Derivatives - Schedule of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jul. 31, 2017
Derivatives, Fair Value [Line Items]
Notional Amount			$ 100,000
Net amounts presented in the consolidated balance sheets	$ 4,562	$ 331
Net amounts presented in the consolidated balance sheets	41,059	14,682
Not designated as hedging:
Derivatives, Fair Value [Line Items]
Notional Amount	3,138,839	1,967,191
Net amounts presented in the consolidated balance sheets	80,544	21,981
Net amounts presented in the consolidated balance sheets	47,854	17,418
Interest rate contracts | Not designated as hedging:
Derivatives, Fair Value [Line Items]
Notional Amount	541,983	440,556
Net amounts presented in the consolidated balance sheets	41,236	14,929
Net amounts presented in the consolidated balance sheets	41,068	14,929
Forward commitments | Not designated as hedging:
Derivatives, Fair Value [Line Items]
Notional Amount	1,142,224	684,437
Net amounts presented in the consolidated balance sheets	0	0
Net amounts presented in the consolidated balance sheets	6,786	866
Interest rate-lock commitments | Not designated as hedging:
Derivatives, Fair Value [Line Items]
Notional Amount	1,205,932	453,198
Net amounts presented in the consolidated balance sheets	37,055	7,052
Net amounts presented in the consolidated balance sheets	0	0
Futures contracts | Not designated as hedging:
Derivatives, Fair Value [Line Items]
Notional Amount	248,700	389,000
Net amounts presented in the consolidated balance sheets	2,253	0
Net amounts presented in the consolidated balance sheets	0	1,623
Interest rate swaps | Designated as hedging:
Derivatives, Fair Value [Line Items]
Notional Amount	30,000	30,000
Net amounts presented in the consolidated balance sheets	0	0
Net amounts presented in the consolidated balance sheets	$ 2,215	$ 515