Derivatives - Schedule of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Jul. 31, 2017
Derivatives, Fair Value [Line Items]
Notional Amount			$ 100,000
Not designated as hedging:
Derivatives, Fair Value [Line Items]
Notional Amount	$ 3,176,560	$ 1,967,191
Asset	66,281	21,981
Liability	64,633	17,418
Interest rate contracts | Not designated as hedging:
Derivatives, Fair Value [Line Items]
Notional Amount	526,360	440,556
Asset	38,767	14,929
Liability	38,722	14,929
Forward commitments | Not designated as hedging:
Derivatives, Fair Value [Line Items]
Notional Amount	1,171,167	684,437
Asset	0	0
Liability	23,363	866
Interest rate-lock commitments | Not designated as hedging:
Derivatives, Fair Value [Line Items]
Notional Amount	1,084,533	453,198
Asset	27,514	7,052
Liability	0	0
Futures contracts | Not designated as hedging:
Derivatives, Fair Value [Line Items]
Notional Amount	394,500	389,000
Asset	0	0
Liability	2,548	1,623
Interest rate swaps | Designated as hedging:
Derivatives, Fair Value [Line Items]
Notional Amount	30,000	30,000
Asset	0	0
Liability	$ 2,063	$ 515