Commitments and Contingencies (Financial Instruments with Off Balance Sheet Risk) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
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	$ 51,435	$ 67,792
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	80,598	116,162
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	65,334	70,493
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	65,334	70,493
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	22,681	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	225,599	223,426
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	195,981	184,941
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	29,152	30,504
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	$ 1,222	$ 1,039