Loans (Composition Of Loans Acquired At Acquisition) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 2,065,589	$ 1,973,103
Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	997,016	929,788
Home equity - junior liens (including lines of credit) [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	143,400	141,797
Commercial And Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	116,288	130,899
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	768,176	732,146
Consumer Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	37,383	35,845
Virginia Savings Bancorp, Inc. [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	71,979
Virginia Savings Bancorp, Inc. [Member] | Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	41,942
Virginia Savings Bancorp, Inc. [Member] | Home equity - junior liens (including lines of credit) [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	3,082
Virginia Savings Bancorp, Inc. [Member] | Commercial And Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	2,531
Virginia Savings Bancorp, Inc. [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	21,226
Virginia Savings Bancorp, Inc. [Member] | Consumer Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 3,198