Commitments and Contingencies (Summary of Contractual and Notional Amounts of Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Forward commitments to sell residential mortgage loans
Financial Instruments [Line Items]
Notional amount of derivative financial instruments	$ 7,800
Derivative mortgage loan commitments
Financial Instruments [Line Items]
Notional amount of derivative financial instruments		2,356
Customer loan swaps
Financial Instruments [Line Items]
Notional amount of derivative financial instruments	16,093	12,240
Interest rate swaps
Financial Instruments [Line Items]
Notional amount of derivative financial instruments	43,000	43,000
Home Equity
Financial Instruments [Line Items]
Contractual amounts of financial instrument	277,373	254,603
Commercial and commercial real estate
Financial Instruments [Line Items]
Contractual amounts of financial instrument	20,016	21,972
Residential
Financial Instruments [Line Items]
Contractual amounts of financial instrument	9,497	2,060
Letters of Credit
Financial Instruments [Line Items]
Contractual amounts of financial instrument	1,836	1,178
Other Commitments
Financial Instruments [Line Items]
Contractual amounts of financial instrument	$ 16,845	$ 1,932