Consolidated Statement of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
INTEREST AND DIVIDEND INCOME:
Interest and fees on loans	$ 29,916	$ 31,042	$ 30,305
Interest-bearing deposits with banks	81	90	43
Investment securities:
Taxable	4,575	4,876	6,044
Nontaxable	3,666	2,945	2,195
Dividends	55	47	28
TOTAL INTEREST AND DIVIDEND INCOME	38,293	39,000	38,615
INTEREST EXPENSE:
Deposits	7,944	9,560	11,222
Borrowed funds	1,739	1,780	2,009
TOTAL INTEREST EXPENSE	9,683	11,340	13,231
NET INTEREST INCOME	28,610	27,660	25,384
Provision for loan losses	675	1,255	925
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES	27,935	26,405	24,459
NON-INTEREST INCOME:
Service charges	4,380	3,997	3,867
Trust	665	542	521
Brokerage and insurance	352	439	284
Investment securities gains, net	334	99	139
Gains on loans sold	208	341	430
Earnings on bank owned life insurance	498	504	492
Other	592	446	369
TOTAL NON-INTEREST INCOME	7,029	6,368	6,102
NON-INTEREST EXPENSES:
Salaries and employee benefits	9,996	9,850	9,472
Occupancy	1,331	1,219	1,179
Furniture and equipment	449	454	437
Professional fees	744	681	660
Federal depository insurance	592	950	1,200
Pennsylvania shares tax	541	540	470
Other	4,869	4,421	4,596
TOTAL NON-INTEREST EXPENSES	18,522	18,115	18,014
Income before provision for income taxes	16,442	14,658	12,547
Provision for income taxes	3,610	3,156	2,683
NET INCOME	$ 12,832	$ 11,502	$ 9,864
NET INCOME - EARNINGS PER SHARE (in dollars per share)	$ 4.40	$ 3.93	$ 3.37
CASH DIVIDENDS PER SHARE (in dollars per share)	$ 1.16	$ 1.08	$ 1.01