Loans (Past Due Loans) (Details) (USD $)	Dec. 31, 2013		Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans, included in past due loans	$ 15,600,000		$ 21,000,000
Loans 30 to 59 Days Past Due	5,638,000		6,607,000
Loans 60 to 89 Days Past Due	1,753,000		3,040,000
Loans Over 90 Days Past Due	14,512,000		18,449,000
Total Loans Past Due	21,903,000		28,096,000
Current Loans	2,440,981,000		2,265,907,000
Total loans	2,462,884,000	[1]	2,294,003,000	[1]
Commercial Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30 to 59 Days Past Due	0		373,000
Loans 60 to 89 Days Past Due	0		408,000
Loans Over 90 Days Past Due	7,492,000		10,300,000
Total Loans Past Due	7,492,000		11,081,000
Current Loans	788,757,000		699,732,000
Total loans	796,249,000		710,813,000
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	36,289,000		27,842,000
Total loans	36,289,000		27,842,000
Commercial Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30 to 59 Days Past Due	276,000		260,000
Loans 60 to 89 Days Past Due	302,000		296,000
Loans Over 90 Days Past Due	731,000		3,647,000
Total Loans Past Due	1,309,000		4,203,000
Current Loans	529,488,000		509,561,000
Total loans	530,797,000		513,764,000
Residential Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30 to 59 Days Past Due	4,040,000		4,840,000
Loans 60 to 89 Days Past Due	1,285,000		1,951,000
Loans Over 90 Days Past Due	5,633,000		3,658,000
Total Loans Past Due	10,958,000		10,449,000
Current Loans	738,205,000		682,349,000
Total loans	749,163,000		692,798,000
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	23,511,000		24,883,000
Total loans	23,511,000		24,883,000
Home Equity Lines [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30 to 59 Days Past Due	831,000		753,000
Loans 60 to 89 Days Past Due	100,000		207,000
Loans Over 90 Days Past Due	269,000		528,000
Total Loans Past Due	1,200,000		1,488,000
Current Loans	230,162,000		225,373,000
Total loans	231,362,000		226,861,000
Home Equity Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30 to 59 Days Past Due	448,000		252,000
Loans 60 to 89 Days Past Due	66,000		114,000
Loans Over 90 Days Past Due	349,000		250,000
Total Loans Past Due	863,000		616,000
Current Loans	39,349,000		38,713,000
Total loans	40,212,000		39,329,000
Other Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30 to 59 Days Past Due	43,000		129,000
Loans 60 to 89 Days Past Due	0		64,000
Loans Over 90 Days Past Due	38,000		66,000
Total Loans Past Due	81,000		259,000
Current Loans	55,220,000		57,454,000
Total loans	$ 55,301,000		$ 57,713,000

[1] Includes net unamortized loan origination costs of $879 thousand and $39 thousand, respectively, and net unamortized premiums on purchased loans of $99 thousand and $83 thousand, respectively, at December 31, 2013 and 2012.