Derivative Financial Instruments (Derivative instruments gains and losses recognized (not designated as hedging instruments)) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Gains on sale of loans held for sale | Interest rate lock commitments
Trading Activity, Gains and Losses, Net [Line Items]
Gain (Loss) Recognized	$ 4,727	$ 5,544
Gains on sale of loans held for sale | Forward commitments
Trading Activity, Gains and Losses, Net [Line Items]
Gain (Loss) Recognized	(1,489)	(125)
Other noninterest income | Undesignated interest rate swaps
Trading Activity, Gains and Losses, Net [Line Items]
Gain (Loss) Recognized	$ (316)	$ 0