Loans (Nonaccrual Loans) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	$ 25,675	$ 22,543
Accruing loans 90 days or more past due	0	0
Commercial Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	14,953	10,681
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	3,122	4,412
Residential Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	6,699	6,158
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	406	840
Home Equity Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	431	371
Other Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	64	81
Current Payment Status [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current loans on nonaccrual status	$ 6,700	$ 1,600