:
Commercial	41,684		46,618		1,250
Commercial real estate	52,794		66,085		371
Real estate construction	160		366		—
Land development	4,472		7,773		—
Residential mortgage	26,533		26,533		444
Consumer installment	806		806		—
Home equity	2,046		2,046		—
Total	$	128,495	$	150,227	$	2,065

The difference between an impaired loan’s recorded investment and the unpaid principal balance for originated loans represents a partial charge-off resulting from a confirmed loss due to the value of the collateral securing the loan being below the loan balance and management’s assessment that full collection of the loan balance is not likely, and for acquired loans that meet the definition of an impaired loan represents fair value adjustments recognized at the acquisition date attributable to expected credit losses and the discounting of expected cash flows at market interest rates. The difference between the recorded investment and the unpaid principal balance of $29.7 million, $30.6 million and $21.7 million at March 31, 2015, December 31, 2014 and March 31, 2014, respectively, includes confirmed losses (partial charge-offs) of $14.8 million, $15.4 million and $17.8 million, respectively, and fair value discount adjustments of $14.9 million, $15.2 million and $3.9 million, respectively.

Impaired loans included $11.2 million, $19.9 million and $11.5 million at March 31, 2015, December 31, 2014 and March 31, 2014, respectively, of acquired loans that were not performing in accordance with original contractual terms. Acquired loans that are not performing in accordance with contractual terms are not reported as nonperforming loans because these loans are recorded in pools at their net realizable value based on the principal and interest the Corporation expects to collect on these loans. Impaired loans also included $46.0 million, $45.7 million and $41.8 million at March 31, 2015, December 31, 2014 and March 31, 2014, respectively, of performing TDRs.

The following schedule presents information related to impaired loans for the three months ended March 31, 2015 and 2014:

	Three Months Ended March 31, 2015
	Average Recorded Investment		Interest Income Recognized While on Impaired Status
	(In thousands)
Commercial	$	38,576	$	289
Commercial real estate	60,240		525
Real estate construction	640		—
Land development	1,875		27
Residential mortgage	27,352		331
Consumer installment	499		—
Home equity	2,352		8
Total	$	131,534	$	1,180

	Three Months Ended March 31, 2014
	Average Recorded Investment		Interest Income Recognized While on Impaired Status
	(In thousands)
Commercial	$	41,607	$	333
Commercial real estate	53,320		361
Real estate construction	167		—
Land development	4,643		37
Residential mortgage	26,781		303
Consumer installment	773		—
Home equity	2,168		—
Total	$	129,459	$	1,034

The following schedule presents the aging status of the recorded investment in loans by classes of loans at March 31, 2015, December 31, 2014 and March 31, 2014:

	31-60 Days Past Due		61-89 Days Past Due		Accruing Loans Past Due 90 Days or More		Non-accrual Loans		Total Past Due		Current		Total Loans
	(In thousands)
March 31, 2015
Originated Portfolio:
Commercial	$	10,121	$	729	$	52	$	18,904	$	29,806	$	1,235,101	$	1,264,907
Commercial real estate	7,238		2,267		148		24,766		34,419		1,237,929		1,272,348
Real estate construction	340		—		—		663		1,003		94,920		95,923
Land development	—		—		—		290		290		3,972		4,262
Residential mortgage	1,246		88		172		6,514		8,020		999,552		1,007,572
Consumer installment	2,143		344		—		433		2,920		832,439		835,359
Home equity	1,728		197		429		1,870		4,224		564,067		568,291
Total	$	22,816	$	3,625	$	801	$	53,440	$	80,682	$	4,967,980	$	5,048,662
Acquired Portfolio:
Commercial	$	59	$	5	$	2,089	$	—	$	2,153	$	89,109	$	91,262
Commercial real estate	1,784		138		6,271		—		8,193		336,382		344,575
Real estate construction	—		—		—		—		—		—		—
Land development	—		—		1,537		—		1,537		7,117		8,654
Residential mortgage	104		—		868		—		972		108,901		109,873
Consumer installment	3		1		11		—		15		8,692		8,707
Home equity	349		234		455		—		1,038		90,103		91,141
Total	$	2,299	$	378	$	11,231	$	—	$	13,908	$	640,304	$	654,212

	31-60 Days Past Due		61-89 Days Past Due		Accruing Loans Past Due 90 Days or More		Non-accrual Loans		Total Past Due		Current		Total Loans
	(In thousands)
December 31, 2014
Originated Portfolio:
Commercial	$	4,033	$	743	$	170	$	16,418	$	21,364	$	1,234,534	$	1,255,898
Commercial real estate	7,515		1,383		—		24,966		33,864		1,170,562		1,204,426
Real estate construction	262		—		—		162		424		138,316		138,740
Land development	—		—		—		225		225		4,303		4,528
Residential mortgage	2,126		54		557		6,706		9,443		988,558		998,001
Consumer installment	3,620		512		—		500		4,632		814,746		819,378
Home equity	3,039		660		1,346		1,667		6,712		562,384		569,096
Total	$	20,595	$	3,352	$	2,073	$	50,644	$	76,664	$	4,913,403	$	4,990,067
Acquired Portfolio:
Commercial	$	133	$	—	$	5,427	$	—	$	5,560	$	93,423	$	98,983
Commercial real estate	2,014		352		11,052		—		13,418		339,804		353,222
Real estate construction	—		—		—		—		—		14,005		14,005
Land development	—		—		1,653		—		1,653		12,569		14,222
Residential mortgage	156		—		18		—		174		112,215		112,389
Consumer installment	55		3		454		—		512		9,680		10,192
Home equity	636		106		1,288		—		2,030		93,120		95,150
Total	$	2,994	$	461	$	19,892	$	—	$	23,347	$	674,816	$	698,163
March 31, 2014
Originated Portfolio:
Commercial	$	6,003	$	1,832	$	43	$	18,251	$	26,129	$	1,104,992	$	1,131,121
Commercial real estate	4,094		1,098		730		27,568		33,490		1,095,228		1,128,718
Real estate construction	18		—		—		160		178		72,227		72,405
Land development	—		—		—		2,267		2,267		5,499		7,766
Residential mortgage	1,259		1,138		—		6,589		8,986		941,815		950,801
Consumer installment	1,950		313		—		806		3,069		670,721		673,790
Home equity	1,500		256		622		2,046		4,424		495,440		499,864
Total	$	14,824	$	4,637	$	1,395	$	57,687	$	78,543	$	4,385,922	$	4,464,465
Acquired Portfolio:
Commercial	$	—	$	—	$	6,496	$	—	$	6,496	$	71,024	$	77,520
Commercial real estate	—		—		2,549		—		2,549		147,900		150,449
Real estate construction	—		—		—		—		—		12,679		12,679
Land development	—		—		2,089		—		2,089		3,906		5,995
Residential mortgage	—		—		58		—		58		11,150		11,208
Consumer installment	49		—		—		—		49		1,573		1,622
Home equity	49		—		331		—		380		28,971		29,351
Total	$	98	$	—	$	11,523	$	—	$	11,621	$	277,203	$	288,824

Loans Modified Under Troubled Debt Restructurings (TDRs)

The following schedule presents the Corporation’s loans reported as TDRs at March 31, 2015, December 31, 2014 and March 31, 2014:

	Performing TDRs		Non-Performing TDRs		Nonaccrual TDRs		Total
	(In thousands)
March 31, 2015
Commercial loan portfolio	$	28,784	$	15,810	$	32,917	$	77,511
Consumer loan portfolio	17,197		2,690		4,426		24,313
Total	$	45,981	$	18,500	$	37,343	$	101,824
December 31, 2014
Commercial loan portfolio	$	29,179	$	15,271	$	32,597	$	77,047
Consumer loan portfolio	16,485		3,196		4,594		24,275
Total	$	45,664	$	18,467	$	37,191	$	101,322
March 31, 2014
Commercial loan portfolio	$	28,123	$	11,218	$	40,511	$	79,852
Consumer loan portfolio	13,700		6,244		3,875		23,819
Total	$	41,823	$	17,462	$	44,386	$	103,671

The following schedule provides information on the Corporation's TDRs that were modified during the three months ended March 31, 2015 and 2014:

	Number of Loans	Pre- Modification Recorded Investment		Post- Modification Recorded Investment
	(Dollars in thousands)
Three Months Ended March 31, 2015
Commercial loan portfolio:
Commercial	5	$	1,932	$	1,932
Commercial real estate	5	2,534		2,534
Land development	—	—		—
Subtotal – commercial loan portfolio	10	4,466		4,466
Consumer loan portfolio	10	336		336
Total	20	$	4,802	$	4,802

Three Months Ended March 31, 2014
Commercial loan portfolio:
Commercial	12	$	8,356	$	8,356
Commercial real estate	9	2,790		2,790
Real estate construction	—	—		—
Land development	1	72		72
Subtotal – commercial loan portfolio	22	11,218		11,218
Consumer loan portfolio	30	987		978
Total	52	$	12,205	$	12,196

The pre-modification and post-modification recorded investment represents amounts as of the date of loan modification. The difference between the pre-modification and post-modification recorded investment of residential mortgage TDRs represents impairment recognized by the Corporation through the provision for loan losses computed based on a loan's post-modification present value of expected future cash flows discounted at the loan's original effective interest rate.

The following schedule includes TDRs for which there was a payment default during the three months ended March 31, 2015 and 2014, whereby the borrower was past due with respect to principal and/or interest for 90 days or more, and the loan became a TDR during the twelve-month period prior to the default:

	Number of Loans	Principal Balance at End of Period
	(Dollars in thousands)
Three Months Ended March 31, 2015
Commercial loan portfolio:
Commercial	—	$	—
Commercial real estate	3	759
Subtotal – commercial loan portfolio	3	759
Consumer loan portfolio	1	33
Total	4	$	792
Three Months Ended March 31, 2014
Commercial loan portfolio:
Commercial	1	$	104
Commercial real estate	2	1,670
Real estate construction	—	—
Land development	—	—
Subtotal – commercial loan portfolio	3	1,774
Consumer loan portfolio	—	—
Total	3	$	1,774

Allowance for Loan Losses

The following schedule presents, by loan portfolio segment, the changes in the allowance for the three months ended March 31, 2015 and details regarding the balance in the allowance and the recorded investment in loans at March 31, 2015 by impairment evaluation method.

	Commercial Loan Portfolio			Consumer Loan Portfolio			Unallocated		Total
	(In thousands)
Changes in allowance for loan losses for the three months ended March 31, 2015:
Beginning balance	$	44,156		$	28,803		$	2,724	$	75,683
Provision for loan losses	3,593			(3,227		)	1,134		1,500
Charge-offs	(1,504		)	(1,639		)	—		(3,143		)
Recoveries	574			642			—		1,216
Ending balance	$	46,819		$	24,579		$	3,858	$	75,256
Allowance for loan losses balance at March 31, 2015 attributable to:
Loans individually evaluated for impairment	$	1,615		$	297		$	—	$	1,912
Loans collectively evaluated for impairment	45,204			24,282			3,858		73,344
Loans acquired with deteriorated credit quality	—			—			—		—
Total	$	46,819		$	24,579		$	3,858	$	75,256
Recorded investment (loan balance) at March 31, 2015:
Loans individually evaluated for impairment	$	89,217		$	19,887		$	—	$	109,104
Loans collectively evaluated for impairment	2,548,223			2,391,335			—		4,939,558
Loans acquired with deteriorated credit quality	444,491			209,721			—		654,212
Total	$	3,081,931		$	2,620,943		$	—	$	5,702,874

The following schedule presents, by loan portfolio segment, details regarding the balance in the allowance and the recorded investment in loans at December 31, 2014 by impairment evaluation method.

	Commercial Loan Portfolio		Consumer Loan Portfolio		Unallocated		Total
	(In thousands)
Allowance for loan losses balance at December 31, 2014 attributable to:
Loans individually evaluated for impairment	$	1,003	$	335	$	—	$	1,338
Loans collectively evaluated for impairment	43,153		27,968		2,724		73,845
Loans acquired with deteriorated credit quality	—		500		—		500
Total	$	44,156	$	28,803	$	2,724	$	75,683
Recorded investment (loan balance) at December 31, 2014:
Loans individually evaluated for impairment	$	86,221	$	19,681	$	—	$	105,902
Loans collectively evaluated for impairment	2,517,371		2,366,794		—		4,884,165
Loans acquired with deteriorated credit quality	480,432		217,731		—		698,163
Total	$	3,084,024	$	2,604,206	$	—	$	5,688,230

The following schedule presents, by loan portfolio segment, the changes in the allowance for the three months ended March 31, 2014 and details regarding the balance in the allowance and the recorded investment in loans at March 31, 2014 by impairment evaluation method.

	Commercial Loan Portfolio			Consumer Loan Portfolio			Unallocated			Total
	(In thousands)
Changes in allowance for loan losses for the three months ended March 31, 2014:
Beginning balance	$	44,482		$	30,145		$	4,445		$	79,072
Provision for loan losses	960			855			(215		)	1,600
Charge-offs	(1,209		)	(2,263		)	—			(3,472		)
Recoveries	777			496			—			1,273
Ending balance	$	45,010		$	29,233		$	4,230		$	78,473
Allowance for loan losses balance at March 31, 2014 attributable to:
Loans individually evaluated for impairment	$	1,621		$	444		$	—		$	2,065
Loans collectively evaluated for impairment	43,389			28,289			4,230			75,908
Loans acquired with deteriorated credit quality	—			500			—			500
Total	$	45,010		$	29,233		$	4,230		$	78,473
Recorded investment (loan balance) at March 31, 2014:
Loans individually evaluated for impairment	$	87,587		$	19,944		$	—		$	107,531
Loans collectively evaluated for impairment	2,252,423			2,104,511			—			4,356,934
Loans acquired with deteriorated credit quality	246,643			42,181			—			288,824
Total	$	2,586,653		$	2,166,636		$	—		$	4,753,289

The allowance attributable to acquired loans of $0.5 million at December 31, 2014 and March 31, 2014 was primarily attributable to two consumer loan pools in the acquired loan portfolio that had a decline in expected cash flows. There were no material changes in expected cash flows for the remaining acquired loan pools at March 31, 2015, December 31, 2014 or March 31, 2014.

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Intangible Assets

3 Months Ended

Mar. 31, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

Intangible Assets

The Corporation has the following types of intangible assets: goodwill, core deposit intangible assets and mortgage servicing rights (MSRs). Goodwill and core deposit intangible assets arose as a result of business combinations or other acquisitions. MSRs arose as a result of selling residential mortgage loans in the secondary market while retaining the right to service these loans and receive servicing income over the life of the loan. Amortization is recorded on the core deposit intangible assets and MSRs. Goodwill is not amortized but is evaluated at least annually for impairment. The Corporation’s most recent annual goodwill impairment test performed as of October 31, 2014 did not indicate that an impairment of goodwill existed. The Corporation also determined that no triggering events have occurred that indicated impairment from the most recent valuation date through March 31, 2015 and that the Corporation's goodwill was not impaired at March 31, 2015.

The following table shows the net carrying value of the Corporation’s intangible assets:

	March 31, 2015		December 31, 2014		March 31, 2014
	(In thousands)
Goodwill	$	180,128	$	180,128	$	120,164
Other intangible assets:
Core deposit intangible assets	$	20,072	$	20,863	$	9,556
Mortgage servicing rights	11,583		12,217		3,316
Total other intangible assets	$	31,655	$	33,080	$	12,872

The following table sets forth the carrying amount, accumulated amortization and amortization expense of core deposit intangible assets that are amortizable and arose from business combinations or other acquisitions:

	March 31, 2015		December 31, 2014		March 31, 2014
	(In thousands)
Gross original amount	$	30,122	$	31,550	$	18,659
Accumulated amortization	10,050		10,687		9,103
Carrying amount	$	20,072	$	20,863	$	9,556
Amortization expense for the three months ended March 31	$	791			$	445

The estimated future amortization expense on core deposit intangible assets for periods ending after March 31, 2015 is as follows: 2015 — $2.4 million; 2016 — $2.9 million; 2017 — $2.6 million; 2018 — $2.5 million; 2019 — $2.4 million; 2020 and thereafter — $7.2 million.

The following shows the net carrying value and fair value of MSRs and the total loans that the Corporation is servicing for others:

	March 31, 2015		December 31, 2014		March 31, 2014
	(In thousands)
Net carrying value of MSRs	$	11,583	$	12,217	$	3,316
Fair value of MSRs	$	14,378	$	14,979	$	6,706
Loans serviced for others that have servicing rights capitalized	$	2,062,544	$	2,093,140	$	877,530

The following table shows the activity for capitalized MSRs:

	Three Months Ended March 31,
	2015			2014
	(In thousands)
Balance at beginning of period	$	12,217		$	3,423
Additions	400			143
Amortization	(1,034		)	(250		)
Balance at end of period	$	11,583		$	3,316

MSRs are stratified into servicing assets originated by the Corporation and those acquired in acquisitions of other institutions and further stratified into relatively homogeneous pools based on products with similar characteristics. There was a valuation allowance of $0.2 million as of March 31, 2015 and December 31, 2014 related to impairment within certain pools attributable to the Corporation's servicing portfolio that was acquired in the Northwestern transaction. There was no impairment valuation allowance recorded on the Corporation's MSRs at March 31, 2014.

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Regulatory Capital

3 Months Ended

Mar. 31, 2015

Banking and Thrift [Abstract]

Regulatory Capital

Regulatory Capital

Federal and state banking regulations place certain restrictions on the transfer of assets, in the form of dividends, loans, or advances, from Chemical Bank to the Corporation. As of March 31, 2015, substantially all of the assets of Chemical Bank were restricted from transfer to the Corporation in the form of loans or advances. Dividends from Chemical Bank are the principal source of funds for the Corporation. At March 31, 2015, Chemical Bank was "well-capitalized" as defined by federal banking regulations. In addition to the statutory limits, the Corporation considers the overall financial and capital position of Chemical Bank prior to making any cash dividend decisions.

The Corporation and Chemical Bank are subject to various regulatory capital requirements administered by federal banking agencies. Under these capital requirements, Chemical Bank must meet specific capital guidelines that involve quantitative measures of assets and certain off-balance sheet items as calculated under regulatory accounting practices. In addition, capital amounts and classifications are subject to qualitative judgments by regulators. Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Corporation’s consolidated financial statements.

Quantitative measures established by regulation to ensure capital adequacy require minimum ratios of Tier 1 capital to average assets (Leverage Ratio) and common equity Tier 1, Tier 1 and Total capital to risk-weighted assets. These capital guidelines assign risk weights to on- and off-balance sheet items in arriving at total risk-weighted assets. Minimum capital levels are based upon the perceived risk of various asset categories and certain off-balance sheet instruments. Risk weighted assets of the Corporation totaled $5.58 billion, $5.70 billion and $4.76 billion at March 31, 2015, December 31, 2014 and March 31, 2014, respectively.

In July 2013, the Federal Reserve Board and FDIC approved final rules implementing the Basel Committee on Banking Supervision's (BCBS) capital guidelines for U.S. banks. The final rules, which are subject to a multi-year phase-in period, began for the Corporation and Chemical Bank on January 1, 2015. The final rules include a new minimum common equity Tier 1 capital to risk-weighted assets (CET) ratio of 4.5%, in addition to raising the minimum ratio of Tier 1 capital to risk-weighted assets from 4.0% to 6.0% and requiring a minimum leverage ratio of 4.0%. The final rules also establish a new capital conservation buffer of 2.5% of risk-weighted assets, which is phased-in over a four-year period beginning January 1, 2016.

At March 31, 2015, December 31, 2014 and March 31, 2014, Chemical Bank’s capital ratios exceeded the quantitative capital ratios required for an institution to be considered “well-capitalized.” Significant factors that may affect capital adequacy include, but are not limited to, a disproportionate growth in assets versus capital and a change in mix or credit quality of assets.

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

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Fair Value Measurements (Textual) (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Fair Value Measurements (Textual) [Abstract]
Impairment of goodwill	$ 0	$ 0	$ 0
Valuation Allowance on Mortgage Servicing Rights	200,000	200,000
Core deposit intangible assets [Member]
Fair Value Measurements (Textual) [Abstract]
Impairment identified for intangible assets	0	0	0
Maximum [Member]
Fair Value Measurements (Textual) [Abstract]
Expected life of intangible assets	15 years
Minimum [Member]
Fair Value Measurements (Textual) [Abstract]
Expected life of intangible assets	10 years
Total Impaired Loans [Member] | Maximum [Member]
Fair Value Measurements (Textual) [Abstract]
Percentage of discount factors used to determine fair value	80.00%
Total Impaired Loans [Member] | Minimum [Member]
Fair Value Measurements (Textual) [Abstract]
Percentage of discount factors used to determine fair value	70.00%
Other Real Estate and Repossessed Assets [Member] | Maximum [Member]
Fair Value Measurements (Textual) [Abstract]
Percentage of discount factors used to determine fair value	75.00%
Other Real Estate and Repossessed Assets [Member] | Minimum [Member]
Fair Value Measurements (Textual) [Abstract]
Percentage of discount factors used to determine fair value	70.00%
Fair Value Measurements Recurring [Member]
Fair Value Measurements (Textual) [Abstract]
Liabilities recorded at fair value	0	0	0
Fair Value Measurements Nonrecurring [Member]
Fair Value Measurements (Textual) [Abstract]
Liabilities recorded at fair value	$ 0	$ 0	$ 0

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Share-Based Compensation (Stock Option Activity) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted average fair value of options granted	$ 8.40
Stock Options [Member] | Non Vested [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning balance, Number of Options	432,199
Granted, Number of Options	244,165
Exercised, Number of Options	0
Vested, Number of Options	(150,224)
Forfeited/expired, Number of Options	(3,049)
Ending balance, Number of Options	523,091
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Beginning balance, Weighted Average Exercise Price	$ 26.75
Granted, Weighted Average Exercise Price	$ 30.18
Exercised, Weighted Average Exercise Price	$ 0.00
Vested, Weighted Average Exercise Price	$ 25.57
Forfeited/expired, Weighted Average Exercise Price	$ 27.42
Ending balance, Weighted Average Exercise Price	$ 28.69
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Grant Date Fair Value [Roll Forward]
Beginning balance, Weighted average grant date fair value	$ 8.30
Weighted average fair value of options granted	$ 8.40
Exercised, Weighted Average Grant Date Fair Value	$ 0.00
Vested, Weighted Average Grant Date Fair Value	$ 7.80
Forfeited/expired, Weighted Average Grant Date Fair Value	$ 8.59
Ending balance, Weighted average grant date fair value	$ 8.49
Stock Options [Member] | Vested & Nonvested [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning balance, Number of Options	1,037,311
Granted, Number of Options	244,165
Exercised, Number of Options	(37,191)
Vested, Number of Options	0
Forfeited/expired, Number of Options	(3,049)
Ending balance, Number of Options	1,241,236
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Beginning balance, Weighted Average Exercise Price	$ 25.90
Granted, Weighted Average Exercise Price	$ 30.18
Exercised, Weighted Average Exercise Price	$ 23.11
Vested, Weighted Average Exercise Price	$ 0.00
Forfeited/expired, Weighted Average Exercise Price	$ 27.42
Ending balance, Weighted Average Exercise Price	$ 26.82
Stock Options [Member] | Vested [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Grant Date Fair Value [Roll Forward]
Exercisable/vested, Number of Options	718,145
Exercisable/vested, Weighted Average Exercise Price	$ 25.46

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Fair Value Measurements (Schedule of Carrying Amounts and Estimated Fair Value of Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Investment securities:
Available-for-sale	$ 680,644	$ 748,864	$ 657,818
Held-to-maturity	380,176	315,740	272,407
Carrying Amount [Member]
Investment securities:
Nonmarketable equity securities	31,249	27,369	25,572
Carrying Amount [Member] | Level 1[Member]
Assets:
Cash and cash equivalents	393,938	183,020	382,385
Investment securities:
Available-for-sale	8,302	8,259	0
Carrying Amount [Member] | Level 2 [Member]
Investment securities:
Available-for-sale	672,342	740,605	657,818
Held-to-maturity	370,950	305,913	267,599
Loans Held-for-sale	9,675	9,128	3,814
Interest receivable	19,816	17,492	16,945
Liabilities:
Deposits without defined maturities	4,988,268	4,741,024	3,868,700
Interest payable	779	755	876
Short-term borrowings	372,236	389,467	361,231
Carrying Amount [Member] | Level 3 [Member]
Investment securities:
Held-to-maturity	10,500	10,500	10,500
Net loans	5,627,618	5,612,547	4,674,816
Liabilities:
Time deposits	1,332,085	1,337,947	1,362,593
Fair Value [Member]
Investment securities:
Nonmarketable equity securities	31,249	27,369	25,572
Fair Value [Member] | Level 1[Member]
Assets:
Cash and cash equivalents	393,938	183,020	382,385
Investment securities:
Available-for-sale	8,302	8,259	0
Fair Value [Member] | Level 2 [Member]
Investment securities:
Available-for-sale	672,342	740,605	657,818
Held-to-maturity	372,876	308,650	265,947
Loans Held-for-sale	9,675	9,128	3,814
Interest receivable	19,816	17,492	16,945
Liabilities:
Deposits without defined maturities	4,988,268	4,741,024	3,868,700
Interest payable	779	755	876
Short-term borrowings	372,236	389,467	361,231
Fair Value [Member] | Level 3 [Member]
Investment securities:
Held-to-maturity	7,300	7,090	6,460
Net loans	5,633,217	5,623,454	4,688,814
Liabilities:
Time deposits	$ 1,335,605	$ 1,340,015	$ 1,371,312

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Acquisitions (Activity for Acquired Loans) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Activity for accretable yield includes contractually due interest of acquired loans
Balance at beginning of period	$ 137,961
Accretable Yield Additions, Net of Reductions	(696)	[1]
Accretion recognized in interest income	(8,205)
Reclassification from nonaccretable difference	0
Balance at end of period	129,060
Northwestern Bancorp [Member]
Activity for accretable yield includes contractually due interest of acquired loans
Balance at beginning of period	104,675
Accretable Yield Additions, Net of Reductions	(1,410)	[1]
Accretion recognized in interest income	(4,998)
Reclassification from nonaccretable difference	0
Balance at end of period	98,267
OAK [Member]
Activity for accretable yield includes contractually due interest of acquired loans
Balance at beginning of period	33,286		32,610
Accretable Yield Additions, Net of Reductions	714	[1]	821	[1]
Accretion recognized in interest income	(3,207)		(3,843)
Reclassification from nonaccretable difference	0		10,000
Balance at end of period	$ 30,793		$ 39,588

[1] Represents additions of estimated contractual interest expected to be collected from acquired loans being renewed or extended, less reductions in contractual interest resulting from the early payoff of acquired loans.

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Loans (Schedule of the Allowance for Loan Losses) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Schedule of allowance and recorded investment related to financing receivables segregated by portfolio segment
Beginning balance	$ 75,683	$ 79,072
Provision for loan losses	1,500	1,600
Charge-offs	(3,143)	(3,472)
Recoveries	1,216	1,273
Ending balance	75,256	78,473
Allowance for loan losses
Loans individually evaluated for impairment related to allowance for loan losses	1,912	2,065	1,338
Loans collectively evaluated for impairment related to allowance for loan losses	73,344	75,908	73,845
Loans acquired with deteriorated credit quality related to allowance for loan losses	0	500	500
Total	75,256	78,473
Loans individually evaluated for impairment related to recorded investment (loan balance)	109,104	107,531	105,902
Loans collectively evaluated for impairment related to recorded investment (loan balance)	4,939,558	4,356,934	4,884,165
Loans acquired with deteriorated credit quality related to recorded investment (loan balance)	654,212	288,824	698,163
Total loans	5,702,874	4,753,289	5,688,230
Commercial Loan Portfolio [Member]
Schedule of allowance and recorded investment related to financing receivables segregated by portfolio segment
Beginning balance	44,156	44,482
Provision for loan losses	3,593	960
Charge-offs	(1,504)	(1,209)
Recoveries	574	777
Ending balance	46,819	45,010
Allowance for loan losses
Loans individually evaluated for impairment related to allowance for loan losses	1,615	1,621	1,003
Loans collectively evaluated for impairment related to allowance for loan losses	45,204	43,389	43,153
Loans acquired with deteriorated credit quality related to allowance for loan losses	0	0	0
Total	46,819	45,010
Loans individually evaluated for impairment related to recorded investment (loan balance)	89,217	87,587	86,221
Loans collectively evaluated for impairment related to recorded investment (loan balance)	2,548,223	2,252,423	2,517,371
Loans acquired with deteriorated credit quality related to recorded investment (loan balance)	444,491	246,643	480,432
Total loans	3,081,931	2,586,653	3,084,024
Consumer Loan Portfolio [Member]
Schedule of allowance and recorded investment related to financing receivables segregated by portfolio segment
Beginning balance	28,803	30,145
Provision for loan losses	(3,227)	855
Charge-offs	(1,639)	(2,263)
Recoveries	642	496
Ending balance	24,579	29,233
Allowance for loan losses
Loans individually evaluated for impairment related to allowance for loan losses	297	444	335
Loans collectively evaluated for impairment related to allowance for loan losses	24,282	28,289	27,968
Loans acquired with deteriorated credit quality related to allowance for loan losses	0	500	500
Total	24,579	29,233
Loans individually evaluated for impairment related to recorded investment (loan balance)	19,887	19,944	19,681
Loans collectively evaluated for impairment related to recorded investment (loan balance)	2,391,335	2,104,511	2,366,794
Loans acquired with deteriorated credit quality related to recorded investment (loan balance)	209,721	42,181	217,731
Total loans	2,620,943	2,166,636	2,604,206
Unallocated [Member]
Schedule of allowance and recorded investment related to financing receivables segregated by portfolio segment
Beginning balance	2,724	4,445
Provision for loan losses	1,134	(215)
Charge-offs	0	0
Recoveries	0	0
Ending balance	3,858	4,230
Allowance for loan losses
Loans individually evaluated for impairment related to allowance for loan losses	0	0	0
Loans collectively evaluated for impairment related to allowance for loan losses	3,858	4,230	2,724
Loans acquired with deteriorated credit quality related to allowance for loan losses	0	0	0
Total	3,858	4,230
Loans individually evaluated for impairment related to recorded investment (loan balance)	0	0	0
Loans collectively evaluated for impairment related to recorded investment (loan balance)	0	0	0
Loans acquired with deteriorated credit quality related to recorded investment (loan balance)	0	0	0
Total loans	$ 0	$ 0	$ 0

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Financial Guarantees

3 Months Ended

Mar. 31, 2015

Guarantees [Abstract]

Financial Guarantees

Financial Guarantees

In the normal course of business, the Corporation is a party to financial instruments containing credit risk that are not required to be reflected in the consolidated statements of financial position. For the Corporation, these financial instruments are financial and performance standby letters of credit. The Corporation has risk management policies to identify, monitor and limit exposure to credit risk. To mitigate credit risk for these financial guarantees, the Corporation generally determines the need for specific covenant, guarantee and collateral requirements on a case-by-case basis, depending on the nature of the financial instrument and the customer’s creditworthiness. At March 31, 2015, December 31, 2014 and March 31, 2014, the Corporation had $38 million, $41 million and $45 million, respectively, of outstanding financial and performance standby letters of credit that expire in five years or less. The majority of these standby letters of credit are collateralized. The Corporation determined that there were no potential losses from standby letters of credit at March 31, 2015, December 31, 2014 and March 31, 2014.

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Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Net carrying value of intangible assets

The following table shows the net carrying value of the Corporation’s intangible assets:

	March 31, 2015		December 31, 2014		March 31, 2014
	(In thousands)
Goodwill	$	180,128	$	180,128	$	120,164
Other intangible assets:
Core deposit intangible assets	$	20,072	$	20,863	$	9,556
Mortgage servicing rights	11,583		12,217		3,316
Total other intangible assets	$	31,655	$	33,080	$	12,872

Carrying amount, accumulated amortization and amortization expense of core deposit intangible assets

The following table sets forth the carrying amount, accumulated amortization and amortization expense of core deposit intangible assets that are amortizable and arose from business combinations or other acquisitions:

	March 31, 2015		December 31, 2014		March 31, 2014
	(In thousands)
Gross original amount	$	30,122	$	31,550	$	18,659
Accumulated amortization	10,050		10,687		9,103
Carrying amount	$	20,072	$	20,863	$	9,556
Amortization expense for the three months ended March 31	$	791			$	445

Net carrying value, fair value of MSRs and loans Corporation servicing for others

The following shows the net carrying value and fair value of MSRs and the total loans that the Corporation is servicing for others:

	March 31, 2015		December 31, 2014		March 31, 2014
	(In thousands)
Net carrying value of MSRs	$	11,583	$	12,217	$	3,316
Fair value of MSRs	$	14,378	$	14,979	$	6,706
Loans serviced for others that have servicing rights capitalized	$	2,062,544	$	2,093,140	$	877,530

Activity for capitalized MSRs

The following table shows the activity for capitalized MSRs:

	Three Months Ended March 31,
	2015			2014
	(In thousands)
Balance at beginning of period	$	12,217		$	3,423
Additions	400			143
Amortization	(1,034		)	(250		)
Balance at end of period	$	11,583		$	3,316

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Loans (Summary of TDRs Modified During the Period) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 Loans	Mar. 31, 2014 Loans
Schedule providing information on TDRs
Modified TDRs, Number of loans	20	52
Modified TDRs, Pre-modification recorded investment	$ 4,802	$ 12,205
Modified TDRs, Post-modification recorded investment	4,802	12,196
Subtotal-commercial loan portfolio [Member] | Commercial Loan Portfolio [Member]
Schedule providing information on TDRs
Modified TDRs, Number of loans	10	22
Modified TDRs, Pre-modification recorded investment	4,466	11,218
Modified TDRs, Post-modification recorded investment	4,466	11,218
Consumer loan portfolio [Member] | Consumer Portfolio Segment [Member]
Schedule providing information on TDRs
Modified TDRs, Number of loans	10	30
Modified TDRs, Pre-modification recorded investment	336	987
Modified TDRs, Post-modification recorded investment	336	978
Commercial [Member] | Commercial Loan Portfolio [Member]
Schedule providing information on TDRs
Modified TDRs, Number of loans	5	12
Modified TDRs, Pre-modification recorded investment	1,932	8,356
Modified TDRs, Post-modification recorded investment	1,932	8,356
Real estate commercial [Member] | Commercial Loan Portfolio [Member]
Schedule providing information on TDRs
Modified TDRs, Number of loans	5	9
Modified TDRs, Pre-modification recorded investment	2,534	2,790
Modified TDRs, Post-modification recorded investment	2,534	2,790
Real Estate Construction Loans [Member] | Commercial Loan Portfolio [Member]
Schedule providing information on TDRs
Modified TDRs, Number of loans		0
Modified TDRs, Pre-modification recorded investment		0
Modified TDRs, Post-modification recorded investment		0
Land development [Member] | Commercial Loan Portfolio [Member]
Schedule providing information on TDRs
Modified TDRs, Number of loans	0	1
Modified TDRs, Pre-modification recorded investment	0	72
Modified TDRs, Post-modification recorded investment	$ 0	$ 72

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Loans (Summary of Loans) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Summary of loans under portfolio
Commercial loan	$ 3,081,931	$ 3,084,024	$ 2,586,653
Consumer loan	2,620,943	2,604,206	2,166,636
Total loans	5,702,874	5,688,230	4,753,289
Commercial [Member]
Summary of loans under portfolio
Commercial loan	1,356,169	1,354,881	1,208,641
Real estate commercial [Member]
Summary of loans under portfolio
Commercial loan	1,616,923	1,557,648	1,279,167
Real estate construction [Member]
Summary of loans under portfolio
Commercial loan	95,923	152,745	85,084
Land development [Member]
Summary of loans under portfolio
Commercial loan	12,916	18,750	13,761
Real estate residential [Member]
Summary of loans under portfolio
Consumer loan	1,117,445	1,110,390	962,009
Consumer installment [Member]
Summary of loans under portfolio
Consumer loan	844,066	829,570	675,412
Home equity [Member]
Summary of loans under portfolio
Consumer loan	$ 659,432	$ 664,246	$ 529,215

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Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Net income	$ 17,835	$ 13,813
Other comprehensive income (loss), net of tax:
Net unrealized gains on investment securities available-for-sale, net of tax expense of $1,262 and $857 for the three months ended March 31, 2015 and 2014, respectively	2,344	1,593
Reclassification adjustment for realized gain on sale of investment securities available-for-sale included in net income, net of tax expense of $203 for the three months ended March 31, 2015	(376)	0
Adjustment for pension and other postretirement benefits, net of tax expense (benefit) of $381 and $(201) for the three months ended March 31, 2015 and 2014, respectively	706	(374)
Total other comprehensive income (loss), net of tax	2,674	1,219
Comprehensive income	$ 20,509	$ 15,032

XML

Significant Accounting Policies

3 Months Ended

Mar. 31, 2015

Accounting Policies [Abstract]

Significant Accounting Policies

Significant Accounting Policies

Nature of Operations

Chemical Financial Corporation (Corporation) operates in a single operating segment — commercial banking. The Corporation is a financial holding company, headquartered in Midland, Michigan, that operated through one commercial bank, Chemical Bank, as of March 31, 2015. Monarch Community Bank was acquired in the April 1, 2015 acquisition of Monarch Community Bancorp, Inc. (Monarch). The Corporation intends to consolidate Monarch Community Bank with and into Chemical Bank during the second quarter of 2015. Chemical Bank operates within the State of Michigan as a state-chartered commercial bank. Chemical Bank operates through an internal organizational structure of four regional banking units and offers a full range of traditional banking and fiduciary products and services to the residents and business customers in the bank’s geographical market areas. The products and services offered by the regional banking units, through branch banking offices, are generally consistent throughout the Corporation, as is the pricing of those products and services. The marketing of products and services throughout the Corporation’s regional banking units is generally uniform, as many of the markets served by the regional banking units overlap. The distribution of products and services is uniform throughout the Corporation’s regional banking units and is achieved primarily through retail branch banking offices, automated teller machines and electronically accessed banking products.

The Corporation’s primary sources of revenue are interest from its loan products and investment securities, service charges and fees from customer deposit accounts and wealth management revenue.

Basis of Presentation

The accompanying unaudited consolidated financial statements of the Corporation and its subsidiaries have been prepared in accordance with U.S. generally accepted accounting principles (GAAP) for interim financial information and the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, the interim consolidated financial statements do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with the Corporation’s consolidated financial statements and footnotes thereto included in the Corporation’s Annual Report on Form 10-K for the year ended December 31, 2014. In the opinion of management, the accompanying unaudited interim consolidated financial statements contain all adjustments believed necessary to present fairly the financial condition and results of operations of the Corporation for the periods presented. Operating results for the three months ended March 31, 2015 are not necessarily indicative of the results that may be expected for the year ending December 31, 2015.

Use of Estimates

Management makes estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying footnotes. Estimates that are particularly susceptible to significant change include the determination of the allowance for loan losses, expected cash flows from acquired loans, fair value amounts related to business combinations, pension expense, income taxes, goodwill impairment and those assets that require fair value measurement. Actual results could differ from these estimates.

Business Combinations

Pursuant to the guidance of ASC Topic 805, Business Combinations (ASC 805), the Corporation recognizes assets acquired, including identified intangible assets, and the liabilities assumed in acquisitions at their fair values as of the acquisition date, with the acquisition-related transaction and restructuring costs expensed in the period incurred.

ASC 805 affords a measurement period beyond the acquisition date that allows the Corporation the opportunity to finalize the acquisition accounting in the event that new information is identified that existed as of the acquisition date but was not known by the Corporation at that time. The Corporation anticipates that measurement period adjustments may arise from adjustments to the fair values of assets and liabilities recognized at the acquisition date for Northwestern Bancorp, Inc. (Northwestern) as additional information is obtained, such as appraisals of collateral securing loans and other borrower information. In the event that a measurement period adjustment is identified, the Corporation will recognize the adjustment as part of its acquisition accounting, which may result in an adjustment to goodwill being recorded.

See Note 2 for further information regarding the Corporation's completed and pending acquisition transactions.

Originated Loans

Originated loans include all of the Corporation's portfolio loans, excluding loans acquired on October 31, 2014 in the acquisition of Northwestern and on April 30, 2010 in the acquisition of O.A.K. Financial Corporation (OAK). Originated loans also include loans acquired as part of the Corporation's branch acquisition on December 7, 2012, as these loans were performing and were considered high-quality loans in accordance with the Corporation's credit underwriting standards at that date. Originated loans are stated at their principal amount outstanding, net of unearned income, charge-offs and unamortized deferred fees and costs. Loan interest income is recognized on the accrual basis. Deferred loan fees and costs are amortized over the loan term based on the level-yield method. Net loan commitment fees are deferred and amortized into fee income on a straight-line basis over the commitment period.

The past due status of a loan is based on the loan’s contractual terms. A loan is placed in nonaccrual status (accrual of interest is discontinued) when principal or interest is past due 90 days or more (except for a loan that is secured by residential real estate, which is transferred to nonaccrual status at 120 days past due), unless the loan is both well-secured and in the process of collection, or earlier when, in the opinion of management, there is sufficient reason to doubt the collectibility of principal or interest. Interest previously accrued, but not collected, is reversed and charged against interest income at the time the loan is placed in nonaccrual status. Subsequent receipts of interest while a loan is in nonaccrual status are recorded as a reduction of principal. Loans are returned to accrual status when principal and interest payments are brought current, payments have been received consistently for a period of time (generally six months) and collectibility is no longer in doubt.

Loans Acquired in a Business Combination

Loans acquired in a business combination (acquired loans) consist of loans acquired on October 31, 2014 in the acquisition of Northwestern and on April 30, 2010 in the acquisition of OAK. Acquired loans were recorded at fair value at the date of acquisition, without a carryover of the associated allowance for loan losses related to these loans, through a fair value discount that was, in part, attributable to deterioration in credit quality. The estimate of expected credit losses was determined based on due diligence performed by executive and senior officers of the Corporation, with assistance from third-party consultants. The fair value discount was recorded as a reduction of the acquired loans’ outstanding principal balances in the consolidated statement of financial position at the acquisition date.

The Corporation accounts for acquired loans, which are recorded at fair value at acquisition, in accordance with Accounting Standards Codification (ASC) Topic 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality (ASC 310-30). ASC 310-30 allows investors to aggregate loans acquired into loan pools that have common risk characteristics and thereby use a composite interest rate and expectation of cash flows expected to be collected for the loan pools. Under the provisions of ASC 310-30, the Corporation aggregated acquired loans into 4 pools in the acquisition of Northwestern and 14 pools in the acquisition of OAK based upon common risk characteristics, including types of loans, commercial type loans with similar risk grades and whether loans were performing or nonperforming. A pool is considered a single unit of accounting for the purposes of applying the guidance prescribed in ASC 310-30. A loan will be removed from a pool of acquired loans only if the loan is sold, foreclosed, paid off or written off, and will be removed from the pool at the carrying value. If an individual loan is removed from a pool of loans, the difference between its relative carrying amount and the cash, fair value of the collateral, or other assets received would not affect the effective yield used to recognize the accretable difference on the remaining pool. The Corporation estimated the cash flows expected to be collected over the life of the pools of loans at acquisition and estimates expected cash flows quarterly thereafter, based on a set of assumptions including expectations as to default rates, prepayment rates and loss severities. The Corporation must make numerous assumptions, interpretations and judgments using internal and third-party credit quality information to determine whether it is probable that the Corporation will be able to collect all contractually required payments. This is a point in time assessment and inherently subjective due to the nature of the available information and judgment involved.

The calculation of the fair value of the acquired loan pools entails estimating the amount and timing of cash flows attributable to both principal and interest expected to be collected on such loan pools and then discounting those cash flows at market interest rates. The excess of a loan pool's expected cash flows at the acquisition date over its estimated fair value is referred to as the "accretable yield," which is recognized into interest income over the estimated remaining life of the loan pool on a level-yield basis. The difference between a loan pool's contractually required principal and interest payments at the acquisition date and the cash flows expected to be collected at the acquisition date is referred to as the "nonaccretable difference," which includes an estimate of future credit losses expected to be incurred over the estimated life of the loan pool and interest payments that are not expected to be collected. Decreases to the expected cash flows in each loan pool in subsequent periods will require the Corporation to record a provision for loan losses. Improvements in expected cash flows in each loan pool in subsequent periods will result in reversing a portion of the nonaccretable difference, which is then classified as part of the accretable yield and subsequently recognized into interest income over the estimated remaining life of the loan pool.

Loans Modified Under Troubled Debt Restructurings

Loans modified under troubled debt restructurings (TDRs) involve granting a concession to a borrower who is experiencing financial difficulty. Concessions generally include modifications to original loan terms, including changes to a loan’s payment schedule or interest rate, which generally would not otherwise be considered. The Corporation’s TDRs include performing and nonperforming TDRs, which consist of originated loans that continue to accrue interest at the loan's original interest rate as the Corporation expects to collect the remaining principal and interest on the loan, and nonaccrual TDRs, which include originated loans that are in a nonaccrual status and are no longer accruing interest, as the Corporation does not expect to collect the full amount of principal and interest owed from the borrower on these loans. At the time of modification (except for loans on nonaccrual status), a TDR is reported as a nonperforming TDR until a six-month payment history of principal and interest payments, in accordance with the terms of the loan modification, is sustained, at which time the Corporation moves the loan to a performing status (performing TDR). If the Corporation does not expect to collect all principal and interest on the loan, the modified loan is classified as a nonaccrual TDR. All TDRs are accounted for as impaired loans and are included in the Corporation’s analysis of the allowance for loan losses. A TDR that has been renewed by a borrower who is no longer experiencing financial difficulty and which yields a market rate of interest at the time of a refinancing is no longer reported as a TDR.

Loans in the Corporation’s commercial loan portfolio (comprised of commercial, commercial real estate, real estate construction and land development loans) that meet the definition of a TDR generally consist of loans where the Corporation has allowed borrowers to defer scheduled principal payments and make interest-only payments for a specified period of time at the stated interest rate of the original loan agreement or reduced payments due to a moderate extension of the loan’s contractual term. If the Corporation does not expect to collect all principal and interest on the loan, the modified loan is classified as a nonaccrual TDR. If the Corporation does not expect to incur a loss on the loan based on its assessment of the borrowers’ expected cash flows, as the pre- and post-modification effective yields are approximately the same, the loan is classified as a nonperforming TDR until a six-month payment history is sustained, at which time the loan is classified as a performing TDR. Since no loss is expected to be incurred on these loans, no additional provision for loan losses has been recognized related to these loans, and these loans accrue interest at their contractual interest rate. These loans are individually evaluated for impairment and transferred to nonaccrual status if they become 90 days past due as to principal or interest payments or if it is probable that any remaining principal and interest payments due on the loan will not be collected in accordance with the modified terms of the loan.

Loans in the Corporation’s consumer loan portfolio (comprised of residential mortgage, consumer installment and home equity loans) that meet the definition of a performing or nonperforming TDR generally consist of residential mortgage loans that include a concession that reduces a borrower’s monthly payments by decreasing the interest rate charged on the loan for a specified period of time (generally 24 months) under a formal modification agreement. The Corporation recognizes an additional provision for loan losses related to impairment on these loans on an individual basis based on the present value of expected future cash flows discounted at the loan’s original effective interest rate. These loans continue to accrue interest at their effective interest rate, which consists of contractual interest under the terms of the modification agreement in addition to an adjustment for the accretion of computed impairment. These loans are moved to nonaccrual status if they become 90 days past due as to principal or interest payments, or sooner if conditions warrant.

Impaired Loans

A loan is defined to be impaired when it is probable that payment of principal and interest will not be paid in accordance with the original contractual terms of the loan agreement. Impaired loans include nonaccrual loans (including nonaccrual TDRs), performing and nonperforming TDRs and acquired loans that were not performing in accordance with original contractual terms. Impaired loans are accounted for at the lower of the present value of expected cash flows discounted at the loan's original effective interest rate or the estimated fair value of the collateral, if the loan is collateral dependent. When the present value of expected cash flows or the fair value of collateral of an impaired loan in the originated loan portfolio is less than the amount of unpaid principal outstanding on the loan, the principal balance of the loan is reduced to its carrying value through either an allocation of the allowance for loan losses or a partial charge-off of the loan balance.

Nonperforming Loans

Nonperforming loans are comprised of loans for which the accrual of interest has been discontinued (nonaccrual loans, including nonaccrual TDRs), accruing originated loans contractually past due 90 days or more as to interest or principal payments and nonperforming TDRs.

Acquired loans that were classified as nonperforming loans prior to being acquired and acquired loans that are not performing in accordance with contractual terms subsequent to acquisition are not classified as nonperforming loans subsequent to acquisition because the loans are recorded in pools at net realizable value based on the principal and interest the Corporation expects to collect on such loans.

Allowance for Loan Losses

The allowance for loan losses (allowance) is presented as a reserve against loans. The allowance represents management’s assessment of probable loan losses inherent in the Corporation’s loan portfolio.

Management’s evaluation of the adequacy of the allowance is based on a continuing review of the loan portfolio, actual loan loss experience, the underlying value of the collateral, risk characteristics of the loan portfolio, the level and composition of nonperforming loans, the financial condition of the borrowers, the balance of the loan portfolio, loan growth, economic conditions, employment levels in the Corporation’s local markets, and special factors affecting specific business sectors. The Corporation maintains formal policies and procedures to monitor and control credit risk. Management evaluates the allowance on a quarterly basis in an effort to ensure the level is appropriate to absorb probable losses inherent in the loan portfolio.

The allowance provides for probable losses that have been identified with specific customer relationships and for probable losses believed to be incurred in the remainder of the originated loan portfolio, but that have not been specifically identified. The Corporation utilizes its own loss experience to estimate inherent losses on loans. Internal risk ratings are assigned to each loan in the commercial loan portfolio (commercial, commercial real estate, real estate construction and land development loans) at the time of origination and are subject to subsequent periodic reviews by senior management. The Corporation performs a detailed credit quality review quarterly on all loans greater than $0.25 million that have deteriorated below certain levels of credit risk, and may allocate a specific portion of the allowance to such loans based upon this review. A portion of the allowance is allocated to the remaining loans by applying projected loss ratios, based on numerous factors. Projected loss ratios incorporate factors such as charge-off experience, trends with respect to adversely risk-rated loans in the commercial loan portfolio, trends with respect to past due and nonaccrual loans, changes in economic conditions and trends, changes in the value of underlying collateral and other credit risk factors. This evaluation involves a high degree of uncertainty.

In determining the allowance and the related provision for loan losses, the Corporation considers four principal elements: (i) valuation allowances based upon probable losses identified during the review of impaired loans in the commercial loan portfolio, (ii) reserves established for adversely-rated loans in the commercial loan portfolio and nonaccrual residential mortgage, consumer installment and home equity loans based on loan loss experience of other adversely-rated loans, (iii) reserves, by loan classes, on all other loans based principally on a five-year historical loan loss experience, with higher weighting placed on the most recent years, loan loss trends giving consideration to estimated loss emergence periods and (iv) an unallocated allowance based on the imprecision in the overall allowance methodology for loans collectively evaluated for impairment.

Although the Corporation allocates portions of the allowance to specific loans and loan types, the entire allowance attributable to originated loans is available for any loan losses that occur in the originated portfolio. Loans that are deemed not collectible are charged off and reduce the allowance. The provision for loan losses and recoveries on loans previously charged off increase the allowance. Collection efforts may continue and recoveries may occur after a loan is charged off.

Acquired loans are aggregated into pools based upon common risk characteristics. An allowance may be recorded related to an acquired loan pool if it experiences a decrease in expected cash flows, as compared to those projected at the acquisition date. On a quarterly basis, the expected future cash flow of each pool is estimated based on various factors, including changes in property values of collateral dependent loans, default rates, loss severities and prepayment speeds. Decreases in estimates of expected cash flows within a pool generally result in a charge to the provision for loan losses and a corresponding increase in the allowance allocated to acquired loans for the particular pool. Increases in estimates of expected cash flows within a pool generally result in a reduction in the allowance allocated to acquired loans for the particular pool, if applicable, and then an adjustment to the accretable yield for the pool, which will increase amounts recognized in interest income in subsequent periods.

Various regulatory agencies, as an integral part of their examination process, periodically review the allowance. Such agencies may require additions to the allowance, based on their judgment, reflecting information available to them at the time of their examinations.

Fair Value Measurements

Fair value for assets and liabilities measured at fair value on a recurring or nonrecurring basis refers to the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants in the market in which the reporting entity transacts such sales or transfers based on the assumptions market participants would use when pricing an asset or liability. Assumptions are developed based on prioritizing information within a fair value hierarchy that gives the highest priority to quoted prices in active markets and the lowest priority to unobservable data, such as the reporting entity’s own data.

The Corporation may choose to measure eligible items at fair value at specified election dates. Unrealized gains and losses on items for which the fair value measurement option has been elected are reported in earnings at each subsequent reporting date. The fair value option (i) may be applied instrument by instrument, with certain exceptions, allowing the Corporation to record identical financial assets and liabilities at fair value or by another measurement basis permitted under GAAP, (ii) is irrevocable (unless a new election date occurs) and (iii) is applied only to entire instruments and not to portions of instruments. At March 31, 2015, December 31, 2014 and March 31, 2014, the Corporation had elected the fair value option on all of its residential mortgage loans held-for-sale. The Corporation has not elected the fair value option for any other financial assets or liabilities.

Share-Based Compensation

The Corporation grants stock options, stock awards, restricted stock performance units and restricted stock service-based units to certain executive and senior management employees. The Corporation accounts for share-based compensation expense using the modified-prospective transition method. Under that method, compensation expense is recognized for stock options based on the estimated grant date fair value as computed using the Black-Scholes option pricing model and the probability of issuance. The Corporation accounts for stock awards based on the closing stock price of the Corporation's common stock on the date of the award. The fair values of both stock options and stock awards are recognized as compensation expense on a straight-line basis over the requisite service period. The Corporation accounts for restricted stock performance units based on the closing stock price of the Corporation's common stock on the date of grant, discounted by the present value of estimated future dividends to be declared over the requisite performance or service period. The fair value of restricted stock performance units is recognized as compensation expense over the expected requisite performance period, or requisite service period for awards with multiple performance and service conditions. The Corporation accounts for restricted stock service-based units based on the closing stock price of the Corporation's common stock on the date of grant, as these awards accrue dividend equivalents equal to the amount of any cash dividends that would have been payable to a shareholder owning the number of shares of the Corporation's common stock represented by the restricted stock service-based units. The fair value of the restricted stock service-based units is recognized as compensation expense over the requisite service period.

Cash flows realized from the tax benefits of exercised stock option awards that result from actual tax deductions that are in excess of the recorded tax benefits related to the compensation expense recognized for those options (excess tax benefits) are classified as financing activities on the consolidated statements of cash flows.

Income and Other Taxes

The Corporation is subject to the income and other tax laws of the United States, the State of Michigan and other states where nexus has been created. These laws are complex and are subject to different interpretations by the taxpayer and the various taxing authorities. In determining the provision for income and other taxes, management must make judgments and estimates about the application of these inherently complex laws, related regulations and case law. In the process of preparing the Corporation’s tax returns, management attempts to make reasonable interpretations of enacted tax laws. These interpretations are subject to challenge by the tax authorities upon audit or to reinterpretation based on management’s ongoing assessment of facts and evolving case law.

On a quarterly basis, management assesses the reasonableness of its effective federal tax rate based upon its estimate of taxable income and the applicable taxes expected for the full year. Deferred tax assets and liabilities are reassessed on a quarterly basis, including the need for a valuation allowance for deferred tax assets.

Uncertain income tax positions are evaluated to determine whether it is more-likely-than-not that a tax position will be sustained upon examination based on the technical merits of the tax position. If a tax position is more-likely-than-not to be sustained, a tax benefit is recognized for the amount that is greater than 50% likely to be realized. Reserves for contingent income tax liabilities attributable to unrecognized tax benefits associated with uncertain tax positions are reviewed quarterly for adequacy based upon developments in tax law and the status of audits or examinations. The Corporation had no contingent income tax liabilities recorded at March 31, 2015, December 31, 2014 or March 31, 2014. The tax periods open to examination by the Internal Revenue Service include the calendar years ended December 31, 2014, 2013, 2012 and 2011.

Investments in Qualified Affordable Housing Projects

The Corporation invests in qualified affordable housing projects solely for the purpose of obtaining tax credits and other tax benefits. Accordingly, the Corporation believes that amortizing its investments in qualified affordable housing projects as a component of income tax expense rather than as a component of operating expenses better reflects the nature and intent of these investments. The Corporation recognized additional income tax expense attributable to the amortization of investments in qualified affordable housing projects of $0.1 million during each of the three months ended March 31, 2015 and 2014. The Corporation's remaining investment in qualified affordable housing projects totaled $4.8 million at March 31, 2015, $4.9 million at December 31, 2014 and$3.2 million atMarch 31, 2014.

Shareholders’ Equity

Common Stock Repurchase Programs

From time to time, the board of directors of the Corporation approves common stock repurchase programs allowing management to repurchase shares of the Corporation’s common stock in the open market. The repurchased shares are available for later reissuance in connection with potential future stock dividends, the Corporation’s dividend reinvestment plan, employee benefit plans and other general corporate purposes. Under these programs, the timing and actual number of shares subject to repurchase are at the discretion of management and are contingent on a number of factors, including the projected parent company cash flow requirements and the Corporation’s market price per share.

In January 2008, the board of directors of the Corporation authorized the repurchase of up to 500,000 shares of the Corporation’s common stock under a stock repurchase program. In November 2011, the board of directors of the Corporation reaffirmed the stock buy-back authorization with the qualification that the shares may only be repurchased if the share price is below the tangible book value per share of the Corporation’s common stock at the time of the repurchase. Since the January 2008 authorization, no shares have been repurchased. At March 31, 2015, there were 500,000 remaining shares available for repurchase under the Corporation’s stock repurchase program.

Underwritten Public Offerings of Common Stock

On June 24, 2014, the Corporation issued and sold 2,500,000 shares of common stock at a public offering price of $28.00 per share. An additional 375,000 shares were issued and sold on June 30, 2014 upon the exercise in full of the underwriters' over-allotment option. The net proceeds from the issuance and sale of the common stock of this $80.5 million offering, after deducting the underwriting discount and issuance-related expenses, totaled $76.2 million.

On September 18, 2013, the Corporation issued and sold 2,213,750 shares of common stock, including 288,750 shares of common stock that were issued and sold upon the exercise in full of the underwriters' over-allotment option, at a public offering price of $26.00 per share. The net proceeds from the issuance and sale of the common stock, after deducting the underwriting discount and issuance-related expenses, totaled $53.9 million.

Shelf Registration

On June 12, 2014, the Corporation filed an automatic shelf registration statement on Form S-3 with the Securities and Exchange Commission (SEC) for an indeterminate amount of securities, which became immediately effective. The shelf registration statement provides the Corporation with the ability to raise capital, subject to SEC rules and limitations, if the board of directors of the Corporation decides to do so.

Preferred Stock

On April 20, 2009, the shareholders of the Corporation authorized the board of directors of the Corporation to issue up to 200,000 shares of preferred stock in connection with either an acquisition by the Corporation of an entity that has shares of preferred stock issued and outstanding pursuant to any program established by the United States government or participation by the Corporation in any program established by the United States government. On April 20, 2015, the shareholders of the Corporation approved an amendment to the restated articles of incorporation which eliminates and replaces the previous class of 200,000 shares of preferred stock with a new class of 2,000,000 shares of preferred stock. At March 31, 2015, no shares of preferred stock were issued and outstanding.

Common Stock

On April 20, 2015, the shareholders of the Corporation approved an amendment to the restated articles of incorporation to increase the number of authorized shares of common stock from 45,000,000 to 60,000,000.

Legal Matters

The Corporation and Chemical Bank are subject to certain legal actions arising in the ordinary course of business. In the opinion of management, after consultation with legal counsel, the ultimate disposition of these matters is not expected to have a material adverse effect on the consolidated financial condition or results of operations of the Corporation.

Adopted Accounting Pronouncements

In-Substance Foreclosures

In January 2014, the FASB issued ASU 2014-04, Receivables—Troubled Debt Restructurings by Creditors (Subtopic 310-40): Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure, a consensus of the FASB Emerging Issues Task Force (ASU 2014-04). ASU 2014-04 clarifies that an in-substance foreclosure occurs, and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either (i) the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure or (ii) the borrower conveying all interest in the residential real estate property to the creditor to satisfy the loan through completion of a deed in lieu of foreclosure or similar legal agreement. ASU 2014-04 also requires disclosure of both the amount of foreclosed residential real estate property held by the creditor and the recorded investment in loans collateralized by residential real estate property that are in the process of foreclosure. ASU 2014-04 is effective for public companies for interim and annual periods beginning after December 15, 2014, with early adoption permitted. Once adopted, an entity can elect either (i) a modified retrospective transition method or (ii) a prospective transition method. The modified retrospective transition method is applied by means of a cumulative-effect adjustment to residential mortgage loans and foreclosed residential real estate properties existing as of the beginning of the period for which the amendments of ASU 2014-04 are effective, with real estate reclassified to loans measured at the carrying value of the real estate at the date of adoption and loans reclassified to real estate measured at the lower of net carrying value of the loan or the fair value of the real estate less costs to sell at the date of adoption. The prospective transition method is applied by means of applying the amendments of ASU 2014-04 to all instances of receiving physical possession of residential real estate properties that occur after the date of adoption. The adoption of ASU 2014-04 on January 1, 2015 did not have a material impact on the Corporation's consolidated financial condition or results of operations.

Share-Based Compensation

In June 2014, the FASB issued ASU 2014-12, Compensation—Stock Compensation (Topic 718): Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period, a consensus of the FASB Emerging Issues Task Force (ASU 2014-12). ASU 2014-12 requires that a performance target that affects vesting of share-based payment awards and that could be achieved after the requisite service period be treated as a performance condition. Compensation cost should be recognized in the period in which it becomes probable that the performance target will be achieved and should represent the compensation cost attributable to the periods for which the requisite service has already been rendered. If the performance target becomes probable of being achieved before the end of the requisite service period, the remaining unrecognized compensation cost should be recognized prospectively over the remaining requisite service period. The total amount of compensation cost recognized during and after the requisite service period should reflect the number of awards that are expected to vest and should be adjusted to reflect those awards that ultimately vest. The requisite service period ends when the employee can cease rendering service and still be eligible to vest in the award if the performance target is achieved. ASU 2014-12 is effective for all entities for interim and annual periods beginning after December 15, 2015, with early adoption permitted. An entity may apply the amendments in ASU 2014-12 either (i) prospectively to all awards granted or modified after the effective date or (ii) retrospectively to all awards with performance targets that are outstanding as of the beginning of the earliest annual period presented in the financial statements and to all new or modified awards thereafter. The Corporation's early adoption of ASU 2014-12 on January 1, 2015 did not have a material impact on the Corporation's consolidated financial condition or results of operations.

Government-Guaranteed Mortgage Loans

In August 2014, the FASB issued ASU 2014-14, Receivables-Troubled Debt Restructurings by Creditors (Subtopic 310-40): Classification of Certain Government Guaranteed Mortgage Loans upon Foreclosure, a consensus of the FASB Emerging Issues Task Force (ASU 2014-14). ASU 2014-14 provides clarifying guidance related to how creditors classify government-guaranteed loans upon foreclosure. Upon foreclosure of a government-guaranteed mortgage loan, the loan should be derecognized and a separate other receivable should be recognized if the following conditions are met: (i) the loan has a government guarantee that is not separable from the loan before foreclosure; (ii) at the time of foreclosure, the creditor has the intent to convey the real estate property to the guarantor and make a claim on the guarantee, and the creditor has the ability to recover under that claim; and (iii) at the time of foreclosure, any amount of the claim that is determined on the basis of the fair value of the real estate is fixed. The separate other receivable should be measured based on the amount of the loan balance (principal and interest) expected to be recovered from the guarantor at the time of foreclosure. ASU 2014-14 is effective for public companies for interim and annual periods beginning after December 15, 2014. An entity should adopt using either the modified retrospective method or the prospective transition method. An entity must apply the same method elected under ASU 2014-04. Early adoption is permitted if the entity has already adopted ASU 2014-04. The adoption of ASU 2014-14 on January 1, 2015 did not have a material impact on the Corporation's consolidated financial condition or results of operations.

Pending Accounting Pronouncements

There are no recent accounting pronouncements that have been issued by the FASB that would have a material impact on the financial statements of the Corporation.

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Accumulated Other Comprehensive Loss (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Components of accumulated other comprehensive loss, net of related tax benefit/expense
Net unrealized gains (losses) on investment securities – available-for-sale, net of related tax expense (benefit) of $946 at March 31, 2015, $(113) at December 31, 2014 and $(478) at March 31, 2014	$ 1,758	$ (210)	$ (887)
Pension and other postretirement benefits adjustment, net of related tax benefit of $16,981 at March 31, 2015, $17,362 at December 31, 2014 and $9,915 at March 31, 2014	(31,537)	(32,243)	(18,414)
Accumulated other comprehensive loss	$ (29,779)	$ (32,453)	$ (19,301)

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(Textual) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Apr. 20, 2015
Share-Based Compensation Plans (Textual) [Abstract]
Share-based compensation expense	$ 0.8	$ 0.6
Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Plans (Textual) [Abstract]
Corporation granted options to purchase restricted stock performance units	76,286
Unrecognized compensation expense	4.1
Unrecognized compensation expense, period for recognition	3 years 0 months 0 days
Restricted Stock Units (RSUs) [Member] | Maximum [Member]
Share-Based Compensation Plans (Textual) [Abstract]
Restricted stock performance units eligible to vest as a multiple of number of units granted	1.5
Restricted Stock Units (RSUs) [Member] | Minimum [Member]
Share-Based Compensation Plans (Textual) [Abstract]
Restricted stock performance units eligible to vest as a multiple of number of units granted	0.25
Equity Option [Member]
Share-Based Compensation Plans (Textual) [Abstract]
Common stock available for future grants under share-based compensation plans	32,953
Weighted-average remaining contractual terms for outstanding stock options	6 years 7 months 6 days
Weighted-average remaining contractual terms for exercisable stock options	4 years 8 months 12 days
Outstanding in-the-money stock options, intrinsic value	5.7
Exercisable in-the-money stock options, intrinsic value	4.4
Closing price of common stock	$ 31.36
Unrecognized compensation expense	$ 4.4
Unrecognized compensation expense, period for recognition	4 years 2 months 11 days
Shareholder Approved Proposal [Member]
Share-Based Compensation Plans (Textual) [Abstract]
Common stock available for future grants under share-based compensation plans			1,300,000

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Accumulated Other Comprehensive Loss (Tables)

3 Months Ended

Mar. 31, 2015

Equity [Abstract]

Components of accumulated other comprehensive loss, net of related tax benefit/expense

The components of accumulated other comprehensive loss, net of related tax benefit/expense, were as follows:

	March 31, 2015			December 31, 2014			March 31, 2014
	(In thousands)
Net unrealized gains (losses) on investment securities – available-for-sale, net of related tax expense (benefit) of $946 at March 31, 2015, $(113) at December 31, 2014 and $(478) at March 31, 2014	$	1,758		$	(210	)	$	(887	)
Pension and other postretirement benefits adjustment, net of related tax benefit of $16,981 at March 31, 2015, $17,362 at December 31, 2014 and $9,915 at March 31, 2014	(31,537		)	(32,243		)	(18,414		)
Accumulated other comprehensive loss	$	(29,779	)	$	(32,453	)	$	(19,301	)

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Investment Securities (Maturities of Debt Securities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Investment Securities Available-for-Sale:
Due in one year or less, Amortized Cost	$ 180,558
Due after one year through five years, Amortized Cost	442,088
Due after five years through ten years, Amortized Cost	50,902
Due after ten years, Amortized Cost	3,003
Preferred stock, Amortized Cost	1,389
Total Available-for-sale Securities, Debt Maturities, Amortized Cost	677,940
Due in one year or less , Fair Value	180,869
Due after one year through five years, Fair Value	443,752
Due after five years through ten years, Fair Value	51,302
Due after ten years, Fair Value	3,029
Preferred stock, Fair Value	1,692
Total Available-for-sale securities, Debt maturities, Fair Value	680,644
Investment Securities Held-to-Maturity:
Due in one year or less, Amortized Cost	35,293
Due after one year through five years, Amortized Cost	171,557
Due after five years through ten years, Amortized Cost	120,799
Due after ten years, Amortized Cost	53,801
Total Held-to-maturity securities, Debt maturities, Amortized Cost	381,450	316,413	278,099
Due in one year or less , Fair Value	35,365
Due after one year through five years, Fair Value	172,699
Due after five years through ten years, Fair Value	122,512
Due after ten years, Fair Value	49,600
Total Held-to-maturity securities, Debt maturities, Fair Value	$ 380,176	$ 315,740	$ 272,407

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Pension and Other Postretirement Benefit Plans

3 Months Ended

Mar. 31, 2015

Compensation and Retirement Disclosure [Abstract]

Pension and Other Postretirement Benefit Plans

Pension and Other Postretirement Benefit Plans

The components of net periodic benefit cost for the Corporation’s qualified and nonqualified pension plans and nonqualified postretirement benefit plan are as follows:

	Three Months Ended March 31,
	2015			2014
	(In thousands)
Defined Benefit Pension Plans
Service cost	$	273		$	250
Interest cost	1,332			1,312
Expected return on plan assets	(2,161		)	(2,078		)
Amortization of prior service credit	(1		)	—
Amortization of unrecognized net loss	1,056			569
Net periodic benefit cost	$	499		$	53
Postretirement Benefit Plan
Service cost	$	4		$	5
Interest cost	33			35
Amortization of prior service cost	32			32
Amortization of unrecognized net gain	—			(26		)
Net periodic benefit cost	$	69		$	46

The Corporation’s pension plan does not have a contribution requirement in 2015. The Corporation did not make a contribution to the pension plan during 2014. The discount rate used to compute the Corporation's pension plan expense for 2015 is 4.15%.

401(k) Savings Plan expense for the Corporation’s match of participants’ base compensation contributions and a 4% of eligible pay contribution to certain employees who are not grandfathered under the pension plan was $1.1 million and $0.8 million for the three months ended March 31, 2015 and 2014, respectively.