Loans (Past Due Loans) (Details) (USD $)	Mar. 31, 2014		Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30 to 59 Days Past Due	$ 6,948,000		$ 5,638,000
Loans 60 to 89 Days Past Due	2,065,000		1,753,000
Loans Over 90 Days Past Due	9,001,000		14,512,000
Total Loans Past Due	18,014,000		21,903,000
Current Loans	2,460,589,000		2,440,981,000
Total loans	2,478,603,000	[1]	2,462,884,000	[1]
Loans Receivable, Past Due, Nonaccrual	11,500,000		15,600,000
Commercial Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30 to 59 Days Past Due	0		0
Loans 60 to 89 Days Past Due	15,000		0
Loans Over 90 Days Past Due	2,238,000		7,492,000
Total Loans Past Due	2,253,000		7,492,000
Current Loans	786,583,000		788,757,000
Total loans	788,836,000		796,249,000
Commercial Construction and Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30 to 59 Days Past Due	0		0
Loans 60 to 89 Days Past Due	0		0
Loans Over 90 Days Past Due	0		0
Total Loans Past Due	0		0
Current Loans	24,696,000		36,289,000
Total loans	24,696,000		36,289,000
Commercial Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30 to 59 Days Past Due	3,351,000		276,000
Loans 60 to 89 Days Past Due	127,000		302,000
Loans Over 90 Days Past Due	428,000		731,000
Total Loans Past Due	3,906,000		1,309,000
Current Loans	519,845,000		529,488,000
Total loans	523,751,000		530,797,000
Residential Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30 to 59 Days Past Due	2,232,000		4,040,000
Loans 60 to 89 Days Past Due	1,265,000		1,285,000
Loans Over 90 Days Past Due	5,634,000		5,633,000
Total Loans Past Due	9,131,000		10,958,000
Current Loans	775,492,000		738,205,000
Total loans	784,623,000		749,163,000
Homeowner Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30 to 59 Days Past Due	0		0
Loans 60 to 89 Days Past Due	0		0
Loans Over 90 Days Past Due	0		0
Total Loans Past Due	0		0
Current Loans	25,770,000		23,511,000
Total loans	25,770,000		23,511,000
Home Equity Lines [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30 to 59 Days Past Due	1,004,000		831,000
Loans 60 to 89 Days Past Due	492,000		100,000
Loans Over 90 Days Past Due	269,000		269,000
Total Loans Past Due	1,765,000		1,200,000
Current Loans	231,963,000		230,162,000
Total loans	233,728,000		231,362,000
Home Equity Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30 to 59 Days Past Due	351,000		448,000
Loans 60 to 89 Days Past Due	116,000		66,000
Loans Over 90 Days Past Due	366,000		349,000
Total Loans Past Due	833,000		863,000
Current Loans	41,158,000		39,349,000
Total loans	41,991,000		40,212,000
Other Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30 to 59 Days Past Due	10,000		43,000
Loans 60 to 89 Days Past Due	50,000		0
Loans Over 90 Days Past Due	66,000		38,000
Total Loans Past Due	126,000		81,000
Current Loans	55,082,000		55,220,000
Total loans	$ 55,208,000		$ 55,301,000

[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.