Derivative Financial Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 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 derivative instruments held	2	3
Derivative asset notional amount	$ 23.0	$ 33.0
Pledged collateral to derivative counterparties	1.6	2.0
Interest rate swaps with customers [Member] | Derivatives not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative asset notional amount	105.6	70.5
Interest rate swaps with customers [Member] | Mirror swaps with counterparties [Member]
Derivatives, Fair Value [Line Items]
Derivative asset notional amount	$ 105.6	$ 70.5