Loans (Composition Of Loans Acquired At Acquisition) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 2,085,232	$ 1,973,103
Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,008,305	929,788
Home equity - junior liens (including lines of credit) [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	143,058	141,797
Commercial And Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	105,027	130,899
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	787,887	732,146
Consumer Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	38,285	35,845
Virginia Savings Bancorp, Inc. [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	69,105
Virginia Savings Bancorp, Inc. [Member] | Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	22,789
Virginia Savings Bancorp, Inc. [Member] | Home equity - junior liens (including lines of credit) [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	6,137
Virginia Savings Bancorp, Inc. [Member] | Commercial And Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	2,810
Virginia Savings Bancorp, Inc. [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	34,435
Virginia Savings Bancorp, Inc. [Member] | Consumer Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 2,934