Loans (Narrative) (Details) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 2,085,232,000	$ 1,973,103,000
Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Construction loans	12,800,000	9,300,000
Gross loans	1,008,305,000	929,788,000
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Construction loans	17,100,000	20,200,000
Gross loans	787,887,000	732,146,000
Virginia Savings Bank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractual principal balance	10,800,000
Virginia Savings Bank [Member] | Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 6,500,000