Loans, Major Classifications of Loans, Net of Income and Deferred Loan Origination Cost (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($) Segment	Dec. 31, 2014 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income and deferred origination costs	$ 2,820,460	$ 2,733,824
Number of portfolio segments | Segment	9
Loans held for sale [Abstract]
Loans held for sale	$ 1,983	2,264
Commercial [Member] | Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income and deferred origination costs	106,855	121,942
Commercial [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income and deferred origination costs	997,654	948,626
Commercial [Member] | Equipment Lease Financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income and deferred origination costs	9,146	10,344
Commercial [Member] | Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income and deferred origination costs	346,318	352,048
Residential [Member] | Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income and deferred origination costs	62,226	62,412
Residential [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income and deferred origination costs	706,187	712,465
Residential [Member] | Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income and deferred origination costs	88,624	88,335
Consumer [Member] | Consumer Direct [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income and deferred origination costs	125,847	122,136
Consumer [Member] | Consumer Indirect [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income and deferred origination costs	$ 377,603	$ 315,516