Derivatives - Schedule of Gains (Losses) Included in the Consolidated Statements of Income Related to Derivative Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Derivatives Fair Value [Line Items]
Gains (losses) on derivative financial instruments	$ (5,361)	$ (3,325)	$ (5,739)	$ (4,810)
Derivatives Not Designated As Hedging Instruments | Included in Mortgage Banking Income | Interest rate-lock commitments
Derivatives Fair Value [Line Items]
Gains (losses) on derivative financial instruments	(1,433)	4,697	1,509	11,965
Derivatives Not Designated As Hedging Instruments | Included in Mortgage Banking Income | Forward commitments
Derivatives Fair Value [Line Items]
Gains (losses) on derivative financial instruments	$ (3,928)	$ (8,022)	$ (7,248)	$ (16,775)