U.S. SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

þ	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES AND EXCHANGE ACT OF 1934
	For the quarterly period ended June 30, 2006

o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934

o For the transition period from                                  to                                .

Commission file number: 000-14209

FIRSTBANK CORPORATION

(Exact name of registrant as specified in its charter)

Michigan	38-2633910
(State of Incorporation)	(I.R.S. Employer Identification No.)

311 Woodworth Avenue
Alma, Michigan
(Address of principal executive offices) 48801
(Zip Code)

Registrant’s telephone number, including area code: (989) 463-3131

Securities registered pursuant to Section 12(g) of the Exchange Act:

Common Stock

(Title of Class)

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes o No þ

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Exchange Act.
Yes o No þ interceptions or interference.

Indicate by check mark whether the registrant (1) has filed all reports to be filed by Section 13 or 15(d) of the 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 o

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, or a non-accelerated filer (as defined in Exchange Act Rule 12-b-2).

Large accelerated filer o     Accelerated filer þ      Non-accelerated filer o

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

Common stock outstanding at July 31, 2006: 6,288,716 shares.

INDEX

PART I. FINANCIAL INFORMATION
Item 1. Financial Statements (UNAUDITED)	Page 3
Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations	Page 11
Item 3. Quantitative and Qualitative Disclosures about Market Risk	Page 15
Item 4. Controls and Procedures	Page 16
PART II. OTHER INFORMATION
Item  2. Changes in Securities, Use of Proceeds and Issuer Purchases of Equity Securities	Page 17
Item 4. Submission of Matters to a Vote of Security Holders	Page 17
Item 5. Other Information	Page 17
Item 6. Exhibits	Page 18
SIGNATURES	Page 19
EXHIBIT INDEX	Page 20
Form of Stock Option Agreement 2006 Stock Compensation Plan
Form of Restricted Stock Agreement 2006 Stock Compensation Plan
Certificate of the Chief Executive Officer to Section 302
Certificate of the Chief Financial Officer to Section 302
Certificate of the CEO anf CFO to Section 906

2

Item 1: Financial Statements (UNAUDITED)

FIRSTBANK CORPORATION
CONSOLIDATED BALANCE SHEETS
AS OF JUNE 30, 2006 AND DECEMBER 31, 2005
(Dollars in thousands)
UNAUDITED

	June 30,			December 31,
	2006			2005
ASSETS
Cash and due from banks	$	30,065		$	36,037
Short term investments		4,141			17,295
Total Cash and Cash Equivalents		34,206			53,332
Securities available for sale		68,916			73,811
Federal Home Loan Bank stock		6,506			6,309
Loans held for sale		468			293
Loans, net of allowance for loan losses of $11,621 at June 30, 2006 and $11,559 at December 31, 2005		900,075			867,065
Premises and equipment, net		19,992			19,477
Acquisition goodwill		19,888			19,888
Other intangibles		3,374			3,710
Accrued interest receivable and other assets		18,230			17,233
TOTAL ASSETS	$	1,071,655		$	1,061,118
LIABILITIES AND SHAREHOLDERS’ EQUITY
LIABILITIES
Deposits:
Noninterest bearing accounts	$	130,940		$	130,556
Interest bearing accounts:
Demand		163,988			187,398
Savings		134,691			133,584
Time		380,686			359,567
Total Deposits		810,305			811,105
Securities sold under agreements to repurchase and overnight borrowings		40,452			43,311
Federal Home Loan Bank advances		91,633			83,044
Notes Payable		73			7,590
Subordinated Debentures		20,620			10,310
Accrued interest and other liabilities		13,033			12,181
Total Liabilities		976,116			967,541
SHAREHOLDERS’ EQUITY
Preferred stock; no par value, 300,000 shares authorized, none issued Common Stock; 20,000,000 shares authorized, 6,266,038 shares issued and outstanding ( 6,278,035 at December 31, 2005)		87,276			87,634
Retained earnings		8,734			6,198
Accumulated other comprehensive income/(loss)		(471	)		(255	)
Total Shareholders’ Equity		95,539			93,577
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$	1,071,655		$	1,061,118

See notes to consolidated financial statements.

3

FIRSTBANK CORPORATION
CONSOLIDATED STATEMENTS OF INCOME
JUNE 30, 2006 AND 2005
(Dollars in thousands except per share data)
UNAUDITED

	Three Months Ended June 30,
	2006		2005
Interest Income:
Interest and fees on loans	$	16,688	$	11,353
Securities
Taxable		540		504
Exempt from Federal Income Tax		241		231
Short term investments		76		30
Total Interest Income		17,545		12,118
Interest Expense:
Deposits		5,463		2,617
FHLB advances and other		1,608		1,105
Subordinated Debt		349		132
Total Interest Expense		7,420		3,854
Net Interest Income		10,125		8,264
Provision for loan losses		200		73
Net Interest Income after provision for loan losses		9,925		8,191
Noninterest Income:
Gain on sale of mortgage loans		362		431
Service charges on deposit accounts		1,016		783
Gain on sale of securities		1		17
Mortgage servicing, net of amortization		120		30
Other		1,499		1,336
Total Noninterest Income		2,998		2,597
Noninterest Expense:
Salaries and employee benefits		4,627		3,836
Occupancy and equipment		1,231		969
Amortization of intangibles		168		75
Other		2,718		2,214
Total Noninterest Expense		8,744		7,094
Income before federal income taxes		4,179		3,694
Federal income taxes		1,280		1,186
NET INCOME	$	2,899	$	2,508
Comprehensive Income	$	2,807	$	2,703
Basic Earnings Per Share	$	0.46	$	0.45
Diluted Earnings Per Share	$	0.46	$	0.44
Dividends Per Share	$	0.225	$	0.210

See notes to consolidated financial statements.

4

FIRSTBANK CORPORATION
CONSOLIDATED STATEMENTS OF INCOME
JUNE 30, 2006 AND 2005
(Dollars in thousands except per share data)
UNAUDITED

	Six Months Ended June 30,
	2006		2005
Interest Income:
Interest and fees on loans	$	32,531	$	22,200
Securities
Taxable		1,053		962
Exempt from Federal Income Tax		489		479
Short term investments		187		64
Total Interest Income		34,260		23,705
Interest Expense:
Deposits		10,407		4,860
FHLB advances and other		3,141		2,181
Subordinated Debt		646		252
Total Interest Expense		14,194		7,293
Net Interest Income		20,066		16,412
Provision for loan losses		385		81
Net Interest Income after provision for loan losses		19,681		16,331
Noninterest Income:
Gain on sale of mortgage loans		610		886
Service charges on deposit accounts		1,938		1,503
Gain on sale of securities		7		29
Mortgage servicing, net of amortization		204		78
Other		2,522		2,314
Total Noninterest Income		5,281		4,810
Noninterest Expense:
Salaries and employee benefits		9,185		7,723
Occupancy and equipment		2,503		1,985
Amortization of intangibles		336		151
Other		5,211		4,451
Total Noninterest Expense		17,235		14,310
Income before federal income taxes		7,727		6,831
Federal income taxes		2,404		2,186
NET INCOME	$	5,323	$	4,645
Comprehensive Income	$	5,107	$	4,410
Basic Earnings Per Share	$	0.85	$	0.83
Diluted Earnings Per Share	$	0.84	$	0.81
Dividends Per Share	$	0.445	$	0.410

See notes to consolidated financial statements.

5

FIRSTBANK CORPORATION
CONSOLIDATED STATEMENTS OF CASH FLOW
FOR THE THREE MONTHS ENDED
JUNE 30, 2006 AND 2005
(Dollars in thousands)
UNAUDITED

	Six months ended June 30,
	2006			2005
OPERATING ACTIVITIES
Net income	$	5,323		$	4,645
Adjustments to reconcile net income to net cash provided by operating activities Provision for loan losses		385			81
Depreciation of premises and equipment		1,228			976
Loss on sale of fixed assets		8			0
Net amortization of security premiums/discounts		44			82
Gain on sale of securities		(7	)		(29	)
Amortization of intangibles		336			151
Stock option and stock grant compensation expense		121			0
Gain on sale of mortgage loans		(610	)		(886	)
Proceeds from sales of mortgage loans		26,496			40,396
Loans originated for sale		(26,061	)		(39,074	)
Increase in accrued interest receivable and other assets		(886	)		539
Increase in accrued interest payable and other liabilities		852			1,308
NET CASH PROVIDED BY OPERATING ACTIVITIES		7,229			8,192
INVESTING ACTIVITIES
Proceeds from sale of securities available for sale		0			66
Proceeds from maturities and calls of securities available for sale		17,051			7,168
Purchases of securities available for sale		(12,520	)		(12,971	)
Purchases of FHLB stock		(197	)		(208	)
Net increase in portfolio loans		(33,395	)		(15,039	)
Net purchases of premises and equipment		(1,751	)		(444	)
NET CASH USED IN INVESTING ACTIVITIES		(30,812	)		(21,428	)
FINANCING ACTIVITIES
Net increase/(decrease) in deposits		(800	)		20,587
Decrease in securities sold under agreements to repurchase and other short term borrowings		(2,859	)		(4,726	)
Repayment of notes payable and other borrowings		(7,517	)		(20	)
Repayment of Federal Home Loan Bank borrowings		(5,131	)		(3,354	)
Proceeds from Federal Home Loan Bank borrowings		13,720			8,200
Proceeds from subordinated debentures		10,310			0
Cash proceeds from issuance of common stock		1,437			1,454
Purchase of common stock		(1,916	)		(1,015	)
Cash dividends		(2,787	)		(2,295	)
NET CASH PROVIDED BY FINANCING ACTIVITIES		4,457			18,831
INCREASE/(DECREASE) IN CASH AND CASH EQUIVALENTS		(19,126	)		5,595
Cash and cash equivalents at beginning of period		53,332			25,772
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$	34,206		$	31,367
Supplemental Disclosure
Interest Paid	$	13,705		$	7,003
Income Taxes Paid	$	2,525		$	1,225

See notes to consolidated financial statements.

6

FIRSTBANK CORPORATION
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
JUNE 30, 2006
UNAUDITED

NOTE 1— FINANCIAL STATEMENTS

The accompanying unaudited financial information presented is for Firstbank Corporation (“Corporation”) and its wholly owned subsidiaries: Firstbank — Alma, Firstbank (Mt. Pleasant), Firstbank — West Branch (including its wholly owned subsidiaries; 1^st Armored, Inc., 1^st Title, Inc., and its majority holding in C.A. Hanes Realty Inc. and 1^st Investors Title, LLC), Firstbank — Lakeview, Firstbank — St. Johns, Keystone Community Bank (collectively the “Banks”) and Gladwin Land Company, Inc. The consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by accounting principles generally accepted in the United States of America for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. Operating results for the three and six month periods ended June 30, 2006, are not necessarily indicative of the results that may be expected for the year ending December 31, 2006. The balance sheet at December 31, 2005, has been derived from the audited financial statements at that date. For further information, refer to the consolidated financial statements and footnotes thereto included in the Corporation’s annual report on Form 10-K for the year ended December 31, 2005.

Stock Compensation

The Firstbank Corporation Stock Option Plans of 1993, 1997 and 2006 (“Plans”), as amended, provide for the grant of 377,130, 565,522 and 300,000 shares of stock, respectively, in either restricted form or under option. Options may be either incentive stock options or nonqualified stock options. The Plan of 1993 terminated April 26, 2003. The 1997 Plan will terminate April 28, 2007. The 2006 Plan will terminate February 27, 2016. The Board, at its discretion, may terminate any or all of the Plans prior to the Plans’ termination dates.

Each option granted under the Plans may be exercised in whole or in part during such period as is specified in the option agreement governing that option. Options may only be issued with exercise prices equal to, or greater than, the stock’s market value on the date of issuance. The length of time available for a nonqualified stock option to be exercised is governed by each option agreement, but has not been more than ten years from the grant date.

Statement of Financial Accounting Standards No. 123R requires all public companies to record compensation cost for stock options provided to employees in return for employee service. The cost is measured at the fair value of the options when granted, and this cost is expensed over the employee service period, which is normally the vesting period of the options. This applies to outstanding awards vesting, granted or modified after January 1, 2006. The effect on results of operations will depend on the level of future options grants and the calculation of the fair value of the options grated at such future date, as well as the vesting periods provided, and so cannot currently be predicted. Existing options that will vest after adoption date are expected to result in additional compensation expense of approximately $214,000 in 2006, $100,000 in 2007, $53,000 in 2008, and $23,000 in 2009 and $7,000 in 2010.

Beginning with the first quarter of 2006 stock-based compensation cost is reflected in net income using the fair value method, as required by Statement of Financial Accounting Standards No. 123R - Share based Payments. Prior to the first quarter of 2006, stock-based compensation cost was reflected as a footnote adjustment to net income, as allowed by FASB Statement No. 123, Accounting for Stock-Based Compensation. All options granted had an exercise price equal to or greater than the market price of the underlying common stock at date of grant. There were no grants of stock options in the first two quarter of 2006, or 2005.

7

Activity under the plans:

	Six months ended June 30, 2006
	Total options outstanding
				Weighted		Weighted
				Average		Average Fair
	Shares			Exercise Price		Value
Options outstanding, beginning of period		448,568		$	20.23	$	2.86
Granted		0			—		—
Exercised		(22,737	)	$	14.36	$	8.73
Forfeited		(2,885	)	$	25.93		—
Options outstanding, end of period		422,946		$	20.50	$	2.59
Options exercisable, end of period		275,366		$	18.58	$	4.51

The aggregate intrinsic value of all options outstanding at June 30,2006 was $1.5 million. The aggregate intrinsic value of all options that were exercisable at June 30, 2006 was $1.4 million.

Proceeds, related tax benefits realized from options exercised and intrinsic value of options exercised were as follows:

	Six months ended June 30,
(dollars in thousands)	2006		2005
Proceeds of options exercised	$	327	$	406
Related tax benefit recognized	$	111	$	138
Intrinsic value of options exercised	$	198	$	306

Options outstanding at June 30, 2006 were as follows:

	Options outstanding						Exercisable
			Weighted		Weighted				Weighted
			Average		Average				Average
			Exercise		Contractual				Exercise
Range of exercise prices	Shares		Price		Life (years)		Shares		Price
$4.92  –  $12.00		10,028	$	9.87		0.60		10,028	$	9.87
$12.01 – $16.00		119,819	$	14.63		3.82		112,066	$	14.66
$16.01 – $21.00		69,652	$	18.76		5.36		53,516	$	18.34
$21.01 –   27.49		223,447	$	24.68		6.98		99,756	$	23.99
Total		422,946	$	20.50		5.67		275,366	$	18.58

The following table illustrates the effect on net income and earnings per share if expense was measured using the fair value recognition provisions of FASB Statement No. 123, Accounting for Stock-Based Compensation.

Periods ended June 30, 2005
(Dollars in thousands except per share data)	Three months		Six months
Net Income as Reported	$	2,508	$	4,645
Less: Value Determined Under Fair Value Based Method (net of taxes)		47		93
Amount Expensed in the Period (net of taxes)		0		0
Pro Forma Net Income	$	2,461	$	4,552
Basic Earnings per Share as Reported	$	0.45	$	0.83
Pro Forma Basic Earnings per Share	$	0.44	$	0.81
Diluted Earnings per Share as Reported	$	0.44	$	0.82
Pro Forma Diluted Earnings per Share	$	0.43	$	0.80

8

Newly Issued, Not Yet Effective Accounting Standard

In June 2006, the FASB issued Interpretation No. 48, Accounting for Uncertainty in Income Taxes — an Interpretation of FASB Statement No. 109 (FIN 48), which clarifies the accounting for uncertainty in income taxes recognized in a company’s financial statements in accordance with SFAS 109, Accounting for Income Taxes. FIN 48 prescribes a recognition and measurement threshold for a tax position taken or expected to be taken in a tax return. FIN 48 also provides guidance on derecognition, classification, interest and penalties, accounting in interim periods, disclosure, and transition. FIN 48 is effective for fiscal years beginning after December 15, 2006. The Company has not completed its evaluation of the impact of the adoption of FIN 48.

NOTE 2 — NONPERFORMING LOANS AND ASSETS

Nonperforming Loans and Assets

The following table summarizes nonaccrual and past due loans at the dates indicated:

(Dollars in thousands)

	June 30,			December 31,
	2006			2005
Nonperforming loans:
Nonaccrual loans	$	5,877		$	4,770
Loans 90 days or more past due		1,504			2,440
Renegotiated loans		0			0
Total nonperforming loans	$	7,381		$	7,210
Property from defaulted loans	$	1,351		$	1,020
Nonperforming loans as a percent of total loans*		0.81	%		0.82	%
Nonperforming loans plus Other Real Estate as a percent of total loans* plus Other Real Estate		0.98	%		0.94	%
Nonperforming assets as a percent of total assets		0.82	%		0.78	%

Analysis of the Allowance for Loan Losses

(Dollars in Thousands)

	Three months ended						Six months ended
	June 30,						June 30,
	2006			2005			2006			2005
Balance at beginning of period	$	11,562		$	10,127		$	11,559		$	10,581
Charge-offs		(221	)		(210	)		(514	)		(886	)
Recoveries		80			104			191			319
Net charge-offs		(141	)		(106	)		(323	)		(568	)
Provision for loan losses		200			73			385			81
Balance at end of period	$	11,621		$	10,094		$	11,621		$	10,094
Average total loans* outstanding during the period	$	900,802		$	678,835		$	892,200		$	674,539
Allowance for loan loss as a percent of total loans*		1.27	%		1.47	%		1.27	%		1.47	%
Allowance for loan loss as a percent of nonperforming loans		157	%		356	%		157	%		356	%
Net Charge-offs^ as a percent of average loans*		0.06	%		0.06	%		0.07	%		0.17	%

*	All loan ratios exclude loans held for sale
^	Annualized

9

NOTE 3 — BASIC AND DILUTED EARNINGS PER SHARE

	Three Months Ended				Six Months Ended
	June 30,				June 30,
(Dollars in Thousands Except per Share Data)	2006		2005		2006		2005
Earnings per share
Net income	$	2,899	$	2,508	$	5,323	$	4,645
Weighted average common shares outstanding		6,271		5,602		6,271		5,598
Basic Earnings per Share	$	0.46	$	0.45	$	0.85	$	0.83
Earnings per share assuming dilution
Net income	$	2,899	$	2,508	$	5,323	$	4,645
Weighted average common shares outstanding		6,271		5,602		6,271		5,598
Add dilutive effect of assumed exercises of options		37		95		37		105
Weighted average common and dilutive potential common shares outstanding		6,308		5,697		6,308		5,703
Diluted Earnings per Share	$	0.46	$	0.44	$	0.84	$	0.81

Stock options for 109,098 shares for the three and six month periods of 2005, and 169,031 shares for the three and six month and periods of 2006, were not considered in computing diluted earnings per share because they were antidilutive.

10

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

The consolidated financial information presented is for Firstbank Corporation (“Corporation”) and its wholly owned subsidiaries; Firstbank — Alma, Firstbank (Mt. Pleasant), Firstbank — West Branch (including its wholly owned subsidiaries; 1^st Armored, Inc., 1^st Title, Inc. and its majority holding in C.A. Hanes Realty, Inc. and 1^st Investors Title, LLC), Firstbank — Lakeview, Firstbank — St. Johns, Keystone Community Bank (collectively the “Banks”) and Gladwin Land Company, Inc.

Subsequent events

The Corporation signed an agreement to sell a its Gladwin Land appraisal business in its continuing efforts to reduce under-productive expenses. The sale closed on August 1, and will not have a material impact on earnings in the third quarter.

Financial Condition

Total assets increased $10.5 million, or 1.0%, during the first six months of 2006. Cash and cash equivalents decreased $19.1 million, or 35.9%. Securities available for sale were lower, decreasing $4.9 million, or 6.6%, from December 31, 2005.

Total portfolio loans increased $33.1 million, or 3.8%, during the first six months of 2006. Average total loans were 3.7% higher in the second quarter of 2006 when compared with the fourth quarter of 2005. Residential mortgages were $9.8 million, or 3.6% higher, mainly due to new loans which were retained for the loan portfolio because of their specific rate and collateral characteristics. Real estate construction loans increased $6.9 million, or 11.2%. Commercial and commercial real estate loans were also higher, increasing $13.4 million, or 7.3%, from December 31, 2005.

Net charge-offs of loans were $323,000 in the first six months of 2006 compared to $568,000 in the first six months of 2005. The lower level of charge-offs this year was primarily due to the charge off of a single commercial loan in early 2005 which had been previously identified as a problem loan and had a specific allowance allocation. The year-to-date ratio of net charge-offs of loans (annualized) to average loans was 0.07% in 2006 compared to 0.17% in the same period of 2005. During the first two quarters of 2005, favorable developments and pay downs relating to a small number of problem credits allowed the Corporation to keep its provision expense low, at $81,000. Provision expense in the first half of 2006 was $385,000, as the Corporation provided additional reserves for loans which show increasing signs of weakness, growth in its loan portfolios, and for charged off loans that were not specifically reserved for in the remainder of the portfolio.

Non-performing loans as a percent of total loans was 0.81% at June 30, 2006, compared with 0.82% at year end 2005. Nonperforming loans were at a similar level as 2005 year end, but continue to run higher than the year ago period, primarily due to a single credit which was placed into nonaccrual status in the fourth quarter of 2005, as previously disclosed.

At June 30, 2006, the allowance as a percentage of average outstanding loans was 1.27% compared with 1.47% at the same point a year earlier. Management continues to maintain the allowance for loan losses at a level considered adequate to cover losses within the loan portfolio. The allowance balance is established after considering past loan loss experience, current economic conditions, composition of the loan portfolio, delinquencies, and other relevant factors.

Total core deposits increased $13.1 million or 1.8%, during the six months of 2006. Increases of $35.2 million, or 12.8%, in time deposits and $986,000 in savings deposits more than offset seasonal declines in interest bearing demand deposits of $23.4 million, or 12.5%. Wholesale CD’s decreased of $13.9 million or 16.6%. Non-interest bearing demand deposits grew by $384,000, or 0.3% from year end levels.

For the six month period ended June 30, 2006, securities sold under agreements to repurchase and overnight borrowings decreased $2.9 million, or 6.6%, due to normal fluctuations in customer cash flows and less reliance on overnight borrowing. Federal Home Loan Bank advances and notes payable increased $1.1 million compared with year end 2005. The Corporation issued $10.3 million of subordinated debt in January of this

11

year through a special purpose trust which was formed to issue trust preferred securities. This method of issuing debt provides the Corporation with additional funding as well as providing it with regulatory capital. The subordinated debt carries a rate of 6.049% for five years, at which time it converts to the current 90 day LIBOR rate plus 1.27%.

Total shareholders’ equity increased $2.0 million, or 2.1%, during the first six months of 2006. Net income of $5.3 million and stock issuances of $1.4 million increased shareholders’ equity, while stock repurchases of $1,916,000 and dividends of $2.8 million decreased shareholders’ equity. Stock issuance was primarily related to dividend reinvestment and exercise of stock options. The per share book value of shareholders’ equity was $15.25 at June 30, 2006, increasing 2.3% from $14.91 at December 31, 2005.

The following table discloses compliance with current regulatory capital requirements on a consolidated basis:

							Total Risk-
				Tier 1			Based
(Dollars in Thousands)	Leverage			Capital			Capital
Capital Balances at June 30, 2006	$	93,465		$	93,465		$	103,920
Required Regulatory Capital	$	41,757		$	35,477		$	70,954
Capital in Excess of Regulatory Minimums	$	51,708		$	57,988		$	32,966
Capital Ratios at June 30, 2006		8.95	%		10.54	%		11.72	%
Regulatory Capital Ratios — Minimum Requirement		4.00	%		4.00	%		8.00	%

Results of Operations

Three Months Ended June 30, 2006

For the second quarter of 2006, net income was $2,899,000, basic and diluted earnings per share were $0.46, compared to $2,508,000, $0.45, and $0.44 for the second quarter of 2005. Included in second quarter 2006 earnings is a gain on the sale of a 45% minority interest in the company’s title insurance subsidiary of $274,000 or $0.03 per share. The comparison of this year’s second quarter to last year is also effected by the addition of Keystone Community Bank through the acquisition of Keystone Financial Corporation, completed on October 1, 2005.

Average earning assets increased $214.8 million, or 28.0%, from the second quarter of 2005 to the same period of 2006. The yield on earning assets increased 83 basis points, to 7.24%, for the quarter ended June 30, 2006, compared to 6.41% for the quarter ended June 30, 2005. The cost of funding related liabilities also increased, rising 102 basis points when comparing the three month periods ended June 30th, from 2.01% in 2005, to 3.03% in 2006. Since the increase in yield on earning assets was less than the increase in the cost of funds relative to earning assets, the net interest margin decreased by 19 basis points, from 4.40% in 2005 to 4.21% in 2006. This year’s second quarter net interest margin, as compared to the prior year, was negatively impacted by six basis points due to the cost of funding the cash portion of the purchase consideration for the Keystone acquisition. Net interest income increased $1.9 million to $10.1 million in the second quarter of 2006 compared with the same period of 2005.

The provision for loan losses increased $127,000, when the second quarter of 2006 is compared to the same quarter of 2005. In the second quarter of 2005, the Corporation was able to provide just $73,000 to its allowance for loan loss reserve as a result of pay offs and pay downs of loans with established specific reserves. The second quarter of 2006 provision for loan loss was at a more normal level of $200,000. Net charge-offs for the second quarter of 2006 increased by $35,000 to $141,000, when compared to $106,000 in the same period of 2005. Management has developed a quantitative and qualitative methodology for analyzing factors which impact the allowance for loan losses consistently across its five banking subsidiaries. The process applies risk factors for historical charge-offs and delinquency experience, portfolio segment growth rates, and industry and regional factors and trends as they affect the banks’ portfolios. The consideration of exposures to industries most affected by current risks in the economic and political environment and the

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review of risks in certain credits that are not considered part of the non-performing loan category contributed to the establishment of the allowance levels at each bank.

Total non-interest income increased $401,000, or 15.4%, when the second quarter of 2006 is compared to the same period in 2005. The 2006 second quarter includes the $274,000 gain on the sale of a minority interest in the company’s title insurance subsidiary mentioned previously. Service charges on deposit accounts for the three month period ended June 30, 2006 were $233,000, or 22.9%, higher than the same period of 2005. Mortgage origination activity that occurred in the second quarter of 2005 resulted in a higher level of mortgage gains than occurred in this year’s second quarter. With interest rates moving higher throughout the last twelve months, the second quarter of 2006 saw minimal re-finance activity resulting in mortgage gains of just $362,000, a decrease of $69,000, or 19.1%, compared with the same period in 2005. Mortgage servicing income on the other hand increased $90,000 as a result of fewer prepayments on serviced mortgages. Other non-interest income, which includes the gain on the sale of a minority interest in the company’s title insurance subsidiary mentioned above, increased $163,000 when the second quarter of 2006 is compared with the same period of 2005.

Total non-interest expense increased $1.7 million, or 19.3%, when comparing the three month periods ended June 30, 2006 and 2005. Salaries and employee benefits were $791,000 higher than the 2005 level. Occupancy and equipment costs increased $262,000, or 21.3%, from the prior year’s second quarter. Amortization of intangibles was $93,000 higher than the previous year, increasing to $168,000 for the second quarter. Other miscellaneous non-interest expense increased $497,000, or 22.4%, when the second quarter of 2006 is compared to the same period of 2005. The increases in these four categories were primarily a result of the inclusion of Keystone’s cost in this year’s second quarter.

Federal Income tax expense increased $94,000, or 7.4%, reflecting increased taxes as a result of higher earnings. In the second quarter of 2006, Management reviewed its tax asset and liability accounts in order to reassess previous estimates of contingent tax positions. As a result of this review, the Corporation’s accrual rate for federal income tax was lowered to achieve its full year target effective tax rate.

Six Months Ended June 30, 2006

For first six months of 2006, net income was $5,323,000, basic earnings per share were $0.85, and diluted earnings per share were $0.84, compared to $4,645,000, $0.83, and $0.81 for the first six months of 2005. Include in the 2006 results is a gain on the sale of a 45% minority interest in the company’s title insurance subsidiary of $274,000 or $0.03 per share. The comparison of this year’s first half to last year is also effected by the addition of Keystone Community Bank through the acquisition of Keystone Financial Corporation, completed on October 1, 2005.

Average earning assets increased $216.9 million, or 28.4%, from the half of 2005 to the same period of 2006. The yield on earning assets increased 78 basis points, to 7.12%, for the period ended June 30, 2006, compared to 6.34% for the first half of 2005. The cost of funding related liabilities also increased, rising 99 basis points when comparing the six month periods ended June 30th, from 1.93% in 2005, to 2.92% in 2006. Since the increase in yield on earning assets was less than the increase in the cost of funds relative to earning assets, the net interest margin decreased by 22 basis points, from 4.42% in 2005 to 4.20% in 2006. This year’s year-to-date net interest margin, as compared to the prior year, was negatively impacted by six basis points due to the cost of funding the cash portion of the purchase consideration for the Keystone acquisition. Net interest income increased $3.7 million to $20.1 million in the first half of 2006 compared with the same period of 2005.

The provision for loan losses increased $304,000, when the first six months of 2006 is compared to the same period of 2005. In the first half of 2005, the Corporation was able to provide just $81,000 to its allowance for loan loss reserve as a result of pay offs and pay downs of loans with established specific reserves. For the first six months of 2006, provision for loan loss was at a more normal level of $385,000, roughly offsetting net charge offs of $323,000. Net charge-offs for the first six months of 2005 were $568,000, which included one large charge off, for which specific allowance allocations had been previously established. Management has developed a quantitative and qualitative methodology for analyzing factors which impact the allowance for loan losses consistently across its five banking subsidiaries. The process applies risk factors for historical charge-offs and delinquency experience, portfolio segment growth rates, and industry and regional factors and trends as they affect the banks’ portfolios. The consideration of exposures to industries most affected by

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current risks in the economic and political environment and the review of risks in certain credits that are not considered part of the non-performing loan category contributed to the establishment of the allowance levels at each bank.

Total non-interest income increased $471,000, or 9.8%, when year-to-date 2006 is compared to the same period in 2005. The 2006 results include the $274,000 gain on the sale of a minority interest in the company’s title insurance subsidiary previously mentioned. Excluding the gain, non-interest income would have increased $197,000 or 4.1%. Service charges on deposit accounts for the six month period ended June 30, 2006 were $435,000, or 28.9%, higher than the same period of 2005. Mortgage origination activity that occurred in the first half of 2005 resulted in a higher level of mortgage gains than occurred in the current year. With interest rates moving higher throughout the last twelve months, the first half of 2006 saw minimal re-finance activity resulting in mortgage gains of $610,000, a decrease of $276,000, or 31.2%, compared with the same period in 2005. Mortgage servicing income on the other hand increased $126,000 as a result of fewer prepayments on serviced mortgages. Other non-interest income, which includes the $274,000 gain on the sale of a minority interest in the company’s title insurance subsidiary mentioned above, increased $208,000 when the first six months of 2006 are compared with the same period of 2005.

Total non-interest expense increased $2.9 million, or 20.4%, when comparing the six month periods ended June 30, 2006 and 2005. Salaries and employee benefits were $1.5 million higher than the 2005 level. Occupancy and equipment costs increased $518,000, or 26.1%, from the prior year. Amortization of intangibles was $185,000 higher than the previous year, increasing to $336,000 for the year. Other miscellaneous non-interest expense increased $749,000, or 17.0%, when the six months of 2006 are compared to the same period of 2005. The increases in these four categories were primarily a result of the inclusion of Keystone’s cost in this year’s first six months.

Federal Income tax expense increased $218,000, or 14.6%, reflecting increased taxes as a result of higher earnings. In the second quarter of 2006, Management reviewed its tax asset and liability accounts in order to reassess previous estimates of contingent tax positions. As a result of this review, the Corporation’s accrual rate for federal income tax was lowered to achieve its full year target effective tax rate.

Contractual Obligations, Commitments, Contingent Liabilities, and Off-Balance Sheet Arrangements

The Corporation has various financial obligations, including contractual obligations and commitments that may require future cash payments. Management believes that there have been no material changes in the Corporation’s overall level of these financial obligations since December 31, 2005 and that any changes in the Corporation’s obligations which have occurred are routine for the industry. Further discussion of the nature of each type of obligation is included in Managements Discussion and Analysis on pages 13 and 14 of the Corporation’s Form 10K Annual Report, and is incorporated herein by reference.

Critical Accounting Policies

Certain of the Corporation’s accounting policies are important to the portrayal of the Corporation’s financial condition, since they require management to make difficult, complex or subjective judgments, some of which may relate to matters that are inherently uncertain. Estimates associated with these policies are susceptible to material changes as a result of changes in facts and circumstances. Facts and circumstances which could affect these judgments include, but without limitation, changes in interest rate, in local and national economic conditions, or the financial condition of borrowers. Management believes that its critical accounting policies include determining the allowance for loan losses, determining the fair value of securities and other financial instruments, the valuation of mortgage servicing rights, determination of purchase accounting adjustments, and estimating state and federal contingent tax liabilities. The Corporation’s significant accounting policies are discussed in detail in Managements Discussion and Analysis on pages 14 through 16 in the Corporation’s annual report to shareholders for the year ended December 31, 2005.

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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 about the Corporation itself. Words such as “anticipate,” “believe,” “determine,” “estimate,” “expect,” “forecast,” “intend,” “is likely,” “plan,” “project,” “opinion,” variations of such terms, and similar expressions are intended to identify such forward-looking statements. The presentations and discussions of the provision and allowance for loan losses, and determinations as to the need for other allowances presented in this report are inherently forward-looking statements in that they involve judgments and statements of belief as to the outcome of future events. These statements are not guarantees of future performance and involve certain risks, uncertainties, and assumptions 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. Internal and external factors that may cause such a difference include changes in interest rates and interest rate relationships; demand for products and services; the degree of competition by traditional and non-traditional competitors; changes in banking regulations; changes in tax laws; changes in prices, levies, and assessments; the impact of technological advances; governmental and regulatory policy changes; the outcomes of pending and future litigation and contingencies; trends in customer behavior and customer ability to repay loans; software failure, errors or miscalculations; and the vicissitudes of the national economy. The Corporation undertakes no obligation to update, amend or clarify forward-looking statements, whether as a result of new information, future events, or otherwise.

Item 3. Quantitative and Qualitative Disclosures about Market Risk

Information under the headings, “Liquidity and Interest Rate Sensitivity” on pages 12 and 13 and “Quantitative and Qualitative Disclosure About Market Risk” on pages 16 and 17 in the registrant’s annual report to shareholders for the year ended December 31, 2005, is here incorporated by reference. Firstbank’s annual report is filed as Exhibit 13 to its Form 10-K annual report for its fiscal year ended December 31, 2005.

Firstbank faces market risk to the extent that both earnings and the fair values of its financial instruments are affected by changes in interest rates. The Corporation manages this risk with static GAP analysis and simulation modeling. While commercial customer preferences have begun to shift from variable rate to fixed rate loans, the Corporation does not believe that there has been a material change in the nature of the Corporation’s primary market risk exposures, including the categories of market risk to which the Corporation is exposed and the particular markets that present the primary risk of loss to the Corporation. As of the date of this Form 10-Q Quarterly Report, the Corporation does not know of nor 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 exposures, as described in the sections of its Form 10-K Annual Report incorporated by reference in response to this item, have not changed materially during the current year. As of the date of this Form 10-Q quarterly report, the Corporation does not expect to change those methods in the near term. However, 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 in the future will be primarily determined by market, economic, and geopolitical factors which are outside of Firstbank’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” of this Form 10-Q quarterly report for a discussion of the limitations on Firstbank’s responsibility for such statements.

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Item 4. Controls and Procedures

a)	Evaluation of Disclosure Controls and Procedures
	On August 7, 2006, the Corporation’s Chief Executive Officer and Chief Financial Officer reported on the Corporation’s disclosure controls and procedures (as defined in Exchange Act Rule 13a-15(e) and 15d-15(e)) to the Audit Committee. The portion of that report which constitutes their conclusions about the effectiveness of the disclosure controls and procedures based on their evaluation as of June 30, 2006 is as follows: “Based on our knowledge and the most recent evaluation, we believe the disclosure controls and procedures to be reasonably effective and commercially practical in providing information for management of the Corporation and for fair reporting to the investing public.”
b)	Changes in Internal Controls
	During the period covered by this report, there have been no changes in the Corporation’s internal control over financial reporting that have materially affected or are reasonably likely to materially affect the Corporation’s internal control over financial reporting.

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PART II. OTHER INFORMATION

Item 2. Changes in Securities, Use of Proceeds and Issuer Purchases of Equity Securities

On November 25, 2003, the Corporation announced a repurchase plan that authorized share repurchases of up to $10 million of Firstbank Corporation common stock. As of December 31, 2003, the Corporation repurchased 8,000 shares of its stock at an average price of $32.21 under the authorization. During 2004 the Company repurchased 106,700 shares of its common stock for an average cost per share of $29.95. During 2005, the Corporation repurchased 37,200 shares of its common stock for an average cost per share of $27.27.

In the first quarter of 2006, the Corporation repurchased 24,500 shares of its common stock in open market transactions under the November 2003 repurchase plan. The shares were purchased at an average price of $23.23 per share. During the second quarter of 2006, the corporation repurchased 57,000 shares of its common stock in open market transactions at an average cost of $23.61. The Corporation has remaining authority to repurchase up to $3,616,068 of market value of its common stock under the November 2003 repurchase plan.

ISSUER PURCHASES OF EQUITY SECURITIES

							Maximum
					Total Number of		Approximate
					Shares Purchased as		Dollar Value of
					a Part of Publicly		Shares that May yet
	Total Number		Average Price		Announced Plans		Be Purchased Under
Period	of Shares Purchased		Paid per Share		or Programs		the Approved Plan
April		0		—		0	$	4,962,118
May		57,000	$	23.61		57,000	$	3,616,068
June		0		—		0	$	3,616,068
Total		57,000	$	23.23		57,000	$	3,616,068

Item 4. Submission of Matters to a Vote of Security Holders

The annual meeting was held on April 24, 2006. At the meeting, three directors were elected, each for a three year term, and the shareholders approved the Firstbank Corporation 2006 Stock Compensation Plan. The votes were as follows:

			Vote
Director Nominee:	Term Expires		For:		Withheld:
Jeff A. Gardner		2009		4,481,643		30,387
David D. Roslund		2009		4,479,622		62,408
Thomas R. Sullivan		2009		4,356,441		155,589

Approval of the Firstbank Corporation 2006 Stock Compensation Plan:

For:		Against:		Abstained:
	2,892,086		421,744		56,311

Item 5. Other Information

The audit committee of the Board of Directors approved the categories of all non-audit services performed by the registrant’s independent accountants during the period covered by this report.

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Item 6. Exhibits

Exhibit	Description
10.1	Form of Stock Option Agreement 2006 Stock Compensation Plan
10.2	Form of Restricted Stock Agreement 2006 Stock Compensation Plan
31.1	Certificate of the President and Chief Executive Officer of Firstbank Corporation pursuant to 18 U.S.C. Section 7241, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2	Certificate of the Executive Vice President and Chief Financial Officer of Firstbank Corporation pursuant to 18 U.S.C. Section 7241, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1	Certificate of the Chief Executive Officer and the Chief Financial Officer of Firstbank Corporation pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

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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.

	FIRSTBANK CORPORATION (Registrant)
Date: August 7, 2006	/s/ Thomas R. Sullivan
	Thomas R. Sullivan President, Chief Executive Officer (Principal Executive Officer)
Date: August 7, 2006	/s/ Samuel G. Stone
	Samuel G. Stone Executive Vice President, Chief Financial Officer (Principal Accounting Officer)

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EXHIBIT INDEX

Exhibit	Description
10.1	Form of Stock Option Agreement 2006 Stock Compensation Plan
10.2	Form of Restricted Stock Agreement 2006 Stock Compensation Plan
31.1	Certificate of the Chief Executive Officer of Firstbank Corporation pursuant to 18 U.S.C. Section 7241, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2	Certificate of the Chief Financial Officer of Firstbank Corporation pursuant to 18 U.S.C. Section 7241, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1	Certificate of the Chief Executive Officer and the Chief Financial Officer of Firstbank Corporation pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

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