Derivatives - Schedule of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Jul. 31, 2017
Derivatives, Fair Value [Line Items]
Notional Amount			$ 100,000
Asset	$ 21,981	$ 14,316
Liability	17,933	11,637
Not designated as hedging:
Derivatives, Fair Value [Line Items]
Notional Amount	1,967,191	1,258,047
Asset	21,981	13,595
Liability	17,418	11,637
Interest rate contracts | Not designated as hedging:
Derivatives, Fair Value [Line Items]
Notional Amount	440,556	295,333
Asset	14,929	6,679
Liability	14,929	6,679
Forward commitments | Not designated as hedging:
Derivatives, Fair Value [Line Items]
Notional Amount	684,437	474,208
Asset	0	0
Liability	866	4,958
Interest rate-lock commitments | Not designated as hedging:
Derivatives, Fair Value [Line Items]
Notional Amount	453,198	318,706
Asset	7,052	6,241
Liability	0	0
Futures contracts | Not designated as hedging:
Derivatives, Fair Value [Line Items]
Notional Amount	389,000	166,000
Asset	0	649
Liability	1,623	0
Option contracts | Not designated as hedging:
Derivatives, Fair Value [Line Items]
Notional Amount	0	3,800
Asset	0	26
Liability	0	0
Interest rate swaps | Designated as hedging:
Derivatives, Fair Value [Line Items]
Notional Amount	30,000	30,000
Asset	0	721
Liability	$ 515	$ 0