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, 2016	Dec. 31, 2015
Other assets | Interest rate lock commitments (mortgage)
Derivatives, Fair Value [Line Items]
Notional Amount. Other Assets	$ 139,704	$ 99,665
Fair Value, Other Assets	6,239	3,168
Other assets | Forward commitments
Derivatives, Fair Value [Line Items]
Notional Amount. Other Assets	112,500	118,378
Fair Value, Other Assets	209	523
Other liabilities | Forward commitments
Derivatives, Fair Value [Line Items]
Notional Amount, Other Liabilities	285,248	136,709
Fair Value, Other Liabilities	(1,312)	(315)
Other liabilities | Undesignated interest rate swaps
Derivatives, Fair Value [Line Items]
Notional Amount, Other Liabilities	22,620	50,975
Fair Value, Other Liabilities	$ (1,944)	$ (3,677)