Loans, Major Classifications of Loans, Net of Income and Deferred Loan Origination Cost (Details) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Major classification of loans, net of unearned income and deferred loan origination costs [Line Items]
Loans, net of unearned income and deferred origination costs	$ 2,551,537,000	$ 2,556,548,000
Loans held for sale [Abstract]
Loans held-for-sale, Amount	800,000	500,000
Capitalized fees and cost related to origination of loans	600,000	700,000
Loans acquired in transfer	74,000,000	88,500,000
Provision expense	600,000
Changes in accretable yield [Roll Forward]
Beginning balance	720,000	2,995,000
Accretion	(580,000)	(1,067,000)
Disposals	(140,000)	(1,208,000)
Ending balance	0	720,000
Commercial Construction [Member]
Major classification of loans, net of unearned income and deferred loan origination costs [Line Items]
Loans, net of unearned income and deferred origination costs	115,091,000	120,577,000
Commercial Secured By Real Estate [Member]
Major classification of loans, net of unearned income and deferred loan origination costs [Line Items]
Loans, net of unearned income and deferred origination costs	820,925,000	798,887,000
Equipment Lease Financing [Member]
Major classification of loans, net of unearned income and deferred loan origination costs [Line Items]
Loans, net of unearned income and deferred origination costs	10,167,000	9,706,000
Commercial Other [Member]
Major classification of loans, net of unearned income and deferred loan origination costs [Line Items]
Loans, net of unearned income and deferred origination costs	379,308,000	374,597,000
Real Estate Construction [Member]
Major classification of loans, net of unearned income and deferred loan origination costs [Line Items]
Loans, net of unearned income and deferred origination costs	54,431,000	53,534,000
Real Estate Mortgage [Member]
Major classification of loans, net of unearned income and deferred loan origination costs [Line Items]
Loans, net of unearned income and deferred origination costs	664,329,000	650,075,000
Home Equity [Member]
Major classification of loans, net of unearned income and deferred loan origination costs [Line Items]
Loans, net of unearned income and deferred origination costs	82,724,000	84,841,000
Consumer Direct [Member]
Major classification of loans, net of unearned income and deferred loan origination costs [Line Items]
Loans, net of unearned income and deferred origination costs	126,005,000	123,949,000
Consumer Indirect [Member]
Major classification of loans, net of unearned income and deferred loan origination costs [Line Items]
Loans, net of unearned income and deferred origination costs	$ 298,557,000	$ 340,382,000