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	Mar. 31, 2016	Dec. 31, 2015
Other Assets | Interest rate lock commitments
Derivatives, Fair Value [Line Items]
Notional Amount. Other Assets	$ 153,073	$ 99,665
Fair Value, Other Assets	6,956	3,168
Other Assets | Forward commitments
Derivatives, Fair Value [Line Items]
Notional Amount. Other Assets	61,000	118,378
Fair Value, Other Assets	343	523
Other Liabilities | Forward commitments
Derivatives, Fair Value [Line Items]
Notional Amount, Other Liabilities	258,183	136,709
Fair Value, Other Liabilities	(1,623)	(315)
Other Liabilities | Undesignated interest rate swaps
Derivatives, Fair Value [Line Items]
Notional Amount, Other Liabilities	23,005	50,975
Fair Value, Other Liabilities	$ (2,159)	$ (3,677)