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	Mar. 31, 2015	Dec. 31, 2014
Other Assets | Interest rate lock commitments
Derivatives, Fair Value [Line Items]
Notional Amount	$ 208,915	$ 74,863
Fair Value	6,875	2,496
Other Assets | Forward commitments
Derivatives, Fair Value [Line Items]
Notional Amount	115,352	88,484
Fair Value	404	275
Other Liabilities | Forward commitments
Derivatives, Fair Value [Line Items]
Notional Amount	331,161	218,337
Fair Value	$ (1,873)	$ (1,619)