Derivative Financial Instruments (Derivative instruments gains an dlosses recognized (not designated as hedging instruments)) (Details) (Gain on Sale of Loans, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Interest Rate Lock Commitments
Trading Activity, Gains and Losses, Net [Line Items]
Year-to-Date Gain(Loss) Recognized	$ (3,161)	$ 2,795
Forward Contracts
Trading Activity, Gains and Losses, Net [Line Items]
Year-to-Date Gain(Loss) Recognized	$ 372	$ 909