Loans (Summary of Loans) (Details) (USD $)	Mar. 31, 2014		Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial	$ 1,337,283,000		$ 1,363,335,000
Residential real estate	810,393,000		772,674,000
Consumer	330,927,000		326,875,000
Total loans	2,478,603,000	[1]	2,462,884,000	[1]
Percent of Total Loans	100.00%	[1]	100.00%	[1]
Net unamortized loan orgination costs	1,100,000		879,000
Net unamortized premiums on pruchased loans	102,000		99,000
Loans pledged as collateral	1,160,000,000		1,140,000,000
Commercial Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial	788,836,000	[2]	796,249,000	[2]
Total loans	788,836,000		796,249,000
Percent of Total Loans	32.00%	[2]	32.00%	[2]
Commercial Construction and Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial	24,696,000	[3]	36,289,000	[3]
Total loans	24,696,000		36,289,000
Percent of Total Loans	1.00%	[3]	1.00%	[3]
Commercial Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial	523,751,000	[4]	530,797,000	[4]
Total loans	523,751,000		530,797,000
Percent of Total Loans	21.00%	[4]	22.00%	[4]
Commercial Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial	1,337,283,000		1,363,335,000
Percent of Total Loans	54.00%		55.00%
Residential Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential real estate	784,623,000	[5]	749,163,000	[5]
Total loans	784,623,000		749,163,000
Percent of Total Loans	32.00%	[5]	30.00%	[5]
Homeowner Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential real estate	25,770,000		23,511,000
Total loans	25,770,000		23,511,000
Percent of Total Loans	1.00%		1.00%
Residential Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential real estate	810,393,000		772,674,000
Percent of Total Loans	33.00%		31.00%
Home Equity Lines [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer	233,728,000		231,362,000
Total loans	233,728,000		231,362,000
Percent of Total Loans	9.00%		9.00%
Home Equity Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer	41,991,000		40,212,000
Total loans	41,991,000		40,212,000
Percent of Total Loans	2.00%		2.00%
Other Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer	55,208,000	[5]	55,301,000	[5]
Total loans	55,208,000		55,301,000
Percent of Total Loans	2.00%	[5]	3.00%	[5]
Consumer Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer	$ 330,927,000		$ 326,875,000
Percent of Total Loans	13.00%		14.00%

[1] Includes net unamortized loan origination costs of $1.1 million and $879 thousand, respectively, and net unamortized premiums on purchased loans of $102 thousand and $99 thousand, respectively, at March 31, 2014 and December 31, 2013.

[2] Amortizing mortgages and lines of credit, primarily secured by income producing property.

[3] Loans for construction commercial properties, loans to developers for construction of residential properties and loans for land development.

[4] Loans to businesses and individuals, a substantial portion of which are fully or partially collateralized by real estate.

[5] Fixed-rate consumer installment loans.