Derivatives - Schedule of Gains (Losses) Included in the Consolidated Statements of Income Related to Derivative Financial Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Derivatives Fair Value [Line Items]
Gains (losses) on derivative financial instruments	$ 5,763	$ (1,527)	$ (6,494)
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	835	2,073	2,535
Derivatives Not Designated As Hedging Instruments | Included in Mortgage Banking Income | Forward commitments
Derivatives Fair Value [Line Items]
Gains (losses) on derivative financial instruments	10,497	$ (3,600)	$ (9,029)
Derivatives Designated As Hedging Instruments | Included in Loss on Sale of Mortgage Servicing Rights | Fair Value Hedge
Derivatives Fair Value [Line Items]
Gains (losses) on derivative financial instruments	$ (5,569)