Loans (Nonaccrual Loans) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	$ 17,747	$ 21,237
Accruing loans 90 days or more past due	0	0
Current loans on nonaccrual status	3,300	3,600
Commercial Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	5,956	5,709
Commercial Construction and Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	0	0
Commercial Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	3,201	3,708
Residential Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	7,127	10,614
Homeowner Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	0	0
Home Equity Lines [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	1,013	718
Home Equity Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	376	335
Other Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	$ 74	$ 153