S&T Bancorp, Inc. Consolidated Selected Financial Data December 31, 2008 (Dollars in thousands, except per share data)																			Page 1 of 3
	2007								2008								Year-to-date
	March 1Q		June 2Q		September 3Q		December 4Q		March 1Q		June 2Q		September 3Q		December 4Q		December 2008		December 2007
For the period:
Interest Income	$52,934		$54,274		$54,761		$53,637		$50,458		$50,433		$57,416		$57,811		$216,118		$215,605
Interest Expense	24,725		25,321		25,485		23,636		19,909		16,791		18,245		17,226		72,171		99,167
Net Interest Income	28,209		28,953		29,276		30,001		30,549		33,642		39,171		40,585		143,947		116,438
Taxable Equivalent Adjustment	1,186		1,216		1,170		1,156		1,148		1,227		1,385		1,388		5,147		4,727
Net Interest Income (FTE)	29,395		30,169		30,446		31,157		31,697		34,869		40,556		41,973		149,094		121,165
Provision For Loan Losses	2,178		1,305		1,142		1,187		1,279		(118)		6,156		5,561		12,878		5,812
Net Interest Income After Provisions (FTE)	27,217		28,864		29,304		29,970		30,418		34,987		34,400		36,412		136,216		115,353
Security Gains and Losses, Net	1,656		481		1,129		579		611		(1,829)		(341)		(92)		(1,651)		3,844
Service Charges and Fees	2,343		2,529		2,605		2,647		2,402		2,754		3,599		3,567		12,322		10,124
Wealth Management	1,855		1,978		1,751		1,886		1,862		1,907		2,118		2,081		7,967		7,470
Insurance	1,894		1,792		1,874		1,726		1,997		2,042		2,073		1,984		8,096		7,285
Other	2,424		2,744		4,270		2,443		2,638		3,100		2,811		2,168		10,718		11,882
Total Noninterest Income	8,516		9,043		10,500		8,702		8,899		9,803		10,601		9,800		39,103		36,761
Salaries and Employee Benefits	9,934		10,073		9,910		10,470		10,060		10,514		11,725		10,409		42,708		40,387
Occupancy and Equip. Expense, Net	2,261		2,447		2,423		2,452		2,660		2,636		2,761		2,838		10,895		9,583
Data Processing Expense	1,234		1,301		1,179		1,166		1,071		1,668		1,365		1,384		5,488		4,880
FDIC Expense	76		77		74		75		75		74		131		129		409		302
Other	4,084		4,163		4,543		5,518		4,089		7,492		6,358		6,363		24,301		18,308
Total Noninterest Expense	17,589		18,061		18,129		19,681		17,955		22,384		22,340		21,123		83,801		73,460
Income Before Taxes	19,800		20,327		22,804		19,570		21,973		20,577		22,320		24,997		89,867		82,498
Taxable Equivalent Adjustment	1,186		1,216		1,170		1,156		1,148		1,227		1,385		1,388		5,147		4,727
Applicable Income Taxes	5,316		5,235		5,973		5,103		5,969		5,489		5,249		7,809		24,517		21,627
Net Income	$13,298		$13,876		$15,661		$13,311		$14,856		$13,861		$15,686		$15,800		$60,203		$56,144
Per Common Share Data:
Shares Outstanding at End of Period	24,897,787		24,468,671		24,543,177		24,551,087		24,615,136		27,408,633		27,588,510		27,632,928		27,632,928		24,551,087
Average Shares Outstanding - Diluted	25,389,584		24,847,410		24,690,735		24,677,720		24,680,484		25,503,920		27,602,216		27,722,550		26,384,309		24,888,574
Net Income - Diluted	$0.52		$0.56		$0.63		$0.54		$0.60		$0.54		$0.57		$0.57		$2.28		$2.26
Dividends Declared	$0.30		$0.30		$0.30		$0.31		$0.31		$0.31		$0.31		$0.31		$1.24		$1.21
Book Value	$13.16		$12.98		$13.36		$13.75		$14.18		$16.00		$16.34		$16.24		$16.24		$13.75
Market Value	$33.04		$32.90		$32.09		$27.64		$32.17		$29.06		$36.83		$35.50		$35.50		$27.64

S&T Bancorp, Inc. Consolidated Selected Financial Data December 31, 2008 (Dollars in thousands)															Page 2 of 3
	2007								2008
	March 1Q		June 2Q		September 3Q		December 4Q		March 1Q		June 2Q		September 3Q		December 4Q
Asset Quality Data
Nonaccrual Loans and Nonperforming Loans	$19,854		$14,944		$14,445		$16,798		$23,212		$15,959		$32,793		$42,466
Assets acquired through foreclosure or     repossession	606		610		869		488		630		1,884		1,111		851
Nonperforming Assets	20,460		15,554		15,314		17,286		23,842		17,843		33,904		43,317
Allowance for Loan Losses	35,319		35,808		34,144		34,345		35,717		38,796		43,235		42,689
Nonperforming Loans / Loans	0.73%		0.54%		0.52%		0.60%		0.81%		0.46%		0.92%		1.19%
Allowance for Loan Losses / Loans	1.29%		1.31%		1.24%		1.23%		1.25%		1.12%		1.21%		1.20%
Allowance for Loan Losses / Nonperforming     Loans	178%		240%		236%		204%		154%		243%		132%		101%
Net Loan Charge-offs (Recoveries)	78		817		2,806		986		(94)		2,224		1,717		6,107
Net Loan Charge-offs (Recoveries)     (annualized)/ Average Loans	0.01%		0.12%		0.41%		0.14%		-0.01%		0.29%		0.20%		0.68%
Balance Sheet (Period-End)
Assets	$3,361,963		$3,368,761		$3,348,096		$3,407,621		$3,463,806		$4,353,568		$4,461,085		$4,438,368
Earning Assets	3,146,934		3,141,844		3,126,714		3,169,594		3,212,919		3,934,187		4,075,431		4,044,970
Securities	412,384		398,612		375,151		372,655		362,053		466,524		496,844		476,255
Loans, Gross	2,734,550		2,743,232		2,751,564		2,796,939		2,850,866		3,467,663		3,578,587		3,568,716
Total Deposits	2,576,887		2,624,495		2,620,176		2,621,825		2,605,187		3,114,560		3,131,882		3,228,416
Non-Interest Bearing Deposits	444,525		446,455		451,196		459,708		471,040		593,339		600,246		600,282
NOW, Money Market & Savings	1,204,833		1,230,290		1,233,969		1,243,061		1,203,833		1,325,755		1,280,816		1,334,324
CD's $100,000 and over	259,390		258,311		250,011		249,643		250,489		329,087		353,167		377,748
Other Time Deposits	668,139		689,439		685,000		669,413		679,825		866,379		897,653		916,062
Short-term borrowings	169,552		144,342		125,809		180,258		211,391		472,045		552,505		421,894
Long-term Debt	246,715		246,487		236,255		226,021		246,403		281,163		280,921		270,950
Shareholders' Equity	327,559		317,707		327,863		337,560		349,073		438,499		450,717		448,694
Balance Sheet (Daily Averages)
Assets	$3,312,784		$3,344,544		$3,339,979		$3,346,685		$3,407,665		$3,701,389		$4,346,481		$4,419,465
Earning Assets	3,108,328		3,134,253		3,127,103		3,137,967		3,198,279		3,434,268		3,961,327		4,042,118
Securities	420,645		403,351		384,405		370,100		369,400		386,243		472,293		490,754
Loans, Gross	2,687,564		2,730,618		2,740,458		2,767,615		2,828,762		3,048,024		3,488,843		3,551,179
Deposits	2,550,819		2,578,878		2,623,770		2,620,448		2,579,321		2,712,198		3,086,428		3,205,711
Shareholders' Equity	339,168		325,966		324,124		333,880		345,939		377,160		447,941		458,600

S&T Bancorp, Inc. Consolidated Selected Financial Data December 31, 2008 (Dollars in thousands, except per share data)																			Page 3 of 3
	2007								2008								Year-to-date
	March 1Q		June 2Q		September 3Q		December 4Q		March 1Q		June 2Q		September 3Q		December 4Q		December 2008		December 2007
Profitability Ratios (annualized)
Return on Average Assets	1.63%		1.66%		1.86%		1.58%		1.75%		1.51%		1.44%		1.42%		1.52%		1.68%
Return on Average Shareholders' Equity	15.90%		17.07%		19.17%		15.82%		17.27%		14.78%		13.93%		13.71%		14.77%		16.97%
Yield on Earning Assets (FTE)	7.06%		7.10%		7.10%		6.93%		6.49%		6.05%		5.92%		5.83%		6.05%		7.05%
Cost of Interest Bearing Funds	4.00%		4.01%		3.99%		3.70%		3.10%		2.43%		2.23%		2.06%		2.41%		3.92%
Net Interest Margin (FTE)(4)	3.84%		3.86%		3.86%		3.94%		3.99%		4.08%		4.07%		4.13%		4.07%		3.87%
Efficiency Ratio (FTE)(1)	46.40%		46.06%		44.28%		49.38%		44.23%		50.11%		43.67%		40.80%		44.53%		46.52%
Capitalization Ratios
Dividends Paid to Net Income	57.21%		53.92%		46.86%		55.31%		51.23%		55.05%		54.17%		54.13%
Shareholders' Equity to Assets (Period End)	9.74%		9.43%		9.79%		9.91%		10.08%		10.07%		10.10%		10.11%
Leverage Ratio (2)	8.38%		8.06%		8.38%		8.57%		9.28%		8.05%		7.15%		7.30%
Risk Based Capital - Tier I (3)	9.23%		8.94%		9.35%		9.50%		10.29%		7.99%		8.23%		8.65%
Risk Based Capital - Tier II (3)	11.45%		11.15%		11.50%		11.64%		12.46%		11.12%		11.40%		11.82%
Definitions: (1) Recurring non-interest expense divided by recurring non-interest income plus net interest income, on a fully taxable equivalent basis. (2) Equity less goodwill to total assets and allowance for loan losses. (3) Effective October 1, 1998, banking regulators require financial institutions to include 45% of the pretax net unrealized holding gains on available for sale equity securities in Tier 2 capital. (4) Net interest income, on a fully taxable equivalent basis, annualized divided by quarter-to-date average earning assets.