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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Derivatives - Schedule of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Derivatives Fair Value [Line Items]
Notional amount			$ 100,000
Not Designated As Hedging
Derivatives Fair Value [Line Items]
Notional amount	$ 1,533,001	$ 1,810,484
Asset	12,143	8,258
Liability	4,076	1,699
Not Designated As Hedging \| Interest rate contracts
Derivatives Fair Value [Line Items]
Notional amount	270,205	146,754
Asset	3,791	1,146
Liability	3,791	1,146
Not Designated As Hedging \| Forward commitments
Derivatives Fair Value [Line Items]
Notional amount	587,976	870,574
Asset	2,242
Liability		553
Not Designated As Hedging \| Interest rate-lock commitments
Derivatives Fair Value [Line Items]
Notional amount	452,820	504,156
Asset	6,079	6,768
Not Designated As Hedging \| Futures Contracts
Derivatives Fair Value [Line Items]
Notional amount	216,000	283,000
Asset		315
Liability	285
Not Designated As Hedging \| Option Contracts
Derivatives Fair Value [Line Items]
Notional amount	6,000	6,000
Asset	31	29
Designated as Hedging
Derivatives Fair Value [Line Items]
Notional amount	30,000	130,000
Asset	1,519	1,432
Designated as Hedging \| Interest Rate Swaps
Derivatives Fair Value [Line Items]
Notional amount	30,000	130,000
Asset	$ 1,519	$ 1,432