Consolidated Statement of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
INTEREST AND DIVIDEND INCOME:
Interest and fees on loans	$ 29,770	$ 29,916	$ 31,042
Interest-bearing deposits with banks	21	81	90
Investment securities:
Taxable	4,521	4,575	4,876
Nontaxable	3,702	3,666	2,945
Dividends	71	55	47
TOTAL INTEREST AND DIVIDEND INCOME	38,085	38,293	39,000
INTEREST EXPENSE:
Deposits	6,113	7,944	9,560
Borrowed funds	1,546	1,739	1,780
TOTAL INTEREST EXPENSE	7,659	9,683	11,340
NET INTEREST INCOME	30,426	28,610	27,660
Provision for loan losses	420	675	1,255
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES	30,006	27,935	26,405
NON-INTEREST INCOME:
Service charges	4,475	4,380	3,997
Trust	644	665	542
Brokerage and insurance	392	352	439
Investment securities gains, net	604	334	99
Gains on loans sold	759	208	341
Earnings on bank owned life insurance	507	498	504
Other	456	479	374
TOTAL NON-INTEREST INCOME	7,837	6,916	6,296
NON-INTEREST EXPENSES:
Salaries and employee benefits	11,018	9,996	9,850
Occupancy	1,265	1,331	1,219
Furniture and equipment	411	449	454
Professional fees	891	744	681
Federal depository insurance	468	592	950
Pennsylvania shares tax	602	541	540
Other	4,642	4,756	4,349
TOTAL NON-INTEREST EXPENSES	19,297	18,409	18,043
Income before provision for income taxes	18,546	16,442	14,658
Provision for income taxes	4,331	3,610	3,156
NET INCOME	$ 14,215	$ 12,832	$ 11,502
PER COMMON SHARE DATA:
NET INCOME - BASIC (in dollars per share)	$ 4.88	$ 4.36	$ 3.90
NET INCOME - DILUTED (in dollars per share)	$ 4.88	$ 4.36	$ 3.90
CASH DIVIDENDS PER SHARE (in dollars per share)	$ 1.58	$ 1.15	$ 1.07