Derivatives - Schedule of Gains (Losses) Included in the Condensed Consolidated Statements of Income Related to Derivative Financial Instruments (Details) - Derivatives Not Designated As Hedging Instruments - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Derivatives Fair Value [Line Items]
Gains (losses) on derivative financial instruments	$ (5,447)	$ (6,844)	$ (10,227)	$ (1,016)
Included in Mortgage Banking Income | Interest rate-lock commitments
Derivatives Fair Value [Line Items]
Gains (losses) on derivative financial instruments	(1,043)	2,321	10,922	4,626
Included in Mortgage Banking Income | Forward commitments
Derivatives Fair Value [Line Items]
Gains (losses) on derivative financial instruments	$ (4,404)	$ (9,165)	$ (21,149)	$ (5,642)