Derivative Financial Instruments (Balance sheet category and fair values of derivative instruments (not designated as hedging instruments)) (Details) (Not Designated as Hedging Instrument, USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Other Assets | Interest Rate Lock Commitments
Derivatives, Fair Value [Line Items]
Notional Amount	$ 104,098	$ 267,397
Fair Value	4,601	9,353
Other Assets | Forward Contracts
Derivatives, Fair Value [Line Items]
Notional Amount	69,100	168,910
Fair Value	1,271	462
Other Liabilities | Forward Contracts
Derivatives, Fair Value [Line Items]
Notional Amount	185,942	351,996
Fair Value	$ (3,320)	$ (1,221)