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	Jun. 30, 2016	Dec. 31, 2015
Other assets | Interest rate lock commitments (mortgage)
Derivatives, Fair Value [Line Items]
Notional Amount. Other Assets	$ 142,118	$ 99,665
Fair Value, Other Assets	6,864	3,168
Other assets | Forward commitments
Derivatives, Fair Value [Line Items]
Notional Amount. Other Assets	55,000	118,378
Fair Value, Other Assets	469	523
Other liabilities | Forward commitments
Derivatives, Fair Value [Line Items]
Notional Amount, Other Liabilities	247,171	136,709
Fair Value, Other Liabilities	(2,502)	(315)
Other liabilities | Undesignated interest rate swaps
Derivatives, Fair Value [Line Items]
Notional Amount, Other Liabilities	22,814	50,975
Fair Value, Other Liabilities	$ (2,213)	$ (3,677)