S&T Bancorp, Inc. Consolidated Selected Financial Data September 30, 2005 (Dollars in thousands except per share data)									Page 1 of 3
	2004				2005			Nine Months Ended
	March	June	September	December	March	June	September	September	September
For the period:	1Q	2Q	3Q	4Q	1Q	2Q	3Q	2005	2004
Interest Income	$35,596	$36,235	$37,726	$39,075	$39,466	$42,144	$44,035	$125,646	$109,563
Interest Expense	9,506	9,542	10,549	11,287	12,148	13,780	15,595	41,523	29,603
Net Interest Income	26,090	26,693	27,177	27,788	27,318	28,364	28,440	84,123	79,960
Taxable Equivalent Adjustment	920	923	927	936	975	1,002	1,024	3,002	2,769
Net Interest Income (FTE)	27,010	27,616	28,104	28,724	28,293	29,366	29,464	87,125	82,729
Provision For Loan Losses	1,500	1,900	1,500	(500)	800	(300)	3,000	3,500	4,900
Net Interest Income
After Provisions (FTE)	25,510	25,716	26,604	29,224	27,493	29,666	26,464	83,625	77,829
Security Gains, Net	1,520	1,708	1,144	972	1,668	801	1,300	3,769	4,372
Service Charges and Fees	2,232	2,359	2,316	2,476	2,181	2,338	2,504	7,023	6,906
Wealth Management	1,517	1,525	1,471	1,688	1,643	1,831	1,760	5,234	4,513
Insurance	1,076	1,115	1,219	1,148	1,403	1,387	1,403	4,193	3,410
Other	2,048	2,474	1,814	2,380	2,191	2,948	2,473	7,612	6,336
Total Other Income	6,873	7,473	6,820	7,692	7,418	8,504	8,140	24,062	21,165
Salaries and Employee Benefits	8,292	8,006	8,438	8,109	8,798	8,440	8,754	25,992	24,736
Occupancy and Equip. Expense, Net	1,720	1,710	1,752	1,900	2,290	1,939	1,892	6,121	5,181
Data Processing Expense	999	975	956	1,036	1,035	1,092	1,046	3,172	2,930
FDIC Expense	73	74	72	70	74	75	71	220	219
Other	3,653	4,049	3,678	4,630	3,876	4,059	2,932	10,868	11,379
Total Other Expense	14,737	14,814	14,896	15,745	16,073	15,605	14,695	46,373	44,445
Income Before Taxes	19,166	20,083	19,672	22,143	20,506	23,366	21,209	65,083	58,921
Taxable Equivalent Adjustment	920	923	927	936	975	1,002	1,024	3,002	2,769
Applicable Income Taxes	5,290	5,588	5,468	6,655	5,711	6,871	5,818	18,400	16,346
Net Income	$12,956	$13,572	$13,277	$14,552	$13,820	$15,493	$14,367	$43,681	$39,806
Per Common Share Data:
Shares Outstanding at End of Period	26,619,399	26,261,769	26,513,869	26,600,395	26,584,029	26,200,529	26,364,095	26,364,095	26,513,869
Average Shares Outstanding - Diluted	26,950,542	26,644,177	26,709,616	26,896,777	26,951,090	26,644,682	26,618,216	26,737,136	26,767,731
Net Income - Diluted	$0.48	$0.51	$0.50	$0.54	$0.51	$0.58	$0.54	$1.63	$1.49
Dividends Declared	$0.26	$0.27	$0.27	$0.27	$0.28	$0.28	$0.28	$0.84	$0.80
Book Value	$12.74	$12.25	$12.77	$13.12	$13.06	$13.09	$13.35	$13.35	$12.77
Market Value	$30.06	$31.98	$35.71	$37.69	$35.40	$36.10	$37.80	$37.80	$35.71

S&T Bancorp, Inc. Consolidated Selected Financial Data September 30, 2005 (Dollars in thousands)							Page 2 of 3
	2004				2005
	March	June	September	December	March	June	September
Asset Quality Data	1Q	2Q	3Q	4Q	1Q	2Q	3Q
Nonaccrual Loans and Nonperforming Loans	$12,465	$13,514	$15,895	$6,309	$7,331	$5,944	$8,368
Assets acquired through foreclosure
or repossession	2,287	521	2,822	2,119	1,536	945	1,908
Nonperforming Assets	14,752	14,035	18,717	8,428	8,867	6,889	10,276
Allowance for Loan Losses	32,658	32,792	32,127	34,262	34,339	33,525	36,093
Nonperforming Loans / Loans	0.57%	0.60%	0.69%	0.28%	0.32%	0.25%	0.35%
Allowance for Loan Losses / Loans	1.50%	1.46%	1.40%	1.50%	1.48%	1.40%	1.50%
Allowance for Loan Losses /
Nonperforming Loans	262%	243%	202%	543%	468%	564%	431%
Net Loan Charge-offs (Recoveries)	320	1,765	2,166	(2,635)	723	(455)	432
Net Loan Charge-offs (Recoveries) (annualized)/
Average Loans	0.06%	0.32%	0.38%	-0.46%	0.13%	-0.08%	0.07%
Balance Sheet (Period-End)
Assets	$2,956,404	$3,006,203	$3,009,776	$2,989,034	$3,027,881	$3,095,177	$3,104,433
Earning Assets	2,776,693	2,823,231	2,829,035	2,805,522	2,841,330	2,900,582	2,909,863
Securities	592,761	576,612	536,783	518,171	522,631	509,985	499,545
Loans, Gross	2,183,931	2,246,619	2,292,253	2,287,351	2,318,699	2,390,598	2,410,318
Total Deposits	1,977,330	1,976,340	2,079,182	2,176,263	2,168,932	2,208,204	2,306,604
Non-Interest Bearing Deposits	382,110	376,471	416,748	415,812	404,557	409,721	417,894
NOW, Money Market & Savings	756,965	742,582	772,783	896,395	904,809	922,923	965,625
CD's $100,000 and over	176,512	187,574	197,347	192,761	187,010	201,076	210,024
Other Time Deposits	661,743	669,713	692,304	671,295	672,556	674,484	713,061
Short-term borrowings	463,000	542,598	456,684	323,384	399,846	410,362	314,467
Long-term Debt	116,890	116,894	86,328	86,303	61,115	81,080	83,860
Shareholder's Equity	339,095	321,625	338,575	349,129	347,279	342,852	351,983
Balance Sheet (Daily Averages)
Assets	$2,908,794	$2,979,134	$3,002,225	$3,000,134	$2,998,237	$3,061,157	$3,090,488
Earning Assets	2,732,315	2,798,943	2,821,311	2,818,925	2,813,642	2,869,845	2,897,199
Securities	597,845	583,192	555,568	530,547	518,872	516,704	504,806
Loans, Gross	2,134,470	2,215,751	2,264,843	2,285,101	2,294,699	2,353,141	2,381,551
Deposits	1,955,025	1,982,751	2,040,251	2,116,041	2,157,201	2,188,288	2,269,085
Shareholder's Equity	341,835	330,474	333,545	347,105	353,472	347,871	351,432

S&T Bancorp, Inc. Consolidated Selected Financial Data September 30, 2005 (Dollars in thousands except per share data)									Page 3 of 3
	2004				2005			Nine Months Ended
	March	June	September	December	March	June	September	September	September
Profitability Ratios (annualized)	1Q	2Q	3Q	4Q	1Q	2Q	3Q	2005	2004
Return on Average Assets	1.79%	1.83%	1.76%	1.93%	1.87%	2.03%	1.84%	1.91%	1.79%
Return on Average Shareholder's Equity	15.24%	16.52%	15.84%	16.68%	15.86%	17.86%	16.22%	16.64%	15.86%
Yield on Earning Assets (FTE)	5.39%	5.35%	5.46%	5.66%	5.84%	6.04%	6.18%	6.02%	5.40%
Cost of Interest Bearing Funds	1.79%	1.74%	1.90%	2.06%	2.27%	2.46%	2.73%	2.49%	1.81%
Net Interest Margin (FTE)(4)	3.98%	3.97%	3.96%	4.05%	4.08%	4.10%	4.03%	4.07%	3.97%
Efficiency Ratio (FTE)(1)	43.49%	42.22%	42.66%	43.24%	45.01%	41.21%	39.08%	41.71%	42.78%
Capitalization Ratios
Dividends Paid to Net Income	53.48%	51.06%	53.34%	49.20%	51.96%	48.16%	51.08%
Shareholder's Equity to Assets (Period End)	11.47%	10.70%	11.25%	11.68%	11.47%	11.08%	11.34%
Leverage Ratio (2)	9.15%	8.80%	9.15%	9.51%	9.68%	9.27%	9.56%
Risk Based Capital - Tier I (3)	10.55%	10.10%	10.44%	10.84%	10.86%	10.29%	10.73%
Risk Based Capital - Tier II (3)	12.31%	11.78%	12.13%	12.58%	12.52%	11.89%	12.35%
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.