Commitments and Contingencies (Financial Instruments with Off Balance Sheet Risk) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Commitments to originate fixed rate mortgage loans to be sold [Member] | Forward Contracts [Member] | Notional or Principal Amount [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance Sheet Risks, Asset	$ 83,633	$ 56,950
Commitments to sell fixed rate mortgage loans [Member] | Forward Contracts [Member] | Notional or Principal Amount [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance Sheet Risk, Liability	106,340	76,574
Interest rate swaps with customers [Member] | Interest Rate Swap [Member] | Notional or Principal Amount [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance Sheet Risks, Asset	60,958	61,586
Mirror swaps with counterparties [Member] | Interest Rate Swap [Member] | Notional or Principal Amount [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance Sheet Risk, Liability	60,958	61,586
Interest rate swap contracts [Member] | Interest Rate Swap [Member] | Notional or Principal Amount [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance Sheet Risk, Liability	32,991	32,991
Commitments to extend credit on commerical loans [Member] | Commitments to Extend Credit [Member] | Contract Amount [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance Sheet Risks, Asset	221,163	222,805
Commitments to extend credit on home equity lines [Member] | Commitments to Extend Credit [Member] | Contract Amount [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance Sheet Risks, Asset	183,895	185,124
Commitments to extend credit on other loans [Member] | Commitments to Extend Credit [Member] | Contract Amount [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance Sheet Risks, Asset	33,395	35,035
Commitments to extend credit on standby letters of credit [Member] | Commitments to Extend Credit [Member] | Contract Amount [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance Sheet Risks, Asset	$ 8,777	$ 8,560