Loans, Major Classifications of Loans, Net of Income and Deferred Loan Origination Cost (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Major classification of loans, net of unearned income and deferred loan origination costs [Line Items]
Loans, net of unearned income and deferred origination costs	$ 2,683,905,000	$ 2,615,354,000
Loans held for sale [Abstract]
Loans held for sale	367,000	828,000
Threshold amount of loan require performance bond	500,000
Secured commercial loan requesting financing (in hundredths)	100.00%
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	120,248,000	110,779,000
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	931,455,000	872,542,000
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	10,055,000	8,840,000
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	347,035,000	374,881,000
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	62,105,000	56,075,000
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	703,323,000	697,601,000
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	88,291,000	84,880,000
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	121,367,000	122,215,000
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	$ 300,026,000	$ 287,541,000