Derivative Financial Instruments (Narrative) (Details) (USD $)	Sep. 30, 2013 derivative_instrument	Dec. 31, 2012 derivative_instrument
Interest rate swap contracts [Member] | Derivatives Designated as Cash Flow Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Number of Instruments Held	2	3
Derivative asset notional amount	$ 23,000,000	$ 33,000,000
Pledged collateral to derivative counterparties	1,700,000	2,000,000
Interest rate swaps with customers [Member] | Derivatives not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative asset notional amount	64,898,000	70,493,000
Mirror swaps with counterparties [Member] | Derivatives not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative asset notional amount	$ 64,898,000	$ 70,493,000