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	Sep. 30, 2015	Dec. 31, 2014
Other Assets | Interest rate lock commitments
Derivatives, Fair Value [Line Items]
Notional Amount. Other Assets	$ 126,619	$ 74,863
Fair Value, Other Assets	4,903	2,496
Other Assets | Forward commitments
Derivatives, Fair Value [Line Items]
Notional Amount. Other Assets	117,525	88,484
Fair Value, Other Assets	833	275
Other Liabilities | Forward commitments
Derivatives, Fair Value [Line Items]
Notional Amount, Other Liabilities	309,020	218,337
Fair Value, Other Liabilities	$ (2,841)	$ (1,619)