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	Jun. 30, 2013	Dec. 31, 2012
Interest Rate Lock Commitments
Derivatives, Fair Value [Line Items]
Notional Amount	$ 130,022	$ 267,397
Notional Amount	34,898
Forward Contracts
Derivatives, Fair Value [Line Items]
Notional Amount	341,776	168,910
Notional Amount	171,272	351,996
Other Assets | Interest Rate Lock Commitments
Derivatives, Fair Value [Line Items]
Fair Value	2,913	9,353
Other Assets | Forward Contracts
Derivatives, Fair Value [Line Items]
Fair Value	12,091	462
Other Liabilities | Interest Rate Lock Commitments
Derivatives, Fair Value [Line Items]
Fair Value	(437)
Other Liabilities | Forward Contracts
Derivatives, Fair Value [Line Items]
Fair Value	$ (2,709)	$ (1,221)